1// SPDX-License-Identifier: GPL-2.0-only
   2/* binder.c
   3 *
   4 * Android IPC Subsystem
   5 *
   6 * Copyright (C) 2007-2008 Google, Inc.
   7 */
   8
   9/*
  10 * Locking overview
  11 *
  12 * There are 3 main spinlocks which must be acquired in the
  13 * order shown:
  14 *
  15 * 1) proc->outer_lock : protects binder_ref
  16 *    binder_proc_lock() and binder_proc_unlock() are
  17 *    used to acq/rel.
  18 * 2) node->lock : protects most fields of binder_node.
  19 *    binder_node_lock() and binder_node_unlock() are
  20 *    used to acq/rel
  21 * 3) proc->inner_lock : protects the thread and node lists
  22 *    (proc->threads, proc->waiting_threads, proc->nodes)
  23 *    and all todo lists associated with the binder_proc
  24 *    (proc->todo, thread->todo, proc->delivered_death and
  25 *    node->async_todo), as well as thread->transaction_stack
  26 *    binder_inner_proc_lock() and binder_inner_proc_unlock()
  27 *    are used to acq/rel
  28 *
  29 * Any lock under procA must never be nested under any lock at the same
  30 * level or below on procB.
  31 *
  32 * Functions that require a lock held on entry indicate which lock
  33 * in the suffix of the function name:
  34 *
  35 * foo_olocked() : requires node->outer_lock
  36 * foo_nlocked() : requires node->lock
  37 * foo_ilocked() : requires proc->inner_lock
  38 * foo_oilocked(): requires proc->outer_lock and proc->inner_lock
  39 * foo_nilocked(): requires node->lock and proc->inner_lock
  40 * ...
  41 */
  42
  43#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  44
  45#include <linux/fdtable.h>
  46#include <linux/file.h>
  47#include <linux/freezer.h>
  48#include <linux/fs.h>
  49#include <linux/list.h>
  50#include <linux/miscdevice.h>
  51#include <linux/module.h>
  52#include <linux/mutex.h>
  53#include <linux/nsproxy.h>
  54#include <linux/poll.h>
  55#include <linux/debugfs.h>
  56#include <linux/rbtree.h>
  57#include <linux/sched/signal.h>
  58#include <linux/sched/mm.h>
  59#include <linux/seq_file.h>
  60#include <linux/string.h>
  61#include <linux/uaccess.h>
  62#include <linux/pid_namespace.h>
  63#include <linux/security.h>
  64#include <linux/spinlock.h>
  65#include <linux/ratelimit.h>
  66#include <linux/syscalls.h>
  67#include <linux/task_work.h>
  68#include <linux/sizes.h>
  69#include <linux/ktime.h>
  70
  71#include <uapi/linux/android/binder.h>
 
  72
  73#include <linux/cacheflush.h>
  74
 
  75#include "binder_internal.h"
  76#include "binder_trace.h"
  77
  78static HLIST_HEAD(binder_deferred_list);
  79static DEFINE_MUTEX(binder_deferred_lock);
  80
  81static HLIST_HEAD(binder_devices);
  82static HLIST_HEAD(binder_procs);
  83static DEFINE_MUTEX(binder_procs_lock);
  84
  85static HLIST_HEAD(binder_dead_nodes);
  86static DEFINE_SPINLOCK(binder_dead_nodes_lock);
  87
  88static struct dentry *binder_debugfs_dir_entry_root;
  89static struct dentry *binder_debugfs_dir_entry_proc;
  90static atomic_t binder_last_id;
  91
  92static int proc_show(struct seq_file *m, void *unused);
  93DEFINE_SHOW_ATTRIBUTE(proc);
  94
 
 
 
 
 
  95#define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  96
  97enum {
  98	BINDER_DEBUG_USER_ERROR             = 1U << 0,
  99	BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
 100	BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
 101	BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
 102	BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
 103	BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
 104	BINDER_DEBUG_READ_WRITE             = 1U << 6,
 105	BINDER_DEBUG_USER_REFS              = 1U << 7,
 106	BINDER_DEBUG_THREADS                = 1U << 8,
 107	BINDER_DEBUG_TRANSACTION            = 1U << 9,
 108	BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
 109	BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
 110	BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
 111	BINDER_DEBUG_PRIORITY_CAP           = 1U << 13,
 112	BINDER_DEBUG_SPINLOCKS              = 1U << 14,
 113};
 114static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 115	BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 116module_param_named(debug_mask, binder_debug_mask, uint, 0644);
 117
 118char *binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES;
 119module_param_named(devices, binder_devices_param, charp, 0444);
 120
 121static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 122static int binder_stop_on_user_error;
 123
 124static int binder_set_stop_on_user_error(const char *val,
 125					 const struct kernel_param *kp)
 126{
 127	int ret;
 128
 129	ret = param_set_int(val, kp);
 130	if (binder_stop_on_user_error < 2)
 131		wake_up(&binder_user_error_wait);
 132	return ret;
 133}
 134module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 135	param_get_int, &binder_stop_on_user_error, 0644);
 136
 137static __printf(2, 3) void binder_debug(int mask, const char *format, ...)
 138{
 139	struct va_format vaf;
 140	va_list args;
 141
 142	if (binder_debug_mask & mask) {
 143		va_start(args, format);
 144		vaf.va = &args;
 145		vaf.fmt = format;
 146		pr_info_ratelimited("%pV", &vaf);
 147		va_end(args);
 148	}
 149}
 150
 151#define binder_txn_error(x...) \
 152	binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, x)
 153
 154static __printf(1, 2) void binder_user_error(const char *format, ...)
 155{
 156	struct va_format vaf;
 157	va_list args;
 158
 159	if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) {
 160		va_start(args, format);
 161		vaf.va = &args;
 162		vaf.fmt = format;
 163		pr_info_ratelimited("%pV", &vaf);
 164		va_end(args);
 165	}
 166
 167	if (binder_stop_on_user_error)
 168		binder_stop_on_user_error = 2;
 169}
 170
 171#define binder_set_extended_error(ee, _id, _command, _param) \
 172	do { \
 173		(ee)->id = _id; \
 174		(ee)->command = _command; \
 175		(ee)->param = _param; \
 
