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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20#include <asm/cacheflush.h>
  21#include <linux/fdtable.h>
  22#include <linux/file.h>
  23#include <linux/freezer.h>
  24#include <linux/fs.h>
  25#include <linux/list.h>
  26#include <linux/miscdevice.h>
  27#include <linux/mm.h>
  28#include <linux/module.h>
  29#include <linux/mutex.h>
  30#include <linux/nsproxy.h>
  31#include <linux/poll.h>
  32#include <linux/debugfs.h>
  33#include <linux/rbtree.h>
  34#include <linux/sched.h>
 
  35#include <linux/seq_file.h>
 
  36#include <linux/uaccess.h>
  37#include <linux/vmalloc.h>
  38#include <linux/slab.h>
  39#include <linux/pid_namespace.h>
  40#include <linux/security.h>
  41
  42#ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
  43#define BINDER_IPC_32BIT 1
  44#endif
  45
  46#include <uapi/linux/android/binder.h>
 
 
 
 
 
 
  47#include "binder_trace.h"
  48
  49static DEFINE_MUTEX(binder_main_lock);
  50static DEFINE_MUTEX(binder_deferred_lock);
  51static DEFINE_MUTEX(binder_mmap_lock);
  52
 
  53static HLIST_HEAD(binder_procs);
  54static HLIST_HEAD(binder_deferred_list);
 
  55static HLIST_HEAD(binder_dead_nodes);
 
  56
  57static struct dentry *binder_debugfs_dir_entry_root;
  58static struct dentry *binder_debugfs_dir_entry_proc;
  59static struct binder_node *binder_context_mgr_node;
  60static kuid_t binder_context_mgr_uid = INVALID_UID;
  61static int binder_last_id;
  62static struct workqueue_struct *binder_deferred_workqueue;
  63
  64#define BINDER_DEBUG_ENTRY(name) \
  65static int binder_##name##_open(struct inode *inode, struct file *file) \
  66{ \
  67	return single_open(file, binder_##name##_show, inode->i_private); \
  68} \
  69\
  70static const struct file_operations binder_##name##_fops = { \
  71	.owner = THIS_MODULE, \
  72	.open = binder_##name##_open, \
  73	.read = seq_read, \
  74	.llseek = seq_lseek, \
  75	.release = single_release, \
  76}
  77
  78static int binder_proc_show(struct seq_file *m, void *unused);
  79BINDER_DEBUG_ENTRY(proc);
  80
  81/* This is only defined in include/asm-arm/sizes.h */
  82#ifndef SZ_1K
  83#define SZ_1K                               0x400
  84#endif
  85
  86#ifndef SZ_4M
  87#define SZ_4M                               0x400000
  88#endif
  89
  90#define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  91
  92#define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  93
  94enum {
  95	BINDER_DEBUG_USER_ERROR             = 1U << 0,
  96	BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  97	BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  98	BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  99	BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
 100	BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
 101	BINDER_DEBUG_READ_WRITE             = 1U << 6,
 102	BINDER_DEBUG_USER_REFS              = 1U << 7,
 103	BINDER_DEBUG_THREADS                = 1U << 8,
 104	BINDER_DEBUG_TRANSACTION            = 1U << 9,
 105	BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
 106	BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
 107	BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
 108	BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
 109	BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
 110	BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
 111};
 112static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 113	BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 114module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
 115
 116static bool binder_debug_no_lock;
 117module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
 118
 119static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 120static int binder_stop_on_user_error;
 121
 122static int binder_set_stop_on_user_error(const char *val,
 123					 struct kernel_param *kp)
 124{
 125	int ret;
 126
 127	ret = param_set_int(val, kp);
 128	if (binder_stop_on_user_error < 2)
 129		wake_up(&binder_user_error_wait);
 130	return ret;
 131}
 132module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 133	param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 134
 135#define binder_debug(mask, x...) \
 136	do { \
 137		if (binder_debug_mask & mask) \
 138			pr_info(x); \
 139	} while (0)
 140
 141#define binder_user_error(x...) \
 142	do { \
 143		if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 144			pr_info(x); \
 145		if (binder_stop_on_user_error) \
 146			binder_stop_on_user_error = 2; \
 147	} while (0)
 148
 
 
 
 
 
 
 
 
 
 
 
 149enum binder_stat_types {
 150	BINDER_STAT_PROC,
 151	BINDER_STAT_THREAD,
 152	BINDER_STAT_NODE,
 153	BINDER_STAT_REF,
 154	BINDER_STAT_DEATH,
 155	BINDER_STAT_TRANSACTION,
 156	BINDER_STAT_TRANSACTION_COMPLETE,
 157	BINDER_STAT_COUNT
 158};
 159
 160struct binder_stats {
 161	int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 162	int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
 163	int obj_created[BINDER_STAT_COUNT];
 164	int obj_deleted[BINDER_STAT_COUNT];
 165};
 166
 167static struct binder_stats binder_stats;
 168
 169static inline void binder_stats_deleted(enum binder_stat_types type)
 170{
 171	binder_stats.obj_deleted[type]++;
 172}
 173
 174static inline void binder_stats_created(enum binder_stat_types type)
 175{
 176	binder_stats.obj_created[type]++;
 177}
 178
 179struct binder_transaction_log_entry {
 180	int debug_id;
 181	int call_type;
 182	int from_proc;
 183	int from_thread;
 184	int target_handle;
 185	int to_proc;
 186	int to_thread;
 187	int to_node;
 188	int data_size;
 189	int offsets_size;
 190};
 191struct binder_transaction_log {
 192	int next;
 193	int full;
 194	struct binder_transaction_log_entry entry[32];
 195};
 196static struct binder_transaction_log binder_transaction_log;
 197static struct binder_transaction_log binder_transaction_log_failed;
 198
 199static struct binder_transaction_log_entry *binder_transaction_log_add(
 200	struct binder_transaction_log *log)
 201{
 202	struct binder_transaction_log_entry *e;
 
 203
 204	e = &log->entry[log->next];
 
 
 
 
 
 
 
 
 
 205	memset(e, 0, sizeof(*e));
 206	log->next++;
 207	if (log->next == ARRAY_SIZE(log->entry)) {
 208		log->next = 0;
 209		log->full = 1;
 210	}
 211	return e;
 212}
 213
 
 
 
 
 
 
 
 214struct binder_work {
 215	struct list_head entry;
 
 216	enum {
 217		BINDER_WORK_TRANSACTION = 1,
 218		BINDER_WORK_TRANSACTION_COMPLETE,
 
 219		BINDER_WORK_NODE,
 220		BINDER_WORK_DEAD_BINDER,
 221		BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 222		BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 223	} type;
 224};
 225
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 226struct binder_node {
 227	int debug_id;
 
 228	struct binder_work work;
 229	union {
 230		struct rb_node rb_node;
 231		struct hlist_node dead_node;
 232	};
 233	struct binder_proc *proc;
 234	struct hlist_head refs;
 235	int internal_strong_refs;
 236	int local_weak_refs;
 237	int local_strong_refs;
 
 238	binder_uintptr_t ptr;
 239	binder_uintptr_t cookie;
 240	unsigned has_strong_ref:1;
 241	unsigned pending_strong_ref:1;
 242	unsigned has_weak_ref:1;
 243	unsigned pending_weak_ref:1;
 244	unsigned has_async_transaction:1;
 245	unsigned accept_fds:1;
 246	unsigned min_priority:8;
 
 
 
 
 
 
 
 
 
 
 
 
 247	struct list_head async_todo;
 248};
 249
 250struct binder_ref_death {
 
 
 
 
 
 251	struct binder_work work;
 252	binder_uintptr_t cookie;
 253};
 254
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 255struct binder_ref {
 256	/* Lookups needed: */
 257	/*   node + proc => ref (transaction) */
 258	/*   desc + proc => ref (transaction, inc/dec ref) */
 259	/*   node => refs + procs (proc exit) */
 260	int debug_id;
 261	struct rb_node rb_node_desc;
 262	struct rb_node rb_node_node;
 263	struct hlist_node node_entry;
 264	struct binder_proc *proc;
 265	struct binder_node *node;
 266	uint32_t desc;
 267	int strong;
 268	int weak;
 269	struct binder_ref_death *death;
 270};
 271
 272struct binder_buffer {
 273	struct list_head entry; /* free and allocated entries by address */
 274	struct rb_node rb_node; /* free entry by size or allocated entry */
 275				/* by address */
 276	unsigned free:1;
 277	unsigned allow_user_free:1;
 278	unsigned async_transaction:1;
 279	unsigned debug_id:29;
 280
 281	struct binder_transaction *transaction;
 282
 283	struct binder_node *target_node;
 284	size_t data_size;
 285	size_t offsets_size;
 286	uint8_t data[0];
 287};
 288
 289enum binder_deferred_state {
 290	BINDER_DEFERRED_PUT_FILES    = 0x01,
 291	BINDER_DEFERRED_FLUSH        = 0x02,
 292	BINDER_DEFERRED_RELEASE      = 0x04,
 293};
 294
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 295struct binder_proc {
 296	struct hlist_node proc_node;
 297	struct rb_root threads;
 298	struct rb_root nodes;
 299	struct rb_root refs_by_desc;
 300	struct rb_root refs_by_node;
 
 301	int pid;
 302	struct vm_area_struct *vma;
 303	struct mm_struct *vma_vm_mm;
 304	struct task_struct *tsk;
 305	struct files_struct *files;
 306	struct hlist_node deferred_work_node;
 307	int deferred_work;
 308	void *buffer;
 309	ptrdiff_t user_buffer_offset;
 310
 311	struct list_head buffers;
 312	struct rb_root free_buffers;
 313	struct rb_root allocated_buffers;
 314	size_t free_async_space;
 315
 316	struct page **pages;
 317	size_t buffer_size;
 318	uint32_t buffer_free;
 319	struct list_head todo;
 320	wait_queue_head_t wait;
 321	struct binder_stats stats;
 322	struct list_head delivered_death;
 323	int max_threads;
 324	int requested_threads;
 325	int requested_threads_started;
 326	int ready_threads;
 327	long default_priority;
 328	struct dentry *debugfs_entry;
 
 
 
 
 
 329};
 330
 331enum {
 332	BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 333	BINDER_LOOPER_STATE_ENTERED     = 0x02,
 334	BINDER_LOOPER_STATE_EXITED      = 0x04,
 335	BINDER_LOOPER_STATE_INVALID     = 0x08,
 336	BINDER_LOOPER_STATE_WAITING     = 0x10,
 337	BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 338};
 339
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 340struct binder_thread {
 341	struct binder_proc *proc;
 342	struct rb_node rb_node;
 
 343	int pid;
 344	int looper;
 
 345	struct binder_transaction *transaction_stack;
 346	struct list_head todo;
 347	uint32_t return_error; /* Write failed, return error code in read buf */
 348	uint32_t return_error2; /* Write failed, return error code in read */
 349		/* buffer. Used when sending a reply to a dead process that */
 350		/* we are also waiting on */
 351	wait_queue_head_t wait;
 352	struct binder_stats stats;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 353};
 354
 355struct binder_transaction {
 356	int debug_id;
 357	struct binder_work work;
 358	struct binder_thread *from;
 359	struct binder_transaction *from_parent;
 360	struct binder_proc *to_proc;
 361	struct binder_thread *to_thread;
 362	struct binder_transaction *to_parent;
 363	unsigned need_reply:1;
 364	/* unsigned is_dead:1; */	/* not used at the moment */
 365
 366	struct binder_buffer *buffer;
 367	unsigned int	code;
 368	unsigned int	flags;
 369	long	priority;
 370	long	saved_priority;
 371	kuid_t	sender_euid;
 
 
 
 
 
 
 
 
 
 372};
 373
 374static void
 375binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 376
 377static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 
 
 
 
 
 
 
 
 
 
 378{
 379	struct files_struct *files = proc->files;
 380	unsigned long rlim_cur;
 381	unsigned long irqs;
 382
 383	if (files == NULL)
 384		return -ESRCH;
 385
 386	if (!lock_task_sighand(proc->tsk, &irqs))
 387		return -EMFILE;
 388
 389	rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 390	unlock_task_sighand(proc->tsk, &irqs);
 391
 392	return __alloc_fd(files, 0, rlim_cur, flags);
 393}
 394
 395/*
 396 * copied from fd_install
 
 
 
 397 */
 398static void task_fd_install(
 399	struct binder_proc *proc, unsigned int fd, struct file *file)
 
 
 400{
 401	if (proc->files)
 402		__fd_install(proc->files, fd, file);
 
 403}
 404
 405/*
 406 * copied from sys_close
 
 
 
 407 */
 408static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 
 
 
 409{
 410	int retval;
 411
 412	if (proc->files == NULL)
 413		return -ESRCH;
 414
 415	retval = __close_fd(proc->files, fd);
 416	/* can't restart close syscall because file table entry was cleared */
 417	if (unlikely(retval == -ERESTARTSYS ||
 418		     retval == -ERESTARTNOINTR ||
 419		     retval == -ERESTARTNOHAND ||
 420		     retval == -ERESTART_RESTARTBLOCK))
 421		retval = -EINTR;
 422
 423	return retval;
 424}
 425
 426static inline void binder_lock(const char *tag)
 
 
 
 
 
 
 
 
 
 427{
 428	trace_binder_lock(tag);
 429	mutex_lock(&binder_main_lock);
 430	trace_binder_locked(tag);
 431}
 432
 433static inline void binder_unlock(const char *tag)
 
 
 
 
 
 
 
 
 
 434{
 435	trace_binder_unlock(tag);
 436	mutex_unlock(&binder_main_lock);
 
 437}
 438
 439static void binder_set_nice(long nice)
 
 
 
 
 
 
 
 
 
 440{
 441	long min_nice;
 442
 443	if (can_nice(current, nice)) {
 444		set_user_nice(current, nice);
 445		return;
 446	}
 447	min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
 448	binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 449		     "%d: nice value %ld not allowed use %ld instead\n",
 450		      current->pid, nice, min_nice);
 451	set_user_nice(current, min_nice);
 452	if (min_nice <= MAX_NICE)
 453		return;
 454	binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
 455}
 456
 457static size_t binder_buffer_size(struct binder_proc *proc,
 458				 struct binder_buffer *buffer)
 
 
 
 
 
 
 
 
 
 459{
 460	if (list_is_last(&buffer->entry, &proc->buffers))
 461		return proc->buffer + proc->buffer_size - (void *)buffer->data;
 462	return (size_t)list_entry(buffer->entry.next,
 463			  struct binder_buffer, entry) - (size_t)buffer->data;
 
 
 
 
 464}
 465
 466static void binder_insert_free_buffer(struct binder_proc *proc,
 467				      struct binder_buffer *new_buffer)
 
 
 
 
 
 
 
 
 468{
 469	struct rb_node **p = &proc->free_buffers.rb_node;
 470	struct rb_node *parent = NULL;
 471	struct binder_buffer *buffer;
 472	size_t buffer_size;
 473	size_t new_buffer_size;
 474
 475	BUG_ON(!new_buffer->free);
 476
 477	new_buffer_size = binder_buffer_size(proc, new_buffer);
 478
 479	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 480		     "%d: add free buffer, size %zd, at %p\n",
 481		      proc->pid, new_buffer_size, new_buffer);
 482
 483	while (*p) {
 484		parent = *p;
 485		buffer = rb_entry(parent, struct binder_buffer, rb_node);
 486		BUG_ON(!buffer->free);
 487
 488		buffer_size = binder_buffer_size(proc, buffer);
 489
 490		if (new_buffer_size < buffer_size)
 491			p = &parent->rb_left;
 492		else
 493			p = &parent->rb_right;
 494	}
 495	rb_link_node(&new_buffer->rb_node, parent, p);
 496	rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 497}
 498
 499static void binder_insert_allocated_buffer(struct binder_proc *proc,
 500					   struct binder_buffer *new_buffer)
 501{
 502	struct rb_node **p = &proc->allocated_buffers.rb_node;
 503	struct rb_node *parent = NULL;
 504	struct binder_buffer *buffer;
 505
 506	BUG_ON(new_buffer->free);
 507
 508	while (*p) {
 509		parent = *p;
 510		buffer = rb_entry(parent, struct binder_buffer, rb_node);
 511		BUG_ON(buffer->free);
 512
 513		if (new_buffer < buffer)
 514			p = &parent->rb_left;
 515		else if (new_buffer > buffer)
 516			p = &parent->rb_right;
 517		else
 518			BUG();
 519	}
 520	rb_link_node(&new_buffer->rb_node, parent, p);
 521	rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 522}
 523
 524static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 525						  uintptr_t user_ptr)
 
