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;
  62
  63#define BINDER_DEBUG_ENTRY(name) \
  64static int binder_##name##_open(struct inode *inode, struct file *file) \
  65{ \
  66	return single_open(file, binder_##name##_show, inode->i_private); \
  67} \
  68\
  69static const struct file_operations binder_##name##_fops = { \
  70	.owner = THIS_MODULE, \
  71	.open = binder_##name##_open, \
  72	.read = seq_read, \
  73	.llseek = seq_lseek, \
  74	.release = single_release, \
  75}
  76
  77static int binder_proc_show(struct seq_file *m, void *unused);
  78BINDER_DEBUG_ENTRY(proc);
  79
  80/* This is only defined in include/asm-arm/sizes.h */
  81#ifndef SZ_1K
  82#define SZ_1K                               0x400
  83#endif
  84
  85#ifndef SZ_4M
  86#define SZ_4M                               0x400000
  87#endif
  88
  89#define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  90
  91#define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  92
  93enum {
  94	BINDER_DEBUG_USER_ERROR             = 1U << 0,
  95	BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  96	BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  97	BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  98	BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
  99	BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
 100	BINDER_DEBUG_READ_WRITE             = 1U << 6,
 101	BINDER_DEBUG_USER_REFS              = 1U << 7,
 102	BINDER_DEBUG_THREADS                = 1U << 8,
 103	BINDER_DEBUG_TRANSACTION            = 1U << 9,
 104	BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
 105	BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
 106	BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
 107	BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
 108	BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
 109	BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
 110};
 111static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 112	BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 113module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
 114
 115static bool binder_debug_no_lock;
 116module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
 117
 118static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 119static int binder_stop_on_user_error;
 120
 121static int binder_set_stop_on_user_error(const char *val,
 122					 struct kernel_param *kp)
 123{
 124	int ret;
 125
 126	ret = param_set_int(val, kp);
 127	if (binder_stop_on_user_error < 2)
 128		wake_up(&binder_user_error_wait);
 129	return ret;
 130}
 131module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 132	param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 133
 134#define binder_debug(mask, x...) \
 135	do { \
 136		if (binder_debug_mask & mask) \
 137			pr_info(x); \
 138	} while (0)
 139
 140#define binder_user_error(x...) \
 141	do { \
 142		if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 143			pr_info(x); \
 144		if (binder_stop_on_user_error) \
 145			binder_stop_on_user_error = 2; \
 146	} while (0)
 147
 148enum binder_stat_types {
 149	BINDER_STAT_PROC,
 150	BINDER_STAT_THREAD,
 151	BINDER_STAT_NODE,
 152	BINDER_STAT_REF,
 153	BINDER_STAT_DEATH,
 154	BINDER_STAT_TRANSACTION,
 155	BINDER_STAT_TRANSACTION_COMPLETE,
 156	BINDER_STAT_COUNT
 157};
 158
 159struct binder_stats {
 160	int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 161	int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
 162	int obj_created[BINDER_STAT_COUNT];
 163	int obj_deleted[BINDER_STAT_COUNT];
 164};
 165
 166static struct binder_stats binder_stats;
 167
 168static inline void binder_stats_deleted(enum binder_stat_types type)
 169{
 170	binder_stats.obj_deleted[type]++;
 171}
 172
 173static inline void binder_stats_created(enum binder_stat_types type)
 174{
 175	binder_stats.obj_created[type]++;
 176}
 177
 178struct binder_transaction_log_entry {
 179	int debug_id;
 180	int call_type;
 181	int from_proc;
 182	int from_thread;
 183	int target_handle;
 184	int to_proc;
 185	int to_thread;
 186	int to_node;
 187	int data_size;
 188	int offsets_size;
 189};
 190struct binder_transaction_log {
 191	int next;
 192	int full;
 193	struct binder_transaction_log_entry entry[32];
 194};
 195static struct binder_transaction_log binder_transaction_log;
 196static struct binder_transaction_log binder_transaction_log_failed;
 197
 198static struct binder_transaction_log_entry *binder_transaction_log_add(
 199	struct binder_transaction_log *log)
 200{
 201	struct binder_transaction_log_entry *e;
 202
 203	e = &log->entry[log->next];
 204	memset(e, 0, sizeof(*e));
 205	log->next++;
 206	if (log->next == ARRAY_SIZE(log->entry)) {
 207		log->next = 0;
 208		log->full = 1;
 209	}
 210	return e;
 211}
 212
 213struct binder_work {
 214	struct list_head entry;
 215	enum {
 216		BINDER_WORK_TRANSACTION = 1,
 217		BINDER_WORK_TRANSACTION_COMPLETE,
 218		BINDER_WORK_NODE,
 219		BINDER_WORK_DEAD_BINDER,
 220		BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 221		BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 222	} type;
 223};
 224
 225struct binder_node {
 226	int debug_id;
 227	struct binder_work work;
 228	union {
 229		struct rb_node rb_node;
 230		struct hlist_node dead_node;
 231	};
 232	struct binder_proc *proc;
 233	struct hlist_head refs;
 234	int internal_strong_refs;
 235	int local_weak_refs;
 236	int local_strong_refs;
 237	binder_uintptr_t ptr;
 238	binder_uintptr_t cookie;
 239	unsigned has_strong_ref:1;
 240	unsigned pending_strong_ref:1;
 241	unsigned has_weak_ref:1;
 242	unsigned pending_weak_ref:1;
 243	unsigned has_async_transaction:1;
 244	unsigned accept_fds:1;
 245	unsigned min_priority:8;
 246	struct list_head async_todo;
 247};
 248
 249struct binder_ref_death {
 250	struct binder_work work;
 251	binder_uintptr_t cookie;
 252};
 253
 254struct binder_ref {
 255	/* Lookups needed: */
 256	/*   node + proc => ref (transaction) */
 257	/*   desc + proc => ref (transaction, inc/dec ref) */
 258	/*   node => refs + procs (proc exit) */
 259	int debug_id;
 260	struct rb_node rb_node_desc;
 261	struct rb_node rb_node_node;
 262	struct hlist_node node_entry;
 263	struct binder_proc *proc;
 264	struct binder_node *node;
 265	uint32_t desc;
 266	int strong;
 267	int weak;
 268	struct binder_ref_death *death;
 269};
 270
 271struct binder_buffer {
 272	struct list_head entry; /* free and allocated entries by address */
 273	struct rb_node rb_node; /* free entry by size or allocated entry */
 274				/* by address */
 275	unsigned free:1;
 276	unsigned allow_user_free:1;
 277	unsigned async_transaction:1;
 278	unsigned debug_id:29;
 279
 280	struct binder_transaction *transaction;
 281
 282	struct binder_node *target_node;
 283	size_t data_size;
 284	size_t offsets_size;
 285	uint8_t data[0];
 286};
 287
 288enum binder_deferred_state {
 289	BINDER_DEFERRED_PUT_FILES    = 0x01,
 290	BINDER_DEFERRED_FLUSH        = 0x02,
 291	BINDER_DEFERRED_RELEASE      = 0x04,
 292};
 293
 294struct binder_proc {
 295	struct hlist_node proc_node;
 296	struct rb_root threads;
 297	struct rb_root nodes;
 298	struct rb_root refs_by_desc;
 299	struct rb_root refs_by_node;
 300	int pid;
 301	struct vm_area_struct *vma;
 302	struct mm_struct *vma_vm_mm;
 303	struct task_struct *tsk;
 304	struct files_struct *files;
 305	struct hlist_node deferred_work_node;
 306	int deferred_work;
 307	void *buffer;
 308	ptrdiff_t user_buffer_offset;
 309
 310	struct list_head buffers;
 311	struct rb_root free_buffers;
 312	struct rb_root allocated_buffers;
 313	size_t free_async_space;
 314
 315	struct page **pages;
 316	size_t buffer_size;
 317	uint32_t buffer_free;
 318	struct list_head todo;
 319	wait_queue_head_t wait;
 320	struct binder_stats stats;
 321	struct list_head delivered_death;
 322	int max_threads;
 323	int requested_threads;
 324	int requested_threads_started;
 325	int ready_threads;
 326	long default_priority;
 327	struct dentry *debugfs_entry;
 328};
 329
 330enum {
 331	BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 332	BINDER_LOOPER_STATE_ENTERED     = 0x02,
 333	BINDER_LOOPER_STATE_EXITED      = 0x04,
 334	BINDER_LOOPER_STATE_INVALID     = 0x08,
 335	BINDER_LOOPER_STATE_WAITING     = 0x10,
 336	BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 337};
 338
 339struct binder_thread {
 340	struct binder_proc *proc;
 341	struct rb_node rb_node;
 342	int pid;
 343	int looper;
 344	struct binder_transaction *transaction_stack;
 345	struct list_head todo;
 346	uint32_t return_error; /* Write failed, return error code in read buf */
 347	uint32_t return_error2; /* Write failed, return error code in read */
 348		/* buffer. Used when sending a reply to a dead process that */
 349		/* we are also waiting on */
 350	wait_queue_head_t wait;
 351	struct binder_stats stats;
 352};
 353
 354struct binder_transaction {
 355	int debug_id;
 356	struct binder_work work;
 357	struct binder_thread *from;
 358	struct binder_transaction *from_parent;
 359	struct binder_proc *to_proc;
 360	struct binder_thread *to_thread;
 361	struct binder_transaction *to_parent;
 362	unsigned need_reply:1;
 363	/* unsigned is_dead:1; */	/* not used at the moment */
 364
 365	struct binder_buffer *buffer;
 366	unsigned int	code;
 367	unsigned int	flags;
 368	long	priority;
 369	long	saved_priority;
 370	kuid_t	sender_euid;
 371};
 372
 373static void
 374binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 375
 376static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 377{
 378	struct files_struct *files = proc->files;
 379	unsigned long rlim_cur;
 380	unsigned long irqs;
 381
 382	if (files == NULL)
 383		return -ESRCH;
 384
 385	if (!lock_task_sighand(proc->tsk, &irqs))
 386		return -EMFILE;
 387
 388	rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 389	unlock_task_sighand(proc->tsk, &irqs);
 390
 391	return __alloc_fd(files, 0, rlim_cur, flags);
 392}
 393
 394/*
 395 * copied from fd_install
 396 */
 397static void task_fd_install(
 398	struct binder_proc *proc, unsigned int fd, struct file *file)
 399{
 400	if (proc->files)
 401		__fd_install(proc->files, fd, file);
 402}
 403
 404/*
 405 * copied from sys_close
 406 */
 407static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 408{
 409	int retval;
 410
 411	if (proc->files == NULL)
 412		return -ESRCH;
 413
 414	retval = __close_fd(proc->files, fd);
 415	/* can't restart close syscall because file table entry was cleared */
 416	if (unlikely(retval == -ERESTARTSYS ||
 417		     retval == -ERESTARTNOINTR ||
 418		     retval == -ERESTARTNOHAND ||
 419		     retval == -ERESTART_RESTARTBLOCK))
 420		retval = -EINTR;
 421
 422	return retval;
 423}
 424
 425static inline void binder_lock(const char *tag)
 426{
 427	trace_binder_lock(tag);
 428	mutex_lock(&binder_main_lock);
 429	trace_binder_locked(tag);
 430}
 431
 432static inline void binder_unlock(const char *tag)
 433{
 434	trace_binder_unlock(tag);
 435	mutex_unlock(&binder_main_lock);
 436}
 437
 438static void binder_set_nice(long nice)
 439{
 440	long min_nice;
 441
 442	if (can_nice(current, nice)) {
 443		set_user_nice(current, nice);
 444		return;
 445	}
 446	min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
 447	binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 448		     "%d: nice value %ld not allowed use %ld instead\n",
 449		      current->pid, nice, min_nice);
 450	set_user_nice(current, min_nice);
 451	if (min_nice <= MAX_NICE)
 452		return;
 453	binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
 454}
 455
 456static size_t binder_buffer_size(struct binder_proc *proc,
 457				 struct binder_buffer *buffer)
 458{
 459	if (list_is_last(&buffer->entry, &proc->buffers))
 460		return proc->buffer + proc->buffer_size - (void *)buffer->data;
 461	return (size_t)list_entry(buffer->entry.next,
 462			  struct binder_buffer, entry) - (size_t)buffer->data;
 463}
 464
 465static void binder_insert_free_buffer(struct binder_proc *proc,
 466				      struct binder_buffer *new_buffer)
 467{
 468	struct rb_node **p = &proc->free_buffers.rb_node;
 469	struct rb_node *parent = NULL;
 470	struct binder_buffer *buffer;
 471	size_t buffer_size;
 472	size_t new_buffer_size;
 473
 474	BUG_ON(!new_buffer->free);
 475
 476	new_buffer_size = binder_buffer_size(proc, new_buffer);
 477
 478	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 479		     "%d: add free buffer, size %zd, at %p\n",
 480		      proc->pid, new_buffer_size, new_buffer);
 481
 482	while (*p) {
 483		parent = *p;
 484		buffer = rb_entry(parent, struct binder_buffer, rb_node);
 485		BUG_ON(!buffer->free);
 486
 487		buffer_size = binder_buffer_size(proc, buffer);
 488
 489		if (new_buffer_size < buffer_size)
 490			p = &parent->rb_left;
 491		else
 492			p = &parent->rb_right;
 493	}
 494	rb_link_node(&new_buffer->rb_node, parent, p);
 495	rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 496}
 497
 498static void binder_insert_allocated_buffer(struct binder_proc *proc,
 499					   struct binder_buffer *new_buffer)
 500{
 501	struct rb_node **p = &proc->allocated_buffers.rb_node;
 502	struct rb_node *parent = NULL;
 503	struct binder_buffer *buffer;
 504
 505	BUG_ON(new_buffer->free);
 506
 507	while (*p) {
 508		parent = *p;
 509		buffer = rb_entry(parent, struct binder_buffer, rb_node);
 510		BUG_ON(buffer->free);
 511
 512		if (new_buffer < buffer)
 513			p = &parent->rb_left;
 514		else if (new_buffer > buffer)
 515			p = &parent->rb_right;
 516		else
 517			BUG();
 518	}
 519	rb_link_node(&new_buffer->rb_node, parent, p);
 520	rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 521}
 522
 523static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 524						  uintptr_t user_ptr)
 525{
 526	struct rb_node *n = proc->allocated_buffers.rb_node;
 527	struct binder_buffer *buffer;
 528	struct binder_buffer *kern_ptr;
 529
 530	kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
 531		- offsetof(struct binder_buffer, data));
 532
 533	while (n) {
 534		buffer = rb_entry(n, struct binder_buffer, rb_node);
 535		BUG_ON(buffer->free);
 536
 537		if (kern_ptr < buffer)