 176	} while (0)
 177
 178#define to_flat_binder_object(hdr) \
 179	container_of(hdr, struct flat_binder_object, hdr)
 180
 181#define to_binder_fd_object(hdr) container_of(hdr, struct binder_fd_object, hdr)
 182
 183#define to_binder_buffer_object(hdr) \
 184	container_of(hdr, struct binder_buffer_object, hdr)
 185
 186#define to_binder_fd_array_object(hdr) \
 187	container_of(hdr, struct binder_fd_array_object, hdr)
 188
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 189static struct binder_stats binder_stats;
 190
 191static inline void binder_stats_deleted(enum binder_stat_types type)
 192{
 193	atomic_inc(&binder_stats.obj_deleted[type]);
 194}
 195
 196static inline void binder_stats_created(enum binder_stat_types type)
 197{
 198	atomic_inc(&binder_stats.obj_created[type]);
 199}
 200
 201struct binder_transaction_log_entry {
 202	int debug_id;
 203	int debug_id_done;
 204	int call_type;
 205	int from_proc;
 206	int from_thread;
 207	int target_handle;
 208	int to_proc;
 209	int to_thread;
 210	int to_node;
 211	int data_size;
 212	int offsets_size;
 213	int return_error_line;
 214	uint32_t return_error;
 215	uint32_t return_error_param;
 216	char context_name[BINDERFS_MAX_NAME + 1];
 217};
 218
 219struct binder_transaction_log {
 220	atomic_t cur;
 221	bool full;
 222	struct binder_transaction_log_entry entry[32];
 223};
 224
 225static struct binder_transaction_log binder_transaction_log;
 226static struct binder_transaction_log binder_transaction_log_failed;
 227
 228static struct binder_transaction_log_entry *binder_transaction_log_add(
 229	struct binder_transaction_log *log)
 230{
 231	struct binder_transaction_log_entry *e;
 232	unsigned int cur = atomic_inc_return(&log->cur);
 233
 234	if (cur >= ARRAY_SIZE(log->entry))
 235		log->full = true;
 236	e = &log->entry[cur % ARRAY_SIZE(log->entry)];
 237	WRITE_ONCE(e->debug_id_done, 0);
 238	/*
 239	 * write-barrier to synchronize access to e->debug_id_done.
 240	 * We make sure the initialized 0 value is seen before
 241	 * memset() other fields are zeroed by memset.
 242	 */
 243	smp_wmb();
 244	memset(e, 0, sizeof(*e));
 245	return e;
 246}
 247
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 248enum binder_deferred_state {
 249	BINDER_DEFERRED_FLUSH        = 0x01,
 250	BINDER_DEFERRED_RELEASE      = 0x02,
 251};
 252
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 253enum {
 254	BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 255	BINDER_LOOPER_STATE_ENTERED     = 0x02,
 256	BINDER_LOOPER_STATE_EXITED      = 0x04,
 257	BINDER_LOOPER_STATE_INVALID     = 0x08,
 258	BINDER_LOOPER_STATE_WAITING     = 0x10,
 259	BINDER_LOOPER_STATE_POLL        = 0x20,
 260};
 261
 262/**
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 263 * binder_proc_lock() - Acquire outer lock for given binder_proc
 264 * @proc:         struct binder_proc to acquire
 265 *
 266 * Acquires proc->outer_lock. Used to protect binder_ref
 267 * structures associated with the given proc.
 268 */
 269#define binder_proc_lock(proc) _binder_proc_lock(proc, __LINE__)
 270static void
 271_binder_proc_lock(struct binder_proc *proc, int line)
 272	__acquires(&proc->outer_lock)
 273{
 274	binder_debug(BINDER_DEBUG_SPINLOCKS,
 275		     "%s: line=%d\n", __func__, line);
 276	spin_lock(&proc->outer_lock);
 277}
 278
 279/**
 280 * binder_proc_unlock() - Release spinlock for given binder_proc
 281 * @proc:                struct binder_proc to acquire
 282 *
 283 * Release lock acquired via binder_proc_lock()
 284 */
 285#define binder_proc_unlock(proc) _binder_proc_unlock(proc, __LINE__)
 286static void
 287_binder_proc_unlock(struct binder_proc *proc, int line)
 288	__releases(&proc->outer_lock)
 289{
 290	binder_debug(BINDER_DEBUG_SPINLOCKS,
 291		     "%s: line=%d\n", __func__, line);
 292	spin_unlock(&proc->outer_lock);
 293}
 294
 295/**
 296 * binder_inner_proc_lock() - Acquire inner lock for given binder_proc
 297 * @proc:         struct binder_proc to acquire
 298 *
 299 * Acquires proc->inner_lock. Used to protect todo lists
 300 */
 301#define binder_inner_proc_lock(proc) _binder_inner_proc_lock(proc, __LINE__)
 302static void
 303_binder_inner_proc_lock(struct binder_proc *proc, int line)
 304	__acquires(&proc->inner_lock)
 305{
 306	binder_debug(BINDER_DEBUG_SPINLOCKS,
 307		     "%s: line=%d\n", __func__, line);
 308	spin_lock(&proc->inner_lock);
 309}
 310
 311/**
 312 * binder_inner_proc_unlock() - Release inner lock for given binder_proc
 313 * @proc:         struct binder_proc to acquire
 314 *
 315 * Release lock acquired via binder_inner_proc_lock()
 316 */
 317#define binder_inner_proc_unlock(proc) _binder_inner_proc_unlock(proc, __LINE__)
 318static void
 319_binder_inner_proc_unlock(struct binder_proc *proc, int line)
 320	__releases(&proc->inner_lock)
 321{
 322	binder_debug(BINDER_DEBUG_SPINLOCKS,
 323		     "%s: line=%d\n", __func__, line);
 324	spin_unlock(&proc->inner_lock);
 325}
 326
 327/**
 328 * binder_node_lock() - Acquire spinlock for given binder_node
 329 * @node:         struct binder_node to acquire
 330 *
 331 * Acquires node->lock. Used to protect binder_node fields
 332 */
 333#define binder_node_lock(node) _binder_node_lock(node, __LINE__)
 334static void
 335_binder_node_lock(struct binder_node *node, int line)
 336	__acquires(&node->lock)
 337{
 338	binder_debug(BINDER_DEBUG_SPINLOCKS,
 339		     "%s: line=%d\n", __func__, line);
 340	spin_lock(&node->lock);
 341}
 342
 343/**
 344 * binder_node_unlock() - Release spinlock for given binder_proc
 345 * @node:         struct binder_node to acquire
 346 *
 347 * Release lock acquired via binder_node_lock()
 348 */
 349#define binder_node_unlock(node) _binder_node_unlock(node, __LINE__)
 350static void
 351_binder_node_unlock(struct binder_node *node, int line)
 352	__releases(&node->lock)
 353{
 354	binder_debug(BINDER_DEBUG_SPINLOCKS,
 355		     "%s: line=%d\n", __func__, line);
 356	spin_unlock(&node->lock);
 357}
 358
 359/**
 360 * binder_node_inner_lock() - Acquire node and inner locks
 361 * @node:         struct binder_node to acquire
 362 *
 363 * Acquires node->lock. If node->proc also acquires
 364 * proc->inner_lock. Used to protect binder_node fields
 365 */
 366#define binder_node_inner_lock(node) _binder_node_inner_lock(node, __LINE__)
 367static void
 368_binder_node_inner_lock(struct binder_node *node, int line)
 369	__acquires(&node->lock) __acquires(&node->proc->inner_lock)
 370{
 371	binder_debug(BINDER_DEBUG_SPINLOCKS,
 372		     "%s: line=%d\n", __func__, line);
 373	spin_lock(&node->lock);
 374	if (node->proc)
 375		binder_inner_proc_lock(node->proc);
 376	else
 377		/* annotation for sparse */
 378		__acquire(&node->proc->inner_lock);
 379}
 380
 381/**
 382 * binder_node_inner_unlock() - Release node and inner locks
 383 * @node:         struct binder_node to acquire
 384 *
 385 * Release lock acquired via binder_node_lock()
 386 */
 387#define binder_node_inner_unlock(node) _binder_node_inner_unlock(node, __LINE__)
 388static void
 389_binder_node_inner_unlock(struct binder_node *node, int line)
 390	__releases(&node->lock) __releases(&node->proc->inner_lock)
 391{
 392	struct binder_proc *proc = node->proc;
 393
 394	binder_debug(BINDER_DEBUG_SPINLOCKS,
 395		     "%s: line=%d\n", __func__, line);
 396	if (proc)
 397		binder_inner_proc_unlock(proc);
 398	else
 399		/* annotation for sparse */
 400		__release(&node->proc->inner_lock);
 401	spin_unlock(&node->lock);
 402}
 403
 404static bool binder_worklist_empty_ilocked(struct list_head *list)
 405{
 406	return list_empty(list);
 407}
 408
 409/**
 410 * binder_worklist_empty() - Check if no items on the work list
 411 * @proc:       binder_proc associated with list
 412 * @list:	list to check
 413 *
 414 * Return: true if there are no items on list, else false
 415 */
 416static bool binder_worklist_empty(struct binder_proc *proc,
 417				  struct list_head *list)
 418{
 419	bool ret;
 420
 421	binder_inner_proc_lock(proc);
 422	ret = binder_worklist_empty_ilocked(list);
 423	binder_inner_proc_unlock(proc);
 424	return ret;
 425}
 426
 427/**
 428 * binder_enqueue_work_ilocked() - Add an item to the work list
 429 * @work:         struct binder_work to add to list
 430 * @target_list:  list to add work to
 431 *
 432 * Adds the work to the specified list. Asserts that work
 433 * is not already on a list.
 434 *
 435 * Requires the proc->inner_lock to be held.
 436 */
 437static void
 438binder_enqueue_work_ilocked(struct binder_work *work,
 439			   struct list_head *target_list)
 440{
 441	BUG_ON(target_list == NULL);
 442	BUG_ON(work->entry.next && !list_empty(&work->entry));
 443	list_add_tail(&work->entry, target_list);
 444}
 445
 446/**
 447 * binder_enqueue_deferred_thread_work_ilocked() - Add deferred thread work
 448 * @thread:       thread to queue work to
 449 * @work:         struct binder_work to add to list
 450 *
 451 * Adds the work to the todo list of the thread. Doesn't set the process_todo
 452 * flag, which means that (if it wasn't already set) the thread will go to
 453 * sleep without handling this work when it calls read.
 454 *
 455 * Requires the proc->inner_lock to be held.
 456 */
 457static void
 458binder_enqueue_deferred_thread_work_ilocked(struct binder_thread *thread,
 459					    struct binder_work *work)
 460{
 461	WARN_ON(!list_empty(&thread->waiting_thread_node));
 462	binder_enqueue_work_ilocked(work, &thread->todo);
 463}
 464
 465/**
 466 * binder_enqueue_thread_work_ilocked() - Add an item to the thread work list
 467 * @thread:       thread to queue work to
 468 * @work:         struct binder_work to add to list
 469 *
 470 * Adds the work to the todo list of the thread, and enables processing
 471 * of the todo queue.
 472 *
 473 * Requires the proc->inner_lock to be held.
 474 */
 475static void
 476binder_enqueue_thread_work_ilocked(struct binder_thread *thread,
 477				   struct binder_work *work)
 478{
 479	WARN_ON(!list_empty(&thread->waiting_thread_node));
 480	binder_enqueue_work_ilocked(work, &thread->todo);
 481
 482	/* (e)poll-based threads require an explicit wakeup signal when
 483	 * queuing their own work; they rely on these events to consume
 484	 * messages without I/O block. Without it, threads risk waiting
 485	 * indefinitely without handling the work.
 486	 */
 487	if (thread->looper & BINDER_LOOPER_STATE_POLL &&
 488	    thread->pid == current->pid && !thread->process_todo)
 489		wake_up_interruptible_sync(&thread->wait);
 490
 491	thread->process_todo = true;
 492}
 493
 494/**
 495 * binder_enqueue_thread_work() - Add an item to the thread work list
 496 * @thread:       thread to queue work to
 497 * @work:         struct binder_work to add to list
 498 *
 499 * Adds the work to the todo list of the thread, and enables processing
 500 * of the todo queue.
 501 */
 502static void
 503binder_enqueue_thread_work(struct binder_thread *thread,
 504			   struct binder_work *work)
 505{
 506	binder_inner_proc_lock(thread->proc);
 507	binder_enqueue_thread_work_ilocked(thread, work);
 508	binder_inner_proc_unlock(thread->proc);
 509}
 510
 511static void
 512binder_dequeue_work_ilocked(struct binder_work *work)
 513{
 514	list_del_init(&work->entry);
 515}
 516
 517/**
 518 * binder_dequeue_work() - Removes an item from the work list
 519 * @proc:         binder_proc associated with list
 520 * @work:         struct binder_work to remove from list
 521 *
 522 * Removes the specified work item from whatever list it is on.
 523 * Can safely be called if work is not on any list.
 524 */
 525static void
 526binder_dequeue_work(struct binder_proc *proc, struct binder_work *work)
 527{
 528	binder_inner_proc_lock(proc);
 529	binder_dequeue_work_ilocked(work);
 530	binder_inner_proc_unlock(proc);
 531}
 532
 533static struct binder_work *binder_dequeue_work_head_ilocked(
 534					struct list_head *list)
 535{
 536	struct binder_work *w;
 537
 538	w = list_first_entry_or_null(list, struct binder_work, entry);
 539	if (w)
 540		list_del_init(&w->entry);
 541	return w;
 542}
 543
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 544static void
 545binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 546static void binder_free_thread(struct binder_thread *thread);
 547static void binder_free_proc(struct binder_proc *proc);
 548static void binder_inc_node_tmpref_ilocked(struct binder_node *node);
 549
 550static bool binder_has_work_ilocked(struct binder_thread *thread,
 551				    bool do_proc_work)
 552{
 553	return thread->process_todo ||
 554		thread->looper_need_return ||
 555		(do_proc_work &&
 556		 !binder_worklist_empty_ilocked(&thread->proc->todo));
 557}
 558
 559static bool binder_has_work(struct binder_thread *thread, bool do_proc_work)
 560{
 561	bool has_work;
 562
 563	binder_inner_proc_lock(thread->proc);
 564	has_work = binder_has_work_ilocked(thread, do_proc_work);
 565	binder_inner_proc_unlock(thread->proc);
 566
 567	return has_work;
 568}
 569
 570static bool binder_available_for_proc_work_ilocked(struct binder_thread *thread)
 571{
 572	return !thread->transaction_stack &&
 573		binder_worklist_empty_ilocked(&thread->todo) &&
 574		(thread->looper & (BINDER_LOOPER_STATE_ENTERED |
 575				   BINDER_LOOPER_STATE_REGISTERED));
 576}
 577
 578static void binder_wakeup_poll_threads_ilocked(struct binder_proc *proc,
 579					       bool sync)
 580{
 581	struct rb_node *n;
 582	struct binder_thread *thread;
 583
 584	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
 585		thread = rb_entry(n, struct binder_thread, rb_node);
 586		if (thread->looper & BINDER_LOOPER_STATE_POLL &&
 587		    binder_available_for_proc_work_ilocked(thread)) {
 588			if (sync)
 589				wake_up_interruptible_sync(&thread->wait);
 590			else
 591				wake_up_interruptible(&thread->wait);
 592		}
 593	}
 594}
 595
 596/**
 597 * binder_select_thread_ilocked() - selects a thread for doing proc work.
 598 * @proc:	process to select a thread from
 599 *
 600 * Note that calling this function moves the thread off the waiting_threads
 601 * list, so it can only be woken up by the caller of this function, or a
 602 * signal. Therefore, callers *should* always wake up the thread this function
 603 * returns.
 604 *
 605 * Return:	If there's a thread currently waiting for process work,
 606 *		returns that thread. Otherwise returns NULL.
 607 */
 608static struct binder_thread *
 609binder_select_thread_ilocked(struct binder_proc *proc)
 610{
 611	struct binder_thread *thread;
 612
 613	assert_spin_locked(&proc->inner_lock);
 614	thread = list_first_entry_or_null(&proc->waiting_threads,
 615					  struct binder_thread,
 616					  waiting_thread_node);
 617
 618	if (thread)
 619		list_del_init(&thread->waiting_thread_node);
 620
 621	return thread;
 622}
 623
 624/**
 625 * binder_wakeup_thread_ilocked() - wakes up a thread for doing proc work.
 626 * @proc:	process to wake up a thread in
 627 * @thread:	specific thread to wake-up (may be NULL)
 628 * @sync:	whether to do a synchronous wake-up
 629 *
 630 * This function wakes up a thread in the @proc process.
 631 * The caller may provide a specific thread to wake-up in
 632 * the @thread parameter. If @thread is NULL, this function
 633 * will wake up threads that have called poll().
 634 *
 635 * Note that for this function to work as expected, callers
 636 * should first call binder_select_thread() to find a thread
 637 * to handle the work (if they don't have a thread already),
 638 * and pass the result into the @thread parameter.
 639 */
 640static void binder_wakeup_thread_ilocked(struct binder_proc *proc,
 641					 struct binder_thread *thread,
 642					 bool sync)
 643{
 644	assert_spin_locked(&proc->inner_lock);
 645
 646	if (thread) {
 647		if (sync)
 648			wake_up_interruptible_sync(&thread->wait);
 649		else
 650			wake_up_interruptible(&thread->wait);
 651		return;
 652	}
 653
 654	/* Didn't find a thread waiting for proc work; this can happen
 655	 * in two scenarios:
 656	 * 1. All threads are busy handling transactions
 657	 *    In that case, one of those threads should call back into
 658	 *    the kernel driver soon and pick up this work.
 659	 * 2. Threads are using the (e)poll interface, in which case
 660	 *    they may be blocked on the waitqueue without having been
 661	 *    added to waiting_threads. For this case, we just iterate
 662	 *    over all threads not handling transaction work, and
 663	 *    wake them all up. We wake all because we don't know whether
 664	 *    a thread that called into (e)poll is handling non-binder
 665	 *    work currently.
 666	 */
 667	binder_wakeup_poll_threads_ilocked(proc, sync);
 668}
 669
 670static void binder_wakeup_proc_ilocked(struct binder_proc *proc)
 671{
 672	struct binder_thread *thread = binder_select_thread_ilocked(proc);
 673
 674	binder_wakeup_thread_ilocked(proc, thread, /* sync = */false);
 675}
 676
 677static void binder_set_nice(long nice)
 678{
 679	long min_nice;
 680
 681	if (can_nice(current, nice)) {
 682		set_user_nice(current, nice);
 683		return;
 684	}
 685	min_nice = rlimit_to_nice(rlimit(RLIMIT_NICE));
 686	binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 687		     "%d: nice value %ld not allowed use %ld instead\n",
 688		      current->pid, nice, min_nice);
 689	set_user_nice(current, min_nice);
 690	if (min_nice <= MAX_NICE)
 691		return;
 692	binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
 693}
 694
 695static struct binder_node *binder_get_node_ilocked(struct binder_proc *proc,
 696						   binder_uintptr_t ptr)
 697{
 698	struct rb_node *n = proc->nodes.rb_node;
 699	struct binder_node *node;
 700
 701	assert_spin_locked(&proc->inner_lock);
 702
 703	while (n) {
 704		node = rb_entry(n, struct binder_node, rb_node);
 705
 706		if (ptr < node->ptr)
 707			n = n->rb_left;
 708		else if (ptr > node->ptr)
 709			n = n->rb_right;
 710		else {
 711			/*
 712			 * take an implicit weak reference
 713			 * to ensure node stays alive until
 714			 * call to binder_put_node()
 715			 */
 716			binder_inc_node_tmpref_ilocked(node);
 717			return node;
 718		}
 719	}
 720	return NULL;
 721}
 722
 723static struct binder_node *binder_get_node(struct binder_proc *proc,
 724					   binder_uintptr_t ptr)
 725{
 726	struct binder_node *node;
 727
 728	binder_inner_proc_lock(proc);
 729	node = binder_get_node_ilocked(proc, ptr);
 730	binder_inner_proc_unlock(proc);
 731	return node;
 732}
 733
 734static struct binder_node *binder_init_node_ilocked(
 735						struct binder_proc *proc,
 736						struct binder_node *new_node,
 737						struct flat_binder_object *fp)
 738{
 739	struct rb_node **p = &proc->nodes.rb_node;
 740	struct rb_node *parent = NULL;
 741	struct binder_node *node;
 742	binder_uintptr_t ptr = fp ? fp->binder : 0;
 743	binder_uintptr_t cookie = fp ? fp->cookie : 0;
 744	__u32 flags = fp ? fp->flags : 0;
 745
 746	assert_spin_locked(&proc->inner_lock);
 747
 748	while (*p) {
 749
 750		parent = *p;
 751		node = rb_entry(parent, struct binder_node, rb_node);
 752
 753		if (ptr < node->ptr)
 754			p = &(*p)->rb_left;
 755		else if (ptr > node->ptr)
 756			p = &(*p)->rb_right;
 757		else {
 758			/*
 759			 * A matching node is already in
 760			 * the rb tree. Abandon the init
 761			 * and return it.
 762			 */
 763			binder_inc_node_tmpref_ilocked(node);
 764			return node;
 765		}
 766	}
 767	node = new_node;
 768	binder_stats_created(BINDER_STAT_NODE);
 769	node->tmp_refs++;
 770	rb_link_node(&node->rb_node, parent, p);
 771	rb_insert_color(&node->rb_node, &proc->nodes);
 772	node->debug_id = atomic_inc_return(&binder_last_id);
 773	node->proc = proc;
 774	node->ptr = ptr;
 775	node->cookie = cookie;
 776	node->work.type = BINDER_WORK_NODE;
 777	node->min_priority = flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
 778	node->accept_fds = !!(flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
 779	node->txn_security_ctx = !!(flags & FLAT_BINDER_FLAG_TXN_SECURITY_CTX);
 780	spin_lock_init(&node->lock);
 781	INIT_LIST_HEAD(&node->work.entry);
 782	INIT_LIST_HEAD(&node->async_todo);
 783	binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 784		     "%d:%d node %d u%016llx c%016llx created\n",
 785		     proc->pid, current->pid, node->debug_id,
 786		     (u64)node->ptr, (u64)node->cookie);
 787
 788	return node;
 789}
 790
 791static struct binder_node *binder_new_node(struct binder_proc *proc,
 792					   struct flat_binder_object *fp)
 793{
 794	struct binder_node *node;
 795	struct binder_node *new_node = kzalloc(sizeof(*node), GFP_KERNEL);
 796
 797	if (!new_node)
 798		return NULL;
 799	binder_inner_proc_lock(proc);
 800	node = binder_init_node_ilocked(proc, new_node, fp);
 801	binder_inner_proc_unlock(proc);
 802	if (node != new_node)
 803		/*
 804		 * The node was already added by another thread
 805		 */
 806		kfree(new_node);
 807
 808	return node;
 809}
 810
 811static void binder_free_node(struct binder_node *node)
 812{
 813	kfree(node);
 814	binder_stats_deleted(BINDER_STAT_NODE);
 815}
 816
 817static int binder_inc_node_nilocked(struct binder_node *node, int strong,
 818				    int internal,
 819				    struct list_head *target_list)
 820{
 821	struct binder_proc *proc = node->proc;
 822
 823	assert_spin_locked(&node->lock);
 824	if (proc)
 825		assert_spin_locked(&proc->inner_lock);
 826	if (strong) {
 827		if (internal) {
 828			if (target_list == NULL &&
 829			    node->internal_strong_refs == 0 &&
 830			    !(node->proc &&
 831			      node == node->proc->context->binder_context_mgr_node &&
 832			      node->has_strong_ref)) {
 833				pr_err("invalid inc strong node for %d\n",
 834					node->debug_id);
 835				return -EINVAL;
 836			}
 837			node->internal_strong_refs++;
 838		} else
 839			node->local_strong_refs++;
 840		if (!node->has_strong_ref && target_list) {
 841			struct binder_thread *thread = container_of(target_list,
 842						    struct binder_thread, todo);
 843			binder_dequeue_work_ilocked(&node->work);
 844			BUG_ON(&thread->todo != target_list);
 845			binder_enqueue_deferred_thread_work_ilocked(thread,
 846								   &node->work);
 847		}
 848	} else {
 849		if (!internal)
 850			node->local_weak_refs++;
 851		if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 852			if (target_list == NULL) {
 853				pr_err("invalid inc weak node for %d\n",
 854					node->debug_id);
 855				return -EINVAL;
 856			}
 857			/*
 858			 * See comment above
 859			 */
 860			binder_enqueue_work_ilocked(&node->work, target_list);
 861		}
 862	}
 863	return 0;
 864}
 865
 866static int binder_inc_node(struct binder_node *node, int strong, int internal,
 867			   struct list_head *target_list)
 868{
 869	int ret;
 870
 871	binder_node_inner_lock(node);
 872	ret = binder_inc_node_nilocked(node, strong, internal, target_list);
 873	binder_node_inner_unlock(node);
 874
 875	return ret;
 876}
 877
 878static bool binder_dec_node_nilocked(struct binder_node *node,
 879				     int strong, int internal)
 880{
 881	struct binder_proc *proc = node->proc;
 882
 883	assert_spin_locked(&node->lock);
 884	if (proc)
 885		assert_spin_locked(&proc->inner_lock);
 886	if (strong) {
 887		if (internal)
 888			node->internal_strong_refs--;
 889		else
 890			node->local_strong_refs--;
 891		if (node->local_strong_refs || node->internal_strong_refs)
 892			return false;
 893	} else {
 894		if (!internal)
 895			node->local_weak_refs--;
 896		if (node->local_weak_refs || node->tmp_refs ||
 897				!hlist_empty(&node->refs))
 898			return false;
 899	}
 900
 901	if (proc && (node->has_strong_ref || node->has_weak_ref)) {
 902		if (list_empty(&node->work.entry)) {
 903			binder_enqueue_work_ilocked(&node->work, &proc->todo);
 904			binder_wakeup_proc_ilocked(proc);
 905		}
 906	} else {
 907		if (hlist_empty(&node->refs) && !node->local_strong_refs &&
 908		    !node->local_weak_refs && !node->tmp_refs) {
 909			if (proc) {
 910				binder_dequeue_work_ilocked(&node->work);
 911				rb_erase(&node->rb_node, &proc->nodes);
 912				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 913					     "refless node %d deleted\n",
 914					     node->debug_id);
 915			} else {
 916				BUG_ON(!list_empty(&node->work.entry));
 917				spin_lock(&binder_dead_nodes_lock);
 918				/*
 919				 * tmp_refs could have changed so
 920				 * check it again
 921				 */
 922				if (node->tmp_refs) {
 923					spin_unlock(&binder_dead_nodes_lock);
 924					return false;
 925				}
 926				hlist_del(&node->dead_node);
 927				spin_unlock(&binder_dead_nodes_lock);
 928				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 929					     "dead node %d deleted\n",
 930					     node->debug_id);
 931			}
 932			return true;
 933		}
 934	}
 935	return false;
 936}
 937
 938static void binder_dec_node(struct binder_node *node, int strong, int internal)
 939{
 940	bool free_node;
 941
 942	binder_node_inner_lock(node);
 943	free_node = binder_dec_node_nilocked(node, strong, internal);
 944	binder_node_inner_unlock(node);
 945	if (free_node)
 946		binder_free_node(node);
 947}
 948
 949static void binder_inc_node_tmpref_ilocked(struct binder_node *node)
 950{
 951	/*
 952	 * No call to binder_inc_node() is needed since we
 953	 * don't need to inform userspace of any changes to
 954	 * tmp_refs
 955	 */
 956	node->tmp_refs++;
 957}
 958
 959/**
 960 * binder_inc_node_tmpref() - take a temporary reference on node
 961 * @node:	node to reference
 962 *
 963 * Take reference on node to prevent the node from being freed
 964 * while referenced only by a local variable. The inner lock is
 965 * needed to serialize with the node work on the queue (which
 966 * isn't needed after the node is dead). If the node is dead
 967 * (node->proc is NULL), use binder_dead_nodes_lock to protect
 968 * node->tmp_refs against dead-node-only cases where the node
 969 * lock cannot be acquired (eg traversing the dead node list to
 970 * print nodes)
 971 */
 972static void binder_inc_node_tmpref(struct binder_node *node)
 973{
 974	binder_node_lock(node);
 975	if (node->proc)
 976		binder_inner_proc_lock(node->proc);
 977	else
 978		spin_lock(&binder_dead_nodes_lock);
 979	binder_inc_node_tmpref_ilocked(node);
 980	if (node->proc)
 981		binder_inner_proc_unlock(node->proc);
 982	else
 983		spin_unlock(&binder_dead_nodes_lock);
 984	binder_node_unlock(node);
 985}
 986
 987/**
 988 * binder_dec_node_tmpref() - remove a temporary reference on node
 989 * @node:	node to reference
 990 *
 991 * Release temporary reference on node taken via binder_inc_node_tmpref()
 992 */
 993static void binder_dec_node_tmpref(struct binder_node *node)
 994{
 995	bool free_node;
 996
 997	binder_node_inner_lock(node);
 998	if (!node->proc)
 999		spin_lock(&binder_dead_nodes_lock);
1000	else
1001		__acquire(&binder_dead_nodes_lock);
1002	node->tmp_refs--;
1003	BUG_ON(node->tmp_refs < 0);
1004	if (!node->proc)
1005		spin_unlock(&binder_dead_nodes_lock);
1006	else
1007		__release(&binder_dead_nodes_lock);
1008	/*
1009	 * Call binder_dec_node() to check if all refcounts are 0
1010	 * and cleanup is needed. Calling with strong=0 and internal=1
1011	 * causes no actual reference to be released in binder_dec_node().
1012	 * If that changes, a change is needed here too.
1013	 */
1014	free_node = binder_dec_node_nilocked(node, 0, 1);
1015	binder_node_inner_unlock(node);
1016	if (free_node)
1017		binder_free_node(node);
1018}
1019
1020static void binder_put_node(struct binder_node *node)
1021{
1022	binder_dec_node_tmpref(node);
1023}
1024
1025static struct binder_ref *binder_get_ref_olocked(struct binder_proc *proc,
1026						 u32 desc, bool need_strong_ref)
1027{
1028	struct rb_node *n = proc->refs_by_desc.rb_node;
1029	struct binder_ref *ref;
1030
1031	while (n) {
1032		ref = rb_entry(n, struct binder_ref, rb_node_desc);
1033
1034		if (desc < ref->data.desc) {
1035			n = n->rb_left;
1036		} else if (desc > ref->data.desc) {
1037			n = n->rb_right;
1038		} else if (need_strong_ref && !ref->data.strong) {
1039			binder_user_error("tried to use weak ref as strong ref\n");
1040			return NULL;
1041		} else {
1042			return ref;
1043		}
1044	}
1045	return NULL;
1046}
1047
1048/**
1049 * binder_get_ref_for_node_olocked() - get the ref associated with given node
1050 * @proc:	binder_proc that owns the ref
1051 * @node:	binder_node of target
1052 * @new_ref:	newly allocated binder_ref to be initialized or %NULL
1053 *
1054 * Look up the ref for the given node and return it if it exists
1055 *
1056 * If it doesn't exist and the caller provides a newly allocated
1057 * ref, initialize the fields of the newly allocated ref and insert
1058 * into the given proc rb_trees and node refs list.
1059 *
1060 * Return:	the ref for node. It is possible that another thread
1061 *		allocated/initialized the ref first in which case the
1062 *		returned ref would be different than the passed-in
1063 *		new_ref. new_ref must be kfree'd by the caller in
1064 *		this case.
1065 */
1066static struct binder_ref *binder_get_ref_for_node_olocked(
1067					struct binder_proc *proc,
1068					struct binder_node *node,
1069					struct binder_ref *new_ref)
1070{
1071	struct binder_context *context = proc->context;
1072	struct rb_node **p = &proc->refs_by_node.rb_node;
1073	struct rb_node *parent = NULL;
1074	struct binder_ref *ref;
1075	struct rb_node *n;
1076
1077	while (*p) {
1078		parent = *p;
1079		ref = rb_entry(parent, struct binder_ref, rb_node_node);
1080
1081		if (node < ref->node)
1082			p = &(*p)->rb_left;
1083		else if (node > ref->node)
1084			p = &(*p)->rb_right;
1085		else
1086			return ref;
1087	}
1088	if (!new_ref)
1089		return NULL;
1090
1091	binder_stats_created(BINDER_STAT_REF);
1092	new_ref->data.debug_id = atomic_inc_return(&binder_last_id);
1093	new_ref->proc = proc;
1094	new_ref->node = node;
1095	rb_link_node(&new_ref->rb_node_node, parent, p);
1096	rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1097
1098	new_ref->data.desc = (node == context->binder_context_mgr_node) ? 0 : 1;
1099	for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1100		ref = rb_entry(n, struct binder_ref, rb_node_desc);
1101		if (ref->data.desc > new_ref->data.desc)
1102			break;
1103		new_ref->data.desc = ref->data.desc + 1;
1104	}
1105
1106	p = &proc->refs_by_desc.rb_node;
1107	while (*p) {
1108		parent = *p;
1109		ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1110
1111		if (new_ref->data.desc < ref->data.desc)
1112			p = &(*p)->rb_left;
1113		else if (new_ref->data.desc > ref->data.desc)
1114			p = &(*p)->rb_right;
1115		else
1116			BUG();
1117	}
1118	rb_link_node(&new_ref->rb_node_desc, parent, p);
1119	rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1120
1121	binder_node_lock(node);
1122	hlist_add_head(&new_ref->node_entry, &node->refs);
1123
1124	binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1125		     "%d new ref %d desc %d for node %d\n",
1126		      proc->pid, new_ref->data.debug_id, new_ref->data.desc,
1127		      node->debug_id);
1128	binder_node_unlock(node);
1129	return new_ref;
1130}
1131
1132static void binder_cleanup_ref_olocked(struct binder_ref *ref)
1133{
1134	bool delete_node = false;
1135
1136	binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1137		     "%d delete ref %d desc %d for node %d\n",
1138		      ref->proc->pid, ref->data.debug_id, ref->data.desc,
1139		      ref->node->debug_id);
1140
1141	rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1142	rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1143
1144	binder_node_inner_lock(ref->node);
1145	if (ref->data.strong)
1146		binder_dec_node_nilocked(ref->node, 1, 1);
1147
1148	hlist_del(&ref->node_entry);
1149	delete_node = binder_dec_node_nilocked(ref->node, 0, 1);
1150	binder_node_inner_unlock(ref->node);
1151	/*
1152	 * Clear ref->node unless we want the caller to free the node
1153	 */
1154	if (!delete_node) {
1155		/*
1156		 * The caller uses ref->node to determine
1157		 * whether the node needs to be freed. Clear
1158		 * it since the node is still alive.
1159		 */
1160		ref->node = NULL;
1161	}
1162
1163	if (ref->death) {
1164		binder_debug(BINDER_DEBUG_DEAD_BINDER,
1165			     "%d delete ref %d desc %d has death notification\n",
1166			      ref->proc->pid, ref->data.debug_id,
1167			      ref->data.desc);
1168		binder_dequeue_work(ref->proc, &ref->death->work);
1169		binder_stats_deleted(BINDER_STAT_DEATH);
1170	}
1171	binder_stats_deleted(BINDER_STAT_REF);
1172}
1173
1174/**
1175 * binder_inc_ref_olocked() - increment the ref for given handle
1176 * @ref:         ref to be incremented
1177 * @strong:      if true, strong increment, else weak
1178 * @target_list: list to queue node work on
1179 *
1180 * Increment the ref. @ref->proc->outer_lock must be held on entry
1181 *
1182 * Return: 0, if successful, else errno
1183 */
1184static int binder_inc_ref_olocked(struct binder_ref *ref, int strong,
1185				  struct list_head *target_list)
1186{
1187	int ret;
1188
1189	if (strong) {
1190		if (ref->data.strong == 0) {
1191			ret = binder_inc_node(ref->node, 1, 1, target_list);
1192			if (ret)
1193				return ret;
1194		}
1195		ref->data.strong++;
1196	} else {
1197		if (ref->data.weak == 0) {
1198			ret = binder_inc_node(ref->node, 0, 1, target_list);
1199			if (ret)
1200				return ret;
1201		}
1202		ref->data.weak++;
1203	}
1204	return 0;
1205}
1206
1207/**
1208 * binder_dec_ref_olocked() - dec the ref for given handle
1209 * @ref:	ref to be decremented
1210 * @strong:	if true, strong decrement, else weak
1211 *
1212 * Decrement the ref.
1213 *
1214 * Return: %true if ref is cleaned up and ready to be freed.
1215 */
1216static bool binder_dec_ref_olocked(struct binder_ref *ref, int strong)
1217{
1218	if (strong) {
1219		if (ref->data.strong == 0) {
1220			binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1221					  ref->proc->pid, ref->data.debug_id,
1222					  ref->data.desc, ref->data.strong,
1223					  ref->data.weak);
1224			return false;
1225		}
1226		ref->data.strong--;
1227		if (ref->data.strong == 0)
1228			binder_dec_node(ref->node, strong, 1);
1229	} else {
1230		if (ref->data.weak == 0) {
1231			binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1232					  ref->proc->pid, ref->data.debug_id,
1233					  ref->data.desc, ref->data.strong,
1234					  ref->data.weak);
1235			return false;
1236		}
1237		ref->data.weak--;
1238	}
1239	if (ref->data.strong == 0 && ref->data.weak == 0) {
1240		binder_cleanup_ref_olocked(ref);
1241		return true;
1242	}
1243	return false;
1244}
1245
1246/**
1247 * binder_get_node_from_ref() - get the node from the given proc/desc
1248 * @proc:	proc containing the ref
1249 * @desc:	the handle associated with the ref
1250 * @need_strong_ref: if true, only return node if ref is strong
1251 * @rdata:	the id/refcount data for the ref
1252 *
1253 * Given a proc and ref handle, return the associated binder_node
1254 *
1255 * Return: a binder_node or NULL if not found or not strong when strong required
1256 */
1257static struct binder_node *binder_get_node_from_ref(
1258		struct binder_proc *proc,
1259		u32 desc, bool need_strong_ref,
1260		struct binder_ref_data *rdata)
1261{
1262	struct binder_node *node;
1263	struct binder_ref *ref;
1264
1265	binder_proc_lock(proc);
1266	ref = binder_get_ref_olocked(proc, desc, need_strong_ref);
1267	if (!ref)
1268		goto err_no_ref;
1269	node = ref->node;
1270	/*
1271	 * Take an implicit reference on the node to ensure
1272	 * it stays alive until the call to binder_put_node()
1273	 */
1274	binder_inc_node_tmpref(node);
1275	if (rdata)
1276		*rdata = ref->data;
1277	binder_proc_unlock(proc);
1278
1279	return node;
1280
1281err_no_ref:
1282	binder_proc_unlock(proc);
1283	return NULL;
1284}
1285
1286/**
1287 * binder_free_ref() - free the binder_ref
1288 * @ref:	ref to free
1289 *
1290 * Free the binder_ref. Free the binder_node indicated by ref->node
1291 * (if non-NULL) and the binder_ref_death indicated by ref->death.
1292 */
1293static void binder_free_ref(struct binder_ref *ref)
1294{
1295	if (ref->node)
1296		binder_free_node(ref->node);
1297	kfree(ref->death);
1298	kfree(ref);
1299}
1300
1301/**
1302 * binder_update_ref_for_handle() - inc/dec the ref for given handle
1303 * @proc:	proc containing the ref
1304 * @desc:	the handle associated with the ref
1305 * @increment:	true=inc reference, false=dec reference
1306 * @strong:	true=strong reference, false=weak reference
1307 * @rdata:	the id/refcount data for the ref
1308 *
1309 * Given a proc and ref handle, increment or decrement the ref
1310 * according to "increment" arg.
1311 *
1312 * Return: 0 if successful, else errno
1313 */
1314static int binder_update_ref_for_handle(struct binder_proc *proc,
1315		uint32_t desc, bool increment, bool strong,
1316		struct binder_ref_data *rdata)
1317{
1318	int ret = 0;
1319	struct binder_ref *ref;
1320	bool delete_ref = false;
1321
1322	binder_proc_lock(proc);
1323	ref = binder_get_ref_olocked(proc, desc, strong);
1324	if (!ref) {
1325		ret = -EINVAL;
1326		goto err_no_ref;
1327	}
1328	if (increment)
1329		ret = binder_inc_ref_olocked(ref, strong, NULL);
1330	else
1331		delete_ref = binder_dec_ref_olocked(ref, strong);
1332
1333	if (rdata)
1334		*rdata = ref->data;
1335	binder_proc_unlock(proc);
1336
1337	if (delete_ref)
1338		binder_free_ref(ref);
1339	return ret;
1340
1341err_no_ref:
1342	binder_proc_unlock(proc);
1343	return ret;
1344}
1345
1346/**
1347 * binder_dec_ref_for_handle() - dec the ref for given handle
1348 * @proc:	proc containing the ref
1349 * @desc:	the handle associated with the ref
1350 * @strong:	true=strong reference, false=weak reference
1351 * @rdata:	the id/refcount data for the ref
1352 *
1353 * Just calls binder_update_ref_for_handle() to decrement the ref.
1354 *
1355 * Return: 0 if successful, else errno
1356 */
1357static int binder_dec_ref_for_handle(struct binder_proc *proc,
1358		uint32_t desc, bool strong, struct binder_ref_data *rdata)
1359{
1360	return binder_update_ref_for_handle(proc, desc, false, strong, rdata);
1361}
1362
1363
1364/**
1365 * binder_inc_ref_for_node() - increment the ref for given proc/node
1366 * @proc:	 proc containing the ref
1367 * @node:	 target node
1368 * @strong:	 true=strong reference, false=weak reference
1369 * @target_list: worklist to use if node is incremented
1370 * @rdata:	 the id/refcount data for the ref
1371 *
1372 * Given a proc and node, increment the ref. Create the ref if it
1373 * doesn't already exist
1374 *
1375 * Return: 0 if successful, else errno
1376 */
1377static int binder_inc_ref_for_node(struct binder_proc *proc,
1378			struct binder_node *node,
1379			bool strong,
1380			struct list_head *target_list,
1381			struct binder_ref_data *rdata)
1382{
1383	struct binder_ref *ref;
1384	struct binder_ref *new_ref = NULL;
1385	int ret = 0;
1386
1387	binder_proc_lock(proc);
1388	ref = binder_get_ref_for_node_olocked(proc, node, NULL);
1389	if (!ref) {
1390		binder_proc_unlock(proc);
1391		new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1392		if (!new_ref)
1393			return -ENOMEM;
1394		binder_proc_lock(proc);
1395		ref = binder_get_ref_for_node_olocked(proc, node, new_ref);
1396	}
1397	ret = binder_inc_ref_olocked(ref, strong, target_list);
1398	*rdata = ref->data;
1399	if (ret && ref == new_ref) {
1400		/*
1401		 * Cleanup the failed reference here as the target
1402		 * could now be dead and have already released its
1403		 * references by now. Calling on the new reference
1404		 * with strong=0 and a tmp_refs will not decrement
1405		 * the node. The new_ref gets kfree'd below.
1406		 */
1407		binder_cleanup_ref_olocked(new_ref);
1408		ref = NULL;
1409	}
1410
1411	binder_proc_unlock(proc);
1412	if (new_ref && ref != new_ref)
1413		/*
1414		 * Another thread created the ref first so
1415		 * free the one we allocated
1416		 */
1417		kfree(new_ref);
1418	return ret;
1419}
1420
1421static void binder_pop_transaction_ilocked(struct binder_thread *target_thread,
1422					   struct binder_transaction *t)
1423{
1424	BUG_ON(!target_thread);
1425	assert_spin_locked(&target_thread->proc->inner_lock);
1426	BUG_ON(target_thread->transaction_stack != t);
1427	BUG_ON(target_thread->transaction_stack->from != target_thread);
1428	target_thread->transaction_stack =
1429		target_thread->transaction_stack->from_parent;
1430	t->from = NULL;
1431}
1432
1433/**
1434 * binder_thread_dec_tmpref() - decrement thread->tmp_ref
1435 * @thread:	thread to decrement
1436 *
1437 * A thread needs to be kept alive while being used to create or
1438 * handle a transaction. binder_get_txn_from() is used to safely
1439 * extract t->from from a binder_transaction and keep the thread
1440 * indicated by t->from from being freed. When done with that
1441 * binder_thread, this function is called to decrement the
1442 * tmp_ref and free if appropriate (thread has been released
1443 * and no transaction being processed by the driver)
1444 */
1445static void binder_thread_dec_tmpref(struct binder_thread *thread)
1446{
1447	/*
1448	 * atomic is used to protect the counter value while
1449	 * it cannot reach zero or thread->is_dead is false
1450	 */
1451	binder_inner_proc_lock(thread->proc);
1452	atomic_dec(&thread->tmp_ref);
1453	if (thread->is_dead && !atomic_read(&thread->tmp_ref)) {
1454		binder_inner_proc_unlock(thread->proc);
1455		binder_free_thread(thread);
1456		return;
1457	}
1458	binder_inner_proc_unlock(thread->proc);
1459}
1460
1461/**
1462 * binder_proc_dec_tmpref() - decrement proc->tmp_ref
1463 * @proc:	proc to decrement
1464 *
1465 * A binder_proc needs to be kept alive while being used to create or
1466 * handle a transaction. proc->tmp_ref is incremented when
1467 * creating a new transaction or the binder_proc is currently in-use
1468 * by threads that are being released. When done with the binder_proc,
1469 * this function is called to decrement the counter and free the
1470 * proc if appropriate (proc has been released, all threads have
1471 * been released and not currenly in-use to process a transaction).
1472 */
1473static void binder_proc_dec_tmpref(struct binder_proc *proc)
1474{
1475	binder_inner_proc_lock(proc);
1476	proc->tmp_ref--;
1477	if (proc->is_dead && RB_EMPTY_ROOT(&proc->threads) &&
1478			!proc->tmp_ref) {
1479		binder_inner_proc_unlock(proc);
1480		binder_free_proc(proc);
1481		return;
1482	}
1483	binder_inner_proc_unlock(proc);
1484}
1485
1486/**
1487 * binder_get_txn_from() - safely extract the "from" thread in transaction
1488 * @t:	binder transaction for t->from
1489 *
1490 * Atomically return the "from" thread and increment the tmp_ref
1491 * count for the thread to ensure it stays alive until
1492 * binder_thread_dec_tmpref() is called.
1493 *
1494 * Return: the value of t->from
1495 */
1496static struct binder_thread *binder_get_txn_from(
1497		struct binder_transaction *t)
1498{
1499	struct binder_thread *from;
1500
1501	spin_lock(&t->lock);
1502	from = t->from;
1503	if (from)
1504		atomic_inc(&from->tmp_ref);
1505	spin_unlock(&t->lock);
1506	return from;
1507}
1508
1509/**
1510 * binder_get_txn_from_and_acq_inner() - get t->from and acquire inner lock
1511 * @t:	binder transaction for t->from
1512 *
1513 * Same as binder_get_txn_from() except it also acquires the proc->inner_lock
1514 * to guarantee that the thread cannot be released while operating on it.
1515 * The caller must call binder_inner_proc_unlock() to release the inner lock
1516 * as well as call binder_dec_thread_txn() to release the reference.
1517 *
1518 * Return: the value of t->from
1519 */
1520static struct binder_thread *binder_get_txn_from_and_acq_inner(
1521		struct binder_transaction *t)
1522	__acquires(&t->from->proc->inner_lock)
1523{
1524	struct binder_thread *from;
1525
1526	from = binder_get_txn_from(t);
1527	if (!from) {
1528		__acquire(&from->proc->inner_lock);
1529		return NULL;
1530	}
1531	binder_inner_proc_lock(from->proc);
1532	if (t->from) {
1533		BUG_ON(from != t->from);
1534		return from;
1535	}
1536	binder_inner_proc_unlock(from->proc);
1537	__acquire(&from->proc->inner_lock);
1538	binder_thread_dec_tmpref(from);
1539	return NULL;
1540}
1541
1542/**
1543 * binder_free_txn_fixups() - free unprocessed fd fixups
1544 * @t:	binder transaction for t->from
1545 *
1546 * If the transaction is being torn down prior to being
1547 * processed by the target process, free all of the
1548 * fd fixups and fput the file structs. It is safe to
1549 * call this function after the fixups have been
1550 * processed -- in that case, the list will be empty.
1551 */
1552static void binder_free_txn_fixups(struct binder_transaction *t)
1553{
1554	struct binder_txn_fd_fixup *fixup, *tmp;
1555
1556	list_for_each_entry_safe(fixup, tmp, &t->fd_fixups, fixup_entry) {
1557		fput(fixup->file);
1558		if (fixup->target_fd >= 0)
1559			put_unused_fd(fixup->target_fd);
1560		list_del(&fixup->fixup_entry);
1561		kfree(fixup);
1562	}
1563}
1564
1565static void binder_txn_latency_free(struct binder_transaction *t)
1566{
1567	int from_proc, from_thread, to_proc, to_thread;
1568
1569	spin_lock(&t->lock);
1570	from_proc = t->from ? t->from->proc->pid : 0;
1571	from_thread = t->from ? t->from->pid : 0;
1572	to_proc = t->to_proc ? t->to_proc->pid : 0;
1573	to_thread = t->to_thread ? t->to_thread->pid : 0;
1574	spin_unlock(&t->lock);
1575
1576	trace_binder_txn_latency_free(t, from_proc, from_thread, to_proc, to_thread);
1577}
1578
1579static void binder_free_transaction(struct binder_transaction *t)
1580{
1581	struct binder_proc *target_proc = t->to_proc;
1582
1583	if (target_proc) {
1584		binder_inner_proc_lock(target_proc);
1585		target_proc->outstanding_txns--;
1586		if (target_proc->outstanding_txns < 0)
1587			pr_warn("%s: Unexpected outstanding_txns %d\n",
1588				__func__, target_proc->outstanding_txns);
1589		if (!target_proc->outstanding_txns && target_proc->is_frozen)
1590			wake_up_interruptible_all(&target_proc->freeze_wait);
1591		if (t->buffer)
1592			t->buffer->transaction = NULL;
1593		binder_inner_proc_unlock(target_proc);
1594	}
1595	if (trace_binder_txn_latency_free_enabled())
1596		binder_txn_latency_free(t);
1597	/*
1598	 * If the transaction has no target_proc, then
1599	 * t->buffer->transaction has already been cleared.
1600	 */
1601	binder_free_txn_fixups(t);
1602	kfree(t);
1603	binder_stats_deleted(BINDER_STAT_TRANSACTION);
1604}
1605
1606static void binder_send_failed_reply(struct binder_transaction *t,
1607				     uint32_t error_code)
1608{
1609	struct binder_thread *target_thread;
1610	struct binder_transaction *next;
1611
1612	BUG_ON(t->flags & TF_ONE_WAY);
1613	while (1) {
1614		target_thread = binder_get_txn_from_and_acq_inner(t);
1615		if (target_thread) {
1616			binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1617				     "send failed reply for transaction %d to %d:%d\n",
1618				      t->debug_id,
1619				      target_thread->proc->pid,
1620				      target_thread->pid);
1621
1622			binder_pop_transaction_ilocked(target_thread, t);
1623			if (target_thread->reply_error.cmd == BR_OK) {
1624				target_thread->reply_error.cmd = error_code;
1625				binder_enqueue_thread_work_ilocked(
1626					target_thread,
1627					&target_thread->reply_error.work);
1628				wake_up_interruptible(&target_thread->wait);
1629			} else {
1630				/*
1631				 * Cannot get here for normal operation, but
1632				 * we can if multiple synchronous transactions
1633				 * are sent without blocking for responses.
1634				 * Just ignore the 2nd error in this case.
1635				 */
1636				pr_warn("Unexpected reply error: %u\n",
1637					target_thread->reply_error.cmd);
1638			}
1639			binder_inner_proc_unlock(target_thread->proc);
1640			binder_thread_dec_tmpref(target_thread);
1641			binder_free_transaction(t);
1642			return;
 
 
1643		}
1644		__release(&target_thread->proc->inner_lock);
1645		next = t->from_parent;
1646
1647		binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1648			     "send failed reply for transaction %d, target dead\n",
1649			     t->debug_id);
1650
1651		binder_free_transaction(t);
1652		if (next == NULL) {
1653			binder_debug(BINDER_DEBUG_DEAD_BINDER,
1654				     "reply failed, no target thread at root\n");
1655			return;
1656		}
1657		t = next;
1658		binder_debug(BINDER_DEBUG_DEAD_BINDER,
1659			     "reply failed, no target thread -- retry %d\n",
1660			      t->debug_id);
1661	}
1662}
1663
1664/**
1665 * binder_cleanup_transaction() - cleans up undelivered transaction
1666 * @t:		transaction that needs to be cleaned up
1667 * @reason:	reason the transaction wasn't delivered
1668 * @error_code:	error to return to caller (if synchronous call)
1669 */
1670static void binder_cleanup_transaction(struct binder_transaction *t,
1671				       const char *reason,
1672				       uint32_t error_code)
1673{
1674	if (t->buffer->target_node && !(t->flags & TF_ONE_WAY)) {
1675		binder_send_failed_reply(t, error_code);
1676	} else {
1677		binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
1678			"undelivered transaction %d, %s\n",
1679			t->debug_id, reason);
1680		binder_free_transaction(t);
1681	}
1682}
1683
1684/**
1685 * binder_get_object() - gets object and checks for valid metadata
1686 * @proc:	binder_proc owning the buffer
1687 * @u:		sender's user pointer to base of buffer
1688 * @buffer:	binder_buffer that we're parsing.
1689 * @offset:	offset in the @buffer at which to validate an object.
1690 * @object:	struct binder_object to read into
1691 *
1692 * Copy the binder object at the given offset into @object. If @u is
1693 * provided then the copy is from the sender's buffer. If not, then
1694 * it is copied from the target's @buffer.
1695 *
1696 * Return:	If there's a valid metadata object at @offset, the
1697 *		size of that object. Otherwise, it returns zero. The object
1698 *		is read into the struct binder_object pointed to by @object.
1699 */
1700static size_t binder_get_object(struct binder_proc *proc,
1701				const void __user *u,
1702				struct binder_buffer *buffer,
1703				unsigned long offset,
1704				struct binder_object *object)
1705{
1706	size_t read_size;
1707	struct binder_object_header *hdr;
1708	size_t object_size = 0;
1709
1710	read_size = min_t(size_t, sizeof(*object), buffer->data_size - offset);
1711	if (offset > buffer->data_size || read_size < sizeof(*hdr))
 
