3 * Android IPC Subsystem
5 * Copyright (C) 2007-2008 Google, Inc.
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.
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.
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20 #include <asm/cacheflush.h>
21 #include <linux/fdtable.h>
22 #include <linux/file.h>
23 #include <linux/freezer.h>
25 #include <linux/list.h>
26 #include <linux/miscdevice.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>
42 #ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
43 #define BINDER_IPC_32BIT 1
46 #include <uapi/linux/android/binder.h>
47 #include "binder_trace.h"
49 static DEFINE_MUTEX(binder_main_lock);
50 static DEFINE_MUTEX(binder_deferred_lock);
51 static DEFINE_MUTEX(binder_mmap_lock);
53 static HLIST_HEAD(binder_procs);
54 static HLIST_HEAD(binder_deferred_list);
55 static HLIST_HEAD(binder_dead_nodes);
57 static struct dentry *binder_debugfs_dir_entry_root;
58 static struct dentry *binder_debugfs_dir_entry_proc;
59 static struct binder_node *binder_context_mgr_node;
60 static kuid_t binder_context_mgr_uid = INVALID_UID;
61 static int binder_last_id;
62 static struct workqueue_struct *binder_deferred_workqueue;
64 #define BINDER_DEBUG_ENTRY(name) \
65 static int binder_##name##_open(struct inode *inode, struct file *file) \
67 return single_open(file, binder_##name##_show, inode->i_private); \
70 static const struct file_operations binder_##name##_fops = { \
71 .owner = THIS_MODULE, \
72 .open = binder_##name##_open, \
74 .llseek = seq_lseek, \
75 .release = single_release, \
78 static int binder_proc_show(struct seq_file *m, void *unused);
79 BINDER_DEBUG_ENTRY(proc);
81 /* This is only defined in include/asm-arm/sizes.h */
87 #define SZ_4M 0x400000
90 #define FORBIDDEN_MMAP_FLAGS (VM_WRITE)
92 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
95 BINDER_DEBUG_USER_ERROR = 1U << 0,
96 BINDER_DEBUG_FAILED_TRANSACTION = 1U << 1,
97 BINDER_DEBUG_DEAD_TRANSACTION = 1U << 2,
98 BINDER_DEBUG_OPEN_CLOSE = 1U << 3,
99 BINDER_DEBUG_DEAD_BINDER = 1U << 4,
100 BINDER_DEBUG_DEATH_NOTIFICATION = 1U << 5,
101 BINDER_DEBUG_READ_WRITE = 1U << 6,
102 BINDER_DEBUG_USER_REFS = 1U << 7,
103 BINDER_DEBUG_THREADS = 1U << 8,
104 BINDER_DEBUG_TRANSACTION = 1U << 9,
105 BINDER_DEBUG_TRANSACTION_COMPLETE = 1U << 10,
106 BINDER_DEBUG_FREE_BUFFER = 1U << 11,
107 BINDER_DEBUG_INTERNAL_REFS = 1U << 12,
108 BINDER_DEBUG_BUFFER_ALLOC = 1U << 13,
109 BINDER_DEBUG_PRIORITY_CAP = 1U << 14,
110 BINDER_DEBUG_BUFFER_ALLOC_ASYNC = 1U << 15,
112 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
113 BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
114 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
116 static bool binder_debug_no_lock;
117 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
119 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
120 static int binder_stop_on_user_error;
122 static int binder_set_stop_on_user_error(const char *val,
123 struct kernel_param *kp)
127 ret = param_set_int(val, kp);
128 if (binder_stop_on_user_error < 2)
129 wake_up(&binder_user_error_wait);
132 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
133 param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
135 #define binder_debug(mask, x...) \
137 if (binder_debug_mask & mask) \
141 #define binder_user_error(x...) \
143 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
145 if (binder_stop_on_user_error) \
146 binder_stop_on_user_error = 2; \
149 enum binder_stat_types {
155 BINDER_STAT_TRANSACTION,
156 BINDER_STAT_TRANSACTION_COMPLETE,
160 struct binder_stats {
161 int br[_IOC_NR(BR_FAILED_REPLY) + 1];
162 int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
163 int obj_created[BINDER_STAT_COUNT];
164 int obj_deleted[BINDER_STAT_COUNT];
167 static struct binder_stats binder_stats;
169 static inline void binder_stats_deleted(enum binder_stat_types type)
171 binder_stats.obj_deleted[type]++;
174 static inline void binder_stats_created(enum binder_stat_types type)
176 binder_stats.obj_created[type]++;
179 struct binder_transaction_log_entry {
191 struct binder_transaction_log {
194 struct binder_transaction_log_entry entry[32];
196 static struct binder_transaction_log binder_transaction_log;
197 static struct binder_transaction_log binder_transaction_log_failed;
199 static struct binder_transaction_log_entry *binder_transaction_log_add(
200 struct binder_transaction_log *log)
202 struct binder_transaction_log_entry *e;
204 e = &log->entry[log->next];
205 memset(e, 0, sizeof(*e));
207 if (log->next == ARRAY_SIZE(log->entry)) {
215 struct list_head entry;
217 BINDER_WORK_TRANSACTION = 1,
218 BINDER_WORK_TRANSACTION_COMPLETE,
220 BINDER_WORK_DEAD_BINDER,
221 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
222 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
228 struct binder_work work;
230 struct rb_node rb_node;
231 struct hlist_node dead_node;
233 struct binder_proc *proc;
234 struct hlist_head refs;
235 int internal_strong_refs;
237 int local_strong_refs;
238 binder_uintptr_t ptr;
239 binder_uintptr_t cookie;
240 unsigned has_strong_ref:1;
241 unsigned pending_strong_ref:1;
242 unsigned has_weak_ref:1;
243 unsigned pending_weak_ref:1;
244 unsigned has_async_transaction:1;
245 unsigned accept_fds:1;
246 unsigned min_priority:8;
247 struct list_head async_todo;
250 struct binder_ref_death {
251 struct binder_work work;
252 binder_uintptr_t cookie;
256 /* Lookups needed: */
257 /* node + proc => ref (transaction) */
258 /* desc + proc => ref (transaction, inc/dec ref) */
259 /* node => refs + procs (proc exit) */
261 struct rb_node rb_node_desc;
262 struct rb_node rb_node_node;
263 struct hlist_node node_entry;
264 struct binder_proc *proc;
265 struct binder_node *node;
269 struct binder_ref_death *death;
272 struct binder_buffer {
273 struct list_head entry; /* free and allocated entries by address */
274 struct rb_node rb_node; /* free entry by size or allocated entry */
277 unsigned allow_user_free:1;
278 unsigned async_transaction:1;
279 unsigned debug_id:29;
281 struct binder_transaction *transaction;
283 struct binder_node *target_node;
289 enum binder_deferred_state {
290 BINDER_DEFERRED_PUT_FILES = 0x01,
291 BINDER_DEFERRED_FLUSH = 0x02,
292 BINDER_DEFERRED_RELEASE = 0x04,
296 struct hlist_node proc_node;
297 struct rb_root threads;
298 struct rb_root nodes;
299 struct rb_root refs_by_desc;
300 struct rb_root refs_by_node;
302 struct vm_area_struct *vma;
303 struct mm_struct *vma_vm_mm;
304 struct task_struct *tsk;
305 struct files_struct *files;
306 struct hlist_node deferred_work_node;
309 ptrdiff_t user_buffer_offset;
311 struct list_head buffers;
312 struct rb_root free_buffers;
313 struct rb_root allocated_buffers;
314 size_t free_async_space;
318 uint32_t buffer_free;
319 struct list_head todo;
320 wait_queue_head_t wait;
321 struct binder_stats stats;
322 struct list_head delivered_death;
324 int requested_threads;
325 int requested_threads_started;
327 long default_priority;
328 struct dentry *debugfs_entry;
332 BINDER_LOOPER_STATE_REGISTERED = 0x01,
333 BINDER_LOOPER_STATE_ENTERED = 0x02,
334 BINDER_LOOPER_STATE_EXITED = 0x04,
335 BINDER_LOOPER_STATE_INVALID = 0x08,
336 BINDER_LOOPER_STATE_WAITING = 0x10,
337 BINDER_LOOPER_STATE_NEED_RETURN = 0x20
340 struct binder_thread {
341 struct binder_proc *proc;
342 struct rb_node rb_node;
345 struct binder_transaction *transaction_stack;
346 struct list_head todo;
347 uint32_t return_error; /* Write failed, return error code in read buf */
348 uint32_t return_error2; /* Write failed, return error code in read */
349 /* buffer. Used when sending a reply to a dead process that */
350 /* we are also waiting on */
351 wait_queue_head_t wait;
352 struct binder_stats stats;
355 struct binder_transaction {
357 struct binder_work work;
358 struct binder_thread *from;
359 struct binder_transaction *from_parent;
360 struct binder_proc *to_proc;
361 struct binder_thread *to_thread;
362 struct binder_transaction *to_parent;
363 unsigned need_reply:1;
364 /* unsigned is_dead:1; */ /* not used at the moment */
366 struct binder_buffer *buffer;
375 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
377 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
379 struct files_struct *files = proc->files;
380 unsigned long rlim_cur;
386 if (!lock_task_sighand(proc->tsk, &irqs))
389 rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
390 unlock_task_sighand(proc->tsk, &irqs);
392 return __alloc_fd(files, 0, rlim_cur, flags);
396 * copied from fd_install
398 static void task_fd_install(
399 struct binder_proc *proc, unsigned int fd, struct file *file)
402 __fd_install(proc->files, fd, file);
406 * copied from sys_close
408 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
412 if (proc->files == NULL)
415 retval = __close_fd(proc->files, fd);
416 /* can't restart close syscall because file table entry was cleared */
417 if (unlikely(retval == -ERESTARTSYS ||
418 retval == -ERESTARTNOINTR ||
419 retval == -ERESTARTNOHAND ||
420 retval == -ERESTART_RESTARTBLOCK))
426 static inline void binder_lock(const char *tag)
428 trace_binder_lock(tag);
429 mutex_lock(&binder_main_lock);
430 trace_binder_locked(tag);
433 static inline void binder_unlock(const char *tag)
435 trace_binder_unlock(tag);
436 mutex_unlock(&binder_main_lock);
439 static void binder_set_nice(long nice)
443 if (can_nice(current, nice)) {
444 set_user_nice(current, nice);
447 min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
448 binder_debug(BINDER_DEBUG_PRIORITY_CAP,
449 "%d: nice value %ld not allowed use %ld instead\n",
450 current->pid, nice, min_nice);
451 set_user_nice(current, min_nice);
452 if (min_nice <= MAX_NICE)
454 binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
457 static size_t binder_buffer_size(struct binder_proc *proc,
458 struct binder_buffer *buffer)
460 if (list_is_last(&buffer->entry, &proc->buffers))
461 return proc->buffer + proc->buffer_size - (void *)buffer->data;
462 return (size_t)list_entry(buffer->entry.next,
463 struct binder_buffer, entry) - (size_t)buffer->data;
466 static void binder_insert_free_buffer(struct binder_proc *proc,
467 struct binder_buffer *new_buffer)
469 struct rb_node **p = &proc->free_buffers.rb_node;
470 struct rb_node *parent = NULL;
471 struct binder_buffer *buffer;
473 size_t new_buffer_size;
475 BUG_ON(!new_buffer->free);
477 new_buffer_size = binder_buffer_size(proc, new_buffer);
479 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
480 "%d: add free buffer, size %zd, at %p\n",
481 proc->pid, new_buffer_size, new_buffer);