 538			n = n->rb_left;
 539		else if (kern_ptr > buffer)
 540			n = n->rb_right;
 541		else
 542			return buffer;
 543	}
 544	return NULL;
 545}
 546
 547static int binder_update_page_range(struct binder_proc *proc, int allocate,
 548				    void *start, void *end,
 549				    struct vm_area_struct *vma)
 550{
 551	void *page_addr;
 552	unsigned long user_page_addr;
 553	struct page **page;
 554	struct mm_struct *mm;
 555
 556	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 557		     "%d: %s pages %p-%p\n", proc->pid,
 558		     allocate ? "allocate" : "free", start, end);
 559
 560	if (end <= start)
 561		return 0;
 562
 563	trace_binder_update_page_range(proc, allocate, start, end);
 564
 565	if (vma)
 566		mm = NULL;
 567	else
 568		mm = get_task_mm(proc->tsk);
 569
 570	if (mm) {
 571		down_write(&mm->mmap_sem);
 572		vma = proc->vma;
 573		if (vma && mm != proc->vma_vm_mm) {
 574			pr_err("%d: vma mm and task mm mismatch\n",
 575				proc->pid);
 576			vma = NULL;
 577		}
 578	}
 579
 580	if (allocate == 0)
 581		goto free_range;
 582
 583	if (vma == NULL) {
 584		pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
 585			proc->pid);
 586		goto err_no_vma;
 587	}
 588
 589	for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 590		int ret;
 591
 592		page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 593
 594		BUG_ON(*page);
 595		*page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 596		if (*page == NULL) {
 597			pr_err("%d: binder_alloc_buf failed for page at %p\n",
 598				proc->pid, page_addr);
 599			goto err_alloc_page_failed;
 600		}
 601		ret = map_kernel_range_noflush((unsigned long)page_addr,
 602					PAGE_SIZE, PAGE_KERNEL, page);
 603		flush_cache_vmap((unsigned long)page_addr,
 604				(unsigned long)page_addr + PAGE_SIZE);
 605		if (ret != 1) {
 606			pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
 607			       proc->pid, page_addr);
 608			goto err_map_kernel_failed;
 609		}
 610		user_page_addr =
 611			(uintptr_t)page_addr + proc->user_buffer_offset;
 612		ret = vm_insert_page(vma, user_page_addr, page[0]);
 613		if (ret) {
 614			pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
 615			       proc->pid, user_page_addr);
 616			goto err_vm_insert_page_failed;
 617		}
 618		/* vm_insert_page does not seem to increment the refcount */
 619	}
 620	if (mm) {
 621		up_write(&mm->mmap_sem);
 622		mmput(mm);
 623	}
 624	return 0;
 625
 626free_range:
 627	for (page_addr = end - PAGE_SIZE; page_addr >= start;
 628	     page_addr -= PAGE_SIZE) {
 629		page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 630		if (vma)
 631			zap_page_range(vma, (uintptr_t)page_addr +
 632				proc->user_buffer_offset, PAGE_SIZE, NULL);
 633err_vm_insert_page_failed:
 634		unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 635err_map_kernel_failed:
 636		__free_page(*page);
 637		*page = NULL;
 638err_alloc_page_failed:
 639		;
 640	}
 641err_no_vma:
 642	if (mm) {
 643		up_write(&mm->mmap_sem);
 644		mmput(mm);
 645	}
 646	return -ENOMEM;
 647}
 648
 649static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 650					      size_t data_size,
 651					      size_t offsets_size, int is_async)
 652{
 653	struct rb_node *n = proc->free_buffers.rb_node;
 654	struct binder_buffer *buffer;
 655	size_t buffer_size;
 656	struct rb_node *best_fit = NULL;
 657	void *has_page_addr;
 658	void *end_page_addr;
 659	size_t size;
 660
 661	if (proc->vma == NULL) {
 662		pr_err("%d: binder_alloc_buf, no vma\n",
 663		       proc->pid);
 664		return NULL;
 665	}
 666
 667	size = ALIGN(data_size, sizeof(void *)) +
 668		ALIGN(offsets_size, sizeof(void *));
 669
 670	if (size < data_size || size < offsets_size) {
 671		binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
 672				proc->pid, data_size, offsets_size);
 673		return NULL;
 674	}
 675
 676	if (is_async &&
 677	    proc->free_async_space < size + sizeof(struct binder_buffer)) {
 678		binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 679			     "%d: binder_alloc_buf size %zd failed, no async space left\n",
 680			      proc->pid, size);
 681		return NULL;
 682	}
 683
 684	while (n) {
 685		buffer = rb_entry(n, struct binder_buffer, rb_node);
 686		BUG_ON(!buffer->free);
 687		buffer_size = binder_buffer_size(proc, buffer);
 688
 689		if (size < buffer_size) {
 690			best_fit = n;
 691			n = n->rb_left;
 692		} else if (size > buffer_size)
 693			n = n->rb_right;
 694		else {
 695			best_fit = n;
 696			break;
 697		}
 698	}
 699	if (best_fit == NULL) {
 700		pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
 701			proc->pid, size);
 702		return NULL;
 703	}
 704	if (n == NULL) {
 705		buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 706		buffer_size = binder_buffer_size(proc, buffer);
 707	}
 708
 709	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 710		     "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
 711		      proc->pid, size, buffer, buffer_size);
 712
 713	has_page_addr =
 714		(void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 715	if (n == NULL) {
 716		if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 717			buffer_size = size; /* no room for other buffers */
 718		else
 719			buffer_size = size + sizeof(struct binder_buffer);
 720	}
 721	end_page_addr =
 722		(void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 723	if (end_page_addr > has_page_addr)
 724		end_page_addr = has_page_addr;
 725	if (binder_update_page_range(proc, 1,
 726	    (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 727		return NULL;
 728
 729	rb_erase(best_fit, &proc->free_buffers);
 730	buffer->free = 0;
 731	binder_insert_allocated_buffer(proc, buffer);
 732	if (buffer_size != size) {
 733		struct binder_buffer *new_buffer = (void *)buffer->data + size;
 734
 735		list_add(&new_buffer->entry, &buffer->entry);
 736		new_buffer->free = 1;
 737		binder_insert_free_buffer(proc, new_buffer);
 738	}
 739	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 740		     "%d: binder_alloc_buf size %zd got %p\n",
 741		      proc->pid, size, buffer);
 742	buffer->data_size = data_size;
 743	buffer->offsets_size = offsets_size;
 744	buffer->async_transaction = is_async;
 745	if (is_async) {
 746		proc->free_async_space -= size + sizeof(struct binder_buffer);
 747		binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 748			     "%d: binder_alloc_buf size %zd async free %zd\n",
 749			      proc->pid, size, proc->free_async_space);
 750	}
 751
 752	return buffer;
 753}
 754
 755static void *buffer_start_page(struct binder_buffer *buffer)
 756{
 757	return (void *)((uintptr_t)buffer & PAGE_MASK);
 758}
 759
 760static void *buffer_end_page(struct binder_buffer *buffer)
 761{
 762	return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 763}
 764
 765static void binder_delete_free_buffer(struct binder_proc *proc,
 766				      struct binder_buffer *buffer)
 767{
 768	struct binder_buffer *prev, *next = NULL;
 769	int free_page_end = 1;
 770	int free_page_start = 1;
 771
 772	BUG_ON(proc->buffers.next == &buffer->entry);
 773	prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 774	BUG_ON(!prev->free);
 775	if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 776		free_page_start = 0;
 777		if (buffer_end_page(prev) == buffer_end_page(buffer))
 778			free_page_end = 0;
 779		binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 780			     "%d: merge free, buffer %p share page with %p\n",
 781			      proc->pid, buffer, prev);
 782	}
 783
 784	if (!list_is_last(&buffer->entry, &proc->buffers)) {
 785		next = list_entry(buffer->entry.next,
 786				  struct binder_buffer, entry);
 787		if (buffer_start_page(next) == buffer_end_page(buffer)) {
 788			free_page_end = 0;
 789			if (buffer_start_page(next) ==
 790			    buffer_start_page(buffer))
 791				free_page_start = 0;
 792			binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 793				     "%d: merge free, buffer %p share page with %p\n",
 794				      proc->pid, buffer, prev);
 795		}
 796	}
 797	list_del(&buffer->entry);
 798	if (free_page_start || free_page_end) {
 799		binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 800			     "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
 801			     proc->pid, buffer, free_page_start ? "" : " end",
 802			     free_page_end ? "" : " start", prev, next);
 803		binder_update_page_range(proc, 0, free_page_start ?
 804			buffer_start_page(buffer) : buffer_end_page(buffer),
 805			(free_page_end ? buffer_end_page(buffer) :
 806			buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 807	}
 808}
 809
 810static void binder_free_buf(struct binder_proc *proc,
 811			    struct binder_buffer *buffer)
 812{
 813	size_t size, buffer_size;
 814
 815	buffer_size = binder_buffer_size(proc, buffer);
 816
 817	size = ALIGN(buffer->data_size, sizeof(void *)) +
 818		ALIGN(buffer->offsets_size, sizeof(void *));
 819
 820	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 821		     "%d: binder_free_buf %p size %zd buffer_size %zd\n",
 822		      proc->pid, buffer, size, buffer_size);
 823
 824	BUG_ON(buffer->free);
 825	BUG_ON(size > buffer_size);
 826	BUG_ON(buffer->transaction != NULL);
 827	BUG_ON((void *)buffer < proc->buffer);
 828	BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 829
 830	if (buffer->async_transaction) {
 831		proc->free_async_space += size + sizeof(struct binder_buffer);
 832
 833		binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 834			     "%d: binder_free_buf size %zd async free %zd\n",
 835			      proc->pid, size, proc->free_async_space);
 836	}
 837
 838	binder_update_page_range(proc, 0,
 839		(void *)PAGE_ALIGN((uintptr_t)buffer->data),
 840		(void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 841		NULL);
 842	rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 843	buffer->free = 1;
 844	if (!list_is_last(&buffer->entry, &proc->buffers)) {
 845		struct binder_buffer *next = list_entry(buffer->entry.next,
 846						struct binder_buffer, entry);
 847
 848		if (next->free) {
 849			rb_erase(&next->rb_node, &proc->free_buffers);
 850			binder_delete_free_buffer(proc, next);
 851		}
 852	}
 853	if (proc->buffers.next != &buffer->entry) {
 854		struct binder_buffer *prev = list_entry(buffer->entry.prev,
 855						struct binder_buffer, entry);
 856
 857		if (prev->free) {
 858			binder_delete_free_buffer(proc, buffer);
 859			rb_erase(&prev->rb_node, &proc->free_buffers);
 860			buffer = prev;
 861		}
 862	}
 863	binder_insert_free_buffer(proc, buffer);
 864}
 865
 866static struct binder_node *binder_get_node(struct binder_proc *proc,
 867					   binder_uintptr_t ptr)
 868{
 869	struct rb_node *n = proc->nodes.rb_node;
 870	struct binder_node *node;
 871
 872	while (n) {
 873		node = rb_entry(n, struct binder_node, rb_node);
 874
 875		if (ptr < node->ptr)
 876			n = n->rb_left;
 877		else if (ptr > node->ptr)
 878			n = n->rb_right;
 879		else
 880			return node;
 881	}
 882	return NULL;
 883}
 884
 885static struct binder_node *binder_new_node(struct binder_proc *proc,
 886					   binder_uintptr_t ptr,
 887					   binder_uintptr_t cookie)
 888{
 889	struct rb_node **p = &proc->nodes.rb_node;
 890	struct rb_node *parent = NULL;
 891	struct binder_node *node;
 892
 893	while (*p) {
 894		parent = *p;
 895		node = rb_entry(parent, struct binder_node, rb_node);
 896
 897		if (ptr < node->ptr)
 898			p = &(*p)->rb_left;
 899		else if (ptr > node->ptr)
 900			p = &(*p)->rb_right;
 901		else
 902			return NULL;
 903	}
 904
 905	node = kzalloc(sizeof(*node), GFP_KERNEL);
 906	if (node == NULL)
 907		return NULL;
 908	binder_stats_created(BINDER_STAT_NODE);
 909	rb_link_node(&node->rb_node, parent, p);
 910	rb_insert_color(&node->rb_node, &proc->nodes);
 911	node->debug_id = ++binder_last_id;
 912	node->proc = proc;
 913	node->ptr = ptr;
 914	node->cookie = cookie;
 915	node->work.type = BINDER_WORK_NODE;
 916	INIT_LIST_HEAD(&node->work.entry);
 917	INIT_LIST_HEAD(&node->async_todo);
 918	binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 919		     "%d:%d node %d u%016llx c%016llx created\n",
 920		     proc->pid, current->pid, node->debug_id,
 921		     (u64)node->ptr, (u64)node->cookie);
 922	return node;
 923}
 924
 925static int binder_inc_node(struct binder_node *node, int strong, int internal,
 926			   struct list_head *target_list)
 927{
 928	if (strong) {
 929		if (internal) {
 930			if (target_list == NULL &&
 931			    node->internal_strong_refs == 0 &&
 932			    !(node == binder_context_mgr_node &&
 933			    node->has_strong_ref)) {
 934				pr_err("invalid inc strong node for %d\n",
 935					node->debug_id);
 936				return -EINVAL;
 937			}
 938			node->internal_strong_refs++;
 939		} else
 940			node->local_strong_refs++;
 941		if (!node->has_strong_ref && target_list) {
 942			list_del_init(&node->work.entry);
 943			list_add_tail(&node->work.entry, target_list);
 944		}
 945	} else {
 946		if (!internal)
 947			node->local_weak_refs++;
 948		if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 949			if (target_list == NULL) {
 950				pr_err("invalid inc weak node for %d\n",
 951					node->debug_id);
 952				return -EINVAL;
 953			}
 954			list_add_tail(&node->work.entry, target_list);
 955		}
 956	}
 957	return 0;
 958}
 959
 960static int binder_dec_node(struct binder_node *node, int strong, int internal)
 961{
 962	if (strong) {
 963		if (internal)
 964			node->internal_strong_refs--;
 965		else
 966			node->local_strong_refs--;
 967		if (node->local_strong_refs || node->internal_strong_refs)
 968			return 0;
 969	} else {
 970		if (!internal)
 971			node->local_weak_refs--;
 972		if (node->local_weak_refs || !hlist_empty(&node->refs))
 973			return 0;
 974	}
 975	if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
 976		if (list_empty(&node->work.entry)) {
 977			list_add_tail(&node->work.entry, &node->proc->todo);
 978			wake_up_interruptible(&node->proc->wait);
 979		}
 980	} else {
 981		if (hlist_empty(&node->refs) && !node->local_strong_refs &&
 982		    !node->local_weak_refs) {
 983			list_del_init(&node->work.entry);