 
 
 
 
 
 
 526{
 527	struct rb_node *n = proc->allocated_buffers.rb_node;
 528	struct binder_buffer *buffer;
 529	struct binder_buffer *kern_ptr;
 530
 531	kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
 532		- offsetof(struct binder_buffer, data));
 533
 534	while (n) {
 535		buffer = rb_entry(n, struct binder_buffer, rb_node);
 536		BUG_ON(buffer->free);
 537
 538		if (kern_ptr < buffer)
 539			n = n->rb_left;
 540		else if (kern_ptr > buffer)
 541			n = n->rb_right;
 542		else
 543			return buffer;
 544	}
 545	return NULL;
 546}
 547
 548static int binder_update_page_range(struct binder_proc *proc, int allocate,
 549				    void *start, void *end,
 550				    struct vm_area_struct *vma)
 551{
 552	void *page_addr;
 553	unsigned long user_page_addr;
 554	struct page **page;
 555	struct mm_struct *mm;
 556
 557	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 558		     "%d: %s pages %p-%p\n", proc->pid,
 559		     allocate ? "allocate" : "free", start, end);
 560
 561	if (end <= start)
 562		return 0;
 563
 564	trace_binder_update_page_range(proc, allocate, start, end);
 565
 566	if (vma)
 567		mm = NULL;
 568	else
 569		mm = get_task_mm(proc->tsk);
 570
 571	if (mm) {
 572		down_write(&mm->mmap_sem);
 573		vma = proc->vma;
 574		if (vma && mm != proc->vma_vm_mm) {
 575			pr_err("%d: vma mm and task mm mismatch\n",
 576				proc->pid);
 577			vma = NULL;
 578		}
 579	}
 580
 581	if (allocate == 0)
 582		goto free_range;
 583
 584	if (vma == NULL) {
 585		pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
 586			proc->pid);
 587		goto err_no_vma;
 588	}
 589
 590	for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 591		int ret;
 592
 593		page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 594
 595		BUG_ON(*page);
 596		*page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 597		if (*page == NULL) {
 598			pr_err("%d: binder_alloc_buf failed for page at %p\n",
 599				proc->pid, page_addr);
 600			goto err_alloc_page_failed;
 601		}
 602		ret = map_kernel_range_noflush((unsigned long)page_addr,
 603					PAGE_SIZE, PAGE_KERNEL, page);
 604		flush_cache_vmap((unsigned long)page_addr,
 605				(unsigned long)page_addr + PAGE_SIZE);
 606		if (ret != 1) {
 607			pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
 608			       proc->pid, page_addr);
 609			goto err_map_kernel_failed;
 610		}
 611		user_page_addr =
 612			(uintptr_t)page_addr + proc->user_buffer_offset;
 613		ret = vm_insert_page(vma, user_page_addr, page[0]);
 614		if (ret) {
 615			pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
 616			       proc->pid, user_page_addr);
 617			goto err_vm_insert_page_failed;
 618		}
 619		/* vm_insert_page does not seem to increment the refcount */
 620	}
 621	if (mm) {
 622		up_write(&mm->mmap_sem);
 623		mmput(mm);
 624	}
 625	return 0;
 626
 627free_range:
 628	for (page_addr = end - PAGE_SIZE; page_addr >= start;
 629	     page_addr -= PAGE_SIZE) {
 630		page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 631		if (vma)
 632			zap_page_range(vma, (uintptr_t)page_addr +
 633				proc->user_buffer_offset, PAGE_SIZE, NULL);
 634err_vm_insert_page_failed:
 635		unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 636err_map_kernel_failed:
 637		__free_page(*page);
 638		*page = NULL;
 639err_alloc_page_failed:
 640		;
 641	}
 642err_no_vma:
 643	if (mm) {
 644		up_write(&mm->mmap_sem);
 645		mmput(mm);
 646	}
 647	return -ENOMEM;
 648}
 649
 650static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 651					      size_t data_size,
 652					      size_t offsets_size, int is_async)
 653{
 654	struct rb_node *n = proc->free_buffers.rb_node;
 655	struct binder_buffer *buffer;
 656	size_t buffer_size;
 657	struct rb_node *best_fit = NULL;
 658	void *has_page_addr;
 659	void *end_page_addr;
 660	size_t size;
 661
 662	if (proc->vma == NULL) {
 663		pr_err("%d: binder_alloc_buf, no vma\n",
 664		       proc->pid);
 665		return NULL;
 666	}
 667
 668	size = ALIGN(data_size, sizeof(void *)) +
 669		ALIGN(offsets_size, sizeof(void *));
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 670
 671	if (size < data_size || size < offsets_size) {
 672		binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
 673				proc->pid, data_size, offsets_size);
 674		return NULL;
 675	}
 676
 677	if (is_async &&
 678	    proc->free_async_space < size + sizeof(struct binder_buffer)) {
 679		binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 680			     "%d: binder_alloc_buf size %zd failed, no async space left\n",
 681			      proc->pid, size);
 682		return NULL;
 683	}
 
 
 
 
 
 
 
 
 684
 685	while (n) {
 686		buffer = rb_entry(n, struct binder_buffer, rb_node);
 687		BUG_ON(!buffer->free);
 688		buffer_size = binder_buffer_size(proc, buffer);
 689
 690		if (size < buffer_size) {
 691			best_fit = n;
 692			n = n->rb_left;
 693		} else if (size > buffer_size)
 694			n = n->rb_right;
 695		else {
 696			best_fit = n;
 697			break;
 698		}
 699	}
 700	if (best_fit == NULL) {
 701		pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
 702			proc->pid, size);
 703		return NULL;
 704	}
 705	if (n == NULL) {
 706		buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 707		buffer_size = binder_buffer_size(proc, buffer);
 708	}
 709
 710	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 711		     "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
 712		      proc->pid, size, buffer, buffer_size);
 713
 714	has_page_addr =
 715		(void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 716	if (n == NULL) {
 717		if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 718			buffer_size = size; /* no room for other buffers */
 719		else
 720			buffer_size = size + sizeof(struct binder_buffer);
 721	}
 722	end_page_addr =
 723		(void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 724	if (end_page_addr > has_page_addr)
 725		end_page_addr = has_page_addr;
 726	if (binder_update_page_range(proc, 1,
 727	    (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 728		return NULL;
 729
 730	rb_erase(best_fit, &proc->free_buffers);
 731	buffer->free = 0;
 732	binder_insert_allocated_buffer(proc, buffer);
 733	if (buffer_size != size) {
 734		struct binder_buffer *new_buffer = (void *)buffer->data + size;
 735
 736		list_add(&new_buffer->entry, &buffer->entry);
 737		new_buffer->free = 1;
 738		binder_insert_free_buffer(proc, new_buffer);
 739	}
 740	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 741		     "%d: binder_alloc_buf size %zd got %p\n",
 742		      proc->pid, size, buffer);
 743	buffer->data_size = data_size;
 744	buffer->offsets_size = offsets_size;
 745	buffer->async_transaction = is_async;
 746	if (is_async) {
 747		proc->free_async_space -= size + sizeof(struct binder_buffer);
 748		binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 749			     "%d: binder_alloc_buf size %zd async free %zd\n",
 750			      proc->pid, size, proc->free_async_space);
 751	}
 752
 753	return buffer;
 
 
 
 
 
 
 754}
 755
 756static void *buffer_start_page(struct binder_buffer *buffer)
 757{
 758	return (void *)((uintptr_t)buffer & PAGE_MASK);
 
 
 
 
 
 
 759}
 760
 761static void *buffer_end_page(struct binder_buffer *buffer)
 762{
 763	return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 
 
 
 764}
 765
 766static void binder_delete_free_buffer(struct binder_proc *proc,
 767				      struct binder_buffer *buffer)
 768{
 769	struct binder_buffer *prev, *next = NULL;
 770	int free_page_end = 1;
 771	int free_page_start = 1;
 772
 773	BUG_ON(proc->buffers.next == &buffer->entry);
 774	prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 775	BUG_ON(!prev->free);
 776	if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 777		free_page_start = 0;
 778		if (buffer_end_page(prev) == buffer_end_page(buffer))
 779			free_page_end = 0;
 780		binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 781			     "%d: merge free, buffer %p share page with %p\n",
 782			      proc->pid, buffer, prev);
 783	}
 784
 785	if (!list_is_last(&buffer->entry, &proc->buffers)) {
 786		next = list_entry(buffer->entry.next,
 787				  struct binder_buffer, entry);
 788		if (buffer_start_page(next) == buffer_end_page(buffer)) {
 789			free_page_end = 0;
 790			if (buffer_start_page(next) ==
 791			    buffer_start_page(buffer))
 792				free_page_start = 0;
 793			binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 794				     "%d: merge free, buffer %p share page with %p\n",
 795				      proc->pid, buffer, prev);
 796		}
 797	}
 798	list_del(&buffer->entry);
 799	if (free_page_start || free_page_end) {
 800		binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 801			     "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
 802			     proc->pid, buffer, free_page_start ? "" : " end",
 803			     free_page_end ? "" : " start", prev, next);
 804		binder_update_page_range(proc, 0, free_page_start ?
 805			buffer_start_page(buffer) : buffer_end_page(buffer),
 806			(free_page_end ? buffer_end_page(buffer) :
 807			buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 808	}
 809}
 810
 811static void binder_free_buf(struct binder_proc *proc,
 812			    struct binder_buffer *buffer)
 
 
 
 
 
 
 
 
 
 
 
 
 813{
 814	size_t size, buffer_size;
 815
 816	buffer_size = binder_buffer_size(proc, buffer);
 
 
 
 817
 818	size = ALIGN(buffer->data_size, sizeof(void *)) +
 819		ALIGN(buffer->offsets_size, sizeof(void *));
 820
 821	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 822		     "%d: binder_free_buf %p size %zd buffer_size %zd\n",
 823		      proc->pid, buffer, size, buffer_size);
 824
 825	BUG_ON(buffer->free);
 826	BUG_ON(size > buffer_size);
 827	BUG_ON(buffer->transaction != NULL);
 828	BUG_ON((void *)buffer < proc->buffer);
 829	BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 830
 831	if (buffer->async_transaction) {
 832		proc->free_async_space += size + sizeof(struct binder_buffer);
 
 
 
 
 
 
 
 
 
 
 
 
 
 833
 834		binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 835			     "%d: binder_free_buf size %zd async free %zd\n",
 836			      proc->pid, size, proc->free_async_space);
 837	}
 838
 839	binder_update_page_range(proc, 0,
 840		(void *)PAGE_ALIGN((uintptr_t)buffer->data),
 841		(void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 842		NULL);
 843	rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 844	buffer->free = 1;
 845	if (!list_is_last(&buffer->entry, &proc->buffers)) {
 846		struct binder_buffer *next = list_entry(buffer->entry.next,
 847						struct binder_buffer, entry);
 848
 849		if (next->free) {
 850			rb_erase(&next->rb_node, &proc->free_buffers);
 851			binder_delete_free_buffer(proc, next);
 852		}
 853	}
 854	if (proc->buffers.next != &buffer->entry) {
 855		struct binder_buffer *prev = list_entry(buffer->entry.prev,
 856						struct binder_buffer, entry);
 857
 858		if (prev->free) {
 859			binder_delete_free_buffer(proc, buffer);
 860			rb_erase(&prev->rb_node, &proc->free_buffers);
 861			buffer = prev;
 862		}
 863	}
 864	binder_insert_free_buffer(proc, buffer);
 
 
 
 
 
 
 
 865}
 866
 867static struct binder_node *binder_get_node(struct binder_proc *proc,
 868					   binder_uintptr_t ptr)
 869{
 870	struct rb_node *n = proc->nodes.rb_node;
 871	struct binder_node *node;
 872
 
 
 873	while (n) {
 874		node = rb_entry(n, struct binder_node, rb_node);
 875
 876		if (ptr < node->ptr)
 877			n = n->rb_left;
 878		else if (ptr > node->ptr)
 879			n = n->rb_right;
 880		else
 
 
 
 
 
 
 881			return node;
 
 882	}
 883	return NULL;
 884}
 885
 886static struct binder_node *binder_new_node(struct binder_proc *proc,
 887					   binder_uintptr_t ptr,
 888					   binder_uintptr_t cookie)
 
 
 
 
 
 
 
 
 
 
 
 
 889{
 890	struct rb_node **p = &proc->nodes.rb_node;
 891	struct rb_node *parent = NULL;
 892	struct binder_node *node;
 
 
 
 
 
 893
 894	while (*p) {
 
 895		parent = *p;
 896		node = rb_entry(parent, struct binder_node, rb_node);
 897
 898		if (ptr < node->ptr)
 899			p = &(*p)->rb_left;
 900		else if (ptr > node->ptr)
 901			p = &(*p)->rb_right;
 902		else
 903			return NULL;
 
 
 
 
 
 
 
 904	}
 905
 906	node = kzalloc(sizeof(*node), GFP_KERNEL);
 907	if (node == NULL)
 908		return NULL;
 909	binder_stats_created(BINDER_STAT_NODE);
 
 910	rb_link_node(&node->rb_node, parent, p);
 911	rb_insert_color(&node->rb_node, &proc->nodes);
 912	node->debug_id = ++binder_last_id;
 913	node->proc = proc;
 914	node->ptr = ptr;
 915	node->cookie = cookie;
 916	node->work.type = BINDER_WORK_NODE;
 
 
 
 
 917	INIT_LIST_HEAD(&node->work.entry);
 918	INIT_LIST_HEAD(&node->async_todo);
 919	binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 920		     "%d:%d node %d u%016llx c%016llx created\n",
 921		     proc->pid, current->pid, node->debug_id,
 922		     (u64)node->ptr, (u64)node->cookie);
 
 923	return node;
 924}
 925
 926static int binder_inc_node(struct binder_node *node, int strong, int internal,
 927			   struct list_head *target_list)
 928{
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 929	if (strong) {
 930		if (internal) {
 931			if (target_list == NULL &&
 932			    node->internal_strong_refs == 0 &&
 933			    !(node == binder_context_mgr_node &&
 934			    node->has_strong_ref)) {
 
 935				pr_err("invalid inc strong node for %d\n",
 936					node->debug_id);
 937				return -EINVAL;
 938			}
 939			node->internal_strong_refs++;
 940		} else
 941			node->local_strong_refs++;
 942		if (!node->has_strong_ref && target_list) {
 943			list_del_init(&node->work.entry);
 944			list_add_tail(&node->work.entry, target_list);
 
 
 
 
 945		}
 946	} else {
 947		if (!internal)
 948			node->local_weak_refs++;
 949		if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 950			if (target_list == NULL) {
 951				pr_err("invalid inc weak node for %d\n",
 952					node->debug_id);
 953				return -EINVAL;
 954			}
 955			list_add_tail(&node->work.entry, target_list);
 
 
 
 956		}
 957	}
 958	return 0;
 959}
 960
 961static int binder_dec_node(struct binder_node *node, int strong, int internal)
 
 
 
 
 
 
 
 
 
 
 
 
 
 962{
 
 
 
 
 
 963	if (strong) {
 964		if (internal)
 965			node->internal_strong_refs--;
 966		else
 967			node->local_strong_refs--;
 968		if (node->local_strong_refs || node->internal_strong_refs)
 969			return 0;
 970	} else {
 971		if (!internal)
 972			node->local_weak_refs--;
 973		if (node->local_weak_refs || !hlist_empty(&node->refs))
 974			return 0;
 