485 buffer = rb_entry(parent, struct binder_buffer, rb_node);
486 BUG_ON(!buffer->free);
488 buffer_size = binder_buffer_size(proc, buffer);
490 if (new_buffer_size < buffer_size)
491 p = &parent->rb_left;
493 p = &parent->rb_right;
495 rb_link_node(&new_buffer->rb_node, parent, p);
496 rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
499 static void binder_insert_allocated_buffer(struct binder_proc *proc,
500 struct binder_buffer *new_buffer)
502 struct rb_node **p = &proc->allocated_buffers.rb_node;
503 struct rb_node *parent = NULL;
504 struct binder_buffer *buffer;
506 BUG_ON(new_buffer->free);
510 buffer = rb_entry(parent, struct binder_buffer, rb_node);
511 BUG_ON(buffer->free);
513 if (new_buffer < buffer)
514 p = &parent->rb_left;
515 else if (new_buffer > buffer)
516 p = &parent->rb_right;
520 rb_link_node(&new_buffer->rb_node, parent, p);
521 rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
524 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
527 struct rb_node *n = proc->allocated_buffers.rb_node;
528 struct binder_buffer *buffer;
529 struct binder_buffer *kern_ptr;
531 kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
532 - offsetof(struct binder_buffer, data));
535 buffer = rb_entry(n, struct binder_buffer, rb_node);
536 BUG_ON(buffer->free);
538 if (kern_ptr < buffer)
540 else if (kern_ptr > buffer)
548 static int binder_update_page_range(struct binder_proc *proc, int allocate,
549 void *start, void *end,
550 struct vm_area_struct *vma)
553 unsigned long user_page_addr;
555 struct mm_struct *mm;
557 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
558 "%d: %s pages %p-%p\n", proc->pid,
559 allocate ? "allocate" : "free", start, end);
564 trace_binder_update_page_range(proc, allocate, start, end);
569 mm = get_task_mm(proc->tsk);
572 down_write(&mm->mmap_sem);
574 if (vma && mm != proc->vma_vm_mm) {
575 pr_err("%d: vma mm and task mm mismatch\n",
585 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
590 for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
593 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
596 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
598 pr_err("%d: binder_alloc_buf failed for page at %p\n",
599 proc->pid, page_addr);
600 goto err_alloc_page_failed;
602 ret = map_kernel_range_noflush((unsigned long)page_addr,
603 PAGE_SIZE, PAGE_KERNEL, page);
604 flush_cache_vmap((unsigned long)page_addr,
605 (unsigned long)page_addr + PAGE_SIZE);
607 pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
608 proc->pid, page_addr);
609 goto err_map_kernel_failed;
612 (uintptr_t)page_addr + proc->user_buffer_offset;
613 ret = vm_insert_page(vma, user_page_addr, page[0]);
615 pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
616 proc->pid, user_page_addr);
617 goto err_vm_insert_page_failed;
619 /* vm_insert_page does not seem to increment the refcount */
622 up_write(&mm->mmap_sem);
628 for (page_addr = end - PAGE_SIZE; page_addr >= start;
629 page_addr -= PAGE_SIZE) {
630 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
632 zap_page_range(vma, (uintptr_t)page_addr +
633 proc->user_buffer_offset, PAGE_SIZE, NULL);
634 err_vm_insert_page_failed:
635 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
636 err_map_kernel_failed:
639 err_alloc_page_failed:
644 up_write(&mm->mmap_sem);
650 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
652 size_t offsets_size, int is_async)
654 struct rb_node *n = proc->free_buffers.rb_node;
655 struct binder_buffer *buffer;
657 struct rb_node *best_fit = NULL;
662 if (proc->vma == NULL) {
663 pr_err("%d: binder_alloc_buf, no vma\n",
668 size = ALIGN(data_size, sizeof(void *)) +
669 ALIGN(offsets_size, sizeof(void *));
671 if (size < data_size || size < offsets_size) {
672 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
673 proc->pid, data_size, offsets_size);
678 proc->free_async_space < size + sizeof(struct binder_buffer)) {
679 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
680 "%d: binder_alloc_buf size %zd failed, no async space left\n",
686 buffer = rb_entry(n, struct binder_buffer, rb_node);
687 BUG_ON(!buffer->free);
688 buffer_size = binder_buffer_size(proc, buffer);
690 if (size < buffer_size) {
693 } else if (size > buffer_size)
700 if (best_fit == NULL) {
701 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
706 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
707 buffer_size = binder_buffer_size(proc, buffer);
710 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
711 "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
712 proc->pid, size, buffer, buffer_size);
715 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
717 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
718 buffer_size = size; /* no room for other buffers */
720 buffer_size = size + sizeof(struct binder_buffer);
723 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
724 if (end_page_addr > has_page_addr)
725 end_page_addr = has_page_addr;
726 if (binder_update_page_range(proc, 1,
727 (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
730 rb_erase(best_fit, &proc->free_buffers);
732 binder_insert_allocated_buffer(proc, buffer);
733 if (buffer_size != size) {
734 struct binder_buffer *new_buffer = (void *)buffer->data + size;
736 list_add(&new_buffer->entry, &buffer->entry);
737 new_buffer->free = 1;
738 binder_insert_free_buffer(proc, new_buffer);
740 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
741 "%d: binder_alloc_buf size %zd got %p\n",
742 proc->pid, size, buffer);
743 buffer->data_size = data_size;
744 buffer->offsets_size = offsets_size;
745 buffer->async_transaction = is_async;
747 proc->free_async_space -= size + sizeof(struct binder_buffer);
748 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
749 "%d: binder_alloc_buf size %zd async free %zd\n",
750 proc->pid, size, proc->free_async_space);
756 static void *buffer_start_page(struct binder_buffer *buffer)
758 return (void *)((uintptr_t)buffer & PAGE_MASK);
761 static void *buffer_end_page(struct binder_buffer *buffer)
763 return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
766 static void binder_delete_free_buffer(struct binder_proc *proc,
767 struct binder_buffer *buffer)
769 struct binder_buffer *prev, *next = NULL;
770 int free_page_end = 1;
771 int free_page_start = 1;
773 BUG_ON(proc->buffers.next == &buffer->entry);
774 prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
776 if (buffer_end_page(prev) == buffer_start_page(buffer)) {
778 if (buffer_end_page(prev) == buffer_end_page(buffer))
780 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
781 "%d: merge free, buffer %p share page with %p\n",
782 proc->pid, buffer, prev);
785 if (!list_is_last(&buffer->entry, &proc->buffers)) {
786 next = list_entry(buffer->entry.next,
787 struct binder_buffer, entry);
788 if (buffer_start_page(next) == buffer_end_page(buffer)) {
790 if (buffer_start_page(next) ==
791 buffer_start_page(buffer))
793 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
794 "%d: merge free, buffer %p share page with %p\n",
795 proc->pid, buffer, prev);
798 list_del(&buffer->entry);
799 if (free_page_start || free_page_end) {
800 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
801 "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
802 proc->pid, buffer, free_page_start ? "" : " end",
803 free_page_end ? "" : " start", prev, next);
804 binder_update_page_range(proc, 0, free_page_start ?
805 buffer_start_page(buffer) : buffer_end_page(buffer),
806 (free_page_end ? buffer_end_page(buffer) :
807 buffer_start_page(buffer)) + PAGE_SIZE, NULL);
811 static void binder_free_buf(struct binder_proc *proc,
812 struct binder_buffer *buffer)
814 size_t size, buffer_size;
816 buffer_size = binder_buffer_size(proc, buffer);
818 size = ALIGN(buffer->data_size, sizeof(void *)) +
819 ALIGN(buffer->offsets_size, sizeof(void *));
821 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
822 "%d: binder_free_buf %p size %zd buffer_size %zd\n",
823 proc->pid, buffer, size, buffer_size);
825 BUG_ON(buffer->free);
826 BUG_ON(size > buffer_size);
827 BUG_ON(buffer->transaction != NULL);
828 BUG_ON((void *)buffer < proc->buffer);
829 BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
831 if (buffer->async_transaction) {
832 proc->free_async_space += size + sizeof(struct binder_buffer);
834 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
835 "%d: binder_free_buf size %zd async free %zd\n",
836 proc->pid, size, proc->free_async_space);
839 binder_update_page_range(proc, 0,
840 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
841 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
843 rb_erase(&buffer->rb_node, &proc->allocated_buffers);
845 if (!list_is_last(&buffer->entry, &proc->buffers)) {
846 struct binder_buffer *next = list_entry(buffer->entry.next,
847 struct binder_buffer, entry);
850 rb_erase(&next->rb_node, &proc->free_buffers);
851 binder_delete_free_buffer(proc, next);
854 if (proc->buffers.next != &buffer->entry) {
855 struct binder_buffer *prev = list_entry(buffer->entry.prev,
856 struct binder_buffer, entry);
859 binder_delete_free_buffer(proc, buffer);
860 rb_erase(&prev->rb_node, &proc->free_buffers);
864 binder_insert_free_buffer(proc, buffer);
867 static struct binder_node *binder_get_node(struct binder_proc *proc,
868 binder_uintptr_t ptr)
870 struct rb_node *n = proc->nodes.rb_node;
871 struct binder_node *node;
874 node = rb_entry(n, struct binder_node, rb_node);
878 else if (ptr > node->ptr)
886 static struct binder_node *binder_new_node(struct binder_proc *proc,
887 binder_uintptr_t ptr,
888 binder_uintptr_t cookie)
890 struct rb_node **p = &proc->nodes.rb_node;
891 struct rb_node *parent = NULL;
892 struct binder_node *node;
896 node = rb_entry(parent, struct binder_node, rb_node);
900 else if (ptr > node->ptr)
906 node = kzalloc(sizeof(*node), GFP_KERNEL);
909 binder_stats_created(BINDER_STAT_NODE);
910 rb_link_node(&node->rb_node, parent, p);
911 rb_insert_color(&node->rb_node, &proc->nodes);
912 node->debug_id = ++binder_last_id;
915 node->cookie = cookie;
916 node->work.type = BINDER_WORK_NODE;
917 INIT_LIST_HEAD(&node->work.entry);
918 INIT_LIST_HEAD(&node->async_todo);
919 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
920 "%d:%d node %d u%016llx c%016llx created\n",
921 proc->pid, current->pid, node->debug_id,
922 (u64)node->ptr, (u64)node->cookie);
926 static int binder_inc_node(struct binder_node *node, int strong, int internal,
927 struct list_head *target_list)
931 if (target_list == NULL &&
932 node->internal_strong_refs == 0 &&
933 !(node == binder_context_mgr_node &&
