projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge remote-tracking branches 'spi/topic/sirf', 'spi/topic/spidev' and 'spi/topic...
[deliverable/linux.git] / drivers / android / binder.c
1 /* binder.c
2 *
3 * Android IPC Subsystem
4 *
5 * Copyright (C) 2007-2008 Google, Inc.
6 *
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 */
17
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20 #include <asm/cacheflush.h>
21 #include <linux/fdtable.h>
22 #include <linux/file.h>
23 #include <linux/freezer.h>
24 #include <linux/fs.h>
25 #include <linux/list.h>
26 #include <linux/miscdevice.h>
27 #include <linux/mm.h>
28 #include <linux/module.h>
29 #include <linux/mutex.h>
30 #include <linux/nsproxy.h>
31 #include <linux/poll.h>
32 #include <linux/debugfs.h>
33 #include <linux/rbtree.h>
34 #include <linux/sched.h>
35 #include <linux/seq_file.h>
36 #include <linux/uaccess.h>
37 #include <linux/vmalloc.h>
38 #include <linux/slab.h>
39 #include <linux/pid_namespace.h>
40 #include <linux/security.h>
41
42 #ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
43 #define BINDER_IPC_32BIT 1
44 #endif
45
46 #include <uapi/linux/android/binder.h>
47 #include "binder_trace.h"
48
49 static DEFINE_MUTEX(binder_main_lock);
50 static DEFINE_MUTEX(binder_deferred_lock);
51 static DEFINE_MUTEX(binder_mmap_lock);
52
53 static HLIST_HEAD(binder_procs);
54 static HLIST_HEAD(binder_deferred_list);
55 static HLIST_HEAD(binder_dead_nodes);
56
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;
63
64 #define BINDER_DEBUG_ENTRY(name) \
65 static int binder_##name##_open(struct inode *inode, struct file *file) \
66 { \
67 return single_open(file, binder_##name##_show, inode->i_private); \
68 } \
69 \
70 static const struct file_operations binder_##name##_fops = { \
71 .owner = THIS_MODULE, \
72 .open = binder_##name##_open, \
73 .read = seq_read, \
74 .llseek = seq_lseek, \
75 .release = single_release, \
76 }
77
78 static int binder_proc_show(struct seq_file *m, void *unused);
79 BINDER_DEBUG_ENTRY(proc);
80
81 /* This is only defined in include/asm-arm/sizes.h */
82 #ifndef SZ_1K
83 #define SZ_1K 0x400
84 #endif
85
86 #ifndef SZ_4M
87 #define SZ_4M 0x400000
88 #endif
89
90 #define FORBIDDEN_MMAP_FLAGS (VM_WRITE)
91
92 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
93
94 enum {
95 BINDER_DEBUG_USER_ERROR = 1U << 0,
96 BINDER_DEBUG_FAILED_TRANSACTION = 1U << 1,
97 BINDER_DEBUG_DEAD_TRANSACTION = 1U << 2,
98 BINDER_DEBUG_OPEN_CLOSE = 1U << 3,
99 BINDER_DEBUG_DEAD_BINDER = 1U << 4,
100 BINDER_DEBUG_DEATH_NOTIFICATION = 1U << 5,
101 BINDER_DEBUG_READ_WRITE = 1U << 6,
102 BINDER_DEBUG_USER_REFS = 1U << 7,
103 BINDER_DEBUG_THREADS = 1U << 8,
104 BINDER_DEBUG_TRANSACTION = 1U << 9,
105 BINDER_DEBUG_TRANSACTION_COMPLETE = 1U << 10,
106 BINDER_DEBUG_FREE_BUFFER = 1U << 11,
107 BINDER_DEBUG_INTERNAL_REFS = 1U << 12,
108 BINDER_DEBUG_BUFFER_ALLOC = 1U << 13,
109 BINDER_DEBUG_PRIORITY_CAP = 1U << 14,
110 BINDER_DEBUG_BUFFER_ALLOC_ASYNC = 1U << 15,
111 };
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);
115
116 static bool binder_debug_no_lock;
117 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
118
119 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
120 static int binder_stop_on_user_error;
121
122 static int binder_set_stop_on_user_error(const char *val,
123 struct kernel_param *kp)
124 {
125 int ret;
126
127 ret = param_set_int(val, kp);
128 if (binder_stop_on_user_error < 2)
129 wake_up(&binder_user_error_wait);
130 return ret;
131 }
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);
134
135 #define binder_debug(mask, x...) \
136 do { \
137 if (binder_debug_mask & mask) \
138 pr_info(x); \
139 } while (0)
140
141 #define binder_user_error(x...) \
142 do { \
143 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
144 pr_info(x); \
145 if (binder_stop_on_user_error) \
146 binder_stop_on_user_error = 2; \
147 } while (0)
148
149 enum binder_stat_types {
150 BINDER_STAT_PROC,
151 BINDER_STAT_THREAD,
152 BINDER_STAT_NODE,
153 BINDER_STAT_REF,
154 BINDER_STAT_DEATH,
155 BINDER_STAT_TRANSACTION,
156 BINDER_STAT_TRANSACTION_COMPLETE,
157 BINDER_STAT_COUNT
158 };
159
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];
165 };
166
167 static struct binder_stats binder_stats;
168
169 static inline void binder_stats_deleted(enum binder_stat_types type)
170 {
171 binder_stats.obj_deleted[type]++;
172 }
173
174 static inline void binder_stats_created(enum binder_stat_types type)
175 {
176 binder_stats.obj_created[type]++;
177 }
178
179 struct binder_transaction_log_entry {
180 int debug_id;
181 int call_type;
182 int from_proc;
183 int from_thread;
184 int target_handle;
185 int to_proc;
186 int to_thread;
187 int to_node;
188 int data_size;
189 int offsets_size;
190 };
191 struct binder_transaction_log {
192 int next;
193 int full;
194 struct binder_transaction_log_entry entry[32];
195 };
196 static struct binder_transaction_log binder_transaction_log;
197 static struct binder_transaction_log binder_transaction_log_failed;
198
199 static struct binder_transaction_log_entry *binder_transaction_log_add(
200 struct binder_transaction_log *log)
201 {
202 struct binder_transaction_log_entry *e;
203
204 e = &log->entry[log->next];
205 memset(e, 0, sizeof(*e));
206 log->next++;
207 if (log->next == ARRAY_SIZE(log->entry)) {
208 log->next = 0;
209 log->full = 1;
210 }
211 return e;
212 }
213
214 struct binder_work {
215 struct list_head entry;
216 enum {
217 BINDER_WORK_TRANSACTION = 1,
218 BINDER_WORK_TRANSACTION_COMPLETE,
219 BINDER_WORK_NODE,
220 BINDER_WORK_DEAD_BINDER,
221 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
222 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
223 } type;
224 };
225
226 struct binder_node {
227 int debug_id;
228 struct binder_work work;
229 union {
230 struct rb_node rb_node;
231 struct hlist_node dead_node;
232 };
233 struct binder_proc *proc;
234 struct hlist_head refs;
235 int internal_strong_refs;
236 int local_weak_refs;
237 int local_strong_refs;
238 binder_uintptr_t ptr;
239 binder_uintptr_t cookie;
240 unsigned has_strong_ref:1;
241 unsigned pending_strong_ref:1;
242 unsigned has_weak_ref:1;
243 unsigned pending_weak_ref:1;
244 unsigned has_async_transaction:1;
245 unsigned accept_fds:1;
246 unsigned min_priority:8;
247 struct list_head async_todo;
248 };
249
250 struct binder_ref_death {
251 struct binder_work work;
252 binder_uintptr_t cookie;
253 };
254
255 struct binder_ref {
256 /* Lookups needed: */
257 /* node + proc => ref (transaction) */
258 /* desc + proc => ref (transaction, inc/dec ref) */
259 /* node => refs + procs (proc exit) */
260 int debug_id;
261 struct rb_node rb_node_desc;
262 struct rb_node rb_node_node;
263 struct hlist_node node_entry;
264 struct binder_proc *proc;
265 struct binder_node *node;
266 uint32_t desc;
267 int strong;
268 int weak;
269 struct binder_ref_death *death;
270 };
271
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 */
275 /* by address */
276 unsigned free:1;
277 unsigned allow_user_free:1;
278 unsigned async_transaction:1;
279 unsigned debug_id:29;
280
281 struct binder_transaction *transaction;
282
283 struct binder_node *target_node;
284 size_t data_size;
285 size_t offsets_size;
286 uint8_t data[0];
287 };
288
289 enum binder_deferred_state {
290 BINDER_DEFERRED_PUT_FILES = 0x01,
291 BINDER_DEFERRED_FLUSH = 0x02,
292 BINDER_DEFERRED_RELEASE = 0x04,
293 };
294
295 struct binder_proc {
296 struct hlist_node proc_node;
297 struct rb_root threads;
298 struct rb_root nodes;
299 struct rb_root refs_by_desc;
300 struct rb_root refs_by_node;
301 int pid;
302 struct vm_area_struct *vma;
303 struct mm_struct *vma_vm_mm;
304 struct task_struct *tsk;
305 struct files_struct *files;
306 struct hlist_node deferred_work_node;
307 int deferred_work;
308 void *buffer;
309 ptrdiff_t user_buffer_offset;
310
311 struct list_head buffers;
312 struct rb_root free_buffers;
313 struct rb_root allocated_buffers;
314 size_t free_async_space;
315
316 struct page **pages;
317 size_t buffer_size;
318 uint32_t buffer_free;
319 struct list_head todo;
320 wait_queue_head_t wait;
321 struct binder_stats stats;
322 struct list_head delivered_death;
323 int max_threads;
324 int requested_threads;
325 int requested_threads_started;
326 int ready_threads;
327 long default_priority;
328 struct dentry *debugfs_entry;
329 };
330
331 enum {
332 BINDER_LOOPER_STATE_REGISTERED = 0x01,
333 BINDER_LOOPER_STATE_ENTERED = 0x02,
334 BINDER_LOOPER_STATE_EXITED = 0x04,
335 BINDER_LOOPER_STATE_INVALID = 0x08,
336 BINDER_LOOPER_STATE_WAITING = 0x10,
337 BINDER_LOOPER_STATE_NEED_RETURN = 0x20
338 };
339
340 struct binder_thread {
341 struct binder_proc *proc;
342 struct rb_node rb_node;
343 int pid;
344 int looper;
345 struct binder_transaction *transaction_stack;
346 struct list_head todo;
347 uint32_t return_error; /* Write failed, return error code in read buf */
348 uint32_t return_error2; /* Write failed, return error code in read */
349 /* buffer. Used when sending a reply to a dead process that */
350 /* we are also waiting on */
351 wait_queue_head_t wait;
352 struct binder_stats stats;
353 };
354
355 struct binder_transaction {
356 int debug_id;
357 struct binder_work work;
358 struct binder_thread *from;
359 struct binder_transaction *from_parent;
360 struct binder_proc *to_proc;
361 struct binder_thread *to_thread;
362 struct binder_transaction *to_parent;
363 unsigned need_reply:1;
364 /* unsigned is_dead:1; */ /* not used at the moment */
365
366 struct binder_buffer *buffer;
367 unsigned int code;
368 unsigned int flags;
369 long priority;
370 long saved_priority;
371 kuid_t sender_euid;
372 };
373
374 static void
375 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
376
377 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
378 {
379 struct files_struct *files = proc->files;
380 unsigned long rlim_cur;
381 unsigned long irqs;
382
383 if (files == NULL)
384 return -ESRCH;
385
386 if (!lock_task_sighand(proc->tsk, &irqs))
387 return -EMFILE;
388
389 rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
390 unlock_task_sighand(proc->tsk, &irqs);
391
392 return __alloc_fd(files, 0, rlim_cur, flags);
393 }
394
395 /*
396 * copied from fd_install
397 */
398 static void task_fd_install(
399 struct binder_proc *proc, unsigned int fd, struct file *file)
400 {
401 if (proc->files)
402 __fd_install(proc->files, fd, file);
403 }
404
405 /*
406 * copied from sys_close
407 */
408 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
409 {
410 int retval;
411
412 if (proc->files == NULL)
413 return -ESRCH;
414
415 retval = __close_fd(proc->files, fd);
416 /* can't restart close syscall because file table entry was cleared */
417 if (unlikely(retval == -ERESTARTSYS ||
418 retval == -ERESTARTNOINTR ||
419 retval == -ERESTARTNOHAND ||
420 retval == -ERESTART_RESTARTBLOCK))
421 retval = -EINTR;
422
423 return retval;
424 }
425
426 static inline void binder_lock(const char *tag)