 975	}
 976	if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
 
 977		if (list_empty(&node->work.entry)) {
 978			list_add_tail(&node->work.entry, &node->proc->todo);
 979			wake_up_interruptible(&node->proc->wait);
 980		}
 981	} else {
 982		if (hlist_empty(&node->refs) && !node->local_strong_refs &&
 983		    !node->local_weak_refs) {
 984			list_del_init(&node->work.entry);
 985			if (node->proc) {
 986				rb_erase(&node->rb_node, &node->proc->nodes);
 987				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 988					     "refless node %d deleted\n",
 989					     node->debug_id);
 990			} else {
 
 
 
 
 
 
 
 
 
 
 991				hlist_del(&node->dead_node);
 
 992				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 993					     "dead node %d deleted\n",
 994					     node->debug_id);
 995			}
 996			kfree(node);
 997			binder_stats_deleted(BINDER_STAT_NODE);
 998		}
 999	}
 
 
1000
1001	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1002}
1003
 
 
 
 
1004
1005static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1006					 uint32_t desc)
1007{
1008	struct rb_node *n = proc->refs_by_desc.rb_node;
1009	struct binder_ref *ref;
1010
1011	while (n) {
1012		ref = rb_entry(n, struct binder_ref, rb_node_desc);
1013
1014		if (desc < ref->desc)
1015			n = n->rb_left;
1016		else if (desc > ref->desc)
1017			n = n->rb_right;
1018		else
 
 
 
1019			return ref;
 
1020	}
1021	return NULL;
1022}
1023
1024static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1025						  struct binder_node *node)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1026{
1027	struct rb_node *n;
1028	struct rb_node **p = &proc->refs_by_node.rb_node;
1029	struct rb_node *parent = NULL;
1030	struct binder_ref *ref, *new_ref;
 
1031
1032	while (*p) {
1033		parent = *p;
1034		ref = rb_entry(parent, struct binder_ref, rb_node_node);
1035
1036		if (node < ref->node)
1037			p = &(*p)->rb_left;
1038		else if (node > ref->node)
1039			p = &(*p)->rb_right;
1040		else
1041			return ref;
1042	}
1043	new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1044	if (new_ref == NULL)
1045		return NULL;
 
1046	binder_stats_created(BINDER_STAT_REF);
1047	new_ref->debug_id = ++binder_last_id;
1048	new_ref->proc = proc;
1049	new_ref->node = node;
1050	rb_link_node(&new_ref->rb_node_node, parent, p);
1051	rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1052
1053	new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1054	for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1055		ref = rb_entry(n, struct binder_ref, rb_node_desc);
1056		if (ref->desc > new_ref->desc)
1057			break;
1058		new_ref->desc = ref->desc + 1;
1059	}
1060
1061	p = &proc->refs_by_desc.rb_node;
1062	while (*p) {
1063		parent = *p;
1064		ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1065
1066		if (new_ref->desc < ref->desc)
1067			p = &(*p)->rb_left;
1068		else if (new_ref->desc > ref->desc)
1069			p = &(*p)->rb_right;
1070		else
1071			BUG();
1072	}
1073	rb_link_node(&new_ref->rb_node_desc, parent, p);
1074	rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1075	if (node) {
1076		hlist_add_head(&new_ref->node_entry, &node->refs);
1077
1078		binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1079			     "%d new ref %d desc %d for node %d\n",
1080			      proc->pid, new_ref->debug_id, new_ref->desc,
1081			      node->debug_id);
1082	} else {
1083		binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1084			     "%d new ref %d desc %d for dead node\n",
1085			      proc->pid, new_ref->debug_id, new_ref->desc);
1086	}
1087	return new_ref;
1088}
1089
1090static void binder_delete_ref(struct binder_ref *ref)
1091{
 
 
1092	binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1093		     "%d delete ref %d desc %d for node %d\n",
1094		      ref->proc->pid, ref->debug_id, ref->desc,
1095		      ref->node->debug_id);
1096
1097	rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1098	rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1099	if (ref->strong)
1100		binder_dec_node(ref->node, 1, 1);
 
 
 
1101	hlist_del(&ref->node_entry);
1102	binder_dec_node(ref->node, 0, 1);
 
 
 
 
 
 
 
 
 
 
 
 
 
1103	if (ref->death) {
1104		binder_debug(BINDER_DEBUG_DEAD_BINDER,
1105			     "%d delete ref %d desc %d has death notification\n",
1106			      ref->proc->pid, ref->debug_id, ref->desc);
1107		list_del(&ref->death->work.entry);
1108		kfree(ref->death);
1109		binder_stats_deleted(BINDER_STAT_DEATH);
1110	}
1111	kfree(ref);
1112	binder_stats_deleted(BINDER_STAT_REF);
1113}
1114
1115static int binder_inc_ref(struct binder_ref *ref, int strong,
1116			  struct list_head *target_list)
 
 
 
 
 
 
 
 
 
 
1117{
1118	int ret;
1119
1120	if (strong) {
1121		if (ref->strong == 0) {
1122			ret = binder_inc_node(ref->node, 1, 1, target_list);
1123			if (ret)
1124				return ret;
1125		}
1126		ref->strong++;
1127	} else {
1128		if (ref->weak == 0) {
1129			ret = binder_inc_node(ref->node, 0, 1, target_list);
1130			if (ret)
1131				return ret;
1132		}
1133		ref->weak++;
1134	}
1135	return 0;
1136}
1137
1138
1139static int binder_dec_ref(struct binder_ref *ref, int strong)
 
 
 
 
 
 
 
 
1140{
1141	if (strong) {
1142		if (ref->strong == 0) {
1143			binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1144					  ref->proc->pid, ref->debug_id,
1145					  ref->desc, ref->strong, ref->weak);
1146			return -EINVAL;
1147		}
1148		ref->strong--;
1149		if (ref->strong == 0) {
1150			int ret;
1151
1152			ret = binder_dec_node(ref->node, strong, 1);
1153			if (ret)
1154				return ret;
1155		}
1156	} else {
1157		if (ref->weak == 0) {
1158			binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1159					  ref->proc->pid, ref->debug_id,
1160					  ref->desc, ref->strong, ref->weak);
1161			return -EINVAL;
1162		}
1163		ref->weak--;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1164	}
1165	if (ref->strong == 0 && ref->weak == 0)
1166		binder_delete_ref(ref);
1167	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
1168}
1169
1170static void binder_pop_transaction(struct binder_thread *target_thread,
1171				   struct binder_transaction *t)
 
 
 
 
 
 
 
 
 
 
 
1172{
1173	if (target_thread) {
1174		BUG_ON(target_thread->transaction_stack != t);
1175		BUG_ON(target_thread->transaction_stack->from != target_thread);
1176		target_thread->transaction_stack =
1177			target_thread->transaction_stack->from_parent;
1178		t->from = NULL;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1179	}
1180	t->need_reply = 0;
1181	if (t->buffer)
1182		t->buffer->transaction = NULL;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1183	kfree(t);
1184	binder_stats_deleted(BINDER_STAT_TRANSACTION);
1185}
1186
1187static void binder_send_failed_reply(struct binder_transaction *t,
1188				     uint32_t error_code)
1189{
1190	struct binder_thread *target_thread;
1191	struct binder_transaction *next;
1192
1193	BUG_ON(t->flags & TF_ONE_WAY);
1194	while (1) {
1195		target_thread = t->from;
1196		if (target_thread) {
1197			if (target_thread->return_error != BR_OK &&
1198			   target_thread->return_error2 == BR_OK) {
1199				target_thread->return_error2 =
1200					target_thread->return_error;
1201				target_thread->return_error = BR_OK;
1202			}
1203			if (target_thread->return_error == BR_OK) {
1204				binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1205					     "send failed reply for transaction %d to %d:%d\n",
1206					      t->debug_id,
1207					      target_thread->proc->pid,
1208					      target_thread->pid);
1209
1210				binder_pop_transaction(target_thread, t);
1211				target_thread->return_error = error_code;
1212				wake_up_interruptible(&target_thread->wait);
1213			} else {
1214				pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1215					target_thread->proc->pid,
1216					target_thread->pid,
1217					target_thread->return_error);
1218			}
 
 
 
 
 
 
 
1219			return;
 
 
1220		}
1221		next = t->from_parent;
1222
1223		binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1224			     "send failed reply for transaction %d, target dead\n",
1225			     t->debug_id);
1226
1227		binder_pop_transaction(target_thread, t);
1228		if (next == NULL) {
1229			binder_debug(BINDER_DEBUG_DEAD_BINDER,
1230				     "reply failed, no target thread at root\n");
1231			return;
1232		}
1233		t = next;
1234		binder_debug(BINDER_DEBUG_DEAD_BINDER,
1235			     "reply failed, no target thread -- retry %d\n",
1236			      t->debug_id);
1237	}
1238}
1239
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1240static void binder_transaction_buffer_release(struct binder_proc *proc,
1241					      struct binder_buffer *buffer,
1242					      binder_size_t *failed_at)
 
1243{
1244	binder_size_t *offp, *off_end;
1245	int debug_id = buffer->debug_id;
 
1246
1247	binder_debug(BINDER_DEBUG_TRANSACTION,
1248		     "%d buffer release %d, size %zd-%zd, failed at %p\n",
1249		     proc->pid, buffer->debug_id,
1250		     buffer->data_size, buffer->offsets_size, failed_at);
 
1251
1252	if (buffer->target_node)
1253		binder_dec_node(buffer->target_node, 1, 0);
1254
1255	offp = (binder_size_t *)(buffer->data +
1256				 ALIGN(buffer->data_size, sizeof(void *)));
1257	if (failed_at)
1258		off_end = failed_at;
1259	else
1260		off_end = (void *)offp + buffer->offsets_size;
1261	for (; offp < off_end; offp++) {
1262		struct flat_binder_object *fp;
1263
1264		if (*offp > buffer->data_size - sizeof(*fp) ||
1265		    buffer->data_size < sizeof(*fp) ||
1266		    !IS_ALIGNED(*offp, sizeof(u32))) {
1267			pr_err("transaction release %d bad offset %lld, size %zd\n",
1268			       debug_id, (u64)*offp, buffer->data_size);
 
 
 
 
1269			continue;
1270		}
1271		fp = (struct flat_binder_object *)(buffer->data + *offp);
1272		switch (fp->type) {
1273		case BINDER_TYPE_BINDER:
1274		case BINDER_TYPE_WEAK_BINDER: {
1275			struct binder_node *node = binder_get_node(proc, fp->binder);
 
1276
 
 
1277			if (node == NULL) {
1278				pr_err("transaction release %d bad node %016llx\n",
1279				       debug_id, (u64)fp->binder);
1280				break;
1281			}
1282			binder_debug(BINDER_DEBUG_TRANSACTION,
1283				     "        node %d u%016llx\n",
1284				     node->debug_id, (u64)node->ptr);
1285			binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
 
 
1286		} break;
1287		case BINDER_TYPE_HANDLE:
1288		case BINDER_TYPE_WEAK_HANDLE: {
1289			struct binder_ref *ref = binder_get_ref(proc, fp->handle);
 
 
1290
1291			if (ref == NULL) {
1292				pr_err("transaction release %d bad handle %d\n",
1293				 debug_id, fp->handle);
 
 
 
 
1294				break;
1295			}
1296			binder_debug(BINDER_DEBUG_TRANSACTION,
1297				     "        ref %d desc %d (node %d)\n",
1298				     ref->debug_id, ref->desc, ref->node->debug_id);
1299			binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1300		} break;
1301
1302		case BINDER_TYPE_FD:
1303			binder_debug(BINDER_DEBUG_TRANSACTION,
1304				     "        fd %d\n", fp->handle);
1305			if (failed_at)
1306				task_close_fd(proc, fp->handle);
 
 
 
 
 
 
 
 
 
 
 
 
 
1307			break;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1308
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1309		default:
1310			pr_err("transaction release %d bad object type %x\n",
1311				debug_id, fp->type);
1312			break;
1313		}
1314	}
1315}
1316
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1317static void binder_transaction(struct binder_proc *proc,
1318			       struct binder_thread *thread,
1319			       struct binder_transaction_data *tr, int reply)
 
1320{
 
1321	struct binder_transaction *t;
 
1322	struct binder_work *tcomplete;
1323	binder_size_t *offp, *off_end;
 
1324	binder_size_t off_min;
1325	struct binder_proc *target_proc;
 
1326	struct binder_thread *target_thread = NULL;
1327	struct binder_node *target_node = NULL;
1328	struct list_head *target_list;
1329	wait_queue_head_t *target_wait;
1330	struct binder_transaction *in_reply_to = NULL;
1331	struct binder_transaction_log_entry *e;
1332	uint32_t return_error;
 
 
 
 
 
 
 
 
1333
1334	e = binder_transaction_log_add(&binder_transaction_log);
 
1335	e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1336	e->from_proc = proc->pid;
1337	e->from_thread = thread->pid;
1338	e->target_handle = tr->target.handle;
1339	e->data_size = tr->data_size;
1340	e->offsets_size = tr->offsets_size;
 
1341
1342	if (reply) {
 
1343		in_reply_to = thread->transaction_stack;
1344		if (in_reply_to == NULL) {
 
1345			binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1346					  proc->pid, thread->pid);
1347			return_error = BR_FAILED_REPLY;
 
 
1348			goto err_empty_call_stack;
1349		}
1350		binder_set_nice(in_reply_to->saved_priority);
1351		if (in_reply_to->to_thread != thread) {
 
1352			binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1353				proc->pid, thread->pid, in_reply_to->debug_id,
1354				in_reply_to->to_proc ?
1355				in_reply_to->to_proc->pid : 0,
1356				in_reply_to->to_thread ?
1357				in_reply_to->to_thread->pid : 0);
 
 
1358			return_error = BR_FAILED_REPLY;
 
 
1359			in_reply_to = NULL;
1360			goto err_bad_call_stack;
1361		}
1362		thread->transaction_stack = in_reply_to->to_parent;
1363		target_thread = in_reply_to->from;
 
 
1364		if (target_thread == NULL) {
 
 
1365			return_error = BR_DEAD_REPLY;
 
1366			goto err_dead_binder;
1367		}
1368		if (target_thread->transaction_stack != in_reply_to) {
1369			binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1370				proc->pid, thread->pid,
1371				target_thread->transaction_stack ?
1372				target_thread->transaction_stack->debug_id : 0,
1373				in_reply_to->debug_id);
 
1374			return_error = BR_FAILED_REPLY;
 
 
1375			in_reply_to = NULL;
1376			target_thread = NULL;
1377			goto err_dead_binder;
1378		}
1379		target_proc = target_thread->proc;
 
 
1380	} else {
1381		if (tr->target.handle) {
1382			struct binder_ref *ref;
1383
1384			ref = binder_get_ref(proc, tr->target.handle);
1385			if (ref == NULL) {
 
 
 
 
 
 
 
 
 
 
 
 
 
1386				binder_user_error("%d:%d got transaction to invalid handle\n",
1387					proc->pid, thread->pid);
1388				return_error = BR_FAILED_REPLY;
1389				goto err_invalid_target_handle;
1390			}
1391			target_node = ref->node;
1392		} else {
1393			target_node = binder_context_mgr_node;
1394			if (target_node == NULL) {
 
 
 
 
 
1395				return_error = BR_DEAD_REPLY;
1396				goto err_no_context_mgr_node;
 
 
 
 
 
 
 
1397			}
1398		}
1399		e->to_node = target_node->debug_id;
1400		target_proc = target_node->proc;
1401		if (target_proc == NULL) {
1402			return_error = BR_DEAD_REPLY;
 
 
1403			goto err_dead_binder;
1404		}
 
1405		if (security_binder_transaction(proc->tsk,
1406						target_proc->tsk) < 0) {
1407			return_error = BR_FAILED_REPLY;
 
 
1408			goto err_invalid_target_handle;
1409		}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1410		if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1411			struct binder_transaction *tmp;
1412
1413			tmp = thread->transaction_stack;
1414			if (tmp->to_thread != thread) {
 
1415				binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1416					proc->pid, thread->pid, tmp->debug_id,
1417					tmp->to_proc ? tmp->to_proc->pid : 0,
1418					tmp->to_thread ?
1419					tmp->to_thread->pid : 0);
 
 
1420				return_error = BR_FAILED_REPLY;
 
