1/* binder.c
   2 *
   3 * Android IPC Subsystem
   4 *
   5 * Copyright (C) 2007-2008 Google, Inc.
   6 *
   7 * This software is licensed under the terms of the GNU General Public
   8 * License version 2, as published by the Free Software Foundation, and
   9 * may be copied, distributed, and modified under those terms.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 */
  17
  18/*
  19 * Locking overview
  20 *
  21 * There are 3 main spinlocks which must be acquired in the
  22 * order shown:
  23 *
  24 * 1) proc->outer_lock : protects binder_ref
  25 *    binder_proc_lock() and binder_proc_unlock() are
  26 *    used to acq/rel.
  27 * 2) node->lock : protects most fields of binder_node.
  28 *    binder_node_lock() and binder_node_unlock() are
  29 *    used to acq/rel
  30 * 3) proc->inner_lock : protects the thread and node lists
  31 *    (proc->threads, proc->waiting_threads, proc->nodes)
  32 *    and all todo lists associated with the binder_proc
  33 *    (proc->todo, thread->todo, proc->delivered_death and
  34 *    node->async_todo), as well as thread->transaction_stack
  35 *    binder_inner_proc_lock() and binder_inner_proc_unlock()
  36 *    are used to acq/rel
  37 *
  38 * Any lock under procA must never be nested under any lock at the same
  39 * level or below on procB.
  40 *
  41 * Functions that require a lock held on entry indicate which lock
  42 * in the suffix of the function name:
  43 *
  44 * foo_olocked() : requires node->outer_lock
  45 * foo_nlocked() : requires node->lock
  46 * foo_ilocked() : requires proc->inner_lock
  47 * foo_oilocked(): requires proc->outer_lock and proc->inner_lock
  48 * foo_nilocked(): requires node->lock and proc->inner_lock
  49 * ...
  50 */
  51
  52#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  53
  54#include <asm/cacheflush.h>
  55#include <linux/fdtable.h>
  56#include <linux/file.h>
  57#include <linux/freezer.h>
  58#include <linux/fs.h>
  59#include <linux/list.h>
  60#include <linux/miscdevice.h>
  61#include <linux/module.h>
  62#include <linux/mutex.h>
  63#include <linux/nsproxy.h>
  64#include <linux/poll.h>
  65#include <linux/debugfs.h>
  66#include <linux/rbtree.h>
  67#include <linux/sched/signal.h>
  68#include <linux/sched/mm.h>
  69#include <linux/seq_file.h>
 
  70#include <linux/uaccess.h>
  71#include <linux/pid_namespace.h>
  72#include <linux/security.h>
  73#include <linux/spinlock.h>
  74
  75#ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
  76#define BINDER_IPC_32BIT 1
  77#endif
 
  78
  79#include <uapi/linux/android/binder.h>
  80#include "binder_alloc.h"
 
 
 
  81#include "binder_trace.h"
  82
  83static HLIST_HEAD(binder_deferred_list);
  84static DEFINE_MUTEX(binder_deferred_lock);
  85
  86static HLIST_HEAD(binder_devices);
  87static HLIST_HEAD(binder_procs);
  88static DEFINE_MUTEX(binder_procs_lock);
  89
  90static HLIST_HEAD(binder_dead_nodes);
  91static DEFINE_SPINLOCK(binder_dead_nodes_lock);
  92
  93static struct dentry *binder_debugfs_dir_entry_root;
  94static struct dentry *binder_debugfs_dir_entry_proc;
  95static atomic_t binder_last_id;
  96
  97#define BINDER_DEBUG_ENTRY(name) \
  98static int binder_##name##_open(struct inode *inode, struct file *file) \
  99{ \
 100	return single_open(file, binder_##name##_show, inode->i_private); \
 101} \
 102\
 103static const struct file_operations binder_##name##_fops = { \
 104	.owner = THIS_MODULE, \
 105	.open = binder_##name##_open, \
 106	.read = seq_read, \
 107	.llseek = seq_lseek, \
 108	.release = single_release, \
 109}
 110
 111static int binder_proc_show(struct seq_file *m, void *unused);
 112BINDER_DEBUG_ENTRY(proc);
 113
 114/* This is only defined in include/asm-arm/sizes.h */
 115#ifndef SZ_1K
 116#define SZ_1K                               0x400
 117#endif
 118
 119#ifndef SZ_4M
 120#define SZ_4M                               0x400000
 121#endif
 122
 123#define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
 124
 125enum {
 126	BINDER_DEBUG_USER_ERROR             = 1U << 0,
 127	BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
 128	BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
 129	BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
 130	BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
 131	BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
 132	BINDER_DEBUG_READ_WRITE             = 1U << 6,
 133	BINDER_DEBUG_USER_REFS              = 1U << 7,
 134	BINDER_DEBUG_THREADS                = 1U << 8,
 135	BINDER_DEBUG_TRANSACTION            = 1U << 9,
 136	BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
 137	BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
 138	BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
 139	BINDER_DEBUG_PRIORITY_CAP           = 1U << 13,
 140	BINDER_DEBUG_SPINLOCKS              = 1U << 14,
 141};
 142static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 143	BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 144module_param_named(debug_mask, binder_debug_mask, uint, 0644);
 145
 146static char *binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES;
 147module_param_named(devices, binder_devices_param, charp, 0444);
 148
 149static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 150static int binder_stop_on_user_error;
 151
 152static int binder_set_stop_on_user_error(const char *val,
 153					 const struct kernel_param *kp)
 154{
 155	int ret;
 156
 157	ret = param_set_int(val, kp);
 158	if (binder_stop_on_user_error < 2)
 159		wake_up(&binder_user_error_wait);
 160	return ret;
 161}
 162module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 163	param_get_int, &binder_stop_on_user_error, 0644);
 164
 165#define binder_debug(mask, x...) \
 166	do { \
 167		if (binder_debug_mask & mask) \
 168			pr_info(x); \
 169	} while (0)
 
 
 
 
 
 
 
 
 
 
 
 170
 171#define binder_user_error(x...) \
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 172	do { \
 173		if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 174			pr_info(x); \
 175		if (binder_stop_on_user_error) \
 176			binder_stop_on_user_error = 2; \
 177	} while (0)
 178
 179#define to_flat_binder_object(hdr) \
 180	container_of(hdr, struct flat_binder_object, hdr)
 181
 182#define to_binder_fd_object(hdr) container_of(hdr, struct binder_fd_object, hdr)
 183
 184#define to_binder_buffer_object(hdr) \
 185	container_of(hdr, struct binder_buffer_object, hdr)
 186
 187#define to_binder_fd_array_object(hdr) \
 188	container_of(hdr, struct binder_fd_array_object, hdr)
 189
 190enum binder_stat_types {
 191	BINDER_STAT_PROC,
 192	BINDER_STAT_THREAD,
 193	BINDER_STAT_NODE,
 194	BINDER_STAT_REF,
 195	BINDER_STAT_DEATH,
 196	BINDER_STAT_TRANSACTION,
 197	BINDER_STAT_TRANSACTION_COMPLETE,
 198	BINDER_STAT_COUNT
 199};
 200
 201struct binder_stats {
 202	atomic_t br[_IOC_NR(BR_FAILED_REPLY) + 1];
 203	atomic_t bc[_IOC_NR(BC_REPLY_SG) + 1];
 204	atomic_t obj_created[BINDER_STAT_COUNT];
 205	atomic_t obj_deleted[BINDER_STAT_COUNT];
 206};
 207
 208static struct binder_stats binder_stats;
 209
 210static inline void binder_stats_deleted(enum binder_stat_types type)
 211{
 212	atomic_inc(&binder_stats.obj_deleted[type]);
 213}
 214
 215static inline void binder_stats_created(enum binder_stat_types type)
 216{
 217	atomic_inc(&binder_stats.obj_created[type]);
 218}
 219
 220struct binder_transaction_log_entry {
 221	int debug_id;
 222	int debug_id_done;
 223	int call_type;
 224	int from_proc;
 225	int from_thread;
 226	int target_handle;
 227	int to_proc;
 228	int to_thread;
 229	int to_node;
 230	int data_size;
 231	int offsets_size;
 232	int return_error_line;
 233	uint32_t return_error;
 234	uint32_t return_error_param;
 235	const char *context_name;
 236};
 
 237struct binder_transaction_log {
 238	atomic_t cur;
 239	bool full;
 240	struct binder_transaction_log_entry entry[32];
 241};
 
 242static struct binder_transaction_log binder_transaction_log;
 243static struct binder_transaction_log binder_transaction_log_failed;
 244
 245static struct binder_transaction_log_entry *binder_transaction_log_add(
 246	struct binder_transaction_log *log)
 247{
 248	struct binder_transaction_log_entry *e;
 249	unsigned int cur = atomic_inc_return(&log->cur);
 250
 251	if (cur >= ARRAY_SIZE(log->entry))
 252		log->full = true;
 253	e = &log->entry[cur % ARRAY_SIZE(log->entry)];
 254	WRITE_ONCE(e->debug_id_done, 0);
 255	/*
 256	 * write-barrier to synchronize access to e->debug_id_done.
 257	 * We make sure the initialized 0 value is seen before
 258	 * memset() other fields are zeroed by memset.
 259	 */
 260	smp_wmb();
 261	memset(e, 0, sizeof(*e));
 262	return e;
 263}
 264
 265struct binder_context {
 266	struct binder_node *binder_context_mgr_node;
 267	struct mutex context_mgr_node_lock;
 268
 269	kuid_t binder_context_mgr_uid;
 270	const char *name;
 271};
 272
 273struct binder_device {
 274	struct hlist_node hlist;
 275	struct miscdevice miscdev;
 276	struct binder_context context;
 277};
 278
 279/**
 280 * struct binder_work - work enqueued on a worklist
 281 * @entry:             node enqueued on list
 282 * @type:              type of work to be performed
 283 *
 284 * There are separate work lists for proc, thread, and node (async).
 285 */
 286struct binder_work {
 287	struct list_head entry;
 288
 289	enum {
 290		BINDER_WORK_TRANSACTION = 1,
 291		BINDER_WORK_TRANSACTION_COMPLETE,
 292		BINDER_WORK_RETURN_ERROR,
 293		BINDER_WORK_NODE,
 294		BINDER_WORK_DEAD_BINDER,
 295		BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 296		BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 297	} type;
 298};
 299
 300struct binder_error {
 301	struct binder_work work;
 302	uint32_t cmd;
 303};
 304
 305/**
 306 * struct binder_node - binder node bookkeeping
 307 * @debug_id:             unique ID for debugging
 308 *                        (invariant after initialized)
 309 * @lock:                 lock for node fields
 310 * @work:                 worklist element for node work
 311 *                        (protected by @proc->inner_lock)
 312 * @rb_node:              element for proc->nodes tree
 313 *                        (protected by @proc->inner_lock)
 314 * @dead_node:            element for binder_dead_nodes list
 315 *                        (protected by binder_dead_nodes_lock)
 316 * @proc:                 binder_proc that owns this node
 317 *                        (invariant after initialized)
 318 * @refs:                 list of references on this node
 319 *                        (protected by @lock)
 320 * @internal_strong_refs: used to take strong references when
 321 *                        initiating a transaction
 322 *                        (protected by @proc->inner_lock if @proc
 323 *                        and by @lock)
 324 * @local_weak_refs:      weak user refs from local process
 325 *                        (protected by @proc->inner_lock if @proc
 326 *                        and by @lock)
 327 * @local_strong_refs:    strong user refs from local process
 328 *                        (protected by @proc->inner_lock if @proc
 329 *                        and by @lock)
 330 * @tmp_refs:             temporary kernel refs
 331 *                        (protected by @proc->inner_lock while @proc
 332 *                        is valid, and by binder_dead_nodes_lock
 333 *                        if @proc is NULL. During inc/dec and node release
 334 *                        it is also protected by @lock to provide safety
 335 *                        as the node dies and @proc becomes NULL)
 336 * @ptr:                  userspace pointer for node
 337 *                        (invariant, no lock needed)
 338 * @cookie:               userspace cookie for node
 339 *                        (invariant, no lock needed)
 340 * @has_strong_ref:       userspace notified of strong ref
 341 *                        (protected by @proc->inner_lock if @proc
 342 *                        and by @lock)
 343 * @pending_strong_ref:   userspace has acked notification of strong ref
 344 *                        (protected by @proc->inner_lock if @proc
 345 *                        and by @lock)
 346 * @has_weak_ref:         userspace notified of weak ref
 347 *                        (protected by @proc->inner_lock if @proc
 348 *                        and by @lock)
 349 * @pending_weak_ref:     userspace has acked notification of weak ref
 350 *                        (protected by @proc->inner_lock if @proc
 351 *                        and by @lock)
 352 * @has_async_transaction: async transaction to node in progress
 353 *                        (protected by @lock)
 354 * @accept_fds:           file descriptor operations supported for node
 355 *                        (invariant after initialized)
 356 * @min_priority:         minimum scheduling priority
 357 *                        (invariant after initialized)
 358 * @async_todo:           list of async work items
 359 *                        (protected by @proc->inner_lock)
 360 *
 361 * Bookkeeping structure for binder nodes.
 362 */
 363struct binder_node {
 364	int debug_id;
 365	spinlock_t lock;
 366	struct binder_work work;
 367	union {
 368		struct rb_node rb_node;
 369		struct hlist_node dead_node;
 370	};
 371	struct binder_proc *proc;
 372	struct hlist_head refs;
 373	int internal_strong_refs;
 374	int local_weak_refs;
 375	int local_strong_refs;
 376	int tmp_refs;
 377	binder_uintptr_t ptr;
 378	binder_uintptr_t cookie;
 379	struct {
 380		/*
 381		 * bitfield elements protected by
 382		 * proc inner_lock
 383		 */
 384		u8 has_strong_ref:1;
 385		u8 pending_strong_ref:1;
 386		u8 has_weak_ref:1;
 387		u8 pending_weak_ref:1;
 388	};
 389	struct {
 390		/*
 391		 * invariant after initialization
 392		 */
 393		u8 accept_fds:1;
 394		u8 min_priority;
 395	};
 396	bool has_async_transaction;
 397	struct list_head async_todo;
 398};
 399
 400struct binder_ref_death {
 401	/**
 402	 * @work: worklist element for death notifications
 403	 *        (protected by inner_lock of the proc that
 404	 *        this ref belongs to)
 405	 */
 406	struct binder_work work;
 407	binder_uintptr_t cookie;
 408};
 409
 410/**
 411 * struct binder_ref_data - binder_ref counts and id
 412 * @debug_id:        unique ID for the ref
 413 * @desc:            unique userspace handle for ref
 414 * @strong:          strong ref count (debugging only if not locked)
 415 * @weak:            weak ref count (debugging only if not locked)
 416 *
 417 * Structure to hold ref count and ref id information. Since
 418 * the actual ref can only be accessed with a lock, this structure
 419 * is used to return information about the ref to callers of
 420 * ref inc/dec functions.
 421 */
 422struct binder_ref_data {
 423	int debug_id;
 424	uint32_t desc;
 425	int strong;
 426	int weak;
 427};
 428
 429/**
 430 * struct binder_ref - struct to track references on nodes
 431 * @data:        binder_ref_data containing id, handle, and current refcounts
 432 * @rb_node_desc: node for lookup by @data.desc in proc's rb_tree
 433 * @rb_node_node: node for lookup by @node in proc's rb_tree
 434 * @node_entry:  list entry for node->refs list in target node
 435 *               (protected by @node->lock)
 436 * @proc:        binder_proc containing ref
 437 * @node:        binder_node of target node. When cleaning up a
 438 *               ref for deletion in binder_cleanup_ref, a non-NULL
 439 *               @node indicates the node must be freed
 440 * @death:       pointer to death notification (ref_death) if requested
 441 *               (protected by @node->lock)
 442 *
 443 * Structure to track references from procA to target node (on procB). This
 444 * structure is unsafe to access without holding @proc->outer_lock.
 445 */
 446struct binder_ref {
 447	/* Lookups needed: */
 448	/*   node + proc => ref (transaction) */
 449	/*   desc + proc => ref (transaction, inc/dec ref) */
 450	/*   node => refs + procs (proc exit) */
 451	struct binder_ref_data data;
 452	struct rb_node rb_node_desc;
 453	struct rb_node rb_node_node;
 454	struct hlist_node node_entry;
 455	struct binder_proc *proc;
 456	struct binder_node *node;
 457	struct binder_ref_death *death;
 458};
 459
 460enum binder_deferred_state {
 461	BINDER_DEFERRED_PUT_FILES    = 0x01,
 462	BINDER_DEFERRED_FLUSH        = 0x02,
 463	BINDER_DEFERRED_RELEASE      = 0x04,
 464};
 465
 466/**
 467 * struct binder_proc - binder process bookkeeping
 468 * @proc_node:            element for binder_procs list
 469 * @threads:              rbtree of binder_threads in this proc
 470 *                        (protected by @inner_lock)
 471 * @nodes:                rbtree of binder nodes associated with
 472 *                        this proc ordered by node->ptr
 473 *                        (protected by @inner_lock)
 474 * @refs_by_desc:         rbtree of refs ordered by ref->desc
 475 *                        (protected by @outer_lock)
 476 * @refs_by_node:         rbtree of refs ordered by ref->node
 477 *                        (protected by @outer_lock)
 478 * @waiting_threads:      threads currently waiting for proc work
 479 *                        (protected by @inner_lock)
 480 * @pid                   PID of group_leader of process
 481 *                        (invariant after initialized)
 482 * @tsk                   task_struct for group_leader of process
 483 *                        (invariant after initialized)
 484 * @files                 files_struct for process
 485 *                        (protected by @files_lock)
 486 * @files_lock            mutex to protect @files
 487 * @deferred_work_node:   element for binder_deferred_list
 488 *                        (protected by binder_deferred_lock)
 489 * @deferred_work:        bitmap of deferred work to perform
 490 *                        (protected by binder_deferred_lock)
 491 * @is_dead:              process is dead and awaiting free
 492 *                        when outstanding transactions are cleaned up
 493 *                        (protected by @inner_lock)
 494 * @todo:                 list of work for this process
 495 *                        (protected by @inner_lock)
 496 * @stats:                per-process binder statistics
 497 *                        (atomics, no lock needed)
 498 * @delivered_death:      list of delivered death notification
 499 *                        (protected by @inner_lock)
 500 * @max_threads:          cap on number of binder threads
 501 *                        (protected by @inner_lock)
 502 * @requested_threads:    number of binder threads requested but not
 503 *                        yet started. In current implementation, can
 504 *                        only be 0 or 1.
 505 *                        (protected by @inner_lock)
 506 * @requested_threads_started: number binder threads started
 507 *                        (protected by @inner_lock)
 508 * @tmp_ref:              temporary reference to indicate proc is in use
 509 *                        (protected by @inner_lock)
 510 * @default_priority:     default scheduler priority
 511 *                        (invariant after initialized)
 512 * @debugfs_entry:        debugfs node
 513 * @alloc:                binder allocator bookkeeping
 514 * @context:              binder_context for this proc
 515 *                        (invariant after initialized)
 516 * @inner_lock:           can nest under outer_lock and/or node lock
 517 * @outer_lock:           no nesting under innor or node lock
 518 *                        Lock order: 1) outer, 2) node, 3) inner
 519 *
 520 * Bookkeeping structure for binder processes
 521 */
 522struct binder_proc {
 523	struct hlist_node proc_node;
 524	struct rb_root threads;
 525	struct rb_root nodes;
 526	struct rb_root refs_by_desc;
 527	struct rb_root refs_by_node;
 528	struct list_head waiting_threads;
 529	int pid;
 530	struct task_struct *tsk;
 531	struct files_struct *files;
 532	struct mutex files_lock;
 533	struct hlist_node deferred_work_node;
 534	int deferred_work;
 535	bool is_dead;
 536
 537	struct list_head todo;
 538	struct binder_stats stats;
 539	struct list_head delivered_death;
 540	int max_threads;
 541	int requested_threads;
 542	int requested_threads_started;
 543	int tmp_ref;
 544	long default_priority;
 545	struct dentry *debugfs_entry;
 546	struct binder_alloc alloc;
 547	struct binder_context *context;
 548	spinlock_t inner_lock;
 549	spinlock_t outer_lock;
 550};
 551
 552enum {
 553	BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 554	BINDER_LOOPER_STATE_ENTERED     = 0x02,
 555	BINDER_LOOPER_STATE_EXITED      = 0x04,
 556	BINDER_LOOPER_STATE_INVALID     = 0x08,
 557	BINDER_LOOPER_STATE_WAITING     = 0x10,
 558	BINDER_LOOPER_STATE_POLL        = 0x20,
 559};
 560
 561/**
 562 * struct binder_thread - binder thread bookkeeping
 563 * @proc:                 binder process for this thread
 564 *                        (invariant after initialization)
 565 * @rb_node:              element for proc->threads rbtree
 566 *                        (protected by @proc->inner_lock)
 567 * @waiting_thread_node:  element for @proc->waiting_threads list
 568 *                        (protected by @proc->inner_lock)
 569 * @pid:                  PID for this thread
 570 *                        (invariant after initialization)
 571 * @looper:               bitmap of looping state
 572 *                        (only accessed by this thread)
 573 * @looper_needs_return:  looping thread needs to exit driver
 574 *                        (no lock needed)
 575 * @transaction_stack:    stack of in-progress transactions for this thread
 576 *                        (protected by @proc->inner_lock)
 577 * @todo:                 list of work to do for this thread
 578 *                        (protected by @proc->inner_lock)
 579 * @process_todo:         whether work in @todo should be processed
 580 *                        (protected by @proc->inner_lock)
 581 * @return_error:         transaction errors reported by this thread
 582 *                        (only accessed by this thread)
 583 * @reply_error:          transaction errors reported by target thread
 584 *                        (protected by @proc->inner_lock)
 585 * @wait:                 wait queue for thread work
 586 * @stats:                per-thread statistics
 587 *                        (atomics, no lock needed)
 588 * @tmp_ref:              temporary reference to indicate thread is in use
 589 *                        (atomic since @proc->inner_lock cannot
 590 *                        always be acquired)
 591 * @is_dead:              thread is dead and awaiting free
 592 *                        when outstanding transactions are cleaned up
 593 *                        (protected by @proc->inner_lock)
 594 *
 595 * Bookkeeping structure for binder threads.
 596 */
 597struct binder_thread {
 598	struct binder_proc *proc;
 599	struct rb_node rb_node;
 600	struct list_head waiting_thread_node;
 601	int pid;
 602	int looper;              /* only modified by this thread */
 603	bool looper_need_return; /* can be written by other thread */
 604	struct binder_transaction *transaction_stack;
 605	struct list_head todo;
 606	bool process_todo;
 607	struct binder_error return_error;
 608	struct binder_error reply_error;
 609	wait_queue_head_t wait;
 610	struct binder_stats stats;
 611	atomic_t tmp_ref;
 612	bool is_dead;
 613};
 614
 615struct binder_transaction {
 616	int debug_id;
 617	struct binder_work work;
 618	struct binder_thread *from;
 619	struct binder_transaction *from_parent;
 620	struct binder_proc *to_proc;
 621	struct binder_thread *to_thread;
 622	struct binder_transaction *to_parent;
 623	unsigned need_reply:1;
 624	/* unsigned is_dead:1; */	/* not used at the moment */
 625
 626	struct binder_buffer *buffer;
 627	unsigned int	code;
 628	unsigned int	flags;
 629	long	priority;
 630	long	saved_priority;
 631	kuid_t	sender_euid;
 632	/**
 633	 * @lock:  protects @from, @to_proc, and @to_thread
 634	 *
 635	 * @from, @to_proc, and @to_thread can be set to NULL
 636	 * during thread teardown
 637	 */
 638	spinlock_t lock;
 639};
 640
 641/**
 642 * binder_proc_lock() - Acquire outer lock for given binder_proc
 643 * @proc:         struct binder_proc to acquire
 644 *
 645 * Acquires proc->outer_lock. Used to protect binder_ref
 646 * structures associated with the given proc.
 647 */
 648#define binder_proc_lock(proc) _binder_proc_lock(proc, __LINE__)
 649static void
 650_binder_proc_lock(struct binder_proc *proc, int line)
 
 651{
 652	binder_debug(BINDER_DEBUG_SPINLOCKS,
 653		     "%s: line=%d\n", __func__, line);
 654	spin_lock(&proc->outer_lock);
 655}
 656
 657/**
 658 * binder_proc_unlock() - Release spinlock for given binder_proc
 659 * @proc:         struct binder_proc to acquire
 660 *
 661 * Release lock acquired via binder_proc_lock()
 662 */
 663#define binder_proc_unlock(_proc) _binder_proc_unlock(_proc, __LINE__)
 664static void
 665_binder_proc_unlock(struct binder_proc *proc, int line)
 
 666{
 667	binder_debug(BINDER_DEBUG_SPINLOCKS,
 668		     "%s: line=%d\n", __func__, line);
 669	spin_unlock(&proc->outer_lock);
 670}
 671
 672/**
 673 * binder_inner_proc_lock() - Acquire inner lock for given binder_proc
 674 * @proc:         struct binder_proc to acquire
 675 *
 676 * Acquires proc->inner_lock. Used to protect todo lists
 677 */
 678#define binder_inner_proc_lock(proc) _binder_inner_proc_lock(proc, __LINE__)
 679static void
 680_binder_inner_proc_lock(struct binder_proc *proc, int line)
 
 681{
 682	binder_debug(BINDER_DEBUG_SPINLOCKS,
 683		     "%s: line=%d\n", __func__, line);
 684	spin_lock(&proc->inner_lock);
 685}
 686
 687/**
 688 * binder_inner_proc_unlock() - Release inner lock for given binder_proc
 689 * @proc:         struct binder_proc to acquire
 690 *
 691 * Release lock acquired via binder_inner_proc_lock()
 692 */
 693#define binder_inner_proc_unlock(proc) _binder_inner_proc_unlock(proc, __LINE__)
 694static void
 695_binder_inner_proc_unlock(struct binder_proc *proc, int line)
 