 
1712		return 0;
1713	if (u) {
1714		if (copy_from_user(object, u + offset, read_size))
1715			return 0;
1716	} else {
1717		if (binder_alloc_copy_from_buffer(&proc->alloc, object, buffer,
1718						  offset, read_size))
1719			return 0;
1720	}
1721
1722	/* Ok, now see if we read a complete object. */
1723	hdr = &object->hdr;
1724	switch (hdr->type) {
1725	case BINDER_TYPE_BINDER:
1726	case BINDER_TYPE_WEAK_BINDER:
1727	case BINDER_TYPE_HANDLE:
1728	case BINDER_TYPE_WEAK_HANDLE:
1729		object_size = sizeof(struct flat_binder_object);
1730		break;
1731	case BINDER_TYPE_FD:
1732		object_size = sizeof(struct binder_fd_object);
1733		break;
1734	case BINDER_TYPE_PTR:
1735		object_size = sizeof(struct binder_buffer_object);
1736		break;
1737	case BINDER_TYPE_FDA:
1738		object_size = sizeof(struct binder_fd_array_object);
1739		break;
1740	default:
1741		return 0;
1742	}
1743	if (offset <= buffer->data_size - object_size &&
1744	    buffer->data_size >= object_size)
1745		return object_size;
1746	else
1747		return 0;
1748}
1749
1750/**
1751 * binder_validate_ptr() - validates binder_buffer_object in a binder_buffer.
1752 * @proc:	binder_proc owning the buffer
1753 * @b:		binder_buffer containing the object
1754 * @object:	struct binder_object to read into
1755 * @index:	index in offset array at which the binder_buffer_object is
1756 *		located
1757 * @start_offset: points to the start of the offset array
1758 * @object_offsetp: offset of @object read from @b
1759 * @num_valid:	the number of valid offsets in the offset array
1760 *
1761 * Return:	If @index is within the valid range of the offset array
1762 *		described by @start and @num_valid, and if there's a valid
1763 *		binder_buffer_object at the offset found in index @index
1764 *		of the offset array, that object is returned. Otherwise,
1765 *		%NULL is returned.
1766 *		Note that the offset found in index @index itself is not
1767 *		verified; this function assumes that @num_valid elements
1768 *		from @start were previously verified to have valid offsets.
1769 *		If @object_offsetp is non-NULL, then the offset within
1770 *		@b is written to it.
1771 */
1772static struct binder_buffer_object *binder_validate_ptr(
1773						struct binder_proc *proc,
1774						struct binder_buffer *b,
1775						struct binder_object *object,
1776						binder_size_t index,
1777						binder_size_t start_offset,
1778						binder_size_t *object_offsetp,
1779						binder_size_t num_valid)
1780{
1781	size_t object_size;
1782	binder_size_t object_offset;
1783	unsigned long buffer_offset;
1784
1785	if (index >= num_valid)
1786		return NULL;
1787
1788	buffer_offset = start_offset + sizeof(binder_size_t) * index;
1789	if (binder_alloc_copy_from_buffer(&proc->alloc, &object_offset,
1790					  b, buffer_offset,
1791					  sizeof(object_offset)))
1792		return NULL;
1793	object_size = binder_get_object(proc, NULL, b, object_offset, object);
1794	if (!object_size || object->hdr.type != BINDER_TYPE_PTR)
1795		return NULL;
1796	if (object_offsetp)
1797		*object_offsetp = object_offset;
1798
1799	return &object->bbo;
1800}
1801
1802/**
1803 * binder_validate_fixup() - validates pointer/fd fixups happen in order.
1804 * @proc:		binder_proc owning the buffer
1805 * @b:			transaction buffer
1806 * @objects_start_offset: offset to start of objects buffer
1807 * @buffer_obj_offset:	offset to binder_buffer_object in which to fix up
1808 * @fixup_offset:	start offset in @buffer to fix up
1809 * @last_obj_offset:	offset to last binder_buffer_object that we fixed
1810 * @last_min_offset:	minimum fixup offset in object at @last_obj_offset
1811 *
1812 * Return:		%true if a fixup in buffer @buffer at offset @offset is
1813 *			allowed.
1814 *
1815 * For safety reasons, we only allow fixups inside a buffer to happen
1816 * at increasing offsets; additionally, we only allow fixup on the last
1817 * buffer object that was verified, or one of its parents.
1818 *
1819 * Example of what is allowed:
1820 *
1821 * A
1822 *   B (parent = A, offset = 0)
1823 *   C (parent = A, offset = 16)
1824 *     D (parent = C, offset = 0)
1825 *   E (parent = A, offset = 32) // min_offset is 16 (C.parent_offset)
1826 *
1827 * Examples of what is not allowed:
1828 *
1829 * Decreasing offsets within the same parent:
1830 * A
1831 *   C (parent = A, offset = 16)
1832 *   B (parent = A, offset = 0) // decreasing offset within A
1833 *
1834 * Referring to a parent that wasn't the last object or any of its parents:
1835 * A
1836 *   B (parent = A, offset = 0)
1837 *   C (parent = A, offset = 0)
1838 *   C (parent = A, offset = 16)
1839 *     D (parent = B, offset = 0) // B is not A or any of A's parents
1840 */
1841static bool binder_validate_fixup(struct binder_proc *proc,
1842				  struct binder_buffer *b,
1843				  binder_size_t objects_start_offset,
1844				  binder_size_t buffer_obj_offset,
1845				  binder_size_t fixup_offset,
1846				  binder_size_t last_obj_offset,
1847				  binder_size_t last_min_offset)
1848{
1849	if (!last_obj_offset) {
1850		/* Nothing to fix up in */
1851		return false;
1852	}
1853
1854	while (last_obj_offset != buffer_obj_offset) {
1855		unsigned long buffer_offset;
1856		struct binder_object last_object;
1857		struct binder_buffer_object *last_bbo;
1858		size_t object_size = binder_get_object(proc, NULL, b,
1859						       last_obj_offset,
1860						       &last_object);
1861		if (object_size != sizeof(*last_bbo))
1862			return false;
1863
1864		last_bbo = &last_object.bbo;
1865		/*
1866		 * Safe to retrieve the parent of last_obj, since it
1867		 * was already previously verified by the driver.
1868		 */
1869		if ((last_bbo->flags & BINDER_BUFFER_FLAG_HAS_PARENT) == 0)
1870			return false;
1871		last_min_offset = last_bbo->parent_offset + sizeof(uintptr_t);
1872		buffer_offset = objects_start_offset +
1873			sizeof(binder_size_t) * last_bbo->parent;
1874		if (binder_alloc_copy_from_buffer(&proc->alloc,
1875						  &last_obj_offset,
1876						  b, buffer_offset,
1877						  sizeof(last_obj_offset)))
1878			return false;
1879	}
1880	return (fixup_offset >= last_min_offset);
1881}
1882
1883/**
1884 * struct binder_task_work_cb - for deferred close
1885 *
1886 * @twork:                callback_head for task work
1887 * @fd:                   fd to close
1888 *
1889 * Structure to pass task work to be handled after
1890 * returning from binder_ioctl() via task_work_add().
1891 */
1892struct binder_task_work_cb {
1893	struct callback_head twork;
1894	struct file *file;
1895};
1896
1897/**
1898 * binder_do_fd_close() - close list of file descriptors
1899 * @twork:	callback head for task work
1900 *
1901 * It is not safe to call ksys_close() during the binder_ioctl()
1902 * function if there is a chance that binder's own file descriptor
1903 * might be closed. This is to meet the requirements for using
1904 * fdget() (see comments for __fget_light()). Therefore use
1905 * task_work_add() to schedule the close operation once we have
1906 * returned from binder_ioctl(). This function is a callback
1907 * for that mechanism and does the actual ksys_close() on the
1908 * given file descriptor.
1909 */
1910static void binder_do_fd_close(struct callback_head *twork)
1911{
1912	struct binder_task_work_cb *twcb = container_of(twork,
1913			struct binder_task_work_cb, twork);
1914
1915	fput(twcb->file);
1916	kfree(twcb);
1917}
1918
1919/**
1920 * binder_deferred_fd_close() - schedule a close for the given file-descriptor
1921 * @fd:		file-descriptor to close
1922 *
1923 * See comments in binder_do_fd_close(). This function is used to schedule
1924 * a file-descriptor to be closed after returning from binder_ioctl().
1925 */
1926static void binder_deferred_fd_close(int fd)
1927{
1928	struct binder_task_work_cb *twcb;
1929
1930	twcb = kzalloc(sizeof(*twcb), GFP_KERNEL);
1931	if (!twcb)
1932		return;
1933	init_task_work(&twcb->twork, binder_do_fd_close);
1934	twcb->file = file_close_fd(fd);
1935	if (twcb->file) {
1936		// pin it until binder_do_fd_close(); see comments there
1937		get_file(twcb->file);
1938		filp_close(twcb->file, current->files);
1939		task_work_add(current, &twcb->twork, TWA_RESUME);
1940	} else {
1941		kfree(twcb);
1942	}
1943}
1944
1945static void binder_transaction_buffer_release(struct binder_proc *proc,
1946					      struct binder_thread *thread,
1947					      struct binder_buffer *buffer,
1948					      binder_size_t off_end_offset,
1949					      bool is_failure)
1950{
1951	int debug_id = buffer->debug_id;
1952	binder_size_t off_start_offset, buffer_offset;
1953
1954	binder_debug(BINDER_DEBUG_TRANSACTION,
1955		     "%d buffer release %d, size %zd-%zd, failed at %llx\n",
1956		     proc->pid, buffer->debug_id,
1957		     buffer->data_size, buffer->offsets_size,
1958		     (unsigned long long)off_end_offset);
1959
1960	if (buffer->target_node)
1961		binder_dec_node(buffer->target_node, 1, 0);
1962
1963	off_start_offset = ALIGN(buffer->data_size, sizeof(void *));
1964
 
1965	for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
1966	     buffer_offset += sizeof(binder_size_t)) {
1967		struct binder_object_header *hdr;
1968		size_t object_size = 0;
1969		struct binder_object object;
1970		binder_size_t object_offset;
1971
1972		if (!binder_alloc_copy_from_buffer(&proc->alloc, &object_offset,
1973						   buffer, buffer_offset,
1974						   sizeof(object_offset)))
1975			object_size = binder_get_object(proc, NULL, buffer,
1976							object_offset, &object);
1977		if (object_size == 0) {
1978			pr_err("transaction release %d bad object at offset %lld, size %zd\n",
1979			       debug_id, (u64)object_offset, buffer->data_size);
1980			continue;
1981		}
1982		hdr = &object.hdr;
1983		switch (hdr->type) {
1984		case BINDER_TYPE_BINDER:
1985		case BINDER_TYPE_WEAK_BINDER: {
1986			struct flat_binder_object *fp;
1987			struct binder_node *node;
1988
1989			fp = to_flat_binder_object(hdr);
1990			node = binder_get_node(proc, fp->binder);
1991			if (node == NULL) {
1992				pr_err("transaction release %d bad node %016llx\n",
1993				       debug_id, (u64)fp->binder);
1994				break;
1995			}
1996			binder_debug(BINDER_DEBUG_TRANSACTION,
1997				     "        node %d u%016llx\n",
1998				     node->debug_id, (u64)node->ptr);
1999			binder_dec_node(node, hdr->type == BINDER_TYPE_BINDER,
2000					0);
2001			binder_put_node(node);
2002		} break;
2003		case BINDER_TYPE_HANDLE:
2004		case BINDER_TYPE_WEAK_HANDLE: {
2005			struct flat_binder_object *fp;
2006			struct binder_ref_data rdata;
2007			int ret;
2008
2009			fp = to_flat_binder_object(hdr);
2010			ret = binder_dec_ref_for_handle(proc, fp->handle,
2011				hdr->type == BINDER_TYPE_HANDLE, &rdata);
2012
2013			if (ret) {
2014				pr_err("transaction release %d bad handle %d, ret = %d\n",
2015				 debug_id, fp->handle, ret);
2016				break;
2017			}
2018			binder_debug(BINDER_DEBUG_TRANSACTION,
2019				     "        ref %d desc %d\n",
2020				     rdata.debug_id, rdata.desc);
2021		} break;
2022
2023		case BINDER_TYPE_FD: {
2024			/*
2025			 * No need to close the file here since user-space
2026			 * closes it for successfully delivered
2027			 * transactions. For transactions that weren't
2028			 * delivered, the new fd was never allocated so
2029			 * there is no need to close and the fput on the
2030			 * file is done when the transaction is torn
2031			 * down.
2032			 */
 
 
2033		} break;
2034		case BINDER_TYPE_PTR:
2035			/*
2036			 * Nothing to do here, this will get cleaned up when the
2037			 * transaction buffer gets freed
2038			 */
2039			break;
2040		case BINDER_TYPE_FDA: {
2041			struct binder_fd_array_object *fda;
2042			struct binder_buffer_object *parent;
2043			struct binder_object ptr_object;
2044			binder_size_t fda_offset;
2045			size_t fd_index;
2046			binder_size_t fd_buf_size;
2047			binder_size_t num_valid;
2048
2049			if (is_failure) {
2050				/*
 
2051				 * The fd fixups have not been applied so no
2052				 * fds need to be closed.
2053				 */
2054				continue;
2055			}
2056
2057			num_valid = (buffer_offset - off_start_offset) /
2058						sizeof(binder_size_t);
2059			fda = to_binder_fd_array_object(hdr);
2060			parent = binder_validate_ptr(proc, buffer, &ptr_object,
2061						     fda->parent,
2062						     off_start_offset,
2063						     NULL,
2064						     num_valid);
2065			if (!parent) {
2066				pr_err("transaction release %d bad parent offset\n",
2067				       debug_id);
2068				continue;
2069			}
2070			fd_buf_size = sizeof(u32) * fda->num_fds;
2071			if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
2072				pr_err("transaction release %d invalid number of fds (%lld)\n",
2073				       debug_id, (u64)fda->num_fds);
2074				continue;
2075			}
2076			if (fd_buf_size > parent->length ||
2077			    fda->parent_offset > parent->length - fd_buf_size) {
2078				/* No space for all file descriptors here. */
2079				pr_err("transaction release %d not enough space for %lld fds in buffer\n",
2080				       debug_id, (u64)fda->num_fds);
2081				continue;
2082			}
2083			/*
2084			 * the source data for binder_buffer_object is visible
2085			 * to user-space and the @buffer element is the user
2086			 * pointer to the buffer_object containing the fd_array.
2087			 * Convert the address to an offset relative to
2088			 * the base of the transaction buffer.
2089			 */
2090			fda_offset = parent->buffer - buffer->user_data +
2091				fda->parent_offset;
 
2092			for (fd_index = 0; fd_index < fda->num_fds;
2093			     fd_index++) {
2094				u32 fd;
2095				int err;
2096				binder_size_t offset = fda_offset +
2097					fd_index * sizeof(fd);
2098
2099				err = binder_alloc_copy_from_buffer(
2100						&proc->alloc, &fd, buffer,
2101						offset, sizeof(fd));
2102				WARN_ON(err);
2103				if (!err) {
2104					binder_deferred_fd_close(fd);
2105					/*
2106					 * Need to make sure the thread goes
2107					 * back to userspace to complete the
2108					 * deferred close
2109					 */
2110					if (thread)
2111						thread->looper_need_return = true;
2112				}
2113			}
2114		} break;
2115		default:
2116			pr_err("transaction release %d bad object type %x\n",
2117				debug_id, hdr->type);
2118			break;
2119		}
2120	}
2121}
2122
2123/* Clean up all the objects in the buffer */
2124static inline void binder_release_entire_buffer(struct binder_proc *proc,
2125						struct binder_thread *thread,
2126						struct binder_buffer *buffer,
2127						bool is_failure)
2128{
2129	binder_size_t off_end_offset;
2130
2131	off_end_offset = ALIGN(buffer->data_size, sizeof(void *));
2132	off_end_offset += buffer->offsets_size;
2133
2134	binder_transaction_buffer_release(proc, thread, buffer,
2135					  off_end_offset, is_failure);
2136}
2137
2138static int binder_translate_binder(struct flat_binder_object *fp,
2139				   struct binder_transaction *t,
2140				   struct binder_thread *thread)
2141{
2142	struct binder_node *node;
2143	struct binder_proc *proc = thread->proc;
2144	struct binder_proc *target_proc = t->to_proc;
2145	struct binder_ref_data rdata;
2146	int ret = 0;
2147
2148	node = binder_get_node(proc, fp->binder);
2149	if (!node) {
2150		node = binder_new_node(proc, fp);
2151		if (!node)
2152			return -ENOMEM;
2153	}
2154	if (fp->cookie != node->cookie) {
2155		binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
2156				  proc->pid, thread->pid, (u64)fp->binder,
2157				  node->debug_id, (u64)fp->cookie,
2158				  (u64)node->cookie);
2159		ret = -EINVAL;
2160		goto done;
2161	}
2162	if (security_binder_transfer_binder(proc->cred, target_proc->cred)) {
2163		ret = -EPERM;
2164		goto done;
2165	}
2166
2167	ret = binder_inc_ref_for_node(target_proc, node,
2168			fp->hdr.type == BINDER_TYPE_BINDER,
2169			&thread->todo, &rdata);
2170	if (ret)
2171		goto done;
2172
2173	if (fp->hdr.type == BINDER_TYPE_BINDER)
2174		fp->hdr.type = BINDER_TYPE_HANDLE;
2175	else
2176		fp->hdr.type = BINDER_TYPE_WEAK_HANDLE;
2177	fp->binder = 0;
2178	fp->handle = rdata.desc;
2179	fp->cookie = 0;
2180
2181	trace_binder_transaction_node_to_ref(t, node, &rdata);
2182	binder_debug(BINDER_DEBUG_TRANSACTION,
2183		     "        node %d u%016llx -> ref %d desc %d\n",
2184		     node->debug_id, (u64)node->ptr,
2185		     rdata.debug_id, rdata.desc);
2186done:
2187	binder_put_node(node);
2188	return ret;
2189}
2190
2191static int binder_translate_handle(struct flat_binder_object *fp,
2192				   struct binder_transaction *t,
2193				   struct binder_thread *thread)
2194{
2195	struct binder_proc *proc = thread->proc;
2196	struct binder_proc *target_proc = t->to_proc;
2197	struct binder_node *node;
2198	struct binder_ref_data src_rdata;
2199	int ret = 0;
2200
2201	node = binder_get_node_from_ref(proc, fp->handle,
2202			fp->hdr.type == BINDER_TYPE_HANDLE, &src_rdata);
2203	if (!node) {
2204		binder_user_error("%d:%d got transaction with invalid handle, %d\n",
2205				  proc->pid, thread->pid, fp->handle);
2206		return -EINVAL;
2207	}
2208	if (security_binder_transfer_binder(proc->cred, target_proc->cred)) {
2209		ret = -EPERM;
2210		goto done;
2211	}
2212
2213	binder_node_lock(node);
2214	if (node->proc == target_proc) {
2215		if (fp->hdr.type == BINDER_TYPE_HANDLE)
2216			fp->hdr.type = BINDER_TYPE_BINDER;
2217		else
2218			fp->hdr.type = BINDER_TYPE_WEAK_BINDER;
2219		fp->binder = node->ptr;
2220		fp->cookie = node->cookie;
2221		if (node->proc)
2222			binder_inner_proc_lock(node->proc);
2223		else
2224			__acquire(&node->proc->inner_lock);
2225		binder_inc_node_nilocked(node,
2226					 fp->hdr.type == BINDER_TYPE_BINDER,
2227					 0, NULL);
2228		if (node->proc)
2229			binder_inner_proc_unlock(node->proc);
2230		else
2231			__release(&node->proc->inner_lock);
2232		trace_binder_transaction_ref_to_node(t, node, &src_rdata);
2233		binder_debug(BINDER_DEBUG_TRANSACTION,
2234			     "        ref %d desc %d -> node %d u%016llx\n",
2235			     src_rdata.debug_id, src_rdata.desc, node->debug_id,
2236			     (u64)node->ptr);
2237		binder_node_unlock(node);
2238	} else {
2239		struct binder_ref_data dest_rdata;
2240
2241		binder_node_unlock(node);
2242		ret = binder_inc_ref_for_node(target_proc, node,
2243				fp->hdr.type == BINDER_TYPE_HANDLE,
2244				NULL, &dest_rdata);
2245		if (ret)
2246			goto done;
2247
2248		fp->binder = 0;
2249		fp->handle = dest_rdata.desc;
2250		fp->cookie = 0;
2251		trace_binder_transaction_ref_to_ref(t, node, &src_rdata,
2252						    &dest_rdata);
2253		binder_debug(BINDER_DEBUG_TRANSACTION,
2254			     "        ref %d desc %d -> ref %d desc %d (node %d)\n",
2255			     src_rdata.debug_id, src_rdata.desc,
2256			     dest_rdata.debug_id, dest_rdata.desc,
2257			     node->debug_id);
2258	}
2259done:
2260	binder_put_node(node);
2261	return ret;
2262}
2263
2264static int binder_translate_fd(u32 fd, binder_size_t fd_offset,
2265			       struct binder_transaction *t,
2266			       struct binder_thread *thread,
2267			       struct binder_transaction *in_reply_to)
2268{
2269	struct binder_proc *proc = thread->proc;
2270	struct binder_proc *target_proc = t->to_proc;
2271	struct binder_txn_fd_fixup *fixup;
2272	struct file *file;
2273	int ret = 0;
2274	bool target_allows_fd;
2275
2276	if (in_reply_to)
2277		target_allows_fd = !!(in_reply_to->flags & TF_ACCEPT_FDS);
2278	else
2279		target_allows_fd = t->buffer->target_node->accept_fds;
2280	if (!target_allows_fd) {
2281		binder_user_error("%d:%d got %s with fd, %d, but target does not allow fds\n",
2282				  proc->pid, thread->pid,
2283				  in_reply_to ? "reply" : "transaction",
2284				  fd);
2285		ret = -EPERM;
2286		goto err_fd_not_accepted;
2287	}
2288
2289	file = fget(fd);
2290	if (!file) {
2291		binder_user_error("%d:%d got transaction with invalid fd, %d\n",
2292				  proc->pid, thread->pid, fd);
2293		ret = -EBADF;
2294		goto err_fget;
2295	}
2296	ret = security_binder_transfer_file(proc->cred, target_proc->cred, file);
2297	if (ret < 0) {
2298		ret = -EPERM;
2299		goto err_security;
2300	}
2301
2302	/*
2303	 * Add fixup record for this transaction. The allocation
2304	 * of the fd in the target needs to be done from a
2305	 * target thread.
2306	 */
2307	fixup = kzalloc(sizeof(*fixup), GFP_KERNEL);
2308	if (!fixup) {
2309		ret = -ENOMEM;
2310		goto err_alloc;
2311	}
2312	fixup->file = file;
2313	fixup->offset = fd_offset;
2314	fixup->target_fd = -1;
2315	trace_binder_transaction_fd_send(t, fd, fixup->offset);
2316	list_add_tail(&fixup->fixup_entry, &t->fd_fixups);
2317
2318	return ret;
2319
2320err_alloc:
2321err_security:
2322	fput(file);
2323err_fget:
2324err_fd_not_accepted:
2325	return ret;
2326}
2327
2328/**
2329 * struct binder_ptr_fixup - data to be fixed-up in target buffer
2330 * @offset	offset in target buffer to fixup
2331 * @skip_size	bytes to skip in copy (fixup will be written later)
2332 * @fixup_data	data to write at fixup offset
2333 * @node	list node
2334 *
2335 * This is used for the pointer fixup list (pf) which is created and consumed
2336 * during binder_transaction() and is only accessed locally. No
2337 * locking is necessary.
2338 *
2339 * The list is ordered by @offset.
2340 */
2341struct binder_ptr_fixup {
2342	binder_size_t offset;
2343	size_t skip_size;
2344	binder_uintptr_t fixup_data;
2345	struct list_head node;
2346};
2347
2348/**
2349 * struct binder_sg_copy - scatter-gather data to be copied
2350 * @offset		offset in target buffer
2351 * @sender_uaddr	user address in source buffer
2352 * @length		bytes to copy
2353 * @node		list node
2354 *
2355 * This is used for the sg copy list (sgc) which is created and consumed
2356 * during binder_transaction() and is only accessed locally. No
2357 * locking is necessary.
2358 *
2359 * The list is ordered by @offset.
2360 */
2361struct binder_sg_copy {
2362	binder_size_t offset;
2363	const void __user *sender_uaddr;
2364	size_t length;
2365	struct list_head node;
2366};
2367
2368/**
2369 * binder_do_deferred_txn_copies() - copy and fixup scatter-gather data
2370 * @alloc:	binder_alloc associated with @buffer
2371 * @buffer:	binder buffer in target process
2372 * @sgc_head:	list_head of scatter-gather copy list
2373 * @pf_head:	list_head of pointer fixup list
2374 *
2375 * Processes all elements of @sgc_head, applying fixups from @pf_head
2376 * and copying the scatter-gather data from the source process' user
2377 * buffer to the target's buffer. It is expected that the list creation
2378 * and processing all occurs during binder_transaction() so these lists
2379 * are only accessed in local context.
2380 *
2381 * Return: 0=success, else -errno
2382 */
2383static int binder_do_deferred_txn_copies(struct binder_alloc *alloc,
2384					 struct binder_buffer *buffer,
2385					 struct list_head *sgc_head,
2386					 struct list_head *pf_head)
2387{
2388	int ret = 0;
2389	struct binder_sg_copy *sgc, *tmpsgc;
2390	struct binder_ptr_fixup *tmppf;
2391	struct binder_ptr_fixup *pf =
2392		list_first_entry_or_null(pf_head, struct binder_ptr_fixup,
2393					 node);
2394
2395	list_for_each_entry_safe(sgc, tmpsgc, sgc_head, node) {
2396		size_t bytes_copied = 0;
2397
2398		while (bytes_copied < sgc->length) {
2399			size_t copy_size;
2400			size_t bytes_left = sgc->length - bytes_copied;
2401			size_t offset = sgc->offset + bytes_copied;
2402
2403			/*
2404			 * We copy up to the fixup (pointed to by pf)
2405			 */
2406			copy_size = pf ? min(bytes_left, (size_t)pf->offset - offset)
2407				       : bytes_left;
2408			if (!ret && copy_size)
2409				ret = binder_alloc_copy_user_to_buffer(
2410						alloc, buffer,
2411						offset,
2412						sgc->sender_uaddr + bytes_copied,
2413						copy_size);
2414			bytes_copied += copy_size;
2415			if (copy_size != bytes_left) {
2416				BUG_ON(!pf);
2417				/* we stopped at a fixup offset */
2418				if (pf->skip_size) {
2419					/*
2420					 * we are just skipping. This is for
2421					 * BINDER_TYPE_FDA where the translated
2422					 * fds will be fixed up when we get
2423					 * to target context.
2424					 */
2425					bytes_copied += pf->skip_size;
2426				} else {
2427					/* apply the fixup indicated by pf */
2428					if (!ret)
2429						ret = binder_alloc_copy_to_buffer(
2430							alloc, buffer,
2431							pf->offset,
2432							&pf->fixup_data,
2433							sizeof(pf->fixup_data));
2434					bytes_copied += sizeof(pf->fixup_data);
2435				}
2436				list_del(&pf->node);
2437				kfree(pf);
2438				pf = list_first_entry_or_null(pf_head,
2439						struct binder_ptr_fixup, node);
2440			}
2441		}
2442		list_del(&sgc->node);
2443		kfree(sgc);
2444	}
2445	list_for_each_entry_safe(pf, tmppf, pf_head, node) {
2446		BUG_ON(pf->skip_size == 0);
2447		list_del(&pf->node);
2448		kfree(pf);
2449	}
2450	BUG_ON(!list_empty(sgc_head));
2451
2452	return ret > 0 ? -EINVAL : ret;
2453}
2454
2455/**
2456 * binder_cleanup_deferred_txn_lists() - free specified lists
2457 * @sgc_head:	list_head of scatter-gather copy list
2458 * @pf_head:	list_head of pointer fixup list
2459 *
2460 * Called to clean up @sgc_head and @pf_head if there is an
2461 * error.
2462 */
2463static void binder_cleanup_deferred_txn_lists(struct list_head *sgc_head,
2464					      struct list_head *pf_head)
2465{
2466	struct binder_sg_copy *sgc, *tmpsgc;
2467	struct binder_ptr_fixup *pf, *tmppf;
2468
2469	list_for_each_entry_safe(sgc, tmpsgc, sgc_head, node) {
2470		list_del(&sgc->node);
2471		kfree(sgc);
2472	}
2473	list_for_each_entry_safe(pf, tmppf, pf_head, node) {
2474		list_del(&pf->node);
2475		kfree(pf);
2476	}
2477}
2478
2479/**
2480 * binder_defer_copy() - queue a scatter-gather buffer for copy
2481 * @sgc_head:		list_head of scatter-gather copy list
2482 * @offset:		binder buffer offset in target process
2483 * @sender_uaddr:	user address in source process
2484 * @length:		bytes to copy
2485 *
2486 * Specify a scatter-gather block to be copied. The actual copy must
2487 * be deferred until all the needed fixups are identified and queued.
2488 * Then the copy and fixups are done together so un-translated values
2489 * from the source are never visible in the target buffer.
2490 *
2491 * We are guaranteed that repeated calls to this function will have
2492 * monotonically increasing @offset values so the list will naturally
2493 * be ordered.
2494 *
2495 * Return: 0=success, else -errno
2496 */
2497static int binder_defer_copy(struct list_head *sgc_head, binder_size_t offset,
2498			     const void __user *sender_uaddr, size_t length)
2499{
2500	struct binder_sg_copy *bc = kzalloc(sizeof(*bc), GFP_KERNEL);
2501
2502	if (!bc)
2503		return -ENOMEM;
2504
2505	bc->offset = offset;
2506	bc->sender_uaddr = sender_uaddr;
2507	bc->length = length;
2508	INIT_LIST_HEAD(&bc->node);
2509
2510	/*
2511	 * We are guaranteed that the deferred copies are in-order
2512	 * so just add to the tail.
2513	 */
2514	list_add_tail(&bc->node, sgc_head);
2515
2516	return 0;
2517}
2518
2519/**
2520 * binder_add_fixup() - queue a fixup to be applied to sg copy
2521 * @pf_head:	list_head of binder ptr fixup list
2522 * @offset:	binder buffer offset in target process
2523 * @fixup:	bytes to be copied for fixup
2524 * @skip_size:	bytes to skip when copying (fixup will be applied later)
2525 *
2526 * Add the specified fixup to a list ordered by @offset. When copying
2527 * the scatter-gather buffers, the fixup will be copied instead of
2528 * data from the source buffer. For BINDER_TYPE_FDA fixups, the fixup
2529 * will be applied later (in target process context), so we just skip
2530 * the bytes specified by @skip_size. If @skip_size is 0, we copy the
2531 * value in @fixup.
2532 *
2533 * This function is called *mostly* in @offset order, but there are
2534 * exceptions. Since out-of-order inserts are relatively uncommon,
2535 * we insert the new element by searching backward from the tail of
2536 * the list.
2537 *
2538 * Return: 0=success, else -errno
2539 */
2540static int binder_add_fixup(struct list_head *pf_head, binder_size_t offset,
2541			    binder_uintptr_t fixup, size_t skip_size)
2542{
2543	struct binder_ptr_fixup *pf = kzalloc(sizeof(*pf), GFP_KERNEL);
2544	struct binder_ptr_fixup *tmppf;
2545
2546	if (!pf)
2547		return -ENOMEM;
2548
2549	pf->offset = offset;
2550	pf->fixup_data = fixup;
2551	pf->skip_size = skip_size;
2552	INIT_LIST_HEAD(&pf->node);
2553
2554	/* Fixups are *mostly* added in-order, but there are some
2555	 * exceptions. Look backwards through list for insertion point.
2556	 */
2557	list_for_each_entry_reverse(tmppf, pf_head, node) {
2558		if (tmppf->offset < pf->offset) {
2559			list_add(&pf->node, &tmppf->node);
2560			return 0;
2561		}
2562	}
2563	/*
2564	 * if we get here, then the new offset is the lowest so
2565	 * insert at the head
2566	 */
2567	list_add(&pf->node, pf_head);
2568	return 0;
2569}
2570
2571static int binder_translate_fd_array(struct list_head *pf_head,
2572				     struct binder_fd_array_object *fda,
2573				     const void __user *sender_ubuffer,
2574				     struct binder_buffer_object *parent,
2575				     struct binder_buffer_object *sender_uparent,
2576				     struct binder_transaction *t,
2577				     struct binder_thread *thread,
2578				     struct binder_transaction *in_reply_to)
2579{
2580	binder_size_t fdi, fd_buf_size;
2581	binder_size_t fda_offset;
2582	const void __user *sender_ufda_base;
2583	struct binder_proc *proc = thread->proc;
2584	int ret;
2585
2586	if (fda->num_fds == 0)
2587		return 0;
2588
2589	fd_buf_size = sizeof(u32) * fda->num_fds;
2590	if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
2591		binder_user_error("%d:%d got transaction with invalid number of fds (%lld)\n",
2592				  proc->pid, thread->pid, (u64)fda->num_fds);
2593		return -EINVAL;
2594	}
2595	if (fd_buf_size > parent->length ||
2596	    fda->parent_offset > parent->length - fd_buf_size) {
2597		/* No space for all file descriptors here. */
2598		binder_user_error("%d:%d not enough space to store %lld fds in buffer\n",
2599				  proc->pid, thread->pid, (u64)fda->num_fds);
2600		return -EINVAL;
2601	}
2602	/*
2603	 * the source data for binder_buffer_object is visible
2604	 * to user-space and the @buffer element is the user
2605	 * pointer to the buffer_object containing the fd_array.
2606	 * Convert the address to an offset relative to
2607	 * the base of the transaction buffer.
2608	 */
2609	fda_offset = parent->buffer - t->buffer->user_data +
2610		fda->parent_offset;
2611	sender_ufda_base = (void __user *)(uintptr_t)sender_uparent->buffer +
2612				fda->parent_offset;
2613
2614	if (!IS_ALIGNED((unsigned long)fda_offset, sizeof(u32)) ||
2615	    !IS_ALIGNED((unsigned long)sender_ufda_base, sizeof(u32))) {
2616		binder_user_error("%d:%d parent offset not aligned correctly.\n",
2617				  proc->pid, thread->pid);
2618		return -EINVAL;
2619	}
2620	ret = binder_add_fixup(pf_head, fda_offset, 0, fda->num_fds * sizeof(u32));
2621	if (ret)
2622		return ret;
2623
2624	for (fdi = 0; fdi < fda->num_fds; fdi++) {
2625		u32 fd;
 