 
1421				goto err_bad_call_stack;
1422			}
1423			while (tmp) {
1424				if (tmp->from && tmp->from->proc == target_proc)
1425					target_thread = tmp->from;
 
 
 
 
 
 
 
 
 
1426				tmp = tmp->from_parent;
1427			}
1428		}
 
1429	}
1430	if (target_thread) {
1431		e->to_thread = target_thread->pid;
1432		target_list = &target_thread->todo;
1433		target_wait = &target_thread->wait;
1434	} else {
1435		target_list = &target_proc->todo;
1436		target_wait = &target_proc->wait;
1437	}
1438	e->to_proc = target_proc->pid;
1439
1440	/* TODO: reuse incoming transaction for reply */
1441	t = kzalloc(sizeof(*t), GFP_KERNEL);
1442	if (t == NULL) {
1443		return_error = BR_FAILED_REPLY;
 
 
1444		goto err_alloc_t_failed;
1445	}
 
1446	binder_stats_created(BINDER_STAT_TRANSACTION);
 
1447
1448	tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1449	if (tcomplete == NULL) {
1450		return_error = BR_FAILED_REPLY;
 
 
1451		goto err_alloc_tcomplete_failed;
1452	}
1453	binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1454
1455	t->debug_id = ++binder_last_id;
1456	e->debug_id = t->debug_id;
1457
1458	if (reply)
1459		binder_debug(BINDER_DEBUG_TRANSACTION,
1460			     "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld\n",
1461			     proc->pid, thread->pid, t->debug_id,
1462			     target_proc->pid, target_thread->pid,
1463			     (u64)tr->data.ptr.buffer,
1464			     (u64)tr->data.ptr.offsets,
1465			     (u64)tr->data_size, (u64)tr->offsets_size);
 
1466	else
1467		binder_debug(BINDER_DEBUG_TRANSACTION,
1468			     "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld\n",
1469			     proc->pid, thread->pid, t->debug_id,
1470			     target_proc->pid, target_node->debug_id,
1471			     (u64)tr->data.ptr.buffer,
1472			     (u64)tr->data.ptr.offsets,
1473			     (u64)tr->data_size, (u64)tr->offsets_size);
 
1474
1475	if (!reply && !(tr->flags & TF_ONE_WAY))
1476		t->from = thread;
1477	else
1478		t->from = NULL;
1479	t->sender_euid = task_euid(proc->tsk);
1480	t->to_proc = target_proc;
1481	t->to_thread = target_thread;
1482	t->code = tr->code;
1483	t->flags = tr->flags;
1484	t->priority = task_nice(current);
1485
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1486	trace_binder_transaction(reply, t, target_node);
1487
1488	t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1489		tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1490	if (t->buffer == NULL) {
1491		return_error = BR_FAILED_REPLY;
 
 
 
 
 
 
 
 
1492		goto err_binder_alloc_buf_failed;
1493	}
1494	t->buffer->allow_user_free = 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1495	t->buffer->debug_id = t->debug_id;
1496	t->buffer->transaction = t;
1497	t->buffer->target_node = target_node;
1498	trace_binder_transaction_alloc_buf(t->buffer);
1499	if (target_node)
1500		binder_inc_node(target_node, 1, 0, NULL);
1501
1502	offp = (binder_size_t *)(t->buffer->data +
1503				 ALIGN(tr->data_size, sizeof(void *)));
1504
1505	if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
1506			   tr->data.ptr.buffer, tr->data_size)) {
 
1507		binder_user_error("%d:%d got transaction with invalid data ptr\n",
1508				proc->pid, thread->pid);
1509		return_error = BR_FAILED_REPLY;
 
 
1510		goto err_copy_data_failed;
1511	}
1512	if (copy_from_user(offp, (const void __user *)(uintptr_t)
1513			   tr->data.ptr.offsets, tr->offsets_size)) {
 
 
 
 
 
1514		binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1515				proc->pid, thread->pid);
1516		return_error = BR_FAILED_REPLY;
 
 
1517		goto err_copy_data_failed;
1518	}
1519	if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
1520		binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
1521				proc->pid, thread->pid, (u64)tr->offsets_size);
1522		return_error = BR_FAILED_REPLY;
 
 
1523		goto err_bad_offset;
1524	}
1525	off_end = (void *)offp + tr->offsets_size;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1526	off_min = 0;
1527	for (; offp < off_end; offp++) {
1528		struct flat_binder_object *fp;
1529
1530		if (*offp > t->buffer->data_size - sizeof(*fp) ||
1531		    *offp < off_min ||
1532		    t->buffer->data_size < sizeof(*fp) ||
1533		    !IS_ALIGNED(*offp, sizeof(u32))) {
1534			binder_user_error("%d:%d got transaction with invalid offset, %lld (min %lld, max %lld)\n",
1535					  proc->pid, thread->pid, (u64)*offp,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1536					  (u64)off_min,
1537					  (u64)(t->buffer->data_size -
1538					  sizeof(*fp)));
1539			return_error = BR_FAILED_REPLY;
 
 
1540			goto err_bad_offset;
1541		}
1542		fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1543		off_min = *offp + sizeof(struct flat_binder_object);
1544		switch (fp->type) {
 
1545		case BINDER_TYPE_BINDER:
1546		case BINDER_TYPE_WEAK_BINDER: {
1547			struct binder_ref *ref;
1548			struct binder_node *node = binder_get_node(proc, fp->binder);
1549
1550			if (node == NULL) {
1551				node = binder_new_node(proc, fp->binder, fp->cookie);
1552				if (node == NULL) {
1553					return_error = BR_FAILED_REPLY;
1554					goto err_binder_new_node_failed;
1555				}
1556				node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1557				node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1558			}
1559			if (fp->cookie != node->cookie) {
1560				binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1561					proc->pid, thread->pid,
1562					(u64)fp->binder, node->debug_id,
1563					(u64)fp->cookie, (u64)node->cookie);
1564				return_error = BR_FAILED_REPLY;
1565				goto err_binder_get_ref_for_node_failed;
1566			}
1567			if (security_binder_transfer_binder(proc->tsk,
1568							    target_proc->tsk)) {
1569				return_error = BR_FAILED_REPLY;
1570				goto err_binder_get_ref_for_node_failed;
1571			}
1572			ref = binder_get_ref_for_node(target_proc, node);
1573			if (ref == NULL) {
1574				return_error = BR_FAILED_REPLY;
1575				goto err_binder_get_ref_for_node_failed;
 
 
1576			}
1577			if (fp->type == BINDER_TYPE_BINDER)
1578				fp->type = BINDER_TYPE_HANDLE;
1579			else
1580				fp->type = BINDER_TYPE_WEAK_HANDLE;
1581			fp->handle = ref->desc;
1582			binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1583				       &thread->todo);
1584
1585			trace_binder_transaction_node_to_ref(t, node, ref);
1586			binder_debug(BINDER_DEBUG_TRANSACTION,
1587				     "        node %d u%016llx -> ref %d desc %d\n",
1588				     node->debug_id, (u64)node->ptr,
1589				     ref->debug_id, ref->desc);
1590		} break;
1591		case BINDER_TYPE_HANDLE:
1592		case BINDER_TYPE_WEAK_HANDLE: {
1593			struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1594
1595			if (ref == NULL) {
1596				binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1597						proc->pid,
1598						thread->pid, fp->handle);
 
 
 
1599				return_error = BR_FAILED_REPLY;
1600				goto err_binder_get_ref_failed;
1601			}
1602			if (security_binder_transfer_binder(proc->tsk,
1603							    target_proc->tsk)) {
1604				return_error = BR_FAILED_REPLY;
1605				goto err_binder_get_ref_failed;
1606			}
1607			if (ref->node->proc == target_proc) {
1608				if (fp->type == BINDER_TYPE_HANDLE)
1609					fp->type = BINDER_TYPE_BINDER;
1610				else
1611					fp->type = BINDER_TYPE_WEAK_BINDER;
1612				fp->binder = ref->node->ptr;
1613				fp->cookie = ref->node->cookie;
1614				binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1615				trace_binder_transaction_ref_to_node(t, ref);
1616				binder_debug(BINDER_DEBUG_TRANSACTION,
1617					     "        ref %d desc %d -> node %d u%016llx\n",
1618					     ref->debug_id, ref->desc, ref->node->debug_id,
1619					     (u64)ref->node->ptr);
1620			} else {
1621				struct binder_ref *new_ref;
1622
1623				new_ref = binder_get_ref_for_node(target_proc, ref->node);
1624				if (new_ref == NULL) {
1625					return_error = BR_FAILED_REPLY;
1626					goto err_binder_get_ref_for_node_failed;
1627				}
1628				fp->handle = new_ref->desc;
1629				binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1630				trace_binder_transaction_ref_to_ref(t, ref,
1631								    new_ref);
1632				binder_debug(BINDER_DEBUG_TRANSACTION,
1633					     "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1634					     ref->debug_id, ref->desc, new_ref->debug_id,
1635					     new_ref->desc, ref->node->debug_id);
1636			}
1637		} break;
1638
1639		case BINDER_TYPE_FD: {
1640			int target_fd;
1641			struct file *file;
1642
1643			if (reply) {
1644				if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1645					binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1646						proc->pid, thread->pid, fp->handle);
1647					return_error = BR_FAILED_REPLY;
1648					goto err_fd_not_allowed;
1649				}
1650			} else if (!target_node->accept_fds) {
1651				binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1652					proc->pid, thread->pid, fp->handle);
1653				return_error = BR_FAILED_REPLY;
1654				goto err_fd_not_allowed;
 
 
1655			}
1656
1657			file = fget(fp->handle);
1658			if (file == NULL) {
1659				binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1660					proc->pid, thread->pid, fp->handle);
 
 
 
 
 
 
 
 
 
 
 
 
1661				return_error = BR_FAILED_REPLY;
1662				goto err_fget_failed;
1663			}
1664			if (security_binder_transfer_file(proc->tsk,
1665							  target_proc->tsk,
1666							  file) < 0) {
1667				fput(file);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1668				return_error = BR_FAILED_REPLY;
1669				goto err_get_unused_fd_failed;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1670			}
1671			target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1672			if (target_fd < 0) {
1673				fput(file);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1674				return_error = BR_FAILED_REPLY;
1675				goto err_get_unused_fd_failed;
 
 
1676			}
1677			task_fd_install(target_proc, target_fd, file);
1678			trace_binder_transaction_fd(t, fp->handle, target_fd);
1679			binder_debug(BINDER_DEBUG_TRANSACTION,
1680				     "        fd %d -> %d\n", fp->handle, target_fd);
1681			/* TODO: fput? */
1682			fp->handle = target_fd;
1683		} break;
1684
1685		default:
1686			binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1687				proc->pid, thread->pid, fp->type);
1688			return_error = BR_FAILED_REPLY;
 
 
1689			goto err_bad_object_type;
1690		}
1691	}
 
 
 
1692	if (reply) {
 
 
 
 
 
 
1693		BUG_ON(t->buffer->async_transaction != 0);
1694		binder_pop_transaction(target_thread, in_reply_to);
 
 
 
 
1695	} else if (!(t->flags & TF_ONE_WAY)) {
1696		BUG_ON(t->buffer->async_transaction != 0);
 
 
 
 
 
 
 
 
 
1697		t->need_reply = 1;
1698		t->from_parent = thread->transaction_stack;
1699		thread->transaction_stack = t;
 
 
 
 
 
 
 
1700	} else {
1701		BUG_ON(target_node == NULL);
1702		BUG_ON(t->buffer->async_transaction != 1);
1703		if (target_node->has_async_transaction) {
1704			target_list = &target_node->async_todo;
1705			target_wait = NULL;
1706		} else
1707			target_node->has_async_transaction = 1;
1708	}
1709	t->work.type = BINDER_WORK_TRANSACTION;
1710	list_add_tail(&t->work.entry, target_list);
1711	tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1712	list_add_tail(&tcomplete->entry, &thread->todo);
1713	if (target_wait)
1714		wake_up_interruptible(target_wait);
 
 
 
1715	return;
1716
1717err_get_unused_fd_failed:
1718err_fget_failed:
1719err_fd_not_allowed:
1720err_binder_get_ref_for_node_failed:
1721err_binder_get_ref_failed:
1722err_binder_new_node_failed:
1723err_bad_object_type:
1724err_bad_offset:
 
1725err_copy_data_failed:
 
1726	trace_binder_transaction_failed_buffer_release(t->buffer);
1727	binder_transaction_buffer_release(target_proc, t->buffer, offp);
 
 
 
 
1728	t->buffer->transaction = NULL;
1729	binder_free_buf(target_proc, t->buffer);
1730err_binder_alloc_buf_failed:
 
 
 
 
1731	kfree(tcomplete);
1732	binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1733err_alloc_tcomplete_failed:
1734	kfree(t);
1735	binder_stats_deleted(BINDER_STAT_TRANSACTION);
1736err_alloc_t_failed:
 
1737err_bad_call_stack:
1738err_empty_call_stack:
1739err_dead_binder:
1740err_invalid_target_handle:
1741err_no_context_mgr_node:
 
 
 
 
 
 
 
 
1742	binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1743		     "%d:%d transaction failed %d, size %lld-%lld\n",
1744		     proc->pid, thread->pid, return_error,
1745		     (u64)tr->data_size, (u64)tr->offsets_size);
 
1746
1747	{
1748		struct binder_transaction_log_entry *fe;
1749
 
 
 
1750		fe = binder_transaction_log_add(&binder_transaction_log_failed);
1751		*fe = *e;
 
 
 
 
 
 
 
1752	}
1753
1754	BUG_ON(thread->return_error != BR_OK);
1755	if (in_reply_to) {
1756		thread->return_error = BR_TRANSACTION_COMPLETE;
 
1757		binder_send_failed_reply(in_reply_to, return_error);
1758	} else
1759		thread->return_error = return_error;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1760}
1761
1762static int binder_thread_write(struct binder_proc *proc,
1763			struct binder_thread *thread,
1764			binder_uintptr_t binder_buffer, size_t size,
1765			binder_size_t *consumed)
1766{
1767	uint32_t cmd;
 
1768	void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
1769	void __user *ptr = buffer + *consumed;
1770	void __user *end = buffer + size;
1771
1772	while (ptr < end && thread->return_error == BR_OK) {
 
 
1773		if (get_user(cmd, (uint32_t __user *)ptr))
1774			return -EFAULT;
1775		ptr += sizeof(uint32_t);
1776		trace_binder_command(cmd);
1777		if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1778			binder_stats.bc[_IOC_NR(cmd)]++;
1779			proc->stats.bc[_IOC_NR(cmd)]++;
1780			thread->stats.bc[_IOC_NR(cmd)]++;
1781		}
1782		switch (cmd) {
1783		case BC_INCREFS:
1784		case BC_ACQUIRE:
1785		case BC_RELEASE:
1786		case BC_DECREFS: {
1787			uint32_t target;
1788			struct binder_ref *ref;
1789			const char *debug_string;
 
 
 
1790
1791			if (get_user(target, (uint32_t __user *)ptr))
1792				return -EFAULT;
 
1793			ptr += sizeof(uint32_t);
1794			if (target == 0 && binder_context_mgr_node &&
1795			    (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1796				ref = binder_get_ref_for_node(proc,
1797					       binder_context_mgr_node);
1798				if (ref->desc != target) {
1799					binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1800						proc->pid, thread->pid,
1801						ref->desc);
1802				}
1803			} else
1804				ref = binder_get_ref(proc, target);
1805			if (ref == NULL) {
1806				binder_user_error("%d:%d refcount change on invalid ref %d\n",
1807					proc->pid, thread->pid, target);
1808				break;
 
 
 
 
1809			}
1810			switch (cmd) {
1811			case BC_INCREFS:
1812				debug_string = "IncRefs";
1813				binder_inc_ref(ref, 0, NULL);
1814				break;
1815			case BC_ACQUIRE:
1816				debug_string = "Acquire";
1817				binder_inc_ref(ref, 1, NULL);
1818				break;
1819			case BC_RELEASE:
1820				debug_string = "Release";
1821				binder_dec_ref(ref, 1);
1822				break;
1823			case BC_DECREFS:
1824			default:
1825				debug_string = "DecRefs";
1826				binder_dec_ref(ref, 0);
 