427 {
428 trace_binder_lock(tag);
429 mutex_lock(&binder_main_lock);
430 trace_binder_locked(tag);
431 }
432
433 static inline void binder_unlock(const char *tag)
434 {
435 trace_binder_unlock(tag);
436 mutex_unlock(&binder_main_lock);
437 }
438
439 static void binder_set_nice(long nice)
440 {
441 long min_nice;
442
443 if (can_nice(current, nice)) {
444 set_user_nice(current, nice);
445 return;
446 }
447 min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
448 binder_debug(BINDER_DEBUG_PRIORITY_CAP,
449 "%d: nice value %ld not allowed use %ld instead\n",
450 current->pid, nice, min_nice);
451 set_user_nice(current, min_nice);
452 if (min_nice <= MAX_NICE)
453 return;
454 binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
455 }
456
457 static size_t binder_buffer_size(struct binder_proc *proc,
458 struct binder_buffer *buffer)
459 {
460 if (list_is_last(&buffer->entry, &proc->buffers))
461 return proc->buffer + proc->buffer_size - (void *)buffer->data;
462 return (size_t)list_entry(buffer->entry.next,
463 struct binder_buffer, entry) - (size_t)buffer->data;
464 }
465
466 static void binder_insert_free_buffer(struct binder_proc *proc,
467 struct binder_buffer *new_buffer)
468 {
469 struct rb_node **p = &proc->free_buffers.rb_node;
470 struct rb_node *parent = NULL;
471 struct binder_buffer *buffer;
472 size_t buffer_size;
473 size_t new_buffer_size;
474
475 BUG_ON(!new_buffer->free);
476
477 new_buffer_size = binder_buffer_size(proc, new_buffer);
478
479 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
480 "%d: add free buffer, size %zd, at %p\n",
481 proc->pid, new_buffer_size, new_buffer);
482
483 while (*p) {
484 parent = *p;
485 buffer = rb_entry(parent, struct binder_buffer, rb_node);
486 BUG_ON(!buffer->free);
487
488 buffer_size = binder_buffer_size(proc, buffer);
489
490 if (new_buffer_size < buffer_size)
491 p = &parent->rb_left;
492 else
493 p = &parent->rb_right;
494 }
495 rb_link_node(&new_buffer->rb_node, parent, p);
496 rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
497 }
498
499 static void binder_insert_allocated_buffer(struct binder_proc *proc,
500 struct binder_buffer *new_buffer)
501 {
502 struct rb_node **p = &proc->allocated_buffers.rb_node;
503 struct rb_node *parent = NULL;
504 struct binder_buffer *buffer;
505
506 BUG_ON(new_buffer->free);
507
508 while (*p) {
509 parent = *p;
510 buffer = rb_entry(parent, struct binder_buffer, rb_node);
511 BUG_ON(buffer->free);
512
513 if (new_buffer < buffer)
514 p = &parent->rb_left;
515 else if (new_buffer > buffer)
516 p = &parent->rb_right;
517 else
518 BUG();
519 }
520 rb_link_node(&new_buffer->rb_node, parent, p);
521 rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
522 }
523
524 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
525 uintptr_t user_ptr)
526 {
527 struct rb_node *n = proc->allocated_buffers.rb_node;
528 struct binder_buffer *buffer;
529 struct binder_buffer *kern_ptr;
530
531 kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
532 - offsetof(struct binder_buffer, data));
533
534 while (n) {
535 buffer = rb_entry(n, struct binder_buffer, rb_node);
536 BUG_ON(buffer->free);
537
538 if (kern_ptr < buffer)
539 n = n->rb_left;
540 else if (kern_ptr > buffer)
541 n = n->rb_right;
542 else
543 return buffer;
544 }
545 return NULL;
546 }
547
548 static int binder_update_page_range(struct binder_proc *proc, int allocate,
549 void *start, void *end,
550 struct vm_area_struct *vma)
551 {
552 void *page_addr;
553 unsigned long user_page_addr;
554 struct page **page;
555 struct mm_struct *mm;
556
557 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
558 "%d: %s pages %p-%p\n", proc->pid,
559 allocate ? "allocate" : "free", start, end);
560
561 if (end <= start)
562 return 0;
563
564 trace_binder_update_page_range(proc, allocate, start, end);
565
566 if (vma)
567 mm = NULL;
568 else
569 mm = get_task_mm(proc->tsk);
570
571 if (mm) {
572 down_write(&mm->mmap_sem);
573 vma = proc->vma;
574 if (vma && mm != proc->vma_vm_mm) {
575 pr_err("%d: vma mm and task mm mismatch\n",
576 proc->pid);
577 vma = NULL;
578 }
579 }
580
581 if (allocate == 0)
582 goto free_range;
583
584 if (vma == NULL) {
585 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
586 proc->pid);
587 goto err_no_vma;
588 }
589
590 for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
591 int ret;
592
593 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
594
595 BUG_ON(*page);
596 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
597 if (*page == NULL) {
598 pr_err("%d: binder_alloc_buf failed for page at %p\n",
599 proc->pid, page_addr);
600 goto err_alloc_page_failed;
601 }
602 ret = map_kernel_range_noflush((unsigned long)page_addr,
603 PAGE_SIZE, PAGE_KERNEL, page);
604 flush_cache_vmap((unsigned long)page_addr,
605 (unsigned long)page_addr + PAGE_SIZE);
606 if (ret != 1) {
607 pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
608 proc->pid, page_addr);
609 goto err_map_kernel_failed;
610 }
611 user_page_addr =
612 (uintptr_t)page_addr + proc->user_buffer_offset;
613 ret = vm_insert_page(vma, user_page_addr, page[0]);
614 if (ret) {
615 pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
616 proc->pid, user_page_addr);
617 goto err_vm_insert_page_failed;
618 }
619 /* vm_insert_page does not seem to increment the refcount */
620 }
621 if (mm) {
622 up_write(&mm->mmap_sem);
623 mmput(mm);
624 }
625 return 0;
626
627 free_range:
628 for (page_addr = end - PAGE_SIZE; page_addr >= start;
629 page_addr -= PAGE_SIZE) {
630 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
631 if (vma)
632 zap_page_range(vma, (uintptr_t)page_addr +
633 proc->user_buffer_offset, PAGE_SIZE, NULL);
634 err_vm_insert_page_failed:
635 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
636 err_map_kernel_failed:
637 __free_page(*page);
638 *page = NULL;
639 err_alloc_page_failed:
640 ;
641 }
642 err_no_vma:
643 if (mm) {
644 up_write(&mm->mmap_sem);
645 mmput(mm);
646 }
647 return -ENOMEM;
648 }
649
650 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
651 size_t data_size,
652 size_t offsets_size, int is_async)
653 {
654 struct rb_node *n = proc->free_buffers.rb_node;
655 struct binder_buffer *buffer;
656 size_t buffer_size;
657 struct rb_node *best_fit = NULL;
658 void *has_page_addr;
659 void *end_page_addr;
660 size_t size;
661
662 if (proc->vma == NULL) {
663 pr_err("%d: binder_alloc_buf, no vma\n",
664 proc->pid);
665 return NULL;
666 }
667
668 size = ALIGN(data_size, sizeof(void *)) +
669 ALIGN(offsets_size, sizeof(void *));
670
671 if (size < data_size || size < offsets_size) {
672 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
673 proc->pid, data_size, offsets_size);
674 return NULL;
675 }
676
677 if (is_async &&
678 proc->free_async_space < size + sizeof(struct binder_buffer)) {
679 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
680 "%d: binder_alloc_buf size %zd failed, no async space left\n",
681 proc->pid, size);
682 return NULL;
683 }
684
685 while (n) {
686 buffer = rb_entry(n, struct binder_buffer, rb_node);
687 BUG_ON(!buffer->free);
688 buffer_size = binder_buffer_size(proc, buffer);
689
690 if (size < buffer_size) {
691 best_fit = n;
692 n = n->rb_left;
693 } else if (size > buffer_size)
694 n = n->rb_right;
695 else {
696 best_fit = n;
697 break;
698 }
699 }
700 if (best_fit == NULL) {
701 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
702 proc->pid, size);
703 return NULL;
704 }
705 if (n == NULL) {
706 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
707 buffer_size = binder_buffer_size(proc, buffer);
708 }
709
710 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
711 "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
712 proc->pid, size, buffer, buffer_size);
713
714 has_page_addr =
715 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
716 if (n == NULL) {
717 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
718 buffer_size = size; /* no room for other buffers */
719 else
720 buffer_size = size + sizeof(struct binder_buffer);
721 }
722 end_page_addr =
723 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
724 if (end_page_addr > has_page_addr)
725 end_page_addr = has_page_addr;
726 if (binder_update_page_range(proc, 1,
727 (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
728 return NULL;
729
730 rb_erase(best_fit, &proc->free_buffers);
731 buffer->free = 0;
732 binder_insert_allocated_buffer(proc, buffer);
733 if (buffer_size != size) {
734 struct binder_buffer *new_buffer = (void *)buffer->data + size;
735
736 list_add(&new_buffer->entry, &buffer->entry);
737 new_buffer->free = 1;
738 binder_insert_free_buffer(proc, new_buffer);
739 }
740 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
741 "%d: binder_alloc_buf size %zd got %p\n",
742 proc->pid, size, buffer);
743 buffer->data_size = data_size;
744 buffer->offsets_size = offsets_size;
745 buffer->async_transaction = is_async;
746 if (is_async) {
747 proc->free_async_space -= size + sizeof(struct binder_buffer);
748 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
749 "%d: binder_alloc_buf size %zd async free %zd\n",
750 proc->pid, size, proc->free_async_space);
751 }
752
753 return buffer;
754 }
755
756 static void *buffer_start_page(struct binder_buffer *buffer)
757 {
758 return (void *)((uintptr_t)buffer & PAGE_MASK);
759 }
760
761 static void *buffer_end_page(struct binder_buffer *buffer)
762 {
763 return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
764 }
765
766 static void binder_delete_free_buffer(struct binder_proc *proc,
767 struct binder_buffer *buffer)
768 {
769 struct binder_buffer *prev, *next = NULL;
770 int free_page_end = 1;
771 int free_page_start = 1;
772
773 BUG_ON(proc->buffers.next == &buffer->entry);
774 prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
775 BUG_ON(!prev->free);
776 if (buffer_end_page(prev) == buffer_start_page(buffer)) {
777 free_page_start = 0;
778 if (buffer_end_page(prev) == buffer_end_page(buffer))
779 free_page_end = 0;
780 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
781 "%d: merge free, buffer %p share page with %p\n",
782 proc->pid, buffer, prev);
783 }
784
785 if (!list_is_last(&buffer->entry, &proc->buffers)) {
786 next = list_entry(buffer->entry.next,
787 struct binder_buffer, entry);
788 if (buffer_start_page(next) == buffer_end_page(buffer)) {
789 free_page_end = 0;
790 if (buffer_start_page(next) ==
791 buffer_start_page(buffer))
792 free_page_start = 0;
793 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
794 "%d: merge free, buffer %p share page with %p\n",
795 proc->pid, buffer, prev);
796 }
797 }
798 list_del(&buffer->entry);
799 if (free_page_start || free_page_end) {
800 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
801 "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
802 proc->pid, buffer, free_page_start ? "" : " end",
803 free_page_end ? "" : " start", prev, next);
804 binder_update_page_range(proc, 0, free_page_start ?