934 node->has_strong_ref)) {
935 pr_err("invalid inc strong node for %d\n",
939 node->internal_strong_refs++;
941 node->local_strong_refs++;
942 if (!node->has_strong_ref && target_list) {
943 list_del_init(&node->work.entry);
944 list_add_tail(&node->work.entry, target_list);
948 node->local_weak_refs++;
949 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
950 if (target_list == NULL) {
951 pr_err("invalid inc weak node for %d\n",
955 list_add_tail(&node->work.entry, target_list);
961 static int binder_dec_node(struct binder_node *node, int strong, int internal)
965 node->internal_strong_refs--;
967 node->local_strong_refs--;
968 if (node->local_strong_refs || node->internal_strong_refs)
972 node->local_weak_refs--;
973 if (node->local_weak_refs || !hlist_empty(&node->refs))
976 if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
977 if (list_empty(&node->work.entry)) {
978 list_add_tail(&node->work.entry, &node->proc->todo);
979 wake_up_interruptible(&node->proc->wait);
982 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
983 !node->local_weak_refs) {
984 list_del_init(&node->work.entry);
986 rb_erase(&node->rb_node, &node->proc->nodes);
987 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
988 "refless node %d deleted\n",
991 hlist_del(&node->dead_node);
992 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
993 "dead node %d deleted\n",
997 binder_stats_deleted(BINDER_STAT_NODE);
1005 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1006 u32 desc, bool need_strong_ref)
1008 struct rb_node *n = proc->refs_by_desc.rb_node;
1009 struct binder_ref *ref;
1012 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1014 if (desc < ref->desc) {
1016 } else if (desc > ref->desc) {
1018 } else if (need_strong_ref && !ref->strong) {
1019 binder_user_error("tried to use weak ref as strong ref\n");
1028 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1029 struct binder_node *node)
1032 struct rb_node **p = &proc->refs_by_node.rb_node;
1033 struct rb_node *parent = NULL;
1034 struct binder_ref *ref, *new_ref;
1038 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1040 if (node < ref->node)
1042 else if (node > ref->node)
1043 p = &(*p)->rb_right;
1047 new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1048 if (new_ref == NULL)
1050 binder_stats_created(BINDER_STAT_REF);
1051 new_ref->debug_id = ++binder_last_id;
1052 new_ref->proc = proc;
1053 new_ref->node = node;
1054 rb_link_node(&new_ref->rb_node_node, parent, p);
1055 rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1057 new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1058 for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1059 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1060 if (ref->desc > new_ref->desc)
1062 new_ref->desc = ref->desc + 1;
1065 p = &proc->refs_by_desc.rb_node;
1068 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1070 if (new_ref->desc < ref->desc)
1072 else if (new_ref->desc > ref->desc)
1073 p = &(*p)->rb_right;
1077 rb_link_node(&new_ref->rb_node_desc, parent, p);
1078 rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1080 hlist_add_head(&new_ref->node_entry, &node->refs);
1082 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1083 "%d new ref %d desc %d for node %d\n",
1084 proc->pid, new_ref->debug_id, new_ref->desc,
1087 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1088 "%d new ref %d desc %d for dead node\n",
1089 proc->pid, new_ref->debug_id, new_ref->desc);
1094 static void binder_delete_ref(struct binder_ref *ref)
1096 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1097 "%d delete ref %d desc %d for node %d\n",
1098 ref->proc->pid, ref->debug_id, ref->desc,
1099 ref->node->debug_id);
1101 rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1102 rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1104 binder_dec_node(ref->node, 1, 1);
1105 hlist_del(&ref->node_entry);
1106 binder_dec_node(ref->node, 0, 1);
1108 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1109 "%d delete ref %d desc %d has death notification\n",
1110 ref->proc->pid, ref->debug_id, ref->desc);
1111 list_del(&ref->death->work.entry);
1113 binder_stats_deleted(BINDER_STAT_DEATH);
1116 binder_stats_deleted(BINDER_STAT_REF);
1119 static int binder_inc_ref(struct binder_ref *ref, int strong,
1120 struct list_head *target_list)
1125 if (ref->strong == 0) {
1126 ret = binder_inc_node(ref->node, 1, 1, target_list);
1132 if (ref->weak == 0) {
1133 ret = binder_inc_node(ref->node, 0, 1, target_list);
1143 static int binder_dec_ref(struct binder_ref *ref, int strong)
1146 if (ref->strong == 0) {
1147 binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1148 ref->proc->pid, ref->debug_id,
1149 ref->desc, ref->strong, ref->weak);
1153 if (ref->strong == 0) {
1156 ret = binder_dec_node(ref->node, strong, 1);
1161 if (ref->weak == 0) {
1162 binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1163 ref->proc->pid, ref->debug_id,
1164 ref->desc, ref->strong, ref->weak);
1169 if (ref->strong == 0 && ref->weak == 0)
1170 binder_delete_ref(ref);
1174 static void binder_pop_transaction(struct binder_thread *target_thread,
1175 struct binder_transaction *t)
1177 if (target_thread) {
1178 BUG_ON(target_thread->transaction_stack != t);
1179 BUG_ON(target_thread->transaction_stack->from != target_thread);
1180 target_thread->transaction_stack =
1181 target_thread->transaction_stack->from_parent;
1186 t->buffer->transaction = NULL;
1188 binder_stats_deleted(BINDER_STAT_TRANSACTION);
1191 static void binder_send_failed_reply(struct binder_transaction *t,
1192 uint32_t error_code)
1194 struct binder_thread *target_thread;
1195 struct binder_transaction *next;
1197 BUG_ON(t->flags & TF_ONE_WAY);
1199 target_thread = t->from;
1200 if (target_thread) {
1201 if (target_thread->return_error != BR_OK &&
1202 target_thread->return_error2 == BR_OK) {
1203 target_thread->return_error2 =
1204 target_thread->return_error;
1205 target_thread->return_error = BR_OK;
1207 if (target_thread->return_error == BR_OK) {
1208 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1209 "send failed reply for transaction %d to %d:%d\n",
1211 target_thread->proc->pid,
1212 target_thread->pid);
1214 binder_pop_transaction(target_thread, t);
1215 target_thread->return_error = error_code;
1216 wake_up_interruptible(&target_thread->wait);
1218 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1219 target_thread->proc->pid,
1221 target_thread->return_error);
1225 next = t->from_parent;
1227 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1228 "send failed reply for transaction %d, target dead\n",
1231 binder_pop_transaction(target_thread, t);
1233 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1234 "reply failed, no target thread at root\n");
1238 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1239 "reply failed, no target thread -- retry %d\n",
1244 static void binder_transaction_buffer_release(struct binder_proc *proc,
1245 struct binder_buffer *buffer,
1246 binder_size_t *failed_at)
1248 binder_size_t *offp, *off_end;
1249 int debug_id = buffer->debug_id;
1251 binder_debug(BINDER_DEBUG_TRANSACTION,
1252 "%d buffer release %d, size %zd-%zd, failed at %p\n",
1253 proc->pid, buffer->debug_id,
1254 buffer->data_size, buffer->offsets_size, failed_at);
1256 if (buffer->target_node)
1257 binder_dec_node(buffer->target_node, 1, 0);
1259 offp = (binder_size_t *)(buffer->data +
1260 ALIGN(buffer->data_size, sizeof(void *)));
1262 off_end = failed_at;
1264 off_end = (void *)offp + buffer->offsets_size;
1265 for (; offp < off_end; offp++) {
1266 struct flat_binder_object *fp;
1268 if (*offp > buffer->data_size - sizeof(*fp) ||
1269 buffer->data_size < sizeof(*fp) ||
1270 !IS_ALIGNED(*offp, sizeof(u32))) {
1271 pr_err("transaction release %d bad offset %lld, size %zd\n",
1272 debug_id, (u64)*offp, buffer->data_size);
1275 fp = (struct flat_binder_object *)(buffer->data + *offp);
1277 case BINDER_TYPE_BINDER:
1278 case BINDER_TYPE_WEAK_BINDER: {
1279 struct binder_node *node = binder_get_node(proc, fp->binder);
1282 pr_err("transaction release %d bad node %016llx\n",
1283 debug_id, (u64)fp->binder);
1286 binder_debug(BINDER_DEBUG_TRANSACTION,
1287 " node %d u%016llx\n",
1288 node->debug_id, (u64)node->ptr);
1289 binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1291 case BINDER_TYPE_HANDLE:
1292 case BINDER_TYPE_WEAK_HANDLE: {
1293 struct binder_ref *ref;
1295 ref = binder_get_ref(proc, fp->handle,
1296 fp->type == BINDER_TYPE_HANDLE);
1299 pr_err("transaction release %d bad handle %d\n",
1300 debug_id, fp->handle);
1303 binder_debug(BINDER_DEBUG_TRANSACTION,
1304 " ref %d desc %d (node %d)\n",
1305 ref->debug_id, ref->desc, ref->node->debug_id);
1306 binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1309 case BINDER_TYPE_FD:
1310 binder_debug(BINDER_DEBUG_TRANSACTION,
1311 " fd %d\n", fp->handle);
1313 task_close_fd(proc, fp->handle);
1317 pr_err("transaction release %d bad object type %x\n",
1318 debug_id, fp->type);
1324 static void binder_transaction(struct binder_proc *proc,
1325 struct binder_thread *thread,
1326 struct binder_transaction_data *tr, int reply)
1328 struct binder_transaction *t;
1329 struct binder_work *tcomplete;
1330 binder_size_t *offp, *off_end;
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;
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;
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;
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;
1366 goto err_bad_call_stack;
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;
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;
1382 target_thread = NULL;
1383 goto err_dead_binder;
1385 target_proc = target_thread->proc;
1387 if (tr->target.handle) {
1388 struct binder_ref *ref;
1390 ref = binder_get_ref(proc, tr->target.handle, true);
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;
1397 target_node = ref->node;
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;
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;
1411 if (security_binder_transaction(proc->tsk,
1412 target_proc->tsk) < 0) {
1413 return_error = BR_FAILED_REPLY;
1414 goto err_invalid_target_handle;
1416 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1417 struct binder_transaction *tmp;
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,
1425 tmp->to_thread->pid : 0);
1426 return_error = BR_FAILED_REPLY;
1427 goto err_bad_call_stack;
1430 if (tmp->from && tmp->from->proc == target_proc)
1431 target_thread = tmp->from;
1432 tmp = tmp->from_parent;
1436 if (target_thread) {
1437 e->to_thread = target_thread->pid;