 696{
 697	binder_debug(BINDER_DEBUG_SPINLOCKS,
 698		     "%s: line=%d\n", __func__, line);
 699	spin_unlock(&proc->inner_lock);
 700}
 701
 702/**
 703 * binder_node_lock() - Acquire spinlock for given binder_node
 704 * @node:         struct binder_node to acquire
 705 *
 706 * Acquires node->lock. Used to protect binder_node fields
 707 */
 708#define binder_node_lock(node) _binder_node_lock(node, __LINE__)
 709static void
 710_binder_node_lock(struct binder_node *node, int line)
 
 711{
 712	binder_debug(BINDER_DEBUG_SPINLOCKS,
 713		     "%s: line=%d\n", __func__, line);
 714	spin_lock(&node->lock);
 715}
 716
 717/**
 718 * binder_node_unlock() - Release spinlock for given binder_proc
 719 * @node:         struct binder_node to acquire
 720 *
 721 * Release lock acquired via binder_node_lock()
 722 */
 723#define binder_node_unlock(node) _binder_node_unlock(node, __LINE__)
 724static void
 725_binder_node_unlock(struct binder_node *node, int line)
 
 726{
 727	binder_debug(BINDER_DEBUG_SPINLOCKS,
 728		     "%s: line=%d\n", __func__, line);
 729	spin_unlock(&node->lock);
 730}
 731
 732/**
 733 * binder_node_inner_lock() - Acquire node and inner locks
 734 * @node:         struct binder_node to acquire
 735 *
 736 * Acquires node->lock. If node->proc also acquires
 737 * proc->inner_lock. Used to protect binder_node fields
 738 */
 739#define binder_node_inner_lock(node) _binder_node_inner_lock(node, __LINE__)
 740static void
 741_binder_node_inner_lock(struct binder_node *node, int line)
 
 742{
 743	binder_debug(BINDER_DEBUG_SPINLOCKS,
 744		     "%s: line=%d\n", __func__, line);
 745	spin_lock(&node->lock);
 746	if (node->proc)
 747		binder_inner_proc_lock(node->proc);
 
 
 
 748}
 749
 750/**
 751 * binder_node_unlock() - Release node and inner locks
 752 * @node:         struct binder_node to acquire
 753 *
 754 * Release lock acquired via binder_node_lock()
 755 */
 756#define binder_node_inner_unlock(node) _binder_node_inner_unlock(node, __LINE__)
 757static void
 758_binder_node_inner_unlock(struct binder_node *node, int line)
 
 759{
 760	struct binder_proc *proc = node->proc;
 761
 762	binder_debug(BINDER_DEBUG_SPINLOCKS,
 763		     "%s: line=%d\n", __func__, line);
 764	if (proc)
 765		binder_inner_proc_unlock(proc);
 
 
 
 766	spin_unlock(&node->lock);
 767}
 768
 769static bool binder_worklist_empty_ilocked(struct list_head *list)
 770{
 771	return list_empty(list);
 772}
 773
 774/**
 775 * binder_worklist_empty() - Check if no items on the work list
 776 * @proc:       binder_proc associated with list
 777 * @list:	list to check
 778 *
 779 * Return: true if there are no items on list, else false
 780 */
 781static bool binder_worklist_empty(struct binder_proc *proc,
 782				  struct list_head *list)
 783{
 784	bool ret;
 785
 786	binder_inner_proc_lock(proc);
 787	ret = binder_worklist_empty_ilocked(list);
 788	binder_inner_proc_unlock(proc);
 789	return ret;
 790}
 791
 792/**
 793 * binder_enqueue_work_ilocked() - Add an item to the work list
 794 * @work:         struct binder_work to add to list
 795 * @target_list:  list to add work to
 796 *
 797 * Adds the work to the specified list. Asserts that work
 798 * is not already on a list.
 799 *
 800 * Requires the proc->inner_lock to be held.
 801 */
 802static void
 803binder_enqueue_work_ilocked(struct binder_work *work,
 804			   struct list_head *target_list)
 805{
 806	BUG_ON(target_list == NULL);
 807	BUG_ON(work->entry.next && !list_empty(&work->entry));
 808	list_add_tail(&work->entry, target_list);
 809}
 810
 811/**
 812 * binder_enqueue_deferred_thread_work_ilocked() - Add deferred thread work
 813 * @thread:       thread to queue work to
 814 * @work:         struct binder_work to add to list
 815 *
 816 * Adds the work to the todo list of the thread. Doesn't set the process_todo
 817 * flag, which means that (if it wasn't already set) the thread will go to
 818 * sleep without handling this work when it calls read.
 819 *
 820 * Requires the proc->inner_lock to be held.
 821 */
 822static void
 823binder_enqueue_deferred_thread_work_ilocked(struct binder_thread *thread,
 824					    struct binder_work *work)
 825{
 
 826	binder_enqueue_work_ilocked(work, &thread->todo);
 827}
 828
 829/**
 830 * binder_enqueue_thread_work_ilocked() - Add an item to the thread work list
 831 * @thread:       thread to queue work to
 832 * @work:         struct binder_work to add to list
 833 *
 834 * Adds the work to the todo list of the thread, and enables processing
 835 * of the todo queue.
 836 *
 837 * Requires the proc->inner_lock to be held.
 838 */
 839static void
 840binder_enqueue_thread_work_ilocked(struct binder_thread *thread,
 841				   struct binder_work *work)
 842{
 
 843	binder_enqueue_work_ilocked(work, &thread->todo);
 
 
 
 
 
 
 
 
 
 
 844	thread->process_todo = true;
 845}
 846
 847/**
 848 * binder_enqueue_thread_work() - Add an item to the thread work list
 849 * @thread:       thread to queue work to
 850 * @work:         struct binder_work to add to list
 851 *
 852 * Adds the work to the todo list of the thread, and enables processing
 853 * of the todo queue.
 854 */
 855static void
 856binder_enqueue_thread_work(struct binder_thread *thread,
 857			   struct binder_work *work)
 858{
 859	binder_inner_proc_lock(thread->proc);
 860	binder_enqueue_thread_work_ilocked(thread, work);
 861	binder_inner_proc_unlock(thread->proc);
 862}
 863
 864static void
 865binder_dequeue_work_ilocked(struct binder_work *work)
 866{
 867	list_del_init(&work->entry);
 868}
 869
 870/**
 871 * binder_dequeue_work() - Removes an item from the work list
 872 * @proc:         binder_proc associated with list
 873 * @work:         struct binder_work to remove from list
 874 *
 875 * Removes the specified work item from whatever list it is on.
 876 * Can safely be called if work is not on any list.
 877 */
 878static void
 879binder_dequeue_work(struct binder_proc *proc, struct binder_work *work)
 880{
 881	binder_inner_proc_lock(proc);
 882	binder_dequeue_work_ilocked(work);
 883	binder_inner_proc_unlock(proc);
 884}
 885
 886static struct binder_work *binder_dequeue_work_head_ilocked(
 887					struct list_head *list)
 888{
 889	struct binder_work *w;
 890
 891	w = list_first_entry_or_null(list, struct binder_work, entry);
 892	if (w)
 893		list_del_init(&w->entry);
 894	return w;
 895}
 896
 897/**
 898 * binder_dequeue_work_head() - Dequeues the item at head of list
 899 * @proc:         binder_proc associated with list
 900 * @list:         list to dequeue head
 901 *
 902 * Removes the head of the list if there are items on the list
 903 *
 904 * Return: pointer dequeued binder_work, NULL if list was empty
 905 */
 906static struct binder_work *binder_dequeue_work_head(
 907					struct binder_proc *proc,
 908					struct list_head *list)
 909{
 910	struct binder_work *w;
 911
 912	binder_inner_proc_lock(proc);
 913	w = binder_dequeue_work_head_ilocked(list);
 914	binder_inner_proc_unlock(proc);
 915	return w;
 916}
 917
 918static void
 919binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 920static void binder_free_thread(struct binder_thread *thread);
 921static void binder_free_proc(struct binder_proc *proc);
 922static void binder_inc_node_tmpref_ilocked(struct binder_node *node);
 923
 924static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 925{
 926	unsigned long rlim_cur;
 927	unsigned long irqs;
 928	int ret;
 929
 930	mutex_lock(&proc->files_lock);
 931	if (proc->files == NULL) {
 932		ret = -ESRCH;
 933		goto err;
 934	}
 935	if (!lock_task_sighand(proc->tsk, &irqs)) {
 936		ret = -EMFILE;
 937		goto err;
 938	}
 939	rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 940	unlock_task_sighand(proc->tsk, &irqs);
 941
 942	ret = __alloc_fd(proc->files, 0, rlim_cur, flags);
 943err:
 944	mutex_unlock(&proc->files_lock);
 945	return ret;
 946}
 947
 948/*
 949 * copied from fd_install
 950 */
 951static void task_fd_install(
 952	struct binder_proc *proc, unsigned int fd, struct file *file)
 953{
 954	mutex_lock(&proc->files_lock);
 955	if (proc->files)
 956		__fd_install(proc->files, fd, file);
 957	mutex_unlock(&proc->files_lock);
 958}
 959
 960/*
 961 * copied from sys_close
 962 */
 963static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 964{
 965	int retval;
 966
 967	mutex_lock(&proc->files_lock);
 968	if (proc->files == NULL) {
 969		retval = -ESRCH;
 970		goto err;
 971	}
 972	retval = __close_fd(proc->files, fd);
 973	/* can't restart close syscall because file table entry was cleared */
 974	if (unlikely(retval == -ERESTARTSYS ||
 975		     retval == -ERESTARTNOINTR ||
 976		     retval == -ERESTARTNOHAND ||
 977		     retval == -ERESTART_RESTARTBLOCK))
 978		retval = -EINTR;
 979err:
 980	mutex_unlock(&proc->files_lock);
 981	return retval;
 982}
 983
 984static bool binder_has_work_ilocked(struct binder_thread *thread,
 985				    bool do_proc_work)
 986{
 987	return thread->process_todo ||
 988		thread->looper_need_return ||
 989		(do_proc_work &&
 990		 !binder_worklist_empty_ilocked(&thread->proc->todo));
 991}
 992
 993static bool binder_has_work(struct binder_thread *thread, bool do_proc_work)
 994{
 995	bool has_work;
 996
 997	binder_inner_proc_lock(thread->proc);
 998	has_work = binder_has_work_ilocked(thread, do_proc_work);
 999	binder_inner_proc_unlock(thread->proc);
1000
1001	return has_work;
1002}
1003
1004static bool binder_available_for_proc_work_ilocked(struct binder_thread *thread)
1005{
1006	return !thread->transaction_stack &&
1007		binder_worklist_empty_ilocked(&thread->todo) &&
1008		(thread->looper & (BINDER_LOOPER_STATE_ENTERED |
1009				   BINDER_LOOPER_STATE_REGISTERED));
1010}
1011
1012static void binder_wakeup_poll_threads_ilocked(struct binder_proc *proc,
1013					       bool sync)
1014{
1015	struct rb_node *n;
1016	struct binder_thread *thread;
1017
1018	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
1019		thread = rb_entry(n, struct binder_thread, rb_node);
1020		if (thread->looper & BINDER_LOOPER_STATE_POLL &&
1021		    binder_available_for_proc_work_ilocked(thread)) {
1022			if (sync)
1023				wake_up_interruptible_sync(&thread->wait);
1024			else
1025				wake_up_interruptible(&thread->wait);
1026		}
1027	}
1028}
1029
1030/**
1031 * binder_select_thread_ilocked() - selects a thread for doing proc work.
1032 * @proc:	process to select a thread from
1033 *
1034 * Note that calling this function moves the thread off the waiting_threads
1035 * list, so it can only be woken up by the caller of this function, or a
1036 * signal. Therefore, callers *should* always wake up the thread this function
1037 * returns.
1038 *
1039 * Return:	If there's a thread currently waiting for process work,
1040 *		returns that thread. Otherwise returns NULL.
1041 */
1042static struct binder_thread *
1043binder_select_thread_ilocked(struct binder_proc *proc)
1044{
1045	struct binder_thread *thread;
1046
1047	assert_spin_locked(&proc->inner_lock);
1048	thread = list_first_entry_or_null(&proc->waiting_threads,
1049					  struct binder_thread,
1050					  waiting_thread_node);
1051
1052	if (thread)
1053		list_del_init(&thread->waiting_thread_node);
1054
1055	return thread;
1056}
1057
1058/**
1059 * binder_wakeup_thread_ilocked() - wakes up a thread for doing proc work.
1060 * @proc:	process to wake up a thread in
1061 * @thread:	specific thread to wake-up (may be NULL)
1062 * @sync:	whether to do a synchronous wake-up
1063 *
1064 * This function wakes up a thread in the @proc process.
1065 * The caller may provide a specific thread to wake-up in
1066 * the @thread parameter. If @thread is NULL, this function
1067 * will wake up threads that have called poll().
1068 *
1069 * Note that for this function to work as expected, callers
1070 * should first call binder_select_thread() to find a thread
1071 * to handle the work (if they don't have a thread already),
1072 * and pass the result into the @thread parameter.
1073 */
1074static void binder_wakeup_thread_ilocked(struct binder_proc *proc,
1075					 struct binder_thread *thread,
1076					 bool sync)
1077{
1078	assert_spin_locked(&proc->inner_lock);
1079
1080	if (thread) {
1081		if (sync)
1082			wake_up_interruptible_sync(&thread->wait);
1083		else
1084			wake_up_interruptible(&thread->wait);
1085		return;
1086	}
1087
1088	/* Didn't find a thread waiting for proc work; this can happen
1089	 * in two scenarios:
1090	 * 1. All threads are busy handling transactions
1091	 *    In that case, one of those threads should call back into
1092	 *    the kernel driver soon and pick up this work.
1093	 * 2. Threads are using the (e)poll interface, in which case
1094	 *    they may be blocked on the waitqueue without having been
1095	 *    added to waiting_threads. For this case, we just iterate
1096	 *    over all threads not handling transaction work, and
1097	 *    wake them all up. We wake all because we don't know whether
1098	 *    a thread that called into (e)poll is handling non-binder
1099	 *    work currently.
1100	 */
1101	binder_wakeup_poll_threads_ilocked(proc, sync);
1102}
1103
1104static void binder_wakeup_proc_ilocked(struct binder_proc *proc)
1105{
1106	struct binder_thread *thread = binder_select_thread_ilocked(proc);
1107
1108	binder_wakeup_thread_ilocked(proc, thread, /* sync = */false);
1109}
1110
1111static void binder_set_nice(long nice)
1112{
1113	long min_nice;
1114
1115	if (can_nice(current, nice)) {
1116		set_user_nice(current, nice);
1117		return;
1118	}
1119	min_nice = rlimit_to_nice(rlimit(RLIMIT_NICE));
1120	binder_debug(BINDER_DEBUG_PRIORITY_CAP,
1121		     "%d: nice value %ld not allowed use %ld instead\n",
1122		      current->pid, nice, min_nice);
1123	set_user_nice(current, min_nice);
1124	if (min_nice <= MAX_NICE)
1125		return;
1126	binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
1127}
1128
1129static struct binder_node *binder_get_node_ilocked(struct binder_proc *proc,
1130						   binder_uintptr_t ptr)
1131{
1132	struct rb_node *n = proc->nodes.rb_node;
1133	struct binder_node *node;
1134
1135	assert_spin_locked(&proc->inner_lock);
1136
1137	while (n) {
1138		node = rb_entry(n, struct binder_node, rb_node);
1139
1140		if (ptr < node->ptr)
1141			n = n->rb_left;
1142		else if (ptr > node->ptr)
1143			n = n->rb_right;
1144		else {
1145			/*
1146			 * take an implicit weak reference
1147			 * to ensure node stays alive until
1148			 * call to binder_put_node()
1149			 */
1150			binder_inc_node_tmpref_ilocked(node);
1151			return node;
1152		}
1153	}
1154	return NULL;
1155}
1156
1157static struct binder_node *binder_get_node(struct binder_proc *proc,
1158					   binder_uintptr_t ptr)
1159{
1160	struct binder_node *node;
1161
1162	binder_inner_proc_lock(proc);
1163	node = binder_get_node_ilocked(proc, ptr);
1164	binder_inner_proc_unlock(proc);
1165	return node;
1166}
1167
1168static struct binder_node *binder_init_node_ilocked(
1169						struct binder_proc *proc,
1170						struct binder_node *new_node,
1171						struct flat_binder_object *fp)
1172{
1173	struct rb_node **p = &proc->nodes.rb_node;
1174	struct rb_node *parent = NULL;
1175	struct binder_node *node;
1176	binder_uintptr_t ptr = fp ? fp->binder : 0;
1177	binder_uintptr_t cookie = fp ? fp->cookie : 0;
1178	__u32 flags = fp ? fp->flags : 0;
1179
1180	assert_spin_locked(&proc->inner_lock);
1181
1182	while (*p) {
1183
1184		parent = *p;
1185		node = rb_entry(parent, struct binder_node, rb_node);
1186
1187		if (ptr < node->ptr)
1188			p = &(*p)->rb_left;
1189		else if (ptr > node->ptr)
1190			p = &(*p)->rb_right;
1191		else {
1192			/*
1193			 * A matching node is already in
1194			 * the rb tree. Abandon the init
1195			 * and return it.
1196			 */
1197			binder_inc_node_tmpref_ilocked(node);
1198			return node;
1199		}
1200	}
1201	node = new_node;
1202	binder_stats_created(BINDER_STAT_NODE);
1203	node->tmp_refs++;
1204	rb_link_node(&node->rb_node, parent, p);
1205	rb_insert_color(&node->rb_node, &proc->nodes);
1206	node->debug_id = atomic_inc_return(&binder_last_id);
1207	node->proc = proc;
1208	node->ptr = ptr;
1209	node->cookie = cookie;
1210	node->work.type = BINDER_WORK_NODE;
1211	node->min_priority = flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1212	node->accept_fds = !!(flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
 
1213	spin_lock_init(&node->lock);
1214	INIT_LIST_HEAD(&node->work.entry);
1215	INIT_LIST_HEAD(&node->async_todo);
1216	binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1217		     "%d:%d node %d u%016llx c%016llx created\n",
1218		     proc->pid, current->pid, node->debug_id,
1219		     (u64)node->ptr, (u64)node->cookie);
1220
1221	return node;
1222}
1223
1224static struct binder_node *binder_new_node(struct binder_proc *proc,
1225					   struct flat_binder_object *fp)
1226{
1227	struct binder_node *node;
1228	struct binder_node *new_node = kzalloc(sizeof(*node), GFP_KERNEL);
1229
1230	if (!new_node)
1231		return NULL;
1232	binder_inner_proc_lock(proc);
1233	node = binder_init_node_ilocked(proc, new_node, fp);
1234	binder_inner_proc_unlock(proc);
1235	if (node != new_node)
1236		/*
1237		 * The node was already added by another thread
1238		 */
1239		kfree(new_node);
1240
1241	return node;
1242}
1243
1244static void binder_free_node(struct binder_node *node)
1245{
1246	kfree(node);
1247	binder_stats_deleted(BINDER_STAT_NODE);
1248}
1249
1250static int binder_inc_node_nilocked(struct binder_node *node, int strong,
1251				    int internal,
1252				    struct list_head *target_list)
1253{
1254	struct binder_proc *proc = node->proc;
1255
1256	assert_spin_locked(&node->lock);
1257	if (proc)
1258		assert_spin_locked(&proc->inner_lock);
1259	if (strong) {
1260		if (internal) {
1261			if (target_list == NULL &&
1262			    node->internal_strong_refs == 0 &&
1263			    !(node->proc &&
1264			      node == node->proc->context->binder_context_mgr_node &&
1265			      node->has_strong_ref)) {
1266				pr_err("invalid inc strong node for %d\n",
1267					node->debug_id);
1268				return -EINVAL;
1269			}
1270			node->internal_strong_refs++;
1271		} else
1272			node->local_strong_refs++;
1273		if (!node->has_strong_ref && target_list) {
 
 
1274			binder_dequeue_work_ilocked(&node->work);
1275			/*
1276			 * Note: this function is the only place where we queue
1277			 * directly to a thread->todo without using the
1278			 * corresponding binder_enqueue_thread_work() helper
1279			 * functions; in this case it's ok to not set the
1280			 * process_todo flag, since we know this node work will
1281			 * always be followed by other work that starts queue
1282			 * processing: in case of synchronous transactions, a
1283			 * BR_REPLY or BR_ERROR; in case of oneway
1284			 * transactions, a BR_TRANSACTION_COMPLETE.
1285			 */
1286			binder_enqueue_work_ilocked(&node->work, target_list);
1287		}
1288	} else {
1289		if (!internal)
1290			node->local_weak_refs++;
1291		if (!node->has_weak_ref && list_empty(&node->work.entry)) {
1292			if (target_list == NULL) {
1293				pr_err("invalid inc weak node for %d\n",
1294					node->debug_id);
1295				return -EINVAL;
1296			}
1297			/*
1298			 * See comment above
1299			 */
1300			binder_enqueue_work_ilocked(&node->work, target_list);
1301		}
1302	}
1303	return 0;
1304}
1305
1306static int binder_inc_node(struct binder_node *node, int strong, int internal,
1307			   struct list_head *target_list)
1308{
1309	int ret;
1310
1311	binder_node_inner_lock(node);
1312	ret = binder_inc_node_nilocked(node, strong, internal, target_list);
1313	binder_node_inner_unlock(node);
1314
1315	return ret;
1316}
1317
1318static bool binder_dec_node_nilocked(struct binder_node *node,
1319				     int strong, int internal)
1320{
1321	struct binder_proc *proc = node->proc;
1322
1323	assert_spin_locked(&node->lock);
1324	if (proc)
1325		assert_spin_locked(&proc->inner_lock);
1326	if (strong) {
1327		if (internal)
1328			node->internal_strong_refs--;
1329		else
1330			node->local_strong_refs--;
1331		if (node->local_strong_refs || node->internal_strong_refs)
1332			return false;
1333	} else {
1334		if (!internal)
1335			node->local_weak_refs--;
1336		if (node->local_weak_refs || node->tmp_refs ||
1337				!hlist_empty(&node->refs))
1338			return false;
1339	}
1340
1341	if (proc && (node->has_strong_ref || node->has_weak_ref)) {
1342		if (list_empty(&node->work.entry)) {
1343			binder_enqueue_work_ilocked(&node->work, &proc->todo);
1344			binder_wakeup_proc_ilocked(proc);
1345		}
1346	} else {
1347		if (hlist_empty(&node->refs) && !node->local_strong_refs &&
1348		    !node->local_weak_refs && !node->tmp_refs) {
1349			if (proc) {
1350				binder_dequeue_work_ilocked(&node->work);
1351				rb_erase(&node->rb_node, &proc->nodes);
1352				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1353					     "refless node %d deleted\n",
1354					     node->debug_id);
1355			} else {
1356				BUG_ON(!list_empty(&node->work.entry));
1357				spin_lock(&binder_dead_nodes_lock);
1358				/*
1359				 * tmp_refs could have changed so
1360				 * check it again
1361				 */
1362				if (node->tmp_refs) {
1363					spin_unlock(&binder_dead_nodes_lock);
1364					return false;
1365				}
1366				hlist_del(&node->dead_node);
1367				spin_unlock(&binder_dead_nodes_lock);
1368				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1369					     "dead node %d deleted\n",
1370					     node->debug_id);
1371			}
1372			return true;
1373		}
1374	}
1375	return false;
1376}
1377
1378static void binder_dec_node(struct binder_node *node, int strong, int internal)
1379{
1380	bool free_node;
1381
1382	binder_node_inner_lock(node);
1383	free_node = binder_dec_node_nilocked(node, strong, internal);
1384	binder_node_inner_unlock(node);
1385	if (free_node)
1386		binder_free_node(node);
1387}
1388
1389static void binder_inc_node_tmpref_ilocked(struct binder_node *node)
1390{
1391	/*
1392	 * No call to binder_inc_node() is needed since we
1393	 * don't need to inform userspace of any changes to
1394	 * tmp_refs
1395	 */
1396	node->tmp_refs++;
1397}
1398
1399/**
1400 * binder_inc_node_tmpref() - take a temporary reference on node
1401 * @node:	node to reference
1402 *
1403 * Take reference on node to prevent the node from being freed
1404 * while referenced only by a local variable. The inner lock is
1405 * needed to serialize with the node work on the queue (which
1406 * isn't needed after the node is dead). If the node is dead
1407 * (node->proc is NULL), use binder_dead_nodes_lock to protect
1408 * node->tmp_refs against dead-node-only cases where the node
1409 * lock cannot be acquired (eg traversing the dead node list to
1410 * print nodes)
1411 */
1412static void binder_inc_node_tmpref(struct binder_node *node)
1413{
1414	binder_node_lock(node);
1415	if (node->proc)
1416		binder_inner_proc_lock(node->proc);
1417	else
1418		spin_lock(&binder_dead_nodes_lock);
1419	binder_inc_node_tmpref_ilocked(node);
1420	if (node->proc)
1421		binder_inner_proc_unlock(node->proc);
1422	else
1423		spin_unlock(&binder_dead_nodes_lock);
1424	binder_node_unlock(node);
1425}
1426
1427/**
1428 * binder_dec_node_tmpref() - remove a temporary reference on node
1429 * @node:	node to reference
1430 *
1431 * Release temporary reference on node taken via binder_inc_node_tmpref()
1432 */
1433static void binder_dec_node_tmpref(struct binder_node *node)
1434{
1435	bool free_node;
1436
1437	binder_node_inner_lock(node);
1438	if (!node->proc)
1439		spin_lock(&binder_dead_nodes_lock);
 
 
1440	node->tmp_refs--;
1441	BUG_ON(node->tmp_refs < 0);
1442	if (!node->proc)
1443		spin_unlock(&binder_dead_nodes_lock);
 