 
 
 
 
1827				break;
1828			}
1829			binder_debug(BINDER_DEBUG_USER_REFS,
1830				     "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1831				     proc->pid, thread->pid, debug_string, ref->debug_id,
1832				     ref->desc, ref->strong, ref->weak, ref->node->debug_id);
 
1833			break;
1834		}
1835		case BC_INCREFS_DONE:
1836		case BC_ACQUIRE_DONE: {
1837			binder_uintptr_t node_ptr;
1838			binder_uintptr_t cookie;
1839			struct binder_node *node;
 
1840
1841			if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
1842				return -EFAULT;
1843			ptr += sizeof(binder_uintptr_t);
1844			if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1845				return -EFAULT;
1846			ptr += sizeof(binder_uintptr_t);
1847			node = binder_get_node(proc, node_ptr);
1848			if (node == NULL) {
1849				binder_user_error("%d:%d %s u%016llx no match\n",
1850					proc->pid, thread->pid,
1851					cmd == BC_INCREFS_DONE ?
1852					"BC_INCREFS_DONE" :
1853					"BC_ACQUIRE_DONE",
1854					(u64)node_ptr);
1855				break;
1856			}
1857			if (cookie != node->cookie) {
1858				binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
1859					proc->pid, thread->pid,
1860					cmd == BC_INCREFS_DONE ?
1861					"BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1862					(u64)node_ptr, node->debug_id,
1863					(u64)cookie, (u64)node->cookie);
 
1864				break;
1865			}
 
1866			if (cmd == BC_ACQUIRE_DONE) {
1867				if (node->pending_strong_ref == 0) {
1868					binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1869						proc->pid, thread->pid,
1870						node->debug_id);
 
 
1871					break;
1872				}
1873				node->pending_strong_ref = 0;
1874			} else {
1875				if (node->pending_weak_ref == 0) {
1876					binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1877						proc->pid, thread->pid,
1878						node->debug_id);
 
 
1879					break;
1880				}
1881				node->pending_weak_ref = 0;
1882			}
1883			binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
 
 
1884			binder_debug(BINDER_DEBUG_USER_REFS,
1885				     "%d:%d %s node %d ls %d lw %d\n",
1886				     proc->pid, thread->pid,
1887				     cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1888				     node->debug_id, node->local_strong_refs, node->local_weak_refs);
 
 
 
1889			break;
1890		}
1891		case BC_ATTEMPT_ACQUIRE:
1892			pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1893			return -EINVAL;
1894		case BC_ACQUIRE_RESULT:
1895			pr_err("BC_ACQUIRE_RESULT not supported\n");
1896			return -EINVAL;
1897
1898		case BC_FREE_BUFFER: {
1899			binder_uintptr_t data_ptr;
1900			struct binder_buffer *buffer;
1901
1902			if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
1903				return -EFAULT;
1904			ptr += sizeof(binder_uintptr_t);
1905
1906			buffer = binder_buffer_lookup(proc, data_ptr);
1907			if (buffer == NULL) {
1908				binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
1909					proc->pid, thread->pid, (u64)data_ptr);
1910				break;
1911			}
1912			if (!buffer->allow_user_free) {
1913				binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
1914					proc->pid, thread->pid, (u64)data_ptr);
 
 
 
 
 
1915				break;
1916			}
1917			binder_debug(BINDER_DEBUG_FREE_BUFFER,
1918				     "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
1919				     proc->pid, thread->pid, (u64)data_ptr,
1920				     buffer->debug_id,
1921				     buffer->transaction ? "active" : "finished");
1922
1923			if (buffer->transaction) {
1924				buffer->transaction->buffer = NULL;
1925				buffer->transaction = NULL;
1926			}
1927			if (buffer->async_transaction && buffer->target_node) {
1928				BUG_ON(!buffer->target_node->has_async_transaction);
1929				if (list_empty(&buffer->target_node->async_todo))
1930					buffer->target_node->has_async_transaction = 0;
1931				else
1932					list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1933			}
1934			trace_binder_transaction_buffer_release(buffer);
1935			binder_transaction_buffer_release(proc, buffer, NULL);
1936			binder_free_buf(proc, buffer);
1937			break;
1938		}
1939
 
 
 
 
 
 
 
 
 
 
 
1940		case BC_TRANSACTION:
1941		case BC_REPLY: {
1942			struct binder_transaction_data tr;
1943
1944			if (copy_from_user(&tr, ptr, sizeof(tr)))
1945				return -EFAULT;
1946			ptr += sizeof(tr);
1947			binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
 
1948			break;
1949		}
1950
1951		case BC_REGISTER_LOOPER:
1952			binder_debug(BINDER_DEBUG_THREADS,
1953				     "%d:%d BC_REGISTER_LOOPER\n",
1954				     proc->pid, thread->pid);
 
1955			if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1956				thread->looper |= BINDER_LOOPER_STATE_INVALID;
1957				binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1958					proc->pid, thread->pid);
1959			} else if (proc->requested_threads == 0) {
1960				thread->looper |= BINDER_LOOPER_STATE_INVALID;
1961				binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1962					proc->pid, thread->pid);
1963			} else {
1964				proc->requested_threads--;
1965				proc->requested_threads_started++;
1966			}
1967			thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
 
1968			break;
1969		case BC_ENTER_LOOPER:
1970			binder_debug(BINDER_DEBUG_THREADS,
1971				     "%d:%d BC_ENTER_LOOPER\n",
1972				     proc->pid, thread->pid);
1973			if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1974				thread->looper |= BINDER_LOOPER_STATE_INVALID;
1975				binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1976					proc->pid, thread->pid);
1977			}
1978			thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1979			break;
1980		case BC_EXIT_LOOPER:
1981			binder_debug(BINDER_DEBUG_THREADS,
1982				     "%d:%d BC_EXIT_LOOPER\n",
1983				     proc->pid, thread->pid);
1984			thread->looper |= BINDER_LOOPER_STATE_EXITED;
1985			break;
1986
1987		case BC_REQUEST_DEATH_NOTIFICATION:
1988		case BC_CLEAR_DEATH_NOTIFICATION: {
1989			uint32_t target;
1990			binder_uintptr_t cookie;
1991			struct binder_ref *ref;
1992			struct binder_ref_death *death;
1993
1994			if (get_user(target, (uint32_t __user *)ptr))
1995				return -EFAULT;
1996			ptr += sizeof(uint32_t);
1997			if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1998				return -EFAULT;
1999			ptr += sizeof(binder_uintptr_t);
2000			ref = binder_get_ref(proc, target);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2001			if (ref == NULL) {
2002				binder_user_error("%d:%d %s invalid ref %d\n",
2003					proc->pid, thread->pid,
2004					cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2005					"BC_REQUEST_DEATH_NOTIFICATION" :
2006					"BC_CLEAR_DEATH_NOTIFICATION",
2007					target);
 
 
2008				break;
2009			}
2010
2011			binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2012				     "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
2013				     proc->pid, thread->pid,
2014				     cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2015				     "BC_REQUEST_DEATH_NOTIFICATION" :
2016				     "BC_CLEAR_DEATH_NOTIFICATION",
2017				     (u64)cookie, ref->debug_id, ref->desc,
2018				     ref->strong, ref->weak, ref->node->debug_id);
 
2019
 
2020			if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2021				if (ref->death) {
2022					binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2023						proc->pid, thread->pid);
2024					break;
2025				}
2026				death = kzalloc(sizeof(*death), GFP_KERNEL);
2027				if (death == NULL) {
2028					thread->return_error = BR_ERROR;
2029					binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2030						     "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2031						     proc->pid, thread->pid);
2032					break;
2033				}
2034				binder_stats_created(BINDER_STAT_DEATH);
2035				INIT_LIST_HEAD(&death->work.entry);
2036				death->cookie = cookie;
2037				ref->death = death;
2038				if (ref->node->proc == NULL) {
2039					ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2040					if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2041						list_add_tail(&ref->death->work.entry, &thread->todo);
2042					} else {
2043						list_add_tail(&ref->death->work.entry, &proc->todo);
2044						wake_up_interruptible(&proc->wait);
2045					}
2046				}
2047			} else {
2048				if (ref->death == NULL) {
2049					binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2050						proc->pid, thread->pid);
 
 
2051					break;
2052				}
2053				death = ref->death;
2054				if (death->cookie != cookie) {
2055					binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2056						proc->pid, thread->pid,
2057						(u64)death->cookie,
2058						(u64)cookie);
 
 
2059					break;
2060				}
2061				ref->death = NULL;
 
2062				if (list_empty(&death->work.entry)) {
2063					death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2064					if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2065						list_add_tail(&death->work.entry, &thread->todo);
2066					} else {
2067						list_add_tail(&death->work.entry, &proc->todo);
2068						wake_up_interruptible(&proc->wait);
 
 
 
 
 
 
 
2069					}
2070				} else {
2071					BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2072					death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2073				}
 
2074			}
 
 
2075		} break;
2076		case BC_DEAD_BINDER_DONE: {
2077			struct binder_work *w;
2078			binder_uintptr_t cookie;
2079			struct binder_ref_death *death = NULL;
2080
2081			if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2082				return -EFAULT;
2083
2084			ptr += sizeof(cookie);
2085			list_for_each_entry(w, &proc->delivered_death, entry) {
2086				struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
 
 
 
 
 
2087
2088				if (tmp_death->cookie == cookie) {
2089					death = tmp_death;
2090					break;
2091				}
2092			}
2093			binder_debug(BINDER_DEBUG_DEAD_BINDER,
2094				     "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2095				     proc->pid, thread->pid, (u64)cookie,
2096				     death);
2097			if (death == NULL) {
2098				binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2099					proc->pid, thread->pid, (u64)cookie);
 
2100				break;
2101			}
2102
2103			list_del_init(&death->work.entry);
2104			if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2105				death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2106				if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2107					list_add_tail(&death->work.entry, &thread->todo);
2108				} else {
2109					list_add_tail(&death->work.entry, &proc->todo);
2110					wake_up_interruptible(&proc->wait);
 
 
 
 
 
2111				}
2112			}
 
2113		} break;
2114
2115		default:
2116			pr_err("%d:%d unknown command %d\n",
2117			       proc->pid, thread->pid, cmd);
2118			return -EINVAL;
2119		}
2120		*consumed = ptr - buffer;
2121	}
2122	return 0;
2123}
2124
2125static void binder_stat_br(struct binder_proc *proc,
2126			   struct binder_thread *thread, uint32_t cmd)
2127{
2128	trace_binder_return(cmd);
2129	if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2130		binder_stats.br[_IOC_NR(cmd)]++;
2131		proc->stats.br[_IOC_NR(cmd)]++;
2132		thread->stats.br[_IOC_NR(cmd)]++;
2133	}
2134}
2135
2136static int binder_has_proc_work(struct binder_proc *proc,
2137				struct binder_thread *thread)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2138{
2139	return !list_empty(&proc->todo) ||
2140		(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2141}
2142
2143static int binder_has_thread_work(struct binder_thread *thread)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2144{
2145	return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2146		(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2147}
2148
2149static int binder_thread_read(struct binder_proc *proc,
2150			      struct binder_thread *thread,
2151			      binder_uintptr_t binder_buffer, size_t size,
2152			      binder_size_t *consumed, int non_block)
2153{
2154	void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2155	void __user *ptr = buffer + *consumed;
2156	void __user *end = buffer + size;
2157
2158	int ret = 0;
2159	int wait_for_proc_work;
2160
2161	if (*consumed == 0) {
2162		if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2163			return -EFAULT;
2164		ptr += sizeof(uint32_t);
2165	}
2166
2167retry:
2168	wait_for_proc_work = thread->transaction_stack == NULL &&
2169				list_empty(&thread->todo);
2170
2171	if (thread->return_error != BR_OK && ptr < end) {
2172		if (thread->return_error2 != BR_OK) {
2173			if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2174				return -EFAULT;
2175			ptr += sizeof(uint32_t);
2176			binder_stat_br(proc, thread, thread->return_error2);
2177			if (ptr == end)
2178				goto done;
2179			thread->return_error2 = BR_OK;
2180		}
2181		if (put_user(thread->return_error, (uint32_t __user *)ptr))
2182			return -EFAULT;
2183		ptr += sizeof(uint32_t);
2184		binder_stat_br(proc, thread, thread->return_error);
2185		thread->return_error = BR_OK;
2186		goto done;
2187	}
2188
2189
2190	thread->looper |= BINDER_LOOPER_STATE_WAITING;
2191	if (wait_for_proc_work)
2192		proc->ready_threads++;
2193
2194	binder_unlock(__func__);
2195
2196	trace_binder_wait_for_work(wait_for_proc_work,
2197				   !!thread->transaction_stack,
2198				   !list_empty(&thread->todo));
2199	if (wait_for_proc_work) {
2200		if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2201					BINDER_LOOPER_STATE_ENTERED))) {
2202			binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2203				proc->pid, thread->pid, thread->looper);
2204			wait_event_interruptible(binder_user_error_wait,
2205						 binder_stop_on_user_error < 2);
2206		}
2207		binder_set_nice(proc->default_priority);
2208		if (non_block) {
2209			if (!binder_has_proc_work(proc, thread))
2210				ret = -EAGAIN;
2211		} else
2212			ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2213	} else {
2214		if (non_block) {
2215			if (!binder_has_thread_work(thread))
2216				ret = -EAGAIN;
2217		} else
2218			ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2219	}
2220
2221	binder_lock(__func__);
 
 
 
 
 
2222
2223	if (wait_for_proc_work)
2224		proc->ready_threads--;
2225	thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2226
2227	if (ret)
2228		return ret;
2229
2230	while (1) {
2231		uint32_t cmd;
2232		struct binder_transaction_data tr;
2233		struct binder_work *w;
 
 
2234		struct binder_transaction *t = NULL;
 
 
 
 
 
 
 
 
 
 
 
2235
2236		if (!list_empty(&thread->todo)) {
2237			w = list_first_entry(&thread->todo, struct binder_work,
2238					     entry);
2239		} else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2240			w = list_first_entry(&proc->todo, struct binder_work,
2241					     entry);
2242		} else {
2243			/* no data added */
2244			if (ptr - buffer == 4 &&
2245			    !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2246				goto retry;
2247			break;
2248		}
2249
2250		if (end - ptr < sizeof(tr) + 4)
 
2251			break;
 
 
 
 
2252
2253		switch (w->type) {
2254		case BINDER_WORK_TRANSACTION: {
 
2255			t = container_of(w, struct binder_transaction, work);
2256		} break;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2257		case BINDER_WORK_TRANSACTION_COMPLETE: {
 
2258			cmd = BR_TRANSACTION_COMPLETE;
 
 
2259			if (put_user(cmd, (uint32_t __user *)ptr))
2260				return -EFAULT;
2261			ptr += sizeof(uint32_t);
2262
2263			binder_stat_br(proc, thread, cmd);
2264			binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2265				     "%d:%d BR_TRANSACTION_COMPLETE\n",
2266				     proc->pid, thread->pid);
2267
2268			list_del(&w->entry);
2269			kfree(w);
2270			binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2271		} break;
2272		case BINDER_WORK_NODE: {
2273			struct binder_node *node = container_of(w, struct binder_node, work);
2274			uint32_t cmd = BR_NOOP;
2275			const char *cmd_name;
2276			int strong = node->internal_strong_refs || node->local_strong_refs;
2277			int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2278
2279			if (weak && !node->has_weak_ref) {
2280				cmd = BR_INCREFS;
2281				cmd_name = "BR_INCREFS";
 
 
 
 
 
 
 
 
 