2626		binder_size_t offset = fda_offset + fdi * sizeof(fd);
2627		binder_size_t sender_uoffset = fdi * sizeof(fd);
2628
2629		ret = copy_from_user(&fd, sender_ufda_base + sender_uoffset, sizeof(fd));
 
 
2630		if (!ret)
2631			ret = binder_translate_fd(fd, offset, t, thread,
2632						  in_reply_to);
2633		if (ret)
2634			return ret > 0 ? -EINVAL : ret;
2635	}
2636	return 0;
2637}
2638
2639static int binder_fixup_parent(struct list_head *pf_head,
2640			       struct binder_transaction *t,
2641			       struct binder_thread *thread,
2642			       struct binder_buffer_object *bp,
2643			       binder_size_t off_start_offset,
2644			       binder_size_t num_valid,
2645			       binder_size_t last_fixup_obj_off,
2646			       binder_size_t last_fixup_min_off)
2647{
2648	struct binder_buffer_object *parent;
2649	struct binder_buffer *b = t->buffer;
2650	struct binder_proc *proc = thread->proc;
2651	struct binder_proc *target_proc = t->to_proc;
2652	struct binder_object object;
2653	binder_size_t buffer_offset;
2654	binder_size_t parent_offset;
2655
2656	if (!(bp->flags & BINDER_BUFFER_FLAG_HAS_PARENT))
2657		return 0;
2658
2659	parent = binder_validate_ptr(target_proc, b, &object, bp->parent,
2660				     off_start_offset, &parent_offset,
2661				     num_valid);
2662	if (!parent) {
2663		binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
2664				  proc->pid, thread->pid);
2665		return -EINVAL;
2666	}
2667
2668	if (!binder_validate_fixup(target_proc, b, off_start_offset,
2669				   parent_offset, bp->parent_offset,
2670				   last_fixup_obj_off,
2671				   last_fixup_min_off)) {
2672		binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
2673				  proc->pid, thread->pid);
2674		return -EINVAL;
2675	}
2676
2677	if (parent->length < sizeof(binder_uintptr_t) ||
2678	    bp->parent_offset > parent->length - sizeof(binder_uintptr_t)) {
2679		/* No space for a pointer here! */
2680		binder_user_error("%d:%d got transaction with invalid parent offset\n",
2681				  proc->pid, thread->pid);
2682		return -EINVAL;
2683	}
2684
2685	buffer_offset = bp->parent_offset + parent->buffer - b->user_data;
2686
2687	return binder_add_fixup(pf_head, buffer_offset, bp->buffer, 0);
2688}
2689
2690/**
2691 * binder_can_update_transaction() - Can a txn be superseded by an updated one?
2692 * @t1: the pending async txn in the frozen process
2693 * @t2: the new async txn to supersede the outdated pending one
2694 *
2695 * Return:  true if t2 can supersede t1
2696 *          false if t2 can not supersede t1
2697 */
2698static bool binder_can_update_transaction(struct binder_transaction *t1,
2699					  struct binder_transaction *t2)
2700{
2701	if ((t1->flags & t2->flags & (TF_ONE_WAY | TF_UPDATE_TXN)) !=
2702	    (TF_ONE_WAY | TF_UPDATE_TXN) || !t1->to_proc || !t2->to_proc)
2703		return false;
2704	if (t1->to_proc->tsk == t2->to_proc->tsk && t1->code == t2->code &&
2705	    t1->flags == t2->flags && t1->buffer->pid == t2->buffer->pid &&
2706	    t1->buffer->target_node->ptr == t2->buffer->target_node->ptr &&
2707	    t1->buffer->target_node->cookie == t2->buffer->target_node->cookie)
2708		return true;
2709	return false;
2710}
2711
2712/**
2713 * binder_find_outdated_transaction_ilocked() - Find the outdated transaction
2714 * @t:		 new async transaction
2715 * @target_list: list to find outdated transaction
2716 *
2717 * Return: the outdated transaction if found
2718 *         NULL if no outdated transacton can be found
2719 *
2720 * Requires the proc->inner_lock to be held.
2721 */
2722static struct binder_transaction *
2723binder_find_outdated_transaction_ilocked(struct binder_transaction *t,
2724					 struct list_head *target_list)
2725{
2726	struct binder_work *w;
2727
2728	list_for_each_entry(w, target_list, entry) {
2729		struct binder_transaction *t_queued;
2730
2731		if (w->type != BINDER_WORK_TRANSACTION)
2732			continue;
2733		t_queued = container_of(w, struct binder_transaction, work);
2734		if (binder_can_update_transaction(t_queued, t))
2735			return t_queued;
2736	}
2737	return NULL;
 
2738}
2739
2740/**
2741 * binder_proc_transaction() - sends a transaction to a process and wakes it up
2742 * @t:		transaction to send
2743 * @proc:	process to send the transaction to
2744 * @thread:	thread in @proc to send the transaction to (may be NULL)
2745 *
2746 * This function queues a transaction to the specified process. It will try
2747 * to find a thread in the target process to handle the transaction and
2748 * wake it up. If no thread is found, the work is queued to the proc
2749 * waitqueue.
2750 *
2751 * If the @thread parameter is not NULL, the transaction is always queued
2752 * to the waitlist of that specific thread.
2753 *
2754 * Return:	0 if the transaction was successfully queued
2755 *		BR_DEAD_REPLY if the target process or thread is dead
2756 *		BR_FROZEN_REPLY if the target process or thread is frozen and
2757 *			the sync transaction was rejected
2758 *		BR_TRANSACTION_PENDING_FROZEN if the target process is frozen
2759 *		and the async transaction was successfully queued
2760 */
2761static int binder_proc_transaction(struct binder_transaction *t,
2762				    struct binder_proc *proc,
2763				    struct binder_thread *thread)
2764{
2765	struct binder_node *node = t->buffer->target_node;
2766	bool oneway = !!(t->flags & TF_ONE_WAY);
2767	bool pending_async = false;
2768	struct binder_transaction *t_outdated = NULL;
2769	bool frozen = false;
2770
2771	BUG_ON(!node);
2772	binder_node_lock(node);
2773	if (oneway) {
2774		BUG_ON(thread);
2775		if (node->has_async_transaction)
2776			pending_async = true;
2777		else
2778			node->has_async_transaction = true;
 
2779	}
2780
2781	binder_inner_proc_lock(proc);
2782	if (proc->is_frozen) {
2783		frozen = true;
2784		proc->sync_recv |= !oneway;
2785		proc->async_recv |= oneway;
2786	}
2787
2788	if ((frozen && !oneway) || proc->is_dead ||
2789			(thread && thread->is_dead)) {
2790		binder_inner_proc_unlock(proc);
2791		binder_node_unlock(node);
2792		return frozen ? BR_FROZEN_REPLY : BR_DEAD_REPLY;
2793	}
2794
2795	if (!thread && !pending_async)
2796		thread = binder_select_thread_ilocked(proc);
2797
2798	if (thread) {
2799		binder_enqueue_thread_work_ilocked(thread, &t->work);
2800	} else if (!pending_async) {
2801		binder_enqueue_work_ilocked(&t->work, &proc->todo);
2802	} else {
2803		if ((t->flags & TF_UPDATE_TXN) && frozen) {
2804			t_outdated = binder_find_outdated_transaction_ilocked(t,
2805									      &node->async_todo);
2806			if (t_outdated) {
2807				binder_debug(BINDER_DEBUG_TRANSACTION,
2808					     "txn %d supersedes %d\n",
2809					     t->debug_id, t_outdated->debug_id);
2810				list_del_init(&t_outdated->work.entry);
2811				proc->outstanding_txns--;
2812			}
2813		}
2814		binder_enqueue_work_ilocked(&t->work, &node->async_todo);
2815	}
2816
2817	if (!pending_async)
2818		binder_wakeup_thread_ilocked(proc, thread, !oneway /* sync */);
2819
2820	proc->outstanding_txns++;
2821	binder_inner_proc_unlock(proc);
2822	binder_node_unlock(node);
2823
2824	/*
2825	 * To reduce potential contention, free the outdated transaction and
2826	 * buffer after releasing the locks.
2827	 */
2828	if (t_outdated) {
2829		struct binder_buffer *buffer = t_outdated->buffer;
2830
2831		t_outdated->buffer = NULL;
2832		buffer->transaction = NULL;
2833		trace_binder_transaction_update_buffer_release(buffer);
2834		binder_release_entire_buffer(proc, NULL, buffer, false);
2835		binder_alloc_free_buf(&proc->alloc, buffer);
2836		kfree(t_outdated);
2837		binder_stats_deleted(BINDER_STAT_TRANSACTION);
2838	}
2839
2840	if (oneway && frozen)
2841		return BR_TRANSACTION_PENDING_FROZEN;
2842
2843	return 0;
2844}
2845
2846/**
2847 * binder_get_node_refs_for_txn() - Get required refs on node for txn
2848 * @node:         struct binder_node for which to get refs
2849 * @procp:        returns @node->proc if valid
2850 * @error:        if no @procp then returns BR_DEAD_REPLY
2851 *
2852 * User-space normally keeps the node alive when creating a transaction
2853 * since it has a reference to the target. The local strong ref keeps it
2854 * alive if the sending process dies before the target process processes
2855 * the transaction. If the source process is malicious or has a reference
2856 * counting bug, relying on the local strong ref can fail.
2857 *
2858 * Since user-space can cause the local strong ref to go away, we also take
2859 * a tmpref on the node to ensure it survives while we are constructing
2860 * the transaction. We also need a tmpref on the proc while we are
2861 * constructing the transaction, so we take that here as well.
2862 *
2863 * Return: The target_node with refs taken or NULL if no @node->proc is NULL.
2864 * Also sets @procp if valid. If the @node->proc is NULL indicating that the
2865 * target proc has died, @error is set to BR_DEAD_REPLY.
2866 */
2867static struct binder_node *binder_get_node_refs_for_txn(
2868		struct binder_node *node,
2869		struct binder_proc **procp,
2870		uint32_t *error)
2871{
2872	struct binder_node *target_node = NULL;
2873
2874	binder_node_inner_lock(node);
2875	if (node->proc) {
2876		target_node = node;
2877		binder_inc_node_nilocked(node, 1, 0, NULL);
2878		binder_inc_node_tmpref_ilocked(node);
2879		node->proc->tmp_ref++;
2880		*procp = node->proc;
2881	} else
2882		*error = BR_DEAD_REPLY;
2883	binder_node_inner_unlock(node);
2884
2885	return target_node;
2886}
2887
2888static void binder_set_txn_from_error(struct binder_transaction *t, int id,
2889				      uint32_t command, int32_t param)
2890{
2891	struct binder_thread *from = binder_get_txn_from_and_acq_inner(t);
2892
2893	if (!from) {
2894		/* annotation for sparse */
2895		__release(&from->proc->inner_lock);
2896		return;
2897	}
2898
2899	/* don't override existing errors */
2900	if (from->ee.command == BR_OK)
2901		binder_set_extended_error(&from->ee, id, command, param);
2902	binder_inner_proc_unlock(from->proc);
2903	binder_thread_dec_tmpref(from);
2904}
2905
2906static void binder_transaction(struct binder_proc *proc,
2907			       struct binder_thread *thread,
2908			       struct binder_transaction_data *tr, int reply,
2909			       binder_size_t extra_buffers_size)
2910{
2911	int ret;
2912	struct binder_transaction *t;
2913	struct binder_work *w;
2914	struct binder_work *tcomplete;
2915	binder_size_t buffer_offset = 0;
2916	binder_size_t off_start_offset, off_end_offset;
2917	binder_size_t off_min;
2918	binder_size_t sg_buf_offset, sg_buf_end_offset;
2919	binder_size_t user_offset = 0;
2920	struct binder_proc *target_proc = NULL;
2921	struct binder_thread *target_thread = NULL;
2922	struct binder_node *target_node = NULL;
2923	struct binder_transaction *in_reply_to = NULL;
2924	struct binder_transaction_log_entry *e;
2925	uint32_t return_error = 0;
2926	uint32_t return_error_param = 0;
2927	uint32_t return_error_line = 0;
2928	binder_size_t last_fixup_obj_off = 0;
2929	binder_size_t last_fixup_min_off = 0;
2930	struct binder_context *context = proc->context;
2931	int t_debug_id = atomic_inc_return(&binder_last_id);
2932	ktime_t t_start_time = ktime_get();
2933	char *secctx = NULL;
2934	u32 secctx_sz = 0;
2935	struct list_head sgc_head;
2936	struct list_head pf_head;
2937	const void __user *user_buffer = (const void __user *)
2938				(uintptr_t)tr->data.ptr.buffer;
2939	INIT_LIST_HEAD(&sgc_head);
2940	INIT_LIST_HEAD(&pf_head);
2941
2942	e = binder_transaction_log_add(&binder_transaction_log);
2943	e->debug_id = t_debug_id;
2944	e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
2945	e->from_proc = proc->pid;
2946	e->from_thread = thread->pid;
2947	e->target_handle = tr->target.handle;
2948	e->data_size = tr->data_size;
2949	e->offsets_size = tr->offsets_size;
2950	strscpy(e->context_name, proc->context->name, BINDERFS_MAX_NAME);
2951
2952	binder_inner_proc_lock(proc);
2953	binder_set_extended_error(&thread->ee, t_debug_id, BR_OK, 0);
2954	binder_inner_proc_unlock(proc);
2955
2956	if (reply) {
2957		binder_inner_proc_lock(proc);
2958		in_reply_to = thread->transaction_stack;
2959		if (in_reply_to == NULL) {
2960			binder_inner_proc_unlock(proc);
2961			binder_user_error("%d:%d got reply transaction with no transaction stack\n",
2962					  proc->pid, thread->pid);
2963			return_error = BR_FAILED_REPLY;
2964			return_error_param = -EPROTO;
2965			return_error_line = __LINE__;
2966			goto err_empty_call_stack;
2967		}
2968		if (in_reply_to->to_thread != thread) {
2969			spin_lock(&in_reply_to->lock);
2970			binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
2971				proc->pid, thread->pid, in_reply_to->debug_id,
2972				in_reply_to->to_proc ?
2973				in_reply_to->to_proc->pid : 0,
2974				in_reply_to->to_thread ?
2975				in_reply_to->to_thread->pid : 0);
2976			spin_unlock(&in_reply_to->lock);
2977			binder_inner_proc_unlock(proc);
2978			return_error = BR_FAILED_REPLY;
2979			return_error_param = -EPROTO;
2980			return_error_line = __LINE__;
2981			in_reply_to = NULL;
2982			goto err_bad_call_stack;
2983		}
2984		thread->transaction_stack = in_reply_to->to_parent;
2985		binder_inner_proc_unlock(proc);
2986		binder_set_nice(in_reply_to->saved_priority);
2987		target_thread = binder_get_txn_from_and_acq_inner(in_reply_to);
2988		if (target_thread == NULL) {
2989			/* annotation for sparse */
2990			__release(&target_thread->proc->inner_lock);
2991			binder_txn_error("%d:%d reply target not found\n",
2992				thread->pid, proc->pid);
2993			return_error = BR_DEAD_REPLY;
2994			return_error_line = __LINE__;
2995			goto err_dead_binder;
2996		}
2997		if (target_thread->transaction_stack != in_reply_to) {
2998			binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
2999				proc->pid, thread->pid,
3000				target_thread->transaction_stack ?
3001				target_thread->transaction_stack->debug_id : 0,
3002				in_reply_to->debug_id);
3003			binder_inner_proc_unlock(target_thread->proc);
3004			return_error = BR_FAILED_REPLY;
3005			return_error_param = -EPROTO;
3006			return_error_line = __LINE__;
3007			in_reply_to = NULL;
3008			target_thread = NULL;
3009			goto err_dead_binder;
3010		}
3011		target_proc = target_thread->proc;
3012		target_proc->tmp_ref++;
3013		binder_inner_proc_unlock(target_thread->proc);
3014	} else {
3015		if (tr->target.handle) {
3016			struct binder_ref *ref;
3017
3018			/*
3019			 * There must already be a strong ref
3020			 * on this node. If so, do a strong
3021			 * increment on the node to ensure it
3022			 * stays alive until the transaction is
3023			 * done.
3024			 */
3025			binder_proc_lock(proc);
3026			ref = binder_get_ref_olocked(proc, tr->target.handle,
3027						     true);
3028			if (ref) {
3029				target_node = binder_get_node_refs_for_txn(
3030						ref->node, &target_proc,
3031						&return_error);
3032			} else {
3033				binder_user_error("%d:%d got transaction to invalid handle, %u\n",
3034						  proc->pid, thread->pid, tr->target.handle);
3035				return_error = BR_FAILED_REPLY;
3036			}
3037			binder_proc_unlock(proc);
3038		} else {
3039			mutex_lock(&context->context_mgr_node_lock);
3040			target_node = context->binder_context_mgr_node;
3041			if (target_node)
3042				target_node = binder_get_node_refs_for_txn(
3043						target_node, &target_proc,
3044						&return_error);
3045			else
3046				return_error = BR_DEAD_REPLY;
3047			mutex_unlock(&context->context_mgr_node_lock);
3048			if (target_node && target_proc->pid == proc->pid) {
3049				binder_user_error("%d:%d got transaction to context manager from process owning it\n",
3050						  proc->pid, thread->pid);
3051				return_error = BR_FAILED_REPLY;
3052				return_error_param = -EINVAL;
3053				return_error_line = __LINE__;
3054				goto err_invalid_target_handle;
3055			}
3056		}
3057		if (!target_node) {
3058			binder_txn_error("%d:%d cannot find target node\n",
3059				thread->pid, proc->pid);
3060			/*
3061			 * return_error is set above
3062			 */
3063			return_error_param = -EINVAL;
3064			return_error_line = __LINE__;
3065			goto err_dead_binder;
3066		}
3067		e->to_node = target_node->debug_id;
3068		if (WARN_ON(proc == target_proc)) {
3069			binder_txn_error("%d:%d self transactions not allowed\n",
3070				thread->pid, proc->pid);
3071			return_error = BR_FAILED_REPLY;
3072			return_error_param = -EINVAL;
3073			return_error_line = __LINE__;
3074			goto err_invalid_target_handle;
3075		}
3076		if (security_binder_transaction(proc->cred,
3077						target_proc->cred) < 0) {
3078			binder_txn_error("%d:%d transaction credentials failed\n",
3079				thread->pid, proc->pid);
3080			return_error = BR_FAILED_REPLY;
3081			return_error_param = -EPERM;
3082			return_error_line = __LINE__;
3083			goto err_invalid_target_handle;
3084		}
3085		binder_inner_proc_lock(proc);
3086
3087		w = list_first_entry_or_null(&thread->todo,
3088					     struct binder_work, entry);
3089		if (!(tr->flags & TF_ONE_WAY) && w &&
3090		    w->type == BINDER_WORK_TRANSACTION) {
3091			/*
3092			 * Do not allow new outgoing transaction from a
3093			 * thread that has a transaction at the head of
3094			 * its todo list. Only need to check the head
3095			 * because binder_select_thread_ilocked picks a
3096			 * thread from proc->waiting_threads to enqueue
3097			 * the transaction, and nothing is queued to the
3098			 * todo list while the thread is on waiting_threads.
3099			 */
3100			binder_user_error("%d:%d new transaction not allowed when there is a transaction on thread todo\n",
3101					  proc->pid, thread->pid);
3102			binder_inner_proc_unlock(proc);
3103			return_error = BR_FAILED_REPLY;
3104			return_error_param = -EPROTO;
3105			return_error_line = __LINE__;
3106			goto err_bad_todo_list;
3107		}
3108
3109		if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
3110			struct binder_transaction *tmp;
3111
3112			tmp = thread->transaction_stack;
3113			if (tmp->to_thread != thread) {
3114				spin_lock(&tmp->lock);
3115				binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
3116					proc->pid, thread->pid, tmp->debug_id,
3117					tmp->to_proc ? tmp->to_proc->pid : 0,
3118					tmp->to_thread ?
3119					tmp->to_thread->pid : 0);
3120				spin_unlock(&tmp->lock);
3121				binder_inner_proc_unlock(proc);
3122				return_error = BR_FAILED_REPLY;
3123				return_error_param = -EPROTO;
3124				return_error_line = __LINE__;
3125				goto err_bad_call_stack;
3126			}
3127			while (tmp) {
3128				struct binder_thread *from;
3129
3130				spin_lock(&tmp->lock);
3131				from = tmp->from;
3132				if (from && from->proc == target_proc) {
3133					atomic_inc(&from->tmp_ref);
3134					target_thread = from;
3135					spin_unlock(&tmp->lock);
3136					break;
3137				}
3138				spin_unlock(&tmp->lock);
3139				tmp = tmp->from_parent;
3140			}
3141		}
3142		binder_inner_proc_unlock(proc);
3143	}
3144	if (target_thread)
3145		e->to_thread = target_thread->pid;
3146	e->to_proc = target_proc->pid;
3147
3148	/* TODO: reuse incoming transaction for reply */
3149	t = kzalloc(sizeof(*t), GFP_KERNEL);
3150	if (t == NULL) {
3151		binder_txn_error("%d:%d cannot allocate transaction\n",
3152			thread->pid, proc->pid);
3153		return_error = BR_FAILED_REPLY;
3154		return_error_param = -ENOMEM;
3155		return_error_line = __LINE__;
3156		goto err_alloc_t_failed;
3157	}
3158	INIT_LIST_HEAD(&t->fd_fixups);
3159	binder_stats_created(BINDER_STAT_TRANSACTION);
3160	spin_lock_init(&t->lock);
3161
3162	tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
3163	if (tcomplete == NULL) {
3164		binder_txn_error("%d:%d cannot allocate work for transaction\n",
3165			thread->pid, proc->pid);
3166		return_error = BR_FAILED_REPLY;
3167		return_error_param = -ENOMEM;
3168		return_error_line = __LINE__;
3169		goto err_alloc_tcomplete_failed;
3170	}
3171	binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
3172
3173	t->debug_id = t_debug_id;
3174	t->start_time = t_start_time;
3175
3176	if (reply)
3177		binder_debug(BINDER_DEBUG_TRANSACTION,
3178			     "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld-%lld\n",
3179			     proc->pid, thread->pid, t->debug_id,
3180			     target_proc->pid, target_thread->pid,
3181			     (u64)tr->data.ptr.buffer,
3182			     (u64)tr->data.ptr.offsets,
3183			     (u64)tr->data_size, (u64)tr->offsets_size,
3184			     (u64)extra_buffers_size);
3185	else
3186		binder_debug(BINDER_DEBUG_TRANSACTION,
3187			     "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld-%lld\n",
3188			     proc->pid, thread->pid, t->debug_id,
3189			     target_proc->pid, target_node->debug_id,
3190			     (u64)tr->data.ptr.buffer,
3191			     (u64)tr->data.ptr.offsets,
3192			     (u64)tr->data_size, (u64)tr->offsets_size,
3193			     (u64)extra_buffers_size);
3194
3195	if (!reply && !(tr->flags & TF_ONE_WAY))
3196		t->from = thread;
3197	else
3198		t->from = NULL;
3199	t->from_pid = proc->pid;
3200	t->from_tid = thread->pid;
3201	t->sender_euid = task_euid(proc->tsk);
3202	t->to_proc = target_proc;
3203	t->to_thread = target_thread;
3204	t->code = tr->code;
3205	t->flags = tr->flags;
3206	t->priority = task_nice(current);
3207
3208	if (target_node && target_node->txn_security_ctx) {
3209		u32 secid;
3210		size_t added_size;
3211
3212		security_cred_getsecid(proc->cred, &secid);
3213		ret = security_secid_to_secctx(secid, &secctx, &secctx_sz);
3214		if (ret) {
3215			binder_txn_error("%d:%d failed to get security context\n",
3216				thread->pid, proc->pid);
3217			return_error = BR_FAILED_REPLY;
3218			return_error_param = ret;
3219			return_error_line = __LINE__;
3220			goto err_get_secctx_failed;
3221		}
3222		added_size = ALIGN(secctx_sz, sizeof(u64));
3223		extra_buffers_size += added_size;
3224		if (extra_buffers_size < added_size) {
3225			binder_txn_error("%d:%d integer overflow of extra_buffers_size\n",
3226				thread->pid, proc->pid);
3227			return_error = BR_FAILED_REPLY;
3228			return_error_param = -EINVAL;
3229			return_error_line = __LINE__;
3230			goto err_bad_extra_size;
3231		}
3232	}
3233
3234	trace_binder_transaction(reply, t, target_node);
3235
3236	t->buffer = binder_alloc_new_buf(&target_proc->alloc, tr->data_size,
3237		tr->offsets_size, extra_buffers_size,
3238		!reply && (t->flags & TF_ONE_WAY));
3239	if (IS_ERR(t->buffer)) {
3240		char *s;
3241
3242		ret = PTR_ERR(t->buffer);
3243		s = (ret == -ESRCH) ? ": vma cleared, target dead or dying"
3244			: (ret == -ENOSPC) ? ": no space left"
3245			: (ret == -ENOMEM) ? ": memory allocation failed"
3246			: "";
3247		binder_txn_error("cannot allocate buffer%s", s);
3248
3249		return_error_param = PTR_ERR(t->buffer);
3250		return_error = return_error_param == -ESRCH ?
3251			BR_DEAD_REPLY : BR_FAILED_REPLY;
3252		return_error_line = __LINE__;
3253		t->buffer = NULL;
3254		goto err_binder_alloc_buf_failed;
3255	}
3256	if (secctx) {
3257		int err;
3258		size_t buf_offset = ALIGN(tr->data_size, sizeof(void *)) +
3259				    ALIGN(tr->offsets_size, sizeof(void *)) +
3260				    ALIGN(extra_buffers_size, sizeof(void *)) -
3261				    ALIGN(secctx_sz, sizeof(u64));
3262
3263		t->security_ctx = t->buffer->user_data + buf_offset;
3264		err = binder_alloc_copy_to_buffer(&target_proc->alloc,
3265						  t->buffer, buf_offset,
3266						  secctx, secctx_sz);
3267		if (err) {
3268			t->security_ctx = 0;
3269			WARN_ON(1);
3270		}
3271		security_release_secctx(secctx, secctx_sz);
3272		secctx = NULL;
3273	}
3274	t->buffer->debug_id = t->debug_id;
3275	t->buffer->transaction = t;
3276	t->buffer->target_node = target_node;
3277	t->buffer->clear_on_free = !!(t->flags & TF_CLEAR_BUF);
3278	trace_binder_transaction_alloc_buf(t->buffer);
3279
3280	if (binder_alloc_copy_user_to_buffer(
3281				&target_proc->alloc,
 
 
 
 
 
 
 
 
 
 
 
 
 