1438 target_list = &target_thread->todo;
1439 target_wait = &target_thread->wait;
1441 target_list = &target_proc->todo;
1442 target_wait = &target_proc->wait;
1444 e->to_proc = target_proc->pid;
1446 /* TODO: reuse incoming transaction for reply */
1447 t = kzalloc(sizeof(*t), GFP_KERNEL);
1449 return_error = BR_FAILED_REPLY;
1450 goto err_alloc_t_failed;
1452 binder_stats_created(BINDER_STAT_TRANSACTION);
1454 tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1455 if (tcomplete == NULL) {
1456 return_error = BR_FAILED_REPLY;
1457 goto err_alloc_tcomplete_failed;
1459 binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1461 t->debug_id = ++binder_last_id;
1462 e->debug_id = t->debug_id;
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);
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);
1481 if (!reply && !(tr->flags & TF_ONE_WAY))
1485 t->sender_euid = task_euid(proc->tsk);
1486 t->to_proc = target_proc;
1487 t->to_thread = target_thread;
1489 t->flags = tr->flags;
1490 t->priority = task_nice(current);
1492 trace_binder_transaction(reply, t, target_node);
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;
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);
1506 binder_inc_node(target_node, 1, 0, NULL);
1508 offp = (binder_size_t *)(t->buffer->data +
1509 ALIGN(tr->data_size, sizeof(void *)));
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;
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;
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;
1531 off_end = (void *)offp + tr->offsets_size;
1532 for (; offp < off_end; offp++) {
1533 struct flat_binder_object *fp;
1535 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1536 t->buffer->data_size < sizeof(*fp) ||
1537 !IS_ALIGNED(*offp, sizeof(u32))) {
1538 binder_user_error("%d:%d got transaction with invalid offset, %lld\n",
1539 proc->pid, thread->pid, (u64)*offp);
1540 return_error = BR_FAILED_REPLY;
1541 goto err_bad_offset;
1543 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1545 case BINDER_TYPE_BINDER:
1546 case BINDER_TYPE_WEAK_BINDER: {
1547 struct binder_ref *ref;
1548 struct binder_node *node = binder_get_node(proc, fp->binder);
1551 node = binder_new_node(proc, fp->binder, fp->cookie);
1553 return_error = BR_FAILED_REPLY;
1554 goto err_binder_new_node_failed;
1556 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1557 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1559 if (fp->cookie != node->cookie) {
1560 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1561 proc->pid, thread->pid,
1562 (u64)fp->binder, node->debug_id,
1563 (u64)fp->cookie, (u64)node->cookie);
1564 return_error = BR_FAILED_REPLY;
1565 goto err_binder_get_ref_for_node_failed;
1567 if (security_binder_transfer_binder(proc->tsk,
1568 target_proc->tsk)) {
1569 return_error = BR_FAILED_REPLY;
1570 goto err_binder_get_ref_for_node_failed;
1572 ref = binder_get_ref_for_node(target_proc, node);
1574 return_error = BR_FAILED_REPLY;
1575 goto err_binder_get_ref_for_node_failed;
1577 if (fp->type == BINDER_TYPE_BINDER)
1578 fp->type = BINDER_TYPE_HANDLE;
1580 fp->type = BINDER_TYPE_WEAK_HANDLE;
1582 fp->handle = ref->desc;
1584 binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1587 trace_binder_transaction_node_to_ref(t, node, ref);
1588 binder_debug(BINDER_DEBUG_TRANSACTION,
1589 " node %d u%016llx -> ref %d desc %d\n",
1590 node->debug_id, (u64)node->ptr,
1591 ref->debug_id, ref->desc);
1593 case BINDER_TYPE_HANDLE:
1594 case BINDER_TYPE_WEAK_HANDLE: {
1595 struct binder_ref *ref;
1597 ref = binder_get_ref(proc, fp->handle,
1598 fp->type == BINDER_TYPE_HANDLE);
1601 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1603 thread->pid, fp->handle);
1604 return_error = BR_FAILED_REPLY;
1605 goto err_binder_get_ref_failed;
1607 if (security_binder_transfer_binder(proc->tsk,
1608 target_proc->tsk)) {
1609 return_error = BR_FAILED_REPLY;
1610 goto err_binder_get_ref_failed;
1612 if (ref->node->proc == target_proc) {
1613 if (fp->type == BINDER_TYPE_HANDLE)
1614 fp->type = BINDER_TYPE_BINDER;
1616 fp->type = BINDER_TYPE_WEAK_BINDER;
1617 fp->binder = ref->node->ptr;
1618 fp->cookie = ref->node->cookie;
1619 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1620 trace_binder_transaction_ref_to_node(t, ref);
1621 binder_debug(BINDER_DEBUG_TRANSACTION,
1622 " ref %d desc %d -> node %d u%016llx\n",
1623 ref->debug_id, ref->desc, ref->node->debug_id,
1624 (u64)ref->node->ptr);
1626 struct binder_ref *new_ref;
1628 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1629 if (new_ref == NULL) {
1630 return_error = BR_FAILED_REPLY;
1631 goto err_binder_get_ref_for_node_failed;
1634 fp->handle = new_ref->desc;
1636 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1637 trace_binder_transaction_ref_to_ref(t, ref,
1639 binder_debug(BINDER_DEBUG_TRANSACTION,
1640 " ref %d desc %d -> ref %d desc %d (node %d)\n",
1641 ref->debug_id, ref->desc, new_ref->debug_id,
1642 new_ref->desc, ref->node->debug_id);
1646 case BINDER_TYPE_FD: {
1651 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1652 binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1653 proc->pid, thread->pid, fp->handle);
1654 return_error = BR_FAILED_REPLY;
1655 goto err_fd_not_allowed;
1657 } else if (!target_node->accept_fds) {
1658 binder_user_error("%d:%d got transaction 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;
1664 file = fget(fp->handle);
1666 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1667 proc->pid, thread->pid, fp->handle);
1668 return_error = BR_FAILED_REPLY;
1669 goto err_fget_failed;
1671 if (security_binder_transfer_file(proc->tsk,
1675 return_error = BR_FAILED_REPLY;
1676 goto err_get_unused_fd_failed;
1678 target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1679 if (target_fd < 0) {
1681 return_error = BR_FAILED_REPLY;
1682 goto err_get_unused_fd_failed;
1684 task_fd_install(target_proc, target_fd, file);
1685 trace_binder_transaction_fd(t, fp->handle, target_fd);
1686 binder_debug(BINDER_DEBUG_TRANSACTION,
1687 " fd %d -> %d\n", fp->handle, target_fd);
1690 fp->handle = target_fd;
1694 binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1695 proc->pid, thread->pid, fp->type);
1696 return_error = BR_FAILED_REPLY;
1697 goto err_bad_object_type;
1701 BUG_ON(t->buffer->async_transaction != 0);
1702 binder_pop_transaction(target_thread, in_reply_to);
1703 } else if (!(t->flags & TF_ONE_WAY)) {
1704 BUG_ON(t->buffer->async_transaction != 0);
1706 t->from_parent = thread->transaction_stack;
1707 thread->transaction_stack = t;
1709 BUG_ON(target_node == NULL);
1710 BUG_ON(t->buffer->async_transaction != 1);
1711 if (target_node->has_async_transaction) {
1712 target_list = &target_node->async_todo;
1715 target_node->has_async_transaction = 1;
1717 t->work.type = BINDER_WORK_TRANSACTION;
1718 list_add_tail(&t->work.entry, target_list);
1719 tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1720 list_add_tail(&tcomplete->entry, &thread->todo);
1722 wake_up_interruptible(target_wait);
1725 err_get_unused_fd_failed:
1728 err_binder_get_ref_for_node_failed:
1729 err_binder_get_ref_failed:
1730 err_binder_new_node_failed:
1731 err_bad_object_type:
1733 err_copy_data_failed:
1734 trace_binder_transaction_failed_buffer_release(t->buffer);
1735 binder_transaction_buffer_release(target_proc, t->buffer, offp);
1736 t->buffer->transaction = NULL;
1737 binder_free_buf(target_proc, t->buffer);
1738 err_binder_alloc_buf_failed:
1740 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1741 err_alloc_tcomplete_failed:
1743 binder_stats_deleted(BINDER_STAT_TRANSACTION);
1746 err_empty_call_stack:
1748 err_invalid_target_handle:
1749 err_no_context_mgr_node:
1750 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1751 "%d:%d transaction failed %d, size %lld-%lld\n",
1752 proc->pid, thread->pid, return_error,
1753 (u64)tr->data_size, (u64)tr->offsets_size);
1756 struct binder_transaction_log_entry *fe;
1758 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1762 BUG_ON(thread->return_error != BR_OK);
1764 thread->return_error = BR_TRANSACTION_COMPLETE;
1765 binder_send_failed_reply(in_reply_to, return_error);
1767 thread->return_error = return_error;
1770 static int binder_thread_write(struct binder_proc *proc,
1771 struct binder_thread *thread,
1772 binder_uintptr_t binder_buffer, size_t size,
1773 binder_size_t *consumed)
1776 void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
1777 void __user *ptr = buffer + *consumed;
1778 void __user *end = buffer + size;
1780 while (ptr < end && thread->return_error == BR_OK) {
1781 if (get_user(cmd, (uint32_t __user *)ptr))
1783 ptr += sizeof(uint32_t);
1784 trace_binder_command(cmd);
1785 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1786 binder_stats.bc[_IOC_NR(cmd)]++;
1787 proc->stats.bc[_IOC_NR(cmd)]++;
1788 thread->stats.bc[_IOC_NR(cmd)]++;
1796 struct binder_ref *ref;
1797 const char *debug_string;
1799 if (get_user(target, (uint32_t __user *)ptr))
1801 ptr += sizeof(uint32_t);
1802 if (target == 0 && binder_context_mgr_node &&
1803 (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1804 ref = binder_get_ref_for_node(proc,
1805 binder_context_mgr_node);
1806 if (ref->desc != target) {
1807 binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1808 proc->pid, thread->pid,
1812 ref = binder_get_ref(proc, target,
1813 cmd == BC_ACQUIRE ||
1816 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1817 proc->pid, thread->pid, target);
1822 debug_string = "IncRefs";
1823 binder_inc_ref(ref, 0, NULL);
1826 debug_string = "Acquire";
1827 binder_inc_ref(ref, 1, NULL);
1830 debug_string = "Release";
1831 binder_dec_ref(ref, 1);
1835 debug_string = "DecRefs";
1836 binder_dec_ref(ref, 0);
1839 binder_debug(BINDER_DEBUG_USER_REFS,
1840 "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1841 proc->pid, thread->pid, debug_string, ref->debug_id,
1842 ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1845 case BC_INCREFS_DONE:
1846 case BC_ACQUIRE_DONE: {
1847 binder_uintptr_t node_ptr;
1848 binder_uintptr_t cookie;
1849 struct binder_node *node;
1851 if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
1853 ptr += sizeof(binder_uintptr_t);
1854 if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1856 ptr += sizeof(binder_uintptr_t);
1857 node = binder_get_node(proc, node_ptr);
1859 binder_user_error("%d:%d %s u%016llx no match\n",
1860 proc->pid, thread->pid,
1861 cmd == BC_INCREFS_DONE ?
1867 if (cookie != node->cookie) {
1868 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
1869 proc->pid, thread->pid,
1870 cmd == BC_INCREFS_DONE ?