 984			if (node->proc) {
 985				rb_erase(&node->rb_node, &node->proc->nodes);
 986				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 987					     "refless node %d deleted\n",
 988					     node->debug_id);
 989			} else {
 990				hlist_del(&node->dead_node);
 991				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 992					     "dead node %d deleted\n",
 993					     node->debug_id);
 994			}
 995			kfree(node);
 996			binder_stats_deleted(BINDER_STAT_NODE);
 997		}
 998	}
 999
1000	return 0;
1001}
1002
1003
1004static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1005					 u32 desc, bool need_strong_ref)
1006{
1007	struct rb_node *n = proc->refs_by_desc.rb_node;
1008	struct binder_ref *ref;
1009
1010	while (n) {
1011		ref = rb_entry(n, struct binder_ref, rb_node_desc);
1012
1013		if (desc < ref->desc) {
1014			n = n->rb_left;
1015		} else if (desc > ref->desc) {
1016			n = n->rb_right;
1017		} else if (need_strong_ref && !ref->strong) {
1018			binder_user_error("tried to use weak ref as strong ref\n");
1019			return NULL;
1020		} else {
1021			return ref;
1022		}
1023	}
1024	return NULL;
1025}
1026
1027static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1028						  struct binder_node *node)
1029{
1030	struct rb_node *n;
1031	struct rb_node **p = &proc->refs_by_node.rb_node;
1032	struct rb_node *parent = NULL;
1033	struct binder_ref *ref, *new_ref;
1034
1035	while (*p) {
1036		parent = *p;
1037		ref = rb_entry(parent, struct binder_ref, rb_node_node);
1038
1039		if (node < ref->node)
1040			p = &(*p)->rb_left;
1041		else if (node > ref->node)
1042			p = &(*p)->rb_right;
1043		else
1044			return ref;
1045	}
1046	new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1047	if (new_ref == NULL)
1048		return NULL;
1049	binder_stats_created(BINDER_STAT_REF);
1050	new_ref->debug_id = ++binder_last_id;
1051	new_ref->proc = proc;
1052	new_ref->node = node;
1053	rb_link_node(&new_ref->rb_node_node, parent, p);
1054	rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1055
1056	new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1057	for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1058		ref = rb_entry(n, struct binder_ref, rb_node_desc);
1059		if (ref->desc > new_ref->desc)
1060			break;
1061		new_ref->desc = ref->desc + 1;
1062	}
1063
1064	p = &proc->refs_by_desc.rb_node;
1065	while (*p) {
1066		parent = *p;
1067		ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1068
1069		if (new_ref->desc < ref->desc)
1070			p = &(*p)->rb_left;
1071		else if (new_ref->desc > ref->desc)
1072			p = &(*p)->rb_right;
1073		else
1074			BUG();
1075	}
1076	rb_link_node(&new_ref->rb_node_desc, parent, p);
1077	rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1078	if (node) {
1079		hlist_add_head(&new_ref->node_entry, &node->refs);
1080
1081		binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1082			     "%d new ref %d desc %d for node %d\n",
1083			      proc->pid, new_ref->debug_id, new_ref->desc,
1084			      node->debug_id);
1085	} else {
1086		binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1087			     "%d new ref %d desc %d for dead node\n",
1088			      proc->pid, new_ref->debug_id, new_ref->desc);
1089	}
1090	return new_ref;
1091}
1092
1093static void binder_delete_ref(struct binder_ref *ref)
1094{
1095	binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1096		     "%d delete ref %d desc %d for node %d\n",
1097		      ref->proc->pid, ref->debug_id, ref->desc,
1098		      ref->node->debug_id);
1099
1100	rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1101	rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1102	if (ref->strong)
1103		binder_dec_node(ref->node, 1, 1);
1104	hlist_del(&ref->node_entry);
1105	binder_dec_node(ref->node, 0, 1);
1106	if (ref->death) {
1107		binder_debug(BINDER_DEBUG_DEAD_BINDER,
1108			     "%d delete ref %d desc %d has death notification\n",
1109			      ref->proc->pid, ref->debug_id, ref->desc);
1110		list_del(&ref->death->work.entry);
1111		kfree(ref->death);
1112		binder_stats_deleted(BINDER_STAT_DEATH);
1113	}
1114	kfree(ref);
1115	binder_stats_deleted(BINDER_STAT_REF);
1116}
1117
1118static int binder_inc_ref(struct binder_ref *ref, int strong,
1119			  struct list_head *target_list)
1120{
1121	int ret;
1122
1123	if (strong) {
1124		if (ref->strong == 0) {
1125			ret = binder_inc_node(ref->node, 1, 1, target_list);
1126			if (ret)
1127				return ret;
1128		}
1129		ref->strong++;
1130	} else {
1131		if (ref->weak == 0) {
1132			ret = binder_inc_node(ref->node, 0, 1, target_list);
1133			if (ret)
1134				return ret;
1135		}
1136		ref->weak++;
1137	}
1138	return 0;
1139}
1140
1141
1142static int binder_dec_ref(struct binder_ref *ref, int strong)
1143{
1144	if (strong) {
1145		if (ref->strong == 0) {
1146			binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1147					  ref->proc->pid, ref->debug_id,
1148					  ref->desc, ref->strong, ref->weak);
1149			return -EINVAL;
1150		}
1151		ref->strong--;
1152		if (ref->strong == 0) {
1153			int ret;
1154
1155			ret = binder_dec_node(ref->node, strong, 1);
1156			if (ret)
1157				return ret;
1158		}
1159	} else {
1160		if (ref->weak == 0) {
1161			binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1162					  ref->proc->pid, ref->debug_id,
1163					  ref->desc, ref->strong, ref->weak);
1164			return -EINVAL;
1165		}
1166		ref->weak--;
1167	}
1168	if (ref->strong == 0 && ref->weak == 0)
1169		binder_delete_ref(ref);
1170	return 0;
1171}
1172
1173static void binder_pop_transaction(struct binder_thread *target_thread,
1174				   struct binder_transaction *t)
1175{
1176	if (target_thread) {
1177		BUG_ON(target_thread->transaction_stack != t);
1178		BUG_ON(target_thread->transaction_stack->from != target_thread);
1179		target_thread->transaction_stack =
1180			target_thread->transaction_stack->from_parent;
1181		t->from = NULL;
1182	}
1183	t->need_reply = 0;
1184	if (t->buffer)
1185		t->buffer->transaction = NULL;
1186	kfree(t);
1187	binder_stats_deleted(BINDER_STAT_TRANSACTION);
1188}
1189
1190static void binder_send_failed_reply(struct binder_transaction *t,
1191				     uint32_t error_code)
1192{
1193	struct binder_thread *target_thread;
1194	struct binder_transaction *next;
1195
1196	BUG_ON(t->flags & TF_ONE_WAY);
1197	while (1) {
1198		target_thread = t->from;
1199		if (target_thread) {
1200			if (target_thread->return_error != BR_OK &&
1201			   target_thread->return_error2 == BR_OK) {
1202				target_thread->return_error2 =
1203					target_thread->return_error;
1204				target_thread->return_error = BR_OK;
1205			}
1206			if (target_thread->return_error == BR_OK) {
1207				binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1208					     "send failed reply for transaction %d to %d:%d\n",
1209					      t->debug_id,
1210					      target_thread->proc->pid,
1211					      target_thread->pid);
1212
1213				binder_pop_transaction(target_thread, t);
1214				target_thread->return_error = error_code;
1215				wake_up_interruptible(&target_thread->wait);
1216			} else {
1217				pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1218					target_thread->proc->pid,
1219					target_thread->pid,
1220					target_thread->return_error);
1221			}
1222			return;
1223		}
1224		next = t->from_parent;
1225
1226		binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1227			     "send failed reply for transaction %d, target dead\n",
1228			     t->debug_id);
1229
1230		binder_pop_transaction(target_thread, t);
1231		if (next == NULL) {
1232			binder_debug(BINDER_DEBUG_DEAD_BINDER,
1233				     "reply failed, no target thread at root\n");
1234			return;
1235		}
1236		t = next;
1237		binder_debug(BINDER_DEBUG_DEAD_BINDER,
1238			     "reply failed, no target thread -- retry %d\n",
1239			      t->debug_id);
1240	}
1241}
1242
1243static void binder_transaction_buffer_release(struct binder_proc *proc,
1244					      struct binder_buffer *buffer,
1245					      binder_size_t *failed_at)
1246{
1247	binder_size_t *offp, *off_end;
1248	int debug_id = buffer->debug_id;
1249
1250	binder_debug(BINDER_DEBUG_TRANSACTION,
1251		     "%d buffer release %d, size %zd-%zd, failed at %p\n",
1252		     proc->pid, buffer->debug_id,
1253		     buffer->data_size, buffer->offsets_size, failed_at);
1254
1255	if (buffer->target_node)
1256		binder_dec_node(buffer->target_node, 1, 0);
1257
1258	offp = (binder_size_t *)(buffer->data +
1259				 ALIGN(buffer->data_size, sizeof(void *)));
1260	if (failed_at)
1261		off_end = failed_at;
1262	else
1263		off_end = (void *)offp + buffer->offsets_size;
1264	for (; offp < off_end; offp++) {
1265		struct flat_binder_object *fp;
1266
1267		if (*offp > buffer->data_size - sizeof(*fp) ||
1268		    buffer->data_size < sizeof(*fp) ||
1269		    !IS_ALIGNED(*offp, sizeof(u32))) {
1270			pr_err("transaction release %d bad offset %lld, size %zd\n",
1271			       debug_id, (u64)*offp, buffer->data_size);
1272			continue;
1273		}
1274		fp = (struct flat_binder_object *)(buffer->data + *offp);
1275		switch (fp->type) {
1276		case BINDER_TYPE_BINDER:
1277		case BINDER_TYPE_WEAK_BINDER: {
1278			struct binder_node *node = binder_get_node(proc, fp->binder);
1279
1280			if (node == NULL) {
1281				pr_err("transaction release %d bad node %016llx\n",
1282				       debug_id, (u64)fp->binder);
1283				break;
1284			}
1285			binder_debug(BINDER_DEBUG_TRANSACTION,
1286				     "        node %d u%016llx\n",
1287				     node->debug_id, (u64)node->ptr);
1288			binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1289		} break;
1290		case BINDER_TYPE_HANDLE:
1291		case BINDER_TYPE_WEAK_HANDLE: {
1292			struct binder_ref *ref;
1293
1294			ref = binder_get_ref(proc, fp->handle,
1295					     fp->type == BINDER_TYPE_HANDLE);
1296
1297			if (ref == NULL) {
1298				pr_err("transaction release %d bad handle %d\n",
1299				 debug_id, fp->handle);
1300				break;
1301			}
1302			binder_debug(BINDER_DEBUG_TRANSACTION,
1303				     "        ref %d desc %d (node %d)\n",
1304				     ref->debug_id, ref->desc, ref->node->debug_id);
1305			binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1306		} break;
1307
1308		case BINDER_TYPE_FD:
1309			binder_debug(BINDER_DEBUG_TRANSACTION,
1310				     "        fd %d\n", fp->handle);
1311			if (failed_at)
1312				task_close_fd(proc, fp->handle);
1313			break;
1314
1315		default:
1316			pr_err("transaction release %d bad object type %x\n",
1317				debug_id, fp->type);
1318			break;
1319		}
1320	}
1321}
1322
1323static void binder_transaction(struct binder_proc *proc,
1324			       struct binder_thread *thread,
1325			       struct binder_transaction_data *tr, int reply)
1326{
1327	struct binder_transaction *t;
1328	struct binder_work *tcomplete;
1329	binder_size_t *offp, *off_end;
1330	binder_size_t off_min;
1331	struct binder_proc *target_proc;
1332	struct binder_thread *target_thread = NULL;
1333	struct binder_node *target_node = NULL;
1334	struct list_head *target_list;
1335	wait_queue_head_t *target_wait;
1336	struct binder_transaction *in_reply_to = NULL;
1337	struct binder_transaction_log_entry *e;
1338	uint32_t return_error;
1339
1340	e = binder_transaction_log_add(&binder_transaction_log);
1341	e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1342	e->from_proc = proc->pid;
1343	e->from_thread = thread->pid;
1344	e->target_handle = tr->target.handle;
1345	e->data_size = tr->data_size;
1346	e->offsets_size = tr->offsets_size;
1347
1348	if (reply) {
1349		in_reply_to = thread->transaction_stack;
1350		if (in_reply_to == NULL) {
1351			binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1352					  proc->pid, thread->pid);
1353			return_error = BR_FAILED_REPLY;
1354			goto err_empty_call_stack;
1355		}
1356		binder_set_nice(in_reply_to->saved_priority);
1357		if (in_reply_to->to_thread != thread) {
1358			binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1359				proc->pid, thread->pid, in_reply_to->debug_id,
1360				in_reply_to->to_proc ?
1361				in_reply_to->to_proc->pid : 0,
1362				in_reply_to->to_thread ?
1363				in_reply_to->to_thread->pid : 0);
1364			return_error = BR_FAILED_REPLY;
1365			in_reply_to = NULL;
1366			goto err_bad_call_stack;
1367		}
1368		thread->transaction_stack = in_reply_to->to_parent;
1369		target_thread = in_reply_to->from;
1370		if (target_thread == NULL) {
1371			return_error = BR_DEAD_REPLY;
1372			goto err_dead_binder;
1373		}
1374		if (target_thread->transaction_stack != in_reply_to) {
1375			binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1376				proc->pid, thread->pid,
1377				target_thread->transaction_stack ?
1378				target_thread->transaction_stack->debug_id : 0,
1379				in_reply_to->debug_id);
1380			return_error = BR_FAILED_REPLY;
1381			in_reply_to = NULL;
1382			target_thread = NULL;
1383			goto err_dead_binder;
1384		}
1385		target_proc = target_thread->proc;
1386	} else {
1387		if (tr->target.handle) {
1388			struct binder_ref *ref;
1389
1390			ref = binder_get_ref(proc, tr->target.handle, true);
1391			if (ref == NULL) {
1392				binder_user_error("%d:%d got transaction to invalid handle\n",
1393					proc->pid, thread->pid);
1394				return_error = BR_FAILED_REPLY;
1395				goto err_invalid_target_handle;
1396			}
1397			target_node = ref->node;
1398		} else {
1399			target_node = binder_context_mgr_node;
1400			if (target_node == NULL) {
1401				return_error = BR_DEAD_REPLY;
1402				goto err_no_context_mgr_node;
1403			}
1404		}
1405		e->to_node = target_node->debug_id;
1406		target_proc = target_node->proc;
1407		if (target_proc == NULL) {
1408			return_error = BR_DEAD_REPLY;
1409			goto err_dead_binder;
1410		}
1411		if (security_binder_transaction(proc->tsk,
1412						target_proc->tsk) < 0) {
1413			return_error = BR_FAILED_REPLY;
1414			goto err_invalid_target_handle;
1415		}
1416		if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1417			struct binder_transaction *tmp;
1418
1419			tmp = thread->transaction_stack;
1420			if (tmp->to_thread != thread) {
1421				binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1422					proc->pid, thread->pid, tmp->debug_id,
1423					tmp->to_proc ? tmp->to_proc->pid : 0,
1424					tmp->to_thread ?