3282				t->buffer,
3283				ALIGN(tr->data_size, sizeof(void *)),
3284				(const void __user *)
3285					(uintptr_t)tr->data.ptr.offsets,
3286				tr->offsets_size)) {
3287		binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
3288				proc->pid, thread->pid);
3289		return_error = BR_FAILED_REPLY;
3290		return_error_param = -EFAULT;
3291		return_error_line = __LINE__;
3292		goto err_copy_data_failed;
3293	}
3294	if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
3295		binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
3296				proc->pid, thread->pid, (u64)tr->offsets_size);
3297		return_error = BR_FAILED_REPLY;
3298		return_error_param = -EINVAL;
3299		return_error_line = __LINE__;
3300		goto err_bad_offset;
3301	}
3302	if (!IS_ALIGNED(extra_buffers_size, sizeof(u64))) {
3303		binder_user_error("%d:%d got transaction with unaligned buffers size, %lld\n",
3304				  proc->pid, thread->pid,
3305				  (u64)extra_buffers_size);
3306		return_error = BR_FAILED_REPLY;
3307		return_error_param = -EINVAL;
3308		return_error_line = __LINE__;
3309		goto err_bad_offset;
3310	}
3311	off_start_offset = ALIGN(tr->data_size, sizeof(void *));
3312	buffer_offset = off_start_offset;
3313	off_end_offset = off_start_offset + tr->offsets_size;
3314	sg_buf_offset = ALIGN(off_end_offset, sizeof(void *));
3315	sg_buf_end_offset = sg_buf_offset + extra_buffers_size -
3316		ALIGN(secctx_sz, sizeof(u64));
3317	off_min = 0;
3318	for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
3319	     buffer_offset += sizeof(binder_size_t)) {
3320		struct binder_object_header *hdr;
3321		size_t object_size;
3322		struct binder_object object;
3323		binder_size_t object_offset;
3324		binder_size_t copy_size;
3325
3326		if (binder_alloc_copy_from_buffer(&target_proc->alloc,
3327						  &object_offset,
3328						  t->buffer,
3329						  buffer_offset,
3330						  sizeof(object_offset))) {
3331			binder_txn_error("%d:%d copy offset from buffer failed\n",
3332				thread->pid, proc->pid);
3333			return_error = BR_FAILED_REPLY;
3334			return_error_param = -EINVAL;
3335			return_error_line = __LINE__;
3336			goto err_bad_offset;
3337		}
3338
3339		/*
3340		 * Copy the source user buffer up to the next object
3341		 * that will be processed.
3342		 */
3343		copy_size = object_offset - user_offset;
3344		if (copy_size && (user_offset > object_offset ||
3345				binder_alloc_copy_user_to_buffer(
3346					&target_proc->alloc,
3347					t->buffer, user_offset,
3348					user_buffer + user_offset,
3349					copy_size))) {
3350			binder_user_error("%d:%d got transaction with invalid data ptr\n",
3351					proc->pid, thread->pid);
3352			return_error = BR_FAILED_REPLY;
3353			return_error_param = -EFAULT;
3354			return_error_line = __LINE__;
3355			goto err_copy_data_failed;
3356		}
3357		object_size = binder_get_object(target_proc, user_buffer,
3358				t->buffer, object_offset, &object);
3359		if (object_size == 0 || object_offset < off_min) {
3360			binder_user_error("%d:%d got transaction with invalid offset (%lld, min %lld max %lld) or object.\n",
3361					  proc->pid, thread->pid,
3362					  (u64)object_offset,
3363					  (u64)off_min,
3364					  (u64)t->buffer->data_size);
3365			return_error = BR_FAILED_REPLY;
3366			return_error_param = -EINVAL;
3367			return_error_line = __LINE__;
3368			goto err_bad_offset;
3369		}
3370		/*
3371		 * Set offset to the next buffer fragment to be
3372		 * copied
3373		 */
3374		user_offset = object_offset + object_size;
3375
3376		hdr = &object.hdr;
3377		off_min = object_offset + object_size;
3378		switch (hdr->type) {
3379		case BINDER_TYPE_BINDER:
3380		case BINDER_TYPE_WEAK_BINDER: {
3381			struct flat_binder_object *fp;
3382
3383			fp = to_flat_binder_object(hdr);
3384			ret = binder_translate_binder(fp, t, thread);
3385
3386			if (ret < 0 ||
3387			    binder_alloc_copy_to_buffer(&target_proc->alloc,
3388							t->buffer,
3389							object_offset,
3390							fp, sizeof(*fp))) {
3391				binder_txn_error("%d:%d translate binder failed\n",
3392					thread->pid, proc->pid);
3393				return_error = BR_FAILED_REPLY;
3394				return_error_param = ret;
3395				return_error_line = __LINE__;
3396				goto err_translate_failed;
3397			}
3398		} break;
3399		case BINDER_TYPE_HANDLE:
3400		case BINDER_TYPE_WEAK_HANDLE: {
3401			struct flat_binder_object *fp;
3402
3403			fp = to_flat_binder_object(hdr);
3404			ret = binder_translate_handle(fp, t, thread);
3405			if (ret < 0 ||
3406			    binder_alloc_copy_to_buffer(&target_proc->alloc,
3407							t->buffer,
3408							object_offset,
3409							fp, sizeof(*fp))) {
3410				binder_txn_error("%d:%d translate handle failed\n",
3411					thread->pid, proc->pid);
3412				return_error = BR_FAILED_REPLY;
3413				return_error_param = ret;
3414				return_error_line = __LINE__;
3415				goto err_translate_failed;
3416			}
3417		} break;
3418
3419		case BINDER_TYPE_FD: {
3420			struct binder_fd_object *fp = to_binder_fd_object(hdr);
3421			binder_size_t fd_offset = object_offset +
3422				(uintptr_t)&fp->fd - (uintptr_t)fp;
3423			int ret = binder_translate_fd(fp->fd, fd_offset, t,
3424						      thread, in_reply_to);
3425
3426			fp->pad_binder = 0;
3427			if (ret < 0 ||
3428			    binder_alloc_copy_to_buffer(&target_proc->alloc,
3429							t->buffer,
3430							object_offset,
3431							fp, sizeof(*fp))) {
3432				binder_txn_error("%d:%d translate fd failed\n",
3433					thread->pid, proc->pid);
3434				return_error = BR_FAILED_REPLY;
3435				return_error_param = ret;
3436				return_error_line = __LINE__;
3437				goto err_translate_failed;
3438			}
3439		} break;
3440		case BINDER_TYPE_FDA: {
3441			struct binder_object ptr_object;
3442			binder_size_t parent_offset;
3443			struct binder_object user_object;
3444			size_t user_parent_size;
3445			struct binder_fd_array_object *fda =
3446				to_binder_fd_array_object(hdr);
3447			size_t num_valid = (buffer_offset - off_start_offset) /
3448						sizeof(binder_size_t);
3449			struct binder_buffer_object *parent =
3450				binder_validate_ptr(target_proc, t->buffer,
3451						    &ptr_object, fda->parent,
3452						    off_start_offset,
3453						    &parent_offset,
3454						    num_valid);
3455			if (!parent) {
3456				binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
3457						  proc->pid, thread->pid);
3458				return_error = BR_FAILED_REPLY;
3459				return_error_param = -EINVAL;
3460				return_error_line = __LINE__;
3461				goto err_bad_parent;
3462			}
3463			if (!binder_validate_fixup(target_proc, t->buffer,
3464						   off_start_offset,
3465						   parent_offset,
3466						   fda->parent_offset,
3467						   last_fixup_obj_off,
3468						   last_fixup_min_off)) {
3469				binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
3470						  proc->pid, thread->pid);
3471				return_error = BR_FAILED_REPLY;
3472				return_error_param = -EINVAL;
3473				return_error_line = __LINE__;
3474				goto err_bad_parent;
3475			}
3476			/*
3477			 * We need to read the user version of the parent
3478			 * object to get the original user offset
3479			 */
3480			user_parent_size =
3481				binder_get_object(proc, user_buffer, t->buffer,
3482						  parent_offset, &user_object);
3483			if (user_parent_size != sizeof(user_object.bbo)) {
3484				binder_user_error("%d:%d invalid ptr object size: %zd vs %zd\n",
3485						  proc->pid, thread->pid,
3486						  user_parent_size,
3487						  sizeof(user_object.bbo));
3488				return_error = BR_FAILED_REPLY;
3489				return_error_param = -EINVAL;
3490				return_error_line = __LINE__;
3491				goto err_bad_parent;
3492			}
3493			ret = binder_translate_fd_array(&pf_head, fda,
3494							user_buffer, parent,
3495							&user_object.bbo, t,
3496							thread, in_reply_to);
3497			if (!ret)
3498				ret = binder_alloc_copy_to_buffer(&target_proc->alloc,
3499								  t->buffer,
3500								  object_offset,
3501								  fda, sizeof(*fda));
3502			if (ret) {
3503				binder_txn_error("%d:%d translate fd array failed\n",
3504					thread->pid, proc->pid);
3505				return_error = BR_FAILED_REPLY;
3506				return_error_param = ret > 0 ? -EINVAL : ret;
3507				return_error_line = __LINE__;
3508				goto err_translate_failed;
3509			}
3510			last_fixup_obj_off = parent_offset;
3511			last_fixup_min_off =
3512				fda->parent_offset + sizeof(u32) * fda->num_fds;
3513		} break;
3514		case BINDER_TYPE_PTR: {
3515			struct binder_buffer_object *bp =
3516				to_binder_buffer_object(hdr);
3517			size_t buf_left = sg_buf_end_offset - sg_buf_offset;
3518			size_t num_valid;
3519
3520			if (bp->length > buf_left) {
3521				binder_user_error("%d:%d got transaction with too large buffer\n",
3522						  proc->pid, thread->pid);
3523				return_error = BR_FAILED_REPLY;
3524				return_error_param = -EINVAL;
3525				return_error_line = __LINE__;
3526				goto err_bad_offset;
3527			}
3528			ret = binder_defer_copy(&sgc_head, sg_buf_offset,
3529				(const void __user *)(uintptr_t)bp->buffer,
3530				bp->length);
3531			if (ret) {
3532				binder_txn_error("%d:%d deferred copy failed\n",
3533					thread->pid, proc->pid);
 
 
 
 
3534				return_error = BR_FAILED_REPLY;
3535				return_error_param = ret;
3536				return_error_line = __LINE__;
3537				goto err_translate_failed;
3538			}
3539			/* Fixup buffer pointer to target proc address space */
3540			bp->buffer = t->buffer->user_data + sg_buf_offset;
 
3541			sg_buf_offset += ALIGN(bp->length, sizeof(u64));
3542
3543			num_valid = (buffer_offset - off_start_offset) /
3544					sizeof(binder_size_t);
3545			ret = binder_fixup_parent(&pf_head, t,
3546						  thread, bp,
3547						  off_start_offset,
3548						  num_valid,
3549						  last_fixup_obj_off,
3550						  last_fixup_min_off);
3551			if (ret < 0 ||
3552			    binder_alloc_copy_to_buffer(&target_proc->alloc,
3553							t->buffer,
3554							object_offset,
3555							bp, sizeof(*bp))) {
3556				binder_txn_error("%d:%d failed to fixup parent\n",
3557					thread->pid, proc->pid);
3558				return_error = BR_FAILED_REPLY;
3559				return_error_param = ret;
3560				return_error_line = __LINE__;
3561				goto err_translate_failed;
3562			}
3563			last_fixup_obj_off = object_offset;
3564			last_fixup_min_off = 0;
3565		} break;
3566		default:
3567			binder_user_error("%d:%d got transaction with invalid object type, %x\n",
3568				proc->pid, thread->pid, hdr->type);
3569			return_error = BR_FAILED_REPLY;
3570			return_error_param = -EINVAL;
3571			return_error_line = __LINE__;
3572			goto err_bad_object_type;
3573		}
3574	}
3575	/* Done processing objects, copy the rest of the buffer */
3576	if (binder_alloc_copy_user_to_buffer(
3577				&target_proc->alloc,
3578				t->buffer, user_offset,
3579				user_buffer + user_offset,
3580				tr->data_size - user_offset)) {
3581		binder_user_error("%d:%d got transaction with invalid data ptr\n",
3582				proc->pid, thread->pid);
3583		return_error = BR_FAILED_REPLY;
3584		return_error_param = -EFAULT;
3585		return_error_line = __LINE__;
3586		goto err_copy_data_failed;
3587	}
3588
3589	ret = binder_do_deferred_txn_copies(&target_proc->alloc, t->buffer,
3590					    &sgc_head, &pf_head);
3591	if (ret) {
3592		binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
3593				  proc->pid, thread->pid);
3594		return_error = BR_FAILED_REPLY;
3595		return_error_param = ret;
3596		return_error_line = __LINE__;
3597		goto err_copy_data_failed;
3598	}
3599	if (t->buffer->oneway_spam_suspect)
3600		tcomplete->type = BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT;
3601	else
3602		tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
3603	t->work.type = BINDER_WORK_TRANSACTION;
3604
3605	if (reply) {
3606		binder_enqueue_thread_work(thread, tcomplete);
3607		binder_inner_proc_lock(target_proc);
3608		if (target_thread->is_dead) {
3609			return_error = BR_DEAD_REPLY;
3610			binder_inner_proc_unlock(target_proc);
3611			goto err_dead_proc_or_thread;
3612		}
3613		BUG_ON(t->buffer->async_transaction != 0);
3614		binder_pop_transaction_ilocked(target_thread, in_reply_to);
3615		binder_enqueue_thread_work_ilocked(target_thread, &t->work);
3616		target_proc->outstanding_txns++;
3617		binder_inner_proc_unlock(target_proc);
3618		wake_up_interruptible_sync(&target_thread->wait);
3619		binder_free_transaction(in_reply_to);
3620	} else if (!(t->flags & TF_ONE_WAY)) {
3621		BUG_ON(t->buffer->async_transaction != 0);
3622		binder_inner_proc_lock(proc);
3623		/*
3624		 * Defer the TRANSACTION_COMPLETE, so we don't return to
3625		 * userspace immediately; this allows the target process to
3626		 * immediately start processing this transaction, reducing
3627		 * latency. We will then return the TRANSACTION_COMPLETE when
3628		 * the target replies (or there is an error).
3629		 */
3630		binder_enqueue_deferred_thread_work_ilocked(thread, tcomplete);
3631		t->need_reply = 1;
3632		t->from_parent = thread->transaction_stack;
3633		thread->transaction_stack = t;
3634		binder_inner_proc_unlock(proc);
3635		return_error = binder_proc_transaction(t,
3636				target_proc, target_thread);
3637		if (return_error) {
3638			binder_inner_proc_lock(proc);
3639			binder_pop_transaction_ilocked(thread, t);
3640			binder_inner_proc_unlock(proc);
3641			goto err_dead_proc_or_thread;
3642		}
3643	} else {
3644		BUG_ON(target_node == NULL);
3645		BUG_ON(t->buffer->async_transaction != 1);
3646		return_error = binder_proc_transaction(t, target_proc, NULL);
3647		/*
3648		 * Let the caller know when async transaction reaches a frozen
3649		 * process and is put in a pending queue, waiting for the target
3650		 * process to be unfrozen.
3651		 */
3652		if (return_error == BR_TRANSACTION_PENDING_FROZEN)
3653			tcomplete->type = BINDER_WORK_TRANSACTION_PENDING;
3654		binder_enqueue_thread_work(thread, tcomplete);
3655		if (return_error &&
3656		    return_error != BR_TRANSACTION_PENDING_FROZEN)
3657			goto err_dead_proc_or_thread;
3658	}
3659	if (target_thread)
3660		binder_thread_dec_tmpref(target_thread);
3661	binder_proc_dec_tmpref(target_proc);
3662	if (target_node)
3663		binder_dec_node_tmpref(target_node);
3664	/*
3665	 * write barrier to synchronize with initialization
3666	 * of log entry
3667	 */
3668	smp_wmb();
3669	WRITE_ONCE(e->debug_id_done, t_debug_id);
3670	return;
3671
3672err_dead_proc_or_thread:
3673	binder_txn_error("%d:%d dead process or thread\n",
3674		thread->pid, proc->pid);
3675	return_error_line = __LINE__;
3676	binder_dequeue_work(proc, tcomplete);
3677err_translate_failed:
3678err_bad_object_type:
3679err_bad_offset:
3680err_bad_parent:
3681err_copy_data_failed:
3682	binder_cleanup_deferred_txn_lists(&sgc_head, &pf_head);
3683	binder_free_txn_fixups(t);
3684	trace_binder_transaction_failed_buffer_release(t->buffer);
3685	binder_transaction_buffer_release(target_proc, NULL, t->buffer,
3686					  buffer_offset, true);
3687	if (target_node)
3688		binder_dec_node_tmpref(target_node);
3689	target_node = NULL;
3690	t->buffer->transaction = NULL;
3691	binder_alloc_free_buf(&target_proc->alloc, t->buffer);
3692err_binder_alloc_buf_failed:
3693err_bad_extra_size:
3694	if (secctx)
3695		security_release_secctx(secctx, secctx_sz);
3696err_get_secctx_failed:
3697	kfree(tcomplete);
3698	binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
3699err_alloc_tcomplete_failed:
3700	if (trace_binder_txn_latency_free_enabled())
3701		binder_txn_latency_free(t);
3702	kfree(t);
3703	binder_stats_deleted(BINDER_STAT_TRANSACTION);
3704err_alloc_t_failed:
3705err_bad_todo_list:
3706err_bad_call_stack:
3707err_empty_call_stack:
3708err_dead_binder:
3709err_invalid_target_handle:
 
 
 
 
3710	if (target_node) {
3711		binder_dec_node(target_node, 1, 0);
3712		binder_dec_node_tmpref(target_node);
3713	}
3714
3715	binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
3716		     "%d:%d transaction %s to %d:%d failed %d/%d/%d, size %lld-%lld line %d\n",
3717		     proc->pid, thread->pid, reply ? "reply" :
3718		     (tr->flags & TF_ONE_WAY ? "async" : "call"),
3719		     target_proc ? target_proc->pid : 0,
3720		     target_thread ? target_thread->pid : 0,
3721		     t_debug_id, return_error, return_error_param,
3722		     (u64)tr->data_size, (u64)tr->offsets_size,
3723		     return_error_line);
3724
3725	if (target_thread)
3726		binder_thread_dec_tmpref(target_thread);
3727	if (target_proc)
3728		binder_proc_dec_tmpref(target_proc);
3729
3730	{
3731		struct binder_transaction_log_entry *fe;
3732
3733		e->return_error = return_error;
3734		e->return_error_param = return_error_param;
3735		e->return_error_line = return_error_line;
3736		fe = binder_transaction_log_add(&binder_transaction_log_failed);
3737		*fe = *e;
3738		/*
3739		 * write barrier to synchronize with initialization
3740		 * of log entry
3741		 */
3742		smp_wmb();
3743		WRITE_ONCE(e->debug_id_done, t_debug_id);
3744		WRITE_ONCE(fe->debug_id_done, t_debug_id);
3745	}
3746
3747	BUG_ON(thread->return_error.cmd != BR_OK);
3748	if (in_reply_to) {
3749		binder_set_txn_from_error(in_reply_to, t_debug_id,
3750				return_error, return_error_param);
3751		thread->return_error.cmd = BR_TRANSACTION_COMPLETE;
3752		binder_enqueue_thread_work(thread, &thread->return_error.work);
3753		binder_send_failed_reply(in_reply_to, return_error);
3754	} else {
3755		binder_inner_proc_lock(proc);
3756		binder_set_extended_error(&thread->ee, t_debug_id,
3757				return_error, return_error_param);
3758		binder_inner_proc_unlock(proc);
3759		thread->return_error.cmd = return_error;
3760		binder_enqueue_thread_work(thread, &thread->return_error.work);
3761	}
3762}
3763
3764/**
3765 * binder_free_buf() - free the specified buffer
3766 * @proc:	binder proc that owns buffer
3767 * @buffer:	buffer to be freed
3768 * @is_failure:	failed to send transaction
3769 *
3770 * If buffer for an async transaction, enqueue the next async
3771 * transaction from the node.
3772 *
3773 * Cleanup buffer and free it.
3774 */
3775static void
3776binder_free_buf(struct binder_proc *proc,
3777		struct binder_thread *thread,
3778		struct binder_buffer *buffer, bool is_failure)
3779{
3780	binder_inner_proc_lock(proc);
3781	if (buffer->transaction) {
3782		buffer->transaction->buffer = NULL;
3783		buffer->transaction = NULL;
3784	}
3785	binder_inner_proc_unlock(proc);
3786	if (buffer->async_transaction && buffer->target_node) {
3787		struct binder_node *buf_node;
3788		struct binder_work *w;
3789
3790		buf_node = buffer->target_node;
3791		binder_node_inner_lock(buf_node);
3792		BUG_ON(!buf_node->has_async_transaction);
3793		BUG_ON(buf_node->proc != proc);
3794		w = binder_dequeue_work_head_ilocked(
3795				&buf_node->async_todo);
3796		if (!w) {
3797			buf_node->has_async_transaction = false;
3798		} else {
3799			binder_enqueue_work_ilocked(
3800					w, &proc->todo);
3801			binder_wakeup_proc_ilocked(proc);
3802		}
3803		binder_node_inner_unlock(buf_node);
3804	}
3805	trace_binder_transaction_buffer_release(buffer);
3806	binder_release_entire_buffer(proc, thread, buffer, is_failure);
3807	binder_alloc_free_buf(&proc->alloc, buffer);
3808}
3809
3810static int binder_thread_write(struct binder_proc *proc,
3811			struct binder_thread *thread,
3812			binder_uintptr_t binder_buffer, size_t size,
3813			binder_size_t *consumed)
3814{
3815	uint32_t cmd;
3816	struct binder_context *context = proc->context;
3817	void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
3818	void __user *ptr = buffer + *consumed;
3819	void __user *end = buffer + size;
3820
3821	while (ptr < end && thread->return_error.cmd == BR_OK) {
3822		int ret;
3823
3824		if (get_user(cmd, (uint32_t __user *)ptr))
3825			return -EFAULT;
3826		ptr += sizeof(uint32_t);
3827		trace_binder_command(cmd);
3828		if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
3829			atomic_inc(&binder_stats.bc[_IOC_NR(cmd)]);
3830			atomic_inc(&proc->stats.bc[_IOC_NR(cmd)]);
3831			atomic_inc(&thread->stats.bc[_IOC_NR(cmd)]);
3832		}
3833		switch (cmd) {
3834		case BC_INCREFS:
3835		case BC_ACQUIRE:
3836		case BC_RELEASE:
3837		case BC_DECREFS: {
3838			uint32_t target;
3839			const char *debug_string;
3840			bool strong = cmd == BC_ACQUIRE || cmd == BC_RELEASE;
3841			bool increment = cmd == BC_INCREFS || cmd == BC_ACQUIRE;
3842			struct binder_ref_data rdata;
3843
3844			if (get_user(target, (uint32_t __user *)ptr))
3845				return -EFAULT;
3846
3847			ptr += sizeof(uint32_t);
3848			ret = -1;
3849			if (increment && !target) {
3850				struct binder_node *ctx_mgr_node;
3851
3852				mutex_lock(&context->context_mgr_node_lock);
3853				ctx_mgr_node = context->binder_context_mgr_node;
3854				if (ctx_mgr_node) {
3855					if (ctx_mgr_node->proc == proc) {
3856						binder_user_error("%d:%d context manager tried to acquire desc 0\n",
3857								  proc->pid, thread->pid);
3858						mutex_unlock(&context->context_mgr_node_lock);
3859						return -EINVAL;
3860					}
3861					ret = binder_inc_ref_for_node(
3862							proc, ctx_mgr_node,
3863							strong, NULL, &rdata);
3864				}
3865				mutex_unlock(&context->context_mgr_node_lock);
3866			}
3867			if (ret)
3868				ret = binder_update_ref_for_handle(
3869						proc, target, increment, strong,
3870						&rdata);
3871			if (!ret && rdata.desc != target) {
3872				binder_user_error("%d:%d tried to acquire reference to desc %d, got %d instead\n",
3873					proc->pid, thread->pid,
3874					target, rdata.desc);
3875			}
3876			switch (cmd) {
3877			case BC_INCREFS:
3878				debug_string = "IncRefs";
3879				break;
3880			case BC_ACQUIRE:
3881				debug_string = "Acquire";
3882				break;
3883			case BC_RELEASE:
3884				debug_string = "Release";
3885				break;
3886			case BC_DECREFS:
3887			default:
3888				debug_string = "DecRefs";
3889				break;
3890			}
3891			if (ret) {
3892				binder_user_error("%d:%d %s %d refcount change on invalid ref %d ret %d\n",
3893					proc->pid, thread->pid, debug_string,
3894					strong, target, ret);
3895				break;
3896			}
3897			binder_debug(BINDER_DEBUG_USER_REFS,
3898				     "%d:%d %s ref %d desc %d s %d w %d\n",
3899				     proc->pid, thread->pid, debug_string,
3900				     rdata.debug_id, rdata.desc, rdata.strong,
3901				     rdata.weak);
3902			break;
3903		}
3904		case BC_INCREFS_DONE:
3905		case BC_ACQUIRE_DONE: {
3906			binder_uintptr_t node_ptr;
3907			binder_uintptr_t cookie;
3908			struct binder_node *node;
3909			bool free_node;
3910
3911			if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
3912				return -EFAULT;
3913			ptr += sizeof(binder_uintptr_t);
3914			if (get_user(cookie, (binder_uintptr_t __user *)ptr))
3915				return -EFAULT;
3916			ptr += sizeof(binder_uintptr_t);
3917			node = binder_get_node(proc, node_ptr);
3918			if (node == NULL) {
3919				binder_user_error("%d:%d %s u%016llx no match\n",
3920					proc->pid, thread->pid,
3921					cmd == BC_INCREFS_DONE ?
3922					"BC_INCREFS_DONE" :
3923					"BC_ACQUIRE_DONE",
3924					(u64)node_ptr);
3925				break;
3926			}
3927			if (cookie != node->cookie) {
3928				binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
3929					proc->pid, thread->pid,
3930					cmd == BC_INCREFS_DONE ?
3931					"BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
3932					(u64)node_ptr, node->debug_id,
3933					(u64)cookie, (u64)node->cookie);
3934				binder_put_node(node);
3935				break;
3936			}
3937			binder_node_inner_lock(node);
3938			if (cmd == BC_ACQUIRE_DONE) {
3939				if (node->pending_strong_ref == 0) {
3940					binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
3941						proc->pid, thread->pid,
3942						node->debug_id);
3943					binder_node_inner_unlock(node);
3944					binder_put_node(node);
3945					break;
3946				}
3947				node->pending_strong_ref = 0;
3948			} else {
3949				if (node->pending_weak_ref == 0) {
3950					binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
3951						proc->pid, thread->pid,
3952						node->debug_id);
3953					binder_node_inner_unlock(node);
3954					binder_put_node(node);
3955					break;
3956				}
3957				node->pending_weak_ref = 0;
3958			}
3959			free_node = binder_dec_node_nilocked(node,
3960					cmd == BC_ACQUIRE_DONE, 0);
3961			WARN_ON(free_node);
3962			binder_debug(BINDER_DEBUG_USER_REFS,
3963				     "%d:%d %s node %d ls %d lw %d tr %d\n",
3964				     proc->pid, thread->pid,
3965				     cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
3966				     node->debug_id, node->local_strong_refs,
3967				     node->local_weak_refs, node->tmp_refs);
3968			binder_node_inner_unlock(node);
3969			binder_put_node(node);
3970			break;
3971		}
3972		case BC_ATTEMPT_ACQUIRE:
3973			pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
3974			return -EINVAL;
3975		case BC_ACQUIRE_RESULT:
3976			pr_err("BC_ACQUIRE_RESULT not supported\n");
3977			return -EINVAL;
3978
3979		case BC_FREE_BUFFER: {
3980			binder_uintptr_t data_ptr;
3981			struct binder_buffer *buffer;
3982
3983			if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
3984				return -EFAULT;
3985			ptr += sizeof(binder_uintptr_t);
3986
3987			buffer = binder_alloc_prepare_to_free(&proc->alloc,
3988							      data_ptr);
3989			if (IS_ERR_OR_NULL(buffer)) {
3990				if (PTR_ERR(buffer) == -EPERM) {
3991					binder_user_error(
3992						"%d:%d BC_FREE_BUFFER u%016llx matched unreturned or currently freeing buffer\n",
3993						proc->pid, thread->pid,
3994						(u64)data_ptr);
3995				} else {
3996					binder_user_error(
3997						"%d:%d BC_FREE_BUFFER u%016llx no match\n",
3998						proc->pid, thread->pid,
3999						(u64)data_ptr);
4000				}
4001				break;
4002			}
4003			binder_debug(BINDER_DEBUG_FREE_BUFFER,
4004				     "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
4005				     proc->pid, thread->pid, (u64)data_ptr,
4006				     buffer->debug_id,
4007				     buffer->transaction ? "active" : "finished");
4008			binder_free_buf(proc, thread, buffer, false);
4009			break;
4010		}
4011
4012		case BC_TRANSACTION_SG:
4013		case BC_REPLY_SG: {
4014			struct binder_transaction_data_sg tr;
4015
4016			if (copy_from_user(&tr, ptr, sizeof(tr)))
4017				return -EFAULT;
4018			ptr += sizeof(tr);
4019			binder_transaction(proc, thread, &tr.transaction_data,
4020					   cmd == BC_REPLY_SG, tr.buffers_size);
4021			break;
4022		}
4023		case BC_TRANSACTION:
4024		case BC_REPLY: {
4025			struct binder_transaction_data tr;
4026
4027			if (copy_from_user(&tr, ptr, sizeof(tr)))
4028				return -EFAULT;
4029			ptr += sizeof(tr);
4030			binder_transaction(proc, thread, &tr,
4031					   cmd == BC_REPLY, 0);
4032			break;
4033		}
4034
4035		case BC_REGISTER_LOOPER:
4036			binder_debug(BINDER_DEBUG_THREADS,
4037				     "%d:%d BC_REGISTER_LOOPER\n",
4038				     proc->pid, thread->pid);
4039			binder_inner_proc_lock(proc);
4040			if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
4041				thread->looper |= BINDER_LOOPER_STATE_INVALID;
4042				binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
4043					proc->pid, thread->pid);
4044			} else if (proc->requested_threads == 0) {
4045				thread->looper |= BINDER_LOOPER_STATE_INVALID;
4046				binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
4047					proc->pid, thread->pid);
4048			} else {
4049				proc->requested_threads--;
4050				proc->requested_threads_started++;
4051			}
4052			thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
4053			binder_inner_proc_unlock(proc);
4054			break;
4055		case BC_ENTER_LOOPER:
4056			binder_debug(BINDER_DEBUG_THREADS,
4057				     "%d:%d BC_ENTER_LOOPER\n",
4058				     proc->pid, thread->pid);
4059			if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
4060				thread->looper |= BINDER_LOOPER_STATE_INVALID;
4061				binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
4062					proc->pid, thread->pid);
4063			}
4064			thread->looper |= BINDER_LOOPER_STATE_ENTERED;
4065			break;
4066		case BC_EXIT_LOOPER:
4067			binder_debug(BINDER_DEBUG_THREADS,
4068				     "%d:%d BC_EXIT_LOOPER\n",
4069				     proc->pid, thread->pid);
4070			thread->looper |= BINDER_LOOPER_STATE_EXITED;
4071			break;
4072
4073		case BC_REQUEST_DEATH_NOTIFICATION:
4074		case BC_CLEAR_DEATH_NOTIFICATION: {
4075			uint32_t target;
4076			binder_uintptr_t cookie;
4077			struct binder_ref *ref;
4078			struct binder_ref_death *death = NULL;
4079
4080			if (get_user(target, (uint32_t __user *)ptr))
4081				return -EFAULT;
4082			ptr += sizeof(uint32_t);
4083			if (get_user(cookie, (binder_uintptr_t __user *)ptr))
4084				return -EFAULT;
4085			ptr += sizeof(binder_uintptr_t);
4086			if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
4087				/*
4088				 * Allocate memory for death notification
4089				 * before taking lock
4090				 */
4091				death = kzalloc(sizeof(*death), GFP_KERNEL);
4092				if (death == NULL) {
4093					WARN_ON(thread->return_error.cmd !=
4094						BR_OK);
4095					thread->return_error.cmd = BR_ERROR;
4096					binder_enqueue_thread_work(
4097						thread,
4098						&thread->return_error.work);
4099					binder_debug(
4100						BINDER_DEBUG_FAILED_TRANSACTION,
4101						"%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
4102						proc->pid, thread->pid);
4103					break;
4104				}
4105			}
4106			binder_proc_lock(proc);
4107			ref = binder_get_ref_olocked(proc, target, false);
4108			if (ref == NULL) {
4109				binder_user_error("%d:%d %s invalid ref %d\n",
4110					proc->pid, thread->pid,
4111					cmd == BC_REQUEST_DEATH_NOTIFICATION ?
4112					"BC_REQUEST_DEATH_NOTIFICATION" :
4113					"BC_CLEAR_DEATH_NOTIFICATION",
4114					target);
4115				binder_proc_unlock(proc);
4116				kfree(death);
4117				break;
4118			}
4119
4120			binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
4121				     "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
4122				     proc->pid, thread->pid,
4123				     cmd == BC_REQUEST_DEATH_NOTIFICATION ?
4124				     "BC_REQUEST_DEATH_NOTIFICATION" :
4125				     "BC_CLEAR_DEATH_NOTIFICATION",
4126				     (u64)cookie, ref->data.debug_id,
4127				     ref->data.desc, ref->data.strong,
4128				     ref->data.weak, ref->node->debug_id);
4129
4130			binder_node_lock(ref->node);
4131			if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
4132				if (ref->death) {
4133					binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
4134						proc->pid, thread->pid);
4135					binder_node_unlock(ref->node);
4136					binder_proc_unlock(proc);
4137					kfree(death);
4138					break;
4139				}
4140				binder_stats_created(BINDER_STAT_DEATH);
4141				INIT_LIST_HEAD(&death->work.entry);
4142				death->cookie = cookie;
4143				ref->death = death;
4144				if (ref->node->proc == NULL) {
4145					ref->death->work.type = BINDER_WORK_DEAD_BINDER;
4146
4147					binder_inner_proc_lock(proc);
4148					binder_enqueue_work_ilocked(
4149						&ref->death->work, &proc->todo);
4150					binder_wakeup_proc_ilocked(proc);
4151					binder_inner_proc_unlock(proc);
4152				}
4153			} else {
4154				if (ref->death == NULL) {
4155					binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
4156						proc->pid, thread->pid);
4157					binder_node_unlock(ref->node);
4158					binder_proc_unlock(proc);
4159					break;
4160				}
4161				death = ref->death;
4162				if (death->cookie != cookie) {
4163					binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
4164						proc->pid, thread->pid,
4165						(u64)death->cookie,
4166						(u64)cookie);
4167					binder_node_unlock(ref->node);
4168					binder_proc_unlock(proc);
4169					break;
4170				}
4171				ref->death = NULL;
4172				binder_inner_proc_lock(proc);
4173				if (list_empty(&death->work.entry)) {
4174					death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
4175					if (thread->looper &
4176					    (BINDER_LOOPER_STATE_REGISTERED |
4177					     BINDER_LOOPER_STATE_ENTERED))
4178						binder_enqueue_thread_work_ilocked(
4179								thread,
4180								&death->work);
4181					else {
4182						binder_enqueue_work_ilocked(
4183								&death->work,
4184								&proc->todo);
4185						binder_wakeup_proc_ilocked(
4186								proc);
4187					}
4188				} else {
4189					BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
4190					death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
4191				}
4192				binder_inner_proc_unlock(proc);
4193			}
4194			binder_node_unlock(ref->node);
4195			binder_proc_unlock(proc);
4196		} break;
4197		case BC_DEAD_BINDER_DONE: {
4198			struct binder_work *w;
4199			binder_uintptr_t cookie;
4200			struct binder_ref_death *death = NULL;
4201
4202			if (get_user(cookie, (binder_uintptr_t __user *)ptr))
4203				return -EFAULT;
4204
4205			ptr += sizeof(cookie);
4206			binder_inner_proc_lock(proc);
4207			list_for_each_entry(w, &proc->delivered_death,
4208					    entry) {
4209				struct binder_ref_death *tmp_death =
4210					container_of(w,
4211						     struct binder_ref_death,
4212						     work);
4213
4214				if (tmp_death->cookie == cookie) {
4215					death = tmp_death;
4216					break;
4217				}
4218			}
4219			binder_debug(BINDER_DEBUG_DEAD_BINDER,
4220				     "%d:%d BC_DEAD_BINDER_DONE %016llx found %pK\n",
4221				     proc->pid, thread->pid, (u64)cookie,
4222				     death);
4223			if (death == NULL) {
4224				binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
4225					proc->pid, thread->pid, (u64)cookie);
4226				binder_inner_proc_unlock(proc);
4227				break;
4228			}
4229			binder_dequeue_work_ilocked(&death->work);
4230			if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
4231				death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
4232				if (thread->looper &
4233					(BINDER_LOOPER_STATE_REGISTERED |
4234					 BINDER_LOOPER_STATE_ENTERED))
4235					binder_enqueue_thread_work_ilocked(
4236						thread, &death->work);
4237				else {
4238					binder_enqueue_work_ilocked(
4239							&death->work,
4240							&proc->todo);
4241					binder_wakeup_proc_ilocked(proc);
4242				}
4243			}
4244			binder_inner_proc_unlock(proc);
4245		} break;
4246
4247		default:
4248			pr_err("%d:%d unknown command %u\n",
4249			       proc->pid, thread->pid, cmd);
4250			return -EINVAL;
4251		}
4252		*consumed = ptr - buffer;
4253	}
4254	return 0;
4255}
4256
4257static void binder_stat_br(struct binder_proc *proc,
4258			   struct binder_thread *thread, uint32_t cmd)
4259{
4260	trace_binder_return(cmd);
4261	if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
4262		atomic_inc(&binder_stats.br[_IOC_NR(cmd)]);
4263		atomic_inc(&proc->stats.br[_IOC_NR(cmd)]);
4264		atomic_inc(&thread->stats.br[_IOC_NR(cmd)]);
4265	}
4266}
4267
4268static int binder_put_node_cmd(struct binder_proc *proc,
4269			       struct binder_thread *thread,
4270			       void __user **ptrp,
4271			       binder_uintptr_t node_ptr,
4272			       binder_uintptr_t node_cookie,
4273			       int node_debug_id,
4274			       uint32_t cmd, const char *cmd_name)
4275{
4276	void __user *ptr = *ptrp;
4277
4278	if (put_user(cmd, (uint32_t __user *)ptr))
4279		return -EFAULT;
4280	ptr += sizeof(uint32_t);
4281
4282	if (put_user(node_ptr, (binder_uintptr_t __user *)ptr))
4283		return -EFAULT;
4284	ptr += sizeof(binder_uintptr_t);
4285
4286	if (put_user(node_cookie, (binder_uintptr_t __user *)ptr))
4287		return -EFAULT;
4288	ptr += sizeof(binder_uintptr_t);
4289
4290	binder_stat_br(proc, thread, cmd);
4291	binder_debug(BINDER_DEBUG_USER_REFS, "%d:%d %s %d u%016llx c%016llx\n",
4292		     proc->pid, thread->pid, cmd_name, node_debug_id,
4293		     (u64)node_ptr, (u64)node_cookie);
4294
4295	*ptrp = ptr;
4296	return 0;
4297}
4298
4299static int binder_wait_for_work(struct binder_thread *thread,
4300				bool do_proc_work)
4301{
4302	DEFINE_WAIT(wait);
4303	struct binder_proc *proc = thread->proc;
4304	int ret = 0;
4305
 