805 buffer_start_page(buffer) : buffer_end_page(buffer),
806 (free_page_end ? buffer_end_page(buffer) :
807 buffer_start_page(buffer)) + PAGE_SIZE, NULL);
808 }
809 }
810
811 static void binder_free_buf(struct binder_proc *proc,
812 struct binder_buffer *buffer)
813 {
814 size_t size, buffer_size;
815
816 buffer_size = binder_buffer_size(proc, buffer);
817
818 size = ALIGN(buffer->data_size, sizeof(void *)) +
819 ALIGN(buffer->offsets_size, sizeof(void *));
820
821 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
822 "%d: binder_free_buf %p size %zd buffer_size %zd\n",
823 proc->pid, buffer, size, buffer_size);
824
825 BUG_ON(buffer->free);
826 BUG_ON(size > buffer_size);
827 BUG_ON(buffer->transaction != NULL);
828 BUG_ON((void *)buffer < proc->buffer);
829 BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
830
831 if (buffer->async_transaction) {
832 proc->free_async_space += size + sizeof(struct binder_buffer);
833
834 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
835 "%d: binder_free_buf size %zd async free %zd\n",
836 proc->pid, size, proc->free_async_space);
837 }
838
839 binder_update_page_range(proc, 0,
840 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
841 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
842 NULL);
843 rb_erase(&buffer->rb_node, &proc->allocated_buffers);
844 buffer->free = 1;
845 if (!list_is_last(&buffer->entry, &proc->buffers)) {
846 struct binder_buffer *next = list_entry(buffer->entry.next,
847 struct binder_buffer, entry);
848
849 if (next->free) {
850 rb_erase(&next->rb_node, &proc->free_buffers);
851 binder_delete_free_buffer(proc, next);
852 }
853 }
854 if (proc->buffers.next != &buffer->entry) {
855 struct binder_buffer *prev = list_entry(buffer->entry.prev,
856 struct binder_buffer, entry);
857
858 if (prev->free) {
859 binder_delete_free_buffer(proc, buffer);
860 rb_erase(&prev->rb_node, &proc->free_buffers);
861 buffer = prev;
862 }
863 }
864 binder_insert_free_buffer(proc, buffer);
865 }
866
867 static struct binder_node *binder_get_node(struct binder_proc *proc,
868 binder_uintptr_t ptr)
869 {
870 struct rb_node *n = proc->nodes.rb_node;
871 struct binder_node *node;
872
873 while (n) {
874 node = rb_entry(n, struct binder_node, rb_node);
875
876 if (ptr < node->ptr)
877 n = n->rb_left;
878 else if (ptr > node->ptr)
879 n = n->rb_right;
880 else
881 return node;
882 }
883 return NULL;
884 }
885
886 static struct binder_node *binder_new_node(struct binder_proc *proc,
887 binder_uintptr_t ptr,
888 binder_uintptr_t cookie)
889 {
890 struct rb_node **p = &proc->nodes.rb_node;
891 struct rb_node *parent = NULL;
892 struct binder_node *node;
893
894 while (*p) {
895 parent = *p;
896 node = rb_entry(parent, struct binder_node, rb_node);
897
898 if (ptr < node->ptr)
899 p = &(*p)->rb_left;
900 else if (ptr > node->ptr)
901 p = &(*p)->rb_right;
902 else
903 return NULL;
904 }
905
906 node = kzalloc(sizeof(*node), GFP_KERNEL);
907 if (node == NULL)
908 return NULL;
909 binder_stats_created(BINDER_STAT_NODE);
910 rb_link_node(&node->rb_node, parent, p);
911 rb_insert_color(&node->rb_node, &proc->nodes);
912 node->debug_id = ++binder_last_id;
913 node->proc = proc;
914 node->ptr = ptr;
915 node->cookie = cookie;
916 node->work.type = BINDER_WORK_NODE;
917 INIT_LIST_HEAD(&node->work.entry);
918 INIT_LIST_HEAD(&node->async_todo);
919 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
920 "%d:%d node %d u%016llx c%016llx created\n",
921 proc->pid, current->pid, node->debug_id,
922 (u64)node->ptr, (u64)node->cookie);
923 return node;
924 }
925
926 static int binder_inc_node(struct binder_node *node, int strong, int internal,
927 struct list_head *target_list)
928 {
929 if (strong) {
930 if (internal) {
931 if (target_list == NULL &&
932 node->internal_strong_refs == 0 &&
933 !(node == binder_context_mgr_node &&
934 node->has_strong_ref)) {
935 pr_err("invalid inc strong node for %d\n",
936 node->debug_id);
937 return -EINVAL;
938 }
939 node->internal_strong_refs++;
940 } else
941 node->local_strong_refs++;
942 if (!node->has_strong_ref && target_list) {
943 list_del_init(&node->work.entry);
944 list_add_tail(&node->work.entry, target_list);
945 }
946 } else {
947 if (!internal)
948 node->local_weak_refs++;
949 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
950 if (target_list == NULL) {
951 pr_err("invalid inc weak node for %d\n",
952 node->debug_id);
953 return -EINVAL;
954 }
955 list_add_tail(&node->work.entry, target_list);
956 }
957 }
958 return 0;
959 }
960
961 static int binder_dec_node(struct binder_node *node, int strong, int internal)
962 {
963 if (strong) {
964 if (internal)
965 node->internal_strong_refs--;
966 else
967 node->local_strong_refs--;
968 if (node->local_strong_refs || node->internal_strong_refs)
969 return 0;
970 } else {
971 if (!internal)
972 node->local_weak_refs--;
973 if (node->local_weak_refs || !hlist_empty(&node->refs))
974 return 0;
975 }
976 if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
977 if (list_empty(&node->work.entry)) {
978 list_add_tail(&node->work.entry, &node->proc->todo);
979 wake_up_interruptible(&node->proc->wait);
980 }
981 } else {
982 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
983 !node->local_weak_refs) {
984 list_del_init(&node->work.entry);
985 if (node->proc) {
986 rb_erase(&node->rb_node, &node->proc->nodes);
987 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
988 "refless node %d deleted\n",
989 node->debug_id);
990 } else {
991 hlist_del(&node->dead_node);
992 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
993 "dead node %d deleted\n",
994 node->debug_id);
995 }
996 kfree(node);
997 binder_stats_deleted(BINDER_STAT_NODE);
998 }
999 }
1000
1001 return 0;
1002 }
1003
1004
1005 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1006 uint32_t desc)
1007 {
1008 struct rb_node *n = proc->refs_by_desc.rb_node;
1009 struct binder_ref *ref;
1010
1011 while (n) {
1012 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1013
1014 if (desc < ref->desc)
1015 n = n->rb_left;
1016 else if (desc > ref->desc)
1017 n = n->rb_right;
1018 else
1019 return ref;
1020 }
1021 return NULL;
1022 }
1023
1024 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1025 struct binder_node *node)
1026 {
1027 struct rb_node *n;
1028 struct rb_node **p = &proc->refs_by_node.rb_node;
1029 struct rb_node *parent = NULL;
1030 struct binder_ref *ref, *new_ref;
1031
1032 while (*p) {
1033 parent = *p;
1034 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1035
1036 if (node < ref->node)
1037 p = &(*p)->rb_left;
1038 else if (node > ref->node)
1039 p = &(*p)->rb_right;
1040 else
1041 return ref;
1042 }
1043 new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1044 if (new_ref == NULL)
1045 return NULL;
1046 binder_stats_created(BINDER_STAT_REF);
1047 new_ref->debug_id = ++binder_last_id;
1048 new_ref->proc = proc;
1049 new_ref->node = node;
1050 rb_link_node(&new_ref->rb_node_node, parent, p);
1051 rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1052
1053 new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1054 for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1055 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1056 if (ref->desc > new_ref->desc)
1057 break;
1058 new_ref->desc = ref->desc + 1;
1059 }
1060
1061 p = &proc->refs_by_desc.rb_node;
1062 while (*p) {
1063 parent = *p;
1064 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1065
1066 if (new_ref->desc < ref->desc)
1067 p = &(*p)->rb_left;
1068 else if (new_ref->desc > ref->desc)
1069 p = &(*p)->rb_right;
1070 else
1071 BUG();
1072 }
1073 rb_link_node(&new_ref->rb_node_desc, parent, p);
1074 rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1075 if (node) {
1076 hlist_add_head(&new_ref->node_entry, &node->refs);
1077
1078 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1079 "%d new ref %d desc %d for node %d\n",
1080 proc->pid, new_ref->debug_id, new_ref->desc,
1081 node->debug_id);
1082 } else {
1083 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1084 "%d new ref %d desc %d for dead node\n",
1085 proc->pid, new_ref->debug_id, new_ref->desc);
1086 }
1087 return new_ref;
1088 }
1089
1090 static void binder_delete_ref(struct binder_ref *ref)
1091 {
1092 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1093 "%d delete ref %d desc %d for node %d\n",
1094 ref->proc->pid, ref->debug_id, ref->desc,
1095 ref->node->debug_id);
1096
1097 rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1098 rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1099 if (ref->strong)
1100 binder_dec_node(ref->node, 1, 1);
1101 hlist_del(&ref->node_entry);
1102 binder_dec_node(ref->node, 0, 1);
1103 if (ref->death) {
1104 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1105 "%d delete ref %d desc %d has death notification\n",
1106 ref->proc->pid, ref->debug_id, ref->desc);
1107 list_del(&ref->death->work.entry);
1108 kfree(ref->death);
1109 binder_stats_deleted(BINDER_STAT_DEATH);
1110 }
1111 kfree(ref);
1112 binder_stats_deleted(BINDER_STAT_REF);
1113 }
1114
1115 static int binder_inc_ref(struct binder_ref *ref, int strong,
1116 struct list_head *target_list)
1117 {
1118 int ret;
1119