1425					tmp->to_thread->pid : 0);
1426				return_error = BR_FAILED_REPLY;
1427				goto err_bad_call_stack;
1428			}
1429			while (tmp) {
1430				if (tmp->from && tmp->from->proc == target_proc)
1431					target_thread = tmp->from;
1432				tmp = tmp->from_parent;
1433			}
1434		}
1435	}
1436	if (target_thread) {
1437		e->to_thread = target_thread->pid;
1438		target_list = &target_thread->todo;
1439		target_wait = &target_thread->wait;
1440	} else {
1441		target_list = &target_proc->todo;
1442		target_wait = &target_proc->wait;
1443	}
1444	e->to_proc = target_proc->pid;
1445
1446	/* TODO: reuse incoming transaction for reply */
1447	t = kzalloc(sizeof(*t), GFP_KERNEL);
1448	if (t == NULL) {
1449		return_error = BR_FAILED_REPLY;
1450		goto err_alloc_t_failed;
1451	}
1452	binder_stats_created(BINDER_STAT_TRANSACTION);
1453
1454	tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1455	if (tcomplete == NULL) {
1456		return_error = BR_FAILED_REPLY;
1457		goto err_alloc_tcomplete_failed;
1458	}
1459	binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1460
1461	t->debug_id = ++binder_last_id;
1462	e->debug_id = t->debug_id;
1463
1464	if (reply)
1465		binder_debug(BINDER_DEBUG_TRANSACTION,
1466			     "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld\n",
1467			     proc->pid, thread->pid, t->debug_id,
1468			     target_proc->pid, target_thread->pid,
1469			     (u64)tr->data.ptr.buffer,
1470			     (u64)tr->data.ptr.offsets,
1471			     (u64)tr->data_size, (u64)tr->offsets_size);
1472	else
1473		binder_debug(BINDER_DEBUG_TRANSACTION,
1474			     "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld\n",
1475			     proc->pid, thread->pid, t->debug_id,
1476			     target_proc->pid, target_node->debug_id,
1477			     (u64)tr->data.ptr.buffer,
1478			     (u64)tr->data.ptr.offsets,
1479			     (u64)tr->data_size, (u64)tr->offsets_size);
1480
1481	if (!reply && !(tr->flags & TF_ONE_WAY))
1482		t->from = thread;
1483	else
1484		t->from = NULL;
1485	t->sender_euid = task_euid(proc->tsk);
1486	t->to_proc = target_proc;
1487	t->to_thread = target_thread;
1488	t->code = tr->code;
1489	t->flags = tr->flags;
1490	t->priority = task_nice(current);
1491
1492	trace_binder_transaction(reply, t, target_node);
1493
1494	t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1495		tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1496	if (t->buffer == NULL) {
1497		return_error = BR_FAILED_REPLY;
1498		goto err_binder_alloc_buf_failed;
1499	}
1500	t->buffer->allow_user_free = 0;
1501	t->buffer->debug_id = t->debug_id;
1502	t->buffer->transaction = t;
1503	t->buffer->target_node = target_node;
1504	trace_binder_transaction_alloc_buf(t->buffer);
1505	if (target_node)
1506		binder_inc_node(target_node, 1, 0, NULL);
1507
1508	offp = (binder_size_t *)(t->buffer->data +
1509				 ALIGN(tr->data_size, sizeof(void *)));
1510
1511	if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
1512			   tr->data.ptr.buffer, tr->data_size)) {
1513		binder_user_error("%d:%d got transaction with invalid data ptr\n",
1514				proc->pid, thread->pid);
1515		return_error = BR_FAILED_REPLY;
1516		goto err_copy_data_failed;
1517	}
1518	if (copy_from_user(offp, (const void __user *)(uintptr_t)
1519			   tr->data.ptr.offsets, tr->offsets_size)) {
1520		binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1521				proc->pid, thread->pid);
1522		return_error = BR_FAILED_REPLY;
1523		goto err_copy_data_failed;
1524	}
1525	if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
1526		binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
1527				proc->pid, thread->pid, (u64)tr->offsets_size);
1528		return_error = BR_FAILED_REPLY;
1529		goto err_bad_offset;
1530	}
1531	off_end = (void *)offp + tr->offsets_size;
1532	off_min = 0;
1533	for (; offp < off_end; offp++) {
1534		struct flat_binder_object *fp;
1535
1536		if (*offp > t->buffer->data_size - sizeof(*fp) ||
1537		    *offp < off_min ||
1538		    t->buffer->data_size < sizeof(*fp) ||
1539		    !IS_ALIGNED(*offp, sizeof(u32))) {
1540			binder_user_error("%d:%d got transaction with invalid offset, %lld (min %lld, max %lld)\n",
1541					  proc->pid, thread->pid, (u64)*offp,
1542					  (u64)off_min,
1543					  (u64)(t->buffer->data_size -
1544					  sizeof(*fp)));
1545			return_error = BR_FAILED_REPLY;
1546			goto err_bad_offset;
1547		}
1548		fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1549		off_min = *offp + sizeof(struct flat_binder_object);
1550		switch (fp->type) {
1551		case BINDER_TYPE_BINDER:
1552		case BINDER_TYPE_WEAK_BINDER: {
1553			struct binder_ref *ref;
1554			struct binder_node *node = binder_get_node(proc, fp->binder);
1555
1556			if (node == NULL) {
1557				node = binder_new_node(proc, fp->binder, fp->cookie);
1558				if (node == NULL) {
1559					return_error = BR_FAILED_REPLY;
1560					goto err_binder_new_node_failed;
1561				}
1562				node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1563				node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1564			}
1565			if (fp->cookie != node->cookie) {
1566				binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1567					proc->pid, thread->pid,
1568					(u64)fp->binder, node->debug_id,
1569					(u64)fp->cookie, (u64)node->cookie);
1570				return_error = BR_FAILED_REPLY;
1571				goto err_binder_get_ref_for_node_failed;
1572			}
1573			if (security_binder_transfer_binder(proc->tsk,
1574							    target_proc->tsk)) {
1575				return_error = BR_FAILED_REPLY;
1576				goto err_binder_get_ref_for_node_failed;
1577			}
1578			ref = binder_get_ref_for_node(target_proc, node);
1579			if (ref == NULL) {
1580				return_error = BR_FAILED_REPLY;
1581				goto err_binder_get_ref_for_node_failed;
1582			}
1583			if (fp->type == BINDER_TYPE_BINDER)
1584				fp->type = BINDER_TYPE_HANDLE;
1585			else
1586				fp->type = BINDER_TYPE_WEAK_HANDLE;
1587			fp->binder = 0;
1588			fp->handle = ref->desc;
1589			fp->cookie = 0;
1590			binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1591				       &thread->todo);
1592
1593			trace_binder_transaction_node_to_ref(t, node, ref);
1594			binder_debug(BINDER_DEBUG_TRANSACTION,
1595				     "        node %d u%016llx -> ref %d desc %d\n",
1596				     node->debug_id, (u64)node->ptr,
1597				     ref->debug_id, ref->desc);
1598		} break;
1599		case BINDER_TYPE_HANDLE:
1600		case BINDER_TYPE_WEAK_HANDLE: {
1601			struct binder_ref *ref;
1602
1603			ref = binder_get_ref(proc, fp->handle,
1604					     fp->type == BINDER_TYPE_HANDLE);
1605
1606			if (ref == NULL) {
1607				binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1608						proc->pid,
1609						thread->pid, fp->handle);
1610				return_error = BR_FAILED_REPLY;
1611				goto err_binder_get_ref_failed;
1612			}
1613			if (security_binder_transfer_binder(proc->tsk,
1614							    target_proc->tsk)) {
1615				return_error = BR_FAILED_REPLY;
1616				goto err_binder_get_ref_failed;
1617			}
1618			if (ref->node->proc == target_proc) {
1619				if (fp->type == BINDER_TYPE_HANDLE)
1620					fp->type = BINDER_TYPE_BINDER;
1621				else
1622					fp->type = BINDER_TYPE_WEAK_BINDER;
1623				fp->binder = ref->node->ptr;
1624				fp->cookie = ref->node->cookie;
1625				binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1626				trace_binder_transaction_ref_to_node(t, ref);
1627				binder_debug(BINDER_DEBUG_TRANSACTION,
1628					     "        ref %d desc %d -> node %d u%016llx\n",
1629					     ref->debug_id, ref->desc, ref->node->debug_id,
1630					     (u64)ref->node->ptr);
1631			} else {
1632				struct binder_ref *new_ref;
1633
1634				new_ref = binder_get_ref_for_node(target_proc, ref->node);
1635				if (new_ref == NULL) {
1636					return_error = BR_FAILED_REPLY;
1637					goto err_binder_get_ref_for_node_failed;
1638				}
1639				fp->binder = 0;
1640				fp->handle = new_ref->desc;
1641				fp->cookie = 0;
1642				binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1643				trace_binder_transaction_ref_to_ref(t, ref,
1644								    new_ref);
1645				binder_debug(BINDER_DEBUG_TRANSACTION,
1646					     "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1647					     ref->debug_id, ref->desc, new_ref->debug_id,
1648					     new_ref->desc, ref->node->debug_id);
1649			}
1650		} break;
1651
1652		case BINDER_TYPE_FD: {
1653			int target_fd;
1654			struct file *file;
1655
1656			if (reply) {
1657				if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1658					binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1659						proc->pid, thread->pid, fp->handle);
1660					return_error = BR_FAILED_REPLY;
1661					goto err_fd_not_allowed;
1662				}
1663			} else if (!target_node->accept_fds) {
1664				binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1665					proc->pid, thread->pid, fp->handle);
1666				return_error = BR_FAILED_REPLY;
1667				goto err_fd_not_allowed;
1668			}
1669
1670			file = fget(fp->handle);
1671			if (file == NULL) {
1672				binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1673					proc->pid, thread->pid, fp->handle);
1674				return_error = BR_FAILED_REPLY;
1675				goto err_fget_failed;
1676			}
1677			if (security_binder_transfer_file(proc->tsk,
1678							  target_proc->tsk,
1679							  file) < 0) {
1680				fput(file);
1681				return_error = BR_FAILED_REPLY;
1682				goto err_get_unused_fd_failed;
1683			}
1684			target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1685			if (target_fd < 0) {
1686				fput(file);
1687				return_error = BR_FAILED_REPLY;
1688				goto err_get_unused_fd_failed;
1689			}
1690			task_fd_install(target_proc, target_fd, file);
1691			trace_binder_transaction_fd(t, fp->handle, target_fd);
1692			binder_debug(BINDER_DEBUG_TRANSACTION,
1693				     "        fd %d -> %d\n", fp->handle, target_fd);
1694			/* TODO: fput? */
1695			fp->binder = 0;
1696			fp->handle = target_fd;
1697		} break;
1698
1699		default:
1700			binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1701				proc->pid, thread->pid, fp->type);
1702			return_error = BR_FAILED_REPLY;
1703			goto err_bad_object_type;
1704		}
1705	}
1706	if (reply) {
1707		BUG_ON(t->buffer->async_transaction != 0);
1708		binder_pop_transaction(target_thread, in_reply_to);
1709	} else if (!(t->flags & TF_ONE_WAY)) {
1710		BUG_ON(t->buffer->async_transaction != 0);
1711		t->need_reply = 1;
1712		t->from_parent = thread->transaction_stack;
1713		thread->transaction_stack = t;
1714	} else {
1715		BUG_ON(target_node == NULL);
1716		BUG_ON(t->buffer->async_transaction != 1);
1717		if (target_node->has_async_transaction) {
1718			target_list = &target_node->async_todo;
1719			target_wait = NULL;
1720		} else
1721			target_node->has_async_transaction = 1;
1722	}
1723	t->work.type = BINDER_WORK_TRANSACTION;
1724	list_add_tail(&t->work.entry, target_list);
1725	tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1726	list_add_tail(&tcomplete->entry, &thread->todo);
1727	if (target_wait)
1728		wake_up_interruptible(target_wait);
1729	return;
1730
1731err_get_unused_fd_failed:
1732err_fget_failed:
1733err_fd_not_allowed:
1734err_binder_get_ref_for_node_failed:
1735err_binder_get_ref_failed:
1736err_binder_new_node_failed:
1737err_bad_object_type:
1738err_bad_offset:
1739err_copy_data_failed:
1740	trace_binder_transaction_failed_buffer_release(t->buffer);
1741	binder_transaction_buffer_release(target_proc, t->buffer, offp);
1742	t->buffer->transaction = NULL;
1743	binder_free_buf(target_proc, t->buffer);
1744err_binder_alloc_buf_failed:
1745	kfree(tcomplete);
1746	binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1747err_alloc_tcomplete_failed:
1748	kfree(t);
1749	binder_stats_deleted(BINDER_STAT_TRANSACTION);
1750err_alloc_t_failed:
1751err_bad_call_stack:
1752err_empty_call_stack:
1753err_dead_binder:
1754err_invalid_target_handle:
1755err_no_context_mgr_node:
1756	binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1757		     "%d:%d transaction failed %d, size %lld-%lld\n",
1758		     proc->pid, thread->pid, return_error,
1759		     (u64)tr->data_size, (u64)tr->offsets_size);
1760
1761	{
1762		struct binder_transaction_log_entry *fe;
1763
1764		fe = binder_transaction_log_add(&binder_transaction_log_failed);
1765		*fe = *e;
1766	}
1767
1768	BUG_ON(thread->return_error != BR_OK);
1769	if (in_reply_to) {
1770		thread->return_error = BR_TRANSACTION_COMPLETE;
1771		binder_send_failed_reply(in_reply_to, return_error);
1772	} else
1773		thread->return_error = return_error;
1774}
1775
1776static int binder_thread_write(struct binder_proc *proc,
1777			struct binder_thread *thread,
1778			binder_uintptr_t binder_buffer, size_t size,
1779			binder_size_t *consumed)
1780{
1781	uint32_t cmd;
1782	void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
1783	void __user *ptr = buffer + *consumed;
1784	void __user *end = buffer + size;
1785
1786	while (ptr < end && thread->return_error == BR_OK) {
1787		if (get_user(cmd, (uint32_t __user *)ptr))
1788			return -EFAULT;
1789		ptr += sizeof(uint32_t);
1790		trace_binder_command(cmd);
1791		if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1792			binder_stats.bc[_IOC_NR(cmd)]++;
1793			proc->stats.bc[_IOC_NR(cmd)]++;
1794			thread->stats.bc[_IOC_NR(cmd)]++;
1795		}
1796		switch (cmd) {
1797		case BC_INCREFS:
1798		case BC_ACQUIRE:
1799		case BC_RELEASE:
1800		case BC_DECREFS: {
1801			uint32_t target;
1802			struct binder_ref *ref;
1803			const char *debug_string;
1804
1805			if (get_user(target, (uint32_t __user *)ptr))
1806				return -EFAULT;
1807			ptr += sizeof(uint32_t);
1808			if (target == 0 && binder_context_mgr_node &&
1809			    (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1810				ref = binder_get_ref_for_node(proc,
1811					       binder_context_mgr_node);
1812				if (ref->desc != target) {
1813					binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1814						proc->pid, thread->pid,
1815						ref->desc);
1816				}
1817			} else
1818				ref = binder_get_ref(proc, target,
1819						     cmd == BC_ACQUIRE ||
1820						     cmd == BC_RELEASE);
1821			if (ref == NULL) {
1822				binder_user_error("%d:%d refcount change on invalid ref %d\n",
1823					proc->pid, thread->pid, target);
1824				break;
1825			}
1826			switch (cmd) {
1827			case BC_INCREFS:
1828				debug_string = "IncRefs";
1829				binder_inc_ref(ref, 0, NULL);
1830				break;
1831			case BC_ACQUIRE:
1832				debug_string = "Acquire";
1833				binder_inc_ref(ref, 1, NULL);
1834				break;
1835			case BC_RELEASE:
1836				debug_string = "Release";
1837				binder_dec_ref(ref, 1);
1838				break;
1839			case BC_DECREFS:
1840			default:
1841				debug_string = "DecRefs";
1842				binder_dec_ref(ref, 0);
1843				break;
1844			}
1845			binder_debug(BINDER_DEBUG_USER_REFS,
1846				     "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1847				     proc->pid, thread->pid, debug_string, ref->debug_id,
1848				     ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1849			break;
1850		}
1851		case BC_INCREFS_DONE:
1852		case BC_ACQUIRE_DONE: {
1853			binder_uintptr_t node_ptr;
1854			binder_uintptr_t cookie;
1855			struct binder_node *node;
1856
1857			if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
1858				return -EFAULT;
1859			ptr += sizeof(binder_uintptr_t);
1860			if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1861				return -EFAULT;
1862			ptr += sizeof(binder_uintptr_t);
1863			node = binder_get_node(proc, node_ptr);
1864			if (node == NULL) {
1865				binder_user_error("%d:%d %s u%016llx no match\n",
1866					proc->pid, thread->pid,
1867					cmd == BC_INCREFS_DONE ?