 
1444	/*
1445	 * Call binder_dec_node() to check if all refcounts are 0
1446	 * and cleanup is needed. Calling with strong=0 and internal=1
1447	 * causes no actual reference to be released in binder_dec_node().
1448	 * If that changes, a change is needed here too.
1449	 */
1450	free_node = binder_dec_node_nilocked(node, 0, 1);
1451	binder_node_inner_unlock(node);
1452	if (free_node)
1453		binder_free_node(node);
1454}
1455
1456static void binder_put_node(struct binder_node *node)
1457{
1458	binder_dec_node_tmpref(node);
1459}
1460
1461static struct binder_ref *binder_get_ref_olocked(struct binder_proc *proc,
1462						 u32 desc, bool need_strong_ref)
1463{
1464	struct rb_node *n = proc->refs_by_desc.rb_node;
1465	struct binder_ref *ref;
1466
1467	while (n) {
1468		ref = rb_entry(n, struct binder_ref, rb_node_desc);
1469
1470		if (desc < ref->data.desc) {
1471			n = n->rb_left;
1472		} else if (desc > ref->data.desc) {
1473			n = n->rb_right;
1474		} else if (need_strong_ref && !ref->data.strong) {
1475			binder_user_error("tried to use weak ref as strong ref\n");
1476			return NULL;
1477		} else {
1478			return ref;
1479		}
1480	}
1481	return NULL;
1482}
1483
1484/**
1485 * binder_get_ref_for_node_olocked() - get the ref associated with given node
1486 * @proc:	binder_proc that owns the ref
1487 * @node:	binder_node of target
1488 * @new_ref:	newly allocated binder_ref to be initialized or %NULL
1489 *
1490 * Look up the ref for the given node and return it if it exists
1491 *
1492 * If it doesn't exist and the caller provides a newly allocated
1493 * ref, initialize the fields of the newly allocated ref and insert
1494 * into the given proc rb_trees and node refs list.
1495 *
1496 * Return:	the ref for node. It is possible that another thread
1497 *		allocated/initialized the ref first in which case the
1498 *		returned ref would be different than the passed-in
1499 *		new_ref. new_ref must be kfree'd by the caller in
1500 *		this case.
1501 */
1502static struct binder_ref *binder_get_ref_for_node_olocked(
1503					struct binder_proc *proc,
1504					struct binder_node *node,
1505					struct binder_ref *new_ref)
1506{
1507	struct binder_context *context = proc->context;
1508	struct rb_node **p = &proc->refs_by_node.rb_node;
1509	struct rb_node *parent = NULL;
1510	struct binder_ref *ref;
1511	struct rb_node *n;
1512
1513	while (*p) {
1514		parent = *p;
1515		ref = rb_entry(parent, struct binder_ref, rb_node_node);
1516
1517		if (node < ref->node)
1518			p = &(*p)->rb_left;
1519		else if (node > ref->node)
1520			p = &(*p)->rb_right;
1521		else
1522			return ref;
1523	}
1524	if (!new_ref)
1525		return NULL;
1526
1527	binder_stats_created(BINDER_STAT_REF);
1528	new_ref->data.debug_id = atomic_inc_return(&binder_last_id);
1529	new_ref->proc = proc;
1530	new_ref->node = node;
1531	rb_link_node(&new_ref->rb_node_node, parent, p);
1532	rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1533
1534	new_ref->data.desc = (node == context->binder_context_mgr_node) ? 0 : 1;
1535	for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1536		ref = rb_entry(n, struct binder_ref, rb_node_desc);
1537		if (ref->data.desc > new_ref->data.desc)
1538			break;
1539		new_ref->data.desc = ref->data.desc + 1;
1540	}
1541
1542	p = &proc->refs_by_desc.rb_node;
1543	while (*p) {
1544		parent = *p;
1545		ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1546
1547		if (new_ref->data.desc < ref->data.desc)
1548			p = &(*p)->rb_left;
1549		else if (new_ref->data.desc > ref->data.desc)
1550			p = &(*p)->rb_right;
1551		else
1552			BUG();
1553	}
1554	rb_link_node(&new_ref->rb_node_desc, parent, p);
1555	rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1556
1557	binder_node_lock(node);
1558	hlist_add_head(&new_ref->node_entry, &node->refs);
1559
1560	binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1561		     "%d new ref %d desc %d for node %d\n",
1562		      proc->pid, new_ref->data.debug_id, new_ref->data.desc,
1563		      node->debug_id);
1564	binder_node_unlock(node);
1565	return new_ref;
1566}
1567
1568static void binder_cleanup_ref_olocked(struct binder_ref *ref)
1569{
1570	bool delete_node = false;
1571
1572	binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1573		     "%d delete ref %d desc %d for node %d\n",
1574		      ref->proc->pid, ref->data.debug_id, ref->data.desc,
1575		      ref->node->debug_id);
1576
1577	rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1578	rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1579
1580	binder_node_inner_lock(ref->node);
1581	if (ref->data.strong)
1582		binder_dec_node_nilocked(ref->node, 1, 1);
1583
1584	hlist_del(&ref->node_entry);
1585	delete_node = binder_dec_node_nilocked(ref->node, 0, 1);
1586	binder_node_inner_unlock(ref->node);
1587	/*
1588	 * Clear ref->node unless we want the caller to free the node
1589	 */
1590	if (!delete_node) {
1591		/*
1592		 * The caller uses ref->node to determine
1593		 * whether the node needs to be freed. Clear
1594		 * it since the node is still alive.
1595		 */
1596		ref->node = NULL;
1597	}
1598
1599	if (ref->death) {
1600		binder_debug(BINDER_DEBUG_DEAD_BINDER,
1601			     "%d delete ref %d desc %d has death notification\n",
1602			      ref->proc->pid, ref->data.debug_id,
1603			      ref->data.desc);
1604		binder_dequeue_work(ref->proc, &ref->death->work);
1605		binder_stats_deleted(BINDER_STAT_DEATH);
1606	}
1607	binder_stats_deleted(BINDER_STAT_REF);
1608}
1609
1610/**
1611 * binder_inc_ref_olocked() - increment the ref for given handle
1612 * @ref:         ref to be incremented
1613 * @strong:      if true, strong increment, else weak
1614 * @target_list: list to queue node work on
1615 *
1616 * Increment the ref. @ref->proc->outer_lock must be held on entry
1617 *
1618 * Return: 0, if successful, else errno
1619 */
1620static int binder_inc_ref_olocked(struct binder_ref *ref, int strong,
1621				  struct list_head *target_list)
1622{
1623	int ret;
1624
1625	if (strong) {
1626		if (ref->data.strong == 0) {
1627			ret = binder_inc_node(ref->node, 1, 1, target_list);
1628			if (ret)
1629				return ret;
1630		}
1631		ref->data.strong++;
1632	} else {
1633		if (ref->data.weak == 0) {
1634			ret = binder_inc_node(ref->node, 0, 1, target_list);
1635			if (ret)
1636				return ret;
1637		}
1638		ref->data.weak++;
1639	}
1640	return 0;
1641}
1642
1643/**
1644 * binder_dec_ref() - dec the ref for given handle
1645 * @ref:	ref to be decremented
1646 * @strong:	if true, strong decrement, else weak
1647 *
1648 * Decrement the ref.
1649 *
1650 * Return: true if ref is cleaned up and ready to be freed
1651 */
1652static bool binder_dec_ref_olocked(struct binder_ref *ref, int strong)
1653{
1654	if (strong) {
1655		if (ref->data.strong == 0) {
1656			binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1657					  ref->proc->pid, ref->data.debug_id,
1658					  ref->data.desc, ref->data.strong,
1659					  ref->data.weak);
1660			return false;
1661		}
1662		ref->data.strong--;
1663		if (ref->data.strong == 0)
1664			binder_dec_node(ref->node, strong, 1);
1665	} else {
1666		if (ref->data.weak == 0) {
1667			binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1668					  ref->proc->pid, ref->data.debug_id,
1669					  ref->data.desc, ref->data.strong,
1670					  ref->data.weak);
1671			return false;
1672		}
1673		ref->data.weak--;
1674	}
1675	if (ref->data.strong == 0 && ref->data.weak == 0) {
1676		binder_cleanup_ref_olocked(ref);
1677		return true;
1678	}
1679	return false;
1680}
1681
1682/**
1683 * binder_get_node_from_ref() - get the node from the given proc/desc
1684 * @proc:	proc containing the ref
1685 * @desc:	the handle associated with the ref
1686 * @need_strong_ref: if true, only return node if ref is strong
1687 * @rdata:	the id/refcount data for the ref
1688 *
1689 * Given a proc and ref handle, return the associated binder_node
1690 *
1691 * Return: a binder_node or NULL if not found or not strong when strong required
1692 */
1693static struct binder_node *binder_get_node_from_ref(
1694		struct binder_proc *proc,
1695		u32 desc, bool need_strong_ref,
1696		struct binder_ref_data *rdata)
1697{
1698	struct binder_node *node;
1699	struct binder_ref *ref;
1700
1701	binder_proc_lock(proc);
1702	ref = binder_get_ref_olocked(proc, desc, need_strong_ref);
1703	if (!ref)
1704		goto err_no_ref;
1705	node = ref->node;
1706	/*
1707	 * Take an implicit reference on the node to ensure
1708	 * it stays alive until the call to binder_put_node()
1709	 */
1710	binder_inc_node_tmpref(node);
1711	if (rdata)
1712		*rdata = ref->data;
1713	binder_proc_unlock(proc);
1714
1715	return node;
1716
1717err_no_ref:
1718	binder_proc_unlock(proc);
1719	return NULL;
1720}
1721
1722/**
1723 * binder_free_ref() - free the binder_ref
1724 * @ref:	ref to free
1725 *
1726 * Free the binder_ref. Free the binder_node indicated by ref->node
1727 * (if non-NULL) and the binder_ref_death indicated by ref->death.
1728 */
1729static void binder_free_ref(struct binder_ref *ref)
1730{
1731	if (ref->node)
1732		binder_free_node(ref->node);
1733	kfree(ref->death);
1734	kfree(ref);
1735}
1736
1737/**
1738 * binder_update_ref_for_handle() - inc/dec the ref for given handle
1739 * @proc:	proc containing the ref
1740 * @desc:	the handle associated with the ref
1741 * @increment:	true=inc reference, false=dec reference
1742 * @strong:	true=strong reference, false=weak reference
1743 * @rdata:	the id/refcount data for the ref
1744 *
1745 * Given a proc and ref handle, increment or decrement the ref
1746 * according to "increment" arg.
1747 *
1748 * Return: 0 if successful, else errno
1749 */
1750static int binder_update_ref_for_handle(struct binder_proc *proc,
1751		uint32_t desc, bool increment, bool strong,
1752		struct binder_ref_data *rdata)
1753{
1754	int ret = 0;
1755	struct binder_ref *ref;
1756	bool delete_ref = false;
1757
1758	binder_proc_lock(proc);
1759	ref = binder_get_ref_olocked(proc, desc, strong);
1760	if (!ref) {
1761		ret = -EINVAL;
1762		goto err_no_ref;
1763	}
1764	if (increment)
1765		ret = binder_inc_ref_olocked(ref, strong, NULL);
1766	else
1767		delete_ref = binder_dec_ref_olocked(ref, strong);
1768
1769	if (rdata)
1770		*rdata = ref->data;
1771	binder_proc_unlock(proc);
1772
1773	if (delete_ref)
1774		binder_free_ref(ref);
1775	return ret;
1776
1777err_no_ref:
1778	binder_proc_unlock(proc);
1779	return ret;
1780}
1781
1782/**
1783 * binder_dec_ref_for_handle() - dec the ref for given handle
1784 * @proc:	proc containing the ref
1785 * @desc:	the handle associated with the ref
1786 * @strong:	true=strong reference, false=weak reference
1787 * @rdata:	the id/refcount data for the ref
1788 *
1789 * Just calls binder_update_ref_for_handle() to decrement the ref.
1790 *
1791 * Return: 0 if successful, else errno
1792 */
1793static int binder_dec_ref_for_handle(struct binder_proc *proc,
1794		uint32_t desc, bool strong, struct binder_ref_data *rdata)
1795{
1796	return binder_update_ref_for_handle(proc, desc, false, strong, rdata);
1797}
1798
1799
1800/**
1801 * binder_inc_ref_for_node() - increment the ref for given proc/node
1802 * @proc:	 proc containing the ref
1803 * @node:	 target node
1804 * @strong:	 true=strong reference, false=weak reference
1805 * @target_list: worklist to use if node is incremented
1806 * @rdata:	 the id/refcount data for the ref
1807 *
1808 * Given a proc and node, increment the ref. Create the ref if it
1809 * doesn't already exist
1810 *
1811 * Return: 0 if successful, else errno
1812 */
1813static int binder_inc_ref_for_node(struct binder_proc *proc,
1814			struct binder_node *node,
1815			bool strong,
1816			struct list_head *target_list,
1817			struct binder_ref_data *rdata)
1818{
1819	struct binder_ref *ref;
1820	struct binder_ref *new_ref = NULL;
1821	int ret = 0;
1822
1823	binder_proc_lock(proc);
1824	ref = binder_get_ref_for_node_olocked(proc, node, NULL);
1825	if (!ref) {
1826		binder_proc_unlock(proc);
1827		new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1828		if (!new_ref)
1829			return -ENOMEM;
1830		binder_proc_lock(proc);
1831		ref = binder_get_ref_for_node_olocked(proc, node, new_ref);
1832	}
1833	ret = binder_inc_ref_olocked(ref, strong, target_list);
1834	*rdata = ref->data;
 
 
 
 
 
 
 
 
 
 
 
 
1835	binder_proc_unlock(proc);
1836	if (new_ref && ref != new_ref)
1837		/*
1838		 * Another thread created the ref first so
1839		 * free the one we allocated
1840		 */
1841		kfree(new_ref);
1842	return ret;
1843}
1844
1845static void binder_pop_transaction_ilocked(struct binder_thread *target_thread,
1846					   struct binder_transaction *t)
1847{
1848	BUG_ON(!target_thread);
1849	assert_spin_locked(&target_thread->proc->inner_lock);
1850	BUG_ON(target_thread->transaction_stack != t);
1851	BUG_ON(target_thread->transaction_stack->from != target_thread);
1852	target_thread->transaction_stack =
1853		target_thread->transaction_stack->from_parent;
1854	t->from = NULL;
1855}
1856
1857/**
1858 * binder_thread_dec_tmpref() - decrement thread->tmp_ref
1859 * @thread:	thread to decrement
1860 *
1861 * A thread needs to be kept alive while being used to create or
1862 * handle a transaction. binder_get_txn_from() is used to safely
1863 * extract t->from from a binder_transaction and keep the thread
1864 * indicated by t->from from being freed. When done with that
1865 * binder_thread, this function is called to decrement the
1866 * tmp_ref and free if appropriate (thread has been released
1867 * and no transaction being processed by the driver)
1868 */
1869static void binder_thread_dec_tmpref(struct binder_thread *thread)
1870{
1871	/*
1872	 * atomic is used to protect the counter value while
1873	 * it cannot reach zero or thread->is_dead is false
1874	 */
1875	binder_inner_proc_lock(thread->proc);
1876	atomic_dec(&thread->tmp_ref);
1877	if (thread->is_dead && !atomic_read(&thread->tmp_ref)) {
1878		binder_inner_proc_unlock(thread->proc);
1879		binder_free_thread(thread);
1880		return;
1881	}
1882	binder_inner_proc_unlock(thread->proc);
1883}
1884
1885/**
1886 * binder_proc_dec_tmpref() - decrement proc->tmp_ref
1887 * @proc:	proc to decrement
1888 *
1889 * A binder_proc needs to be kept alive while being used to create or
1890 * handle a transaction. proc->tmp_ref is incremented when
1891 * creating a new transaction or the binder_proc is currently in-use
1892 * by threads that are being released. When done with the binder_proc,
1893 * this function is called to decrement the counter and free the
1894 * proc if appropriate (proc has been released, all threads have
1895 * been released and not currenly in-use to process a transaction).
1896 */
1897static void binder_proc_dec_tmpref(struct binder_proc *proc)
1898{
1899	binder_inner_proc_lock(proc);
1900	proc->tmp_ref--;
1901	if (proc->is_dead && RB_EMPTY_ROOT(&proc->threads) &&
1902			!proc->tmp_ref) {
1903		binder_inner_proc_unlock(proc);
1904		binder_free_proc(proc);
1905		return;
1906	}
1907	binder_inner_proc_unlock(proc);
1908}
1909
1910/**
1911 * binder_get_txn_from() - safely extract the "from" thread in transaction
1912 * @t:	binder transaction for t->from
1913 *
1914 * Atomically return the "from" thread and increment the tmp_ref
1915 * count for the thread to ensure it stays alive until
1916 * binder_thread_dec_tmpref() is called.
1917 *
1918 * Return: the value of t->from
1919 */
1920static struct binder_thread *binder_get_txn_from(
1921		struct binder_transaction *t)
1922{
1923	struct binder_thread *from;
1924
1925	spin_lock(&t->lock);
1926	from = t->from;
1927	if (from)
1928		atomic_inc(&from->tmp_ref);
1929	spin_unlock(&t->lock);
1930	return from;
1931}
1932
1933/**
1934 * binder_get_txn_from_and_acq_inner() - get t->from and acquire inner lock
1935 * @t:	binder transaction for t->from
1936 *
1937 * Same as binder_get_txn_from() except it also acquires the proc->inner_lock
1938 * to guarantee that the thread cannot be released while operating on it.
1939 * The caller must call binder_inner_proc_unlock() to release the inner lock
1940 * as well as call binder_dec_thread_txn() to release the reference.
1941 *
1942 * Return: the value of t->from
1943 */
1944static struct binder_thread *binder_get_txn_from_and_acq_inner(
1945		struct binder_transaction *t)
 
1946{
1947	struct binder_thread *from;
1948
1949	from = binder_get_txn_from(t);
1950	if (!from)
 
1951		return NULL;
 
1952	binder_inner_proc_lock(from->proc);
1953	if (t->from) {
1954		BUG_ON(from != t->from);
1955		return from;
1956	}
1957	binder_inner_proc_unlock(from->proc);
 
1958	binder_thread_dec_tmpref(from);
1959	return NULL;
1960}
1961
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1962static void binder_free_transaction(struct binder_transaction *t)
1963{
1964	if (t->buffer)
1965		t->buffer->transaction = NULL;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1966	kfree(t);
1967	binder_stats_deleted(BINDER_STAT_TRANSACTION);
1968}
1969
1970static void binder_send_failed_reply(struct binder_transaction *t,
1971				     uint32_t error_code)
1972{
1973	struct binder_thread *target_thread;
1974	struct binder_transaction *next;
1975
1976	BUG_ON(t->flags & TF_ONE_WAY);
1977	while (1) {
1978		target_thread = binder_get_txn_from_and_acq_inner(t);
1979		if (target_thread) {
1980			binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1981				     "send failed reply for transaction %d to %d:%d\n",
1982				      t->debug_id,
1983				      target_thread->proc->pid,
1984				      target_thread->pid);
1985
1986			binder_pop_transaction_ilocked(target_thread, t);
1987			if (target_thread->reply_error.cmd == BR_OK) {
1988				target_thread->reply_error.cmd = error_code;
1989				binder_enqueue_thread_work_ilocked(
1990					target_thread,
1991					&target_thread->reply_error.work);
1992				wake_up_interruptible(&target_thread->wait);
1993			} else {
1994				/*
1995				 * Cannot get here for normal operation, but
1996				 * we can if multiple synchronous transactions
1997				 * are sent without blocking for responses.
1998				 * Just ignore the 2nd error in this case.
1999				 */
2000				pr_warn("Unexpected reply error: %u\n",
2001					target_thread->reply_error.cmd);
2002			}
2003			binder_inner_proc_unlock(target_thread->proc);
2004			binder_thread_dec_tmpref(target_thread);
2005			binder_free_transaction(t);
2006			return;
2007		}
 
2008		next = t->from_parent;
2009
2010		binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2011			     "send failed reply for transaction %d, target dead\n",
2012			     t->debug_id);
2013
2014		binder_free_transaction(t);
2015		if (next == NULL) {
2016			binder_debug(BINDER_DEBUG_DEAD_BINDER,
2017				     "reply failed, no target thread at root\n");
2018			return;
2019		}
2020		t = next;
2021		binder_debug(BINDER_DEBUG_DEAD_BINDER,
2022			     "reply failed, no target thread -- retry %d\n",
2023			      t->debug_id);
2024	}
2025}
2026
2027/**
2028 * binder_cleanup_transaction() - cleans up undelivered transaction
2029 * @t:		transaction that needs to be cleaned up
2030 * @reason:	reason the transaction wasn't delivered
2031 * @error_code:	error to return to caller (if synchronous call)
2032 */
2033static void binder_cleanup_transaction(struct binder_transaction *t,
2034				       const char *reason,
2035				       uint32_t error_code)
2036{
2037	if (t->buffer->target_node && !(t->flags & TF_ONE_WAY)) {
2038		binder_send_failed_reply(t, error_code);
2039	} else {
2040		binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2041			"undelivered transaction %d, %s\n",
2042			t->debug_id, reason);
2043		binder_free_transaction(t);
2044	}
2045}
2046
2047/**
2048 * binder_validate_object() - checks for a valid metadata object in a buffer.
 
 
2049 * @buffer:	binder_buffer that we're parsing.
2050 * @offset:	offset in the buffer at which to validate an object.
 
2051 *
2052 * Return:	If there's a valid metadata object at @offset in @buffer, the
2053 *		size of that object. Otherwise, it returns zero.
2054 */
2055static size_t binder_validate_object(struct binder_buffer *buffer, u64 offset)
 
 
 
 
 
 
 
 
 
2056{
2057	/* Check if we can read a header first */
2058	struct binder_object_header *hdr;
2059	size_t object_size = 0;
2060
2061	if (offset > buffer->data_size - sizeof(*hdr) ||
2062	    buffer->data_size < sizeof(*hdr) ||
2063	    !IS_ALIGNED(offset, sizeof(u32)))
2064		return 0;
 
 
 
 
 
 
 
 
2065
2066	/* Ok, now see if we can read a complete object. */
2067	hdr = (struct binder_object_header *)(buffer->data + offset);
2068	switch (hdr->type) {
2069	case BINDER_TYPE_BINDER:
2070	case BINDER_TYPE_WEAK_BINDER:
2071	case BINDER_TYPE_HANDLE:
2072	case BINDER_TYPE_WEAK_HANDLE:
2073		object_size = sizeof(struct flat_binder_object);
2074		break;
2075	case BINDER_TYPE_FD:
2076		object_size = sizeof(struct binder_fd_object);
2077		break;
2078	case BINDER_TYPE_PTR:
2079		object_size = sizeof(struct binder_buffer_object);
2080		break;
2081	case BINDER_TYPE_FDA:
2082		object_size = sizeof(struct binder_fd_array_object);
2083		break;
2084	default:
2085		return 0;
2086	}
2087	if (offset <= buffer->data_size - object_size &&
2088	    buffer->data_size >= object_size)
2089		return object_size;
2090	else
2091		return 0;
2092}
2093
2094/**
2095 * binder_validate_ptr() - validates binder_buffer_object in a binder_buffer.
 
2096 * @b:		binder_buffer containing the object
 
2097 * @index:	index in offset array at which the binder_buffer_object is
2098 *		located
2099 * @start:	points to the start of the offset array
 
2100 * @num_valid:	the number of valid offsets in the offset array
2101 *
2102 * Return:	If @index is within the valid range of the offset array
2103 *		described by @start and @num_valid, and if there's a valid
2104 *		binder_buffer_object at the offset found in index @index
2105 *		of the offset array, that object is returned. Otherwise,
2106 *		%NULL is returned.
2107 *		Note that the offset found in index @index itself is not
2108 *		verified; this function assumes that @num_valid elements
2109 *		from @start were previously verified to have valid offsets.
 
 
2110 */
2111static struct binder_buffer_object *binder_validate_ptr(struct binder_buffer *b,
2112							binder_size_t index,
2113							binder_size_t *start,
2114							binder_size_t num_valid)
2115{
2116	struct binder_buffer_object *buffer_obj;
2117	binder_size_t *offp;
 
 
 
 
 
2118
2119	if (index >= num_valid)
2120		return NULL;
2121
2122	offp = start + index;
2123	buffer_obj = (struct binder_buffer_object *)(b->data + *offp);
2124	if (buffer_obj->hdr.type != BINDER_TYPE_PTR)
 
 
 
 
2125		return NULL;
 
 
2126
2127	return buffer_obj;
2128}
2129
2130/**
2131 * binder_validate_fixup() - validates pointer/fd fixups happen in order.
 