4306	binder_inner_proc_lock(proc);
4307	for (;;) {
4308		prepare_to_wait(&thread->wait, &wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE);
4309		if (binder_has_work_ilocked(thread, do_proc_work))
4310			break;
4311		if (do_proc_work)
4312			list_add(&thread->waiting_thread_node,
4313				 &proc->waiting_threads);
4314		binder_inner_proc_unlock(proc);
4315		schedule();
4316		binder_inner_proc_lock(proc);
4317		list_del_init(&thread->waiting_thread_node);
4318		if (signal_pending(current)) {
4319			ret = -EINTR;
4320			break;
4321		}
4322	}
4323	finish_wait(&thread->wait, &wait);
4324	binder_inner_proc_unlock(proc);
 
4325
4326	return ret;
4327}
4328
4329/**
4330 * binder_apply_fd_fixups() - finish fd translation
4331 * @proc:         binder_proc associated @t->buffer
4332 * @t:	binder transaction with list of fd fixups
4333 *
4334 * Now that we are in the context of the transaction target
4335 * process, we can allocate and install fds. Process the
4336 * list of fds to translate and fixup the buffer with the
4337 * new fds first and only then install the files.
4338 *
4339 * If we fail to allocate an fd, skip the install and release
 
4340 * any fds that have already been allocated.
4341 */
4342static int binder_apply_fd_fixups(struct binder_proc *proc,
4343				  struct binder_transaction *t)
4344{
4345	struct binder_txn_fd_fixup *fixup, *tmp;
4346	int ret = 0;
4347
4348	list_for_each_entry(fixup, &t->fd_fixups, fixup_entry) {
4349		int fd = get_unused_fd_flags(O_CLOEXEC);
4350
4351		if (fd < 0) {
4352			binder_debug(BINDER_DEBUG_TRANSACTION,
4353				     "failed fd fixup txn %d fd %d\n",
4354				     t->debug_id, fd);
4355			ret = -ENOMEM;
4356			goto err;
4357		}
4358		binder_debug(BINDER_DEBUG_TRANSACTION,
4359			     "fd fixup txn %d fd %d\n",
4360			     t->debug_id, fd);
4361		trace_binder_transaction_fd_recv(t, fd, fixup->offset);
4362		fixup->target_fd = fd;
 
4363		if (binder_alloc_copy_to_buffer(&proc->alloc, t->buffer,
4364						fixup->offset, &fd,
4365						sizeof(u32))) {
4366			ret = -EINVAL;
4367			goto err;
4368		}
4369	}
4370	list_for_each_entry_safe(fixup, tmp, &t->fd_fixups, fixup_entry) {
4371		fd_install(fixup->target_fd, fixup->file);
 
 
 
 
 
 
 
 
 
 
 
 
 
4372		list_del(&fixup->fixup_entry);
4373		kfree(fixup);
4374	}
4375
4376	return ret;
4377
4378err:
4379	binder_free_txn_fixups(t);
4380	return ret;
4381}
4382
4383static int binder_thread_read(struct binder_proc *proc,
4384			      struct binder_thread *thread,
4385			      binder_uintptr_t binder_buffer, size_t size,
4386			      binder_size_t *consumed, int non_block)
4387{
4388	void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
4389	void __user *ptr = buffer + *consumed;
4390	void __user *end = buffer + size;
4391
4392	int ret = 0;
4393	int wait_for_proc_work;
4394
4395	if (*consumed == 0) {
4396		if (put_user(BR_NOOP, (uint32_t __user *)ptr))
4397			return -EFAULT;
4398		ptr += sizeof(uint32_t);
4399	}
4400
4401retry:
4402	binder_inner_proc_lock(proc);
4403	wait_for_proc_work = binder_available_for_proc_work_ilocked(thread);
4404	binder_inner_proc_unlock(proc);
4405
4406	thread->looper |= BINDER_LOOPER_STATE_WAITING;
4407
4408	trace_binder_wait_for_work(wait_for_proc_work,
4409				   !!thread->transaction_stack,
4410				   !binder_worklist_empty(proc, &thread->todo));
4411	if (wait_for_proc_work) {
4412		if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
4413					BINDER_LOOPER_STATE_ENTERED))) {
4414			binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
4415				proc->pid, thread->pid, thread->looper);
4416			wait_event_interruptible(binder_user_error_wait,
4417						 binder_stop_on_user_error < 2);
4418		}
4419		binder_set_nice(proc->default_priority);
4420	}
4421
4422	if (non_block) {
4423		if (!binder_has_work(thread, wait_for_proc_work))
4424			ret = -EAGAIN;
4425	} else {
4426		ret = binder_wait_for_work(thread, wait_for_proc_work);
4427	}
4428
4429	thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
4430
4431	if (ret)
4432		return ret;
4433
4434	while (1) {
4435		uint32_t cmd;
4436		struct binder_transaction_data_secctx tr;
4437		struct binder_transaction_data *trd = &tr.transaction_data;
4438		struct binder_work *w = NULL;
4439		struct list_head *list = NULL;
4440		struct binder_transaction *t = NULL;
4441		struct binder_thread *t_from;
4442		size_t trsize = sizeof(*trd);
4443
4444		binder_inner_proc_lock(proc);
4445		if (!binder_worklist_empty_ilocked(&thread->todo))
4446			list = &thread->todo;
4447		else if (!binder_worklist_empty_ilocked(&proc->todo) &&
4448			   wait_for_proc_work)
4449			list = &proc->todo;
4450		else {
4451			binder_inner_proc_unlock(proc);
4452
4453			/* no data added */
4454			if (ptr - buffer == 4 && !thread->looper_need_return)
4455				goto retry;
4456			break;
4457		}
4458
4459		if (end - ptr < sizeof(tr) + 4) {
4460			binder_inner_proc_unlock(proc);
4461			break;
4462		}
4463		w = binder_dequeue_work_head_ilocked(list);
4464		if (binder_worklist_empty_ilocked(&thread->todo))
4465			thread->process_todo = false;
4466
4467		switch (w->type) {
4468		case BINDER_WORK_TRANSACTION: {
4469			binder_inner_proc_unlock(proc);
4470			t = container_of(w, struct binder_transaction, work);
4471		} break;
4472		case BINDER_WORK_RETURN_ERROR: {
4473			struct binder_error *e = container_of(
4474					w, struct binder_error, work);
4475
4476			WARN_ON(e->cmd == BR_OK);
4477			binder_inner_proc_unlock(proc);
4478			if (put_user(e->cmd, (uint32_t __user *)ptr))
4479				return -EFAULT;
4480			cmd = e->cmd;
4481			e->cmd = BR_OK;
4482			ptr += sizeof(uint32_t);
4483
4484			binder_stat_br(proc, thread, cmd);
4485		} break;
4486		case BINDER_WORK_TRANSACTION_COMPLETE:
4487		case BINDER_WORK_TRANSACTION_PENDING:
4488		case BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT: {
4489			if (proc->oneway_spam_detection_enabled &&
4490				   w->type == BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT)
4491				cmd = BR_ONEWAY_SPAM_SUSPECT;
4492			else if (w->type == BINDER_WORK_TRANSACTION_PENDING)
4493				cmd = BR_TRANSACTION_PENDING_FROZEN;
4494			else
4495				cmd = BR_TRANSACTION_COMPLETE;
4496			binder_inner_proc_unlock(proc);
 
4497			kfree(w);
4498			binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
4499			if (put_user(cmd, (uint32_t __user *)ptr))
4500				return -EFAULT;
4501			ptr += sizeof(uint32_t);
4502
4503			binder_stat_br(proc, thread, cmd);
4504			binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
4505				     "%d:%d BR_TRANSACTION_COMPLETE\n",
4506				     proc->pid, thread->pid);
4507		} break;
4508		case BINDER_WORK_NODE: {
4509			struct binder_node *node = container_of(w, struct binder_node, work);
4510			int strong, weak;
4511			binder_uintptr_t node_ptr = node->ptr;
4512			binder_uintptr_t node_cookie = node->cookie;
4513			int node_debug_id = node->debug_id;
4514			int has_weak_ref;
4515			int has_strong_ref;
4516			void __user *orig_ptr = ptr;
4517
4518			BUG_ON(proc != node->proc);
4519			strong = node->internal_strong_refs ||
4520					node->local_strong_refs;
4521			weak = !hlist_empty(&node->refs) ||
4522					node->local_weak_refs ||
4523					node->tmp_refs || strong;
4524			has_strong_ref = node->has_strong_ref;
4525			has_weak_ref = node->has_weak_ref;
4526
4527			if (weak && !has_weak_ref) {
4528				node->has_weak_ref = 1;
4529				node->pending_weak_ref = 1;
4530				node->local_weak_refs++;
4531			}
4532			if (strong && !has_strong_ref) {
4533				node->has_strong_ref = 1;
4534				node->pending_strong_ref = 1;
4535				node->local_strong_refs++;
4536			}
4537			if (!strong && has_strong_ref)
4538				node->has_strong_ref = 0;
4539			if (!weak && has_weak_ref)
4540				node->has_weak_ref = 0;
4541			if (!weak && !strong) {
4542				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
4543					     "%d:%d node %d u%016llx c%016llx deleted\n",
4544					     proc->pid, thread->pid,
4545					     node_debug_id,
4546					     (u64)node_ptr,
4547					     (u64)node_cookie);
4548				rb_erase(&node->rb_node, &proc->nodes);
4549				binder_inner_proc_unlock(proc);
4550				binder_node_lock(node);
4551				/*
4552				 * Acquire the node lock before freeing the
4553				 * node to serialize with other threads that
4554				 * may have been holding the node lock while
4555				 * decrementing this node (avoids race where
4556				 * this thread frees while the other thread
4557				 * is unlocking the node after the final
4558				 * decrement)
4559				 */
4560				binder_node_unlock(node);
4561				binder_free_node(node);
4562			} else
4563				binder_inner_proc_unlock(proc);
4564
4565			if (weak && !has_weak_ref)
4566				ret = binder_put_node_cmd(
4567						proc, thread, &ptr, node_ptr,
4568						node_cookie, node_debug_id,
4569						BR_INCREFS, "BR_INCREFS");
4570			if (!ret && strong && !has_strong_ref)
4571				ret = binder_put_node_cmd(
4572						proc, thread, &ptr, node_ptr,
4573						node_cookie, node_debug_id,
4574						BR_ACQUIRE, "BR_ACQUIRE");
4575			if (!ret && !strong && has_strong_ref)
4576				ret = binder_put_node_cmd(
4577						proc, thread, &ptr, node_ptr,
4578						node_cookie, node_debug_id,
4579						BR_RELEASE, "BR_RELEASE");
4580			if (!ret && !weak && has_weak_ref)
4581				ret = binder_put_node_cmd(
4582						proc, thread, &ptr, node_ptr,
4583						node_cookie, node_debug_id,
4584						BR_DECREFS, "BR_DECREFS");
4585			if (orig_ptr == ptr)
4586				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
4587					     "%d:%d node %d u%016llx c%016llx state unchanged\n",
4588					     proc->pid, thread->pid,
4589					     node_debug_id,
4590					     (u64)node_ptr,
4591					     (u64)node_cookie);
4592			if (ret)
4593				return ret;
4594		} break;
4595		case BINDER_WORK_DEAD_BINDER:
4596		case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
4597		case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
4598			struct binder_ref_death *death;
4599			uint32_t cmd;
4600			binder_uintptr_t cookie;
4601
4602			death = container_of(w, struct binder_ref_death, work);
4603			if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
4604				cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
4605			else
4606				cmd = BR_DEAD_BINDER;
4607			cookie = death->cookie;
4608
4609			binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
4610				     "%d:%d %s %016llx\n",
4611				      proc->pid, thread->pid,
4612				      cmd == BR_DEAD_BINDER ?
4613				      "BR_DEAD_BINDER" :
4614				      "BR_CLEAR_DEATH_NOTIFICATION_DONE",
4615				      (u64)cookie);
4616			if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
4617				binder_inner_proc_unlock(proc);
4618				kfree(death);
4619				binder_stats_deleted(BINDER_STAT_DEATH);
4620			} else {
4621				binder_enqueue_work_ilocked(
4622						w, &proc->delivered_death);
4623				binder_inner_proc_unlock(proc);
4624			}
4625			if (put_user(cmd, (uint32_t __user *)ptr))
4626				return -EFAULT;
4627			ptr += sizeof(uint32_t);
4628			if (put_user(cookie,
4629				     (binder_uintptr_t __user *)ptr))
4630				return -EFAULT;
4631			ptr += sizeof(binder_uintptr_t);
4632			binder_stat_br(proc, thread, cmd);
4633			if (cmd == BR_DEAD_BINDER)
4634				goto done; /* DEAD_BINDER notifications can cause transactions */
4635		} break;
4636		default:
4637			binder_inner_proc_unlock(proc);
4638			pr_err("%d:%d: bad work type %d\n",
4639			       proc->pid, thread->pid, w->type);
4640			break;
4641		}
4642
4643		if (!t)
4644			continue;
4645
4646		BUG_ON(t->buffer == NULL);
4647		if (t->buffer->target_node) {
4648			struct binder_node *target_node = t->buffer->target_node;
4649
4650			trd->target.ptr = target_node->ptr;
4651			trd->cookie =  target_node->cookie;
4652			t->saved_priority = task_nice(current);
4653			if (t->priority < target_node->min_priority &&
4654			    !(t->flags & TF_ONE_WAY))
4655				binder_set_nice(t->priority);
4656			else if (!(t->flags & TF_ONE_WAY) ||
4657				 t->saved_priority > target_node->min_priority)
4658				binder_set_nice(target_node->min_priority);
4659			cmd = BR_TRANSACTION;
4660		} else {
4661			trd->target.ptr = 0;
4662			trd->cookie = 0;
4663			cmd = BR_REPLY;
4664		}
4665		trd->code = t->code;
4666		trd->flags = t->flags;
4667		trd->sender_euid = from_kuid(current_user_ns(), t->sender_euid);
4668
4669		t_from = binder_get_txn_from(t);
4670		if (t_from) {
4671			struct task_struct *sender = t_from->proc->tsk;
4672
4673			trd->sender_pid =
4674				task_tgid_nr_ns(sender,
4675						task_active_pid_ns(current));
4676		} else {
4677			trd->sender_pid = 0;
4678		}
4679
4680		ret = binder_apply_fd_fixups(proc, t);
4681		if (ret) {
4682			struct binder_buffer *buffer = t->buffer;
4683			bool oneway = !!(t->flags & TF_ONE_WAY);
4684			int tid = t->debug_id;
4685
4686			if (t_from)
4687				binder_thread_dec_tmpref(t_from);
4688			buffer->transaction = NULL;
4689			binder_cleanup_transaction(t, "fd fixups failed",
4690						   BR_FAILED_REPLY);
4691			binder_free_buf(proc, thread, buffer, true);
4692			binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
4693				     "%d:%d %stransaction %d fd fixups failed %d/%d, line %d\n",
4694				     proc->pid, thread->pid,
4695				     oneway ? "async " :
4696					(cmd == BR_REPLY ? "reply " : ""),
4697				     tid, BR_FAILED_REPLY, ret, __LINE__);
4698			if (cmd == BR_REPLY) {
4699				cmd = BR_FAILED_REPLY;
4700				if (put_user(cmd, (uint32_t __user *)ptr))
4701					return -EFAULT;
4702				ptr += sizeof(uint32_t);
4703				binder_stat_br(proc, thread, cmd);
4704				break;
4705			}
4706			continue;
4707		}
4708		trd->data_size = t->buffer->data_size;
4709		trd->offsets_size = t->buffer->offsets_size;
4710		trd->data.ptr.buffer = t->buffer->user_data;
4711		trd->data.ptr.offsets = trd->data.ptr.buffer +
4712					ALIGN(t->buffer->data_size,
4713					    sizeof(void *));
4714
4715		tr.secctx = t->security_ctx;
4716		if (t->security_ctx) {
4717			cmd = BR_TRANSACTION_SEC_CTX;
4718			trsize = sizeof(tr);
4719		}
4720		if (put_user(cmd, (uint32_t __user *)ptr)) {
4721			if (t_from)
4722				binder_thread_dec_tmpref(t_from);
4723
4724			binder_cleanup_transaction(t, "put_user failed",
4725						   BR_FAILED_REPLY);
4726
4727			return -EFAULT;
4728		}
4729		ptr += sizeof(uint32_t);
4730		if (copy_to_user(ptr, &tr, trsize)) {
4731			if (t_from)
4732				binder_thread_dec_tmpref(t_from);
4733
4734			binder_cleanup_transaction(t, "copy_to_user failed",
4735						   BR_FAILED_REPLY);
4736
4737			return -EFAULT;
4738		}
4739		ptr += trsize;
4740
4741		trace_binder_transaction_received(t);
4742		binder_stat_br(proc, thread, cmd);
4743		binder_debug(BINDER_DEBUG_TRANSACTION,
4744			     "%d:%d %s %d %d:%d, cmd %u size %zd-%zd ptr %016llx-%016llx\n",
4745			     proc->pid, thread->pid,
4746			     (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
4747				(cmd == BR_TRANSACTION_SEC_CTX) ?
4748				     "BR_TRANSACTION_SEC_CTX" : "BR_REPLY",
4749			     t->debug_id, t_from ? t_from->proc->pid : 0,
4750			     t_from ? t_from->pid : 0, cmd,
4751			     t->buffer->data_size, t->buffer->offsets_size,
4752			     (u64)trd->data.ptr.buffer,
4753			     (u64)trd->data.ptr.offsets);
4754
4755		if (t_from)
4756			binder_thread_dec_tmpref(t_from);
4757		t->buffer->allow_user_free = 1;
4758		if (cmd != BR_REPLY && !(t->flags & TF_ONE_WAY)) {
4759			binder_inner_proc_lock(thread->proc);
4760			t->to_parent = thread->transaction_stack;
4761			t->to_thread = thread;
4762			thread->transaction_stack = t;
4763			binder_inner_proc_unlock(thread->proc);
4764		} else {
4765			binder_free_transaction(t);
4766		}
4767		break;
4768	}
4769
4770done:
4771
4772	*consumed = ptr - buffer;
4773	binder_inner_proc_lock(proc);
4774	if (proc->requested_threads == 0 &&
4775	    list_empty(&thread->proc->waiting_threads) &&
4776	    proc->requested_threads_started < proc->max_threads &&
4777	    (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
4778	     BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
4779	     /*spawn a new thread if we leave this out */) {
4780		proc->requested_threads++;
4781		binder_inner_proc_unlock(proc);
4782		binder_debug(BINDER_DEBUG_THREADS,
4783			     "%d:%d BR_SPAWN_LOOPER\n",
4784			     proc->pid, thread->pid);
4785		if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
4786			return -EFAULT;
4787		binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
4788	} else
4789		binder_inner_proc_unlock(proc);
4790	return 0;
4791}
4792
4793static void binder_release_work(struct binder_proc *proc,
4794				struct list_head *list)
4795{
4796	struct binder_work *w;
4797	enum binder_work_type wtype;
4798
4799	while (1) {
4800		binder_inner_proc_lock(proc);
4801		w = binder_dequeue_work_head_ilocked(list);
4802		wtype = w ? w->type : 0;
4803		binder_inner_proc_unlock(proc);
4804		if (!w)
4805			return;
4806
4807		switch (wtype) {
4808		case BINDER_WORK_TRANSACTION: {
4809			struct binder_transaction *t;
4810
4811			t = container_of(w, struct binder_transaction, work);
4812
4813			binder_cleanup_transaction(t, "process died.",
4814						   BR_DEAD_REPLY);
4815		} break;
4816		case BINDER_WORK_RETURN_ERROR: {
4817			struct binder_error *e = container_of(
4818					w, struct binder_error, work);
4819
4820			binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
4821				"undelivered TRANSACTION_ERROR: %u\n",
4822				e->cmd);
4823		} break;
4824		case BINDER_WORK_TRANSACTION_PENDING:
4825		case BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT:
4826		case BINDER_WORK_TRANSACTION_COMPLETE: {
4827			binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
4828				"undelivered TRANSACTION_COMPLETE\n");
4829			kfree(w);
4830			binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
4831		} break;
4832		case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
4833		case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
4834			struct binder_ref_death *death;
4835
4836			death = container_of(w, struct binder_ref_death, work);
4837			binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
4838				"undelivered death notification, %016llx\n",
4839				(u64)death->cookie);
4840			kfree(death);
4841			binder_stats_deleted(BINDER_STAT_DEATH);
4842		} break;
4843		case BINDER_WORK_NODE:
4844			break;
4845		default:
4846			pr_err("unexpected work type, %d, not freed\n",
4847			       wtype);
4848			break;
4849		}
4850	}
4851
4852}
4853
4854static struct binder_thread *binder_get_thread_ilocked(
4855		struct binder_proc *proc, struct binder_thread *new_thread)
4856{
4857	struct binder_thread *thread = NULL;
4858	struct rb_node *parent = NULL;
4859	struct rb_node **p = &proc->threads.rb_node;
4860
4861	while (*p) {
4862		parent = *p;
4863		thread = rb_entry(parent, struct binder_thread, rb_node);
4864
4865		if (current->pid < thread->pid)
4866			p = &(*p)->rb_left;
4867		else if (current->pid > thread->pid)
4868			p = &(*p)->rb_right;
4869		else
4870			return thread;
4871	}
4872	if (!new_thread)
4873		return NULL;
4874	thread = new_thread;
4875	binder_stats_created(BINDER_STAT_THREAD);
4876	thread->proc = proc;
4877	thread->pid = current->pid;
4878	atomic_set(&thread->tmp_ref, 0);
4879	init_waitqueue_head(&thread->wait);
4880	INIT_LIST_HEAD(&thread->todo);
4881	rb_link_node(&thread->rb_node, parent, p);
4882	rb_insert_color(&thread->rb_node, &proc->threads);
4883	thread->looper_need_return = true;
4884	thread->return_error.work.type = BINDER_WORK_RETURN_ERROR;
4885	thread->return_error.cmd = BR_OK;
4886	thread->reply_error.work.type = BINDER_WORK_RETURN_ERROR;
4887	thread->reply_error.cmd = BR_OK;
4888	thread->ee.command = BR_OK;
4889	INIT_LIST_HEAD(&new_thread->waiting_thread_node);
4890	return thread;
4891}
4892
4893static struct binder_thread *binder_get_thread(struct binder_proc *proc)
4894{
4895	struct binder_thread *thread;
4896	struct binder_thread *new_thread;
4897
4898	binder_inner_proc_lock(proc);
4899	thread = binder_get_thread_ilocked(proc, NULL);
4900	binder_inner_proc_unlock(proc);
4901	if (!thread) {
4902		new_thread = kzalloc(sizeof(*thread), GFP_KERNEL);
4903		if (new_thread == NULL)
4904			return NULL;
4905		binder_inner_proc_lock(proc);
4906		thread = binder_get_thread_ilocked(proc, new_thread);
4907		binder_inner_proc_unlock(proc);
4908		if (thread != new_thread)
4909			kfree(new_thread);
4910	}
4911	return thread;
4912}
4913
4914static void binder_free_proc(struct binder_proc *proc)
4915{
4916	struct binder_device *device;
4917
4918	BUG_ON(!list_empty(&proc->todo));
4919	BUG_ON(!list_empty(&proc->delivered_death));
4920	if (proc->outstanding_txns)
4921		pr_warn("%s: Unexpected outstanding_txns %d\n",
4922			__func__, proc->outstanding_txns);
4923	device = container_of(proc->context, struct binder_device, context);
4924	if (refcount_dec_and_test(&device->ref)) {
4925		kfree(proc->context->name);
4926		kfree(device);
4927	}
4928	binder_alloc_deferred_release(&proc->alloc);
4929	put_task_struct(proc->tsk);
4930	put_cred(proc->cred);
4931	binder_stats_deleted(BINDER_STAT_PROC);
4932	kfree(proc);
4933}
4934
4935static void binder_free_thread(struct binder_thread *thread)
4936{
4937	BUG_ON(!list_empty(&thread->todo));
4938	binder_stats_deleted(BINDER_STAT_THREAD);
4939	binder_proc_dec_tmpref(thread->proc);
4940	kfree(thread);
4941}
4942
4943static int binder_thread_release(struct binder_proc *proc,
4944				 struct binder_thread *thread)
4945{
4946	struct binder_transaction *t;
4947	struct binder_transaction *send_reply = NULL;
4948	int active_transactions = 0;
4949	struct binder_transaction *last_t = NULL;
4950
4951	binder_inner_proc_lock(thread->proc);
4952	/*
4953	 * take a ref on the proc so it survives
4954	 * after we remove this thread from proc->threads.
4955	 * The corresponding dec is when we actually
4956	 * free the thread in binder_free_thread()
4957	 */
4958	proc->tmp_ref++;
4959	/*
4960	 * take a ref on this thread to ensure it
4961	 * survives while we are releasing it
4962	 */
4963	atomic_inc(&thread->tmp_ref);
4964	rb_erase(&thread->rb_node, &proc->threads);
4965	t = thread->transaction_stack;
4966	if (t) {
4967		spin_lock(&t->lock);
4968		if (t->to_thread == thread)
4969			send_reply = t;
4970	} else {
4971		__acquire(&t->lock);
4972	}
4973	thread->is_dead = true;
4974
4975	while (t) {
4976		last_t = t;
4977		active_transactions++;
4978		binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
4979			     "release %d:%d transaction %d %s, still active\n",
4980			      proc->pid, thread->pid,
4981			     t->debug_id,
4982			     (t->to_thread == thread) ? "in" : "out");
4983
4984		if (t->to_thread == thread) {
4985			thread->proc->outstanding_txns--;
4986			t->to_proc = NULL;
4987			t->to_thread = NULL;
4988			if (t->buffer) {
4989				t->buffer->transaction = NULL;
4990				t->buffer = NULL;
4991			}
4992			t = t->to_parent;
4993		} else if (t->from == thread) {
4994			t->from = NULL;
4995			t = t->from_parent;
4996		} else
4997			BUG();
4998		spin_unlock(&last_t->lock);
4999		if (t)
5000			spin_lock(&t->lock);
5001		else
5002			__acquire(&t->lock);
5003	}
5004	/* annotation for sparse, lock not acquired in last iteration above */
5005	__release(&t->lock);
5006
5007	/*
5008	 * If this thread used poll, make sure we remove the waitqueue from any
5009	 * poll data structures holding it.
 