1871 "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1872 (u64)node_ptr, node->debug_id,
1873 (u64)cookie, (u64)node->cookie);
1876 if (cmd == BC_ACQUIRE_DONE) {
1877 if (node->pending_strong_ref == 0) {
1878 binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1879 proc->pid, thread->pid,
1883 node->pending_strong_ref = 0;
1885 if (node->pending_weak_ref == 0) {
1886 binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1887 proc->pid, thread->pid,
1891 node->pending_weak_ref = 0;
1893 binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1894 binder_debug(BINDER_DEBUG_USER_REFS,
1895 "%d:%d %s node %d ls %d lw %d\n",
1896 proc->pid, thread->pid,
1897 cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1898 node->debug_id, node->local_strong_refs, node->local_weak_refs);
1901 case BC_ATTEMPT_ACQUIRE:
1902 pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1904 case BC_ACQUIRE_RESULT:
1905 pr_err("BC_ACQUIRE_RESULT not supported\n");
1908 case BC_FREE_BUFFER: {
1909 binder_uintptr_t data_ptr;
1910 struct binder_buffer *buffer;
1912 if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
1914 ptr += sizeof(binder_uintptr_t);
1916 buffer = binder_buffer_lookup(proc, data_ptr);
1917 if (buffer == NULL) {
1918 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
1919 proc->pid, thread->pid, (u64)data_ptr);
1922 if (!buffer->allow_user_free) {
1923 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
1924 proc->pid, thread->pid, (u64)data_ptr);
1927 binder_debug(BINDER_DEBUG_FREE_BUFFER,
1928 "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
1929 proc->pid, thread->pid, (u64)data_ptr,
1931 buffer->transaction ? "active" : "finished");
1933 if (buffer->transaction) {
1934 buffer->transaction->buffer = NULL;
1935 buffer->transaction = NULL;
1937 if (buffer->async_transaction && buffer->target_node) {
1938 BUG_ON(!buffer->target_node->has_async_transaction);
1939 if (list_empty(&buffer->target_node->async_todo))
1940 buffer->target_node->has_async_transaction = 0;
1942 list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1944 trace_binder_transaction_buffer_release(buffer);
1945 binder_transaction_buffer_release(proc, buffer, NULL);
1946 binder_free_buf(proc, buffer);
1950 case BC_TRANSACTION:
1952 struct binder_transaction_data tr;
1954 if (copy_from_user(&tr, ptr, sizeof(tr)))
1957 binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1961 case BC_REGISTER_LOOPER:
1962 binder_debug(BINDER_DEBUG_THREADS,
1963 "%d:%d BC_REGISTER_LOOPER\n",
1964 proc->pid, thread->pid);
1965 if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1966 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1967 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1968 proc->pid, thread->pid);
1969 } else if (proc->requested_threads == 0) {
1970 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1971 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1972 proc->pid, thread->pid);
1974 proc->requested_threads--;
1975 proc->requested_threads_started++;
1977 thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1979 case BC_ENTER_LOOPER:
1980 binder_debug(BINDER_DEBUG_THREADS,
1981 "%d:%d BC_ENTER_LOOPER\n",
1982 proc->pid, thread->pid);
1983 if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1984 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1985 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1986 proc->pid, thread->pid);
1988 thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1990 case BC_EXIT_LOOPER:
1991 binder_debug(BINDER_DEBUG_THREADS,
1992 "%d:%d BC_EXIT_LOOPER\n",
1993 proc->pid, thread->pid);
1994 thread->looper |= BINDER_LOOPER_STATE_EXITED;
1997 case BC_REQUEST_DEATH_NOTIFICATION:
1998 case BC_CLEAR_DEATH_NOTIFICATION: {
2000 binder_uintptr_t cookie;
2001 struct binder_ref *ref;
2002 struct binder_ref_death *death;
2004 if (get_user(target, (uint32_t __user *)ptr))
2006 ptr += sizeof(uint32_t);
2007 if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2009 ptr += sizeof(binder_uintptr_t);
2010 ref = binder_get_ref(proc, target, false);
2012 binder_user_error("%d:%d %s invalid ref %d\n",
2013 proc->pid, thread->pid,
2014 cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2015 "BC_REQUEST_DEATH_NOTIFICATION" :
2016 "BC_CLEAR_DEATH_NOTIFICATION",
2021 binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2022 "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
2023 proc->pid, thread->pid,
2024 cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2025 "BC_REQUEST_DEATH_NOTIFICATION" :
2026 "BC_CLEAR_DEATH_NOTIFICATION",
2027 (u64)cookie, ref->debug_id, ref->desc,
2028 ref->strong, ref->weak, ref->node->debug_id);
2030 if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2032 binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2033 proc->pid, thread->pid);
2036 death = kzalloc(sizeof(*death), GFP_KERNEL);
2037 if (death == NULL) {
2038 thread->return_error = BR_ERROR;
2039 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2040 "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2041 proc->pid, thread->pid);
2044 binder_stats_created(BINDER_STAT_DEATH);
2045 INIT_LIST_HEAD(&death->work.entry);
2046 death->cookie = cookie;
2048 if (ref->node->proc == NULL) {
2049 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2050 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2051 list_add_tail(&ref->death->work.entry, &thread->todo);
2053 list_add_tail(&ref->death->work.entry, &proc->todo);
2054 wake_up_interruptible(&proc->wait);
2058 if (ref->death == NULL) {
2059 binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2060 proc->pid, thread->pid);
2064 if (death->cookie != cookie) {
2065 binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2066 proc->pid, thread->pid,
2072 if (list_empty(&death->work.entry)) {
2073 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2074 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2075 list_add_tail(&death->work.entry, &thread->todo);
2077 list_add_tail(&death->work.entry, &proc->todo);
2078 wake_up_interruptible(&proc->wait);
2081 BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2082 death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2086 case BC_DEAD_BINDER_DONE: {
2087 struct binder_work *w;
2088 binder_uintptr_t cookie;
2089 struct binder_ref_death *death = NULL;
2091 if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2094 ptr += sizeof(cookie);
2095 list_for_each_entry(w, &proc->delivered_death, entry) {
2096 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2098 if (tmp_death->cookie == cookie) {
2103 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2104 "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2105 proc->pid, thread->pid, (u64)cookie,
2107 if (death == NULL) {
2108 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2109 proc->pid, thread->pid, (u64)cookie);
2113 list_del_init(&death->work.entry);
2114 if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2115 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2116 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2117 list_add_tail(&death->work.entry, &thread->todo);
2119 list_add_tail(&death->work.entry, &proc->todo);
2120 wake_up_interruptible(&proc->wait);
2126 pr_err("%d:%d unknown command %d\n",
2127 proc->pid, thread->pid, cmd);
2130 *consumed = ptr - buffer;
2135 static void binder_stat_br(struct binder_proc *proc,
2136 struct binder_thread *thread, uint32_t cmd)
2138 trace_binder_return(cmd);
2139 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2140 binder_stats.br[_IOC_NR(cmd)]++;
2141 proc->stats.br[_IOC_NR(cmd)]++;
2142 thread->stats.br[_IOC_NR(cmd)]++;
2146 static int binder_has_proc_work(struct binder_proc *proc,
2147 struct binder_thread *thread)
2149 return !list_empty(&proc->todo) ||
2150 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2153 static int binder_has_thread_work(struct binder_thread *thread)
2155 return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2156 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2159 static int binder_thread_read(struct binder_proc *proc,
2160 struct binder_thread *thread,
2161 binder_uintptr_t binder_buffer, size_t size,
2162 binder_size_t *consumed, int non_block)
2164 void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2165 void __user *ptr = buffer + *consumed;
2166 void __user *end = buffer + size;
2169 int wait_for_proc_work;
2171 if (*consumed == 0) {
2172 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2174 ptr += sizeof(uint32_t);
2178 wait_for_proc_work = thread->transaction_stack == NULL &&
2179 list_empty(&thread->todo);
2181 if (thread->return_error != BR_OK && ptr < end) {
2182 if (thread->return_error2 != BR_OK) {
2183 if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2185 ptr += sizeof(uint32_t);
2186 binder_stat_br(proc, thread, thread->return_error2);
2189 thread->return_error2 = BR_OK;
2191 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2193 ptr += sizeof(uint32_t);
2194 binder_stat_br(proc, thread, thread->return_error);
2195 thread->return_error = BR_OK;
2200 thread->looper |= BINDER_LOOPER_STATE_WAITING;
2201 if (wait_for_proc_work)
2202 proc->ready_threads++;
2204 binder_unlock(__func__);
2206 trace_binder_wait_for_work(wait_for_proc_work,
2207 !!thread->transaction_stack,
2208 !list_empty(&thread->todo));
2209 if (wait_for_proc_work) {
2210 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2211 BINDER_LOOPER_STATE_ENTERED))) {
2212 binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2213 proc->pid, thread->pid, thread->looper);
2214 wait_event_interruptible(binder_user_error_wait,
2215 binder_stop_on_user_error < 2);
2217 binder_set_nice(proc->default_priority);
2219 if (!binder_has_proc_work(proc, thread))
2222 ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2225 if (!binder_has_thread_work(thread))
2228 ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2231 binder_lock(__func__);
2233 if (wait_for_proc_work)
2234 proc->ready_threads--;
2235 thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2242 struct binder_transaction_data tr;
2243 struct binder_work *w;
2244 struct binder_transaction *t = NULL;
2246 if (!list_empty(&thread->todo)) {
2247 w = list_first_entry(&thread->todo, struct binder_work,
2249 } else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2250 w = list_first_entry(&proc->todo, struct binder_work,
2254 if (ptr - buffer == 4 &&
2255 !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2260 if (end - ptr < sizeof(tr) + 4)
2264 case BINDER_WORK_TRANSACTION: {
2265 t = container_of(w, struct binder_transaction, work);
2267 case BINDER_WORK_TRANSACTION_COMPLETE: {
2268 cmd = BR_TRANSACTION_COMPLETE;
2269 if (put_user(cmd, (uint32_t __user *)ptr))
2271 ptr += sizeof(uint32_t);
2273 binder_stat_br(proc, thread, cmd);
2274 binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2275 "%d:%d BR_TRANSACTION_COMPLETE\n",
2276 proc->pid, thread->pid);
2278 list_del(&w->entry);
2280 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2282 case BINDER_WORK_NODE: {
2283 struct binder_node *node = container_of(w, struct binder_node, work);
2284 uint32_t cmd = BR_NOOP;
2285 const char *cmd_name;
2286 int strong = node->internal_strong_refs || node->local_strong_refs;
2287 int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2289 if (weak && !node->has_weak_ref) {
2291 cmd_name = "BR_INCREFS";
2292 node->has_weak_ref = 1;
2293 node->pending_weak_ref = 1;
2294 node->local_weak_refs++;
2295 } else if (strong && !node->has_strong_ref) {
2297 cmd_name = "BR_ACQUIRE";
2298 node->has_strong_ref = 1;
2299 node->pending_strong_ref = 1;
2300 node->local_strong_refs++;
2301 } else if (!strong && node->has_strong_ref) {
2303 cmd_name = "BR_RELEASE";
2304 node->has_strong_ref = 0;
2305 } else if (!weak && node->has_weak_ref) {
2307 cmd_name = "BR_DECREFS";
2308 node->has_weak_ref = 0;
2310 if (cmd != BR_NOOP) {
2311 if (put_user(cmd, (uint32_t __user *)ptr))
2313 ptr += sizeof(uint32_t);
2314 if (put_user(node->ptr,
2315 (binder_uintptr_t __user *)ptr))
2317 ptr += sizeof(binder_uintptr_t);
2318 if (put_user(node->cookie,
2319 (binder_uintptr_t __user *)ptr))
2321 ptr += sizeof(binder_uintptr_t);
2323 binder_stat_br(proc, thread, cmd);
2324 binder_debug(BINDER_DEBUG_USER_REFS,
2325 "%d:%d %s %d u%016llx c%016llx\n",
2326 proc->pid, thread->pid, cmd_name,
2328 (u64)node->ptr, (u64)node->cookie);
2330 list_del_init(&w->entry);
2331 if (!weak && !strong) {
2332 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2333 "%d:%d node %d u%016llx c%016llx deleted\n",
2334 proc->pid, thread->pid,
2338 rb_erase(&node->rb_node, &proc->nodes);
2340 binder_stats_deleted(BINDER_STAT_NODE);
2342 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2343 "%d:%d node %d u%016llx c%016llx state unchanged\n",
2344 proc->pid, thread->pid,
2351 case BINDER_WORK_DEAD_BINDER:
2352 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2353 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2354 struct binder_ref_death *death;
2357 death = container_of(w, struct binder_ref_death, work);
2358 if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2359 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2361 cmd = BR_DEAD_BINDER;
2362 if (put_user(cmd, (uint32_t __user *)ptr))
2364 ptr += sizeof(uint32_t);
2365 if (put_user(death->cookie,
2366 (binder_uintptr_t __user *)ptr))
2368 ptr += sizeof(binder_uintptr_t);
2369 binder_stat_br(proc, thread, cmd);
2370 binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2371 "%d:%d %s %016llx\n",
2372 proc->pid, thread->pid,
2373 cmd == BR_DEAD_BINDER ?