1868					"BC_INCREFS_DONE" :
1869					"BC_ACQUIRE_DONE",
1870					(u64)node_ptr);
1871				break;
1872			}
1873			if (cookie != node->cookie) {
1874				binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
1875					proc->pid, thread->pid,
1876					cmd == BC_INCREFS_DONE ?
1877					"BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1878					(u64)node_ptr, node->debug_id,
1879					(u64)cookie, (u64)node->cookie);
1880				break;
1881			}
1882			if (cmd == BC_ACQUIRE_DONE) {
1883				if (node->pending_strong_ref == 0) {
1884					binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1885						proc->pid, thread->pid,
1886						node->debug_id);
1887					break;
1888				}
1889				node->pending_strong_ref = 0;
1890			} else {
1891				if (node->pending_weak_ref == 0) {
1892					binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1893						proc->pid, thread->pid,
1894						node->debug_id);
1895					break;
1896				}
1897				node->pending_weak_ref = 0;
1898			}
1899			binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1900			binder_debug(BINDER_DEBUG_USER_REFS,
1901				     "%d:%d %s node %d ls %d lw %d\n",
1902				     proc->pid, thread->pid,
1903				     cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1904				     node->debug_id, node->local_strong_refs, node->local_weak_refs);
1905			break;
1906		}
1907		case BC_ATTEMPT_ACQUIRE:
1908			pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1909			return -EINVAL;
1910		case BC_ACQUIRE_RESULT:
1911			pr_err("BC_ACQUIRE_RESULT not supported\n");
1912			return -EINVAL;
1913
1914		case BC_FREE_BUFFER: {
1915			binder_uintptr_t data_ptr;
1916			struct binder_buffer *buffer;
1917
1918			if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
1919				return -EFAULT;
1920			ptr += sizeof(binder_uintptr_t);
1921
1922			buffer = binder_buffer_lookup(proc, data_ptr);
1923			if (buffer == NULL) {
1924				binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
1925					proc->pid, thread->pid, (u64)data_ptr);
1926				break;
1927			}
1928			if (!buffer->allow_user_free) {
1929				binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
1930					proc->pid, thread->pid, (u64)data_ptr);
1931				break;
1932			}
1933			binder_debug(BINDER_DEBUG_FREE_BUFFER,
1934				     "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
1935				     proc->pid, thread->pid, (u64)data_ptr,
1936				     buffer->debug_id,
1937				     buffer->transaction ? "active" : "finished");
1938
1939			if (buffer->transaction) {
1940				buffer->transaction->buffer = NULL;
1941				buffer->transaction = NULL;
1942			}
1943			if (buffer->async_transaction && buffer->target_node) {
1944				BUG_ON(!buffer->target_node->has_async_transaction);
1945				if (list_empty(&buffer->target_node->async_todo))
1946					buffer->target_node->has_async_transaction = 0;
1947				else
1948					list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1949			}
1950			trace_binder_transaction_buffer_release(buffer);
1951			binder_transaction_buffer_release(proc, buffer, NULL);
1952			binder_free_buf(proc, buffer);
1953			break;
1954		}
1955
1956		case BC_TRANSACTION:
1957		case BC_REPLY: {
1958			struct binder_transaction_data tr;
1959
1960			if (copy_from_user(&tr, ptr, sizeof(tr)))
1961				return -EFAULT;
1962			ptr += sizeof(tr);
1963			binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1964			break;
1965		}
1966
1967		case BC_REGISTER_LOOPER:
1968			binder_debug(BINDER_DEBUG_THREADS,
1969				     "%d:%d BC_REGISTER_LOOPER\n",
1970				     proc->pid, thread->pid);
1971			if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1972				thread->looper |= BINDER_LOOPER_STATE_INVALID;
1973				binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1974					proc->pid, thread->pid);
1975			} else if (proc->requested_threads == 0) {
1976				thread->looper |= BINDER_LOOPER_STATE_INVALID;
1977				binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1978					proc->pid, thread->pid);
1979			} else {
1980				proc->requested_threads--;
1981				proc->requested_threads_started++;
1982			}
1983			thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1984			break;
1985		case BC_ENTER_LOOPER:
1986			binder_debug(BINDER_DEBUG_THREADS,
1987				     "%d:%d BC_ENTER_LOOPER\n",
1988				     proc->pid, thread->pid);
1989			if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1990				thread->looper |= BINDER_LOOPER_STATE_INVALID;
1991				binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1992					proc->pid, thread->pid);
1993			}
1994			thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1995			break;
1996		case BC_EXIT_LOOPER:
1997			binder_debug(BINDER_DEBUG_THREADS,
1998				     "%d:%d BC_EXIT_LOOPER\n",
1999				     proc->pid, thread->pid);
2000			thread->looper |= BINDER_LOOPER_STATE_EXITED;
2001			break;
2002
2003		case BC_REQUEST_DEATH_NOTIFICATION:
2004		case BC_CLEAR_DEATH_NOTIFICATION: {
2005			uint32_t target;
2006			binder_uintptr_t cookie;
2007			struct binder_ref *ref;
2008			struct binder_ref_death *death;
2009
2010			if (get_user(target, (uint32_t __user *)ptr))
2011				return -EFAULT;
2012			ptr += sizeof(uint32_t);
2013			if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2014				return -EFAULT;
2015			ptr += sizeof(binder_uintptr_t);
2016			ref = binder_get_ref(proc, target, false);
2017			if (ref == NULL) {
2018				binder_user_error("%d:%d %s invalid ref %d\n",
2019					proc->pid, thread->pid,
2020					cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2021					"BC_REQUEST_DEATH_NOTIFICATION" :
2022					"BC_CLEAR_DEATH_NOTIFICATION",
2023					target);
2024				break;
2025			}
2026
2027			binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2028				     "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
2029				     proc->pid, thread->pid,
2030				     cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2031				     "BC_REQUEST_DEATH_NOTIFICATION" :
2032				     "BC_CLEAR_DEATH_NOTIFICATION",
2033				     (u64)cookie, ref->debug_id, ref->desc,
2034				     ref->strong, ref->weak, ref->node->debug_id);
2035
2036			if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2037				if (ref->death) {
2038					binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2039						proc->pid, thread->pid);
2040					break;
2041				}
2042				death = kzalloc(sizeof(*death), GFP_KERNEL);
2043				if (death == NULL) {
2044					thread->return_error = BR_ERROR;
2045					binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2046						     "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2047						     proc->pid, thread->pid);
2048					break;
2049				}
2050				binder_stats_created(BINDER_STAT_DEATH);
2051				INIT_LIST_HEAD(&death->work.entry);
2052				death->cookie = cookie;
2053				ref->death = death;
2054				if (ref->node->proc == NULL) {
2055					ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2056					if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2057						list_add_tail(&ref->death->work.entry, &thread->todo);
2058					} else {
2059						list_add_tail(&ref->death->work.entry, &proc->todo);
2060						wake_up_interruptible(&proc->wait);
2061					}
2062				}
2063			} else {
2064				if (ref->death == NULL) {
2065					binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2066						proc->pid, thread->pid);
2067					break;
2068				}
2069				death = ref->death;
2070				if (death->cookie != cookie) {
2071					binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2072						proc->pid, thread->pid,
2073						(u64)death->cookie,
2074						(u64)cookie);
2075					break;
2076				}
2077				ref->death = NULL;
2078				if (list_empty(&death->work.entry)) {
2079					death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2080					if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2081						list_add_tail(&death->work.entry, &thread->todo);
2082					} else {
2083						list_add_tail(&death->work.entry, &proc->todo);
2084						wake_up_interruptible(&proc->wait);
2085					}
2086				} else {
2087					BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2088					death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2089				}
2090			}
2091		} break;
2092		case BC_DEAD_BINDER_DONE: {
2093			struct binder_work *w;
2094			binder_uintptr_t cookie;
2095			struct binder_ref_death *death = NULL;
2096
2097			if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2098				return -EFAULT;
2099
2100			ptr += sizeof(cookie);
2101			list_for_each_entry(w, &proc->delivered_death, entry) {
2102				struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2103
2104				if (tmp_death->cookie == cookie) {
2105					death = tmp_death;
2106					break;
2107				}
2108			}
2109			binder_debug(BINDER_DEBUG_DEAD_BINDER,
2110				     "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2111				     proc->pid, thread->pid, (u64)cookie,
2112				     death);
2113			if (death == NULL) {
2114				binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2115					proc->pid, thread->pid, (u64)cookie);
2116				break;
2117			}
2118
2119			list_del_init(&death->work.entry);
2120			if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2121				death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2122				if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2123					list_add_tail(&death->work.entry, &thread->todo);
2124				} else {
2125					list_add_tail(&death->work.entry, &proc->todo);
2126					wake_up_interruptible(&proc->wait);
2127				}
2128			}
2129		} break;
2130
2131		default:
2132			pr_err("%d:%d unknown command %d\n",
2133			       proc->pid, thread->pid, cmd);
2134			return -EINVAL;
2135		}
2136		*consumed = ptr - buffer;
2137	}
2138	return 0;
2139}
2140
2141static void binder_stat_br(struct binder_proc *proc,
2142			   struct binder_thread *thread, uint32_t cmd)
2143{
2144	trace_binder_return(cmd);
2145	if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2146		binder_stats.br[_IOC_NR(cmd)]++;
2147		proc->stats.br[_IOC_NR(cmd)]++;
2148		thread->stats.br[_IOC_NR(cmd)]++;
2149	}
2150}
2151
2152static int binder_has_proc_work(struct binder_proc *proc,
2153				struct binder_thread *thread)
2154{
2155	return !list_empty(&proc->todo) ||
2156		(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2157}
2158
2159static int binder_has_thread_work(struct binder_thread *thread)
2160{
2161	return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2162		(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2163}
2164
2165static int binder_thread_read(struct binder_proc *proc,
2166			      struct binder_thread *thread,
2167			      binder_uintptr_t binder_buffer, size_t size,
2168			      binder_size_t *consumed, int non_block)
2169{
2170	void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2171	void __user *ptr = buffer + *consumed;
2172	void __user *end = buffer + size;
2173
2174	int ret = 0;
2175	int wait_for_proc_work;
2176
2177	if (*consumed == 0) {
2178		if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2179			return -EFAULT;
2180		ptr += sizeof(uint32_t);
2181	}
2182
2183retry:
2184	wait_for_proc_work = thread->transaction_stack == NULL &&
2185				list_empty(&thread->todo);
2186
2187	if (thread->return_error != BR_OK && ptr < end) {
2188		if (thread->return_error2 != BR_OK) {
2189			if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2190				return -EFAULT;
2191			ptr += sizeof(uint32_t);
2192			binder_stat_br(proc, thread, thread->return_error2);
2193			if (ptr == end)
2194				goto done;
2195			thread->return_error2 = BR_OK;
2196		}
2197		if (put_user(thread->return_error, (uint32_t __user *)ptr))
2198			return -EFAULT;
2199		ptr += sizeof(uint32_t);
2200		binder_stat_br(proc, thread, thread->return_error);
2201		thread->return_error = BR_OK;
2202		goto done;
2203	}
2204
2205
2206	thread->looper |= BINDER_LOOPER_STATE_WAITING;
2207	if (wait_for_proc_work)
2208		proc->ready_threads++;
2209
2210	binder_unlock(__func__);
2211
2212	trace_binder_wait_for_work(wait_for_proc_work,
2213				   !!thread->transaction_stack,
2214				   !list_empty(&thread->todo));
2215	if (wait_for_proc_work) {
2216		if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2217					BINDER_LOOPER_STATE_ENTERED))) {
2218			binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2219				proc->pid, thread->pid, thread->looper);
2220			wait_event_interruptible(binder_user_error_wait,
2221						 binder_stop_on_user_error < 2);
2222		}
2223		binder_set_nice(proc->default_priority);
2224		if (non_block) {
2225			if (!binder_has_proc_work(proc, thread))
2226				ret = -EAGAIN;
2227		} else
2228			ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2229	} else {
2230		if (non_block) {
2231			if (!binder_has_thread_work(thread))
2232				ret = -EAGAIN;
2233		} else
2234			ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2235	}
2236
2237	binder_lock(__func__);
2238
2239	if (wait_for_proc_work)
2240		proc->ready_threads--;
2241	thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2242
2243	if (ret)
2244		return ret;
2245
2246	while (1) {
2247		uint32_t cmd;
2248		struct binder_transaction_data tr;
2249		struct binder_work *w;
2250		struct binder_transaction *t = NULL;
2251
2252		if (!list_empty(&thread->todo)) {
2253			w = list_first_entry(&thread->todo, struct binder_work,
2254					     entry);
2255		} else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2256			w = list_first_entry(&proc->todo, struct binder_work,
2257					     entry);
2258		} else {
2259			/* no data added */
2260			if (ptr - buffer == 4 &&
2261			    !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2262				goto retry;
2263			break;
2264		}
2265
2266		if (end - ptr < sizeof(tr) + 4)
2267			break;
2268
2269		switch (w->type) {
2270		case BINDER_WORK_TRANSACTION: {
2271			t = container_of(w, struct binder_transaction, work);
2272		} break;
2273		case BINDER_WORK_TRANSACTION_COMPLETE: {
2274			cmd = BR_TRANSACTION_COMPLETE;
2275			if (put_user(cmd, (uint32_t __user *)ptr))
2276				return -EFAULT;
2277			ptr += sizeof(uint32_t);
2278
2279			binder_stat_br(proc, thread, cmd);
2280			binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2281				     "%d:%d BR_TRANSACTION_COMPLETE\n",
2282				     proc->pid, thread->pid);
2283
2284			list_del(&w->entry);
2285			kfree(w);
2286			binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2287		} break;
2288		case BINDER_WORK_NODE: {
2289			struct binder_node *node = container_of(w, struct binder_node, work);
2290			uint32_t cmd = BR_NOOP;
2291			const char *cmd_name;
2292			int strong = node->internal_strong_refs || node->local_strong_refs;
2293			int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2294
2295			if (weak && !node->has_weak_ref) {
2296				cmd = BR_INCREFS;
2297				cmd_name = "BR_INCREFS";
2298				node->has_weak_ref = 1;
2299				node->pending_weak_ref = 1;
2300				node->local_weak_refs++;
2301			} else if (strong && !node->has_strong_ref) {
2302				cmd = BR_ACQUIRE;
2303				cmd_name = "BR_ACQUIRE";
2304				node->has_strong_ref = 1;
2305				node->pending_strong_ref = 1;
2306				node->local_strong_refs++;
2307			} else if (!strong && node->has_strong_ref) {
2308				cmd = BR_RELEASE;
2309				cmd_name = "BR_RELEASE";
2310				node->has_strong_ref = 0;
2311			} else if (!weak && node->has_weak_ref) {
2312				cmd = BR_DECREFS;
2313				cmd_name = "BR_DECREFS";
2314				node->has_weak_ref = 0;
2315			}
2316			if (cmd != BR_NOOP) {
2317				if (put_user(cmd, (uint32_t __user *)ptr))
2318					return -EFAULT;
2319				ptr += sizeof(uint32_t);
2320				if (put_user(node->ptr,
2321					     (binder_uintptr_t __user *)ptr))
2322					return -EFAULT;
2323				ptr += sizeof(binder_uintptr_t);
2324				if (put_user(node->cookie,
2325					     (binder_uintptr_t __user *)ptr))
2326					return -EFAULT;
2327				ptr += sizeof(binder_uintptr_t);
2328
2329				binder_stat_br(proc, thread, cmd);
2330				binder_debug(BINDER_DEBUG_USER_REFS,
2331					     "%d:%d %s %d u%016llx c%016llx\n",
2332					     proc->pid, thread->pid, cmd_name,
2333					     node->debug_id,
2334					     (u64)node->ptr, (u64)node->cookie);
2335			} else {
2336				list_del_init(&w->entry);
2337				if (!weak && !strong) {
2338					binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2339						     "%d:%d node %d u%016llx c%016llx deleted\n",
2340						     proc->pid, thread->pid,
2341						     node->debug_id,
2342						     (u64)node->ptr,
2343						     (u64)node->cookie);
2344					rb_erase(&node->rb_node, &proc->nodes);
2345					kfree(node);
2346					binder_stats_deleted(BINDER_STAT_NODE);
2347				} else {
2348					binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2349						     "%d:%d node %d u%016llx c%016llx state unchanged\n",
2350						     proc->pid, thread->pid,
2351						     node->debug_id,
2352						     (u64)node->ptr,
2353						     (u64)node->cookie);
2354				}
2355			}
2356		} break;
2357		case BINDER_WORK_DEAD_BINDER:
2358		case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2359		case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2360			struct binder_ref_death *death;
2361			uint32_t cmd;
2362
2363			death = container_of(w, struct binder_ref_death, work);
2364			if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2365				cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2366			else
2367				cmd = BR_DEAD_BINDER;
2368			if (put_user(cmd, (uint32_t __user *)ptr))
2369				return -EFAULT;
2370			ptr += sizeof(uint32_t);
2371			if (put_user(death->cookie,
2372				     (binder_uintptr_t __user *)ptr))
2373				return -EFAULT;
2374			ptr += sizeof(binder_uintptr_t);
2375			binder_stat_br(proc, thread, cmd);
2376			binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2377				     "%d:%d %s %016llx\n",
2378				      proc->pid, thread->pid,
2379				      cmd == BR_DEAD_BINDER ?