2132 * @b:			transaction buffer
2133 * @objects_start	start of objects buffer
2134 * @buffer:		binder_buffer_object in which to fix up
2135 * @offset:		start offset in @buffer to fix up
2136 * @last_obj:		last binder_buffer_object that we fixed up in
2137 * @last_min_offset:	minimum fixup offset in @last_obj
2138 *
2139 * Return:		%true if a fixup in buffer @buffer at offset @offset is
2140 *			allowed.
2141 *
2142 * For safety reasons, we only allow fixups inside a buffer to happen
2143 * at increasing offsets; additionally, we only allow fixup on the last
2144 * buffer object that was verified, or one of its parents.
2145 *
2146 * Example of what is allowed:
2147 *
2148 * A
2149 *   B (parent = A, offset = 0)
2150 *   C (parent = A, offset = 16)
2151 *     D (parent = C, offset = 0)
2152 *   E (parent = A, offset = 32) // min_offset is 16 (C.parent_offset)
2153 *
2154 * Examples of what is not allowed:
2155 *
2156 * Decreasing offsets within the same parent:
2157 * A
2158 *   C (parent = A, offset = 16)
2159 *   B (parent = A, offset = 0) // decreasing offset within A
2160 *
2161 * Referring to a parent that wasn't the last object or any of its parents:
2162 * A
2163 *   B (parent = A, offset = 0)
2164 *   C (parent = A, offset = 0)
2165 *   C (parent = A, offset = 16)
2166 *     D (parent = B, offset = 0) // B is not A or any of A's parents
2167 */
2168static bool binder_validate_fixup(struct binder_buffer *b,
2169				  binder_size_t *objects_start,
2170				  struct binder_buffer_object *buffer,
 
2171				  binder_size_t fixup_offset,
2172				  struct binder_buffer_object *last_obj,
2173				  binder_size_t last_min_offset)
2174{
2175	if (!last_obj) {
2176		/* Nothing to fix up in */
2177		return false;
2178	}
2179
2180	while (last_obj != buffer) {
 
 
 
 
 
 
 
 
 
 
2181		/*
2182		 * Safe to retrieve the parent of last_obj, since it
2183		 * was already previously verified by the driver.
2184		 */
2185		if ((last_obj->flags & BINDER_BUFFER_FLAG_HAS_PARENT) == 0)
 
 
 
 
 
 
 
 
2186			return false;
2187		last_min_offset = last_obj->parent_offset + sizeof(uintptr_t);
2188		last_obj = (struct binder_buffer_object *)
2189			(b->data + *(objects_start + last_obj->parent));
2190	}
2191	return (fixup_offset >= last_min_offset);
2192}
2193
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2194static void binder_transaction_buffer_release(struct binder_proc *proc,
 
2195					      struct binder_buffer *buffer,
2196					      binder_size_t *failed_at)
 
2197{
2198	binder_size_t *offp, *off_start, *off_end;
2199	int debug_id = buffer->debug_id;
 
2200
2201	binder_debug(BINDER_DEBUG_TRANSACTION,
2202		     "%d buffer release %d, size %zd-%zd, failed at %pK\n",
2203		     proc->pid, buffer->debug_id,
2204		     buffer->data_size, buffer->offsets_size, failed_at);
 
2205
2206	if (buffer->target_node)
2207		binder_dec_node(buffer->target_node, 1, 0);
2208
2209	off_start = (binder_size_t *)(buffer->data +
2210				      ALIGN(buffer->data_size, sizeof(void *)));
2211	if (failed_at)
2212		off_end = failed_at;
2213	else
2214		off_end = (void *)off_start + buffer->offsets_size;
2215	for (offp = off_start; offp < off_end; offp++) {
2216		struct binder_object_header *hdr;
2217		size_t object_size = binder_validate_object(buffer, *offp);
2218
 
 
 
 
 
 
 
 
 
 
 
 
2219		if (object_size == 0) {
2220			pr_err("transaction release %d bad object at offset %lld, size %zd\n",
2221			       debug_id, (u64)*offp, buffer->data_size);
2222			continue;
2223		}
2224		hdr = (struct binder_object_header *)(buffer->data + *offp);
2225		switch (hdr->type) {
2226		case BINDER_TYPE_BINDER:
2227		case BINDER_TYPE_WEAK_BINDER: {
2228			struct flat_binder_object *fp;
2229			struct binder_node *node;
2230
2231			fp = to_flat_binder_object(hdr);
2232			node = binder_get_node(proc, fp->binder);
2233			if (node == NULL) {
2234				pr_err("transaction release %d bad node %016llx\n",
2235				       debug_id, (u64)fp->binder);
2236				break;
2237			}
2238			binder_debug(BINDER_DEBUG_TRANSACTION,
2239				     "        node %d u%016llx\n",
2240				     node->debug_id, (u64)node->ptr);
2241			binder_dec_node(node, hdr->type == BINDER_TYPE_BINDER,
2242					0);
2243			binder_put_node(node);
2244		} break;
2245		case BINDER_TYPE_HANDLE:
2246		case BINDER_TYPE_WEAK_HANDLE: {
2247			struct flat_binder_object *fp;
2248			struct binder_ref_data rdata;
2249			int ret;
2250
2251			fp = to_flat_binder_object(hdr);
2252			ret = binder_dec_ref_for_handle(proc, fp->handle,
2253				hdr->type == BINDER_TYPE_HANDLE, &rdata);
2254
2255			if (ret) {
2256				pr_err("transaction release %d bad handle %d, ret = %d\n",
2257				 debug_id, fp->handle, ret);
2258				break;
2259			}
2260			binder_debug(BINDER_DEBUG_TRANSACTION,
2261				     "        ref %d desc %d\n",
2262				     rdata.debug_id, rdata.desc);
2263		} break;
2264
2265		case BINDER_TYPE_FD: {
2266			struct binder_fd_object *fp = to_binder_fd_object(hdr);
2267
2268			binder_debug(BINDER_DEBUG_TRANSACTION,
2269				     "        fd %d\n", fp->fd);
2270			if (failed_at)
2271				task_close_fd(proc, fp->fd);
 
 
 
2272		} break;
2273		case BINDER_TYPE_PTR:
2274			/*
2275			 * Nothing to do here, this will get cleaned up when the
2276			 * transaction buffer gets freed
2277			 */
2278			break;
2279		case BINDER_TYPE_FDA: {
2280			struct binder_fd_array_object *fda;
2281			struct binder_buffer_object *parent;
2282			uintptr_t parent_buffer;
2283			u32 *fd_array;
2284			size_t fd_index;
2285			binder_size_t fd_buf_size;
 
 
 
 
 
 
 
 
 
2286
 
 
2287			fda = to_binder_fd_array_object(hdr);
2288			parent = binder_validate_ptr(buffer, fda->parent,
2289						     off_start,
2290						     offp - off_start);
 
 
2291			if (!parent) {
2292				pr_err("transaction release %d bad parent offset\n",
2293				       debug_id);
2294				continue;
2295			}
2296			/*
2297			 * Since the parent was already fixed up, convert it
2298			 * back to kernel address space to access it
2299			 */
2300			parent_buffer = parent->buffer -
2301				binder_alloc_get_user_buffer_offset(
2302						&proc->alloc);
2303
2304			fd_buf_size = sizeof(u32) * fda->num_fds;
2305			if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
2306				pr_err("transaction release %d invalid number of fds (%lld)\n",
2307				       debug_id, (u64)fda->num_fds);
2308				continue;
2309			}
2310			if (fd_buf_size > parent->length ||
2311			    fda->parent_offset > parent->length - fd_buf_size) {
2312				/* No space for all file descriptors here. */
2313				pr_err("transaction release %d not enough space for %lld fds in buffer\n",
2314				       debug_id, (u64)fda->num_fds);
2315				continue;
2316			}
2317			fd_array = (u32 *)(parent_buffer + (uintptr_t)fda->parent_offset);
2318			for (fd_index = 0; fd_index < fda->num_fds; fd_index++)
2319				task_close_fd(proc, fd_array[fd_index]);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2320		} break;
2321		default:
2322			pr_err("transaction release %d bad object type %x\n",
2323				debug_id, hdr->type);
2324			break;
2325		}
2326	}
2327}
2328
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2329static int binder_translate_binder(struct flat_binder_object *fp,
2330				   struct binder_transaction *t,
2331				   struct binder_thread *thread)
2332{
2333	struct binder_node *node;
2334	struct binder_proc *proc = thread->proc;
2335	struct binder_proc *target_proc = t->to_proc;
2336	struct binder_ref_data rdata;
2337	int ret = 0;
2338
2339	node = binder_get_node(proc, fp->binder);
2340	if (!node) {
2341		node = binder_new_node(proc, fp);
2342		if (!node)
2343			return -ENOMEM;
2344	}
2345	if (fp->cookie != node->cookie) {
2346		binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
2347				  proc->pid, thread->pid, (u64)fp->binder,
2348				  node->debug_id, (u64)fp->cookie,
2349				  (u64)node->cookie);
2350		ret = -EINVAL;
2351		goto done;
2352	}
2353	if (security_binder_transfer_binder(proc->tsk, target_proc->tsk)) {
2354		ret = -EPERM;
2355		goto done;
2356	}
2357
2358	ret = binder_inc_ref_for_node(target_proc, node,
2359			fp->hdr.type == BINDER_TYPE_BINDER,
2360			&thread->todo, &rdata);
2361	if (ret)
2362		goto done;
2363
2364	if (fp->hdr.type == BINDER_TYPE_BINDER)
2365		fp->hdr.type = BINDER_TYPE_HANDLE;
2366	else
2367		fp->hdr.type = BINDER_TYPE_WEAK_HANDLE;
2368	fp->binder = 0;
2369	fp->handle = rdata.desc;
2370	fp->cookie = 0;
2371
2372	trace_binder_transaction_node_to_ref(t, node, &rdata);
2373	binder_debug(BINDER_DEBUG_TRANSACTION,
2374		     "        node %d u%016llx -> ref %d desc %d\n",
2375		     node->debug_id, (u64)node->ptr,
2376		     rdata.debug_id, rdata.desc);
2377done:
2378	binder_put_node(node);
2379	return ret;
2380}
2381
2382static int binder_translate_handle(struct flat_binder_object *fp,
2383				   struct binder_transaction *t,
2384				   struct binder_thread *thread)
2385{
2386	struct binder_proc *proc = thread->proc;
2387	struct binder_proc *target_proc = t->to_proc;
2388	struct binder_node *node;
2389	struct binder_ref_data src_rdata;
2390	int ret = 0;
2391
2392	node = binder_get_node_from_ref(proc, fp->handle,
2393			fp->hdr.type == BINDER_TYPE_HANDLE, &src_rdata);
2394	if (!node) {
2395		binder_user_error("%d:%d got transaction with invalid handle, %d\n",
2396				  proc->pid, thread->pid, fp->handle);
2397		return -EINVAL;
2398	}
2399	if (security_binder_transfer_binder(proc->tsk, target_proc->tsk)) {
2400		ret = -EPERM;
2401		goto done;
2402	}
2403
2404	binder_node_lock(node);
2405	if (node->proc == target_proc) {
2406		if (fp->hdr.type == BINDER_TYPE_HANDLE)
2407			fp->hdr.type = BINDER_TYPE_BINDER;
2408		else
2409			fp->hdr.type = BINDER_TYPE_WEAK_BINDER;
2410		fp->binder = node->ptr;
2411		fp->cookie = node->cookie;
2412		if (node->proc)
2413			binder_inner_proc_lock(node->proc);
 
 
2414		binder_inc_node_nilocked(node,
2415					 fp->hdr.type == BINDER_TYPE_BINDER,
2416					 0, NULL);
2417		if (node->proc)
2418			binder_inner_proc_unlock(node->proc);
 
 
2419		trace_binder_transaction_ref_to_node(t, node, &src_rdata);
2420		binder_debug(BINDER_DEBUG_TRANSACTION,
2421			     "        ref %d desc %d -> node %d u%016llx\n",
2422			     src_rdata.debug_id, src_rdata.desc, node->debug_id,
2423			     (u64)node->ptr);
2424		binder_node_unlock(node);
2425	} else {
2426		struct binder_ref_data dest_rdata;
2427
2428		binder_node_unlock(node);
2429		ret = binder_inc_ref_for_node(target_proc, node,
2430				fp->hdr.type == BINDER_TYPE_HANDLE,
2431				NULL, &dest_rdata);
2432		if (ret)
2433			goto done;
2434
2435		fp->binder = 0;
2436		fp->handle = dest_rdata.desc;
2437		fp->cookie = 0;
2438		trace_binder_transaction_ref_to_ref(t, node, &src_rdata,
2439						    &dest_rdata);
2440		binder_debug(BINDER_DEBUG_TRANSACTION,
2441			     "        ref %d desc %d -> ref %d desc %d (node %d)\n",
2442			     src_rdata.debug_id, src_rdata.desc,
2443			     dest_rdata.debug_id, dest_rdata.desc,
2444			     node->debug_id);
2445	}
2446done:
2447	binder_put_node(node);
2448	return ret;
2449}
2450
2451static int binder_translate_fd(int fd,
2452			       struct binder_transaction *t,
2453			       struct binder_thread *thread,
2454			       struct binder_transaction *in_reply_to)
2455{
2456	struct binder_proc *proc = thread->proc;
2457	struct binder_proc *target_proc = t->to_proc;
2458	int target_fd;
2459	struct file *file;
2460	int ret;
2461	bool target_allows_fd;
2462
2463	if (in_reply_to)
2464		target_allows_fd = !!(in_reply_to->flags & TF_ACCEPT_FDS);
2465	else
2466		target_allows_fd = t->buffer->target_node->accept_fds;
2467	if (!target_allows_fd) {
2468		binder_user_error("%d:%d got %s with fd, %d, but target does not allow fds\n",
2469				  proc->pid, thread->pid,
2470				  in_reply_to ? "reply" : "transaction",
2471				  fd);
2472		ret = -EPERM;
2473		goto err_fd_not_accepted;
2474	}
2475
2476	file = fget(fd);
2477	if (!file) {
2478		binder_user_error("%d:%d got transaction with invalid fd, %d\n",
2479				  proc->pid, thread->pid, fd);
2480		ret = -EBADF;
2481		goto err_fget;
2482	}
2483	ret = security_binder_transfer_file(proc->tsk, target_proc->tsk, file);
2484	if (ret < 0) {
2485		ret = -EPERM;
2486		goto err_security;
2487	}
2488
2489	target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
2490	if (target_fd < 0) {
 
 
 
 
 
2491		ret = -ENOMEM;
2492		goto err_get_unused_fd;
2493	}
2494	task_fd_install(target_proc, target_fd, file);
2495	trace_binder_transaction_fd(t, fd, target_fd);
2496	binder_debug(BINDER_DEBUG_TRANSACTION, "        fd %d -> %d\n",
2497		     fd, target_fd);
 
2498
2499	return target_fd;
2500
2501err_get_unused_fd:
2502err_security:
2503	fput(file);
2504err_fget:
2505err_fd_not_accepted:
2506	return ret;
2507}
2508
2509static int binder_translate_fd_array(struct binder_fd_array_object *fda,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2510				     struct binder_buffer_object *parent,
 
2511				     struct binder_transaction *t,
2512				     struct binder_thread *thread,
2513				     struct binder_transaction *in_reply_to)
2514{
2515	binder_size_t fdi, fd_buf_size, num_installed_fds;
2516	int target_fd;
2517	uintptr_t parent_buffer;
2518	u32 *fd_array;
2519	struct binder_proc *proc = thread->proc;
2520	struct binder_proc *target_proc = t->to_proc;
 
 
 
2521
2522	fd_buf_size = sizeof(u32) * fda->num_fds;
2523	if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
2524		binder_user_error("%d:%d got transaction with invalid number of fds (%lld)\n",
2525				  proc->pid, thread->pid, (u64)fda->num_fds);
2526		return -EINVAL;
2527	}
2528	if (fd_buf_size > parent->length ||
2529	    fda->parent_offset > parent->length - fd_buf_size) {
2530		/* No space for all file descriptors here. */
2531		binder_user_error("%d:%d not enough space to store %lld fds in buffer\n",
2532				  proc->pid, thread->pid, (u64)fda->num_fds);
2533		return -EINVAL;
2534	}
2535	/*
2536	 * Since the parent was already fixed up, convert it
2537	 * back to the kernel address space to access it
 
 
 
2538	 */
2539	parent_buffer = parent->buffer -
2540		binder_alloc_get_user_buffer_offset(&target_proc->alloc);
2541	fd_array = (u32 *)(parent_buffer + (uintptr_t)fda->parent_offset);
2542	if (!IS_ALIGNED((unsigned long)fd_array, sizeof(u32))) {
 
 
 
2543		binder_user_error("%d:%d parent offset not aligned correctly.\n",
2544				  proc->pid, thread->pid);
2545		return -EINVAL;
2546	}
 
 
 
 
2547	for (fdi = 0; fdi < fda->num_fds; fdi++) {
2548		target_fd = binder_translate_fd(fd_array[fdi], t, thread,
2549						in_reply_to);
2550		if (target_fd < 0)
2551			goto err_translate_fd_failed;
2552		fd_array[fdi] = target_fd;
 
 
 
 
 
2553	}
2554	return 0;
2555
2556err_translate_fd_failed:
2557	/*
2558	 * Failed to allocate fd or security error, free fds
2559	 * installed so far.
2560	 */
2561	num_installed_fds = fdi;
2562	for (fdi = 0; fdi < num_installed_fds; fdi++)
2563		task_close_fd(target_proc, fd_array[fdi]);
2564	return target_fd;
2565}
2566
2567static int binder_fixup_parent(struct binder_transaction *t,
 
2568			       struct binder_thread *thread,
2569			       struct binder_buffer_object *bp,
2570			       binder_size_t *off_start,
2571			       binder_size_t num_valid,
2572			       struct binder_buffer_object *last_fixup_obj,
2573			       binder_size_t last_fixup_min_off)
2574{
2575	struct binder_buffer_object *parent;
2576	u8 *parent_buffer;
2577	struct binder_buffer *b = t->buffer;
2578	struct binder_proc *proc = thread->proc;
2579	struct binder_proc *target_proc = t->to_proc;
 
 
 
2580
2581	if (!(bp->flags & BINDER_BUFFER_FLAG_HAS_PARENT))
2582		return 0;
2583
2584	parent = binder_validate_ptr(b, bp->parent, off_start, num_valid);
 
 
2585	if (!parent) {
2586		binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
2587				  proc->pid, thread->pid);
2588		return -EINVAL;
2589	}
2590
2591	if (!binder_validate_fixup(b, off_start,
2592				   parent, bp->parent_offset,
2593				   last_fixup_obj,
2594				   last_fixup_min_off)) {
2595		binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
2596				  proc->pid, thread->pid);
2597		return -EINVAL;
2598	}
2599
2600	if (parent->length < sizeof(binder_uintptr_t) ||
2601	    bp->parent_offset > parent->length - sizeof(binder_uintptr_t)) {
2602		/* No space for a pointer here! */
2603		binder_user_error("%d:%d got transaction with invalid parent offset\n",
2604				  proc->pid, thread->pid);
2605		return -EINVAL;
2606	}
2607	parent_buffer = (u8 *)((uintptr_t)parent->buffer -
2608			binder_alloc_get_user_buffer_offset(
2609				&target_proc->alloc));
2610	*(binder_uintptr_t *)(parent_buffer + bp->parent_offset) = bp->buffer;
2611
2612	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2613}
2614
2615/**
2616 * binder_proc_transaction() - sends a transaction to a process and wakes it up
2617 * @t:		transaction to send
2618 * @proc:	process to send the transaction to
2619 * @thread:	thread in @proc to send the transaction to (may be NULL)
2620 *
2621 * This function queues a transaction to the specified process. It will try
2622 * to find a thread in the target process to handle the transaction and
2623 * wake it up. If no thread is found, the work is queued to the proc
2624 * waitqueue.
2625 *
2626 * If the @thread parameter is not NULL, the transaction is always queued
2627 * to the waitlist of that specific thread.
2628 *
2629 * Return:	true if the transactions was successfully queued
2630 *		false if the target process or thread is dead
 
 
 
 
2631 */
2632static bool binder_proc_transaction(struct binder_transaction *t,
2633				    struct binder_proc *proc,
2634				    struct binder_thread *thread)
2635{
2636	struct binder_node *node = t->buffer->target_node;
2637	bool oneway = !!(t->flags & TF_ONE_WAY);
2638	bool pending_async = false;
 
 
2639
2640	BUG_ON(!node);
2641	binder_node_lock(node);
2642	if (oneway) {
2643		BUG_ON(thread);
2644		if (node->has_async_transaction) {
2645			pending_async = true;
2646		} else {
2647			node->has_async_transaction = true;
2648		}
2649	}
2650
2651	binder_inner_proc_lock(proc);
 
 
 
 
 
2652
2653	if (proc->is_dead || (thread && thread->is_dead)) {
 
2654		binder_inner_proc_unlock(proc);
2655		binder_node_unlock(node);
2656		return false;
2657	}
2658
2659	if (!thread && !pending_async)
2660		thread = binder_select_thread_ilocked(proc);
2661
2662	if (thread)
2663		binder_enqueue_thread_work_ilocked(thread, &t->work);
2664	else if (!pending_async)
2665		binder_enqueue_work_ilocked(&t->work, &proc->todo);
2666	else
 
 
 
 
 
 
 
 
 
 
 
2667		binder_enqueue_work_ilocked(&t->work, &node->async_todo);
 
2668
2669	if (!pending_async)
2670		binder_wakeup_thread_ilocked(proc, thread, !oneway /* sync */);
2671
 
2672	binder_inner_proc_unlock(proc);
2673	binder_node_unlock(node);
2674
2675	return true;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2676}
2677
2678/**
2679 * binder_get_node_refs_for_txn() - Get required refs on node for txn
2680 * @node:         struct binder_node for which to get refs
2681 * @proc:         returns @node->proc if valid
2682 * @error:        if no @proc then returns BR_DEAD_REPLY
2683 *
2684 * User-space normally keeps the node alive when creating a transaction
2685 * since it has a reference to the target. The local strong ref keeps it
2686 * alive if the sending process dies before the target process processes
2687 * the transaction. If the source process is malicious or has a reference
2688 * counting bug, relying on the local strong ref can fail.
2689 *
2690 * Since user-space can cause the local strong ref to go away, we also take
2691 * a tmpref on the node to ensure it survives while we are constructing
2692 * the transaction. We also need a tmpref on the proc while we are
2693 * constructing the transaction, so we take that here as well.
2694 *
2695 * Return: The target_node with refs taken or NULL if no @node->proc is NULL.
2696 * Also sets @proc if valid. If the @node->proc is NULL indicating that the
2697 * target proc has died, @error is set to BR_DEAD_REPLY
2698 */
2699static struct binder_node *binder_get_node_refs_for_txn(
2700		struct binder_node *node,
2701		struct binder_proc **procp,
2702		uint32_t *error)
2703{
2704	struct binder_node *target_node = NULL;
2705
2706	binder_node_inner_lock(node);
2707	if (node->proc) {
2708		target_node = node;
2709		binder_inc_node_nilocked(node, 1, 0, NULL);
2710		binder_inc_node_tmpref_ilocked(node);
2711		node->proc->tmp_ref++;
2712		*procp = node->proc;
2713	} else
2714		*error = BR_DEAD_REPLY;
2715	binder_node_inner_unlock(node);
2716
2717	return target_node;
2718}
2719
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2720static void binder_transaction(struct binder_proc *proc,
2721			       struct binder_thread *thread,
2722			       struct binder_transaction_data *tr, int reply,
2723			       binder_size_t extra_buffers_size)
2724{
2725	int ret;
2726	struct binder_transaction *t;
 
2727	struct binder_work *tcomplete;
2728	binder_size_t *offp, *off_end, *off_start;
 
2729	binder_size_t off_min;
2730	u8 *sg_bufp, *sg_buf_end;
 
2731	struct binder_proc *target_proc = NULL;
2732	struct binder_thread *target_thread = NULL;
2733	struct binder_node *target_node = NULL;
2734	struct binder_transaction *in_reply_to = NULL;
2735	struct binder_transaction_log_entry *e;
2736	uint32_t return_error = 0;
2737	uint32_t return_error_param = 0;
2738	uint32_t return_error_line = 0;
2739	struct binder_buffer_object *last_fixup_obj = NULL;
2740	binder_size_t last_fixup_min_off = 0;
2741	struct binder_context *context = proc->context;
2742	int t_debug_id = atomic_inc_return(&binder_last_id);
 
 
 
 
 
 
 
 
 
2743
2744	e = binder_transaction_log_add(&binder_transaction_log);
2745	e->debug_id = t_debug_id;
2746	e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
2747	e->from_proc = proc->pid;
2748	e->from_thread = thread->pid;
2749	e->target_handle = tr->target.handle;
2750	e->data_size = tr->data_size;
2751	e->offsets_size = tr->offsets_size;
2752	e->context_name = proc->context->name;
 
 
 
 
2753
2754	if (reply) {
2755		binder_inner_proc_lock(proc);
2756		in_reply_to = thread->transaction_stack;
2757		if (in_reply_to == NULL) {
2758			binder_inner_proc_unlock(proc);
2759			binder_user_error("%d:%d got reply transaction with no transaction stack\n",
2760					  proc->pid, thread->pid);
2761			return_error = BR_FAILED_REPLY;
2762			return_error_param = -EPROTO;
2763			return_error_line = __LINE__;
2764			goto err_empty_call_stack;
2765		}
2766		if (in_reply_to->to_thread != thread) {
2767			spin_lock(&in_reply_to->lock);
2768			binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
2769				proc->pid, thread->pid, in_reply_to->debug_id,
2770				in_reply_to->to_proc ?
2771				in_reply_to->to_proc->pid : 0,
2772				in_reply_to->to_thread ?
2773				in_reply_to->to_thread->pid : 0);
2774			spin_unlock(&in_reply_to->lock);
2775			binder_inner_proc_unlock(proc);
2776			return_error = BR_FAILED_REPLY;
2777			return_error_param = -EPROTO;
2778			return_error_line = __LINE__;
2779			in_reply_to = NULL;
2780			goto err_bad_call_stack;
2781		}
2782		thread->transaction_stack = in_reply_to->to_parent;
2783		binder_inner_proc_unlock(proc);
2784		binder_set_nice(in_reply_to->saved_priority);
2785		target_thread = binder_get_txn_from_and_acq_inner(in_reply_to);
2786		if (target_thread == NULL) {
 
 
 
 
2787			return_error = BR_DEAD_REPLY;
2788			return_error_line = __LINE__;
2789			goto err_dead_binder;
2790		}
2791		if (target_thread->transaction_stack != in_reply_to) {
2792			binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
2793				proc->pid, thread->pid,
2794				target_thread->transaction_stack ?
2795				target_thread->transaction_stack->debug_id : 0,
2796				in_reply_to->debug_id);
2797			binder_inner_proc_unlock(target_thread->proc);
2798			return_error = BR_FAILED_REPLY;
2799			return_error_param = -EPROTO;
2800			return_error_line = __LINE__;
2801			in_reply_to = NULL;
2802			target_thread = NULL;
2803			goto err_dead_binder;
2804		}
2805		target_proc = target_thread->proc;
2806		target_proc->tmp_ref++;
2807		binder_inner_proc_unlock(target_thread->proc);
2808	} else {
2809		if (tr->target.handle) {
2810			struct binder_ref *ref;
2811
2812			/*
2813			 * There must already be a strong ref
2814			 * on this node. If so, do a strong
2815			 * increment on the node to ensure it
2816			 * stays alive until the transaction is
2817			 * done.
2818			 */
2819			binder_proc_lock(proc);
2820			ref = binder_get_ref_olocked(proc, tr->target.handle,
2821						     true);
2822			if (ref) {
2823				target_node = binder_get_node_refs_for_txn(
2824						ref->node, &target_proc,
2825						&return_error);
2826			} else {
2827				binder_user_error("%d:%d got transaction to invalid handle\n",
2828						  proc->pid, thread->pid);
2829				return_error = BR_FAILED_REPLY;
2830			}
2831			binder_proc_unlock(proc);
2832		} else {
2833			mutex_lock(&context->context_mgr_node_lock);
2834			target_node = context->binder_context_mgr_node;
2835			if (target_node)
2836				target_node = binder_get_node_refs_for_txn(
2837						target_node, &target_proc,
2838						&return_error);
2839			else
2840				return_error = BR_DEAD_REPLY;
2841			mutex_unlock(&context->context_mgr_node_lock);
2842			if (target_node && target_proc == proc) {
2843				binder_user_error("%d:%d got transaction to context manager from process owning it\n",
2844						  proc->pid, thread->pid);
2845				return_error = BR_FAILED_REPLY;
2846				return_error_param = -EINVAL;
2847				return_error_line = __LINE__;
2848				goto err_invalid_target_handle;
2849			}
2850		}
2851		if (!target_node) {
 