 
2282				node->has_weak_ref = 1;
2283				node->pending_weak_ref = 1;
2284				node->local_weak_refs++;
2285			} else if (strong && !node->has_strong_ref) {
2286				cmd = BR_ACQUIRE;
2287				cmd_name = "BR_ACQUIRE";
2288				node->has_strong_ref = 1;
2289				node->pending_strong_ref = 1;
2290				node->local_strong_refs++;
2291			} else if (!strong && node->has_strong_ref) {
2292				cmd = BR_RELEASE;
2293				cmd_name = "BR_RELEASE";
2294				node->has_strong_ref = 0;
2295			} else if (!weak && node->has_weak_ref) {
2296				cmd = BR_DECREFS;
2297				cmd_name = "BR_DECREFS";
2298				node->has_weak_ref = 0;
2299			}
2300			if (cmd != BR_NOOP) {
2301				if (put_user(cmd, (uint32_t __user *)ptr))
2302					return -EFAULT;
2303				ptr += sizeof(uint32_t);
2304				if (put_user(node->ptr,
2305					     (binder_uintptr_t __user *)ptr))
2306					return -EFAULT;
2307				ptr += sizeof(binder_uintptr_t);
2308				if (put_user(node->cookie,
2309					     (binder_uintptr_t __user *)ptr))
2310					return -EFAULT;
2311				ptr += sizeof(binder_uintptr_t);
 
 
 
 
 
 
 
 
 
 
2312
2313				binder_stat_br(proc, thread, cmd);
2314				binder_debug(BINDER_DEBUG_USER_REFS,
2315					     "%d:%d %s %d u%016llx c%016llx\n",
2316					     proc->pid, thread->pid, cmd_name,
2317					     node->debug_id,
2318					     (u64)node->ptr, (u64)node->cookie);
2319			} else {
2320				list_del_init(&w->entry);
2321				if (!weak && !strong) {
2322					binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2323						     "%d:%d node %d u%016llx c%016llx deleted\n",
2324						     proc->pid, thread->pid,
2325						     node->debug_id,
2326						     (u64)node->ptr,
2327						     (u64)node->cookie);
2328					rb_erase(&node->rb_node, &proc->nodes);
2329					kfree(node);
2330					binder_stats_deleted(BINDER_STAT_NODE);
2331				} else {
2332					binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2333						     "%d:%d node %d u%016llx c%016llx state unchanged\n",
2334						     proc->pid, thread->pid,
2335						     node->debug_id,
2336						     (u64)node->ptr,
2337						     (u64)node->cookie);
2338				}
2339			}
 
 
2340		} break;
2341		case BINDER_WORK_DEAD_BINDER:
2342		case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2343		case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2344			struct binder_ref_death *death;
2345			uint32_t cmd;
 
2346
2347			death = container_of(w, struct binder_ref_death, work);
2348			if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2349				cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2350			else
2351				cmd = BR_DEAD_BINDER;
2352			if (put_user(cmd, (uint32_t __user *)ptr))
2353				return -EFAULT;
2354			ptr += sizeof(uint32_t);
2355			if (put_user(death->cookie,
2356				     (binder_uintptr_t __user *)ptr))
2357				return -EFAULT;
2358			ptr += sizeof(binder_uintptr_t);
2359			binder_stat_br(proc, thread, cmd);
2360			binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2361				     "%d:%d %s %016llx\n",
2362				      proc->pid, thread->pid,
2363				      cmd == BR_DEAD_BINDER ?
2364				      "BR_DEAD_BINDER" :
2365				      "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2366				      (u64)death->cookie);
2367
2368			if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2369				list_del(&w->entry);
2370				kfree(death);
2371				binder_stats_deleted(BINDER_STAT_DEATH);
2372			} else
2373				list_move(&w->entry, &proc->delivered_death);
 
 
 
 
 
 
 
 
 
 
 
2374			if (cmd == BR_DEAD_BINDER)
2375				goto done; /* DEAD_BINDER notifications can cause transactions */
2376		} break;
 
 
 
 
 
2377		}
2378
2379		if (!t)
2380			continue;
2381
2382		BUG_ON(t->buffer == NULL);
2383		if (t->buffer->target_node) {
2384			struct binder_node *target_node = t->buffer->target_node;
2385
2386			tr.target.ptr = target_node->ptr;
2387			tr.cookie =  target_node->cookie;
2388			t->saved_priority = task_nice(current);
2389			if (t->priority < target_node->min_priority &&
2390			    !(t->flags & TF_ONE_WAY))
2391				binder_set_nice(t->priority);
2392			else if (!(t->flags & TF_ONE_WAY) ||
2393				 t->saved_priority > target_node->min_priority)
2394				binder_set_nice(target_node->min_priority);
2395			cmd = BR_TRANSACTION;
2396		} else {
2397			tr.target.ptr = 0;
2398			tr.cookie = 0;
2399			cmd = BR_REPLY;
2400		}
2401		tr.code = t->code;
2402		tr.flags = t->flags;
2403		tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2404
2405		if (t->from) {
2406			struct task_struct *sender = t->from->proc->tsk;
2407
2408			tr.sender_pid = task_tgid_nr_ns(sender,
2409							task_active_pid_ns(current));
 
 
2410		} else {
2411			tr.sender_pid = 0;
2412		}
2413
2414		tr.data_size = t->buffer->data_size;
2415		tr.offsets_size = t->buffer->offsets_size;
2416		tr.data.ptr.buffer = (binder_uintptr_t)(
2417					(uintptr_t)t->buffer->data +
2418					proc->user_buffer_offset);
2419		tr.data.ptr.offsets = tr.data.ptr.buffer +
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2420					ALIGN(t->buffer->data_size,
2421					    sizeof(void *));
2422
2423		if (put_user(cmd, (uint32_t __user *)ptr))
 
 
 
 
 
 
 
 
 
 
 
2424			return -EFAULT;
 
2425		ptr += sizeof(uint32_t);
2426		if (copy_to_user(ptr, &tr, sizeof(tr)))
 
 
 
 
 
 
2427			return -EFAULT;
2428		ptr += sizeof(tr);
 
2429
2430		trace_binder_transaction_received(t);
2431		binder_stat_br(proc, thread, cmd);
2432		binder_debug(BINDER_DEBUG_TRANSACTION,
2433			     "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2434			     proc->pid, thread->pid,
2435			     (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2436			     "BR_REPLY",
2437			     t->debug_id, t->from ? t->from->proc->pid : 0,
2438			     t->from ? t->from->pid : 0, cmd,
 
2439			     t->buffer->data_size, t->buffer->offsets_size,
2440			     (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
 
2441
2442		list_del(&t->work.entry);
 
2443		t->buffer->allow_user_free = 1;
2444		if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
 
2445			t->to_parent = thread->transaction_stack;
2446			t->to_thread = thread;
2447			thread->transaction_stack = t;
 
2448		} else {
2449			t->buffer->transaction = NULL;
2450			kfree(t);
2451			binder_stats_deleted(BINDER_STAT_TRANSACTION);
2452		}
2453		break;
2454	}
2455
2456done:
2457
2458	*consumed = ptr - buffer;
2459	if (proc->requested_threads + proc->ready_threads == 0 &&
 
 
2460	    proc->requested_threads_started < proc->max_threads &&
2461	    (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2462	     BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2463	     /*spawn a new thread if we leave this out */) {
2464		proc->requested_threads++;
 
2465		binder_debug(BINDER_DEBUG_THREADS,
2466			     "%d:%d BR_SPAWN_LOOPER\n",
2467			     proc->pid, thread->pid);
2468		if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2469			return -EFAULT;
2470		binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2471	}
 
2472	return 0;
2473}
2474
2475static void binder_release_work(struct list_head *list)
 
2476{
2477	struct binder_work *w;
2478
2479	while (!list_empty(list)) {
2480		w = list_first_entry(list, struct binder_work, entry);
2481		list_del_init(&w->entry);
 
 
2482		switch (w->type) {
2483		case BINDER_WORK_TRANSACTION: {
2484			struct binder_transaction *t;
2485
2486			t = container_of(w, struct binder_transaction, work);
2487			if (t->buffer->target_node &&
2488			    !(t->flags & TF_ONE_WAY)) {
2489				binder_send_failed_reply(t, BR_DEAD_REPLY);
2490			} else {
2491				binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2492					"undelivered transaction %d\n",
2493					t->debug_id);
2494				t->buffer->transaction = NULL;
2495				kfree(t);
2496				binder_stats_deleted(BINDER_STAT_TRANSACTION);
2497			}
2498		} break;
2499		case BINDER_WORK_TRANSACTION_COMPLETE: {
2500			binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2501				"undelivered TRANSACTION_COMPLETE\n");
2502			kfree(w);
2503			binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2504		} break;
2505		case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2506		case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2507			struct binder_ref_death *death;
2508
2509			death = container_of(w, struct binder_ref_death, work);
2510			binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2511				"undelivered death notification, %016llx\n",
2512				(u64)death->cookie);
2513			kfree(death);
2514			binder_stats_deleted(BINDER_STAT_DEATH);
2515		} break;
2516		default:
2517			pr_err("unexpected work type, %d, not freed\n",
2518			       w->type);
2519			break;
2520		}
2521	}
2522
2523}
2524
2525static struct binder_thread *binder_get_thread(struct binder_proc *proc)
 
2526{
2527	struct binder_thread *thread = NULL;
2528	struct rb_node *parent = NULL;
2529	struct rb_node **p = &proc->threads.rb_node;
2530
2531	while (*p) {
2532		parent = *p;
2533		thread = rb_entry(parent, struct binder_thread, rb_node);
2534
2535		if (current->pid < thread->pid)
2536			p = &(*p)->rb_left;
2537		else if (current->pid > thread->pid)
2538			p = &(*p)->rb_right;
2539		else
2540			break;
2541	}
2542	if (*p == NULL) {
2543		thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2544		if (thread == NULL)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2545			return NULL;
2546		binder_stats_created(BINDER_STAT_THREAD);
2547		thread->proc = proc;
2548		thread->pid = current->pid;
2549		init_waitqueue_head(&thread->wait);
2550		INIT_LIST_HEAD(&thread->todo);
2551		rb_link_node(&thread->rb_node, parent, p);
2552		rb_insert_color(&thread->rb_node, &proc->threads);
2553		thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2554		thread->return_error = BR_OK;
2555		thread->return_error2 = BR_OK;
2556	}
2557	return thread;
2558}
2559
2560static int binder_free_thread(struct binder_proc *proc,
2561			      struct binder_thread *thread)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2562{
2563	struct binder_transaction *t;
2564	struct binder_transaction *send_reply = NULL;
2565	int active_transactions = 0;
 
2566
 
 
 
 
 
 
 
 
 
 
 
 
 
2567	rb_erase(&thread->rb_node, &proc->threads);
2568	t = thread->transaction_stack;
2569	if (t && t->to_thread == thread)
2570		send_reply = t;
 
 
 
 
 
 
 
2571	while (t) {
 
2572		active_transactions++;
2573		binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2574			     "release %d:%d transaction %d %s, still active\n",
2575			      proc->pid, thread->pid,
2576			     t->debug_id,
2577			     (t->to_thread == thread) ? "in" : "out");
2578
2579		if (t->to_thread == thread) {
2580			t->to_proc = NULL;
2581			t->to_thread = NULL;
2582			if (t->buffer) {
2583				t->buffer->transaction = NULL;
2584				t->buffer = NULL;
2585			}
2586			t = t->to_parent;
2587		} else if (t->from == thread) {
2588			t->from = NULL;
2589			t = t->from_parent;
2590		} else
2591			BUG();
 
 
 
 
 
2592	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2593	if (send_reply)
2594		binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2595	binder_release_work(&thread->todo);
2596	kfree(thread);
2597	binder_stats_deleted(BINDER_STAT_THREAD);
2598	return active_transactions;
2599}
2600
2601static unsigned int binder_poll(struct file *filp,
2602				struct poll_table_struct *wait)
2603{
2604	struct binder_proc *proc = filp->private_data;
2605	struct binder_thread *thread = NULL;
2606	int wait_for_proc_work;
2607
2608	binder_lock(__func__);
2609
2610	thread = binder_get_thread(proc);
 
 
2611
2612	wait_for_proc_work = thread->transaction_stack == NULL &&
2613		list_empty(&thread->todo) && thread->return_error == BR_OK;
 
2614
2615	binder_unlock(__func__);
 
 
 
 
 
2616
2617	if (wait_for_proc_work) {
2618		if (binder_has_proc_work(proc, thread))
2619			return POLLIN;
2620		poll_wait(filp, &proc->wait, wait);
2621		if (binder_has_proc_work(proc, thread))
2622			return POLLIN;
2623	} else {
2624		if (binder_has_thread_work(thread))
2625			return POLLIN;
2626		poll_wait(filp, &thread->wait, wait);
2627		if (binder_has_thread_work(thread))
2628			return POLLIN;
2629	}
2630	return 0;
2631}
2632
2633static int binder_ioctl_write_read(struct file *filp,
2634				unsigned int cmd, unsigned long arg,
2635				struct binder_thread *thread)
2636{
2637	int ret = 0;
2638	struct binder_proc *proc = filp->private_data;
2639	unsigned int size = _IOC_SIZE(cmd);
2640	void __user *ubuf = (void __user *)arg;
2641	struct binder_write_read bwr;
2642
2643	if (size != sizeof(struct binder_write_read)) {
2644		ret = -EINVAL;
2645		goto out;
2646	}
2647	if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2648		ret = -EFAULT;
2649		goto out;
2650	}
2651	binder_debug(BINDER_DEBUG_READ_WRITE,
2652		     "%d:%d write %lld at %016llx, read %lld at %016llx\n",
2653		     proc->pid, thread->pid,
2654		     (u64)bwr.write_size, (u64)bwr.write_buffer,
2655		     (u64)bwr.read_size, (u64)bwr.read_buffer);
2656
2657	if (bwr.write_size > 0) {
2658		ret = binder_thread_write(proc, thread,
2659					  bwr.write_buffer,
2660					  bwr.write_size,
2661					  &bwr.write_consumed);
2662		trace_binder_write_done(ret);
2663		if (ret < 0) {
2664			bwr.read_consumed = 0;
2665			if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2666				ret = -EFAULT;
2667			goto out;
2668		}
2669	}
2670	if (bwr.read_size > 0) {
2671		ret = binder_thread_read(proc, thread, bwr.read_buffer,
2672					 bwr.read_size,
2673					 &bwr.read_consumed,
2674					 filp->f_flags & O_NONBLOCK);
2675		trace_binder_read_done(ret);
2676		if (!list_empty(&proc->todo))
2677			wake_up_interruptible(&proc->wait);
 
 
2678		if (ret < 0) {
2679			if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2680				ret = -EFAULT;
2681			goto out;
2682		}
2683	}
2684	binder_debug(BINDER_DEBUG_READ_WRITE,
2685		     "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
2686		     proc->pid, thread->pid,
2687		     (u64)bwr.write_consumed, (u64)bwr.write_size,
2688		     (u64)bwr.read_consumed, (u64)bwr.read_size);
2689	if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2690		ret = -EFAULT;
2691		goto out;
2692	}
2693out:
2694	return ret;
2695}
2696
2697static int binder_ioctl_set_ctx_mgr(struct file *filp)
 
2698{
2699	int ret = 0;
2700	struct binder_proc *proc = filp->private_data;
 
 
2701	kuid_t curr_euid = current_euid();
2702
2703	if (binder_context_mgr_node != NULL) {
 
2704		pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2705		ret = -EBUSY;
2706		goto out;
2707	}
2708	ret = security_binder_set_context_mgr(proc->tsk);
2709	if (ret < 0)
2710		goto out;
2711	if (uid_valid(binder_context_mgr_uid)) {
2712		if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
2713			pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2714			       from_kuid(&init_user_ns, curr_euid),
2715			       from_kuid(&init_user_ns,
2716					binder_context_mgr_uid));
2717			ret = -EPERM;
2718			goto out;
2719		}
2720	} else {
2721		binder_context_mgr_uid = curr_euid;
2722	}
2723	binder_context_mgr_node = binder_new_node(proc, 0, 0);
2724	if (binder_context_mgr_node == NULL) {
2725		ret = -ENOMEM;
2726		goto out;
2727	}
2728	binder_context_mgr_node->local_weak_refs++;
2729	binder_context_mgr_node->local_strong_refs++;
2730	binder_context_mgr_node->has_strong_ref = 1;
2731	binder_context_mgr_node->has_weak_ref = 1;
 
 
 
 
2732out:
 