2380				      "BR_DEAD_BINDER" :
2381				      "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2382				      (u64)death->cookie);
2383
2384			if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2385				list_del(&w->entry);
2386				kfree(death);
2387				binder_stats_deleted(BINDER_STAT_DEATH);
2388			} else
2389				list_move(&w->entry, &proc->delivered_death);
2390			if (cmd == BR_DEAD_BINDER)
2391				goto done; /* DEAD_BINDER notifications can cause transactions */
2392		} break;
2393		}
2394
2395		if (!t)
2396			continue;
2397
2398		BUG_ON(t->buffer == NULL);
2399		if (t->buffer->target_node) {
2400			struct binder_node *target_node = t->buffer->target_node;
2401
2402			tr.target.ptr = target_node->ptr;
2403			tr.cookie =  target_node->cookie;
2404			t->saved_priority = task_nice(current);
2405			if (t->priority < target_node->min_priority &&
2406			    !(t->flags & TF_ONE_WAY))
2407				binder_set_nice(t->priority);
2408			else if (!(t->flags & TF_ONE_WAY) ||
2409				 t->saved_priority > target_node->min_priority)
2410				binder_set_nice(target_node->min_priority);
2411			cmd = BR_TRANSACTION;
2412		} else {
2413			tr.target.ptr = 0;
2414			tr.cookie = 0;
2415			cmd = BR_REPLY;
2416		}
2417		tr.code = t->code;
2418		tr.flags = t->flags;
2419		tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2420
2421		if (t->from) {
2422			struct task_struct *sender = t->from->proc->tsk;
2423
2424			tr.sender_pid = task_tgid_nr_ns(sender,
2425							task_active_pid_ns(current));
2426		} else {
2427			tr.sender_pid = 0;
2428		}
2429
2430		tr.data_size = t->buffer->data_size;
2431		tr.offsets_size = t->buffer->offsets_size;
2432		tr.data.ptr.buffer = (binder_uintptr_t)(
2433					(uintptr_t)t->buffer->data +
2434					proc->user_buffer_offset);
2435		tr.data.ptr.offsets = tr.data.ptr.buffer +
2436					ALIGN(t->buffer->data_size,
2437					    sizeof(void *));
2438
2439		if (put_user(cmd, (uint32_t __user *)ptr))
2440			return -EFAULT;
2441		ptr += sizeof(uint32_t);
2442		if (copy_to_user(ptr, &tr, sizeof(tr)))
2443			return -EFAULT;
2444		ptr += sizeof(tr);
2445
2446		trace_binder_transaction_received(t);
2447		binder_stat_br(proc, thread, cmd);
2448		binder_debug(BINDER_DEBUG_TRANSACTION,
2449			     "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2450			     proc->pid, thread->pid,
2451			     (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2452			     "BR_REPLY",
2453			     t->debug_id, t->from ? t->from->proc->pid : 0,
2454			     t->from ? t->from->pid : 0, cmd,
2455			     t->buffer->data_size, t->buffer->offsets_size,
2456			     (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2457
2458		list_del(&t->work.entry);
2459		t->buffer->allow_user_free = 1;
2460		if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2461			t->to_parent = thread->transaction_stack;
2462			t->to_thread = thread;
2463			thread->transaction_stack = t;
2464		} else {
2465			t->buffer->transaction = NULL;
2466			kfree(t);
2467			binder_stats_deleted(BINDER_STAT_TRANSACTION);
2468		}
2469		break;
2470	}
2471
2472done:
2473
2474	*consumed = ptr - buffer;
2475	if (proc->requested_threads + proc->ready_threads == 0 &&
2476	    proc->requested_threads_started < proc->max_threads &&
2477	    (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2478	     BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2479	     /*spawn a new thread if we leave this out */) {
2480		proc->requested_threads++;
2481		binder_debug(BINDER_DEBUG_THREADS,
2482			     "%d:%d BR_SPAWN_LOOPER\n",
2483			     proc->pid, thread->pid);
2484		if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2485			return -EFAULT;
2486		binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2487	}
2488	return 0;
2489}
2490
2491static void binder_release_work(struct list_head *list)
2492{
2493	struct binder_work *w;
2494
2495	while (!list_empty(list)) {
2496		w = list_first_entry(list, struct binder_work, entry);
2497		list_del_init(&w->entry);
2498		switch (w->type) {
2499		case BINDER_WORK_TRANSACTION: {
2500			struct binder_transaction *t;
2501
2502			t = container_of(w, struct binder_transaction, work);
2503			if (t->buffer->target_node &&
2504			    !(t->flags & TF_ONE_WAY)) {
2505				binder_send_failed_reply(t, BR_DEAD_REPLY);
2506			} else {
2507				binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2508					"undelivered transaction %d\n",
2509					t->debug_id);
2510				t->buffer->transaction = NULL;
2511				kfree(t);
2512				binder_stats_deleted(BINDER_STAT_TRANSACTION);
2513			}
2514		} break;
2515		case BINDER_WORK_TRANSACTION_COMPLETE: {
2516			binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2517				"undelivered TRANSACTION_COMPLETE\n");
2518			kfree(w);
2519			binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2520		} break;
2521		case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2522		case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2523			struct binder_ref_death *death;
2524
2525			death = container_of(w, struct binder_ref_death, work);
2526			binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2527				"undelivered death notification, %016llx\n",
2528				(u64)death->cookie);
2529			kfree(death);
2530			binder_stats_deleted(BINDER_STAT_DEATH);
2531		} break;
2532		default:
2533			pr_err("unexpected work type, %d, not freed\n",
2534			       w->type);
2535			break;
2536		}
2537	}
2538
2539}
2540
2541static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2542{
2543	struct binder_thread *thread = NULL;
2544	struct rb_node *parent = NULL;
2545	struct rb_node **p = &proc->threads.rb_node;
2546
2547	while (*p) {
2548		parent = *p;
2549		thread = rb_entry(parent, struct binder_thread, rb_node);
2550
2551		if (current->pid < thread->pid)
2552			p = &(*p)->rb_left;
2553		else if (current->pid > thread->pid)
2554			p = &(*p)->rb_right;
2555		else
2556			break;
2557	}
2558	if (*p == NULL) {
2559		thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2560		if (thread == NULL)
2561			return NULL;
2562		binder_stats_created(BINDER_STAT_THREAD);
2563		thread->proc = proc;
2564		thread->pid = current->pid;
2565		init_waitqueue_head(&thread->wait);
2566		INIT_LIST_HEAD(&thread->todo);
2567		rb_link_node(&thread->rb_node, parent, p);
2568		rb_insert_color(&thread->rb_node, &proc->threads);
2569		thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2570		thread->return_error = BR_OK;
2571		thread->return_error2 = BR_OK;
2572	}
2573	return thread;
2574}
2575
2576static int binder_free_thread(struct binder_proc *proc,
2577			      struct binder_thread *thread)
2578{
2579	struct binder_transaction *t;
2580	struct binder_transaction *send_reply = NULL;
2581	int active_transactions = 0;
2582
2583	rb_erase(&thread->rb_node, &proc->threads);
2584	t = thread->transaction_stack;
2585	if (t && t->to_thread == thread)
2586		send_reply = t;
2587	while (t) {
2588		active_transactions++;
2589		binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2590			     "release %d:%d transaction %d %s, still active\n",
2591			      proc->pid, thread->pid,
2592			     t->debug_id,
2593			     (t->to_thread == thread) ? "in" : "out");
2594
2595		if (t->to_thread == thread) {
2596			t->to_proc = NULL;
2597			t->to_thread = NULL;
2598			if (t->buffer) {
2599				t->buffer->transaction = NULL;
2600				t->buffer = NULL;
2601			}
2602			t = t->to_parent;
2603		} else if (t->from == thread) {
2604			t->from = NULL;
2605			t = t->from_parent;
2606		} else
2607			BUG();
2608	}
2609	if (send_reply)
2610		binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2611	binder_release_work(&thread->todo);
2612	kfree(thread);
2613	binder_stats_deleted(BINDER_STAT_THREAD);
2614	return active_transactions;
2615}
2616
2617static unsigned int binder_poll(struct file *filp,
2618				struct poll_table_struct *wait)
2619{
2620	struct binder_proc *proc = filp->private_data;
2621	struct binder_thread *thread = NULL;
2622	int wait_for_proc_work;
2623
2624	binder_lock(__func__);
2625
2626	thread = binder_get_thread(proc);
2627
2628	wait_for_proc_work = thread->transaction_stack == NULL &&
2629		list_empty(&thread->todo) && thread->return_error == BR_OK;
2630
2631	binder_unlock(__func__);
2632
2633	if (wait_for_proc_work) {
2634		if (binder_has_proc_work(proc, thread))
2635			return POLLIN;
2636		poll_wait(filp, &proc->wait, wait);
2637		if (binder_has_proc_work(proc, thread))
2638			return POLLIN;
2639	} else {
2640		if (binder_has_thread_work(thread))
2641			return POLLIN;
2642		poll_wait(filp, &thread->wait, wait);
2643		if (binder_has_thread_work(thread))
2644			return POLLIN;
2645	}
2646	return 0;
2647}
2648
2649static int binder_ioctl_write_read(struct file *filp,
2650				unsigned int cmd, unsigned long arg,
2651				struct binder_thread *thread)
2652{
2653	int ret = 0;
2654	struct binder_proc *proc = filp->private_data;
2655	unsigned int size = _IOC_SIZE(cmd);
2656	void __user *ubuf = (void __user *)arg;
2657	struct binder_write_read bwr;
2658
2659	if (size != sizeof(struct binder_write_read)) {
2660		ret = -EINVAL;
2661		goto out;
2662	}
2663	if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2664		ret = -EFAULT;
2665		goto out;
2666	}
2667	binder_debug(BINDER_DEBUG_READ_WRITE,
2668		     "%d:%d write %lld at %016llx, read %lld at %016llx\n",
2669		     proc->pid, thread->pid,
2670		     (u64)bwr.write_size, (u64)bwr.write_buffer,
2671		     (u64)bwr.read_size, (u64)bwr.read_buffer);
2672
2673	if (bwr.write_size > 0) {
2674		ret = binder_thread_write(proc, thread,
2675					  bwr.write_buffer,
2676					  bwr.write_size,
2677					  &bwr.write_consumed);
2678		trace_binder_write_done(ret);
2679		if (ret < 0) {
2680			bwr.read_consumed = 0;
2681			if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2682				ret = -EFAULT;
2683			goto out;
2684		}
2685	}
2686	if (bwr.read_size > 0) {
2687		ret = binder_thread_read(proc, thread, bwr.read_buffer,
2688					 bwr.read_size,
2689					 &bwr.read_consumed,
2690					 filp->f_flags & O_NONBLOCK);
2691		trace_binder_read_done(ret);
2692		if (!list_empty(&proc->todo))
2693			wake_up_interruptible(&proc->wait);
2694		if (ret < 0) {
2695			if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2696				ret = -EFAULT;
2697			goto out;
2698		}
2699	}
2700	binder_debug(BINDER_DEBUG_READ_WRITE,
2701		     "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
2702		     proc->pid, thread->pid,
2703		     (u64)bwr.write_consumed, (u64)bwr.write_size,
2704		     (u64)bwr.read_consumed, (u64)bwr.read_size);
2705	if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2706		ret = -EFAULT;
2707		goto out;
2708	}
2709out:
2710	return ret;
2711}
2712
2713static int binder_ioctl_set_ctx_mgr(struct file *filp)
2714{
2715	int ret = 0;
2716	struct binder_proc *proc = filp->private_data;
2717	kuid_t curr_euid = current_euid();
2718
2719	if (binder_context_mgr_node != NULL) {
2720		pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2721		ret = -EBUSY;
2722		goto out;
2723	}
2724	ret = security_binder_set_context_mgr(proc->tsk);
2725	if (ret < 0)
2726		goto out;
2727	if (uid_valid(binder_context_mgr_uid)) {
2728		if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
2729			pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2730			       from_kuid(&init_user_ns, curr_euid),
2731			       from_kuid(&init_user_ns,
2732					binder_context_mgr_uid));
2733			ret = -EPERM;
2734			goto out;
2735		}
2736	} else {
2737		binder_context_mgr_uid = curr_euid;
2738	}
2739	binder_context_mgr_node = binder_new_node(proc, 0, 0);
2740	if (binder_context_mgr_node == NULL) {
2741		ret = -ENOMEM;
2742		goto out;
2743	}
2744	binder_context_mgr_node->local_weak_refs++;
2745	binder_context_mgr_node->local_strong_refs++;
2746	binder_context_mgr_node->has_strong_ref = 1;
2747	binder_context_mgr_node->has_weak_ref = 1;
2748out:
2749	return ret;
2750}
2751
2752static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2753{
2754	int ret;
2755	struct binder_proc *proc = filp->private_data;
2756	struct binder_thread *thread;
2757	unsigned int size = _IOC_SIZE(cmd);
2758	void __user *ubuf = (void __user *)arg;
2759
2760	/*pr_info("binder_ioctl: %d:%d %x %lx\n",
2761			proc->pid, current->pid, cmd, arg);*/
2762
2763	if (unlikely(current->mm != proc->vma_vm_mm)) {
2764		pr_err("current mm mismatch proc mm\n");
2765		return -EINVAL;
2766	}
2767	trace_binder_ioctl(cmd, arg);
2768
2769	ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2770	if (ret)
2771		goto err_unlocked;
2772
2773	binder_lock(__func__);
2774	thread = binder_get_thread(proc);
2775	if (thread == NULL) {
2776		ret = -ENOMEM;
2777		goto err;
2778	}
2779
2780	switch (cmd) {
2781	case BINDER_WRITE_READ:
2782		ret = binder_ioctl_write_read(filp, cmd, arg, thread);
2783		if (ret)
2784			goto err;
2785		break;
2786	case BINDER_SET_MAX_THREADS:
2787		if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2788			ret = -EINVAL;
2789			goto err;
2790		}
2791		break;
2792	case BINDER_SET_CONTEXT_MGR:
2793		ret = binder_ioctl_set_ctx_mgr(filp);
2794		if (ret)
2795			goto err;
2796		break;
2797	case BINDER_THREAD_EXIT:
2798		binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2799			     proc->pid, thread->pid);
2800		binder_free_thread(proc, thread);
2801		thread = NULL;
2802		break;
2803	case BINDER_VERSION: {
2804		struct binder_version __user *ver = ubuf;
2805
2806		if (size != sizeof(struct binder_version)) {
2807			ret = -EINVAL;
2808			goto err;
2809		}
2810		if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
2811			     &ver->protocol_version)) {
2812			ret = -EINVAL;
2813			goto err;
2814		}
2815		break;
2816	}
2817	default:
2818		ret = -EINVAL;
2819		goto err;
2820	}
2821	ret = 0;
2822err:
2823	if (thread)
2824		thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2825	binder_unlock(__func__);