 
2852			/*
2853			 * return_error is set above
2854			 */
2855			return_error_param = -EINVAL;
2856			return_error_line = __LINE__;
2857			goto err_dead_binder;
2858		}
2859		e->to_node = target_node->debug_id;
2860		if (security_binder_transaction(proc->tsk,
2861						target_proc->tsk) < 0) {
 
 
 
 
 
 
 
 
 
 
2862			return_error = BR_FAILED_REPLY;
2863			return_error_param = -EPERM;
2864			return_error_line = __LINE__;
2865			goto err_invalid_target_handle;
2866		}
2867		binder_inner_proc_lock(proc);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2868		if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
2869			struct binder_transaction *tmp;
2870
2871			tmp = thread->transaction_stack;
2872			if (tmp->to_thread != thread) {
2873				spin_lock(&tmp->lock);
2874				binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
2875					proc->pid, thread->pid, tmp->debug_id,
2876					tmp->to_proc ? tmp->to_proc->pid : 0,
2877					tmp->to_thread ?
2878					tmp->to_thread->pid : 0);
2879				spin_unlock(&tmp->lock);
2880				binder_inner_proc_unlock(proc);
2881				return_error = BR_FAILED_REPLY;
2882				return_error_param = -EPROTO;
2883				return_error_line = __LINE__;
2884				goto err_bad_call_stack;
2885			}
2886			while (tmp) {
2887				struct binder_thread *from;
2888
2889				spin_lock(&tmp->lock);
2890				from = tmp->from;
2891				if (from && from->proc == target_proc) {
2892					atomic_inc(&from->tmp_ref);
2893					target_thread = from;
2894					spin_unlock(&tmp->lock);
2895					break;
2896				}
2897				spin_unlock(&tmp->lock);
2898				tmp = tmp->from_parent;
2899			}
2900		}
2901		binder_inner_proc_unlock(proc);
2902	}
2903	if (target_thread)
2904		e->to_thread = target_thread->pid;
2905	e->to_proc = target_proc->pid;
2906
2907	/* TODO: reuse incoming transaction for reply */
2908	t = kzalloc(sizeof(*t), GFP_KERNEL);
2909	if (t == NULL) {
 
 
2910		return_error = BR_FAILED_REPLY;
2911		return_error_param = -ENOMEM;
2912		return_error_line = __LINE__;
2913		goto err_alloc_t_failed;
2914	}
 
2915	binder_stats_created(BINDER_STAT_TRANSACTION);
2916	spin_lock_init(&t->lock);
2917
2918	tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
2919	if (tcomplete == NULL) {
 
 
2920		return_error = BR_FAILED_REPLY;
2921		return_error_param = -ENOMEM;
2922		return_error_line = __LINE__;
2923		goto err_alloc_tcomplete_failed;
2924	}
2925	binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
2926
2927	t->debug_id = t_debug_id;
 
2928
2929	if (reply)
2930		binder_debug(BINDER_DEBUG_TRANSACTION,
2931			     "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld-%lld\n",
2932			     proc->pid, thread->pid, t->debug_id,
2933			     target_proc->pid, target_thread->pid,
2934			     (u64)tr->data.ptr.buffer,
2935			     (u64)tr->data.ptr.offsets,
2936			     (u64)tr->data_size, (u64)tr->offsets_size,
2937			     (u64)extra_buffers_size);
2938	else
2939		binder_debug(BINDER_DEBUG_TRANSACTION,
2940			     "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld-%lld\n",
2941			     proc->pid, thread->pid, t->debug_id,
2942			     target_proc->pid, target_node->debug_id,
2943			     (u64)tr->data.ptr.buffer,
2944			     (u64)tr->data.ptr.offsets,
2945			     (u64)tr->data_size, (u64)tr->offsets_size,
2946			     (u64)extra_buffers_size);
2947
2948	if (!reply && !(tr->flags & TF_ONE_WAY))
2949		t->from = thread;
2950	else
2951		t->from = NULL;
 
 
2952	t->sender_euid = task_euid(proc->tsk);
2953	t->to_proc = target_proc;
2954	t->to_thread = target_thread;
2955	t->code = tr->code;
2956	t->flags = tr->flags;
2957	t->priority = task_nice(current);
2958
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2959	trace_binder_transaction(reply, t, target_node);
2960
2961	t->buffer = binder_alloc_new_buf(&target_proc->alloc, tr->data_size,
2962		tr->offsets_size, extra_buffers_size,
2963		!reply && (t->flags & TF_ONE_WAY));
2964	if (IS_ERR(t->buffer)) {
2965		/*
2966		 * -ESRCH indicates VMA cleared. The target is dying.
2967		 */
 
 
 
 
 
 
2968		return_error_param = PTR_ERR(t->buffer);
2969		return_error = return_error_param == -ESRCH ?
2970			BR_DEAD_REPLY : BR_FAILED_REPLY;
2971		return_error_line = __LINE__;
2972		t->buffer = NULL;
2973		goto err_binder_alloc_buf_failed;
2974	}
2975	t->buffer->allow_user_free = 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2976	t->buffer->debug_id = t->debug_id;
2977	t->buffer->transaction = t;
2978	t->buffer->target_node = target_node;
 
2979	trace_binder_transaction_alloc_buf(t->buffer);
2980	off_start = (binder_size_t *)(t->buffer->data +
2981				      ALIGN(tr->data_size, sizeof(void *)));
2982	offp = off_start;
2983
2984	if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
2985			   tr->data.ptr.buffer, tr->data_size)) {
2986		binder_user_error("%d:%d got transaction with invalid data ptr\n",
2987				proc->pid, thread->pid);
2988		return_error = BR_FAILED_REPLY;
2989		return_error_param = -EFAULT;
2990		return_error_line = __LINE__;
2991		goto err_copy_data_failed;
2992	}
2993	if (copy_from_user(offp, (const void __user *)(uintptr_t)
2994			   tr->data.ptr.offsets, tr->offsets_size)) {
2995		binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
2996				proc->pid, thread->pid);
2997		return_error = BR_FAILED_REPLY;
2998		return_error_param = -EFAULT;
2999		return_error_line = __LINE__;
3000		goto err_copy_data_failed;
3001	}
3002	if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
3003		binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
3004				proc->pid, thread->pid, (u64)tr->offsets_size);
3005		return_error = BR_FAILED_REPLY;
3006		return_error_param = -EINVAL;
3007		return_error_line = __LINE__;
3008		goto err_bad_offset;
3009	}
3010	if (!IS_ALIGNED(extra_buffers_size, sizeof(u64))) {
3011		binder_user_error("%d:%d got transaction with unaligned buffers size, %lld\n",
3012				  proc->pid, thread->pid,
3013				  (u64)extra_buffers_size);
3014		return_error = BR_FAILED_REPLY;
3015		return_error_param = -EINVAL;
3016		return_error_line = __LINE__;
3017		goto err_bad_offset;
3018	}
3019	off_end = (void *)off_start + tr->offsets_size;
3020	sg_bufp = (u8 *)(PTR_ALIGN(off_end, sizeof(void *)));
3021	sg_buf_end = sg_bufp + extra_buffers_size;
 
 
 
3022	off_min = 0;
3023	for (; offp < off_end; offp++) {
 
3024		struct binder_object_header *hdr;
3025		size_t object_size = binder_validate_object(t->buffer, *offp);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3026
3027		if (object_size == 0 || *offp < off_min) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3028			binder_user_error("%d:%d got transaction with invalid offset (%lld, min %lld max %lld) or object.\n",
3029					  proc->pid, thread->pid, (u64)*offp,
 
3030					  (u64)off_min,
3031					  (u64)t->buffer->data_size);
3032			return_error = BR_FAILED_REPLY;
3033			return_error_param = -EINVAL;
3034			return_error_line = __LINE__;
3035			goto err_bad_offset;
3036		}
 
 
 
 
 
3037
3038		hdr = (struct binder_object_header *)(t->buffer->data + *offp);
3039		off_min = *offp + object_size;
3040		switch (hdr->type) {
3041		case BINDER_TYPE_BINDER:
3042		case BINDER_TYPE_WEAK_BINDER: {
3043			struct flat_binder_object *fp;
3044
3045			fp = to_flat_binder_object(hdr);
3046			ret = binder_translate_binder(fp, t, thread);
3047			if (ret < 0) {
 
 
 
 
 
 
 
3048				return_error = BR_FAILED_REPLY;
3049				return_error_param = ret;
3050				return_error_line = __LINE__;
3051				goto err_translate_failed;
3052			}
3053		} break;
3054		case BINDER_TYPE_HANDLE:
3055		case BINDER_TYPE_WEAK_HANDLE: {
3056			struct flat_binder_object *fp;
3057
3058			fp = to_flat_binder_object(hdr);
3059			ret = binder_translate_handle(fp, t, thread);
3060			if (ret < 0) {
 
 
 
 
 
 
3061				return_error = BR_FAILED_REPLY;
3062				return_error_param = ret;
3063				return_error_line = __LINE__;
3064				goto err_translate_failed;
3065			}
3066		} break;
3067
3068		case BINDER_TYPE_FD: {
3069			struct binder_fd_object *fp = to_binder_fd_object(hdr);
3070			int target_fd = binder_translate_fd(fp->fd, t, thread,
3071							    in_reply_to);
 
 
3072
3073			if (target_fd < 0) {
 
 
 
 
 
 
 
3074				return_error = BR_FAILED_REPLY;
3075				return_error_param = target_fd;
3076				return_error_line = __LINE__;
3077				goto err_translate_failed;
3078			}
3079			fp->pad_binder = 0;
3080			fp->fd = target_fd;
3081		} break;
3082		case BINDER_TYPE_FDA: {
 
 
 
 
3083			struct binder_fd_array_object *fda =
3084				to_binder_fd_array_object(hdr);
 
 
3085			struct binder_buffer_object *parent =
3086				binder_validate_ptr(t->buffer, fda->parent,
3087						    off_start,
3088						    offp - off_start);
 
 
3089			if (!parent) {
3090				binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
3091						  proc->pid, thread->pid);
3092				return_error = BR_FAILED_REPLY;
3093				return_error_param = -EINVAL;
3094				return_error_line = __LINE__;
3095				goto err_bad_parent;
3096			}
3097			if (!binder_validate_fixup(t->buffer, off_start,
3098						   parent, fda->parent_offset,
3099						   last_fixup_obj,
 
 
3100						   last_fixup_min_off)) {
3101				binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
3102						  proc->pid, thread->pid);
3103				return_error = BR_FAILED_REPLY;
3104				return_error_param = -EINVAL;
3105				return_error_line = __LINE__;
3106				goto err_bad_parent;
3107			}
3108			ret = binder_translate_fd_array(fda, parent, t, thread,
3109							in_reply_to);
3110			if (ret < 0) {
 
 
 
 
 
 
 
 
 
3111				return_error = BR_FAILED_REPLY;
3112				return_error_param = ret;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3113				return_error_line = __LINE__;
3114				goto err_translate_failed;
3115			}
3116			last_fixup_obj = parent;
3117			last_fixup_min_off =
3118				fda->parent_offset + sizeof(u32) * fda->num_fds;
3119		} break;
3120		case BINDER_TYPE_PTR: {
3121			struct binder_buffer_object *bp =
3122				to_binder_buffer_object(hdr);
3123			size_t buf_left = sg_buf_end - sg_bufp;
 
3124
3125			if (bp->length > buf_left) {
3126				binder_user_error("%d:%d got transaction with too large buffer\n",
3127						  proc->pid, thread->pid);
3128				return_error = BR_FAILED_REPLY;
3129				return_error_param = -EINVAL;
3130				return_error_line = __LINE__;
3131				goto err_bad_offset;
3132			}
3133			if (copy_from_user(sg_bufp,
3134					   (const void __user *)(uintptr_t)
3135					   bp->buffer, bp->length)) {
3136				binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
3137						  proc->pid, thread->pid);
3138				return_error_param = -EFAULT;
3139				return_error = BR_FAILED_REPLY;
 
3140				return_error_line = __LINE__;
3141				goto err_copy_data_failed;
3142			}
3143			/* Fixup buffer pointer to target proc address space */
3144			bp->buffer = (uintptr_t)sg_bufp +
3145				binder_alloc_get_user_buffer_offset(
3146						&target_proc->alloc);
3147			sg_bufp += ALIGN(bp->length, sizeof(u64));
3148
3149			ret = binder_fixup_parent(t, thread, bp, off_start,
3150						  offp - off_start,
3151						  last_fixup_obj,
 
 
3152						  last_fixup_min_off);
3153			if (ret < 0) {
 
 
 
 
 
 
3154				return_error = BR_FAILED_REPLY;
3155				return_error_param = ret;
3156				return_error_line = __LINE__;
3157				goto err_translate_failed;
3158			}
3159			last_fixup_obj = bp;
3160			last_fixup_min_off = 0;
3161		} break;
3162		default:
3163			binder_user_error("%d:%d got transaction with invalid object type, %x\n",
3164				proc->pid, thread->pid, hdr->type);
3165			return_error = BR_FAILED_REPLY;
3166			return_error_param = -EINVAL;
3167			return_error_line = __LINE__;
3168			goto err_bad_object_type;
3169		}
3170	}
3171	tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3172	t->work.type = BINDER_WORK_TRANSACTION;
3173
3174	if (reply) {
3175		binder_enqueue_thread_work(thread, tcomplete);
3176		binder_inner_proc_lock(target_proc);
3177		if (target_thread->is_dead) {
 
3178			binder_inner_proc_unlock(target_proc);
3179			goto err_dead_proc_or_thread;
3180		}
3181		BUG_ON(t->buffer->async_transaction != 0);
3182		binder_pop_transaction_ilocked(target_thread, in_reply_to);
3183		binder_enqueue_thread_work_ilocked(target_thread, &t->work);
 
3184		binder_inner_proc_unlock(target_proc);
3185		wake_up_interruptible_sync(&target_thread->wait);
3186		binder_free_transaction(in_reply_to);
3187	} else if (!(t->flags & TF_ONE_WAY)) {
3188		BUG_ON(t->buffer->async_transaction != 0);
3189		binder_inner_proc_lock(proc);
3190		/*
3191		 * Defer the TRANSACTION_COMPLETE, so we don't return to
3192		 * userspace immediately; this allows the target process to
3193		 * immediately start processing this transaction, reducing
3194		 * latency. We will then return the TRANSACTION_COMPLETE when
3195		 * the target replies (or there is an error).
3196		 */
3197		binder_enqueue_deferred_thread_work_ilocked(thread, tcomplete);
3198		t->need_reply = 1;
3199		t->from_parent = thread->transaction_stack;
3200		thread->transaction_stack = t;
3201		binder_inner_proc_unlock(proc);
3202		if (!binder_proc_transaction(t, target_proc, target_thread)) {
 
 
3203			binder_inner_proc_lock(proc);
3204			binder_pop_transaction_ilocked(thread, t);
3205			binder_inner_proc_unlock(proc);
3206			goto err_dead_proc_or_thread;
3207		}
3208	} else {
3209		BUG_ON(target_node == NULL);
3210		BUG_ON(t->buffer->async_transaction != 1);
 
 
 
 
 
 
 
 
3211		binder_enqueue_thread_work(thread, tcomplete);
3212		if (!binder_proc_transaction(t, target_proc, NULL))
 
3213			goto err_dead_proc_or_thread;
3214	}
3215	if (target_thread)
3216		binder_thread_dec_tmpref(target_thread);
3217	binder_proc_dec_tmpref(target_proc);
3218	if (target_node)
3219		binder_dec_node_tmpref(target_node);
3220	/*
3221	 * write barrier to synchronize with initialization
3222	 * of log entry
3223	 */
3224	smp_wmb();
3225	WRITE_ONCE(e->debug_id_done, t_debug_id);
3226	return;
3227
3228err_dead_proc_or_thread:
3229	return_error = BR_DEAD_REPLY;
 
3230	return_error_line = __LINE__;
3231	binder_dequeue_work(proc, tcomplete);
3232err_translate_failed:
3233err_bad_object_type:
3234err_bad_offset:
3235err_bad_parent:
3236err_copy_data_failed:
 
 
3237	trace_binder_transaction_failed_buffer_release(t->buffer);
3238	binder_transaction_buffer_release(target_proc, t->buffer, offp);
 
3239	if (target_node)
3240		binder_dec_node_tmpref(target_node);
3241	target_node = NULL;
3242	t->buffer->transaction = NULL;
3243	binder_alloc_free_buf(&target_proc->alloc, t->buffer);
3244err_binder_alloc_buf_failed:
 
 
 
 
3245	kfree(tcomplete);
3246	binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
3247err_alloc_tcomplete_failed:
 
 
3248	kfree(t);
3249	binder_stats_deleted(BINDER_STAT_TRANSACTION);
3250err_alloc_t_failed:
 
3251err_bad_call_stack:
3252err_empty_call_stack:
3253err_dead_binder:
3254err_invalid_target_handle:
3255	if (target_thread)
3256		binder_thread_dec_tmpref(target_thread);
3257	if (target_proc)
3258		binder_proc_dec_tmpref(target_proc);
3259	if (target_node) {
3260		binder_dec_node(target_node, 1, 0);
3261		binder_dec_node_tmpref(target_node);
3262	}
3263
3264	binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
3265		     "%d:%d transaction failed %d/%d, size %lld-%lld line %d\n",
3266		     proc->pid, thread->pid, return_error, return_error_param,
 
 
 
 
3267		     (u64)tr->data_size, (u64)tr->offsets_size,
3268		     return_error_line);
3269
 
 
 
 
 
3270	{
3271		struct binder_transaction_log_entry *fe;
3272
3273		e->return_error = return_error;
3274		e->return_error_param = return_error_param;
3275		e->return_error_line = return_error_line;
3276		fe = binder_transaction_log_add(&binder_transaction_log_failed);
3277		*fe = *e;
3278		/*
3279		 * write barrier to synchronize with initialization
3280		 * of log entry
3281		 */
3282		smp_wmb();
3283		WRITE_ONCE(e->debug_id_done, t_debug_id);
3284		WRITE_ONCE(fe->debug_id_done, t_debug_id);
3285	}
3286
3287	BUG_ON(thread->return_error.cmd != BR_OK);
3288	if (in_reply_to) {
 
 
3289		thread->return_error.cmd = BR_TRANSACTION_COMPLETE;
3290		binder_enqueue_thread_work(thread, &thread->return_error.work);
3291		binder_send_failed_reply(in_reply_to, return_error);
3292	} else {
 
 
 
 
3293		thread->return_error.cmd = return_error;
3294		binder_enqueue_thread_work(thread, &thread->return_error.work);
3295	}
3296}
3297
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3298static int binder_thread_write(struct binder_proc *proc,
3299			struct binder_thread *thread,
3300			binder_uintptr_t binder_buffer, size_t size,
3301			binder_size_t *consumed)
3302{
3303	uint32_t cmd;
3304	struct binder_context *context = proc->context;
3305	void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
3306	void __user *ptr = buffer + *consumed;
3307	void __user *end = buffer + size;
3308
3309	while (ptr < end && thread->return_error.cmd == BR_OK) {
3310		int ret;
3311
3312		if (get_user(cmd, (uint32_t __user *)ptr))
3313			return -EFAULT;
3314		ptr += sizeof(uint32_t);
3315		trace_binder_command(cmd);
3316		if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
3317			atomic_inc(&binder_stats.bc[_IOC_NR(cmd)]);
3318			atomic_inc(&proc->stats.bc[_IOC_NR(cmd)]);
3319			atomic_inc(&thread->stats.bc[_IOC_NR(cmd)]);
3320		}
3321		switch (cmd) {
3322		case BC_INCREFS:
3323		case BC_ACQUIRE:
3324		case BC_RELEASE:
3325		case BC_DECREFS: {
3326			uint32_t target;
3327			const char *debug_string;
3328			bool strong = cmd == BC_ACQUIRE || cmd == BC_RELEASE;
3329			bool increment = cmd == BC_INCREFS || cmd == BC_ACQUIRE;
3330			struct binder_ref_data rdata;
3331
3332			if (get_user(target, (uint32_t __user *)ptr))
3333				return -EFAULT;
3334
3335			ptr += sizeof(uint32_t);
3336			ret = -1;
3337			if (increment && !target) {
3338				struct binder_node *ctx_mgr_node;
 
3339				mutex_lock(&context->context_mgr_node_lock);
3340				ctx_mgr_node = context->binder_context_mgr_node;
3341				if (ctx_mgr_node)
 
 
 
 
 
 
3342					ret = binder_inc_ref_for_node(
3343							proc, ctx_mgr_node,
3344							strong, NULL, &rdata);
 
3345				mutex_unlock(&context->context_mgr_node_lock);
3346			}
3347			if (ret)
3348				ret = binder_update_ref_for_handle(
3349						proc, target, increment, strong,
3350						&rdata);
3351			if (!ret && rdata.desc != target) {
3352				binder_user_error("%d:%d tried to acquire reference to desc %d, got %d instead\n",
3353					proc->pid, thread->pid,
3354					target, rdata.desc);
3355			}
3356			switch (cmd) {
3357			case BC_INCREFS:
3358				debug_string = "IncRefs";
3359				break;
3360			case BC_ACQUIRE:
3361				debug_string = "Acquire";
3362				break;
3363			case BC_RELEASE:
3364				debug_string = "Release";
3365				break;
3366			case BC_DECREFS:
3367			default:
3368				debug_string = "DecRefs";
3369				break;
3370			}
3371			if (ret) {
3372				binder_user_error("%d:%d %s %d refcount change on invalid ref %d ret %d\n",
3373					proc->pid, thread->pid, debug_string,
3374					strong, target, ret);
3375				break;
3376			}
3377			binder_debug(BINDER_DEBUG_USER_REFS,
3378				     "%d:%d %s ref %d desc %d s %d w %d\n",
3379				     proc->pid, thread->pid, debug_string,
3380				     rdata.debug_id, rdata.desc, rdata.strong,
3381				     rdata.weak);
3382			break;
3383		}
3384		case BC_INCREFS_DONE:
3385		case BC_ACQUIRE_DONE: {
3386			binder_uintptr_t node_ptr;
3387			binder_uintptr_t cookie;
3388			struct binder_node *node;
3389			bool free_node;
3390
3391			if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
3392				return -EFAULT;
3393			ptr += sizeof(binder_uintptr_t);
3394			if (get_user(cookie, (binder_uintptr_t __user *)ptr))
3395				return -EFAULT;
3396			ptr += sizeof(binder_uintptr_t);
3397			node = binder_get_node(proc, node_ptr);
3398			if (node == NULL) {
3399				binder_user_error("%d:%d %s u%016llx no match\n",
3400					proc->pid, thread->pid,
3401					cmd == BC_INCREFS_DONE ?
3402					"BC_INCREFS_DONE" :
3403					"BC_ACQUIRE_DONE",
3404					(u64)node_ptr);
3405				break;
3406			}
3407			if (cookie != node->cookie) {
3408				binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
3409					proc->pid, thread->pid,
3410					cmd == BC_INCREFS_DONE ?
3411					"BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
3412					(u64)node_ptr, node->debug_id,
3413					(u64)cookie, (u64)node->cookie);
3414				binder_put_node(node);
3415				break;
3416			}
3417			binder_node_inner_lock(node);
3418			if (cmd == BC_ACQUIRE_DONE) {
3419				if (node->pending_strong_ref == 0) {
3420					binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
3421						proc->pid, thread->pid,
3422						node->debug_id);
3423					binder_node_inner_unlock(node);
3424					binder_put_node(node);
3425					break;
3426				}
3427				node->pending_strong_ref = 0;
3428			} else {
3429				if (node->pending_weak_ref == 0) {
3430					binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
3431						proc->pid, thread->pid,
3432						node->debug_id);
3433					binder_node_inner_unlock(node);
3434					binder_put_node(node);
3435					break;
3436				}
3437				node->pending_weak_ref = 0;
3438			}
3439			free_node = binder_dec_node_nilocked(node,
3440					cmd == BC_ACQUIRE_DONE, 0);
3441			WARN_ON(free_node);
3442			binder_debug(BINDER_DEBUG_USER_REFS,
3443				     "%d:%d %s node %d ls %d lw %d tr %d\n",
3444				     proc->pid, thread->pid,
3445				     cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
3446				     node->debug_id, node->local_strong_refs,
3447				     node->local_weak_refs, node->tmp_refs);
3448			binder_node_inner_unlock(node);
3449			binder_put_node(node);
3450			break;
3451		}
3452		case BC_ATTEMPT_ACQUIRE:
3453			pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
3454			return -EINVAL;
3455		case BC_ACQUIRE_RESULT:
3456			pr_err("BC_ACQUIRE_RESULT not supported\n");
3457			return -EINVAL;
3458
3459		case BC_FREE_BUFFER: {
3460			binder_uintptr_t data_ptr;
3461			struct binder_buffer *buffer;
3462
3463			if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
3464				return -EFAULT;
3465			ptr += sizeof(binder_uintptr_t);
3466
3467			buffer = binder_alloc_prepare_to_free(&proc->alloc,
3468							      data_ptr);
3469			if (buffer == NULL) {
3470				binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
3471					proc->pid, thread->pid, (u64)data_ptr);
3472				break;
3473			}
3474			if (!buffer->allow_user_free) {
3475				binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
3476					proc->pid, thread->pid, (u64)data_ptr);
 
 
 