2375 "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2376 (u64)death->cookie);
2378 if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2379 list_del(&w->entry);
2381 binder_stats_deleted(BINDER_STAT_DEATH);
2383 list_move(&w->entry, &proc->delivered_death);
2384 if (cmd == BR_DEAD_BINDER)
2385 goto done; /* DEAD_BINDER notifications can cause transactions */
2392 BUG_ON(t->buffer == NULL);
2393 if (t->buffer->target_node) {
2394 struct binder_node *target_node = t->buffer->target_node;
2396 tr.target.ptr = target_node->ptr;
2397 tr.cookie = target_node->cookie;
2398 t->saved_priority = task_nice(current);
2399 if (t->priority < target_node->min_priority &&
2400 !(t->flags & TF_ONE_WAY))
2401 binder_set_nice(t->priority);
2402 else if (!(t->flags & TF_ONE_WAY) ||
2403 t->saved_priority > target_node->min_priority)
2404 binder_set_nice(target_node->min_priority);
2405 cmd = BR_TRANSACTION;
2412 tr.flags = t->flags;
2413 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2416 struct task_struct *sender = t->from->proc->tsk;
2418 tr.sender_pid = task_tgid_nr_ns(sender,
2419 task_active_pid_ns(current));
2424 tr.data_size = t->buffer->data_size;
2425 tr.offsets_size = t->buffer->offsets_size;
2426 tr.data.ptr.buffer = (binder_uintptr_t)(
2427 (uintptr_t)t->buffer->data +
2428 proc->user_buffer_offset);
2429 tr.data.ptr.offsets = tr.data.ptr.buffer +
2430 ALIGN(t->buffer->data_size,
2433 if (put_user(cmd, (uint32_t __user *)ptr))
2435 ptr += sizeof(uint32_t);
2436 if (copy_to_user(ptr, &tr, sizeof(tr)))
2440 trace_binder_transaction_received(t);
2441 binder_stat_br(proc, thread, cmd);
2442 binder_debug(BINDER_DEBUG_TRANSACTION,
2443 "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2444 proc->pid, thread->pid,
2445 (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2447 t->debug_id, t->from ? t->from->proc->pid : 0,
2448 t->from ? t->from->pid : 0, cmd,
2449 t->buffer->data_size, t->buffer->offsets_size,
2450 (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2452 list_del(&t->work.entry);
2453 t->buffer->allow_user_free = 1;
2454 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2455 t->to_parent = thread->transaction_stack;
2456 t->to_thread = thread;
2457 thread->transaction_stack = t;
2459 t->buffer->transaction = NULL;
2461 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2468 *consumed = ptr - buffer;
2469 if (proc->requested_threads + proc->ready_threads == 0 &&
2470 proc->requested_threads_started < proc->max_threads &&
2471 (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2472 BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2473 /*spawn a new thread if we leave this out */) {
2474 proc->requested_threads++;
2475 binder_debug(BINDER_DEBUG_THREADS,
2476 "%d:%d BR_SPAWN_LOOPER\n",
2477 proc->pid, thread->pid);
2478 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2480 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2485 static void binder_release_work(struct list_head *list)
2487 struct binder_work *w;
2489 while (!list_empty(list)) {
2490 w = list_first_entry(list, struct binder_work, entry);
2491 list_del_init(&w->entry);
2493 case BINDER_WORK_TRANSACTION: {
2494 struct binder_transaction *t;
2496 t = container_of(w, struct binder_transaction, work);
2497 if (t->buffer->target_node &&
2498 !(t->flags & TF_ONE_WAY)) {
2499 binder_send_failed_reply(t, BR_DEAD_REPLY);
2501 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2502 "undelivered transaction %d\n",
2504 t->buffer->transaction = NULL;
2506 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2509 case BINDER_WORK_TRANSACTION_COMPLETE: {
2510 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2511 "undelivered TRANSACTION_COMPLETE\n");
2513 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2515 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2516 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2517 struct binder_ref_death *death;
2519 death = container_of(w, struct binder_ref_death, work);
2520 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2521 "undelivered death notification, %016llx\n",
2522 (u64)death->cookie);
2524 binder_stats_deleted(BINDER_STAT_DEATH);
2527 pr_err("unexpected work type, %d, not freed\n",
2535 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2537 struct binder_thread *thread = NULL;
2538 struct rb_node *parent = NULL;
2539 struct rb_node **p = &proc->threads.rb_node;
2543 thread = rb_entry(parent, struct binder_thread, rb_node);
2545 if (current->pid < thread->pid)
2547 else if (current->pid > thread->pid)
2548 p = &(*p)->rb_right;
2553 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2556 binder_stats_created(BINDER_STAT_THREAD);
2557 thread->proc = proc;
2558 thread->pid = current->pid;
2559 init_waitqueue_head(&thread->wait);
2560 INIT_LIST_HEAD(&thread->todo);
2561 rb_link_node(&thread->rb_node, parent, p);
2562 rb_insert_color(&thread->rb_node, &proc->threads);
2563 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2564 thread->return_error = BR_OK;
2565 thread->return_error2 = BR_OK;
2570 static int binder_free_thread(struct binder_proc *proc,
2571 struct binder_thread *thread)
2573 struct binder_transaction *t;
2574 struct binder_transaction *send_reply = NULL;
2575 int active_transactions = 0;
2577 rb_erase(&thread->rb_node, &proc->threads);
2578 t = thread->transaction_stack;
2579 if (t && t->to_thread == thread)
2582 active_transactions++;
2583 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2584 "release %d:%d transaction %d %s, still active\n",
2585 proc->pid, thread->pid,
2587 (t->to_thread == thread) ? "in" : "out");
2589 if (t->to_thread == thread) {
2591 t->to_thread = NULL;
2593 t->buffer->transaction = NULL;
2597 } else if (t->from == thread) {
2604 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2605 binder_release_work(&thread->todo);
2607 binder_stats_deleted(BINDER_STAT_THREAD);
2608 return active_transactions;
2611 static unsigned int binder_poll(struct file *filp,
2612 struct poll_table_struct *wait)
2614 struct binder_proc *proc = filp->private_data;
2615 struct binder_thread *thread = NULL;
2616 int wait_for_proc_work;
2618 binder_lock(__func__);
2620 thread = binder_get_thread(proc);
2622 wait_for_proc_work = thread->transaction_stack == NULL &&
2623 list_empty(&thread->todo) && thread->return_error == BR_OK;
2625 binder_unlock(__func__);
2627 if (wait_for_proc_work) {
2628 if (binder_has_proc_work(proc, thread))
2630 poll_wait(filp, &proc->wait, wait);
2631 if (binder_has_proc_work(proc, thread))
2634 if (binder_has_thread_work(thread))
2636 poll_wait(filp, &thread->wait, wait);
2637 if (binder_has_thread_work(thread))
2643 static int binder_ioctl_write_read(struct file *filp,
2644 unsigned int cmd, unsigned long arg,
2645 struct binder_thread *thread)
2648 struct binder_proc *proc = filp->private_data;
2649 unsigned int size = _IOC_SIZE(cmd);
2650 void __user *ubuf = (void __user *)arg;
2651 struct binder_write_read bwr;
2653 if (size != sizeof(struct binder_write_read)) {
2657 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2661 binder_debug(BINDER_DEBUG_READ_WRITE,
2662 "%d:%d write %lld at %016llx, read %lld at %016llx\n",
2663 proc->pid, thread->pid,
2664 (u64)bwr.write_size, (u64)bwr.write_buffer,
2665 (u64)bwr.read_size, (u64)bwr.read_buffer);
2667 if (bwr.write_size > 0) {
2668 ret = binder_thread_write(proc, thread,
2671 &bwr.write_consumed);
2672 trace_binder_write_done(ret);
2674 bwr.read_consumed = 0;
2675 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2680 if (bwr.read_size > 0) {
2681 ret = binder_thread_read(proc, thread, bwr.read_buffer,
2684 filp->f_flags & O_NONBLOCK);
2685 trace_binder_read_done(ret);
2686 if (!list_empty(&proc->todo))
2687 wake_up_interruptible(&proc->wait);
2689 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2694 binder_debug(BINDER_DEBUG_READ_WRITE,
2695 "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
2696 proc->pid, thread->pid,
2697 (u64)bwr.write_consumed, (u64)bwr.write_size,
2698 (u64)bwr.read_consumed, (u64)bwr.read_size);
2699 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2707 static int binder_ioctl_set_ctx_mgr(struct file *filp)
2710 struct binder_proc *proc = filp->private_data;
2711 kuid_t curr_euid = current_euid();
2713 if (binder_context_mgr_node != NULL) {
2714 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2718 ret = security_binder_set_context_mgr(proc->tsk);
2721 if (uid_valid(binder_context_mgr_uid)) {
2722 if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
2723 pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2724 from_kuid(&init_user_ns, curr_euid),
2725 from_kuid(&init_user_ns,
2726 binder_context_mgr_uid));
2731 binder_context_mgr_uid = curr_euid;
2733 binder_context_mgr_node = binder_new_node(proc, 0, 0);
2734 if (binder_context_mgr_node == NULL) {
2738 binder_context_mgr_node->local_weak_refs++;
2739 binder_context_mgr_node->local_strong_refs++;
2740 binder_context_mgr_node->has_strong_ref = 1;
2741 binder_context_mgr_node->has_weak_ref = 1;
2746 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2749 struct binder_proc *proc = filp->private_data;
2750 struct binder_thread *thread;
2751 unsigned int size = _IOC_SIZE(cmd);
2752 void __user *ubuf = (void __user *)arg;
2754 /*pr_info("binder_ioctl: %d:%d %x %lx\n",
2755 proc->pid, current->pid, cmd, arg);*/
2757 trace_binder_ioctl(cmd, arg);
2759 ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2763 binder_lock(__func__);
2764 thread = binder_get_thread(proc);
2765 if (thread == NULL) {
2771 case BINDER_WRITE_READ:
2772 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
2776 case BINDER_SET_MAX_THREADS:
2777 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2782 case BINDER_SET_CONTEXT_MGR:
2783 ret = binder_ioctl_set_ctx_mgr(filp);
2787 case BINDER_THREAD_EXIT:
2788 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2789 proc->pid, thread->pid);
2790 binder_free_thread(proc, thread);
2793 case BINDER_VERSION: {
2794 struct binder_version __user *ver = ubuf;
2796 if (size != sizeof(struct binder_version)) {
2800 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
2801 &ver->protocol_version)) {
2814 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2815 binder_unlock(__func__);
2816 wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2817 if (ret && ret != -ERESTARTSYS)
2818 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2820 trace_binder_ioctl_done(ret);
2824 static void binder_vma_open(struct vm_area_struct *vma)
2826 struct binder_proc *proc = vma->vm_private_data;