 
5010	 */
5011	if (thread->looper & BINDER_LOOPER_STATE_POLL)
5012		wake_up_pollfree(&thread->wait);
 
 
5013
5014	binder_inner_proc_unlock(thread->proc);
5015
5016	/*
5017	 * This is needed to avoid races between wake_up_pollfree() above and
5018	 * someone else removing the last entry from the queue for other reasons
5019	 * (e.g. ep_remove_wait_queue() being called due to an epoll file
5020	 * descriptor being closed).  Such other users hold an RCU read lock, so
5021	 * we can be sure they're done after we call synchronize_rcu().
5022	 */
5023	if (thread->looper & BINDER_LOOPER_STATE_POLL)
5024		synchronize_rcu();
5025
5026	if (send_reply)
5027		binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
5028	binder_release_work(proc, &thread->todo);
5029	binder_thread_dec_tmpref(thread);
5030	return active_transactions;
5031}
5032
5033static __poll_t binder_poll(struct file *filp,
5034				struct poll_table_struct *wait)
5035{
5036	struct binder_proc *proc = filp->private_data;
5037	struct binder_thread *thread = NULL;
5038	bool wait_for_proc_work;
5039
5040	thread = binder_get_thread(proc);
5041	if (!thread)
5042		return EPOLLERR;
5043
5044	binder_inner_proc_lock(thread->proc);
5045	thread->looper |= BINDER_LOOPER_STATE_POLL;
5046	wait_for_proc_work = binder_available_for_proc_work_ilocked(thread);
5047
5048	binder_inner_proc_unlock(thread->proc);
5049
5050	poll_wait(filp, &thread->wait, wait);
5051
5052	if (binder_has_work(thread, wait_for_proc_work))
5053		return EPOLLIN;
5054
5055	return 0;
5056}
5057
5058static int binder_ioctl_write_read(struct file *filp, unsigned long arg,
 
5059				struct binder_thread *thread)
5060{
5061	int ret = 0;
5062	struct binder_proc *proc = filp->private_data;
 
5063	void __user *ubuf = (void __user *)arg;
5064	struct binder_write_read bwr;
5065
 
 
 
 
5066	if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
5067		ret = -EFAULT;
5068		goto out;
5069	}
5070	binder_debug(BINDER_DEBUG_READ_WRITE,
5071		     "%d:%d write %lld at %016llx, read %lld at %016llx\n",
5072		     proc->pid, thread->pid,
5073		     (u64)bwr.write_size, (u64)bwr.write_buffer,
5074		     (u64)bwr.read_size, (u64)bwr.read_buffer);
5075
5076	if (bwr.write_size > 0) {
5077		ret = binder_thread_write(proc, thread,
5078					  bwr.write_buffer,
5079					  bwr.write_size,
5080					  &bwr.write_consumed);
5081		trace_binder_write_done(ret);
5082		if (ret < 0) {
5083			bwr.read_consumed = 0;
5084			if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
5085				ret = -EFAULT;
5086			goto out;
5087		}
5088	}
5089	if (bwr.read_size > 0) {
5090		ret = binder_thread_read(proc, thread, bwr.read_buffer,
5091					 bwr.read_size,
5092					 &bwr.read_consumed,
5093					 filp->f_flags & O_NONBLOCK);
5094		trace_binder_read_done(ret);
5095		binder_inner_proc_lock(proc);
5096		if (!binder_worklist_empty_ilocked(&proc->todo))
5097			binder_wakeup_proc_ilocked(proc);
5098		binder_inner_proc_unlock(proc);
5099		if (ret < 0) {
5100			if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
5101				ret = -EFAULT;
5102			goto out;
5103		}
5104	}
5105	binder_debug(BINDER_DEBUG_READ_WRITE,
5106		     "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
5107		     proc->pid, thread->pid,
5108		     (u64)bwr.write_consumed, (u64)bwr.write_size,
5109		     (u64)bwr.read_consumed, (u64)bwr.read_size);
5110	if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
5111		ret = -EFAULT;
5112		goto out;
5113	}
5114out:
5115	return ret;
5116}
5117
5118static int binder_ioctl_set_ctx_mgr(struct file *filp,
5119				    struct flat_binder_object *fbo)
5120{
5121	int ret = 0;
5122	struct binder_proc *proc = filp->private_data;
5123	struct binder_context *context = proc->context;
5124	struct binder_node *new_node;
5125	kuid_t curr_euid = current_euid();
5126
5127	mutex_lock(&context->context_mgr_node_lock);
5128	if (context->binder_context_mgr_node) {
5129		pr_err("BINDER_SET_CONTEXT_MGR already set\n");
5130		ret = -EBUSY;
5131		goto out;
5132	}
5133	ret = security_binder_set_context_mgr(proc->cred);
5134	if (ret < 0)
5135		goto out;
5136	if (uid_valid(context->binder_context_mgr_uid)) {
5137		if (!uid_eq(context->binder_context_mgr_uid, curr_euid)) {
5138			pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
5139			       from_kuid(&init_user_ns, curr_euid),
5140			       from_kuid(&init_user_ns,
5141					 context->binder_context_mgr_uid));
5142			ret = -EPERM;
5143			goto out;
5144		}
5145	} else {
5146		context->binder_context_mgr_uid = curr_euid;
5147	}
5148	new_node = binder_new_node(proc, fbo);
5149	if (!new_node) {
5150		ret = -ENOMEM;
5151		goto out;
5152	}
5153	binder_node_lock(new_node);
5154	new_node->local_weak_refs++;
5155	new_node->local_strong_refs++;
5156	new_node->has_strong_ref = 1;
5157	new_node->has_weak_ref = 1;
5158	context->binder_context_mgr_node = new_node;
5159	binder_node_unlock(new_node);
5160	binder_put_node(new_node);
5161out:
5162	mutex_unlock(&context->context_mgr_node_lock);
5163	return ret;
5164}
5165
5166static int binder_ioctl_get_node_info_for_ref(struct binder_proc *proc,
5167		struct binder_node_info_for_ref *info)
5168{
5169	struct binder_node *node;
5170	struct binder_context *context = proc->context;
5171	__u32 handle = info->handle;
5172
5173	if (info->strong_count || info->weak_count || info->reserved1 ||
5174	    info->reserved2 || info->reserved3) {
5175		binder_user_error("%d BINDER_GET_NODE_INFO_FOR_REF: only handle may be non-zero.",
5176				  proc->pid);
5177		return -EINVAL;
5178	}
5179
5180	/* This ioctl may only be used by the context manager */
5181	mutex_lock(&context->context_mgr_node_lock);
5182	if (!context->binder_context_mgr_node ||
5183		context->binder_context_mgr_node->proc != proc) {
5184		mutex_unlock(&context->context_mgr_node_lock);
5185		return -EPERM;
5186	}
5187	mutex_unlock(&context->context_mgr_node_lock);
5188
5189	node = binder_get_node_from_ref(proc, handle, true, NULL);
5190	if (!node)
5191		return -EINVAL;
5192
5193	info->strong_count = node->local_strong_refs +
5194		node->internal_strong_refs;
5195	info->weak_count = node->local_weak_refs;
5196
5197	binder_put_node(node);
5198
5199	return 0;
5200}
5201
5202static int binder_ioctl_get_node_debug_info(struct binder_proc *proc,
5203				struct binder_node_debug_info *info)
5204{
5205	struct rb_node *n;
5206	binder_uintptr_t ptr = info->ptr;
5207
5208	memset(info, 0, sizeof(*info));
5209
5210	binder_inner_proc_lock(proc);
5211	for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
5212		struct binder_node *node = rb_entry(n, struct binder_node,
5213						    rb_node);
5214		if (node->ptr > ptr) {
5215			info->ptr = node->ptr;
5216			info->cookie = node->cookie;
5217			info->has_strong_ref = node->has_strong_ref;
5218			info->has_weak_ref = node->has_weak_ref;
5219			break;
5220		}
5221	}
5222	binder_inner_proc_unlock(proc);
5223
5224	return 0;
5225}
5226
5227static bool binder_txns_pending_ilocked(struct binder_proc *proc)
5228{
5229	struct rb_node *n;
5230	struct binder_thread *thread;
5231
5232	if (proc->outstanding_txns > 0)
5233		return true;
5234
5235	for (n = rb_first(&proc->threads); n; n = rb_next(n)) {
5236		thread = rb_entry(n, struct binder_thread, rb_node);
5237		if (thread->transaction_stack)
5238			return true;
5239	}
5240	return false;
5241}
5242
5243static int binder_ioctl_freeze(struct binder_freeze_info *info,
5244			       struct binder_proc *target_proc)
5245{
5246	int ret = 0;
5247
5248	if (!info->enable) {
5249		binder_inner_proc_lock(target_proc);
5250		target_proc->sync_recv = false;
5251		target_proc->async_recv = false;
5252		target_proc->is_frozen = false;
5253		binder_inner_proc_unlock(target_proc);
5254		return 0;
5255	}
5256
5257	/*
5258	 * Freezing the target. Prevent new transactions by
5259	 * setting frozen state. If timeout specified, wait
5260	 * for transactions to drain.
5261	 */
5262	binder_inner_proc_lock(target_proc);
5263	target_proc->sync_recv = false;
5264	target_proc->async_recv = false;
5265	target_proc->is_frozen = true;
5266	binder_inner_proc_unlock(target_proc);
5267
5268	if (info->timeout_ms > 0)
5269		ret = wait_event_interruptible_timeout(
5270			target_proc->freeze_wait,
5271			(!target_proc->outstanding_txns),
5272			msecs_to_jiffies(info->timeout_ms));
5273
5274	/* Check pending transactions that wait for reply */
5275	if (ret >= 0) {
5276		binder_inner_proc_lock(target_proc);
5277		if (binder_txns_pending_ilocked(target_proc))
5278			ret = -EAGAIN;
5279		binder_inner_proc_unlock(target_proc);
5280	}
5281
5282	if (ret < 0) {
5283		binder_inner_proc_lock(target_proc);
5284		target_proc->is_frozen = false;
5285		binder_inner_proc_unlock(target_proc);
5286	}
5287
5288	return ret;
5289}
5290
5291static int binder_ioctl_get_freezer_info(
5292				struct binder_frozen_status_info *info)
5293{
5294	struct binder_proc *target_proc;
5295	bool found = false;
5296	__u32 txns_pending;
5297
5298	info->sync_recv = 0;
5299	info->async_recv = 0;
5300
5301	mutex_lock(&binder_procs_lock);
5302	hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
5303		if (target_proc->pid == info->pid) {
5304			found = true;
5305			binder_inner_proc_lock(target_proc);
5306			txns_pending = binder_txns_pending_ilocked(target_proc);
5307			info->sync_recv |= target_proc->sync_recv |
5308					(txns_pending << 1);
5309			info->async_recv |= target_proc->async_recv;
5310			binder_inner_proc_unlock(target_proc);
5311		}
5312	}
5313	mutex_unlock(&binder_procs_lock);
5314
5315	if (!found)
5316		return -EINVAL;
5317
5318	return 0;
5319}
5320
5321static int binder_ioctl_get_extended_error(struct binder_thread *thread,
5322					   void __user *ubuf)
5323{
5324	struct binder_extended_error ee;
5325
5326	binder_inner_proc_lock(thread->proc);
5327	ee = thread->ee;
5328	binder_set_extended_error(&thread->ee, 0, BR_OK, 0);
5329	binder_inner_proc_unlock(thread->proc);
5330
5331	if (copy_to_user(ubuf, &ee, sizeof(ee)))
5332		return -EFAULT;
5333
5334	return 0;
5335}
5336
5337static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
5338{
5339	int ret;
5340	struct binder_proc *proc = filp->private_data;
5341	struct binder_thread *thread;
 
5342	void __user *ubuf = (void __user *)arg;
5343
5344	/*pr_info("binder_ioctl: %d:%d %x %lx\n",
5345			proc->pid, current->pid, cmd, arg);*/
5346
5347	binder_selftest_alloc(&proc->alloc);
5348
5349	trace_binder_ioctl(cmd, arg);
5350
5351	ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
5352	if (ret)
5353		goto err_unlocked;
5354
5355	thread = binder_get_thread(proc);
5356	if (thread == NULL) {
5357		ret = -ENOMEM;
5358		goto err;
5359	}
5360
5361	switch (cmd) {
5362	case BINDER_WRITE_READ:
5363		ret = binder_ioctl_write_read(filp, arg, thread);
5364		if (ret)
5365			goto err;
5366		break;
5367	case BINDER_SET_MAX_THREADS: {
5368		int max_threads;
5369
5370		if (copy_from_user(&max_threads, ubuf,
5371				   sizeof(max_threads))) {
5372			ret = -EINVAL;
5373			goto err;
5374		}
5375		binder_inner_proc_lock(proc);
5376		proc->max_threads = max_threads;
5377		binder_inner_proc_unlock(proc);
5378		break;
5379	}
5380	case BINDER_SET_CONTEXT_MGR_EXT: {
5381		struct flat_binder_object fbo;
5382
5383		if (copy_from_user(&fbo, ubuf, sizeof(fbo))) {
5384			ret = -EINVAL;
5385			goto err;
5386		}
5387		ret = binder_ioctl_set_ctx_mgr(filp, &fbo);
5388		if (ret)
5389			goto err;
5390		break;
5391	}
5392	case BINDER_SET_CONTEXT_MGR:
5393		ret = binder_ioctl_set_ctx_mgr(filp, NULL);
5394		if (ret)
5395			goto err;
5396		break;
5397	case BINDER_THREAD_EXIT:
5398		binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
5399			     proc->pid, thread->pid);
5400		binder_thread_release(proc, thread);
5401		thread = NULL;
5402		break;
5403	case BINDER_VERSION: {
5404		struct binder_version __user *ver = ubuf;
5405
 
 
 
 
5406		if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
5407			     &ver->protocol_version)) {
5408			ret = -EINVAL;
5409			goto err;
5410		}
5411		break;
5412	}
5413	case BINDER_GET_NODE_INFO_FOR_REF: {
5414		struct binder_node_info_for_ref info;
5415
5416		if (copy_from_user(&info, ubuf, sizeof(info))) {
5417			ret = -EFAULT;
5418			goto err;
5419		}
5420
5421		ret = binder_ioctl_get_node_info_for_ref(proc, &info);
5422		if (ret < 0)
5423			goto err;
5424
5425		if (copy_to_user(ubuf, &info, sizeof(info))) {
5426			ret = -EFAULT;
5427			goto err;
5428		}
5429
5430		break;
5431	}
5432	case BINDER_GET_NODE_DEBUG_INFO: {
5433		struct binder_node_debug_info info;
5434
5435		if (copy_from_user(&info, ubuf, sizeof(info))) {
5436			ret = -EFAULT;
5437			goto err;
5438		}
5439
5440		ret = binder_ioctl_get_node_debug_info(proc, &info);
5441		if (ret < 0)
5442			goto err;
5443
5444		if (copy_to_user(ubuf, &info, sizeof(info))) {
5445			ret = -EFAULT;
5446			goto err;
5447		}
5448		break;
5449	}
5450	case BINDER_FREEZE: {
5451		struct binder_freeze_info info;
5452		struct binder_proc **target_procs = NULL, *target_proc;
5453		int target_procs_count = 0, i = 0;
5454
5455		ret = 0;
5456
5457		if (copy_from_user(&info, ubuf, sizeof(info))) {
5458			ret = -EFAULT;
5459			goto err;
5460		}
5461
5462		mutex_lock(&binder_procs_lock);
5463		hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
5464			if (target_proc->pid == info.pid)
5465				target_procs_count++;
5466		}
5467
5468		if (target_procs_count == 0) {
5469			mutex_unlock(&binder_procs_lock);
5470			ret = -EINVAL;
5471			goto err;
5472		}
5473
5474		target_procs = kcalloc(target_procs_count,
5475				       sizeof(struct binder_proc *),
5476				       GFP_KERNEL);
5477
5478		if (!target_procs) {
5479			mutex_unlock(&binder_procs_lock);
5480			ret = -ENOMEM;
5481			goto err;
5482		}
5483
5484		hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
5485			if (target_proc->pid != info.pid)
5486				continue;
5487
5488			binder_inner_proc_lock(target_proc);
5489			target_proc->tmp_ref++;
5490			binder_inner_proc_unlock(target_proc);
5491
5492			target_procs[i++] = target_proc;
5493		}
5494		mutex_unlock(&binder_procs_lock);
5495
5496		for (i = 0; i < target_procs_count; i++) {
5497			if (ret >= 0)
5498				ret = binder_ioctl_freeze(&info,
5499							  target_procs[i]);
5500
5501			binder_proc_dec_tmpref(target_procs[i]);
5502		}
5503
5504		kfree(target_procs);
5505
5506		if (ret < 0)
5507			goto err;
5508		break;
5509	}
5510	case BINDER_GET_FROZEN_INFO: {
5511		struct binder_frozen_status_info info;
5512
5513		if (copy_from_user(&info, ubuf, sizeof(info))) {
5514			ret = -EFAULT;
5515			goto err;
5516		}
5517
5518		ret = binder_ioctl_get_freezer_info(&info);
5519		if (ret < 0)
5520			goto err;
5521
5522		if (copy_to_user(ubuf, &info, sizeof(info))) {
5523			ret = -EFAULT;
5524			goto err;
5525		}
5526		break;
5527	}
5528	case BINDER_ENABLE_ONEWAY_SPAM_DETECTION: {
5529		uint32_t enable;
5530
5531		if (copy_from_user(&enable, ubuf, sizeof(enable))) {
5532			ret = -EFAULT;
5533			goto err;
5534		}
5535		binder_inner_proc_lock(proc);
5536		proc->oneway_spam_detection_enabled = (bool)enable;
5537		binder_inner_proc_unlock(proc);
5538		break;
5539	}
5540	case BINDER_GET_EXTENDED_ERROR:
5541		ret = binder_ioctl_get_extended_error(thread, ubuf);
5542		if (ret < 0)
5543			goto err;
5544		break;
5545	default:
5546		ret = -EINVAL;
5547		goto err;
5548	}
5549	ret = 0;
5550err:
5551	if (thread)
5552		thread->looper_need_return = false;
5553	wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
5554	if (ret && ret != -EINTR)
5555		pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
5556err_unlocked:
5557	trace_binder_ioctl_done(ret);
5558	return ret;
5559}
5560
5561static void binder_vma_open(struct vm_area_struct *vma)
5562{
5563	struct binder_proc *proc = vma->vm_private_data;
5564
5565	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
5566		     "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
5567		     proc->pid, vma->vm_start, vma->vm_end,
5568		     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
5569		     (unsigned long)pgprot_val(vma->vm_page_prot));
5570}
5571
5572static void binder_vma_close(struct vm_area_struct *vma)
5573{
5574	struct binder_proc *proc = vma->vm_private_data;
5575
5576	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
5577		     "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
5578		     proc->pid, vma->vm_start, vma->vm_end,
5579		     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
5580		     (unsigned long)pgprot_val(vma->vm_page_prot));
5581	binder_alloc_vma_close(&proc->alloc);
5582}
5583
5584static vm_fault_t binder_vm_fault(struct vm_fault *vmf)
5585{
5586	return VM_FAULT_SIGBUS;
5587}
5588
5589static const struct vm_operations_struct binder_vm_ops = {
5590	.open = binder_vma_open,
5591	.close = binder_vma_close,
5592	.fault = binder_vm_fault,
5593};
5594
5595static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
5596{
 
5597	struct binder_proc *proc = filp->private_data;
 
5598
5599	if (proc->tsk != current->group_leader)
5600		return -EINVAL;
5601
5602	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
5603		     "%s: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
5604		     __func__, proc->pid, vma->vm_start, vma->vm_end,
5605		     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
5606		     (unsigned long)pgprot_val(vma->vm_page_prot));
5607
5608	if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
5609		pr_err("%s: %d %lx-%lx %s failed %d\n", __func__,
5610		       proc->pid, vma->vm_start, vma->vm_end, "bad vm_flags", -EPERM);
5611		return -EPERM;
5612	}
5613	vm_flags_mod(vma, VM_DONTCOPY | VM_MIXEDMAP, VM_MAYWRITE);
 
5614
5615	vma->vm_ops = &binder_vm_ops;
5616	vma->vm_private_data = proc;
5617
5618	return binder_alloc_mmap_handler(&proc->alloc, vma);
 
 
 
 
 
 
 
 
5619}
5620
5621static int binder_open(struct inode *nodp, struct file *filp)
5622{
5623	struct binder_proc *proc, *itr;
5624	struct binder_device *binder_dev;
5625	struct binderfs_info *info;
5626	struct dentry *binder_binderfs_dir_entry_proc = NULL;
5627	bool existing_pid = false;
5628
5629	binder_debug(BINDER_DEBUG_OPEN_CLOSE, "%s: %d:%d\n", __func__,
5630		     current->group_leader->pid, current->pid);
5631
5632	proc = kzalloc(sizeof(*proc), GFP_KERNEL);
5633	if (proc == NULL)
5634		return -ENOMEM;
5635	spin_lock_init(&proc->inner_lock);
5636	spin_lock_init(&proc->outer_lock);
5637	get_task_struct(current->group_leader);
5638	proc->tsk = current->group_leader;
5639	proc->cred = get_cred(filp->f_cred);
5640	INIT_LIST_HEAD(&proc->todo);
5641	init_waitqueue_head(&proc->freeze_wait);
5642	proc->default_priority = task_nice(current);
5643	/* binderfs stashes devices in i_private */
5644	if (is_binderfs_device(nodp)) {
5645		binder_dev = nodp->i_private;
5646		info = nodp->i_sb->s_fs_info;
5647		binder_binderfs_dir_entry_proc = info->proc_log_dir;
5648	} else {
5649		binder_dev = container_of(filp->private_data,
5650					  struct binder_device, miscdev);
5651	}
5652	refcount_inc(&binder_dev->ref);
5653	proc->context = &binder_dev->context;
5654	binder_alloc_init(&proc->alloc);
5655
5656	binder_stats_created(BINDER_STAT_PROC);
5657	proc->pid = current->group_leader->pid;
5658	INIT_LIST_HEAD(&proc->delivered_death);
5659	INIT_LIST_HEAD(&proc->waiting_threads);
5660	filp->private_data = proc;
5661
5662	mutex_lock(&binder_procs_lock);
5663	hlist_for_each_entry(itr, &binder_procs, proc_node) {
5664		if (itr->pid == proc->pid) {
5665			existing_pid = true;
5666			break;
5667		}
5668	}
5669	hlist_add_head(&proc->proc_node, &binder_procs);
5670	mutex_unlock(&binder_procs_lock);
5671
5672	if (binder_debugfs_dir_entry_proc && !existing_pid) {
5673		char strbuf[11];
5674
5675		snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
5676		/*
5677		 * proc debug entries are shared between contexts.
5678		 * Only create for the first PID to avoid debugfs log spamming
5679		 * The printing code will anyway print all contexts for a given
5680		 * PID so this is not a problem.
 
5681		 */
5682		proc->debugfs_entry = debugfs_create_file(strbuf, 0444,
5683			binder_debugfs_dir_entry_proc,
5684			(void *)(unsigned long)proc->pid,
5685			&proc_fops);
5686	}
5687
5688	if (binder_binderfs_dir_entry_proc && !existing_pid) {
5689		char strbuf[11];
5690		struct dentry *binderfs_entry;
5691
5692		snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
5693		/*
5694		 * Similar to debugfs, the process specific log file is shared
5695		 * between contexts. Only create for the first PID.
5696		 * This is ok since same as debugfs, the log file will contain
5697		 * information on all contexts of a given PID.
 