2826	wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2827	if (ret && ret != -ERESTARTSYS)
2828		pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2829err_unlocked:
2830	trace_binder_ioctl_done(ret);
2831	return ret;
2832}
2833
2834static void binder_vma_open(struct vm_area_struct *vma)
2835{
2836	struct binder_proc *proc = vma->vm_private_data;
2837
2838	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2839		     "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2840		     proc->pid, vma->vm_start, vma->vm_end,
2841		     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2842		     (unsigned long)pgprot_val(vma->vm_page_prot));
2843}
2844
2845static void binder_vma_close(struct vm_area_struct *vma)
2846{
2847	struct binder_proc *proc = vma->vm_private_data;
2848
2849	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2850		     "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2851		     proc->pid, vma->vm_start, vma->vm_end,
2852		     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2853		     (unsigned long)pgprot_val(vma->vm_page_prot));
2854	proc->vma = NULL;
2855	proc->vma_vm_mm = NULL;
2856	binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2857}
2858
2859static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2860{
2861	return VM_FAULT_SIGBUS;
2862}
2863
2864static const struct vm_operations_struct binder_vm_ops = {
2865	.open = binder_vma_open,
2866	.close = binder_vma_close,
2867	.fault = binder_vm_fault,
2868};
2869
2870static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2871{
2872	int ret;
2873	struct vm_struct *area;
2874	struct binder_proc *proc = filp->private_data;
2875	const char *failure_string;
2876	struct binder_buffer *buffer;
2877
2878	if (proc->tsk != current)
2879		return -EINVAL;
2880
2881	if ((vma->vm_end - vma->vm_start) > SZ_4M)
2882		vma->vm_end = vma->vm_start + SZ_4M;
2883
2884	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2885		     "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2886		     proc->pid, vma->vm_start, vma->vm_end,
2887		     (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2888		     (unsigned long)pgprot_val(vma->vm_page_prot));
2889
2890	if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2891		ret = -EPERM;
2892		failure_string = "bad vm_flags";
2893		goto err_bad_arg;
2894	}
2895	vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2896
2897	mutex_lock(&binder_mmap_lock);
2898	if (proc->buffer) {
2899		ret = -EBUSY;
2900		failure_string = "already mapped";
2901		goto err_already_mapped;
2902	}
2903
2904	area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2905	if (area == NULL) {
2906		ret = -ENOMEM;
2907		failure_string = "get_vm_area";
2908		goto err_get_vm_area_failed;
2909	}
2910	proc->buffer = area->addr;
2911	proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2912	mutex_unlock(&binder_mmap_lock);
2913
2914#ifdef CONFIG_CPU_CACHE_VIPT
2915	if (cache_is_vipt_aliasing()) {
2916		while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2917			pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2918			vma->vm_start += PAGE_SIZE;
2919		}
2920	}
2921#endif
2922	proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2923	if (proc->pages == NULL) {
2924		ret = -ENOMEM;
2925		failure_string = "alloc page array";
2926		goto err_alloc_pages_failed;
2927	}
2928	proc->buffer_size = vma->vm_end - vma->vm_start;
2929
2930	vma->vm_ops = &binder_vm_ops;
2931	vma->vm_private_data = proc;
2932
2933	if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2934		ret = -ENOMEM;
2935		failure_string = "alloc small buf";
2936		goto err_alloc_small_buf_failed;
2937	}
2938	buffer = proc->buffer;
2939	INIT_LIST_HEAD(&proc->buffers);
2940	list_add(&buffer->entry, &proc->buffers);
2941	buffer->free = 1;
2942	binder_insert_free_buffer(proc, buffer);
2943	proc->free_async_space = proc->buffer_size / 2;
2944	barrier();
2945	proc->files = get_files_struct(current);
2946	proc->vma = vma;
2947	proc->vma_vm_mm = vma->vm_mm;
2948
2949	/*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2950		 proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2951	return 0;
2952
2953err_alloc_small_buf_failed:
2954	kfree(proc->pages);
2955	proc->pages = NULL;
2956err_alloc_pages_failed:
2957	mutex_lock(&binder_mmap_lock);
2958	vfree(proc->buffer);
2959	proc->buffer = NULL;
2960err_get_vm_area_failed:
2961err_already_mapped:
2962	mutex_unlock(&binder_mmap_lock);
2963err_bad_arg:
2964	pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2965	       proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2966	return ret;
2967}
2968
2969static int binder_open(struct inode *nodp, struct file *filp)
2970{
2971	struct binder_proc *proc;
2972
2973	binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2974		     current->group_leader->pid, current->pid);
2975
2976	proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2977	if (proc == NULL)
2978		return -ENOMEM;
2979	get_task_struct(current);
2980	proc->tsk = current;
2981	proc->vma_vm_mm = current->mm;
2982	INIT_LIST_HEAD(&proc->todo);
2983	init_waitqueue_head(&proc->wait);
2984	proc->default_priority = task_nice(current);
2985
2986	binder_lock(__func__);
2987
2988	binder_stats_created(BINDER_STAT_PROC);
2989	hlist_add_head(&proc->proc_node, &binder_procs);
2990	proc->pid = current->group_leader->pid;
2991	INIT_LIST_HEAD(&proc->delivered_death);
2992	filp->private_data = proc;
2993
2994	binder_unlock(__func__);
2995
2996	if (binder_debugfs_dir_entry_proc) {
2997		char strbuf[11];
2998
2999		snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
3000		proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
3001			binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
3002	}
3003
3004	return 0;
3005}
3006
3007static int binder_flush(struct file *filp, fl_owner_t id)
3008{
3009	struct binder_proc *proc = filp->private_data;
3010
3011	binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
3012
3013	return 0;
3014}
3015
3016static void binder_deferred_flush(struct binder_proc *proc)
3017{
3018	struct rb_node *n;
3019	int wake_count = 0;
3020
3021	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
3022		struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
3023
3024		thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3025		if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
3026			wake_up_interruptible(&thread->wait);
3027			wake_count++;
3028		}
3029	}
3030	wake_up_interruptible_all(&proc->wait);
3031
3032	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3033		     "binder_flush: %d woke %d threads\n", proc->pid,
3034		     wake_count);
3035}
3036
3037static int binder_release(struct inode *nodp, struct file *filp)
3038{
3039	struct binder_proc *proc = filp->private_data;
3040
3041	debugfs_remove(proc->debugfs_entry);
3042	binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
3043
3044	return 0;
3045}
3046
3047static int binder_node_release(struct binder_node *node, int refs)
3048{
3049	struct binder_ref *ref;
3050	int death = 0;
3051
3052	list_del_init(&node->work.entry);
3053	binder_release_work(&node->async_todo);
3054
3055	if (hlist_empty(&node->refs)) {
3056		kfree(node);
3057		binder_stats_deleted(BINDER_STAT_NODE);
3058
3059		return refs;
3060	}
3061
3062	node->proc = NULL;
3063	node->local_strong_refs = 0;
3064	node->local_weak_refs = 0;
3065	hlist_add_head(&node->dead_node, &binder_dead_nodes);
3066
3067	hlist_for_each_entry(ref, &node->refs, node_entry) {
3068		refs++;
3069
3070		if (!ref->death)
3071			continue;
3072
3073		death++;
3074
3075		if (list_empty(&ref->death->work.entry)) {
3076			ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3077			list_add_tail(&ref->death->work.entry,
3078				      &ref->proc->todo);
3079			wake_up_interruptible(&ref->proc->wait);
3080		} else
3081			BUG();
3082	}
3083
3084	binder_debug(BINDER_DEBUG_DEAD_BINDER,
3085		     "node %d now dead, refs %d, death %d\n",
3086		     node->debug_id, refs, death);
3087
3088	return refs;
3089}
3090
3091static void binder_deferred_release(struct binder_proc *proc)
3092{
3093	struct binder_transaction *t;
3094	struct rb_node *n;
3095	int threads, nodes, incoming_refs, outgoing_refs, buffers,
3096		active_transactions, page_count;
3097
3098	BUG_ON(proc->vma);
3099	BUG_ON(proc->files);
3100
3101	hlist_del(&proc->proc_node);
3102
3103	if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
3104		binder_debug(BINDER_DEBUG_DEAD_BINDER,
3105			     "%s: %d context_mgr_node gone\n",
3106			     __func__, proc->pid);
3107		binder_context_mgr_node = NULL;
3108	}
3109
3110	threads = 0;
3111	active_transactions = 0;
3112	while ((n = rb_first(&proc->threads))) {
3113		struct binder_thread *thread;
3114
3115		thread = rb_entry(n, struct binder_thread, rb_node);
3116		threads++;
3117		active_transactions += binder_free_thread(proc, thread);
3118	}
3119
3120	nodes = 0;
3121	incoming_refs = 0;
3122	while ((n = rb_first(&proc->nodes))) {
3123		struct binder_node *node;
3124
3125		node = rb_entry(n, struct binder_node, rb_node);
3126		nodes++;
3127		rb_erase(&node->rb_node, &proc->nodes);
3128		incoming_refs = binder_node_release(node, incoming_refs);
3129	}
3130
3131	outgoing_refs = 0;
3132	while ((n = rb_first(&proc->refs_by_desc))) {
3133		struct binder_ref *ref;
3134
3135		ref = rb_entry(n, struct binder_ref, rb_node_desc);
3136		outgoing_refs++;
3137		binder_delete_ref(ref);
3138	}
3139
3140	binder_release_work(&proc->todo);
3141	binder_release_work(&proc->delivered_death);
3142
3143	buffers = 0;
3144	while ((n = rb_first(&proc->allocated_buffers))) {
3145		struct binder_buffer *buffer;
3146
3147		buffer = rb_entry(n, struct binder_buffer, rb_node);
3148
3149		t = buffer->transaction;
3150		if (t) {
3151			t->buffer = NULL;
3152			buffer->transaction = NULL;
3153			pr_err("release proc %d, transaction %d, not freed\n",
3154			       proc->pid, t->debug_id);
3155			/*BUG();*/
3156		}
3157
3158		binder_free_buf(proc, buffer);
3159		buffers++;
3160	}
3161
3162	binder_stats_deleted(BINDER_STAT_PROC);
3163
3164	page_count = 0;
3165	if (proc->pages) {
3166		int i;
3167
3168		for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3169			void *page_addr;
3170
3171			if (!proc->pages[i])
3172				continue;
3173
3174			page_addr = proc->buffer + i * PAGE_SIZE;
3175			binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3176				     "%s: %d: page %d at %p not freed\n",
3177				     __func__, proc->pid, i, page_addr);
3178			unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3179			__free_page(proc->pages[i]);
3180			page_count++;
3181		}
3182		kfree(proc->pages);
3183		vfree(proc->buffer);
3184	}
3185
3186	put_task_struct(proc->tsk);
3187
3188	binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3189		     "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3190		     __func__, proc->pid, threads, nodes, incoming_refs,
3191		     outgoing_refs, active_transactions, buffers, page_count);
3192
3193	kfree(proc);
3194}
3195
3196static void binder_deferred_func(struct work_struct *work)
3197{
3198	struct binder_proc *proc;
3199	struct files_struct *files;
3200
3201	int defer;
3202
3203	do {
3204		binder_lock(__func__);
3205		mutex_lock(&binder_deferred_lock);
3206		if (!hlist_empty(&binder_deferred_list)) {
3207			proc = hlist_entry(binder_deferred_list.first,
3208					struct binder_proc, deferred_work_node);
3209			hlist_del_init(&proc->deferred_work_node);
3210			defer = proc->deferred_work;
3211			proc->deferred_work = 0;
3212		} else {
3213			proc = NULL;
3214			defer = 0;
3215		}
3216		mutex_unlock(&binder_deferred_lock);
3217
3218		files = NULL;
3219		if (defer & BINDER_DEFERRED_PUT_FILES) {
3220			files = proc->files;
3221			if (files)
3222				proc->files = NULL;
3223		}
3224
3225		if (defer & BINDER_DEFERRED_FLUSH)
3226			binder_deferred_flush(proc);
3227
3228		if (defer & BINDER_DEFERRED_RELEASE)
3229			binder_deferred_release(proc); /* frees proc */
3230
3231		binder_unlock(__func__);
3232		if (files)
3233			put_files_struct(files);
3234	} while (proc);
3235}
3236static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3237
3238static void
3239binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3240{
3241	mutex_lock(&binder_deferred_lock);
3242	proc->deferred_work |= defer;
3243	if (hlist_unhashed(&proc->deferred_work_node)) {
3244		hlist_add_head(&proc->deferred_work_node,
3245				&binder_deferred_list);
3246		schedule_work(&binder_deferred_work);
3247	}
3248	mutex_unlock(&binder_deferred_lock);
3249}
3250
3251static void print_binder_transaction(struct seq_file *m, const char *prefix,
3252				     struct binder_transaction *t)
3253{
3254	seq_printf(m,
3255		   "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3256		   prefix, t->debug_id, t,
3257		   t->from ? t->from->proc->pid : 0,
3258		   t->from ? t->from->pid : 0,
3259		   t->to_proc ? t->to_proc->pid : 0,
3260		   t->to_thread ? t->to_thread->pid : 0,
3261		   t->code, t->flags, t->priority, t->need_reply);
3262	if (t->buffer == NULL) {
3263		seq_puts(m, " buffer free\n");
3264		return;
3265	}
3266	if (t->buffer->target_node)
3267		seq_printf(m, " node %d",
3268			   t->buffer->target_node->debug_id);
3269	seq_printf(m, " size %zd:%zd data %p\n",
3270		   t->buffer->data_size, t->buffer->offsets_size,
3271		   t->buffer->data);
3272}
3273
3274static void print_binder_buffer(struct seq_file *m, const char *prefix,
3275				struct binder_buffer *buffer)
3276{
3277	seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3278		   prefix, buffer->debug_id, buffer->data,
3279		   buffer->data_size, buffer->offsets_size,
3280		   buffer->transaction ? "active" : "delivered");
3281}
3282