1120 if (strong) {
1121 if (ref->strong == 0) {
1122 ret = binder_inc_node(ref->node, 1, 1, target_list);
1123 if (ret)
1124 return ret;
1125 }
1126 ref->strong++;
1127 } else {
1128 if (ref->weak == 0) {
1129 ret = binder_inc_node(ref->node, 0, 1, target_list);
1130 if (ret)
1131 return ret;
1132 }
1133 ref->weak++;
1134 }
1135 return 0;
1136 }
1137
1138
1139 static int binder_dec_ref(struct binder_ref *ref, int strong)
1140 {
1141 if (strong) {
1142 if (ref->strong == 0) {
1143 binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1144 ref->proc->pid, ref->debug_id,
1145 ref->desc, ref->strong, ref->weak);
1146 return -EINVAL;
1147 }
1148 ref->strong--;
1149 if (ref->strong == 0) {
1150 int ret;
1151
1152 ret = binder_dec_node(ref->node, strong, 1);
1153 if (ret)
1154 return ret;
1155 }
1156 } else {
1157 if (ref->weak == 0) {
1158 binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1159 ref->proc->pid, ref->debug_id,
1160 ref->desc, ref->strong, ref->weak);
1161 return -EINVAL;
1162 }
1163 ref->weak--;
1164 }
1165 if (ref->strong == 0 && ref->weak == 0)
1166 binder_delete_ref(ref);
1167 return 0;
1168 }
1169
1170 static void binder_pop_transaction(struct binder_thread *target_thread,
1171 struct binder_transaction *t)
1172 {
1173 if (target_thread) {
1174 BUG_ON(target_thread->transaction_stack != t);
1175 BUG_ON(target_thread->transaction_stack->from != target_thread);
1176 target_thread->transaction_stack =
1177 target_thread->transaction_stack->from_parent;
1178 t->from = NULL;
1179 }
1180 t->need_reply = 0;
1181 if (t->buffer)
1182 t->buffer->transaction = NULL;
1183 kfree(t);
1184 binder_stats_deleted(BINDER_STAT_TRANSACTION);
1185 }
1186
1187 static void binder_send_failed_reply(struct binder_transaction *t,
1188 uint32_t error_code)
1189 {
1190 struct binder_thread *target_thread;
1191 struct binder_transaction *next;
1192
1193 BUG_ON(t->flags & TF_ONE_WAY);
1194 while (1) {
1195 target_thread = t->from;
1196 if (target_thread) {
1197 if (target_thread->return_error != BR_OK &&
1198 target_thread->return_error2 == BR_OK) {
1199 target_thread->return_error2 =
1200 target_thread->return_error;
1201 target_thread->return_error = BR_OK;
1202 }
1203 if (target_thread->return_error == BR_OK) {
1204 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1205 "send failed reply for transaction %d to %d:%d\n",
1206 t->debug_id,
1207 target_thread->proc->pid,
1208 target_thread->pid);
1209
1210 binder_pop_transaction(target_thread, t);
1211 target_thread->return_error = error_code;
1212 wake_up_interruptible(&target_thread->wait);
1213 } else {
1214 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1215 target_thread->proc->pid,
1216 target_thread->pid,
1217 target_thread->return_error);
1218 }
1219 return;
1220 }
1221 next = t->from_parent;
1222
1223 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1224 "send failed reply for transaction %d, target dead\n",
1225 t->debug_id);
1226
1227 binder_pop_transaction(target_thread, t);
1228 if (next == NULL) {
1229 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1230 "reply failed, no target thread at root\n");
1231 return;
1232 }
1233 t = next;
1234 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1235 "reply failed, no target thread -- retry %d\n",
1236 t->debug_id);
1237 }
1238 }
1239
1240 static void binder_transaction_buffer_release(struct binder_proc *proc,
1241 struct binder_buffer *buffer,
1242 binder_size_t *failed_at)
1243 {
1244 binder_size_t *offp, *off_end;
1245 int debug_id = buffer->debug_id;
1246
1247 binder_debug(BINDER_DEBUG_TRANSACTION,
1248 "%d buffer release %d, size %zd-%zd, failed at %p\n",
1249 proc->pid, buffer->debug_id,
1250 buffer->data_size, buffer->offsets_size, failed_at);
1251
1252 if (buffer->target_node)
1253 binder_dec_node(buffer->target_node, 1, 0);
1254
1255 offp = (binder_size_t *)(buffer->data +
1256 ALIGN(buffer->data_size, sizeof(void *)));
1257 if (failed_at)
1258 off_end = failed_at;
1259 else
1260 off_end = (void *)offp + buffer->offsets_size;
1261 for (; offp < off_end; offp++) {
1262 struct flat_binder_object *fp;
1263
1264 if (*offp > buffer->data_size - sizeof(*fp) ||
1265 buffer->data_size < sizeof(*fp) ||
1266 !IS_ALIGNED(*offp, sizeof(u32))) {
1267 pr_err("transaction release %d bad offset %lld, size %zd\n",
1268 debug_id, (u64)*offp, buffer->data_size);
1269 continue;
1270 }
1271 fp = (struct flat_binder_object *)(buffer->data + *offp);
1272 switch (fp->type) {
1273 case BINDER_TYPE_BINDER:
1274 case BINDER_TYPE_WEAK_BINDER: {
1275 struct binder_node *node = binder_get_node(proc, fp->binder);
1276
1277 if (node == NULL) {
1278 pr_err("transaction release %d bad node %016llx\n",
1279 debug_id, (u64)fp->binder);
1280 break;
1281 }
1282 binder_debug(BINDER_DEBUG_TRANSACTION,
1283 " node %d u%016llx\n",
1284 node->debug_id, (u64)node->ptr);
1285 binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1286 } break;
1287 case BINDER_TYPE_HANDLE:
1288 case BINDER_TYPE_WEAK_HANDLE: {
1289 struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1290
1291 if (ref == NULL) {
1292 pr_err("transaction release %d bad handle %d\n",
1293 debug_id, fp->handle);
1294 break;
1295 }
1296 binder_debug(BINDER_DEBUG_TRANSACTION,
1297 " ref %d desc %d (node %d)\n",
1298 ref->debug_id, ref->desc, ref->node->debug_id);
1299 binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1300 } break;
1301
1302 case BINDER_TYPE_FD:
1303 binder_debug(BINDER_DEBUG_TRANSACTION,
1304 " fd %d\n", fp->handle);
1305 if (failed_at)
1306 task_close_fd(proc, fp->handle);
1307 break;
1308
1309 default:
1310 pr_err("transaction release %d bad object type %x\n",
1311 debug_id, fp->type);
1312 break;
1313 }
1314 }
1315 }
1316
1317 static void binder_transaction(struct binder_proc *proc,
1318 struct binder_thread *thread,
1319 struct binder_transaction_data *tr, int reply)
1320 {
1321 struct binder_transaction *t;
1322 struct binder_work *tcomplete;
1323 binder_size_t *offp, *off_end;
1324 struct binder_proc *target_proc;
1325 struct binder_thread *target_thread = NULL;
1326 struct binder_node *target_node = NULL;
1327 struct list_head *target_list;
1328 wait_queue_head_t *target_wait;
1329 struct binder_transaction *in_reply_to = NULL;
1330 struct binder_transaction_log_entry *e;
1331 uint32_t return_error;
1332
1333 e = binder_transaction_log_add(&binder_transaction_log);
1334 e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1335 e->from_proc = proc->pid;
1336 e->from_thread = thread->pid;
1337 e->target_handle = tr->target.handle;
1338 e->data_size = tr->data_size;
1339 e->offsets_size = tr->offsets_size;
1340
1341 if (reply) {
1342 in_reply_to = thread->transaction_stack;
1343 if (in_reply_to == NULL) {
1344 binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1345 proc->pid, thread->pid);
1346 return_error = BR_FAILED_REPLY;
1347 goto err_empty_call_stack;
1348 }
1349 binder_set_nice(in_reply_to->saved_priority);
1350 if (in_reply_to->to_thread != thread) {
1351 binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1352 proc->pid, thread->pid, in_reply_to->debug_id,
1353 in_reply_to->to_proc ?
1354 in_reply_to->to_proc->pid : 0,
1355 in_reply_to->to_thread ?
1356 in_reply_to->to_thread->pid : 0);
1357 return_error = BR_FAILED_REPLY;
1358 in_reply_to = NULL;
1359 goto err_bad_call_stack;
1360 }
1361 thread->transaction_stack = in_reply_to->to_parent;
1362 target_thread = in_reply_to->from;
1363 if (target_thread == NULL) {
1364 return_error = BR_DEAD_REPLY;
1365 goto err_dead_binder;
1366 }
1367 if (target_thread->transaction_stack != in_reply_to) {
1368 binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1369 proc->pid, thread->pid,
1370 target_thread->transaction_stack ?
1371 target_thread->transaction_stack->debug_id : 0,
1372 in_reply_to->debug_id);
1373 return_error = BR_FAILED_REPLY;
1374 in_reply_to = NULL;
1375 target_thread = NULL;
1376 goto err_dead_binder;
1377 }
1378 target_proc = target_thread->proc;
1379 } else {
1380 if (tr->target.handle) {
1381 struct binder_ref *ref;
1382
1383 ref = binder_get_ref(proc, tr->target.handle);
1384 if (ref == NULL) {
1385 binder_user_error("%d:%d got transaction to invalid handle\n",
1386 proc->pid, thread->pid);
1387 return_error = BR_FAILED_REPLY;
1388 goto err_invalid_target_handle;
1389 }
1390 target_node = ref->node;
1391 } else {
1392 target_node = binder_context_mgr_node;
1393 if (target_node == NULL) {
1394 return_error = BR_DEAD_REPLY;
1395 goto err_no_context_mgr_node;
1396 }
1397 }
1398 e->to_node = target_node->debug_id;
1399 target_proc = target_node->proc;
1400 if (target_proc == NULL) {
1401 return_error = BR_DEAD_REPLY;
1402 goto err_dead_binder;
1403 }
1404 if (security_binder_transaction(proc->tsk,
1405 target_proc->tsk) < 0) {
1406 return_error = BR_FAILED_REPLY;
1407 goto err_invalid_target_handle;
1408 }
1409 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1410 struct binder_transaction *tmp;
1411
1412 tmp = thread->transaction_stack;
1413 if (tmp->to_thread != thread) {
1414 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1415 proc->pid, thread->pid, tmp->debug_id,
1416 tmp->to_proc ? tmp->to_proc->pid : 0,
1417 tmp->to_thread ?