 
 
5698		 */
5699		binderfs_entry = binderfs_create_file(binder_binderfs_dir_entry_proc,
5700			strbuf, &proc_fops, (void *)(unsigned long)proc->pid);
5701		if (!IS_ERR(binderfs_entry)) {
5702			proc->binderfs_entry = binderfs_entry;
5703		} else {
5704			int error;
5705
5706			error = PTR_ERR(binderfs_entry);
5707			pr_warn("Unable to create file %s in binderfs (error %d)\n",
5708				strbuf, error);
 
 
5709		}
5710	}
5711
5712	return 0;
5713}
5714
5715static int binder_flush(struct file *filp, fl_owner_t id)
5716{
5717	struct binder_proc *proc = filp->private_data;
5718
5719	binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
5720
5721	return 0;
5722}
5723
5724static void binder_deferred_flush(struct binder_proc *proc)
5725{
5726	struct rb_node *n;
5727	int wake_count = 0;
5728
5729	binder_inner_proc_lock(proc);
5730	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
5731		struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
5732
5733		thread->looper_need_return = true;
5734		if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
5735			wake_up_interruptible(&thread->wait);
5736			wake_count++;
5737		}
5738	}
5739	binder_inner_proc_unlock(proc);
5740
5741	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
5742		     "binder_flush: %d woke %d threads\n", proc->pid,
5743		     wake_count);
5744}
5745
5746static int binder_release(struct inode *nodp, struct file *filp)
5747{
5748	struct binder_proc *proc = filp->private_data;
5749
5750	debugfs_remove(proc->debugfs_entry);
5751
5752	if (proc->binderfs_entry) {
5753		binderfs_remove_file(proc->binderfs_entry);
5754		proc->binderfs_entry = NULL;
5755	}
5756
5757	binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
5758
5759	return 0;
5760}
5761
5762static int binder_node_release(struct binder_node *node, int refs)
5763{
5764	struct binder_ref *ref;
5765	int death = 0;
5766	struct binder_proc *proc = node->proc;
5767
5768	binder_release_work(proc, &node->async_todo);
5769
5770	binder_node_lock(node);
5771	binder_inner_proc_lock(proc);
5772	binder_dequeue_work_ilocked(&node->work);
5773	/*
5774	 * The caller must have taken a temporary ref on the node,
5775	 */
5776	BUG_ON(!node->tmp_refs);
5777	if (hlist_empty(&node->refs) && node->tmp_refs == 1) {
5778		binder_inner_proc_unlock(proc);
5779		binder_node_unlock(node);
5780		binder_free_node(node);
5781
5782		return refs;
5783	}
5784
5785	node->proc = NULL;
5786	node->local_strong_refs = 0;
5787	node->local_weak_refs = 0;
5788	binder_inner_proc_unlock(proc);
5789
5790	spin_lock(&binder_dead_nodes_lock);
5791	hlist_add_head(&node->dead_node, &binder_dead_nodes);
5792	spin_unlock(&binder_dead_nodes_lock);
5793
5794	hlist_for_each_entry(ref, &node->refs, node_entry) {
5795		refs++;
5796		/*
5797		 * Need the node lock to synchronize
5798		 * with new notification requests and the
5799		 * inner lock to synchronize with queued
5800		 * death notifications.
5801		 */
5802		binder_inner_proc_lock(ref->proc);
5803		if (!ref->death) {
5804			binder_inner_proc_unlock(ref->proc);
5805			continue;
5806		}
5807
5808		death++;
5809
5810		BUG_ON(!list_empty(&ref->death->work.entry));
5811		ref->death->work.type = BINDER_WORK_DEAD_BINDER;
5812		binder_enqueue_work_ilocked(&ref->death->work,
5813					    &ref->proc->todo);
5814		binder_wakeup_proc_ilocked(ref->proc);
5815		binder_inner_proc_unlock(ref->proc);
5816	}
5817
5818	binder_debug(BINDER_DEBUG_DEAD_BINDER,
5819		     "node %d now dead, refs %d, death %d\n",
5820		     node->debug_id, refs, death);
5821	binder_node_unlock(node);
5822	binder_put_node(node);
5823
5824	return refs;
5825}
5826
5827static void binder_deferred_release(struct binder_proc *proc)
5828{
5829	struct binder_context *context = proc->context;
5830	struct rb_node *n;
5831	int threads, nodes, incoming_refs, outgoing_refs, active_transactions;
5832
5833	mutex_lock(&binder_procs_lock);
5834	hlist_del(&proc->proc_node);
5835	mutex_unlock(&binder_procs_lock);
5836
5837	mutex_lock(&context->context_mgr_node_lock);
5838	if (context->binder_context_mgr_node &&
5839	    context->binder_context_mgr_node->proc == proc) {
5840		binder_debug(BINDER_DEBUG_DEAD_BINDER,
5841			     "%s: %d context_mgr_node gone\n",
5842			     __func__, proc->pid);
5843		context->binder_context_mgr_node = NULL;
5844	}
5845	mutex_unlock(&context->context_mgr_node_lock);
5846	binder_inner_proc_lock(proc);
5847	/*
5848	 * Make sure proc stays alive after we
5849	 * remove all the threads
5850	 */
5851	proc->tmp_ref++;
5852
5853	proc->is_dead = true;
5854	proc->is_frozen = false;
5855	proc->sync_recv = false;
5856	proc->async_recv = false;
5857	threads = 0;
5858	active_transactions = 0;
5859	while ((n = rb_first(&proc->threads))) {
5860		struct binder_thread *thread;
5861
5862		thread = rb_entry(n, struct binder_thread, rb_node);
5863		binder_inner_proc_unlock(proc);
5864		threads++;
5865		active_transactions += binder_thread_release(proc, thread);
5866		binder_inner_proc_lock(proc);
5867	}
5868
5869	nodes = 0;
5870	incoming_refs = 0;
5871	while ((n = rb_first(&proc->nodes))) {
5872		struct binder_node *node;
5873
5874		node = rb_entry(n, struct binder_node, rb_node);
5875		nodes++;
5876		/*
5877		 * take a temporary ref on the node before
5878		 * calling binder_node_release() which will either
5879		 * kfree() the node or call binder_put_node()
5880		 */
5881		binder_inc_node_tmpref_ilocked(node);
5882		rb_erase(&node->rb_node, &proc->nodes);
5883		binder_inner_proc_unlock(proc);
5884		incoming_refs = binder_node_release(node, incoming_refs);
5885		binder_inner_proc_lock(proc);
5886	}
5887	binder_inner_proc_unlock(proc);
5888
5889	outgoing_refs = 0;
5890	binder_proc_lock(proc);
5891	while ((n = rb_first(&proc->refs_by_desc))) {
5892		struct binder_ref *ref;
5893
5894		ref = rb_entry(n, struct binder_ref, rb_node_desc);
5895		outgoing_refs++;
5896		binder_cleanup_ref_olocked(ref);
5897		binder_proc_unlock(proc);
5898		binder_free_ref(ref);
5899		binder_proc_lock(proc);
5900	}
5901	binder_proc_unlock(proc);
5902
5903	binder_release_work(proc, &proc->todo);
5904	binder_release_work(proc, &proc->delivered_death);
5905
5906	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
5907		     "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d\n",
5908		     __func__, proc->pid, threads, nodes, incoming_refs,
5909		     outgoing_refs, active_transactions);
5910
5911	binder_proc_dec_tmpref(proc);
5912}
5913
5914static void binder_deferred_func(struct work_struct *work)
5915{
5916	struct binder_proc *proc;
5917
5918	int defer;
5919
5920	do {
5921		mutex_lock(&binder_deferred_lock);
5922		if (!hlist_empty(&binder_deferred_list)) {
5923			proc = hlist_entry(binder_deferred_list.first,
5924					struct binder_proc, deferred_work_node);
5925			hlist_del_init(&proc->deferred_work_node);
5926			defer = proc->deferred_work;
5927			proc->deferred_work = 0;
5928		} else {
5929			proc = NULL;
5930			defer = 0;
5931		}
5932		mutex_unlock(&binder_deferred_lock);
5933
5934		if (defer & BINDER_DEFERRED_FLUSH)
5935			binder_deferred_flush(proc);
5936
5937		if (defer & BINDER_DEFERRED_RELEASE)
5938			binder_deferred_release(proc); /* frees proc */
5939	} while (proc);
5940}
5941static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
5942
5943static void
5944binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
5945{
5946	mutex_lock(&binder_deferred_lock);
5947	proc->deferred_work |= defer;
5948	if (hlist_unhashed(&proc->deferred_work_node)) {
5949		hlist_add_head(&proc->deferred_work_node,
5950				&binder_deferred_list);
5951		schedule_work(&binder_deferred_work);
5952	}
5953	mutex_unlock(&binder_deferred_lock);
5954}
5955
5956static void print_binder_transaction_ilocked(struct seq_file *m,
5957					     struct binder_proc *proc,
5958					     const char *prefix,
5959					     struct binder_transaction *t)
5960{
5961	struct binder_proc *to_proc;
5962	struct binder_buffer *buffer = t->buffer;
5963	ktime_t current_time = ktime_get();
5964
5965	spin_lock(&t->lock);
5966	to_proc = t->to_proc;
5967	seq_printf(m,
5968		   "%s %d: %pK from %d:%d to %d:%d code %x flags %x pri %ld r%d elapsed %lldms",
5969		   prefix, t->debug_id, t,
5970		   t->from_pid,
5971		   t->from_tid,
5972		   to_proc ? to_proc->pid : 0,
5973		   t->to_thread ? t->to_thread->pid : 0,
5974		   t->code, t->flags, t->priority, t->need_reply,
5975		   ktime_ms_delta(current_time, t->start_time));
5976	spin_unlock(&t->lock);
5977
5978	if (proc != to_proc) {
5979		/*
5980		 * Can only safely deref buffer if we are holding the
5981		 * correct proc inner lock for this node
5982		 */
5983		seq_puts(m, "\n");
5984		return;
5985	}
5986
5987	if (buffer == NULL) {
5988		seq_puts(m, " buffer free\n");
5989		return;
5990	}
5991	if (buffer->target_node)
5992		seq_printf(m, " node %d", buffer->target_node->debug_id);
5993	seq_printf(m, " size %zd:%zd offset %lx\n",
5994		   buffer->data_size, buffer->offsets_size,
5995		   proc->alloc.buffer - buffer->user_data);
5996}
5997
5998static void print_binder_work_ilocked(struct seq_file *m,
5999				     struct binder_proc *proc,
6000				     const char *prefix,
6001				     const char *transaction_prefix,
6002				     struct binder_work *w)
6003{
6004	struct binder_node *node;
6005	struct binder_transaction *t;
6006
6007	switch (w->type) {
6008	case BINDER_WORK_TRANSACTION:
6009		t = container_of(w, struct binder_transaction, work);
6010		print_binder_transaction_ilocked(
6011				m, proc, transaction_prefix, t);
6012		break;
6013	case BINDER_WORK_RETURN_ERROR: {
6014		struct binder_error *e = container_of(
6015				w, struct binder_error, work);
6016
6017		seq_printf(m, "%stransaction error: %u\n",
6018			   prefix, e->cmd);
6019	} break;
6020	case BINDER_WORK_TRANSACTION_COMPLETE:
6021		seq_printf(m, "%stransaction complete\n", prefix);
6022		break;
6023	case BINDER_WORK_NODE:
6024		node = container_of(w, struct binder_node, work);
6025		seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
6026			   prefix, node->debug_id,
6027			   (u64)node->ptr, (u64)node->cookie);
6028		break;
6029	case BINDER_WORK_DEAD_BINDER:
6030		seq_printf(m, "%shas dead binder\n", prefix);
6031		break;
6032	case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
6033		seq_printf(m, "%shas cleared dead binder\n", prefix);
6034		break;
6035	case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
6036		seq_printf(m, "%shas cleared death notification\n", prefix);
6037		break;
6038	default:
6039		seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
6040		break;
6041	}
6042}
6043
6044static void print_binder_thread_ilocked(struct seq_file *m,
6045					struct binder_thread *thread,
6046					int print_always)
6047{
6048	struct binder_transaction *t;
6049	struct binder_work *w;
6050	size_t start_pos = m->count;
6051	size_t header_pos;
6052
6053	seq_printf(m, "  thread %d: l %02x need_return %d tr %d\n",
6054			thread->pid, thread->looper,
6055			thread->looper_need_return,
6056			atomic_read(&thread->tmp_ref));
6057	header_pos = m->count;
6058	t = thread->transaction_stack;
6059	while (t) {
6060		if (t->from == thread) {
6061			print_binder_transaction_ilocked(m, thread->proc,
6062					"    outgoing transaction", t);
6063			t = t->from_parent;
6064		} else if (t->to_thread == thread) {
6065			print_binder_transaction_ilocked(m, thread->proc,
6066						 "    incoming transaction", t);
6067			t = t->to_parent;
6068		} else {
6069			print_binder_transaction_ilocked(m, thread->proc,
6070					"    bad transaction", t);
6071			t = NULL;
6072		}
6073	}
6074	list_for_each_entry(w, &thread->todo, entry) {
6075		print_binder_work_ilocked(m, thread->proc, "    ",
6076					  "    pending transaction", w);
6077	}
6078	if (!print_always && m->count == header_pos)
6079		m->count = start_pos;
6080}
6081
6082static void print_binder_node_nilocked(struct seq_file *m,
6083				       struct binder_node *node)
6084{
6085	struct binder_ref *ref;
6086	struct binder_work *w;
6087	int count;
6088
6089	count = 0;
6090	hlist_for_each_entry(ref, &node->refs, node_entry)
6091		count++;
6092
6093	seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d tr %d",
6094		   node->debug_id, (u64)node->ptr, (u64)node->cookie,
6095		   node->has_strong_ref, node->has_weak_ref,
6096		   node->local_strong_refs, node->local_weak_refs,
6097		   node->internal_strong_refs, count, node->tmp_refs);
6098	if (count) {
6099		seq_puts(m, " proc");
6100		hlist_for_each_entry(ref, &node->refs, node_entry)
6101			seq_printf(m, " %d", ref->proc->pid);
6102	}
6103	seq_puts(m, "\n");
6104	if (node->proc) {
6105		list_for_each_entry(w, &node->async_todo, entry)
6106			print_binder_work_ilocked(m, node->proc, "    ",
6107					  "    pending async transaction", w);
6108	}
6109}
6110
6111static void print_binder_ref_olocked(struct seq_file *m,
6112				     struct binder_ref *ref)
6113{
6114	binder_node_lock(ref->node);
6115	seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %pK\n",
6116		   ref->data.debug_id, ref->data.desc,
6117		   ref->node->proc ? "" : "dead ",
6118		   ref->node->debug_id, ref->data.strong,
6119		   ref->data.weak, ref->death);
6120	binder_node_unlock(ref->node);
6121}
6122
6123static void print_binder_proc(struct seq_file *m,
6124			      struct binder_proc *proc, int print_all)
6125{
6126	struct binder_work *w;
6127	struct rb_node *n;
6128	size_t start_pos = m->count;
6129	size_t header_pos;
6130	struct binder_node *last_node = NULL;
6131
6132	seq_printf(m, "proc %d\n", proc->pid);
6133	seq_printf(m, "context %s\n", proc->context->name);
6134	header_pos = m->count;
6135
6136	binder_inner_proc_lock(proc);
6137	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
6138		print_binder_thread_ilocked(m, rb_entry(n, struct binder_thread,
6139						rb_node), print_all);
6140
6141	for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
6142		struct binder_node *node = rb_entry(n, struct binder_node,
6143						    rb_node);
6144		if (!print_all && !node->has_async_transaction)
6145			continue;
6146
6147		/*
6148		 * take a temporary reference on the node so it
6149		 * survives and isn't removed from the tree
6150		 * while we print it.
6151		 */
6152		binder_inc_node_tmpref_ilocked(node);
6153		/* Need to drop inner lock to take node lock */
6154		binder_inner_proc_unlock(proc);
6155		if (last_node)
6156			binder_put_node(last_node);
6157		binder_node_inner_lock(node);
6158		print_binder_node_nilocked(m, node);
6159		binder_node_inner_unlock(node);
6160		last_node = node;
6161		binder_inner_proc_lock(proc);
6162	}
6163	binder_inner_proc_unlock(proc);
6164	if (last_node)
6165		binder_put_node(last_node);
6166
6167	if (print_all) {
6168		binder_proc_lock(proc);
6169		for (n = rb_first(&proc->refs_by_desc);
6170		     n != NULL;
6171		     n = rb_next(n))
6172			print_binder_ref_olocked(m, rb_entry(n,
6173							    struct binder_ref,
6174							    rb_node_desc));
6175		binder_proc_unlock(proc);
6176	}
6177	binder_alloc_print_allocated(m, &proc->alloc);
6178	binder_inner_proc_lock(proc);
6179	list_for_each_entry(w, &proc->todo, entry)
6180		print_binder_work_ilocked(m, proc, "  ",
6181					  "  pending transaction", w);
6182	list_for_each_entry(w, &proc->delivered_death, entry) {
6183		seq_puts(m, "  has delivered dead binder\n");
6184		break;
6185	}
6186	binder_inner_proc_unlock(proc);
6187	if (!print_all && m->count == header_pos)
6188		m->count = start_pos;
6189}
6190
6191static const char * const binder_return_strings[] = {
6192	"BR_ERROR",
6193	"BR_OK",
6194	"BR_TRANSACTION",
6195	"BR_REPLY",
6196	"BR_ACQUIRE_RESULT",
6197	"BR_DEAD_REPLY",
6198	"BR_TRANSACTION_COMPLETE",
6199	"BR_INCREFS",
6200	"BR_ACQUIRE",
6201	"BR_RELEASE",
6202	"BR_DECREFS",
6203	"BR_ATTEMPT_ACQUIRE",
6204	"BR_NOOP",
6205	"BR_SPAWN_LOOPER",
6206	"BR_FINISHED",
6207	"BR_DEAD_BINDER",
6208	"BR_CLEAR_DEATH_NOTIFICATION_DONE",
6209	"BR_FAILED_REPLY",
6210	"BR_FROZEN_REPLY",
6211	"BR_ONEWAY_SPAM_SUSPECT",
6212	"BR_TRANSACTION_PENDING_FROZEN"
6213};
6214
6215static const char * const binder_command_strings[] = {
6216	"BC_TRANSACTION",
6217	"BC_REPLY",
6218	"BC_ACQUIRE_RESULT",
6219	"BC_FREE_BUFFER",
6220	"BC_INCREFS",
6221	"BC_ACQUIRE",
6222	"BC_RELEASE",
6223	"BC_DECREFS",
6224	"BC_INCREFS_DONE",
6225	"BC_ACQUIRE_DONE",
6226	"BC_ATTEMPT_ACQUIRE",
6227	"BC_REGISTER_LOOPER",
6228	"BC_ENTER_LOOPER",
6229	"BC_EXIT_LOOPER",
6230	"BC_REQUEST_DEATH_NOTIFICATION",
6231	"BC_CLEAR_DEATH_NOTIFICATION",
6232	"BC_DEAD_BINDER_DONE",
6233	"BC_TRANSACTION_SG",
6234	"BC_REPLY_SG",
6235};
6236
6237static const char * const binder_objstat_strings[] = {
6238	"proc",
6239	"thread",
6240	"node",
6241	"ref",
6242	"death",
6243	"transaction",
6244	"transaction_complete"
6245};
6246
6247static void print_binder_stats(struct seq_file *m, const char *prefix,
6248			       struct binder_stats *stats)
6249{
6250	int i;
6251
6252	BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
6253		     ARRAY_SIZE(binder_command_strings));
6254	for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
6255		int temp = atomic_read(&stats->bc[i]);
6256
6257		if (temp)
6258			seq_printf(m, "%s%s: %d\n", prefix,
6259				   binder_command_strings[i], temp);
6260	}
6261
6262	BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
6263		     ARRAY_SIZE(binder_return_strings));
6264	for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
6265		int temp = atomic_read(&stats->br[i]);
6266
6267		if (temp)
6268			seq_printf(m, "%s%s: %d\n", prefix,
6269				   binder_return_strings[i], temp);
6270	}
6271
6272	BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
6273		     ARRAY_SIZE(binder_objstat_strings));
6274	BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
6275		     ARRAY_SIZE(stats->obj_deleted));
6276	for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
6277		int created = atomic_read(&stats->obj_created[i]);
6278		int deleted = atomic_read(&stats->obj_deleted[i]);
6279
6280		if (created || deleted)
6281			seq_printf(m, "%s%s: active %d total %d\n",
6282				prefix,
6283				binder_objstat_strings[i],
6284				created - deleted,
6285				created);
6286	}
6287}
6288
6289static void print_binder_proc_stats(struct seq_file *m,
6290				    struct binder_proc *proc)
6291{
6292	struct binder_work *w;
6293	struct binder_thread *thread;
6294	struct rb_node *n;
6295	int count, strong, weak, ready_threads;
6296	size_t free_async_space =
6297		binder_alloc_get_free_async_space(&proc->alloc);
6298
6299	seq_printf(m, "proc %d\n", proc->pid);
6300	seq_printf(m, "context %s\n", proc->context->name);
6301	count = 0;
6302	ready_threads = 0;
6303	binder_inner_proc_lock(proc);
6304	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
6305		count++;
6306
6307	list_for_each_entry(thread, &proc->waiting_threads, waiting_thread_node)
6308		ready_threads++;
6309
6310	seq_printf(m, "  threads: %d\n", count);
6311	seq_printf(m, "  requested threads: %d+%d/%d\n"
6312			"  ready threads %d\n"
6313			"  free async space %zd\n", proc->requested_threads,
6314			proc->requested_threads_started, proc->max_threads,
6315			ready_threads,
6316			free_async_space);
6317	count = 0;
6318	for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
6319		count++;
6320	binder_inner_proc_unlock(proc);
6321	seq_printf(m, "  nodes: %d\n", count);
6322	count = 0;
6323	strong = 0;
6324	weak = 0;
6325	binder_proc_lock(proc);
6326	for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
6327		struct binder_ref *ref = rb_entry(n, struct binder_ref,
6328						  rb_node_desc);
6329		count++;
6330		strong += ref->data.strong;
6331		weak += ref->data.weak;
6332	}
6333	binder_proc_unlock(proc);
6334	seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
6335
6336	count = binder_alloc_get_allocated_count(&proc->alloc);
6337	seq_printf(m, "  buffers: %d\n", count);
6338
6339	binder_alloc_print_pages(m, &proc->alloc);
6340
6341	count = 0;
6342	binder_inner_proc_lock(proc);
6343	list_for_each_entry(w, &proc->todo, entry) {
6344		if (w->type == BINDER_WORK_TRANSACTION)
6345			count++;
6346	}
6347	binder_inner_proc_unlock(proc);
6348	seq_printf(m, "  pending transactions: %d\n", count);
6349
6350	print_binder_stats(m, "  ", &proc->stats);
6351}
6352
6353static int state_show(struct seq_file *m, void *unused)
 
6354{
6355	struct binder_proc *proc;
6356	struct binder_node *node;
6357	struct binder_node *last_node = NULL;
6358
6359	seq_puts(m, "binder state:\n");
6360
6361	spin_lock(&binder_dead_nodes_lock);
6362	if (!hlist_empty(&binder_dead_nodes))
6363		seq_puts(m, "dead nodes:\n");
6364	hlist_for_each_entry(node, &binder_dead_nodes, dead_node) {
6365		/*
6366		 * take a temporary reference on the node so it
6367		 * survives and isn't removed from the list
6368		 * while we print it.
6369		 */
6370		node->tmp_refs++;
6371		spin_unlock(&binder_dead_nodes_lock);
6372		if (last_node)
6373			binder_put_node(last_node);
6374		binder_node_lock(node);
6375		print_binder_node_nilocked(m, node);
6376		binder_node_unlock(node);
6377		last_node = node;
6378		spin_lock(&binder_dead_nodes_lock);
6379	}
6380	spin_unlock(&binder_dead_nodes_lock);
6381	if (last_node)
6382		binder_put_node(last_node);
6383
6384	mutex_lock(&binder_procs_lock);
6385	hlist_for_each_entry(proc, &binder_procs, proc_node)
6386		print_binder_proc(m, proc, 1);
6387	mutex_unlock(&binder_procs_lock);
6388
6389	return 0;
6390}
6391
6392static int stats_show(struct seq_file *m, void *unused)
6393{
6394	struct binder_proc *proc;
6395
6396	seq_puts(m, "binder stats:\n");
6397
6398	print_binder_stats(m, "", &binder_stats);
6399
6400	mutex_lock(&binder_procs_lock);
6401	hlist_for_each_entry(proc, &binder_procs, proc_node)
6402		print_binder_proc_stats(m, proc);
6403	mutex_unlock(&binder_procs_lock);
6404
6405	return 0;
6406}
6407
6408static int transactions_show(struct seq_file *m, void *unused)
6409{
6410	struct binder_proc *proc;
6411
6412	seq_puts(m, "binder transactions:\n");
6413	mutex_lock(&binder_procs_lock);
6414	hlist_for_each_entry(proc, &binder_procs, proc_node)
6415		print_binder_proc(m, proc, 0);
6416	mutex_unlock(&binder_procs_lock);
6417
6418	return 0;
6419}
6420
6421static int proc_show(struct seq_file *m, void *unused)
6422{
6423	struct binder_proc *itr;
6424	int pid = (unsigned long)m->private;
6425
6426	mutex_lock(&binder_procs_lock);
6427	hlist_for_each_entry(itr, &binder_procs, proc_node) {
6428		if (itr->pid == pid) {
6429			seq_puts(m, "binder proc state:\n");
6430			print_binder_proc(m, itr, 1);
6431		}
6432	}
6433	mutex_unlock(&binder_procs_lock);
6434
6435	return 0;
6436}
6437
6438static void print_binder_transaction_log_entry(struct seq_file *m,
6439					struct binder_transaction_log_entry *e)
6440{
6441	int debug_id = READ_ONCE(e->debug_id_done);
6442	/*
6443	 * read barrier to guarantee debug_id_done read before
6444	 * we print the log values
6445	 */
6446	smp_rmb();
6447	seq_printf(m,
6448		   "%d: %s from %d:%d to %d:%d context %s node %d handle %d size %d:%d ret %d/%d l=%d",
6449		   e->debug_id, (e->call_type == 2) ? "reply" :
6450		   ((e->call_type == 1) ? "async" : "call "), e->from_proc,
6451		   e->from_thread, e->to_proc, e->to_thread, e->context_name,
6452		   e->to_node, e->target_handle, e->data_size, e->offsets_size,
6453		   e->return_error, e->return_error_param,
6454		   e->return_error_line);
6455	/*
6456	 * read-barrier to guarantee read of debug_id_done after
6457	 * done printing the fields of the entry
6458	 */
6459	smp_rmb();
6460	seq_printf(m, debug_id && debug_id == READ_ONCE(e->debug_id_done) ?
6461			"\n" : " (incomplete)\n");
6462}
6463
6464static int transaction_log_show(struct seq_file *m, void *unused)
6465{
6466	struct binder_transaction_log *log = m->private;
6467	unsigned int log_cur = atomic_read(&log->cur);
6468	unsigned int count;
6469	unsigned int cur;
6470	int i;
6471
6472	count = log_cur + 1;
6473	cur = count < ARRAY_SIZE(log->entry) && !log->full ?
6474		0 : count % ARRAY_SIZE(log->entry);
6475	if (count > ARRAY_SIZE(log->entry) || log->full)
6476		count = ARRAY_SIZE(log->entry);
6477	for (i = 0; i < count; i++) {
6478		unsigned int index = cur++ % ARRAY_SIZE(log->entry);
6479
6480		print_binder_transaction_log_entry(m, &log->entry[index]);
6481	}
6482	return 0;
6483}
6484
6485const struct file_operations binder_fops = {
6486	.owner = THIS_MODULE,
6487	.poll = binder_poll,
6488	.unlocked_ioctl = binder_ioctl,
6489	.compat_ioctl = compat_ptr_ioctl,
6490	.mmap = binder_mmap,
6491	.open = binder_open,
6492	.flush = binder_flush,
6493	.release = binder_release,
6494};
6495
6496DEFINE_SHOW_ATTRIBUTE(state);
6497DEFINE_SHOW_ATTRIBUTE(stats);
6498DEFINE_SHOW_ATTRIBUTE(transactions);
6499DEFINE_SHOW_ATTRIBUTE(transaction_log);
6500
6501const struct binder_debugfs_entry binder_debugfs_entries[] = {
6502	{
6503		.name = "state",
6504		.mode = 0444,
6505		.fops = &state_fops,
6506		.data = NULL,
6507	},
6508	{
6509		.name = "stats",
6510		.mode = 0444,
6511		.fops = &stats_fops,
6512		.data = NULL,
6513	},
6514	{
6515		.name = "transactions",
6516		.mode = 0444,
6517		.fops = &transactions_fops,
6518		.data = NULL,
6519	},
6520	{
6521		.name = "transaction_log",
6522		.mode = 0444,
6523		.fops = &transaction_log_fops,
6524		.data = &binder_transaction_log,
6525	},
6526	{
6527		.name = "failed_transaction_log",
6528		.mode = 0444,
6529		.fops = &transaction_log_fops,
6530		.data = &binder_transaction_log_failed,
6531	},
6532	{} /* terminator */
6533};
6534
6535static int __init init_binder_device(const char *name)
6536{
6537	int ret;
6538	struct binder_device *binder_device;
6539
6540	binder_device = kzalloc(sizeof(*binder_device), GFP_KERNEL);
6541	if (!binder_device)
6542		return -ENOMEM;
6543
6544	binder_device->miscdev.fops = &binder_fops;
6545	binder_device->miscdev.minor = MISC_DYNAMIC_MINOR;
6546	binder_device->miscdev.name = name;
6547
6548	refcount_set(&binder_device->ref, 1);
6549	binder_device->context.binder_context_mgr_uid = INVALID_UID;
6550	binder_device->context.name = name;
6551	mutex_init(&binder_device->context.context_mgr_node_lock);
6552
6553	ret = misc_register(&binder_device->miscdev);
6554	if (ret < 0) {
6555		kfree(binder_device);
6556		return ret;
6557	}
6558
6559	hlist_add_head(&binder_device->hlist, &binder_devices);
6560
6561	return ret;
6562}
6563
6564static int __init binder_init(void)
6565{
6566	int ret;
6567	char *device_name, *device_tmp;
6568	struct binder_device *device;
6569	struct hlist_node *tmp;
6570	char *device_names = NULL;
6571	const struct binder_debugfs_entry *db_entry;
6572
6573	ret = binder_alloc_shrinker_init();
6574	if (ret)
6575		return ret;
6576
6577	atomic_set(&binder_transaction_log.cur, ~0U);
6578	atomic_set(&binder_transaction_log_failed.cur, ~0U);
6579
6580	binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
6581
6582	binder_for_each_debugfs_entry(db_entry)
6583		debugfs_create_file(db_entry->name,
6584					db_entry->mode,
6585					binder_debugfs_dir_entry_root,
6586					db_entry->data,
6587					db_entry->fops);
6588
6589	binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
6590						binder_debugfs_dir_entry_root);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
6591
6592	if (!IS_ENABLED(CONFIG_ANDROID_BINDERFS) &&
6593	    strcmp(binder_devices_param, "") != 0) {
6594		/*
6595		* Copy the module_parameter string, because we don't want to
6596		* tokenize it in-place.
6597		 */
6598		device_names = kstrdup(binder_devices_param, GFP_KERNEL);
6599		if (!device_names) {
6600			ret = -ENOMEM;
6601			goto err_alloc_device_names_failed;
6602		}
6603
6604		device_tmp = device_names;
6605		while ((device_name = strsep(&device_tmp, ","))) {
6606			ret = init_binder_device(device_name);
6607			if (ret)
6608				goto err_init_binder_device_failed;
6609		}
6610	}
6611
6612	ret = init_binderfs();
6613	if (ret)
6614		goto err_init_binder_device_failed;
6615
6616	return ret;
6617
6618err_init_binder_device_failed:
6619	hlist_for_each_entry_safe(device, tmp, &binder_devices, hlist) {
6620		misc_deregister(&device->miscdev);
6621		hlist_del(&device->hlist);
6622		kfree(device);
6623	}
6624
6625	kfree(device_names);
6626
6627err_alloc_device_names_failed:
6628	debugfs_remove_recursive(binder_debugfs_dir_entry_root);
6629	binder_alloc_shrinker_exit();
6630
6631	return ret;
6632}
6633
6634device_initcall(binder_init);
6635
6636#define CREATE_TRACE_POINTS
6637#include "binder_trace.h"
6638
6639MODULE_LICENSE("GPL v2");