 
3477				break;
3478			}
3479			binder_debug(BINDER_DEBUG_FREE_BUFFER,
3480				     "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
3481				     proc->pid, thread->pid, (u64)data_ptr,
3482				     buffer->debug_id,
3483				     buffer->transaction ? "active" : "finished");
3484
3485			if (buffer->transaction) {
3486				buffer->transaction->buffer = NULL;
3487				buffer->transaction = NULL;
3488			}
3489			if (buffer->async_transaction && buffer->target_node) {
3490				struct binder_node *buf_node;
3491				struct binder_work *w;
3492
3493				buf_node = buffer->target_node;
3494				binder_node_inner_lock(buf_node);
3495				BUG_ON(!buf_node->has_async_transaction);
3496				BUG_ON(buf_node->proc != proc);
3497				w = binder_dequeue_work_head_ilocked(
3498						&buf_node->async_todo);
3499				if (!w) {
3500					buf_node->has_async_transaction = false;
3501				} else {
3502					binder_enqueue_work_ilocked(
3503							w, &proc->todo);
3504					binder_wakeup_proc_ilocked(proc);
3505				}
3506				binder_node_inner_unlock(buf_node);
3507			}
3508			trace_binder_transaction_buffer_release(buffer);
3509			binder_transaction_buffer_release(proc, buffer, NULL);
3510			binder_alloc_free_buf(&proc->alloc, buffer);
3511			break;
3512		}
3513
3514		case BC_TRANSACTION_SG:
3515		case BC_REPLY_SG: {
3516			struct binder_transaction_data_sg tr;
3517
3518			if (copy_from_user(&tr, ptr, sizeof(tr)))
3519				return -EFAULT;
3520			ptr += sizeof(tr);
3521			binder_transaction(proc, thread, &tr.transaction_data,
3522					   cmd == BC_REPLY_SG, tr.buffers_size);
3523			break;
3524		}
3525		case BC_TRANSACTION:
3526		case BC_REPLY: {
3527			struct binder_transaction_data tr;
3528
3529			if (copy_from_user(&tr, ptr, sizeof(tr)))
3530				return -EFAULT;
3531			ptr += sizeof(tr);
3532			binder_transaction(proc, thread, &tr,
3533					   cmd == BC_REPLY, 0);
3534			break;
3535		}
3536
3537		case BC_REGISTER_LOOPER:
3538			binder_debug(BINDER_DEBUG_THREADS,
3539				     "%d:%d BC_REGISTER_LOOPER\n",
3540				     proc->pid, thread->pid);
3541			binder_inner_proc_lock(proc);
3542			if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
3543				thread->looper |= BINDER_LOOPER_STATE_INVALID;
3544				binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
3545					proc->pid, thread->pid);
3546			} else if (proc->requested_threads == 0) {
3547				thread->looper |= BINDER_LOOPER_STATE_INVALID;
3548				binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
3549					proc->pid, thread->pid);
3550			} else {
3551				proc->requested_threads--;
3552				proc->requested_threads_started++;
3553			}
3554			thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
3555			binder_inner_proc_unlock(proc);
3556			break;
3557		case BC_ENTER_LOOPER:
3558			binder_debug(BINDER_DEBUG_THREADS,
3559				     "%d:%d BC_ENTER_LOOPER\n",
3560				     proc->pid, thread->pid);
3561			if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
3562				thread->looper |= BINDER_LOOPER_STATE_INVALID;
3563				binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
3564					proc->pid, thread->pid);
3565			}
3566			thread->looper |= BINDER_LOOPER_STATE_ENTERED;
3567			break;
3568		case BC_EXIT_LOOPER:
3569			binder_debug(BINDER_DEBUG_THREADS,
3570				     "%d:%d BC_EXIT_LOOPER\n",
3571				     proc->pid, thread->pid);
3572			thread->looper |= BINDER_LOOPER_STATE_EXITED;
3573			break;
3574
3575		case BC_REQUEST_DEATH_NOTIFICATION:
3576		case BC_CLEAR_DEATH_NOTIFICATION: {
3577			uint32_t target;
3578			binder_uintptr_t cookie;
3579			struct binder_ref *ref;
3580			struct binder_ref_death *death = NULL;
3581
3582			if (get_user(target, (uint32_t __user *)ptr))
3583				return -EFAULT;
3584			ptr += sizeof(uint32_t);
3585			if (get_user(cookie, (binder_uintptr_t __user *)ptr))
3586				return -EFAULT;
3587			ptr += sizeof(binder_uintptr_t);
3588			if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
3589				/*
3590				 * Allocate memory for death notification
3591				 * before taking lock
3592				 */
3593				death = kzalloc(sizeof(*death), GFP_KERNEL);
3594				if (death == NULL) {
3595					WARN_ON(thread->return_error.cmd !=
3596						BR_OK);
3597					thread->return_error.cmd = BR_ERROR;
3598					binder_enqueue_thread_work(
3599						thread,
3600						&thread->return_error.work);
3601					binder_debug(
3602						BINDER_DEBUG_FAILED_TRANSACTION,
3603						"%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
3604						proc->pid, thread->pid);
3605					break;
3606				}
3607			}
3608			binder_proc_lock(proc);
3609			ref = binder_get_ref_olocked(proc, target, false);
3610			if (ref == NULL) {
3611				binder_user_error("%d:%d %s invalid ref %d\n",
3612					proc->pid, thread->pid,
3613					cmd == BC_REQUEST_DEATH_NOTIFICATION ?
3614					"BC_REQUEST_DEATH_NOTIFICATION" :
3615					"BC_CLEAR_DEATH_NOTIFICATION",
3616					target);
3617				binder_proc_unlock(proc);
3618				kfree(death);
3619				break;
3620			}
3621
3622			binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
3623				     "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
3624				     proc->pid, thread->pid,
3625				     cmd == BC_REQUEST_DEATH_NOTIFICATION ?
3626				     "BC_REQUEST_DEATH_NOTIFICATION" :
3627				     "BC_CLEAR_DEATH_NOTIFICATION",
3628				     (u64)cookie, ref->data.debug_id,
3629				     ref->data.desc, ref->data.strong,
3630				     ref->data.weak, ref->node->debug_id);
3631
3632			binder_node_lock(ref->node);
3633			if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
3634				if (ref->death) {
3635					binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
3636						proc->pid, thread->pid);
3637					binder_node_unlock(ref->node);
3638					binder_proc_unlock(proc);
3639					kfree(death);
3640					break;
3641				}
3642				binder_stats_created(BINDER_STAT_DEATH);
3643				INIT_LIST_HEAD(&death->work.entry);
3644				death->cookie = cookie;
3645				ref->death = death;
3646				if (ref->node->proc == NULL) {
3647					ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3648
3649					binder_inner_proc_lock(proc);
3650					binder_enqueue_work_ilocked(
3651						&ref->death->work, &proc->todo);
3652					binder_wakeup_proc_ilocked(proc);
3653					binder_inner_proc_unlock(proc);
3654				}
3655			} else {
3656				if (ref->death == NULL) {
3657					binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
3658						proc->pid, thread->pid);
3659					binder_node_unlock(ref->node);
3660					binder_proc_unlock(proc);
3661					break;
3662				}
3663				death = ref->death;
3664				if (death->cookie != cookie) {
3665					binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
3666						proc->pid, thread->pid,
3667						(u64)death->cookie,
3668						(u64)cookie);
3669					binder_node_unlock(ref->node);
3670					binder_proc_unlock(proc);
3671					break;
3672				}
3673				ref->death = NULL;
3674				binder_inner_proc_lock(proc);
3675				if (list_empty(&death->work.entry)) {
3676					death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
3677					if (thread->looper &
3678					    (BINDER_LOOPER_STATE_REGISTERED |
3679					     BINDER_LOOPER_STATE_ENTERED))
3680						binder_enqueue_thread_work_ilocked(
3681								thread,
3682								&death->work);
3683					else {
3684						binder_enqueue_work_ilocked(
3685								&death->work,
3686								&proc->todo);
3687						binder_wakeup_proc_ilocked(
3688								proc);
3689					}
3690				} else {
3691					BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
3692					death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
3693				}
3694				binder_inner_proc_unlock(proc);
3695			}
3696			binder_node_unlock(ref->node);
3697			binder_proc_unlock(proc);
3698		} break;
3699		case BC_DEAD_BINDER_DONE: {
3700			struct binder_work *w;
3701			binder_uintptr_t cookie;
3702			struct binder_ref_death *death = NULL;
3703
3704			if (get_user(cookie, (binder_uintptr_t __user *)ptr))
3705				return -EFAULT;
3706
3707			ptr += sizeof(cookie);
3708			binder_inner_proc_lock(proc);
3709			list_for_each_entry(w, &proc->delivered_death,
3710					    entry) {
3711				struct binder_ref_death *tmp_death =
3712					container_of(w,
3713						     struct binder_ref_death,
3714						     work);
3715
3716				if (tmp_death->cookie == cookie) {
3717					death = tmp_death;
3718					break;
3719				}
3720			}
3721			binder_debug(BINDER_DEBUG_DEAD_BINDER,
3722				     "%d:%d BC_DEAD_BINDER_DONE %016llx found %pK\n",
3723				     proc->pid, thread->pid, (u64)cookie,
3724				     death);
3725			if (death == NULL) {
3726				binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
3727					proc->pid, thread->pid, (u64)cookie);
3728				binder_inner_proc_unlock(proc);
3729				break;
3730			}
3731			binder_dequeue_work_ilocked(&death->work);
3732			if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
3733				death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
3734				if (thread->looper &
3735					(BINDER_LOOPER_STATE_REGISTERED |
3736					 BINDER_LOOPER_STATE_ENTERED))
3737					binder_enqueue_thread_work_ilocked(
3738						thread, &death->work);
3739				else {
3740					binder_enqueue_work_ilocked(
3741							&death->work,
3742							&proc->todo);
3743					binder_wakeup_proc_ilocked(proc);
3744				}
3745			}
3746			binder_inner_proc_unlock(proc);
3747		} break;
3748
3749		default:
3750			pr_err("%d:%d unknown command %d\n",
3751			       proc->pid, thread->pid, cmd);
3752			return -EINVAL;
3753		}
3754		*consumed = ptr - buffer;
3755	}
3756	return 0;
3757}
3758
3759static void binder_stat_br(struct binder_proc *proc,
3760			   struct binder_thread *thread, uint32_t cmd)
3761{
3762	trace_binder_return(cmd);
3763	if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
3764		atomic_inc(&binder_stats.br[_IOC_NR(cmd)]);
3765		atomic_inc(&proc->stats.br[_IOC_NR(cmd)]);
3766		atomic_inc(&thread->stats.br[_IOC_NR(cmd)]);
3767	}
3768}
3769
3770static int binder_put_node_cmd(struct binder_proc *proc,
3771			       struct binder_thread *thread,
3772			       void __user **ptrp,
3773			       binder_uintptr_t node_ptr,
3774			       binder_uintptr_t node_cookie,
3775			       int node_debug_id,
3776			       uint32_t cmd, const char *cmd_name)
3777{
3778	void __user *ptr = *ptrp;
3779
3780	if (put_user(cmd, (uint32_t __user *)ptr))
3781		return -EFAULT;
3782	ptr += sizeof(uint32_t);
3783
3784	if (put_user(node_ptr, (binder_uintptr_t __user *)ptr))
3785		return -EFAULT;
3786	ptr += sizeof(binder_uintptr_t);
3787
3788	if (put_user(node_cookie, (binder_uintptr_t __user *)ptr))
3789		return -EFAULT;
3790	ptr += sizeof(binder_uintptr_t);
3791
3792	binder_stat_br(proc, thread, cmd);
3793	binder_debug(BINDER_DEBUG_USER_REFS, "%d:%d %s %d u%016llx c%016llx\n",
3794		     proc->pid, thread->pid, cmd_name, node_debug_id,
3795		     (u64)node_ptr, (u64)node_cookie);
3796
3797	*ptrp = ptr;
3798	return 0;
3799}
3800
3801static int binder_wait_for_work(struct binder_thread *thread,
3802				bool do_proc_work)
3803{
3804	DEFINE_WAIT(wait);
3805	struct binder_proc *proc = thread->proc;
3806	int ret = 0;
3807
3808	freezer_do_not_count();
3809	binder_inner_proc_lock(proc);
3810	for (;;) {
3811		prepare_to_wait(&thread->wait, &wait, TASK_INTERRUPTIBLE);
3812		if (binder_has_work_ilocked(thread, do_proc_work))
3813			break;
3814		if (do_proc_work)
3815			list_add(&thread->waiting_thread_node,
3816				 &proc->waiting_threads);
3817		binder_inner_proc_unlock(proc);
3818		schedule();
3819		binder_inner_proc_lock(proc);
3820		list_del_init(&thread->waiting_thread_node);
3821		if (signal_pending(current)) {
3822			ret = -ERESTARTSYS;
3823			break;
3824		}
3825	}
3826	finish_wait(&thread->wait, &wait);
3827	binder_inner_proc_unlock(proc);
3828	freezer_count();
3829
3830	return ret;
3831}
3832
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3833static int binder_thread_read(struct binder_proc *proc,
3834			      struct binder_thread *thread,
3835			      binder_uintptr_t binder_buffer, size_t size,
3836			      binder_size_t *consumed, int non_block)
3837{
3838	void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
3839	void __user *ptr = buffer + *consumed;
3840	void __user *end = buffer + size;
3841
3842	int ret = 0;
3843	int wait_for_proc_work;
3844
3845	if (*consumed == 0) {
3846		if (put_user(BR_NOOP, (uint32_t __user *)ptr))
3847			return -EFAULT;
3848		ptr += sizeof(uint32_t);
3849	}
3850
3851retry:
3852	binder_inner_proc_lock(proc);
3853	wait_for_proc_work = binder_available_for_proc_work_ilocked(thread);
3854	binder_inner_proc_unlock(proc);
3855
3856	thread->looper |= BINDER_LOOPER_STATE_WAITING;
3857
3858	trace_binder_wait_for_work(wait_for_proc_work,
3859				   !!thread->transaction_stack,
3860				   !binder_worklist_empty(proc, &thread->todo));
3861	if (wait_for_proc_work) {
3862		if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
3863					BINDER_LOOPER_STATE_ENTERED))) {
3864			binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
3865				proc->pid, thread->pid, thread->looper);
3866			wait_event_interruptible(binder_user_error_wait,
3867						 binder_stop_on_user_error < 2);
3868		}
3869		binder_set_nice(proc->default_priority);
3870	}
3871
3872	if (non_block) {
3873		if (!binder_has_work(thread, wait_for_proc_work))
3874			ret = -EAGAIN;
3875	} else {
3876		ret = binder_wait_for_work(thread, wait_for_proc_work);
3877	}
3878
3879	thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
3880
3881	if (ret)
3882		return ret;
3883
3884	while (1) {
3885		uint32_t cmd;
3886		struct binder_transaction_data tr;
 
3887		struct binder_work *w = NULL;
3888		struct list_head *list = NULL;
3889		struct binder_transaction *t = NULL;
3890		struct binder_thread *t_from;
 
3891
3892		binder_inner_proc_lock(proc);
3893		if (!binder_worklist_empty_ilocked(&thread->todo))
3894			list = &thread->todo;
3895		else if (!binder_worklist_empty_ilocked(&proc->todo) &&
3896			   wait_for_proc_work)
3897			list = &proc->todo;
3898		else {
3899			binder_inner_proc_unlock(proc);
3900
3901			/* no data added */
3902			if (ptr - buffer == 4 && !thread->looper_need_return)
3903				goto retry;
3904			break;
3905		}
3906
3907		if (end - ptr < sizeof(tr) + 4) {
3908			binder_inner_proc_unlock(proc);
3909			break;
3910		}
3911		w = binder_dequeue_work_head_ilocked(list);
3912		if (binder_worklist_empty_ilocked(&thread->todo))
3913			thread->process_todo = false;
3914
3915		switch (w->type) {
3916		case BINDER_WORK_TRANSACTION: {
3917			binder_inner_proc_unlock(proc);
3918			t = container_of(w, struct binder_transaction, work);
3919		} break;
3920		case BINDER_WORK_RETURN_ERROR: {
3921			struct binder_error *e = container_of(
3922					w, struct binder_error, work);
3923
3924			WARN_ON(e->cmd == BR_OK);
3925			binder_inner_proc_unlock(proc);
3926			if (put_user(e->cmd, (uint32_t __user *)ptr))
3927				return -EFAULT;
 
3928			e->cmd = BR_OK;
3929			ptr += sizeof(uint32_t);
3930
3931			binder_stat_br(proc, thread, e->cmd);
3932		} break;
3933		case BINDER_WORK_TRANSACTION_COMPLETE: {
 
 
 
 
 
 
 
 
 
3934			binder_inner_proc_unlock(proc);
3935			cmd = BR_TRANSACTION_COMPLETE;
 
3936			if (put_user(cmd, (uint32_t __user *)ptr))
3937				return -EFAULT;
3938			ptr += sizeof(uint32_t);
3939
3940			binder_stat_br(proc, thread, cmd);
3941			binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
3942				     "%d:%d BR_TRANSACTION_COMPLETE\n",
3943				     proc->pid, thread->pid);
3944			kfree(w);
3945			binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
3946		} break;
3947		case BINDER_WORK_NODE: {
3948			struct binder_node *node = container_of(w, struct binder_node, work);
3949			int strong, weak;
3950			binder_uintptr_t node_ptr = node->ptr;
3951			binder_uintptr_t node_cookie = node->cookie;
3952			int node_debug_id = node->debug_id;
3953			int has_weak_ref;
3954			int has_strong_ref;
3955			void __user *orig_ptr = ptr;
3956
3957			BUG_ON(proc != node->proc);
3958			strong = node->internal_strong_refs ||
3959					node->local_strong_refs;
3960			weak = !hlist_empty(&node->refs) ||
3961					node->local_weak_refs ||
3962					node->tmp_refs || strong;
3963			has_strong_ref = node->has_strong_ref;
3964			has_weak_ref = node->has_weak_ref;
3965
3966			if (weak && !has_weak_ref) {
3967				node->has_weak_ref = 1;
3968				node->pending_weak_ref = 1;
3969				node->local_weak_refs++;
3970			}
3971			if (strong && !has_strong_ref) {
3972				node->has_strong_ref = 1;
3973				node->pending_strong_ref = 1;
3974				node->local_strong_refs++;
3975			}
3976			if (!strong && has_strong_ref)
3977				node->has_strong_ref = 0;
3978			if (!weak && has_weak_ref)
3979				node->has_weak_ref = 0;
3980			if (!weak && !strong) {
3981				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
3982					     "%d:%d node %d u%016llx c%016llx deleted\n",
3983					     proc->pid, thread->pid,
3984					     node_debug_id,
3985					     (u64)node_ptr,
3986					     (u64)node_cookie);
3987				rb_erase(&node->rb_node, &proc->nodes);
3988				binder_inner_proc_unlock(proc);
3989				binder_node_lock(node);
3990				/*
3991				 * Acquire the node lock before freeing the
3992				 * node to serialize with other threads that
3993				 * may have been holding the node lock while
3994				 * decrementing this node (avoids race where
3995				 * this thread frees while the other thread
3996				 * is unlocking the node after the final
3997				 * decrement)
3998				 */
3999				binder_node_unlock(node);
4000				binder_free_node(node);
4001			} else
4002				binder_inner_proc_unlock(proc);
4003
4004			if (weak && !has_weak_ref)
4005				ret = binder_put_node_cmd(
4006						proc, thread, &ptr, node_ptr,
4007						node_cookie, node_debug_id,
4008						BR_INCREFS, "BR_INCREFS");
4009			if (!ret && strong && !has_strong_ref)
4010				ret = binder_put_node_cmd(
4011						proc, thread, &ptr, node_ptr,
4012						node_cookie, node_debug_id,
4013						BR_ACQUIRE, "BR_ACQUIRE");
4014			if (!ret && !strong && has_strong_ref)
4015				ret = binder_put_node_cmd(
4016						proc, thread, &ptr, node_ptr,
4017						node_cookie, node_debug_id,
4018						BR_RELEASE, "BR_RELEASE");
4019			if (!ret && !weak && has_weak_ref)
4020				ret = binder_put_node_cmd(
4021						proc, thread, &ptr, node_ptr,
4022						node_cookie, node_debug_id,
4023						BR_DECREFS, "BR_DECREFS");
4024			if (orig_ptr == ptr)
4025				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
4026					     "%d:%d node %d u%016llx c%016llx state unchanged\n",
4027					     proc->pid, thread->pid,
4028					     node_debug_id,
4029					     (u64)node_ptr,
4030					     (u64)node_cookie);
4031			if (ret)
4032				return ret;
4033		} break;
4034		case BINDER_WORK_DEAD_BINDER:
4035		case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
4036		case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
4037			struct binder_ref_death *death;
4038			uint32_t cmd;
4039			binder_uintptr_t cookie;
4040
4041			death = container_of(w, struct binder_ref_death, work);
4042			if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
4043				cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
4044			else
4045				cmd = BR_DEAD_BINDER;
4046			cookie = death->cookie;
4047
4048			binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
4049				     "%d:%d %s %016llx\n",
4050				      proc->pid, thread->pid,
4051				      cmd == BR_DEAD_BINDER ?
4052				      "BR_DEAD_BINDER" :
4053				      "BR_CLEAR_DEATH_NOTIFICATION_DONE",
4054				      (u64)cookie);
4055			if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
4056				binder_inner_proc_unlock(proc);
4057				kfree(death);
4058				binder_stats_deleted(BINDER_STAT_DEATH);
4059			} else {
4060				binder_enqueue_work_ilocked(
4061						w, &proc->delivered_death);
4062				binder_inner_proc_unlock(proc);
4063			}
4064			if (put_user(cmd, (uint32_t __user *)ptr))
4065				return -EFAULT;
4066			ptr += sizeof(uint32_t);
4067			if (put_user(cookie,
4068				     (binder_uintptr_t __user *)ptr))
4069				return -EFAULT;
4070			ptr += sizeof(binder_uintptr_t);
4071			binder_stat_br(proc, thread, cmd);
4072			if (cmd == BR_DEAD_BINDER)
4073				goto done; /* DEAD_BINDER notifications can cause transactions */
4074		} break;
 
 
 
 
 
4075		}
4076
4077		if (!t)
4078			continue;
4079
4080		BUG_ON(t->buffer == NULL);
4081		if (t->buffer->target_node) {
4082			struct binder_node *target_node = t->buffer->target_node;
4083
4084			tr.target.ptr = target_node->ptr;
4085			tr.cookie =  target_node->cookie;
4086			t->saved_priority = task_nice(current);
4087			if (t->priority < target_node->min_priority &&
4088			    !(t->flags & TF_ONE_WAY))
4089				binder_set_nice(t->priority);
4090			else if (!(t->flags & TF_ONE_WAY) ||
4091				 t->saved_priority > target_node->min_priority)
4092				binder_set_nice(target_node->min_priority);
4093			cmd = BR_TRANSACTION;
4094		} else {
4095			tr.target.ptr = 0;
4096			tr.cookie = 0;
4097			cmd = BR_REPLY;
4098		}
4099		tr.code = t->code;
4100		tr.flags = t->flags;
4101		tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
4102
4103		t_from = binder_get_txn_from(t);
4104		if (t_from) {
4105			struct task_struct *sender = t_from->proc->tsk;
4106
4107			tr.sender_pid = task_tgid_nr_ns(sender,
4108							task_active_pid_ns(current));
 
4109		} else {
4110			tr.sender_pid = 0;
4111		}
4112
4113		tr.data_size = t->buffer->data_size;
4114		tr.offsets_size = t->buffer->offsets_size;
4115		tr.data.ptr.buffer = (binder_uintptr_t)
4116			((uintptr_t)t->buffer->data +
4117			binder_alloc_get_user_buffer_offset(&proc->alloc));
4118		tr.data.ptr.offsets = tr.data.ptr.buffer +
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4119					ALIGN(t->buffer->data_size,
4120					    sizeof(void *));
4121
 
 
 
 
 
4122		if (put_user(cmd, (uint32_t __user *)ptr)) {
4123			if (t_from)
4124				binder_thread_dec_tmpref(t_from);
4125
4126			binder_cleanup_transaction(t, "put_user failed",
4127						   BR_FAILED_REPLY);
4128
4129			return -EFAULT;
4130		}
4131		ptr += sizeof(uint32_t);
4132		if (copy_to_user(ptr, &tr, sizeof(tr))) {
4133			if (t_from)
4134				binder_thread_dec_tmpref(t_from);
4135
4136			binder_cleanup_transaction(t, "copy_to_user failed",
4137						   BR_FAILED_REPLY);
4138
4139			return -EFAULT;
4140		}
4141		ptr += sizeof(tr);
4142
4143		trace_binder_transaction_received(t);
4144		binder_stat_br(proc, thread, cmd);
4145		binder_debug(BINDER_DEBUG_TRANSACTION,
4146			     "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
4147			     proc->pid, thread->pid,
4148			     (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
4149			     "BR_REPLY",
 
4150			     t->debug_id, t_from ? t_from->proc->pid : 0,
4151			     t_from ? t_from->pid : 0, cmd,
4152			     t->buffer->data_size, t->buffer->offsets_size,
4153			     (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
 
4154
4155		if (t_from)
4156			binder_thread_dec_tmpref(t_from);
4157		t->buffer->allow_user_free = 1;
4158		if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
4159			binder_inner_proc_lock(thread->proc);
4160			t->to_parent = thread->transaction_stack;
4161			t->to_thread = thread;
4162			thread->transaction_stack = t;
4163			binder_inner_proc_unlock(thread->proc);
4164		} else {
4165			binder_free_transaction(t);
4166		}
4167		break;
4168	}
4169
4170done:
4171
4172	*consumed = ptr - buffer;
4173	binder_inner_proc_lock(proc);
4174	if (proc->requested_threads == 0 &&
4175	    list_empty(&thread->proc->waiting_threads) &&
4176	    proc->requested_threads_started < proc->max_threads &&
4177	    (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
4178	     BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
4179	     /*spawn a new thread if we leave this out */) {
4180		proc->requested_threads++;
4181		binder_inner_proc_unlock(proc);
4182		binder_debug(BINDER_DEBUG_THREADS,
4183			     "%d:%d BR_SPAWN_LOOPER\n",
4184			     proc->pid, thread->pid);
4185		if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
4186			return -EFAULT;
4187		binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
4188	} else
4189		binder_inner_proc_unlock(proc);
4190	return 0;
4191}
4192
4193static void binder_release_work(struct binder_proc *proc,
4194				struct list_head *list)
4195{
4196	struct binder_work *w;
 
4197
4198	while (1) {
4199		w = binder_dequeue_work_head(proc, list);
 