1418 tmp->to_thread->pid : 0);
1419 return_error = BR_FAILED_REPLY;
1420 goto err_bad_call_stack;
1421 }
1422 while (tmp) {
1423 if (tmp->from && tmp->from->proc == target_proc)
1424 target_thread = tmp->from;
1425 tmp = tmp->from_parent;
1426 }
1427 }
1428 }
1429 if (target_thread) {
1430 e->to_thread = target_thread->pid;
1431 target_list = &target_thread->todo;
1432 target_wait = &target_thread->wait;
1433 } else {
1434 target_list = &target_proc->todo;
1435 target_wait = &target_proc->wait;
1436 }
1437 e->to_proc = target_proc->pid;
1438
1439 /* TODO: reuse incoming transaction for reply */
1440 t = kzalloc(sizeof(*t), GFP_KERNEL);
1441 if (t == NULL) {
1442 return_error = BR_FAILED_REPLY;
1443 goto err_alloc_t_failed;
1444 }
1445 binder_stats_created(BINDER_STAT_TRANSACTION);
1446
1447 tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1448 if (tcomplete == NULL) {
1449 return_error = BR_FAILED_REPLY;
1450 goto err_alloc_tcomplete_failed;
1451 }
1452 binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1453
1454 t->debug_id = ++binder_last_id;
1455 e->debug_id = t->debug_id;
1456
1457 if (reply)
1458 binder_debug(BINDER_DEBUG_TRANSACTION,
1459 "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld\n",
1460 proc->pid, thread->pid, t->debug_id,
1461 target_proc->pid, target_thread->pid,
1462 (u64)tr->data.ptr.buffer,
1463 (u64)tr->data.ptr.offsets,
1464 (u64)tr->data_size, (u64)tr->offsets_size);
1465 else
1466 binder_debug(BINDER_DEBUG_TRANSACTION,
1467 "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld\n",
1468 proc->pid, thread->pid, t->debug_id,
1469 target_proc->pid, target_node->debug_id,
1470 (u64)tr->data.ptr.buffer,
1471 (u64)tr->data.ptr.offsets,
1472 (u64)tr->data_size, (u64)tr->offsets_size);
1473
1474 if (!reply && !(tr->flags & TF_ONE_WAY))
1475 t->from = thread;
1476 else
1477 t->from = NULL;
1478 t->sender_euid = task_euid(proc->tsk);
1479 t->to_proc = target_proc;
1480 t->to_thread = target_thread;
1481 t->code = tr->code;
1482 t->flags = tr->flags;
1483 t->priority = task_nice(current);
1484
1485 trace_binder_transaction(reply, t, target_node);
1486
1487 t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1488 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1489 if (t->buffer == NULL) {
1490 return_error = BR_FAILED_REPLY;
1491 goto err_binder_alloc_buf_failed;
1492 }
1493 t->buffer->allow_user_free = 0;
1494 t->buffer->debug_id = t->debug_id;
1495 t->buffer->transaction = t;
1496 t->buffer->target_node = target_node;
1497 trace_binder_transaction_alloc_buf(t->buffer);
1498 if (target_node)
1499 binder_inc_node(target_node, 1, 0, NULL);
1500
1501 offp = (binder_size_t *)(t->buffer->data +
1502 ALIGN(tr->data_size, sizeof(void *)));
1503
1504 if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
1505 tr->data.ptr.buffer, tr->data_size)) {
1506 binder_user_error("%d:%d got transaction with invalid data ptr\n",
1507 proc->pid, thread->pid);
1508 return_error = BR_FAILED_REPLY;
1509 goto err_copy_data_failed;
1510 }
1511 if (copy_from_user(offp, (const void __user *)(uintptr_t)
1512 tr->data.ptr.offsets, tr->offsets_size)) {
1513 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1514 proc->pid, thread->pid);
1515 return_error = BR_FAILED_REPLY;
1516 goto err_copy_data_failed;
1517 }
1518 if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
1519 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
1520 proc->pid, thread->pid, (u64)tr->offsets_size);
1521 return_error = BR_FAILED_REPLY;
1522 goto err_bad_offset;
1523 }
1524 off_end = (void *)offp + tr->offsets_size;
1525 for (; offp < off_end; offp++) {
1526 struct flat_binder_object *fp;
1527
1528 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1529 t->buffer->data_size < sizeof(*fp) ||
1530 !IS_ALIGNED(*offp, sizeof(u32))) {
1531 binder_user_error("%d:%d got transaction with invalid offset, %lld\n",
1532 proc->pid, thread->pid, (u64)*offp);
1533 return_error = BR_FAILED_REPLY;
1534 goto err_bad_offset;
1535 }
1536 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1537 switch (fp->type) {
1538 case BINDER_TYPE_BINDER:
1539 case BINDER_TYPE_WEAK_BINDER: {
1540 struct binder_ref *ref;
1541 struct binder_node *node = binder_get_node(proc, fp->binder);
1542
1543 if (node == NULL) {
1544 node = binder_new_node(proc, fp->binder, fp->cookie);
1545 if (node == NULL) {
1546 return_error = BR_FAILED_REPLY;
1547 goto err_binder_new_node_failed;
1548 }
1549 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1550 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1551 }
1552 if (fp->cookie != node->cookie) {
1553 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1554 proc->pid, thread->pid,
1555 (u64)fp->binder, node->debug_id,
1556 (u64)fp->cookie, (u64)node->cookie);
1557 return_error = BR_FAILED_REPLY;
1558 goto err_binder_get_ref_for_node_failed;
1559 }
1560 if (security_binder_transfer_binder(proc->tsk,
1561 target_proc->tsk)) {
1562 return_error = BR_FAILED_REPLY;
1563 goto err_binder_get_ref_for_node_failed;
1564 }
1565 ref = binder_get_ref_for_node(target_proc, node);
1566 if (ref == NULL) {
1567 return_error = BR_FAILED_REPLY;
1568 goto err_binder_get_ref_for_node_failed;
1569 }
1570 if (fp->type == BINDER_TYPE_BINDER)
1571 fp->type = BINDER_TYPE_HANDLE;
1572 else
1573 fp->type = BINDER_TYPE_WEAK_HANDLE;
1574 fp->handle = ref->desc;
1575 binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1576 &thread->todo);
1577
1578 trace_binder_transaction_node_to_ref(t, node, ref);
1579 binder_debug(BINDER_DEBUG_TRANSACTION,
1580 " node %d u%016llx -> ref %d desc %d\n",
1581 node->debug_id, (u64)node->ptr,
1582 ref->debug_id, ref->desc);
1583 } break;
1584 case BINDER_TYPE_HANDLE:
1585 case BINDER_TYPE_WEAK_HANDLE: {
1586 struct binder_ref *ref = binder_get_ref(proc, fp->handle);
1587
1588 if (ref == NULL) {
1589 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1590 proc->pid,
1591 thread->pid, fp->handle);
1592 return_error = BR_FAILED_REPLY;
1593 goto err_binder_get_ref_failed;
1594 }
1595 if (security_binder_transfer_binder(proc->tsk,
1596 target_proc->tsk)) {
1597 return_error = BR_FAILED_REPLY;
1598 goto err_binder_get_ref_failed;
1599 }
1600 if (ref->node->proc == target_proc) {
1601 if (fp->type == BINDER_TYPE_HANDLE)
1602 fp->type = BINDER_TYPE_BINDER;
1603 else
1604 fp->type = BINDER_TYPE_WEAK_BINDER;
1605 fp->binder = ref->node->ptr;
1606 fp->cookie = ref->node->cookie;
1607 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1608 trace_binder_transaction_ref_to_node(t, ref);
1609 binder_debug(BINDER_DEBUG_TRANSACTION,
1610 " ref %d desc %d -> node %d u%016llx\n",
1611 ref->debug_id, ref->desc, ref->node->debug_id,
1612 (u64)ref->node->ptr);
1613 } else {
1614 struct binder_ref *new_ref;
1615
1616 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1617 if (new_ref == NULL) {
1618 return_error = BR_FAILED_REPLY;
1619 goto err_binder_get_ref_for_node_failed;
1620 }
1621 fp->handle = new_ref->desc;
1622 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1623 trace_binder_transaction_ref_to_ref(t, ref,
1624 new_ref);
1625 binder_debug(BINDER_DEBUG_TRANSACTION,
1626 " ref %d desc %d -> ref %d desc %d (node %d)\n",
1627 ref->debug_id, ref->desc, new_ref->debug_id,
1628 new_ref->desc, ref->node->debug_id);
1629 }
1630 } break;
1631
1632 case BINDER_TYPE_FD: {
1633 int target_fd;
1634 struct file *file;
1635
1636 if (reply) {
1637 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1638 binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1639 proc->pid, thread->pid, fp->handle);
1640 return_error = BR_FAILED_REPLY;
1641 goto err_fd_not_allowed;
1642 }
1643 } else if (!target_node->accept_fds) {
1644 binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1645 proc->pid, thread->pid, fp->handle);
1646 return_error = BR_FAILED_REPLY;
1647 goto err_fd_not_allowed;
1648 }
1649
1650 file = fget(fp->handle);
1651 if (file == NULL) {
1652 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1653 proc->pid, thread->pid, fp->handle);
1654 return_error = BR_FAILED_REPLY;
1655 goto err_fget_failed;
1656 }
1657 if (security_binder_transfer_file(proc->tsk,
1658 target_proc->tsk,
1659 file) < 0) {
1660 fput(file);
1661 return_error = BR_FAILED_REPLY;
1662 goto err_get_unused_fd_failed;
1663 }
1664 target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1665 if (target_fd < 0) {
1666 fput(file);
1667 return_error = BR_FAILED_REPLY;
1668 goto err_get_unused_fd_failed;
1669 }
1670 task_fd_install(target_proc, target_fd, file);
1671 trace_binder_transaction_fd(t, fp->handle, target_fd);
1672 binder_debug(BINDER_DEBUG_TRANSACTION,
1673 " fd %d -> %d\n", fp->handle, target_fd);
1674 /* TODO: fput? */
1675 fp->handle = target_fd;
1676 } break;
1677
1678 default:
1679 binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1680 proc->pid, thread->pid, fp->type);
1681 return_error = BR_FAILED_REPLY;
1682 goto err_bad_object_type;
1683 }
1684 }
1685 if (reply) {
1686 BUG_ON(t->buffer->async_transaction != 0);
1687 binder_pop_transaction(target_thread, in_reply_to);
1688 } else if (!(t->flags & TF_ONE_WAY)) {
1689 BUG_ON(t->buffer->async_transaction != 0);
1690 t->need_reply = 1;
1691 t->from_parent = thread->transaction_stack;
1692 thread->transaction_stack = t;
1693 } else {
1694 BUG_ON(target_node == NULL);
1695 BUG_ON(t->buffer->async_transaction != 1);
1696 if (target_node->has_async_transaction) {
1697 target_list = &target_node->async_todo;
1698 target_wait = NULL;
1699 } else
1700 target_node->has_async_transaction = 1;
1701 }