2733	return ret;
2734}
2735
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2736static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2737{
2738	int ret;
2739	struct binder_proc *proc = filp->private_data;
2740	struct binder_thread *thread;
2741	unsigned int size = _IOC_SIZE(cmd);
2742	void __user *ubuf = (void __user *)arg;
2743
2744	/*pr_info("binder_ioctl: %d:%d %x %lx\n",
2745			proc->pid, current->pid, cmd, arg);*/
2746
2747	if (unlikely(current->mm != proc->vma_vm_mm)) {
2748		pr_err("current mm mismatch proc mm\n");
2749		return -EINVAL;
2750	}
2751	trace_binder_ioctl(cmd, arg);
2752
2753	ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2754	if (ret)
2755		goto err_unlocked;
2756
2757	binder_lock(__func__);
2758	thread = binder_get_thread(proc);
2759	if (thread == NULL) {
2760		ret = -ENOMEM;
2761		goto err;
2762	}
2763
2764	switch (cmd) {
2765	case BINDER_WRITE_READ:
2766		ret = binder_ioctl_write_read(filp, cmd, arg, thread);
2767		if (ret)
2768			goto err;
2769		break;
2770	case BINDER_SET_MAX_THREADS:
2771		if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2772			ret = -EINVAL;
2773			goto err;
2774		}
 
 
 
2775		break;
 
2776	case BINDER_SET_CONTEXT_MGR:
2777		ret = binder_ioctl_set_ctx_mgr(filp);
2778		if (ret)
2779			goto err;
2780		break;
2781	case BINDER_THREAD_EXIT:
2782		binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2783			     proc->pid, thread->pid);
2784		binder_free_thread(proc, thread);
2785		thread = NULL;
2786		break;
2787	case BINDER_VERSION: {
2788		struct binder_version __user *ver = ubuf;
2789
2790		if (size != sizeof(struct binder_version)) {
2791			ret = -EINVAL;
2792			goto err;
2793		}
2794		if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
2795			     &ver->protocol_version)) {
2796			ret = -EINVAL;
2797			goto err;
2798		}
2799		break;
2800	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2801	default:
2802		ret = -EINVAL;
2803		goto err;
2804	}
2805	ret = 0;
2806err:
2807	if (thread)
2808		thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2809	binder_unlock(__func__);
2810	wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2811	if (ret && ret != -ERESTARTSYS)
2812		pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2813err_unlocked:
2814	trace_binder_ioctl_done(ret);
2815	return ret;
2816}
2817
2818static void binder_vma_open(struct vm_area_struct *vma)
2819{
2820	struct binder_proc *proc = vma->vm_private_data;
2821
2822	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2823		     "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2824		     proc->pid, vma->vm_start, vma->vm_end,
2825		     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2826		     (unsigned long)pgprot_val(vma->vm_page_prot));
2827}
2828
2829static void binder_vma_close(struct vm_area_struct *vma)
2830{
2831	struct binder_proc *proc = vma->vm_private_data;
2832
2833	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2834		     "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2835		     proc->pid, vma->vm_start, vma->vm_end,
2836		     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2837		     (unsigned long)pgprot_val(vma->vm_page_prot));
2838	proc->vma = NULL;
2839	proc->vma_vm_mm = NULL;
2840	binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2841}
2842
2843static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2844{
2845	return VM_FAULT_SIGBUS;
2846}
2847
2848static const struct vm_operations_struct binder_vm_ops = {
2849	.open = binder_vma_open,
2850	.close = binder_vma_close,
2851	.fault = binder_vm_fault,
2852};
2853
2854static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2855{
2856	int ret;
2857	struct vm_struct *area;
2858	struct binder_proc *proc = filp->private_data;
2859	const char *failure_string;
2860	struct binder_buffer *buffer;
2861
2862	if (proc->tsk != current)
2863		return -EINVAL;
2864
2865	if ((vma->vm_end - vma->vm_start) > SZ_4M)
2866		vma->vm_end = vma->vm_start + SZ_4M;
2867
2868	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2869		     "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2870		     proc->pid, vma->vm_start, vma->vm_end,
2871		     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2872		     (unsigned long)pgprot_val(vma->vm_page_prot));
2873
2874	if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2875		ret = -EPERM;
2876		failure_string = "bad vm_flags";
2877		goto err_bad_arg;
2878	}
2879	vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2880
2881	mutex_lock(&binder_mmap_lock);
2882	if (proc->buffer) {
2883		ret = -EBUSY;
2884		failure_string = "already mapped";
2885		goto err_already_mapped;
2886	}
2887
2888	area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2889	if (area == NULL) {
2890		ret = -ENOMEM;
2891		failure_string = "get_vm_area";
2892		goto err_get_vm_area_failed;
2893	}
2894	proc->buffer = area->addr;
2895	proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2896	mutex_unlock(&binder_mmap_lock);
2897
2898#ifdef CONFIG_CPU_CACHE_VIPT
2899	if (cache_is_vipt_aliasing()) {
2900		while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2901			pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2902			vma->vm_start += PAGE_SIZE;
2903		}
2904	}
2905#endif
2906	proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2907	if (proc->pages == NULL) {
2908		ret = -ENOMEM;
2909		failure_string = "alloc page array";
2910		goto err_alloc_pages_failed;
2911	}
2912	proc->buffer_size = vma->vm_end - vma->vm_start;
2913
2914	vma->vm_ops = &binder_vm_ops;
2915	vma->vm_private_data = proc;
2916
2917	if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2918		ret = -ENOMEM;
2919		failure_string = "alloc small buf";
2920		goto err_alloc_small_buf_failed;
2921	}
2922	buffer = proc->buffer;
2923	INIT_LIST_HEAD(&proc->buffers);
2924	list_add(&buffer->entry, &proc->buffers);
2925	buffer->free = 1;
2926	binder_insert_free_buffer(proc, buffer);
2927	proc->free_async_space = proc->buffer_size / 2;
2928	barrier();
2929	proc->files = get_files_struct(current);
2930	proc->vma = vma;
2931	proc->vma_vm_mm = vma->vm_mm;
2932
2933	/*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2934		 proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2935	return 0;
2936
2937err_alloc_small_buf_failed:
2938	kfree(proc->pages);
2939	proc->pages = NULL;
2940err_alloc_pages_failed:
2941	mutex_lock(&binder_mmap_lock);
2942	vfree(proc->buffer);
2943	proc->buffer = NULL;
2944err_get_vm_area_failed:
2945err_already_mapped:
2946	mutex_unlock(&binder_mmap_lock);
2947err_bad_arg:
2948	pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2949	       proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2950	return ret;
2951}
2952
2953static int binder_open(struct inode *nodp, struct file *filp)
2954{
2955	struct binder_proc *proc;
 
 
 
2956
2957	binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2958		     current->group_leader->pid, current->pid);
2959
2960	proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2961	if (proc == NULL)
2962		return -ENOMEM;
2963	get_task_struct(current);
2964	proc->tsk = current;
2965	proc->vma_vm_mm = current->mm;
 
2966	INIT_LIST_HEAD(&proc->todo);
2967	init_waitqueue_head(&proc->wait);
2968	proc->default_priority = task_nice(current);
2969
2970	binder_lock(__func__);
 
 
 
 
 
 
 
 
 
2971
2972	binder_stats_created(BINDER_STAT_PROC);
2973	hlist_add_head(&proc->proc_node, &binder_procs);
2974	proc->pid = current->group_leader->pid;
2975	INIT_LIST_HEAD(&proc->delivered_death);
 
2976	filp->private_data = proc;
2977
2978	binder_unlock(__func__);
 
 
2979
2980	if (binder_debugfs_dir_entry_proc) {
2981		char strbuf[11];
2982
2983		snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2984		proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2985			binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2986	}
2987
2988	return 0;
2989}
2990
2991static int binder_flush(struct file *filp, fl_owner_t id)
2992{
2993	struct binder_proc *proc = filp->private_data;
2994
2995	binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2996
2997	return 0;
2998}
2999
3000static void binder_deferred_flush(struct binder_proc *proc)
3001{
3002	struct rb_node *n;
3003	int wake_count = 0;
3004
 
3005	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
3006		struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
3007
3008		thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3009		if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
3010			wake_up_interruptible(&thread->wait);
3011			wake_count++;
3012		}
3013	}
3014	wake_up_interruptible_all(&proc->wait);
3015
3016	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3017		     "binder_flush: %d woke %d threads\n", proc->pid,
3018		     wake_count);
3019}
3020
3021static int binder_release(struct inode *nodp, struct file *filp)
3022{
3023	struct binder_proc *proc = filp->private_data;
3024
3025	debugfs_remove(proc->debugfs_entry);
 
 
 
 
 
 
3026	binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
3027
3028	return 0;
3029}
3030
3031static int binder_node_release(struct binder_node *node, int refs)
3032{
3033	struct binder_ref *ref;
3034	int death = 0;
 
3035
3036	list_del_init(&node->work.entry);
3037	binder_release_work(&node->async_todo);
3038
3039	if (hlist_empty(&node->refs)) {
3040		kfree(node);
3041		binder_stats_deleted(BINDER_STAT_NODE);
 
 
 
 
 
 
 
 
3042
3043		return refs;
3044	}
3045
3046	node->proc = NULL;
3047	node->local_strong_refs = 0;
3048	node->local_weak_refs = 0;
 
 
 
3049	hlist_add_head(&node->dead_node, &binder_dead_nodes);
 
3050
3051	hlist_for_each_entry(ref, &node->refs, node_entry) {
3052		refs++;
3053
3054		if (!ref->death)
 
 
 
 
 
 
 
3055			continue;
 
3056
3057		death++;
3058
3059		if (list_empty(&ref->death->work.entry)) {
3060			ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3061			list_add_tail(&ref->death->work.entry,
3062				      &ref->proc->todo);
3063			wake_up_interruptible(&ref->proc->wait);
3064		} else
3065			BUG();
3066	}
3067
3068	binder_debug(BINDER_DEBUG_DEAD_BINDER,
3069		     "node %d now dead, refs %d, death %d\n",
3070		     node->debug_id, refs, death);
 
 
3071
3072	return refs;
3073}
3074
3075static void binder_deferred_release(struct binder_proc *proc)
3076{
3077	struct binder_transaction *t;
3078	struct rb_node *n;
3079	int threads, nodes, incoming_refs, outgoing_refs, buffers,
3080		active_transactions, page_count;
3081
3082	BUG_ON(proc->vma);
3083	BUG_ON(proc->files);
3084
 
3085	hlist_del(&proc->proc_node);
 
3086
3087	if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
 
 
3088		binder_debug(BINDER_DEBUG_DEAD_BINDER,
3089			     "%s: %d context_mgr_node gone\n",
3090			     __func__, proc->pid);
3091		binder_context_mgr_node = NULL;
3092	}
 
 
 
 
 
 
 
3093
 
3094	threads = 0;
3095	active_transactions = 0;
3096	while ((n = rb_first(&proc->threads))) {
3097		struct binder_thread *thread;
3098
3099		thread = rb_entry(n, struct binder_thread, rb_node);
 
3100		threads++;
3101		active_transactions += binder_free_thread(proc, thread);
 
3102	}
3103
3104	nodes = 0;
3105	incoming_refs = 0;
3106	while ((n = rb_first(&proc->nodes))) {
3107		struct binder_node *node;
3108
3109		node = rb_entry(n, struct binder_node, rb_node);
3110		nodes++;
 
 
 
 
 
 
3111		rb_erase(&node->rb_node, &proc->nodes);
 
3112		incoming_refs = binder_node_release(node, incoming_refs);
 
3113	}
 
3114
3115	outgoing_refs = 0;
 
3116	while ((n = rb_first(&proc->refs_by_desc))) {
3117		struct binder_ref *ref;
3118
3119		ref = rb_entry(n, struct binder_ref, rb_node_desc);
3120		outgoing_refs++;
3121		binder_delete_ref(ref);
3122	}
3123
3124	binder_release_work(&proc->todo);
3125	binder_release_work(&proc->delivered_death);
3126
3127	buffers = 0;
3128	while ((n = rb_first(&proc->allocated_buffers))) {
3129		struct binder_buffer *buffer;
3130
3131		buffer = rb_entry(n, struct binder_buffer, rb_node);
3132
3133		t = buffer->transaction;
3134		if (t) {
3135			t->buffer = NULL;
3136			buffer->transaction = NULL;
3137			pr_err("release proc %d, transaction %d, not freed\n",
3138			       proc->pid, t->debug_id);
3139			/*BUG();*/
3140		}
3141
3142		binder_free_buf(proc, buffer);
3143		buffers++;
3144	}
 
3145
3146	binder_stats_deleted(BINDER_STAT_PROC);
3147
3148	page_count = 0;
3149	if (proc->pages) {
3150		int i;
3151
3152		for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3153			void *page_addr;
3154
3155			if (!proc->pages[i])
3156				continue;
3157
3158			page_addr = proc->buffer + i * PAGE_SIZE;
3159			binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3160				     "%s: %d: page %d at %p not freed\n",
3161				     __func__, proc->pid, i, page_addr);
3162			unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3163			__free_page(proc->pages[i]);
3164			page_count++;
3165		}
3166		kfree(proc->pages);
3167		vfree(proc->buffer);
3168	}
3169
3170	put_task_struct(proc->tsk);
3171
3172	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3173		     "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3174		     __func__, proc->pid, threads, nodes, incoming_refs,
3175		     outgoing_refs, active_transactions, buffers, page_count);
3176
3177	kfree(proc);
3178}
3179
3180static void binder_deferred_func(struct work_struct *work)
3181{
3182	struct binder_proc *proc;
3183	struct files_struct *files;
3184
3185	int defer;
3186
3187	do {
3188		binder_lock(__func__);
3189		mutex_lock(&binder_deferred_lock);
3190		if (!hlist_empty(&binder_deferred_list)) {
3191			proc = hlist_entry(binder_deferred_list.first,
3192					struct binder_proc, deferred_work_node);
3193			hlist_del_init(&proc->deferred_work_node);
3194			defer = proc->deferred_work;
3195			proc->deferred_work = 0;
3196		} else {
3197			proc = NULL;
3198			defer = 0;
3199		}
3200		mutex_unlock(&binder_deferred_lock);
3201
3202		files = NULL;
3203		if (defer & BINDER_DEFERRED_PUT_FILES) {
3204			files = proc->files;
3205			if (files)
3206				proc->files = NULL;
3207		}
3208
3209		if (defer & BINDER_DEFERRED_FLUSH)
3210			binder_deferred_flush(proc);
3211
3212		if (defer & BINDER_DEFERRED_RELEASE)
3213			binder_deferred_release(proc); /* frees proc */
3214
3215		binder_unlock(__func__);
3216		if (files)
3217			put_files_struct(files);
3218	} while (proc);
3219}
3220static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3221
3222static void
3223binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3224{
3225	mutex_lock(&binder_deferred_lock);
3226	proc->deferred_work |= defer;
3227	if (hlist_unhashed(&proc->deferred_work_node)) {
3228		hlist_add_head(&proc->deferred_work_node,
3229				&binder_deferred_list);
3230		queue_work(binder_deferred_workqueue, &binder_deferred_work);
3231	}
3232	mutex_unlock(&binder_deferred_lock);
3233}
3234
3235static void print_binder_transaction(struct seq_file *m, const char *prefix,
3236				     struct binder_transaction *t)
 
 
3237{
 
 
 
 
 
3238	seq_printf(m,
3239		   "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3240		   prefix, t->debug_id, t,
3241		   t->from ? t->from->proc->pid : 0,
3242		   t->from ? t->from->pid : 0,
3243		   t->to_proc ? t->to_proc->pid : 0,
3244		   t->to_thread ? t->to_thread->pid : 0,
3245		   t->code, t->flags, t->priority, t->need_reply);
3246	if (t->buffer == NULL) {
3247		seq_puts(m, " buffer free\n");
 
 
 
 
 
 
3248		return;
3249	}
3250	if (t->buffer->target_node)
3251		seq_printf(m, " node %d",
3252			   t->buffer->target_node->debug_id);
3253	seq_printf(m, " size %zd:%zd data %p\n",
3254		   t->buffer->data_size, t->buffer->offsets_size,
3255		   t->buffer->data);
3256}
3257
3258static void print_binder_buffer(struct seq_file *m, const char *prefix,
3259				struct binder_buffer *buffer)
3260{
3261	seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3262		   prefix, buffer->debug_id, buffer->data,
 