 
 
4200		if (!w)
4201			return;
4202
4203		switch (w->type) {
4204		case BINDER_WORK_TRANSACTION: {
4205			struct binder_transaction *t;
4206
4207			t = container_of(w, struct binder_transaction, work);
4208
4209			binder_cleanup_transaction(t, "process died.",
4210						   BR_DEAD_REPLY);
4211		} break;
4212		case BINDER_WORK_RETURN_ERROR: {
4213			struct binder_error *e = container_of(
4214					w, struct binder_error, work);
4215
4216			binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
4217				"undelivered TRANSACTION_ERROR: %u\n",
4218				e->cmd);
4219		} break;
 
 
4220		case BINDER_WORK_TRANSACTION_COMPLETE: {
4221			binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
4222				"undelivered TRANSACTION_COMPLETE\n");
4223			kfree(w);
4224			binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
4225		} break;
4226		case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
4227		case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
4228			struct binder_ref_death *death;
4229
4230			death = container_of(w, struct binder_ref_death, work);
4231			binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
4232				"undelivered death notification, %016llx\n",
4233				(u64)death->cookie);
4234			kfree(death);
4235			binder_stats_deleted(BINDER_STAT_DEATH);
4236		} break;
 
 
4237		default:
4238			pr_err("unexpected work type, %d, not freed\n",
4239			       w->type);
4240			break;
4241		}
4242	}
4243
4244}
4245
4246static struct binder_thread *binder_get_thread_ilocked(
4247		struct binder_proc *proc, struct binder_thread *new_thread)
4248{
4249	struct binder_thread *thread = NULL;
4250	struct rb_node *parent = NULL;
4251	struct rb_node **p = &proc->threads.rb_node;
4252
4253	while (*p) {
4254		parent = *p;
4255		thread = rb_entry(parent, struct binder_thread, rb_node);
4256
4257		if (current->pid < thread->pid)
4258			p = &(*p)->rb_left;
4259		else if (current->pid > thread->pid)
4260			p = &(*p)->rb_right;
4261		else
4262			return thread;
4263	}
4264	if (!new_thread)
4265		return NULL;
4266	thread = new_thread;
4267	binder_stats_created(BINDER_STAT_THREAD);
4268	thread->proc = proc;
4269	thread->pid = current->pid;
4270	atomic_set(&thread->tmp_ref, 0);
4271	init_waitqueue_head(&thread->wait);
4272	INIT_LIST_HEAD(&thread->todo);
4273	rb_link_node(&thread->rb_node, parent, p);
4274	rb_insert_color(&thread->rb_node, &proc->threads);
4275	thread->looper_need_return = true;
4276	thread->return_error.work.type = BINDER_WORK_RETURN_ERROR;
4277	thread->return_error.cmd = BR_OK;
4278	thread->reply_error.work.type = BINDER_WORK_RETURN_ERROR;
4279	thread->reply_error.cmd = BR_OK;
 
4280	INIT_LIST_HEAD(&new_thread->waiting_thread_node);
4281	return thread;
4282}
4283
4284static struct binder_thread *binder_get_thread(struct binder_proc *proc)
4285{
4286	struct binder_thread *thread;
4287	struct binder_thread *new_thread;
4288
4289	binder_inner_proc_lock(proc);
4290	thread = binder_get_thread_ilocked(proc, NULL);
4291	binder_inner_proc_unlock(proc);
4292	if (!thread) {
4293		new_thread = kzalloc(sizeof(*thread), GFP_KERNEL);
4294		if (new_thread == NULL)
4295			return NULL;
4296		binder_inner_proc_lock(proc);
4297		thread = binder_get_thread_ilocked(proc, new_thread);
4298		binder_inner_proc_unlock(proc);
4299		if (thread != new_thread)
4300			kfree(new_thread);
4301	}
4302	return thread;
4303}
4304
4305static void binder_free_proc(struct binder_proc *proc)
4306{
 
 
4307	BUG_ON(!list_empty(&proc->todo));
4308	BUG_ON(!list_empty(&proc->delivered_death));
 
 
 
 
 
 
 
 
4309	binder_alloc_deferred_release(&proc->alloc);
4310	put_task_struct(proc->tsk);
 
4311	binder_stats_deleted(BINDER_STAT_PROC);
4312	kfree(proc);
4313}
4314
4315static void binder_free_thread(struct binder_thread *thread)
4316{
4317	BUG_ON(!list_empty(&thread->todo));
4318	binder_stats_deleted(BINDER_STAT_THREAD);
4319	binder_proc_dec_tmpref(thread->proc);
4320	kfree(thread);
4321}
4322
4323static int binder_thread_release(struct binder_proc *proc,
4324				 struct binder_thread *thread)
4325{
4326	struct binder_transaction *t;
4327	struct binder_transaction *send_reply = NULL;
4328	int active_transactions = 0;
4329	struct binder_transaction *last_t = NULL;
4330
4331	binder_inner_proc_lock(thread->proc);
4332	/*
4333	 * take a ref on the proc so it survives
4334	 * after we remove this thread from proc->threads.
4335	 * The corresponding dec is when we actually
4336	 * free the thread in binder_free_thread()
4337	 */
4338	proc->tmp_ref++;
4339	/*
4340	 * take a ref on this thread to ensure it
4341	 * survives while we are releasing it
4342	 */
4343	atomic_inc(&thread->tmp_ref);
4344	rb_erase(&thread->rb_node, &proc->threads);
4345	t = thread->transaction_stack;
4346	if (t) {
4347		spin_lock(&t->lock);
4348		if (t->to_thread == thread)
4349			send_reply = t;
 
 
4350	}
4351	thread->is_dead = true;
4352
4353	while (t) {
4354		last_t = t;
4355		active_transactions++;
4356		binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
4357			     "release %d:%d transaction %d %s, still active\n",
4358			      proc->pid, thread->pid,
4359			     t->debug_id,
4360			     (t->to_thread == thread) ? "in" : "out");
4361
4362		if (t->to_thread == thread) {
 
4363			t->to_proc = NULL;
4364			t->to_thread = NULL;
4365			if (t->buffer) {
4366				t->buffer->transaction = NULL;
4367				t->buffer = NULL;
4368			}
4369			t = t->to_parent;
4370		} else if (t->from == thread) {
4371			t->from = NULL;
4372			t = t->from_parent;
4373		} else
4374			BUG();
4375		spin_unlock(&last_t->lock);
4376		if (t)
4377			spin_lock(&t->lock);
 
 
4378	}
 
 
4379
4380	/*
4381	 * If this thread used poll, make sure we remove the waitqueue
4382	 * from any epoll data structures holding it with POLLFREE.
4383	 * waitqueue_active() is safe to use here because we're holding
4384	 * the inner lock.
4385	 */
4386	if ((thread->looper & BINDER_LOOPER_STATE_POLL) &&
4387	    waitqueue_active(&thread->wait)) {
4388		wake_up_poll(&thread->wait, EPOLLHUP | POLLFREE);
4389	}
4390
4391	binder_inner_proc_unlock(thread->proc);
4392
4393	/*
4394	 * This is needed to avoid races between wake_up_poll() above and
4395	 * and ep_remove_waitqueue() called for other reasons (eg the epoll file
4396	 * descriptor being closed); ep_remove_waitqueue() holds an RCU read
4397	 * lock, so we can be sure it's done after calling synchronize_rcu().
 
4398	 */
4399	if (thread->looper & BINDER_LOOPER_STATE_POLL)
4400		synchronize_rcu();
4401
4402	if (send_reply)
4403		binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
4404	binder_release_work(proc, &thread->todo);
4405	binder_thread_dec_tmpref(thread);
4406	return active_transactions;
4407}
4408
4409static __poll_t binder_poll(struct file *filp,
4410				struct poll_table_struct *wait)
4411{
4412	struct binder_proc *proc = filp->private_data;
4413	struct binder_thread *thread = NULL;
4414	bool wait_for_proc_work;
4415
4416	thread = binder_get_thread(proc);
4417	if (!thread)
4418		return POLLERR;
4419
4420	binder_inner_proc_lock(thread->proc);
4421	thread->looper |= BINDER_LOOPER_STATE_POLL;
4422	wait_for_proc_work = binder_available_for_proc_work_ilocked(thread);
4423
4424	binder_inner_proc_unlock(thread->proc);
4425
4426	poll_wait(filp, &thread->wait, wait);
4427
4428	if (binder_has_work(thread, wait_for_proc_work))
4429		return EPOLLIN;
4430
4431	return 0;
4432}
4433
4434static int binder_ioctl_write_read(struct file *filp,
4435				unsigned int cmd, unsigned long arg,
4436				struct binder_thread *thread)
4437{
4438	int ret = 0;
4439	struct binder_proc *proc = filp->private_data;
4440	unsigned int size = _IOC_SIZE(cmd);
4441	void __user *ubuf = (void __user *)arg;
4442	struct binder_write_read bwr;
4443
4444	if (size != sizeof(struct binder_write_read)) {
4445		ret = -EINVAL;
4446		goto out;
4447	}
4448	if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
4449		ret = -EFAULT;
4450		goto out;
4451	}
4452	binder_debug(BINDER_DEBUG_READ_WRITE,
4453		     "%d:%d write %lld at %016llx, read %lld at %016llx\n",
4454		     proc->pid, thread->pid,
4455		     (u64)bwr.write_size, (u64)bwr.write_buffer,
4456		     (u64)bwr.read_size, (u64)bwr.read_buffer);
4457
4458	if (bwr.write_size > 0) {
4459		ret = binder_thread_write(proc, thread,
4460					  bwr.write_buffer,
4461					  bwr.write_size,
4462					  &bwr.write_consumed);
4463		trace_binder_write_done(ret);
4464		if (ret < 0) {
4465			bwr.read_consumed = 0;
4466			if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
4467				ret = -EFAULT;
4468			goto out;
4469		}
4470	}
4471	if (bwr.read_size > 0) {
4472		ret = binder_thread_read(proc, thread, bwr.read_buffer,
4473					 bwr.read_size,
4474					 &bwr.read_consumed,
4475					 filp->f_flags & O_NONBLOCK);
4476		trace_binder_read_done(ret);
4477		binder_inner_proc_lock(proc);
4478		if (!binder_worklist_empty_ilocked(&proc->todo))
4479			binder_wakeup_proc_ilocked(proc);
4480		binder_inner_proc_unlock(proc);
4481		if (ret < 0) {
4482			if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
4483				ret = -EFAULT;
4484			goto out;
4485		}
4486	}
4487	binder_debug(BINDER_DEBUG_READ_WRITE,
4488		     "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
4489		     proc->pid, thread->pid,
4490		     (u64)bwr.write_consumed, (u64)bwr.write_size,
4491		     (u64)bwr.read_consumed, (u64)bwr.read_size);
4492	if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
4493		ret = -EFAULT;
4494		goto out;
4495	}
4496out:
4497	return ret;
4498}
4499
4500static int binder_ioctl_set_ctx_mgr(struct file *filp)
 
4501{
4502	int ret = 0;
4503	struct binder_proc *proc = filp->private_data;
4504	struct binder_context *context = proc->context;
4505	struct binder_node *new_node;
4506	kuid_t curr_euid = current_euid();
4507
4508	mutex_lock(&context->context_mgr_node_lock);
4509	if (context->binder_context_mgr_node) {
4510		pr_err("BINDER_SET_CONTEXT_MGR already set\n");
4511		ret = -EBUSY;
4512		goto out;
4513	}
4514	ret = security_binder_set_context_mgr(proc->tsk);
4515	if (ret < 0)
4516		goto out;
4517	if (uid_valid(context->binder_context_mgr_uid)) {
4518		if (!uid_eq(context->binder_context_mgr_uid, curr_euid)) {
4519			pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
4520			       from_kuid(&init_user_ns, curr_euid),
4521			       from_kuid(&init_user_ns,
4522					 context->binder_context_mgr_uid));
4523			ret = -EPERM;
4524			goto out;
4525		}
4526	} else {
4527		context->binder_context_mgr_uid = curr_euid;
4528	}
4529	new_node = binder_new_node(proc, NULL);
4530	if (!new_node) {
4531		ret = -ENOMEM;
4532		goto out;
4533	}
4534	binder_node_lock(new_node);
4535	new_node->local_weak_refs++;
4536	new_node->local_strong_refs++;
4537	new_node->has_strong_ref = 1;
4538	new_node->has_weak_ref = 1;
4539	context->binder_context_mgr_node = new_node;
4540	binder_node_unlock(new_node);
4541	binder_put_node(new_node);
4542out:
4543	mutex_unlock(&context->context_mgr_node_lock);
4544	return ret;
4545}
4546
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4547static int binder_ioctl_get_node_debug_info(struct binder_proc *proc,
4548				struct binder_node_debug_info *info)
4549{
4550	struct rb_node *n;
4551	binder_uintptr_t ptr = info->ptr;
4552
4553	memset(info, 0, sizeof(*info));
4554
4555	binder_inner_proc_lock(proc);
4556	for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
4557		struct binder_node *node = rb_entry(n, struct binder_node,
4558						    rb_node);
4559		if (node->ptr > ptr) {
4560			info->ptr = node->ptr;
4561			info->cookie = node->cookie;
4562			info->has_strong_ref = node->has_strong_ref;
4563			info->has_weak_ref = node->has_weak_ref;
4564			break;
4565		}
4566	}
4567	binder_inner_proc_unlock(proc);
4568
4569	return 0;
4570}
4571
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4572static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
4573{
4574	int ret;
4575	struct binder_proc *proc = filp->private_data;
4576	struct binder_thread *thread;
4577	unsigned int size = _IOC_SIZE(cmd);
4578	void __user *ubuf = (void __user *)arg;
4579
4580	/*pr_info("binder_ioctl: %d:%d %x %lx\n",
4581			proc->pid, current->pid, cmd, arg);*/
4582
4583	binder_selftest_alloc(&proc->alloc);
4584
4585	trace_binder_ioctl(cmd, arg);
4586
4587	ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
4588	if (ret)
4589		goto err_unlocked;
4590
4591	thread = binder_get_thread(proc);
4592	if (thread == NULL) {
4593		ret = -ENOMEM;
4594		goto err;
4595	}
4596
4597	switch (cmd) {
4598	case BINDER_WRITE_READ:
4599		ret = binder_ioctl_write_read(filp, cmd, arg, thread);
4600		if (ret)
4601			goto err;
4602		break;
4603	case BINDER_SET_MAX_THREADS: {
4604		int max_threads;
4605
4606		if (copy_from_user(&max_threads, ubuf,
4607				   sizeof(max_threads))) {
4608			ret = -EINVAL;
4609			goto err;
4610		}
4611		binder_inner_proc_lock(proc);
4612		proc->max_threads = max_threads;
4613		binder_inner_proc_unlock(proc);
4614		break;
4615	}
 
 
 
 
 
 
 
 
 
 
 
 
4616	case BINDER_SET_CONTEXT_MGR:
4617		ret = binder_ioctl_set_ctx_mgr(filp);
4618		if (ret)
4619			goto err;
4620		break;
4621	case BINDER_THREAD_EXIT:
4622		binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
4623			     proc->pid, thread->pid);
4624		binder_thread_release(proc, thread);
4625		thread = NULL;
4626		break;
4627	case BINDER_VERSION: {
4628		struct binder_version __user *ver = ubuf;
4629
4630		if (size != sizeof(struct binder_version)) {
4631			ret = -EINVAL;
4632			goto err;
4633		}
4634		if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
4635			     &ver->protocol_version)) {
4636			ret = -EINVAL;
4637			goto err;
4638		}
4639		break;
4640	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4641	case BINDER_GET_NODE_DEBUG_INFO: {
4642		struct binder_node_debug_info info;
4643
4644		if (copy_from_user(&info, ubuf, sizeof(info))) {
4645			ret = -EFAULT;
4646			goto err;
4647		}
4648
4649		ret = binder_ioctl_get_node_debug_info(proc, &info);
4650		if (ret < 0)
4651			goto err;
4652
4653		if (copy_to_user(ubuf, &info, sizeof(info))) {
4654			ret = -EFAULT;
4655			goto err;
4656		}
4657		break;
4658	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4659	default:
4660		ret = -EINVAL;
4661		goto err;
4662	}
4663	ret = 0;
4664err:
4665	if (thread)
4666		thread->looper_need_return = false;
4667	wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
4668	if (ret && ret != -ERESTARTSYS)
4669		pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
4670err_unlocked:
4671	trace_binder_ioctl_done(ret);
4672	return ret;
4673}
4674
4675static void binder_vma_open(struct vm_area_struct *vma)
4676{
4677	struct binder_proc *proc = vma->vm_private_data;
4678
4679	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
4680		     "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
4681		     proc->pid, vma->vm_start, vma->vm_end,
4682		     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
4683		     (unsigned long)pgprot_val(vma->vm_page_prot));
4684}
4685
4686static void binder_vma_close(struct vm_area_struct *vma)
4687{
4688	struct binder_proc *proc = vma->vm_private_data;
4689
4690	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
4691		     "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
4692		     proc->pid, vma->vm_start, vma->vm_end,
4693		     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
4694		     (unsigned long)pgprot_val(vma->vm_page_prot));
4695	binder_alloc_vma_close(&proc->alloc);
4696	binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
4697}
4698
4699static int binder_vm_fault(struct vm_fault *vmf)
4700{
4701	return VM_FAULT_SIGBUS;
4702}
4703
4704static const struct vm_operations_struct binder_vm_ops = {
4705	.open = binder_vma_open,
4706	.close = binder_vma_close,
4707	.fault = binder_vm_fault,
4708};
4709
4710static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
4711{
4712	int ret;
4713	struct binder_proc *proc = filp->private_data;
4714	const char *failure_string;
4715
4716	if (proc->tsk != current->group_leader)
4717		return -EINVAL;
4718
4719	if ((vma->vm_end - vma->vm_start) > SZ_4M)
4720		vma->vm_end = vma->vm_start + SZ_4M;
4721
4722	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
4723		     "%s: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
4724		     __func__, proc->pid, vma->vm_start, vma->vm_end,
4725		     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
4726		     (unsigned long)pgprot_val(vma->vm_page_prot));
4727
4728	if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
4729		ret = -EPERM;
4730		failure_string = "bad vm_flags";
4731		goto err_bad_arg;
4732	}
4733	vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
 
4734	vma->vm_ops = &binder_vm_ops;
4735	vma->vm_private_data = proc;
4736
4737	ret = binder_alloc_mmap_handler(&proc->alloc, vma);
4738	if (ret)
4739		return ret;
4740	mutex_lock(&proc->files_lock);
4741	proc->files = get_files_struct(current);
4742	mutex_unlock(&proc->files_lock);
4743	return 0;
4744
4745err_bad_arg:
4746	pr_err("%s: %d %lx-%lx %s failed %d\n", __func__,
4747	       proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
4748	return ret;
4749}
4750
4751static int binder_open(struct inode *nodp, struct file *filp)
4752{
4753	struct binder_proc *proc;
4754	struct binder_device *binder_dev;
 
 
 
4755
4756	binder_debug(BINDER_DEBUG_OPEN_CLOSE, "%s: %d:%d\n", __func__,
4757		     current->group_leader->pid, current->pid);
4758
4759	proc = kzalloc(sizeof(*proc), GFP_KERNEL);
4760	if (proc == NULL)
4761		return -ENOMEM;
4762	spin_lock_init(&proc->inner_lock);
4763	spin_lock_init(&proc->outer_lock);
4764	get_task_struct(current->group_leader);
4765	proc->tsk = current->group_leader;
4766	mutex_init(&proc->files_lock);
4767	INIT_LIST_HEAD(&proc->todo);
 
4768	proc->default_priority = task_nice(current);
4769	binder_dev = container_of(filp->private_data, struct binder_device,
4770				  miscdev);
 
 
 
 
 
 
 
 
4771	proc->context = &binder_dev->context;
4772	binder_alloc_init(&proc->alloc);
4773
4774	binder_stats_created(BINDER_STAT_PROC);
4775	proc->pid = current->group_leader->pid;
4776	INIT_LIST_HEAD(&proc->delivered_death);
4777	INIT_LIST_HEAD(&proc->waiting_threads);
4778	filp->private_data = proc;
4779
4780	mutex_lock(&binder_procs_lock);
 
 
 
 
 
 
4781	hlist_add_head(&proc->proc_node, &binder_procs);
4782	mutex_unlock(&binder_procs_lock);
4783
4784	if (binder_debugfs_dir_entry_proc) {
4785		char strbuf[11];
4786
4787		snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
4788		/*
4789		 * proc debug entries are shared between contexts, so
4790		 * this will fail if the process tries to open the driver
4791		 * again with a different context. The priting code will
4792		 * anyway print all contexts that a given PID has, so this
4793		 * is not a problem.
4794		 */
4795		proc->debugfs_entry = debugfs_create_file(strbuf, 0444,
4796			binder_debugfs_dir_entry_proc,
4797			(void *)(unsigned long)proc->pid,
4798			&binder_proc_fops);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4799	}
4800
4801	return 0;
4802}
4803
4804static int binder_flush(struct file *filp, fl_owner_t id)
4805{
4806	struct binder_proc *proc = filp->private_data;
4807
4808	binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
4809
4810	return 0;
4811}
4812
4813static void binder_deferred_flush(struct binder_proc *proc)
4814{
4815	struct rb_node *n;
4816	int wake_count = 0;
4817
4818	binder_inner_proc_lock(proc);
4819	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
4820		struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
4821
4822		thread->looper_need_return = true;
4823		if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
4824			wake_up_interruptible(&thread->wait);
4825			wake_count++;
4826		}
4827	}
4828	binder_inner_proc_unlock(proc);
4829
4830	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
4831		     "binder_flush: %d woke %d threads\n", proc->pid,
4832		     wake_count);
4833}
4834
4835static int binder_release(struct inode *nodp, struct file *filp)
4836{
4837	struct binder_proc *proc = filp->private_data;
4838
4839	debugfs_remove(proc->debugfs_entry);
 
 
 
 
 
 
4840	binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
4841
4842	return 0;
4843}
4844
4845static int binder_node_release(struct binder_node *node, int refs)
4846{
4847	struct binder_ref *ref;
4848	int death = 0;
4849	struct binder_proc *proc = node->proc;
4850
4851	binder_release_work(proc, &node->async_todo);
4852
4853	binder_node_lock(node);
4854	binder_inner_proc_lock(proc);
4855	binder_dequeue_work_ilocked(&node->work);
4856	/*
4857	 * The caller must have taken a temporary ref on the node,
4858	 */
4859	BUG_ON(!node->tmp_refs);
4860	if (hlist_empty(&node->refs) && node->tmp_refs == 1) {
4861		binder_inner_proc_unlock(proc);
4862		binder_node_unlock(node);
4863		binder_free_node(node);
4864
4865		return refs;
4866	}
4867
4868	node->proc = NULL;
4869	node->local_strong_refs = 0;
4870	node->local_weak_refs = 0;
4871	binder_inner_proc_unlock(proc);
4872
4873	spin_lock(&binder_dead_nodes_lock);
4874	hlist_add_head(&node->dead_node, &binder_dead_nodes);
4875	spin_unlock(&binder_dead_nodes_lock);
4876
4877	hlist_for_each_entry(ref, &node->refs, node_entry) {
4878		refs++;
4879		/*
4880		 * Need the node lock to synchronize
4881		 * with new notification requests and the
4882		 * inner lock to synchronize with queued
4883		 * death notifications.
4884		 */
4885		binder_inner_proc_lock(ref->proc);
4886		if (!ref->death) {
4887			binder_inner_proc_unlock(ref->proc);
4888			continue;
4889		}
4890
4891		death++;
4892
4893		BUG_ON(!list_empty(&ref->death->work.entry));
4894		ref->death->work.type = BINDER_WORK_DEAD_BINDER;
4895		binder_enqueue_work_ilocked(&ref->death->work,
4896					    &ref->proc->todo);
4897		binder_wakeup_proc_ilocked(ref->proc);
4898		binder_inner_proc_unlock(ref->proc);
4899	}
4900
4901	binder_debug(BINDER_DEBUG_DEAD_BINDER,
4902		     "node %d now dead, refs %d, death %d\n",
4903		     node->debug_id, refs, death);
4904	binder_node_unlock(node);
4905	binder_put_node(node);
4906
4907	return refs;
4908}
4909
4910static void binder_deferred_release(struct binder_proc *proc)
4911{
4912	struct binder_context *context = proc->context;
4913	struct rb_node *n;
4914	int threads, nodes, incoming_refs, outgoing_refs, active_transactions;
4915
4916	BUG_ON(proc->files);
4917
4918	mutex_lock(&binder_procs_lock);
4919	hlist_del(&proc->proc_node);
4920	mutex_unlock(&binder_procs_lock);
4921
4922	mutex_lock(&context->context_mgr_node_lock);
4923	if (context->binder_context_mgr_node &&
4924	    context->binder_context_mgr_node->proc == proc) {
4925		binder_debug(BINDER_DEBUG_DEAD_BINDER,
4926			     "%s: %d context_mgr_node gone\n",
4927			     __func__, proc->pid);
4928		context->binder_context_mgr_node = NULL;
4929	}
4930	mutex_unlock(&context->context_mgr_node_lock);
4931	binder_inner_proc_lock(proc);
4932	/*
4933	 * Make sure proc stays alive after we
4934	 * remove all the threads
4935	 */
4936	proc->tmp_ref++;
4937
4938	proc->is_dead = true;
 
 
 