1702 t->work.type = BINDER_WORK_TRANSACTION;
1703 list_add_tail(&t->work.entry, target_list);
1704 tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1705 list_add_tail(&tcomplete->entry, &thread->todo);
1706 if (target_wait)
1707 wake_up_interruptible(target_wait);
1708 return;
1709
1710 err_get_unused_fd_failed:
1711 err_fget_failed:
1712 err_fd_not_allowed:
1713 err_binder_get_ref_for_node_failed:
1714 err_binder_get_ref_failed:
1715 err_binder_new_node_failed:
1716 err_bad_object_type:
1717 err_bad_offset:
1718 err_copy_data_failed:
1719 trace_binder_transaction_failed_buffer_release(t->buffer);
1720 binder_transaction_buffer_release(target_proc, t->buffer, offp);
1721 t->buffer->transaction = NULL;
1722 binder_free_buf(target_proc, t->buffer);
1723 err_binder_alloc_buf_failed:
1724 kfree(tcomplete);
1725 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1726 err_alloc_tcomplete_failed:
1727 kfree(t);
1728 binder_stats_deleted(BINDER_STAT_TRANSACTION);
1729 err_alloc_t_failed:
1730 err_bad_call_stack:
1731 err_empty_call_stack:
1732 err_dead_binder:
1733 err_invalid_target_handle:
1734 err_no_context_mgr_node:
1735 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1736 "%d:%d transaction failed %d, size %lld-%lld\n",
1737 proc->pid, thread->pid, return_error,
1738 (u64)tr->data_size, (u64)tr->offsets_size);
1739
1740 {
1741 struct binder_transaction_log_entry *fe;
1742
1743 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1744 *fe = *e;
1745 }
1746
1747 BUG_ON(thread->return_error != BR_OK);
1748 if (in_reply_to) {
1749 thread->return_error = BR_TRANSACTION_COMPLETE;
1750 binder_send_failed_reply(in_reply_to, return_error);
1751 } else
1752 thread->return_error = return_error;
1753 }
1754
1755 static int binder_thread_write(struct binder_proc *proc,
1756 struct binder_thread *thread,
1757 binder_uintptr_t binder_buffer, size_t size,
1758 binder_size_t *consumed)
1759 {
1760 uint32_t cmd;
1761 void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
1762 void __user *ptr = buffer + *consumed;
1763 void __user *end = buffer + size;
1764
1765 while (ptr < end && thread->return_error == BR_OK) {
1766 if (get_user(cmd, (uint32_t __user *)ptr))
1767 return -EFAULT;
1768 ptr += sizeof(uint32_t);
1769 trace_binder_command(cmd);
1770 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1771 binder_stats.bc[_IOC_NR(cmd)]++;
1772 proc->stats.bc[_IOC_NR(cmd)]++;
1773 thread->stats.bc[_IOC_NR(cmd)]++;
1774 }
1775 switch (cmd) {
1776 case BC_INCREFS:
1777 case BC_ACQUIRE:
1778 case BC_RELEASE:
1779 case BC_DECREFS: {
1780 uint32_t target;
1781 struct binder_ref *ref;
1782 const char *debug_string;
1783
1784 if (get_user(target, (uint32_t __user *)ptr))
1785 return -EFAULT;
1786 ptr += sizeof(uint32_t);
1787 if (target == 0 && binder_context_mgr_node &&
1788 (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1789 ref = binder_get_ref_for_node(proc,
1790 binder_context_mgr_node);
1791 if (ref->desc != target) {
1792 binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1793 proc->pid, thread->pid,
1794 ref->desc);
1795 }
1796 } else
1797 ref = binder_get_ref(proc, target);
1798 if (ref == NULL) {
1799 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1800 proc->pid, thread->pid, target);
1801 break;
1802 }
1803 switch (cmd) {
1804 case BC_INCREFS:
1805 debug_string = "IncRefs";
1806 binder_inc_ref(ref, 0, NULL);
1807 break;
1808 case BC_ACQUIRE:
1809 debug_string = "Acquire";
1810 binder_inc_ref(ref, 1, NULL);
1811 break;
1812 case BC_RELEASE:
1813 debug_string = "Release";
1814 binder_dec_ref(ref, 1);
1815 break;
1816 case BC_DECREFS:
1817 default:
1818 debug_string = "DecRefs";
1819 binder_dec_ref(ref, 0);
1820 break;
1821 }
1822 binder_debug(BINDER_DEBUG_USER_REFS,
1823 "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1824 proc->pid, thread->pid, debug_string, ref->debug_id,
1825 ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1826 break;
1827 }
1828 case BC_INCREFS_DONE:
1829 case BC_ACQUIRE_DONE: {
1830 binder_uintptr_t node_ptr;
1831 binder_uintptr_t cookie;
1832 struct binder_node *node;
1833
1834 if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
1835 return -EFAULT;
1836 ptr += sizeof(binder_uintptr_t);
1837 if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1838 return -EFAULT;
1839 ptr += sizeof(binder_uintptr_t);
1840 node = binder_get_node(proc, node_ptr);
1841 if (node == NULL) {
1842 binder_user_error("%d:%d %s u%016llx no match\n",
1843 proc->pid, thread->pid,
1844 cmd == BC_INCREFS_DONE ?
1845 "BC_INCREFS_DONE" :
1846 "BC_ACQUIRE_DONE",
1847 (u64)node_ptr);
1848 break;
1849 }
1850 if (cookie != node->cookie) {
1851 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
1852 proc->pid, thread->pid,
1853 cmd == BC_INCREFS_DONE ?
1854 "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1855 (u64)node_ptr, node->debug_id,
1856 (u64)cookie, (u64)node->cookie);
1857 break;
1858 }
1859 if (cmd == BC_ACQUIRE_DONE) {
1860 if (node->pending_strong_ref == 0) {
1861 binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1862 proc->pid, thread->pid,
1863 node->debug_id);
1864 break;
1865 }
1866 node->pending_strong_ref = 0;
1867 } else {
1868 if (node->pending_weak_ref == 0) {
1869 binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1870 proc->pid, thread->pid,
1871 node->debug_id);
1872 break;
1873 }
1874 node->pending_weak_ref = 0;
1875 }
1876 binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1877 binder_debug(BINDER_DEBUG_USER_REFS,
1878 "%d:%d %s node %d ls %d lw %d\n",
1879 proc->pid, thread->pid,
1880 cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1881 node->debug_id, node->local_strong_refs, node->local_weak_refs);
1882 break;
1883 }
1884 case BC_ATTEMPT_ACQUIRE:
1885 pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1886 return -EINVAL;
1887 case BC_ACQUIRE_RESULT:
1888 pr_err("BC_ACQUIRE_RESULT not supported\n");
1889 return -EINVAL;
1890
1891 case BC_FREE_BUFFER: {
1892 binder_uintptr_t data_ptr;
1893 struct binder_buffer *buffer;
1894
1895 if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
1896 return -EFAULT;
1897 ptr += sizeof(binder_uintptr_t);
1898
1899 buffer = binder_buffer_lookup(proc, data_ptr);
1900 if (buffer == NULL) {
1901 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
1902 proc->pid, thread->pid, (u64)data_ptr);
1903 break;
1904 }
1905 if (!buffer->allow_user_free) {
1906 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
1907 proc->pid, thread->pid, (u64)data_ptr);
1908 break;
1909 }
1910 binder_debug(BINDER_DEBUG_FREE_BUFFER,
1911 "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
1912 proc->pid, thread->pid, (u64)data_ptr,
1913 buffer->debug_id,
1914 buffer->transaction ? "active" : "finished");
1915
1916 if (buffer->transaction) {
1917 buffer->transaction->buffer = NULL;
1918 buffer->transaction = NULL;
1919 }
1920 if (buffer->async_transaction && buffer->target_node) {
1921 BUG_ON(!buffer->target_node->has_async_transaction);
1922 if (list_empty(&buffer->target_node->async_todo))
1923 buffer->target_node->has_async_transaction = 0;
1924 else
1925 list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1926 }
1927 trace_binder_transaction_buffer_release(buffer);
1928 binder_transaction_buffer_release(proc, buffer, NULL);
1929 binder_free_buf(proc, buffer);
1930 break;
1931 }
1932
1933 case BC_TRANSACTION:
1934 case BC_REPLY: {
1935 struct binder_transaction_data tr;
1936
1937 if (copy_from_user(&tr, ptr, sizeof(tr)))
1938 return -EFAULT;
1939 ptr += sizeof(tr);
1940 binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1941 break;
1942 }
1943
1944 case BC_REGISTER_LOOPER:
1945 binder_debug(BINDER_DEBUG_THREADS,
1946 "%d:%d BC_REGISTER_LOOPER\n",
1947 proc->pid, thread->pid);
1948 if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1949 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1950 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1951 proc->pid, thread->pid);
1952 } else if (proc->requested_threads == 0) {
1953 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1954 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1955 proc->pid, thread->pid);
1956 } else {
1957 proc->requested_threads--;
1958 proc->requested_threads_started++;
1959 }
1960 thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1961 break;
1962 case BC_ENTER_LOOPER:
1963 binder_debug(BINDER_DEBUG_THREADS,
1964 "%d:%d BC_ENTER_LOOPER\n",
1965 proc->pid, thread->pid);
1966 if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1967 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1968 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1969 proc->pid, thread->pid);
1970 }
1971 thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1972 break;
1973 case BC_EXIT_LOOPER:
1974 binder_debug(BINDER_DEBUG_THREADS,
1975 "%d:%d BC_EXIT_LOOPER\n",
1976 proc->pid, thread->pid);
1977 thread->looper |= BINDER_LOOPER_STATE_EXITED;
1978 break;
1979
1980 case BC_REQUEST_DEATH_NOTIFICATION:
1981 case BC_CLEAR_DEATH_NOTIFICATION: {
1982 uint32_t target;
1983 binder_uintptr_t cookie;
1984 struct binder_ref *ref;
1985 struct binder_ref_death *death;
1986
1987 if (get_user(target, (uint32_t __user *)ptr))
1988 return -EFAULT;
1989 ptr += sizeof(uint32_t);
1990 if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1991 return -EFAULT;
1992 ptr += sizeof(binder_uintptr_t);
1993 ref = binder_get_ref(proc, target);
1994 if (ref == NULL) {
1995 binder_user_error("%d:%d %s invalid ref %d\n",
1996 proc->pid, thread->pid,
1997 cmd == BC_REQUEST_DEATH_NOTIFICATION ?