3283static void print_binder_work(struct seq_file *m, const char *prefix,
3284			      const char *transaction_prefix,
3285			      struct binder_work *w)
3286{
3287	struct binder_node *node;
3288	struct binder_transaction *t;
3289
3290	switch (w->type) {
3291	case BINDER_WORK_TRANSACTION:
3292		t = container_of(w, struct binder_transaction, work);
3293		print_binder_transaction(m, transaction_prefix, t);
3294		break;
3295	case BINDER_WORK_TRANSACTION_COMPLETE:
3296		seq_printf(m, "%stransaction complete\n", prefix);
3297		break;
3298	case BINDER_WORK_NODE:
3299		node = container_of(w, struct binder_node, work);
3300		seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3301			   prefix, node->debug_id,
3302			   (u64)node->ptr, (u64)node->cookie);
3303		break;
3304	case BINDER_WORK_DEAD_BINDER:
3305		seq_printf(m, "%shas dead binder\n", prefix);
3306		break;
3307	case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3308		seq_printf(m, "%shas cleared dead binder\n", prefix);
3309		break;
3310	case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3311		seq_printf(m, "%shas cleared death notification\n", prefix);
3312		break;
3313	default:
3314		seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3315		break;
3316	}
3317}
3318
3319static void print_binder_thread(struct seq_file *m,
3320				struct binder_thread *thread,
3321				int print_always)
3322{
3323	struct binder_transaction *t;
3324	struct binder_work *w;
3325	size_t start_pos = m->count;
3326	size_t header_pos;
3327
3328	seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3329	header_pos = m->count;
3330	t = thread->transaction_stack;
3331	while (t) {
3332		if (t->from == thread) {
3333			print_binder_transaction(m,
3334						 "    outgoing transaction", t);
3335			t = t->from_parent;
3336		} else if (t->to_thread == thread) {
3337			print_binder_transaction(m,
3338						 "    incoming transaction", t);
3339			t = t->to_parent;
3340		} else {
3341			print_binder_transaction(m, "    bad transaction", t);
3342			t = NULL;
3343		}
3344	}
3345	list_for_each_entry(w, &thread->todo, entry) {
3346		print_binder_work(m, "    ", "    pending transaction", w);
3347	}
3348	if (!print_always && m->count == header_pos)
3349		m->count = start_pos;
3350}
3351
3352static void print_binder_node(struct seq_file *m, struct binder_node *node)
3353{
3354	struct binder_ref *ref;
3355	struct binder_work *w;
3356	int count;
3357
3358	count = 0;
3359	hlist_for_each_entry(ref, &node->refs, node_entry)
3360		count++;
3361
3362	seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3363		   node->debug_id, (u64)node->ptr, (u64)node->cookie,
3364		   node->has_strong_ref, node->has_weak_ref,
3365		   node->local_strong_refs, node->local_weak_refs,
3366		   node->internal_strong_refs, count);
3367	if (count) {
3368		seq_puts(m, " proc");
3369		hlist_for_each_entry(ref, &node->refs, node_entry)
3370			seq_printf(m, " %d", ref->proc->pid);
3371	}
3372	seq_puts(m, "\n");
3373	list_for_each_entry(w, &node->async_todo, entry)
3374		print_binder_work(m, "    ",
3375				  "    pending async transaction", w);
3376}
3377
3378static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3379{
3380	seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3381		   ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3382		   ref->node->debug_id, ref->strong, ref->weak, ref->death);
3383}
3384
3385static void print_binder_proc(struct seq_file *m,
3386			      struct binder_proc *proc, int print_all)
3387{
3388	struct binder_work *w;
3389	struct rb_node *n;
3390	size_t start_pos = m->count;
3391	size_t header_pos;
3392
3393	seq_printf(m, "proc %d\n", proc->pid);
3394	header_pos = m->count;
3395
3396	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3397		print_binder_thread(m, rb_entry(n, struct binder_thread,
3398						rb_node), print_all);
3399	for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3400		struct binder_node *node = rb_entry(n, struct binder_node,
3401						    rb_node);
3402		if (print_all || node->has_async_transaction)
3403			print_binder_node(m, node);
3404	}
3405	if (print_all) {
3406		for (n = rb_first(&proc->refs_by_desc);
3407		     n != NULL;
3408		     n = rb_next(n))
3409			print_binder_ref(m, rb_entry(n, struct binder_ref,
3410						     rb_node_desc));
3411	}
3412	for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3413		print_binder_buffer(m, "  buffer",
3414				    rb_entry(n, struct binder_buffer, rb_node));
3415	list_for_each_entry(w, &proc->todo, entry)
3416		print_binder_work(m, "  ", "  pending transaction", w);
3417	list_for_each_entry(w, &proc->delivered_death, entry) {
3418		seq_puts(m, "  has delivered dead binder\n");
3419		break;
3420	}
3421	if (!print_all && m->count == header_pos)
3422		m->count = start_pos;
3423}
3424
3425static const char * const binder_return_strings[] = {
3426	"BR_ERROR",
3427	"BR_OK",
3428	"BR_TRANSACTION",
3429	"BR_REPLY",
3430	"BR_ACQUIRE_RESULT",
3431	"BR_DEAD_REPLY",
3432	"BR_TRANSACTION_COMPLETE",
3433	"BR_INCREFS",
3434	"BR_ACQUIRE",
3435	"BR_RELEASE",
3436	"BR_DECREFS",
3437	"BR_ATTEMPT_ACQUIRE",
3438	"BR_NOOP",
3439	"BR_SPAWN_LOOPER",
3440	"BR_FINISHED",
3441	"BR_DEAD_BINDER",
3442	"BR_CLEAR_DEATH_NOTIFICATION_DONE",
3443	"BR_FAILED_REPLY"
3444};
3445
3446static const char * const binder_command_strings[] = {
3447	"BC_TRANSACTION",
3448	"BC_REPLY",
3449	"BC_ACQUIRE_RESULT",
3450	"BC_FREE_BUFFER",
3451	"BC_INCREFS",
3452	"BC_ACQUIRE",
3453	"BC_RELEASE",
3454	"BC_DECREFS",
3455	"BC_INCREFS_DONE",
3456	"BC_ACQUIRE_DONE",
3457	"BC_ATTEMPT_ACQUIRE",
3458	"BC_REGISTER_LOOPER",
3459	"BC_ENTER_LOOPER",
3460	"BC_EXIT_LOOPER",
3461	"BC_REQUEST_DEATH_NOTIFICATION",
3462	"BC_CLEAR_DEATH_NOTIFICATION",
3463	"BC_DEAD_BINDER_DONE"
3464};
3465
3466static const char * const binder_objstat_strings[] = {
3467	"proc",
3468	"thread",
3469	"node",
3470	"ref",
3471	"death",
3472	"transaction",
3473	"transaction_complete"
3474};
3475
3476static void print_binder_stats(struct seq_file *m, const char *prefix,
3477			       struct binder_stats *stats)
3478{
3479	int i;
3480
3481	BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3482		     ARRAY_SIZE(binder_command_strings));
3483	for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3484		if (stats->bc[i])
3485			seq_printf(m, "%s%s: %d\n", prefix,
3486				   binder_command_strings[i], stats->bc[i]);
3487	}
3488
3489	BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3490		     ARRAY_SIZE(binder_return_strings));
3491	for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3492		if (stats->br[i])
3493			seq_printf(m, "%s%s: %d\n", prefix,
3494				   binder_return_strings[i], stats->br[i]);
3495	}
3496
3497	BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3498		     ARRAY_SIZE(binder_objstat_strings));
3499	BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3500		     ARRAY_SIZE(stats->obj_deleted));
3501	for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3502		if (stats->obj_created[i] || stats->obj_deleted[i])
3503			seq_printf(m, "%s%s: active %d total %d\n", prefix,
3504				binder_objstat_strings[i],
3505				stats->obj_created[i] - stats->obj_deleted[i],
3506				stats->obj_created[i]);
3507	}
3508}
3509
3510static void print_binder_proc_stats(struct seq_file *m,
3511				    struct binder_proc *proc)
3512{
3513	struct binder_work *w;
3514	struct rb_node *n;
3515	int count, strong, weak;
3516
3517	seq_printf(m, "proc %d\n", proc->pid);
3518	count = 0;
3519	for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3520		count++;
3521	seq_printf(m, "  threads: %d\n", count);
3522	seq_printf(m, "  requested threads: %d+%d/%d\n"
3523			"  ready threads %d\n"
3524			"  free async space %zd\n", proc->requested_threads,
3525			proc->requested_threads_started, proc->max_threads,
3526			proc->ready_threads, proc->free_async_space);
3527	count = 0;
3528	for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3529		count++;
3530	seq_printf(m, "  nodes: %d\n", count);
3531	count = 0;
3532	strong = 0;
3533	weak = 0;
3534	for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3535		struct binder_ref *ref = rb_entry(n, struct binder_ref,
3536						  rb_node_desc);
3537		count++;
3538		strong += ref->strong;
3539		weak += ref->weak;
3540	}
3541	seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
3542
3543	count = 0;
3544	for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3545		count++;
3546	seq_printf(m, "  buffers: %d\n", count);
3547
3548	count = 0;
3549	list_for_each_entry(w, &proc->todo, entry) {
3550		switch (w->type) {
3551		case BINDER_WORK_TRANSACTION:
3552			count++;
3553			break;
3554		default:
3555			break;
3556		}
3557	}
3558	seq_printf(m, "  pending transactions: %d\n", count);
3559
3560	print_binder_stats(m, "  ", &proc->stats);
3561}
3562
3563
3564static int binder_state_show(struct seq_file *m, void *unused)
3565{
3566	struct binder_proc *proc;
3567	struct binder_node *node;
3568	int do_lock = !binder_debug_no_lock;
3569
3570	if (do_lock)
3571		binder_lock(__func__);
3572
3573	seq_puts(m, "binder state:\n");
3574
3575	if (!hlist_empty(&binder_dead_nodes))
3576		seq_puts(m, "dead nodes:\n");
3577	hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3578		print_binder_node(m, node);
3579
3580	hlist_for_each_entry(proc, &binder_procs, proc_node)
3581		print_binder_proc(m, proc, 1);
3582	if (do_lock)
3583		binder_unlock(__func__);
3584	return 0;
3585}
3586
3587static int binder_stats_show(struct seq_file *m, void *unused)
3588{
3589	struct binder_proc *proc;
3590	int do_lock = !binder_debug_no_lock;
3591
3592	if (do_lock)
3593		binder_lock(__func__);
3594
3595	seq_puts(m, "binder stats:\n");
3596
3597	print_binder_stats(m, "", &binder_stats);
3598
3599	hlist_for_each_entry(proc, &binder_procs, proc_node)
3600		print_binder_proc_stats(m, proc);
3601	if (do_lock)
3602		binder_unlock(__func__);
3603	return 0;
3604}
3605
3606static int binder_transactions_show(struct seq_file *m, void *unused)
3607{
3608	struct binder_proc *proc;
3609	int do_lock = !binder_debug_no_lock;
3610
3611	if (do_lock)
3612		binder_lock(__func__);
3613
3614	seq_puts(m, "binder transactions:\n");
3615	hlist_for_each_entry(proc, &binder_procs, proc_node)
3616		print_binder_proc(m, proc, 0);
3617	if (do_lock)
3618		binder_unlock(__func__);
3619	return 0;
3620}
3621
3622static int binder_proc_show(struct seq_file *m, void *unused)
3623{
3624	struct binder_proc *itr;
3625	struct binder_proc *proc = m->private;
3626	int do_lock = !binder_debug_no_lock;
3627	bool valid_proc = false;
3628
3629	if (do_lock)
3630		binder_lock(__func__);
3631
3632	hlist_for_each_entry(itr, &binder_procs, proc_node) {
3633		if (itr == proc) {
3634			valid_proc = true;
3635			break;
3636		}
3637	}
3638	if (valid_proc) {
3639		seq_puts(m, "binder proc state:\n");
3640		print_binder_proc(m, proc, 1);
3641	}
3642	if (do_lock)
3643		binder_unlock(__func__);
3644	return 0;
3645}
3646
3647static void print_binder_transaction_log_entry(struct seq_file *m,
3648					struct binder_transaction_log_entry *e)
3649{
3650	seq_printf(m,
3651		   "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3652		   e->debug_id, (e->call_type == 2) ? "reply" :
3653		   ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3654		   e->from_thread, e->to_proc, e->to_thread, e->to_node,
3655		   e->target_handle, e->data_size, e->offsets_size);
3656}
3657
3658static int binder_transaction_log_show(struct seq_file *m, void *unused)
3659{
3660	struct binder_transaction_log *log = m->private;
3661	int i;
3662
3663	if (log->full) {
3664		for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3665			print_binder_transaction_log_entry(m, &log->entry[i]);
3666	}
3667	for (i = 0; i < log->next; i++)
3668		print_binder_transaction_log_entry(m, &log->entry[i]);
3669	return 0;
3670}
3671
3672static const struct file_operations binder_fops = {
3673	.owner = THIS_MODULE,
3674	.poll = binder_poll,
3675	.unlocked_ioctl = binder_ioctl,
3676	.compat_ioctl = binder_ioctl,
3677	.mmap = binder_mmap,
3678	.open = binder_open,
3679	.flush = binder_flush,
3680	.release = binder_release,
3681};
3682
3683static struct miscdevice binder_miscdev = {
3684	.minor = MISC_DYNAMIC_MINOR,
3685	.name = "binder",
3686	.fops = &binder_fops
3687};
3688
3689BINDER_DEBUG_ENTRY(state);
3690BINDER_DEBUG_ENTRY(stats);
3691BINDER_DEBUG_ENTRY(transactions);
3692BINDER_DEBUG_ENTRY(transaction_log);
3693
3694static int __init binder_init(void)
3695{
3696	int ret;
3697
3698	binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3699	if (binder_debugfs_dir_entry_root)
3700		binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3701						 binder_debugfs_dir_entry_root);
3702	ret = misc_register(&binder_miscdev);
3703	if (binder_debugfs_dir_entry_root) {
3704		debugfs_create_file("state",
3705				    S_IRUGO,
3706				    binder_debugfs_dir_entry_root,
3707				    NULL,
3708				    &binder_state_fops);
3709		debugfs_create_file("stats",
3710				    S_IRUGO,
3711				    binder_debugfs_dir_entry_root,
3712				    NULL,
3713				    &binder_stats_fops);
3714		debugfs_create_file("transactions",
3715				    S_IRUGO,
3716				    binder_debugfs_dir_entry_root,
3717				    NULL,
3718				    &binder_transactions_fops);
3719		debugfs_create_file("transaction_log",
3720				    S_IRUGO,
3721				    binder_debugfs_dir_entry_root,
3722				    &binder_transaction_log,
3723				    &binder_transaction_log_fops);
3724		debugfs_create_file("failed_transaction_log",
3725				    S_IRUGO,
3726				    binder_debugfs_dir_entry_root,
3727				    &binder_transaction_log_failed,
3728				    &binder_transaction_log_fops);
3729	}
3730	return ret;
3731}
3732
3733device_initcall(binder_init);
3734
3735#define CREATE_TRACE_POINTS
3736#include "binder_trace.h"
3737
3738MODULE_LICENSE("GPL v2");