2828 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2829 "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2830 proc->pid, vma->vm_start, vma->vm_end,
2831 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2832 (unsigned long)pgprot_val(vma->vm_page_prot));
2835 static void binder_vma_close(struct vm_area_struct *vma)
2837 struct binder_proc *proc = vma->vm_private_data;
2839 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2840 "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2841 proc->pid, vma->vm_start, vma->vm_end,
2842 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2843 (unsigned long)pgprot_val(vma->vm_page_prot));
2845 proc->vma_vm_mm = NULL;
2846 binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2849 static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2851 return VM_FAULT_SIGBUS;
2854 static const struct vm_operations_struct binder_vm_ops = {
2855 .open = binder_vma_open,
2856 .close = binder_vma_close,
2857 .fault = binder_vm_fault,
2860 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2863 struct vm_struct *area;
2864 struct binder_proc *proc = filp->private_data;
2865 const char *failure_string;
2866 struct binder_buffer *buffer;
2868 if (proc->tsk != current)
2871 if ((vma->vm_end - vma->vm_start) > SZ_4M)
2872 vma->vm_end = vma->vm_start + SZ_4M;
2874 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2875 "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2876 proc->pid, vma->vm_start, vma->vm_end,
2877 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2878 (unsigned long)pgprot_val(vma->vm_page_prot));
2880 if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2882 failure_string = "bad vm_flags";
2885 vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2887 mutex_lock(&binder_mmap_lock);
2890 failure_string = "already mapped";
2891 goto err_already_mapped;
2894 area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2897 failure_string = "get_vm_area";
2898 goto err_get_vm_area_failed;
2900 proc->buffer = area->addr;
2901 proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2902 mutex_unlock(&binder_mmap_lock);
2904 #ifdef CONFIG_CPU_CACHE_VIPT
2905 if (cache_is_vipt_aliasing()) {
2906 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2907 pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2908 vma->vm_start += PAGE_SIZE;
2912 proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2913 if (proc->pages == NULL) {
2915 failure_string = "alloc page array";
2916 goto err_alloc_pages_failed;
2918 proc->buffer_size = vma->vm_end - vma->vm_start;
2920 vma->vm_ops = &binder_vm_ops;
2921 vma->vm_private_data = proc;
2923 if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2925 failure_string = "alloc small buf";
2926 goto err_alloc_small_buf_failed;
2928 buffer = proc->buffer;
2929 INIT_LIST_HEAD(&proc->buffers);
2930 list_add(&buffer->entry, &proc->buffers);
2932 binder_insert_free_buffer(proc, buffer);
2933 proc->free_async_space = proc->buffer_size / 2;
2935 proc->files = get_files_struct(current);
2937 proc->vma_vm_mm = vma->vm_mm;
2939 /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2940 proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2943 err_alloc_small_buf_failed:
2946 err_alloc_pages_failed:
2947 mutex_lock(&binder_mmap_lock);
2948 vfree(proc->buffer);
2949 proc->buffer = NULL;
2950 err_get_vm_area_failed:
2952 mutex_unlock(&binder_mmap_lock);
2954 pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2955 proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2959 static int binder_open(struct inode *nodp, struct file *filp)
2961 struct binder_proc *proc;
2963 binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2964 current->group_leader->pid, current->pid);
2966 proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2969 get_task_struct(current);
2970 proc->tsk = current;
2971 INIT_LIST_HEAD(&proc->todo);
2972 init_waitqueue_head(&proc->wait);
2973 proc->default_priority = task_nice(current);
2975 binder_lock(__func__);
2977 binder_stats_created(BINDER_STAT_PROC);
2978 hlist_add_head(&proc->proc_node, &binder_procs);
2979 proc->pid = current->group_leader->pid;
2980 INIT_LIST_HEAD(&proc->delivered_death);
2981 filp->private_data = proc;
2983 binder_unlock(__func__);
2985 if (binder_debugfs_dir_entry_proc) {
2988 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2989 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2990 binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2996 static int binder_flush(struct file *filp, fl_owner_t id)
2998 struct binder_proc *proc = filp->private_data;
3000 binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
3005 static void binder_deferred_flush(struct binder_proc *proc)
3010 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
3011 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
3013 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3014 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
3015 wake_up_interruptible(&thread->wait);
3019 wake_up_interruptible_all(&proc->wait);
3021 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3022 "binder_flush: %d woke %d threads\n", proc->pid,
3026 static int binder_release(struct inode *nodp, struct file *filp)
3028 struct binder_proc *proc = filp->private_data;
3030 debugfs_remove(proc->debugfs_entry);
3031 binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
3036 static int binder_node_release(struct binder_node *node, int refs)
3038 struct binder_ref *ref;
3041 list_del_init(&node->work.entry);
3042 binder_release_work(&node->async_todo);
3044 if (hlist_empty(&node->refs)) {
3046 binder_stats_deleted(BINDER_STAT_NODE);
3052 node->local_strong_refs = 0;
3053 node->local_weak_refs = 0;
3054 hlist_add_head(&node->dead_node, &binder_dead_nodes);
3056 hlist_for_each_entry(ref, &node->refs, node_entry) {
3064 if (list_empty(&ref->death->work.entry)) {
3065 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3066 list_add_tail(&ref->death->work.entry,
3068 wake_up_interruptible(&ref->proc->wait);
3073 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3074 "node %d now dead, refs %d, death %d\n",
3075 node->debug_id, refs, death);
3080 static void binder_deferred_release(struct binder_proc *proc)
3082 struct binder_transaction *t;
3084 int threads, nodes, incoming_refs, outgoing_refs, buffers,
3085 active_transactions, page_count;
3088 BUG_ON(proc->files);
3090 hlist_del(&proc->proc_node);
3092 if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
3093 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3094 "%s: %d context_mgr_node gone\n",
3095 __func__, proc->pid);
3096 binder_context_mgr_node = NULL;
3100 active_transactions = 0;
3101 while ((n = rb_first(&proc->threads))) {
3102 struct binder_thread *thread;
3104 thread = rb_entry(n, struct binder_thread, rb_node);
3106 active_transactions += binder_free_thread(proc, thread);
3111 while ((n = rb_first(&proc->nodes))) {
3112 struct binder_node *node;
3114 node = rb_entry(n, struct binder_node, rb_node);
3116 rb_erase(&node->rb_node, &proc->nodes);
3117 incoming_refs = binder_node_release(node, incoming_refs);
3121 while ((n = rb_first(&proc->refs_by_desc))) {
3122 struct binder_ref *ref;
3124 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3126 binder_delete_ref(ref);
3129 binder_release_work(&proc->todo);
3130 binder_release_work(&proc->delivered_death);
3133 while ((n = rb_first(&proc->allocated_buffers))) {
3134 struct binder_buffer *buffer;
3136 buffer = rb_entry(n, struct binder_buffer, rb_node);
3138 t = buffer->transaction;
3141 buffer->transaction = NULL;
3142 pr_err("release proc %d, transaction %d, not freed\n",
3143 proc->pid, t->debug_id);
3147 binder_free_buf(proc, buffer);
3151 binder_stats_deleted(BINDER_STAT_PROC);
3157 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3160 if (!proc->pages[i])
3163 page_addr = proc->buffer + i * PAGE_SIZE;
3164 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3165 "%s: %d: page %d at %p not freed\n",
3166 __func__, proc->pid, i, page_addr);
3167 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3168 __free_page(proc->pages[i]);
3172 vfree(proc->buffer);
3175 put_task_struct(proc->tsk);
3177 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3178 "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3179 __func__, proc->pid, threads, nodes, incoming_refs,
3180 outgoing_refs, active_transactions, buffers, page_count);
3185 static void binder_deferred_func(struct work_struct *work)
3187 struct binder_proc *proc;
3188 struct files_struct *files;
3193 binder_lock(__func__);
3194 mutex_lock(&binder_deferred_lock);
3195 if (!hlist_empty(&binder_deferred_list)) {
3196 proc = hlist_entry(binder_deferred_list.first,
3197 struct binder_proc, deferred_work_node);
3198 hlist_del_init(&proc->deferred_work_node);
3199 defer = proc->deferred_work;
3200 proc->deferred_work = 0;
3205 mutex_unlock(&binder_deferred_lock);
3208 if (defer & BINDER_DEFERRED_PUT_FILES) {
3209 files = proc->files;
3214 if (defer & BINDER_DEFERRED_FLUSH)
3215 binder_deferred_flush(proc);
3217 if (defer & BINDER_DEFERRED_RELEASE)
3218 binder_deferred_release(proc); /* frees proc */
3220 binder_unlock(__func__);
3222 put_files_struct(files);
3225 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3228 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3230 mutex_lock(&binder_deferred_lock);
3231 proc->deferred_work |= defer;
3232 if (hlist_unhashed(&proc->deferred_work_node)) {
3233 hlist_add_head(&proc->deferred_work_node,
3234 &binder_deferred_list);
3235 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3237 mutex_unlock(&binder_deferred_lock);
3240 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3241 struct binder_transaction *t)
3244 "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3245 prefix, t->debug_id, t,
3246 t->from ? t->from->proc->pid : 0,
3247 t->from ? t->from->pid : 0,
3248 t->to_proc ? t->to_proc->pid : 0,
3249 t->to_thread ? t->to_thread->pid : 0,
3250 t->code, t->flags, t->priority, t->need_reply);
3251 if (t->buffer == NULL) {
3252 seq_puts(m, " buffer free\n");
3255 if (t->buffer->target_node)
3256 seq_printf(m, " node %d",
3257 t->buffer->target_node->debug_id);
3258 seq_printf(m, " size %zd:%zd data %p\n",
3259 t->buffer->data_size, t->buffer->offsets_size,
3263 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3264 struct binder_buffer *buffer)
3266 seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3267 prefix, buffer->debug_id, buffer->data,
3268 buffer->data_size, buffer->offsets_size,
3269 buffer->transaction ? "active" : "delivered");
3272 static void print_binder_work(struct seq_file *m, const char *prefix,