1998 "BC_REQUEST_DEATH_NOTIFICATION" :
1999 "BC_CLEAR_DEATH_NOTIFICATION",
2000 target);
2001 break;
2002 }
2003
2004 binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2005 "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
2006 proc->pid, thread->pid,
2007 cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2008 "BC_REQUEST_DEATH_NOTIFICATION" :
2009 "BC_CLEAR_DEATH_NOTIFICATION",
2010 (u64)cookie, ref->debug_id, ref->desc,
2011 ref->strong, ref->weak, ref->node->debug_id);
2012
2013 if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2014 if (ref->death) {
2015 binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2016 proc->pid, thread->pid);
2017 break;
2018 }
2019 death = kzalloc(sizeof(*death), GFP_KERNEL);
2020 if (death == NULL) {
2021 thread->return_error = BR_ERROR;
2022 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2023 "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2024 proc->pid, thread->pid);
2025 break;
2026 }
2027 binder_stats_created(BINDER_STAT_DEATH);
2028 INIT_LIST_HEAD(&death->work.entry);
2029 death->cookie = cookie;
2030 ref->death = death;
2031 if (ref->node->proc == NULL) {
2032 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2033 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2034 list_add_tail(&ref->death->work.entry, &thread->todo);
2035 } else {
2036 list_add_tail(&ref->death->work.entry, &proc->todo);
2037 wake_up_interruptible(&proc->wait);
2038 }
2039 }
2040 } else {
2041 if (ref->death == NULL) {
2042 binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2043 proc->pid, thread->pid);
2044 break;
2045 }
2046 death = ref->death;
2047 if (death->cookie != cookie) {
2048 binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2049 proc->pid, thread->pid,
2050 (u64)death->cookie,
2051 (u64)cookie);
2052 break;
2053 }
2054 ref->death = NULL;
2055 if (list_empty(&death->work.entry)) {
2056 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2057 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2058 list_add_tail(&death->work.entry, &thread->todo);
2059 } else {
2060 list_add_tail(&death->work.entry, &proc->todo);
2061 wake_up_interruptible(&proc->wait);
2062 }
2063 } else {
2064 BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2065 death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2066 }
2067 }
2068 } break;
2069 case BC_DEAD_BINDER_DONE: {
2070 struct binder_work *w;
2071 binder_uintptr_t cookie;
2072 struct binder_ref_death *death = NULL;
2073
2074 if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2075 return -EFAULT;
2076
2077 ptr += sizeof(void *);
2078 list_for_each_entry(w, &proc->delivered_death, entry) {
2079 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2080
2081 if (tmp_death->cookie == cookie) {
2082 death = tmp_death;
2083 break;
2084 }
2085 }
2086 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2087 "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2088 proc->pid, thread->pid, (u64)cookie,
2089 death);
2090 if (death == NULL) {
2091 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2092 proc->pid, thread->pid, (u64)cookie);
2093 break;
2094 }
2095
2096 list_del_init(&death->work.entry);
2097 if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2098 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2099 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2100 list_add_tail(&death->work.entry, &thread->todo);
2101 } else {
2102 list_add_tail(&death->work.entry, &proc->todo);
2103 wake_up_interruptible(&proc->wait);
2104 }
2105 }
2106 } break;
2107
2108 default:
2109 pr_err("%d:%d unknown command %d\n",
2110 proc->pid, thread->pid, cmd);
2111 return -EINVAL;
2112 }
2113 *consumed = ptr - buffer;
2114 }
2115 return 0;
2116 }
2117
2118 static void binder_stat_br(struct binder_proc *proc,
2119 struct binder_thread *thread, uint32_t cmd)
2120 {
2121 trace_binder_return(cmd);
2122 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2123 binder_stats.br[_IOC_NR(cmd)]++;
2124 proc->stats.br[_IOC_NR(cmd)]++;
2125 thread->stats.br[_IOC_NR(cmd)]++;
2126 }
2127 }
2128
2129 static int binder_has_proc_work(struct binder_proc *proc,
2130 struct binder_thread *thread)
2131 {
2132 return !list_empty(&proc->todo) ||
2133 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2134 }
2135
2136 static int binder_has_thread_work(struct binder_thread *thread)
2137 {
2138 return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2139 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2140 }
2141
2142 static int binder_thread_read(struct binder_proc *proc,
2143 struct binder_thread *thread,
2144 binder_uintptr_t binder_buffer, size_t size,
2145 binder_size_t *consumed, int non_block)
2146 {
2147 void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2148 void __user *ptr = buffer + *consumed;
2149 void __user *end = buffer + size;
2150
2151 int ret = 0;
2152 int wait_for_proc_work;
2153
2154 if (*consumed == 0) {
2155 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2156 return -EFAULT;
2157 ptr += sizeof(uint32_t);
2158 }
2159
2160 retry:
2161 wait_for_proc_work = thread->transaction_stack == NULL &&
2162 list_empty(&thread->todo);
2163
2164 if (thread->return_error != BR_OK && ptr < end) {
2165 if (thread->return_error2 != BR_OK) {
2166 if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2167 return -EFAULT;
2168 ptr += sizeof(uint32_t);
2169 binder_stat_br(proc, thread, thread->return_error2);
2170 if (ptr == end)
2171 goto done;
2172 thread->return_error2 = BR_OK;
2173 }
2174 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2175 return -EFAULT;
2176 ptr += sizeof(uint32_t);
2177 binder_stat_br(proc, thread, thread->return_error);
2178 thread->return_error = BR_OK;
2179 goto done;
2180 }
2181
2182
2183 thread->looper |= BINDER_LOOPER_STATE_WAITING;
2184 if (wait_for_proc_work)
2185 proc->ready_threads++;
2186
2187 binder_unlock(__func__);
2188
2189 trace_binder_wait_for_work(wait_for_proc_work,
2190 !!thread->transaction_stack,
2191 !list_empty(&thread->todo));
2192 if (wait_for_proc_work) {
2193 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2194 BINDER_LOOPER_STATE_ENTERED))) {
2195 binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2196 proc->pid, thread->pid, thread->looper);
2197 wait_event_interruptible(binder_user_error_wait,
2198 binder_stop_on_user_error < 2);
2199 }
2200 binder_set_nice(proc->default_priority);
2201 if (non_block) {
2202 if (!binder_has_proc_work(proc, thread))
2203 ret = -EAGAIN;
2204 } else
2205 ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2206 } else {
2207 if (non_block) {
2208 if (!binder_has_thread_work(thread))
2209 ret = -EAGAIN;
2210 } else
2211 ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2212 }
2213
2214 binder_lock(__func__);
2215
2216 if (wait_for_proc_work)
2217 proc->ready_threads--;
2218 thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2219
2220 if (ret)
2221 return ret;
2222
2223 while (1) {
2224 uint32_t cmd;
2225 struct binder_transaction_data tr;
2226 struct binder_work *w;
2227 struct binder_transaction *t = NULL;
2228
2229 if (!list_empty(&thread->todo)) {
2230 w = list_first_entry(&thread->todo, struct binder_work,
2231 entry);
2232 } else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2233 w = list_first_entry(&proc->todo, struct binder_work,
2234 entry);
2235 } else {
2236 /* no data added */
2237 if (ptr - buffer == 4 &&
2238 !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2239 goto retry;
2240 break;
2241 }
2242
2243 if (end - ptr < sizeof(tr) + 4)
2244 break;
2245
2246 switch (w->type) {
2247 case BINDER_WORK_TRANSACTION: {
2248 t = container_of(w, struct binder_transaction, work);
2249 } break;
2250 case BINDER_WORK_TRANSACTION_COMPLETE: {
2251 cmd = BR_TRANSACTION_COMPLETE;
2252 if (put_user(cmd, (uint32_t __user *)ptr))
2253 return -EFAULT;
2254 ptr += sizeof(uint32_t);
2255
2256 binder_stat_br(proc, thread, cmd);
2257 binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2258 "%d:%d BR_TRANSACTION_COMPLETE\n",
2259 proc->pid, thread->pid);
2260
2261 list_del(&w->entry);
2262 kfree(w);
2263 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2264 } break;
2265 case BINDER_WORK_NODE: {
2266 struct binder_node *node = container_of(w, struct binder_node, work);
2267 uint32_t cmd = BR_NOOP;
2268 const char *cmd_name;
2269 int strong = node->internal_strong_refs || node->local_strong_refs;
2270 int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2271
2272 if (weak && !node->has_weak_ref) {
2273 cmd = BR_INCREFS;
2274 cmd_name = "BR_INCREFS";
2275 node->has_weak_ref = 1;
2276 node->pending_weak_ref = 1;
2277 node->local_weak_refs++;
2278 } else if (strong && !node->has_strong_ref) {
2279 cmd = BR_ACQUIRE;
2280 cmd_name = "BR_ACQUIRE";
2281 node->has_strong_ref = 1;
2282 node->pending_strong_ref = 1;
2283 node->local_strong_refs++;
2284 } else if (!strong && node->has_strong_ref) {
2285 cmd = BR_RELEASE;
2286 cmd_name = "BR_RELEASE";
2287 node->has_strong_ref = 0;
2288 } else if (!weak && node->has_weak_ref) {
2289 cmd = BR_DECREFS;
2290 cmd_name = "BR_DECREFS";
2291 node->has_weak_ref = 0;
2292 }
2293 if (cmd != BR_NOOP) {
2294 if (put_user(cmd, (uint32_t __user *)ptr))
2295 return -EFAULT;
2296 ptr += sizeof(uint32_t);
2297 if (put_user(node->ptr,
2298 (binder_uintptr_t __user *)ptr))
2299 return -EFAULT;
2300 ptr += sizeof(binder_uintptr_t);
2301 if (put_user(node->cookie,
2302 (binder_uintptr_t __user *)ptr))
2303 return -EFAULT;
2304 ptr += sizeof(binder_uintptr_t);
2305
2306 binder_stat_br(proc, thread, cmd);
2307 binder_debug(BINDER_DEBUG_USER_REFS,
2308 "%d:%d %s %d u%016llx c%016llx\n",
2309 proc->pid, thread->pid, cmd_name,
2310 node->debug_id,
2311 (u64)node->ptr, (u64)node->cookie);
2312 } else {
2313 list_del_init(&w->entry);
2314 if (!weak && !strong) {
2315 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2316 "%d:%d node %d u%016llx c%016llx deleted\n",
2317 proc->pid, thread->pid,
2318 node->debug_id,
2319 (u64)node->ptr,
2320 (u64)node->cookie);
2321 rb_erase(&node->rb_node, &proc->nodes);
2322 kfree(node);
2323 binder_stats_deleted(BINDER_STAT_NODE);
2324 } else {
2325 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2326 "%d:%d node %d u%016llx c%016llx state unchanged\n",
2327 proc->pid, thread->pid,
2328 node->debug_id,
2329 (u64)node->ptr,
2330 (u64)node->cookie);
2331 }
2332 }
2333 } break;
2334 case BINDER_WORK_DEAD_BINDER:
2335 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2336 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2337 struct binder_ref_death *death;
2338 uint32_t cmd;
2339
2340 death = container_of(w, struct binder_ref_death, work);
2341 if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2342 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2343 else
2344 cmd = BR_DEAD_BINDER;
2345 if (put_user(cmd, (uint32_t __user *)ptr))
2346 return -EFAULT;
2347 ptr += sizeof(uint32_t);
2348 if (put_user(death->cookie,
2349 (binder_uintptr_t __user *)ptr))
2350 return -EFAULT;
2351 ptr += sizeof(binder_uintptr_t);
2352 binder_stat_br(proc, thread, cmd);
2353 binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2354 "%d:%d %s %016llx\n",
2355 proc->pid, thread->pid,
2356 cmd == BR_DEAD_BINDER ?