4939	threads = 0;
4940	active_transactions = 0;
4941	while ((n = rb_first(&proc->threads))) {
4942		struct binder_thread *thread;
4943
4944		thread = rb_entry(n, struct binder_thread, rb_node);
4945		binder_inner_proc_unlock(proc);
4946		threads++;
4947		active_transactions += binder_thread_release(proc, thread);
4948		binder_inner_proc_lock(proc);
4949	}
4950
4951	nodes = 0;
4952	incoming_refs = 0;
4953	while ((n = rb_first(&proc->nodes))) {
4954		struct binder_node *node;
4955
4956		node = rb_entry(n, struct binder_node, rb_node);
4957		nodes++;
4958		/*
4959		 * take a temporary ref on the node before
4960		 * calling binder_node_release() which will either
4961		 * kfree() the node or call binder_put_node()
4962		 */
4963		binder_inc_node_tmpref_ilocked(node);
4964		rb_erase(&node->rb_node, &proc->nodes);
4965		binder_inner_proc_unlock(proc);
4966		incoming_refs = binder_node_release(node, incoming_refs);
4967		binder_inner_proc_lock(proc);
4968	}
4969	binder_inner_proc_unlock(proc);
4970
4971	outgoing_refs = 0;
4972	binder_proc_lock(proc);
4973	while ((n = rb_first(&proc->refs_by_desc))) {
4974		struct binder_ref *ref;
4975
4976		ref = rb_entry(n, struct binder_ref, rb_node_desc);
4977		outgoing_refs++;
4978		binder_cleanup_ref_olocked(ref);
4979		binder_proc_unlock(proc);
4980		binder_free_ref(ref);
4981		binder_proc_lock(proc);
4982	}
4983	binder_proc_unlock(proc);
4984
4985	binder_release_work(proc, &proc->todo);
4986	binder_release_work(proc, &proc->delivered_death);
4987
4988	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
4989		     "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d\n",
4990		     __func__, proc->pid, threads, nodes, incoming_refs,
4991		     outgoing_refs, active_transactions);
4992
4993	binder_proc_dec_tmpref(proc);
4994}
4995
4996static void binder_deferred_func(struct work_struct *work)
4997{
4998	struct binder_proc *proc;
4999	struct files_struct *files;
5000
5001	int defer;
5002
5003	do {
5004		mutex_lock(&binder_deferred_lock);
5005		if (!hlist_empty(&binder_deferred_list)) {
5006			proc = hlist_entry(binder_deferred_list.first,
5007					struct binder_proc, deferred_work_node);
5008			hlist_del_init(&proc->deferred_work_node);
5009			defer = proc->deferred_work;
5010			proc->deferred_work = 0;
5011		} else {
5012			proc = NULL;
5013			defer = 0;
5014		}
5015		mutex_unlock(&binder_deferred_lock);
5016
5017		files = NULL;
5018		if (defer & BINDER_DEFERRED_PUT_FILES) {
5019			mutex_lock(&proc->files_lock);
5020			files = proc->files;
5021			if (files)
5022				proc->files = NULL;
5023			mutex_unlock(&proc->files_lock);
5024		}
5025
5026		if (defer & BINDER_DEFERRED_FLUSH)
5027			binder_deferred_flush(proc);
5028
5029		if (defer & BINDER_DEFERRED_RELEASE)
5030			binder_deferred_release(proc); /* frees proc */
5031
5032		if (files)
5033			put_files_struct(files);
5034	} while (proc);
5035}
5036static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
5037
5038static void
5039binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
5040{
5041	mutex_lock(&binder_deferred_lock);
5042	proc->deferred_work |= defer;
5043	if (hlist_unhashed(&proc->deferred_work_node)) {
5044		hlist_add_head(&proc->deferred_work_node,
5045				&binder_deferred_list);
5046		schedule_work(&binder_deferred_work);
5047	}
5048	mutex_unlock(&binder_deferred_lock);
5049}
5050
5051static void print_binder_transaction_ilocked(struct seq_file *m,
5052					     struct binder_proc *proc,
5053					     const char *prefix,
5054					     struct binder_transaction *t)
5055{
5056	struct binder_proc *to_proc;
5057	struct binder_buffer *buffer = t->buffer;
 
5058
5059	spin_lock(&t->lock);
5060	to_proc = t->to_proc;
5061	seq_printf(m,
5062		   "%s %d: %pK from %d:%d to %d:%d code %x flags %x pri %ld r%d",
5063		   prefix, t->debug_id, t,
5064		   t->from ? t->from->proc->pid : 0,
5065		   t->from ? t->from->pid : 0,
5066		   to_proc ? to_proc->pid : 0,
5067		   t->to_thread ? t->to_thread->pid : 0,
5068		   t->code, t->flags, t->priority, t->need_reply);
 
5069	spin_unlock(&t->lock);
5070
5071	if (proc != to_proc) {
5072		/*
5073		 * Can only safely deref buffer if we are holding the
5074		 * correct proc inner lock for this node
5075		 */
5076		seq_puts(m, "\n");
5077		return;
5078	}
5079
5080	if (buffer == NULL) {
5081		seq_puts(m, " buffer free\n");
5082		return;
5083	}
5084	if (buffer->target_node)
5085		seq_printf(m, " node %d", buffer->target_node->debug_id);
5086	seq_printf(m, " size %zd:%zd data %pK\n",
5087		   buffer->data_size, buffer->offsets_size,
5088		   buffer->data);
5089}
5090
5091static void print_binder_work_ilocked(struct seq_file *m,
5092				     struct binder_proc *proc,
5093				     const char *prefix,
5094				     const char *transaction_prefix,
5095				     struct binder_work *w)
5096{
5097	struct binder_node *node;
5098	struct binder_transaction *t;
5099
5100	switch (w->type) {
5101	case BINDER_WORK_TRANSACTION:
5102		t = container_of(w, struct binder_transaction, work);
5103		print_binder_transaction_ilocked(
5104				m, proc, transaction_prefix, t);
5105		break;
5106	case BINDER_WORK_RETURN_ERROR: {
5107		struct binder_error *e = container_of(
5108				w, struct binder_error, work);
5109
5110		seq_printf(m, "%stransaction error: %u\n",
5111			   prefix, e->cmd);
5112	} break;
5113	case BINDER_WORK_TRANSACTION_COMPLETE:
5114		seq_printf(m, "%stransaction complete\n", prefix);
5115		break;
5116	case BINDER_WORK_NODE:
5117		node = container_of(w, struct binder_node, work);
5118		seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
5119			   prefix, node->debug_id,
5120			   (u64)node->ptr, (u64)node->cookie);
5121		break;
5122	case BINDER_WORK_DEAD_BINDER:
5123		seq_printf(m, "%shas dead binder\n", prefix);
5124		break;
5125	case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
5126		seq_printf(m, "%shas cleared dead binder\n", prefix);
5127		break;
5128	case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
5129		seq_printf(m, "%shas cleared death notification\n", prefix);
5130		break;
5131	default:
5132		seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
5133		break;
5134	}
5135}
5136
5137static void print_binder_thread_ilocked(struct seq_file *m,
5138					struct binder_thread *thread,
5139					int print_always)
5140{
5141	struct binder_transaction *t;
5142	struct binder_work *w;
5143	size_t start_pos = m->count;
5144	size_t header_pos;
5145
5146	seq_printf(m, "  thread %d: l %02x need_return %d tr %d\n",
5147			thread->pid, thread->looper,
5148			thread->looper_need_return,
5149			atomic_read(&thread->tmp_ref));
5150	header_pos = m->count;
5151	t = thread->transaction_stack;
5152	while (t) {
5153		if (t->from == thread) {
5154			print_binder_transaction_ilocked(m, thread->proc,
5155					"    outgoing transaction", t);
5156			t = t->from_parent;
5157		} else if (t->to_thread == thread) {
5158			print_binder_transaction_ilocked(m, thread->proc,
5159						 "    incoming transaction", t);
5160			t = t->to_parent;
5161		} else {
5162			print_binder_transaction_ilocked(m, thread->proc,
5163					"    bad transaction", t);
5164			t = NULL;
5165		}
5166	}
5167	list_for_each_entry(w, &thread->todo, entry) {
5168		print_binder_work_ilocked(m, thread->proc, "    ",
5169					  "    pending transaction", w);
5170	}
5171	if (!print_always && m->count == header_pos)
5172		m->count = start_pos;
5173}
5174
5175static void print_binder_node_nilocked(struct seq_file *m,
5176				       struct binder_node *node)
5177{
5178	struct binder_ref *ref;
5179	struct binder_work *w;
5180	int count;
5181
5182	count = 0;
5183	hlist_for_each_entry(ref, &node->refs, node_entry)
5184		count++;
5185
5186	seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d tr %d",
5187		   node->debug_id, (u64)node->ptr, (u64)node->cookie,
5188		   node->has_strong_ref, node->has_weak_ref,
5189		   node->local_strong_refs, node->local_weak_refs,
5190		   node->internal_strong_refs, count, node->tmp_refs);
5191	if (count) {
5192		seq_puts(m, " proc");
5193		hlist_for_each_entry(ref, &node->refs, node_entry)
5194			seq_printf(m, " %d", ref->proc->pid);
5195	}
5196	seq_puts(m, "\n");
5197	if (node->proc) {
5198		list_for_each_entry(w, &node->async_todo, entry)
5199			print_binder_work_ilocked(m, node->proc, "    ",
5200					  "    pending async transaction", w);
5201	}
5202}
5203
5204static void print_binder_ref_olocked(struct seq_file *m,
5205				     struct binder_ref *ref)
5206{
5207	binder_node_lock(ref->node);
5208	seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %pK\n",
5209		   ref->data.debug_id, ref->data.desc,
5210		   ref->node->proc ? "" : "dead ",
5211		   ref->node->debug_id, ref->data.strong,
5212		   ref->data.weak, ref->death);
5213	binder_node_unlock(ref->node);
5214}
5215
5216static void print_binder_proc(struct seq_file *m,
5217			      struct binder_proc *proc, int print_all)
5218{
5219	struct binder_work *w;
5220	struct rb_node *n;
5221	size_t start_pos = m->count;
5222	size_t header_pos;
5223	struct binder_node *last_node = NULL;
5224
5225	seq_printf(m, "proc %d\n", proc->pid);
5226	seq_printf(m, "context %s\n", proc->context->name);
5227	header_pos = m->count;
5228
5229	binder_inner_proc_lock(proc);
5230	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
5231		print_binder_thread_ilocked(m, rb_entry(n, struct binder_thread,
5232						rb_node), print_all);
5233
5234	for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
5235		struct binder_node *node = rb_entry(n, struct binder_node,
5236						    rb_node);
 
 
 
5237		/*
5238		 * take a temporary reference on the node so it
5239		 * survives and isn't removed from the tree
5240		 * while we print it.
5241		 */
5242		binder_inc_node_tmpref_ilocked(node);
5243		/* Need to drop inner lock to take node lock */
5244		binder_inner_proc_unlock(proc);
5245		if (last_node)
5246			binder_put_node(last_node);
5247		binder_node_inner_lock(node);
5248		print_binder_node_nilocked(m, node);
5249		binder_node_inner_unlock(node);
5250		last_node = node;
5251		binder_inner_proc_lock(proc);
5252	}
5253	binder_inner_proc_unlock(proc);
5254	if (last_node)
5255		binder_put_node(last_node);
5256
5257	if (print_all) {
5258		binder_proc_lock(proc);
5259		for (n = rb_first(&proc->refs_by_desc);
5260		     n != NULL;
5261		     n = rb_next(n))
5262			print_binder_ref_olocked(m, rb_entry(n,
5263							    struct binder_ref,
5264							    rb_node_desc));
5265		binder_proc_unlock(proc);
5266	}
5267	binder_alloc_print_allocated(m, &proc->alloc);
5268	binder_inner_proc_lock(proc);
5269	list_for_each_entry(w, &proc->todo, entry)
5270		print_binder_work_ilocked(m, proc, "  ",
5271					  "  pending transaction", w);
5272	list_for_each_entry(w, &proc->delivered_death, entry) {
5273		seq_puts(m, "  has delivered dead binder\n");
5274		break;
5275	}
5276	binder_inner_proc_unlock(proc);
5277	if (!print_all && m->count == header_pos)
5278		m->count = start_pos;
5279}
5280
5281static const char * const binder_return_strings[] = {
5282	"BR_ERROR",
5283	"BR_OK",
5284	"BR_TRANSACTION",
5285	"BR_REPLY",
5286	"BR_ACQUIRE_RESULT",
5287	"BR_DEAD_REPLY",
5288	"BR_TRANSACTION_COMPLETE",
5289	"BR_INCREFS",
5290	"BR_ACQUIRE",
5291	"BR_RELEASE",
5292	"BR_DECREFS",
5293	"BR_ATTEMPT_ACQUIRE",
5294	"BR_NOOP",
5295	"BR_SPAWN_LOOPER",
5296	"BR_FINISHED",
5297	"BR_DEAD_BINDER",
5298	"BR_CLEAR_DEATH_NOTIFICATION_DONE",
5299	"BR_FAILED_REPLY"
 
 
 
5300};
5301
5302static const char * const binder_command_strings[] = {
5303	"BC_TRANSACTION",
5304	"BC_REPLY",
5305	"BC_ACQUIRE_RESULT",
5306	"BC_FREE_BUFFER",
5307	"BC_INCREFS",
5308	"BC_ACQUIRE",
5309	"BC_RELEASE",
5310	"BC_DECREFS",
5311	"BC_INCREFS_DONE",
5312	"BC_ACQUIRE_DONE",
5313	"BC_ATTEMPT_ACQUIRE",
5314	"BC_REGISTER_LOOPER",
5315	"BC_ENTER_LOOPER",
5316	"BC_EXIT_LOOPER",
5317	"BC_REQUEST_DEATH_NOTIFICATION",
5318	"BC_CLEAR_DEATH_NOTIFICATION",
5319	"BC_DEAD_BINDER_DONE",
5320	"BC_TRANSACTION_SG",
5321	"BC_REPLY_SG",
5322};
5323
5324static const char * const binder_objstat_strings[] = {
5325	"proc",
5326	"thread",
5327	"node",
5328	"ref",
5329	"death",
5330	"transaction",
5331	"transaction_complete"
5332};
5333
5334static void print_binder_stats(struct seq_file *m, const char *prefix,
5335			       struct binder_stats *stats)
5336{
5337	int i;
5338
5339	BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
5340		     ARRAY_SIZE(binder_command_strings));
5341	for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
5342		int temp = atomic_read(&stats->bc[i]);
5343
5344		if (temp)
5345			seq_printf(m, "%s%s: %d\n", prefix,
5346				   binder_command_strings[i], temp);
5347	}
5348
5349	BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
5350		     ARRAY_SIZE(binder_return_strings));
5351	for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
5352		int temp = atomic_read(&stats->br[i]);
5353
5354		if (temp)
5355			seq_printf(m, "%s%s: %d\n", prefix,
5356				   binder_return_strings[i], temp);
5357	}
5358
5359	BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
5360		     ARRAY_SIZE(binder_objstat_strings));
5361	BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
5362		     ARRAY_SIZE(stats->obj_deleted));
5363	for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
5364		int created = atomic_read(&stats->obj_created[i]);
5365		int deleted = atomic_read(&stats->obj_deleted[i]);
5366
5367		if (created || deleted)
5368			seq_printf(m, "%s%s: active %d total %d\n",
5369				prefix,
5370				binder_objstat_strings[i],
5371				created - deleted,
5372				created);
5373	}
5374}
5375
5376static void print_binder_proc_stats(struct seq_file *m,
5377				    struct binder_proc *proc)
5378{
5379	struct binder_work *w;
5380	struct binder_thread *thread;
5381	struct rb_node *n;
5382	int count, strong, weak, ready_threads;
5383	size_t free_async_space =
5384		binder_alloc_get_free_async_space(&proc->alloc);
5385
5386	seq_printf(m, "proc %d\n", proc->pid);
5387	seq_printf(m, "context %s\n", proc->context->name);
5388	count = 0;
5389	ready_threads = 0;
5390	binder_inner_proc_lock(proc);
5391	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
5392		count++;
5393
5394	list_for_each_entry(thread, &proc->waiting_threads, waiting_thread_node)
5395		ready_threads++;
5396
5397	seq_printf(m, "  threads: %d\n", count);
5398	seq_printf(m, "  requested threads: %d+%d/%d\n"
5399			"  ready threads %d\n"
5400			"  free async space %zd\n", proc->requested_threads,
5401			proc->requested_threads_started, proc->max_threads,
5402			ready_threads,
5403			free_async_space);
5404	count = 0;
5405	for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
5406		count++;
5407	binder_inner_proc_unlock(proc);
5408	seq_printf(m, "  nodes: %d\n", count);
5409	count = 0;
5410	strong = 0;
5411	weak = 0;
5412	binder_proc_lock(proc);
5413	for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
5414		struct binder_ref *ref = rb_entry(n, struct binder_ref,
5415						  rb_node_desc);
5416		count++;
5417		strong += ref->data.strong;
5418		weak += ref->data.weak;
5419	}
5420	binder_proc_unlock(proc);
5421	seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
5422
5423	count = binder_alloc_get_allocated_count(&proc->alloc);
5424	seq_printf(m, "  buffers: %d\n", count);
5425
5426	binder_alloc_print_pages(m, &proc->alloc);
5427
5428	count = 0;
5429	binder_inner_proc_lock(proc);
5430	list_for_each_entry(w, &proc->todo, entry) {
5431		if (w->type == BINDER_WORK_TRANSACTION)
5432			count++;
5433	}
5434	binder_inner_proc_unlock(proc);
5435	seq_printf(m, "  pending transactions: %d\n", count);
5436
5437	print_binder_stats(m, "  ", &proc->stats);
5438}
5439
5440
5441static int binder_state_show(struct seq_file *m, void *unused)
5442{
5443	struct binder_proc *proc;
5444	struct binder_node *node;
5445	struct binder_node *last_node = NULL;
5446
5447	seq_puts(m, "binder state:\n");
5448
5449	spin_lock(&binder_dead_nodes_lock);
5450	if (!hlist_empty(&binder_dead_nodes))
5451		seq_puts(m, "dead nodes:\n");
5452	hlist_for_each_entry(node, &binder_dead_nodes, dead_node) {
5453		/*
5454		 * take a temporary reference on the node so it
5455		 * survives and isn't removed from the list
5456		 * while we print it.
5457		 */
5458		node->tmp_refs++;
5459		spin_unlock(&binder_dead_nodes_lock);
5460		if (last_node)
5461			binder_put_node(last_node);
5462		binder_node_lock(node);
5463		print_binder_node_nilocked(m, node);
5464		binder_node_unlock(node);
5465		last_node = node;
5466		spin_lock(&binder_dead_nodes_lock);
5467	}
5468	spin_unlock(&binder_dead_nodes_lock);
5469	if (last_node)
5470		binder_put_node(last_node);
5471
5472	mutex_lock(&binder_procs_lock);
5473	hlist_for_each_entry(proc, &binder_procs, proc_node)
5474		print_binder_proc(m, proc, 1);
5475	mutex_unlock(&binder_procs_lock);
5476
5477	return 0;
5478}
5479
5480static int binder_stats_show(struct seq_file *m, void *unused)
5481{
5482	struct binder_proc *proc;
5483
5484	seq_puts(m, "binder stats:\n");
5485
5486	print_binder_stats(m, "", &binder_stats);
5487
5488	mutex_lock(&binder_procs_lock);
5489	hlist_for_each_entry(proc, &binder_procs, proc_node)
5490		print_binder_proc_stats(m, proc);
5491	mutex_unlock(&binder_procs_lock);
5492
5493	return 0;
5494}
5495
5496static int binder_transactions_show(struct seq_file *m, void *unused)
5497{
5498	struct binder_proc *proc;
5499
5500	seq_puts(m, "binder transactions:\n");
5501	mutex_lock(&binder_procs_lock);
5502	hlist_for_each_entry(proc, &binder_procs, proc_node)
5503		print_binder_proc(m, proc, 0);
5504	mutex_unlock(&binder_procs_lock);
5505
5506	return 0;
5507}
5508
5509static int binder_proc_show(struct seq_file *m, void *unused)
5510{
5511	struct binder_proc *itr;
5512	int pid = (unsigned long)m->private;
5513
5514	mutex_lock(&binder_procs_lock);
5515	hlist_for_each_entry(itr, &binder_procs, proc_node) {
5516		if (itr->pid == pid) {
5517			seq_puts(m, "binder proc state:\n");
5518			print_binder_proc(m, itr, 1);
5519		}
5520	}
5521	mutex_unlock(&binder_procs_lock);
5522
5523	return 0;
5524}
5525
5526static void print_binder_transaction_log_entry(struct seq_file *m,
5527					struct binder_transaction_log_entry *e)
5528{
5529	int debug_id = READ_ONCE(e->debug_id_done);
5530	/*
5531	 * read barrier to guarantee debug_id_done read before
5532	 * we print the log values
5533	 */
5534	smp_rmb();
5535	seq_printf(m,
5536		   "%d: %s from %d:%d to %d:%d context %s node %d handle %d size %d:%d ret %d/%d l=%d",
5537		   e->debug_id, (e->call_type == 2) ? "reply" :
5538		   ((e->call_type == 1) ? "async" : "call "), e->from_proc,
5539		   e->from_thread, e->to_proc, e->to_thread, e->context_name,
5540		   e->to_node, e->target_handle, e->data_size, e->offsets_size,
5541		   e->return_error, e->return_error_param,
5542		   e->return_error_line);
5543	/*
5544	 * read-barrier to guarantee read of debug_id_done after
5545	 * done printing the fields of the entry
5546	 */
5547	smp_rmb();
5548	seq_printf(m, debug_id && debug_id == READ_ONCE(e->debug_id_done) ?
5549			"\n" : " (incomplete)\n");
5550}
5551
5552static int binder_transaction_log_show(struct seq_file *m, void *unused)
5553{
5554	struct binder_transaction_log *log = m->private;
5555	unsigned int log_cur = atomic_read(&log->cur);
5556	unsigned int count;
5557	unsigned int cur;
5558	int i;
5559
5560	count = log_cur + 1;
5561	cur = count < ARRAY_SIZE(log->entry) && !log->full ?
5562		0 : count % ARRAY_SIZE(log->entry);
5563	if (count > ARRAY_SIZE(log->entry) || log->full)
5564		count = ARRAY_SIZE(log->entry);
5565	for (i = 0; i < count; i++) {
5566		unsigned int index = cur++ % ARRAY_SIZE(log->entry);
5567
5568		print_binder_transaction_log_entry(m, &log->entry[index]);
5569	}
5570	return 0;
5571}
5572
5573static const struct file_operations binder_fops = {
5574	.owner = THIS_MODULE,
5575	.poll = binder_poll,
5576	.unlocked_ioctl = binder_ioctl,
5577	.compat_ioctl = binder_ioctl,
5578	.mmap = binder_mmap,
5579	.open = binder_open,
5580	.flush = binder_flush,
5581	.release = binder_release,
5582};
5583
5584BINDER_DEBUG_ENTRY(state);
5585BINDER_DEBUG_ENTRY(stats);
5586BINDER_DEBUG_ENTRY(transactions);
5587BINDER_DEBUG_ENTRY(transaction_log);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5588
5589static int __init init_binder_device(const char *name)
5590{
5591	int ret;
5592	struct binder_device *binder_device;
5593
5594	binder_device = kzalloc(sizeof(*binder_device), GFP_KERNEL);
5595	if (!binder_device)
5596		return -ENOMEM;
5597
5598	binder_device->miscdev.fops = &binder_fops;
5599	binder_device->miscdev.minor = MISC_DYNAMIC_MINOR;
5600	binder_device->miscdev.name = name;
5601
 
5602	binder_device->context.binder_context_mgr_uid = INVALID_UID;
5603	binder_device->context.name = name;
5604	mutex_init(&binder_device->context.context_mgr_node_lock);
5605
5606	ret = misc_register(&binder_device->miscdev);
5607	if (ret < 0) {
5608		kfree(binder_device);
5609		return ret;
5610	}
5611
5612	hlist_add_head(&binder_device->hlist, &binder_devices);
5613
5614	return ret;
5615}
5616
5617static int __init binder_init(void)
5618{
5619	int ret;
5620	char *device_name, *device_names, *device_tmp;
5621	struct binder_device *device;
5622	struct hlist_node *tmp;
 
 
5623
5624	ret = binder_alloc_shrinker_init();
5625	if (ret)
5626		return ret;
5627
5628	atomic_set(&binder_transaction_log.cur, ~0U);
5629	atomic_set(&binder_transaction_log_failed.cur, ~0U);
5630
5631	binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
5632	if (binder_debugfs_dir_entry_root)
5633		binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
5634						 binder_debugfs_dir_entry_root);
5635
5636	if (binder_debugfs_dir_entry_root) {
5637		debugfs_create_file("state",
5638				    0444,
5639				    binder_debugfs_dir_entry_root,
5640				    NULL,
5641				    &binder_state_fops);
5642		debugfs_create_file("stats",
5643				    0444,
5644				    binder_debugfs_dir_entry_root,
5645				    NULL,
5646				    &binder_stats_fops);
5647		debugfs_create_file("transactions",
5648				    0444,
5649				    binder_debugfs_dir_entry_root,
5650				    NULL,
5651				    &binder_transactions_fops);
5652		debugfs_create_file("transaction_log",
5653				    0444,
5654				    binder_debugfs_dir_entry_root,
5655				    &binder_transaction_log,
5656				    &binder_transaction_log_fops);
5657		debugfs_create_file("failed_transaction_log",
5658				    0444,
5659				    binder_debugfs_dir_entry_root,
5660				    &binder_transaction_log_failed,
5661				    &binder_transaction_log_fops);
5662	}
5663
5664	/*
5665	 * Copy the module_parameter string, because we don't want to
5666	 * tokenize it in-place.
5667	 */
5668	device_names = kzalloc(strlen(binder_devices_param) + 1, GFP_KERNEL);
5669	if (!device_names) {
5670		ret = -ENOMEM;
5671		goto err_alloc_device_names_failed;
5672	}
5673	strcpy(device_names, binder_devices_param);
5674
5675	device_tmp = device_names;
5676	while ((device_name = strsep(&device_tmp, ","))) {
5677		ret = init_binder_device(device_name);
5678		if (ret)
5679			goto err_init_binder_device_failed;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5680	}
5681
 
 
 
 
5682	return ret;
5683
5684err_init_binder_device_failed:
5685	hlist_for_each_entry_safe(device, tmp, &binder_devices, hlist) {
5686		misc_deregister(&device->miscdev);
5687		hlist_del(&device->hlist);
5688		kfree(device);
5689	}
5690
5691	kfree(device_names);
5692
5693err_alloc_device_names_failed:
5694	debugfs_remove_recursive(binder_debugfs_dir_entry_root);
 
5695
5696	return ret;
5697}
5698
5699device_initcall(binder_init);
5700
5701#define CREATE_TRACE_POINTS
5702#include "binder_trace.h"
5703
5704MODULE_LICENSE("GPL v2");