 
3263		   buffer->data_size, buffer->offsets_size,
3264		   buffer->transaction ? "active" : "delivered");
3265}
3266
3267static void print_binder_work(struct seq_file *m, const char *prefix,
3268			      const char *transaction_prefix,
3269			      struct binder_work *w)
 
 
3270{
3271	struct binder_node *node;
3272	struct binder_transaction *t;
3273
3274	switch (w->type) {
3275	case BINDER_WORK_TRANSACTION:
3276		t = container_of(w, struct binder_transaction, work);
3277		print_binder_transaction(m, transaction_prefix, t);
 
3278		break;
 
 
 
 
 
 
 
3279	case BINDER_WORK_TRANSACTION_COMPLETE:
3280		seq_printf(m, "%stransaction complete\n", prefix);
3281		break;
3282	case BINDER_WORK_NODE:
3283		node = container_of(w, struct binder_node, work);
3284		seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3285			   prefix, node->debug_id,
3286			   (u64)node->ptr, (u64)node->cookie);
3287		break;
3288	case BINDER_WORK_DEAD_BINDER:
3289		seq_printf(m, "%shas dead binder\n", prefix);
3290		break;
3291	case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3292		seq_printf(m, "%shas cleared dead binder\n", prefix);
3293		break;
3294	case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3295		seq_printf(m, "%shas cleared death notification\n", prefix);
3296		break;
3297	default:
3298		seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3299		break;
3300	}
3301}
3302
3303static void print_binder_thread(struct seq_file *m,
3304				struct binder_thread *thread,
3305				int print_always)
3306{
3307	struct binder_transaction *t;
3308	struct binder_work *w;
3309	size_t start_pos = m->count;
3310	size_t header_pos;
3311
3312	seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
 
 
 
3313	header_pos = m->count;
3314	t = thread->transaction_stack;
3315	while (t) {
3316		if (t->from == thread) {
3317			print_binder_transaction(m,
3318						 "    outgoing transaction", t);
3319			t = t->from_parent;
3320		} else if (t->to_thread == thread) {
3321			print_binder_transaction(m,
3322						 "    incoming transaction", t);
3323			t = t->to_parent;
3324		} else {
3325			print_binder_transaction(m, "    bad transaction", t);
 
3326			t = NULL;
3327		}
3328	}
3329	list_for_each_entry(w, &thread->todo, entry) {
3330		print_binder_work(m, "    ", "    pending transaction", w);
 
3331	}
3332	if (!print_always && m->count == header_pos)
3333		m->count = start_pos;
3334}
3335
3336static void print_binder_node(struct seq_file *m, struct binder_node *node)
 
3337{
3338	struct binder_ref *ref;
3339	struct binder_work *w;
3340	int count;
3341
3342	count = 0;
3343	hlist_for_each_entry(ref, &node->refs, node_entry)
3344		count++;
3345
3346	seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3347		   node->debug_id, (u64)node->ptr, (u64)node->cookie,
3348		   node->has_strong_ref, node->has_weak_ref,
3349		   node->local_strong_refs, node->local_weak_refs,
3350		   node->internal_strong_refs, count);
3351	if (count) {
3352		seq_puts(m, " proc");
3353		hlist_for_each_entry(ref, &node->refs, node_entry)
3354			seq_printf(m, " %d", ref->proc->pid);
3355	}
3356	seq_puts(m, "\n");
3357	list_for_each_entry(w, &node->async_todo, entry)
3358		print_binder_work(m, "    ",
3359				  "    pending async transaction", w);
 
 
3360}
3361
3362static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3363{
3364	seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3365		   ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3366		   ref->node->debug_id, ref->strong, ref->weak, ref->death);
 
 
 
 
 
3367}
3368
3369static void print_binder_proc(struct seq_file *m,
3370			      struct binder_proc *proc, int print_all)
3371{
3372	struct binder_work *w;
3373	struct rb_node *n;
3374	size_t start_pos = m->count;
3375	size_t header_pos;
 
3376
3377	seq_printf(m, "proc %d\n", proc->pid);
 
3378	header_pos = m->count;
3379
 
3380	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3381		print_binder_thread(m, rb_entry(n, struct binder_thread,
3382						rb_node), print_all);
 
3383	for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3384		struct binder_node *node = rb_entry(n, struct binder_node,
3385						    rb_node);
3386		if (print_all || node->has_async_transaction)
3387			print_binder_node(m, node);
3388	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3389	if (print_all) {
 
3390		for (n = rb_first(&proc->refs_by_desc);
3391		     n != NULL;
3392		     n = rb_next(n))
3393			print_binder_ref(m, rb_entry(n, struct binder_ref,
3394						     rb_node_desc));
 
 
3395	}
3396	for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3397		print_binder_buffer(m, "  buffer",
3398				    rb_entry(n, struct binder_buffer, rb_node));
3399	list_for_each_entry(w, &proc->todo, entry)
3400		print_binder_work(m, "  ", "  pending transaction", w);
 
3401	list_for_each_entry(w, &proc->delivered_death, entry) {
3402		seq_puts(m, "  has delivered dead binder\n");
3403		break;
3404	}
 
3405	if (!print_all && m->count == header_pos)
3406		m->count = start_pos;
3407}
3408
3409static const char * const binder_return_strings[] = {
3410	"BR_ERROR",
3411	"BR_OK",
3412	"BR_TRANSACTION",
3413	"BR_REPLY",
3414	"BR_ACQUIRE_RESULT",
3415	"BR_DEAD_REPLY",
3416	"BR_TRANSACTION_COMPLETE",
3417	"BR_INCREFS",
3418	"BR_ACQUIRE",
3419	"BR_RELEASE",
3420	"BR_DECREFS",
3421	"BR_ATTEMPT_ACQUIRE",
3422	"BR_NOOP",
3423	"BR_SPAWN_LOOPER",
3424	"BR_FINISHED",
3425	"BR_DEAD_BINDER",
3426	"BR_CLEAR_DEATH_NOTIFICATION_DONE",
3427	"BR_FAILED_REPLY"
3428};
3429
3430static const char * const binder_command_strings[] = {
3431	"BC_TRANSACTION",
3432	"BC_REPLY",
3433	"BC_ACQUIRE_RESULT",
3434	"BC_FREE_BUFFER",
3435	"BC_INCREFS",
3436	"BC_ACQUIRE",
3437	"BC_RELEASE",
3438	"BC_DECREFS",
3439	"BC_INCREFS_DONE",
3440	"BC_ACQUIRE_DONE",
3441	"BC_ATTEMPT_ACQUIRE",
3442	"BC_REGISTER_LOOPER",
3443	"BC_ENTER_LOOPER",
3444	"BC_EXIT_LOOPER",
3445	"BC_REQUEST_DEATH_NOTIFICATION",
3446	"BC_CLEAR_DEATH_NOTIFICATION",
3447	"BC_DEAD_BINDER_DONE"
 
 
3448};
3449
3450static const char * const binder_objstat_strings[] = {
3451	"proc",
3452	"thread",
3453	"node",
3454	"ref",
3455	"death",
3456	"transaction",
3457	"transaction_complete"
3458};
3459
3460static void print_binder_stats(struct seq_file *m, const char *prefix,
3461			       struct binder_stats *stats)
3462{
3463	int i;
3464
3465	BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3466		     ARRAY_SIZE(binder_command_strings));
3467	for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3468		if (stats->bc[i])
 
 
3469			seq_printf(m, "%s%s: %d\n", prefix,
3470				   binder_command_strings[i], stats->bc[i]);
3471	}
3472
3473	BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3474		     ARRAY_SIZE(binder_return_strings));
3475	for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3476		if (stats->br[i])
 
 
3477			seq_printf(m, "%s%s: %d\n", prefix,
3478				   binder_return_strings[i], stats->br[i]);
3479	}
3480
3481	BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3482		     ARRAY_SIZE(binder_objstat_strings));
3483	BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3484		     ARRAY_SIZE(stats->obj_deleted));
3485	for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3486		if (stats->obj_created[i] || stats->obj_deleted[i])
3487			seq_printf(m, "%s%s: active %d total %d\n", prefix,
 
 
 
 
3488				binder_objstat_strings[i],
3489				stats->obj_created[i] - stats->obj_deleted[i],
3490				stats->obj_created[i]);
3491	}
3492}
3493
3494static void print_binder_proc_stats(struct seq_file *m,
3495				    struct binder_proc *proc)
3496{
3497	struct binder_work *w;
 
3498	struct rb_node *n;
3499	int count, strong, weak;
 
 
3500
3501	seq_printf(m, "proc %d\n", proc->pid);
 
3502	count = 0;
 
 
3503	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3504		count++;
 
 
 
 
3505	seq_printf(m, "  threads: %d\n", count);
3506	seq_printf(m, "  requested threads: %d+%d/%d\n"
3507			"  ready threads %d\n"
3508			"  free async space %zd\n", proc->requested_threads,
3509			proc->requested_threads_started, proc->max_threads,
3510			proc->ready_threads, proc->free_async_space);
 
3511	count = 0;
3512	for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3513		count++;
 
3514	seq_printf(m, "  nodes: %d\n", count);
3515	count = 0;
3516	strong = 0;
3517	weak = 0;
 
3518	for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3519		struct binder_ref *ref = rb_entry(n, struct binder_ref,
3520						  rb_node_desc);
3521		count++;
3522		strong += ref->strong;
3523		weak += ref->weak;
3524	}
 
3525	seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3526
3527	count = 0;
3528	for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3529		count++;
3530	seq_printf(m, "  buffers: %d\n", count);
3531
 
 
3532	count = 0;
 
3533	list_for_each_entry(w, &proc->todo, entry) {
3534		switch (w->type) {
3535		case BINDER_WORK_TRANSACTION:
3536			count++;
3537			break;
3538		default:
3539			break;
3540		}
3541	}
 
3542	seq_printf(m, "  pending transactions: %d\n", count);
3543
3544	print_binder_stats(m, "  ", &proc->stats);
3545}
3546
3547
3548static int binder_state_show(struct seq_file *m, void *unused)
3549{
3550	struct binder_proc *proc;
3551	struct binder_node *node;
3552	int do_lock = !binder_debug_no_lock;
3553
3554	if (do_lock)
3555		binder_lock(__func__);
3556
3557	seq_puts(m, "binder state:\n");
3558
 
3559	if (!hlist_empty(&binder_dead_nodes))
3560		seq_puts(m, "dead nodes:\n");
3561	hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3562		print_binder_node(m, node);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3563
 
3564	hlist_for_each_entry(proc, &binder_procs, proc_node)
3565		print_binder_proc(m, proc, 1);
3566	if (do_lock)
3567		binder_unlock(__func__);
3568	return 0;
3569}
3570
3571static int binder_stats_show(struct seq_file *m, void *unused)
3572{
3573	struct binder_proc *proc;
3574	int do_lock = !binder_debug_no_lock;
3575
3576	if (do_lock)
3577		binder_lock(__func__);
3578
3579	seq_puts(m, "binder stats:\n");
3580
3581	print_binder_stats(m, "", &binder_stats);
3582
 
3583	hlist_for_each_entry(proc, &binder_procs, proc_node)
3584		print_binder_proc_stats(m, proc);
3585	if (do_lock)
3586		binder_unlock(__func__);
3587	return 0;
3588}
3589
3590static int binder_transactions_show(struct seq_file *m, void *unused)
3591{
3592	struct binder_proc *proc;
3593	int do_lock = !binder_debug_no_lock;
3594
3595	if (do_lock)
3596		binder_lock(__func__);
3597
3598	seq_puts(m, "binder transactions:\n");
 
3599	hlist_for_each_entry(proc, &binder_procs, proc_node)
3600		print_binder_proc(m, proc, 0);
3601	if (do_lock)
3602		binder_unlock(__func__);
3603	return 0;
3604}
3605
3606static int binder_proc_show(struct seq_file *m, void *unused)
3607{
3608	struct binder_proc *itr;
3609	struct binder_proc *proc = m->private;
3610	int do_lock = !binder_debug_no_lock;
3611	bool valid_proc = false;
3612
3613	if (do_lock)
3614		binder_lock(__func__);
3615
 
3616	hlist_for_each_entry(itr, &binder_procs, proc_node) {
3617		if (itr == proc) {
3618			valid_proc = true;
3619			break;
3620		}
3621	}
3622	if (valid_proc) {
3623		seq_puts(m, "binder proc state:\n");
3624		print_binder_proc(m, proc, 1);
3625	}
3626	if (do_lock)
3627		binder_unlock(__func__);
3628	return 0;
3629}
3630
3631static void print_binder_transaction_log_entry(struct seq_file *m,
3632					struct binder_transaction_log_entry *e)
3633{
 
 
 
 
 
 
3634	seq_printf(m,
3635		   "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3636		   e->debug_id, (e->call_type == 2) ? "reply" :
3637		   ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3638		   e->from_thread, e->to_proc, e->to_thread, e->to_node,
3639		   e->target_handle, e->data_size, e->offsets_size);
 
 
 
 
 
 
 
 
 
3640}
3641
3642static int binder_transaction_log_show(struct seq_file *m, void *unused)
3643{
3644	struct binder_transaction_log *log = m->private;
 
 
 
3645	int i;
3646
3647	if (log->full) {
3648		for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3649			print_binder_transaction_log_entry(m, &log->entry[i]);
 
 
 
 
 
 
3650	}
3651	for (i = 0; i < log->next; i++)
3652		print_binder_transaction_log_entry(m, &log->entry[i]);
3653	return 0;
3654}
3655
3656static const struct file_operations binder_fops = {
3657	.owner = THIS_MODULE,
3658	.poll = binder_poll,
3659	.unlocked_ioctl = binder_ioctl,
3660	.compat_ioctl = binder_ioctl,
3661	.mmap = binder_mmap,
3662	.open = binder_open,
3663	.flush = binder_flush,
3664	.release = binder_release,
3665};
3666
3667static struct miscdevice binder_miscdev = {
3668	.minor = MISC_DYNAMIC_MINOR,
3669	.name = "binder",
3670	.fops = &binder_fops
3671};
3672
3673BINDER_DEBUG_ENTRY(state);
3674BINDER_DEBUG_ENTRY(stats);
3675BINDER_DEBUG_ENTRY(transactions);
3676BINDER_DEBUG_ENTRY(transaction_log);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3677
3678static int __init binder_init(void)
3679{
3680	int ret;
 
 
 
 
3681
3682	binder_deferred_workqueue = create_singlethread_workqueue("binder");
3683	if (!binder_deferred_workqueue)
3684		return -ENOMEM;
 
 
 
3685
3686	binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3687	if (binder_debugfs_dir_entry_root)
3688		binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3689						 binder_debugfs_dir_entry_root);
3690	ret = misc_register(&binder_miscdev);
3691	if (binder_debugfs_dir_entry_root) {
3692		debugfs_create_file("state",
3693				    S_IRUGO,
3694				    binder_debugfs_dir_entry_root,
3695				    NULL,
3696				    &binder_state_fops);
3697		debugfs_create_file("stats",
3698				    S_IRUGO,
3699				    binder_debugfs_dir_entry_root,
3700				    NULL,
3701				    &binder_stats_fops);
3702		debugfs_create_file("transactions",
3703				    S_IRUGO,
3704				    binder_debugfs_dir_entry_root,
3705				    NULL,
3706				    &binder_transactions_fops);
3707		debugfs_create_file("transaction_log",
3708				    S_IRUGO,
3709				    binder_debugfs_dir_entry_root,
3710				    &binder_transaction_log,
3711				    &binder_transaction_log_fops);
3712		debugfs_create_file("failed_transaction_log",
3713				    S_IRUGO,
3714				    binder_debugfs_dir_entry_root,
3715				    &binder_transaction_log_failed,
3716				    &binder_transaction_log_fops);
3717	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3718	return ret;
3719}
3720
3721device_initcall(binder_init);
3722
3723#define CREATE_TRACE_POINTS
3724#include "binder_trace.h"
3725
3726MODULE_LICENSE("GPL v2");