3273 const char *transaction_prefix,
3274 struct binder_work *w)
3276 struct binder_node *node;
3277 struct binder_transaction *t;
3280 case BINDER_WORK_TRANSACTION:
3281 t = container_of(w, struct binder_transaction, work);
3282 print_binder_transaction(m, transaction_prefix, t);
3284 case BINDER_WORK_TRANSACTION_COMPLETE:
3285 seq_printf(m, "%stransaction complete\n", prefix);
3287 case BINDER_WORK_NODE:
3288 node = container_of(w, struct binder_node, work);
3289 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3290 prefix, node->debug_id,
3291 (u64)node->ptr, (u64)node->cookie);
3293 case BINDER_WORK_DEAD_BINDER:
3294 seq_printf(m, "%shas dead binder\n", prefix);
3296 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3297 seq_printf(m, "%shas cleared dead binder\n", prefix);
3299 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3300 seq_printf(m, "%shas cleared death notification\n", prefix);
3303 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3308 static void print_binder_thread(struct seq_file *m,
3309 struct binder_thread *thread,
3312 struct binder_transaction *t;
3313 struct binder_work *w;
3314 size_t start_pos = m->count;
3317 seq_printf(m, " thread %d: l %02x\n", thread->pid, thread->looper);
3318 header_pos = m->count;
3319 t = thread->transaction_stack;
3321 if (t->from == thread) {
3322 print_binder_transaction(m,
3323 " outgoing transaction", t);
3325 } else if (t->to_thread == thread) {
3326 print_binder_transaction(m,
3327 " incoming transaction", t);
3330 print_binder_transaction(m, " bad transaction", t);
3334 list_for_each_entry(w, &thread->todo, entry) {
3335 print_binder_work(m, " ", " pending transaction", w);
3337 if (!print_always && m->count == header_pos)
3338 m->count = start_pos;
3341 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3343 struct binder_ref *ref;
3344 struct binder_work *w;
3348 hlist_for_each_entry(ref, &node->refs, node_entry)
3351 seq_printf(m, " node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3352 node->debug_id, (u64)node->ptr, (u64)node->cookie,
3353 node->has_strong_ref, node->has_weak_ref,
3354 node->local_strong_refs, node->local_weak_refs,
3355 node->internal_strong_refs, count);
3357 seq_puts(m, " proc");
3358 hlist_for_each_entry(ref, &node->refs, node_entry)
3359 seq_printf(m, " %d", ref->proc->pid);
3362 list_for_each_entry(w, &node->async_todo, entry)
3363 print_binder_work(m, " ",
3364 " pending async transaction", w);
3367 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3369 seq_printf(m, " ref %d: desc %d %snode %d s %d w %d d %p\n",
3370 ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3371 ref->node->debug_id, ref->strong, ref->weak, ref->death);
3374 static void print_binder_proc(struct seq_file *m,
3375 struct binder_proc *proc, int print_all)
3377 struct binder_work *w;
3379 size_t start_pos = m->count;
3382 seq_printf(m, "proc %d\n", proc->pid);
3383 header_pos = m->count;
3385 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3386 print_binder_thread(m, rb_entry(n, struct binder_thread,
3387 rb_node), print_all);
3388 for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3389 struct binder_node *node = rb_entry(n, struct binder_node,
3391 if (print_all || node->has_async_transaction)
3392 print_binder_node(m, node);
3395 for (n = rb_first(&proc->refs_by_desc);
3398 print_binder_ref(m, rb_entry(n, struct binder_ref,
3401 for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3402 print_binder_buffer(m, " buffer",
3403 rb_entry(n, struct binder_buffer, rb_node));
3404 list_for_each_entry(w, &proc->todo, entry)
3405 print_binder_work(m, " ", " pending transaction", w);
3406 list_for_each_entry(w, &proc->delivered_death, entry) {
3407 seq_puts(m, " has delivered dead binder\n");
3410 if (!print_all && m->count == header_pos)
3411 m->count = start_pos;
3414 static const char * const binder_return_strings[] = {
3419 "BR_ACQUIRE_RESULT",
3421 "BR_TRANSACTION_COMPLETE",
3426 "BR_ATTEMPT_ACQUIRE",
3431 "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3435 static const char * const binder_command_strings[] = {
3438 "BC_ACQUIRE_RESULT",
3446 "BC_ATTEMPT_ACQUIRE",
3447 "BC_REGISTER_LOOPER",
3450 "BC_REQUEST_DEATH_NOTIFICATION",
3451 "BC_CLEAR_DEATH_NOTIFICATION",
3452 "BC_DEAD_BINDER_DONE"
3455 static const char * const binder_objstat_strings[] = {
3462 "transaction_complete"
3465 static void print_binder_stats(struct seq_file *m, const char *prefix,
3466 struct binder_stats *stats)
3470 BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3471 ARRAY_SIZE(binder_command_strings));
3472 for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3474 seq_printf(m, "%s%s: %d\n", prefix,
3475 binder_command_strings[i], stats->bc[i]);
3478 BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3479 ARRAY_SIZE(binder_return_strings));
3480 for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3482 seq_printf(m, "%s%s: %d\n", prefix,
3483 binder_return_strings[i], stats->br[i]);
3486 BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3487 ARRAY_SIZE(binder_objstat_strings));
3488 BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3489 ARRAY_SIZE(stats->obj_deleted));
3490 for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3491 if (stats->obj_created[i] || stats->obj_deleted[i])
3492 seq_printf(m, "%s%s: active %d total %d\n", prefix,
3493 binder_objstat_strings[i],
3494 stats->obj_created[i] - stats->obj_deleted[i],
3495 stats->obj_created[i]);
3499 static void print_binder_proc_stats(struct seq_file *m,
3500 struct binder_proc *proc)
3502 struct binder_work *w;
3504 int count, strong, weak;
3506 seq_printf(m, "proc %d\n", proc->pid);
3508 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3510 seq_printf(m, " threads: %d\n", count);
3511 seq_printf(m, " requested threads: %d+%d/%d\n"
3512 " ready threads %d\n"
3513 " free async space %zd\n", proc->requested_threads,
3514 proc->requested_threads_started, proc->max_threads,
3515 proc->ready_threads, proc->free_async_space);
3517 for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3519 seq_printf(m, " nodes: %d\n", count);
3523 for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3524 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3527 strong += ref->strong;
3530 seq_printf(m, " refs: %d s %d w %d\n", count, strong, weak);
3533 for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3535 seq_printf(m, " buffers: %d\n", count);
3538 list_for_each_entry(w, &proc->todo, entry) {
3540 case BINDER_WORK_TRANSACTION:
3547 seq_printf(m, " pending transactions: %d\n", count);
3549 print_binder_stats(m, " ", &proc->stats);
3553 static int binder_state_show(struct seq_file *m, void *unused)
3555 struct binder_proc *proc;
3556 struct binder_node *node;
3557 int do_lock = !binder_debug_no_lock;
3560 binder_lock(__func__);
3562 seq_puts(m, "binder state:\n");
3564 if (!hlist_empty(&binder_dead_nodes))
3565 seq_puts(m, "dead nodes:\n");
3566 hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3567 print_binder_node(m, node);
3569 hlist_for_each_entry(proc, &binder_procs, proc_node)
3570 print_binder_proc(m, proc, 1);
3572 binder_unlock(__func__);
3576 static int binder_stats_show(struct seq_file *m, void *unused)
3578 struct binder_proc *proc;
3579 int do_lock = !binder_debug_no_lock;
3582 binder_lock(__func__);
3584 seq_puts(m, "binder stats:\n");
3586 print_binder_stats(m, "", &binder_stats);
3588 hlist_for_each_entry(proc, &binder_procs, proc_node)
3589 print_binder_proc_stats(m, proc);
3591 binder_unlock(__func__);
3595 static int binder_transactions_show(struct seq_file *m, void *unused)
3597 struct binder_proc *proc;
3598 int do_lock = !binder_debug_no_lock;
3601 binder_lock(__func__);
3603 seq_puts(m, "binder transactions:\n");
3604 hlist_for_each_entry(proc, &binder_procs, proc_node)
3605 print_binder_proc(m, proc, 0);
3607 binder_unlock(__func__);
3611 static int binder_proc_show(struct seq_file *m, void *unused)
3613 struct binder_proc *proc = m->private;
3614 int do_lock = !binder_debug_no_lock;
3617 binder_lock(__func__);
3618 seq_puts(m, "binder proc state:\n");
3619 print_binder_proc(m, proc, 1);
3621 binder_unlock(__func__);
3625 static void print_binder_transaction_log_entry(struct seq_file *m,
3626 struct binder_transaction_log_entry *e)
3629 "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3630 e->debug_id, (e->call_type == 2) ? "reply" :
3631 ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3632 e->from_thread, e->to_proc, e->to_thread, e->to_node,
3633 e->target_handle, e->data_size, e->offsets_size);
3636 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3638 struct binder_transaction_log *log = m->private;
3642 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3643 print_binder_transaction_log_entry(m, &log->entry[i]);
3645 for (i = 0; i < log->next; i++)
3646 print_binder_transaction_log_entry(m, &log->entry[i]);
3650 static const struct file_operations binder_fops = {
3651 .owner = THIS_MODULE,
3652 .poll = binder_poll,
3653 .unlocked_ioctl = binder_ioctl,
3654 .compat_ioctl = binder_ioctl,
3655 .mmap = binder_mmap,
3656 .open = binder_open,
3657 .flush = binder_flush,
3658 .release = binder_release,
3661 static struct miscdevice binder_miscdev = {
3662 .minor = MISC_DYNAMIC_MINOR,
3664 .fops = &binder_fops
3667 BINDER_DEBUG_ENTRY(state);
3668 BINDER_DEBUG_ENTRY(stats);
3669 BINDER_DEBUG_ENTRY(transactions);
3670 BINDER_DEBUG_ENTRY(transaction_log);
3672 static int __init binder_init(void)
3676 binder_deferred_workqueue = create_singlethread_workqueue("binder");
3677 if (!binder_deferred_workqueue)
3680 binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3681 if (binder_debugfs_dir_entry_root)
3682 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3683 binder_debugfs_dir_entry_root);
3684 ret = misc_register(&binder_miscdev);
3685 if (binder_debugfs_dir_entry_root) {
3686 debugfs_create_file("state",
3688 binder_debugfs_dir_entry_root,
3690 &binder_state_fops);
3691 debugfs_create_file("stats",
3693 binder_debugfs_dir_entry_root,
3695 &binder_stats_fops);
3696 debugfs_create_file("transactions",
3698 binder_debugfs_dir_entry_root,
3700 &binder_transactions_fops);
3701 debugfs_create_file("transaction_log",
3703 binder_debugfs_dir_entry_root,
3704 &binder_transaction_log,
3705 &binder_transaction_log_fops);
3706 debugfs_create_file("failed_transaction_log",
3708 binder_debugfs_dir_entry_root,
3709 &binder_transaction_log_failed,
3710 &binder_transaction_log_fops);
3715 device_initcall(binder_init);
3717 #define CREATE_TRACE_POINTS
3718 #include "binder_trace.h"
3720 MODULE_LICENSE("GPL v2");