2357 "BR_DEAD_BINDER" :
2358 "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2359 (u64)death->cookie);
2360
2361 if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2362 list_del(&w->entry);
2363 kfree(death);
2364 binder_stats_deleted(BINDER_STAT_DEATH);
2365 } else
2366 list_move(&w->entry, &proc->delivered_death);
2367 if (cmd == BR_DEAD_BINDER)
2368 goto done; /* DEAD_BINDER notifications can cause transactions */
2369 } break;
2370 }
2371
2372 if (!t)
2373 continue;
2374
2375 BUG_ON(t->buffer == NULL);
2376 if (t->buffer->target_node) {
2377 struct binder_node *target_node = t->buffer->target_node;
2378
2379 tr.target.ptr = target_node->ptr;
2380 tr.cookie = target_node->cookie;
2381 t->saved_priority = task_nice(current);
2382 if (t->priority < target_node->min_priority &&
2383 !(t->flags & TF_ONE_WAY))
2384 binder_set_nice(t->priority);
2385 else if (!(t->flags & TF_ONE_WAY) ||
2386 t->saved_priority > target_node->min_priority)
2387 binder_set_nice(target_node->min_priority);
2388 cmd = BR_TRANSACTION;
2389 } else {
2390 tr.target.ptr = 0;
2391 tr.cookie = 0;
2392 cmd = BR_REPLY;
2393 }
2394 tr.code = t->code;
2395 tr.flags = t->flags;
2396 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2397
2398 if (t->from) {
2399 struct task_struct *sender = t->from->proc->tsk;
2400
2401 tr.sender_pid = task_tgid_nr_ns(sender,
2402 task_active_pid_ns(current));
2403 } else {
2404 tr.sender_pid = 0;
2405 }
2406
2407 tr.data_size = t->buffer->data_size;
2408 tr.offsets_size = t->buffer->offsets_size;
2409 tr.data.ptr.buffer = (binder_uintptr_t)(
2410 (uintptr_t)t->buffer->data +
2411 proc->user_buffer_offset);
2412 tr.data.ptr.offsets = tr.data.ptr.buffer +
2413 ALIGN(t->buffer->data_size,
2414 sizeof(void *));
2415
2416 if (put_user(cmd, (uint32_t __user *)ptr))
2417 return -EFAULT;
2418 ptr += sizeof(uint32_t);
2419 if (copy_to_user(ptr, &tr, sizeof(tr)))
2420 return -EFAULT;
2421 ptr += sizeof(tr);
2422
2423 trace_binder_transaction_received(t);
2424 binder_stat_br(proc, thread, cmd);
2425 binder_debug(BINDER_DEBUG_TRANSACTION,
2426 "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2427 proc->pid, thread->pid,
2428 (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2429 "BR_REPLY",
2430 t->debug_id, t->from ? t->from->proc->pid : 0,
2431 t->from ? t->from->pid : 0, cmd,
2432 t->buffer->data_size, t->buffer->offsets_size,
2433 (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2434
2435 list_del(&t->work.entry);
2436 t->buffer->allow_user_free = 1;
2437 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2438 t->to_parent = thread->transaction_stack;
2439 t->to_thread = thread;
2440 thread->transaction_stack = t;
2441 } else {
2442 t->buffer->transaction = NULL;
2443 kfree(t);
2444 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2445 }
2446 break;
2447 }
2448
2449 done:
2450
2451 *consumed = ptr - buffer;
2452 if (proc->requested_threads + proc->ready_threads == 0 &&
2453 proc->requested_threads_started < proc->max_threads &&
2454 (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2455 BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2456 /*spawn a new thread if we leave this out */) {
2457 proc->requested_threads++;
2458 binder_debug(BINDER_DEBUG_THREADS,
2459 "%d:%d BR_SPAWN_LOOPER\n",
2460 proc->pid, thread->pid);
2461 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2462 return -EFAULT;
2463 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2464 }
2465 return 0;
2466 }
2467
2468 static void binder_release_work(struct list_head *list)
2469 {
2470 struct binder_work *w;
2471
2472 while (!list_empty(list)) {
2473 w = list_first_entry(list, struct binder_work, entry);
2474 list_del_init(&w->entry);
2475 switch (w->type) {
2476 case BINDER_WORK_TRANSACTION: {
2477 struct binder_transaction *t;
2478
2479 t = container_of(w, struct binder_transaction, work);
2480 if (t->buffer->target_node &&
2481 !(t->flags & TF_ONE_WAY)) {
2482 binder_send_failed_reply(t, BR_DEAD_REPLY);
2483 } else {
2484 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2485 "undelivered transaction %d\n",
2486 t->debug_id);
2487 t->buffer->transaction = NULL;
2488 kfree(t);
2489 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2490 }
2491 } break;
2492 case BINDER_WORK_TRANSACTION_COMPLETE: {
2493 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2494 "undelivered TRANSACTION_COMPLETE\n");
2495 kfree(w);
2496 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2497 } break;
2498 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2499 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2500 struct binder_ref_death *death;
2501
2502 death = container_of(w, struct binder_ref_death, work);
2503 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2504 "undelivered death notification, %016llx\n",
2505 (u64)death->cookie);
2506 kfree(death);
2507 binder_stats_deleted(BINDER_STAT_DEATH);
2508 } break;
2509 default:
2510 pr_err("unexpected work type, %d, not freed\n",
2511 w->type);
2512 break;
2513 }
2514 }
2515
2516 }
2517
2518 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2519 {
2520 struct binder_thread *thread = NULL;
2521 struct rb_node *parent = NULL;
2522 struct rb_node **p = &proc->threads.rb_node;
2523
2524 while (*p) {
2525 parent = *p;
2526 thread = rb_entry(parent, struct binder_thread, rb_node);
2527
2528 if (current->pid < thread->pid)
2529 p = &(*p)->rb_left;
2530 else if (current->pid > thread->pid)
2531 p = &(*p)->rb_right;
2532 else
2533 break;
2534 }
2535 if (*p == NULL) {
2536 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2537 if (thread == NULL)
2538 return NULL;
2539 binder_stats_created(BINDER_STAT_THREAD);
2540 thread->proc = proc;
2541 thread->pid = current->pid;
2542 init_waitqueue_head(&thread->wait);
2543 INIT_LIST_HEAD(&thread->todo);
2544 rb_link_node(&thread->rb_node, parent, p);
2545 rb_insert_color(&thread->rb_node, &proc->threads);
2546 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2547 thread->return_error = BR_OK;
2548 thread->return_error2 = BR_OK;
2549 }
2550 return thread;
2551 }
2552
2553 static int binder_free_thread(struct binder_proc *proc,
2554 struct binder_thread *thread)
2555 {
2556 struct binder_transaction *t;
2557 struct binder_transaction *send_reply = NULL;
2558 int active_transactions = 0;
2559
2560 rb_erase(&thread->rb_node, &proc->threads);
2561 t = thread->transaction_stack;
2562 if (t && t->to_thread == thread)
2563 send_reply = t;
2564 while (t) {
2565 active_transactions++;
2566 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2567 "release %d:%d transaction %d %s, still active\n",
2568 proc->pid, thread->pid,
2569 t->debug_id,
2570 (t->to_thread == thread) ? "in" : "out");
2571
2572 if (t->to_thread == thread) {
2573 t->to_proc = NULL;
2574 t->to_thread = NULL;
2575 if (t->buffer) {
2576 t->buffer->transaction = NULL;
2577 t->buffer = NULL;
2578 }
2579 t = t->to_parent;
2580 } else if (t->from == thread) {
2581 t->from = NULL;
2582 t = t->from_parent;
2583 } else
2584 BUG();
2585 }
2586 if (send_reply)
2587 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2588 binder_release_work(&thread->todo);
2589 kfree(thread);
2590 binder_stats_deleted(BINDER_STAT_THREAD);
2591 return active_transactions;
2592 }
2593
2594 static unsigned int binder_poll(struct file *filp,
2595 struct poll_table_struct *wait)
2596 {
2597 struct binder_proc *proc = filp->private_data;
2598 struct binder_thread *thread = NULL;
2599 int wait_for_proc_work;
2600
2601 binder_lock(__func__);
2602
2603 thread = binder_get_thread(proc);
2604
2605 wait_for_proc_work = thread->transaction_stack == NULL &&
2606 list_empty(&thread->todo) && thread->return_error == BR_OK;
2607
2608 binder_unlock(__func__);
2609
2610 if (wait_for_proc_work) {
2611 if (binder_has_proc_work(proc, thread))
2612 return POLLIN;
2613 poll_wait(filp, &proc->wait, wait);
2614 if (binder_has_proc_work(proc, thread))
2615 return POLLIN;
2616 } else {
2617 if (binder_has_thread_work(thread))
2618 return POLLIN;
2619 poll_wait(filp, &thread->wait, wait);
2620 if (binder_has_thread_work(thread))
2621 return POLLIN;
2622 }
2623 return 0;
2624 }
2625
2626 static int binder_ioctl_write_read(struct file *filp,
2627 unsigned int cmd, unsigned long arg,
2628 struct binder_thread *thread)
2629 {
2630 int ret = 0;
2631 struct binder_proc *proc = filp->private_data;
2632 unsigned int size = _IOC_SIZE(cmd);
2633 void __user *ubuf = (void __user *)arg;
2634 struct binder_write_read bwr;
2635
2636 if (size != sizeof(struct binder_write_read)) {
2637 ret = -EINVAL;
2638 goto out;
2639 }
2640 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2641 ret = -EFAULT;
2642 goto out;
2643 }
2644 binder_debug(BINDER_DEBUG_READ_WRITE,
2645 "%d:%d write %lld at %016llx, read %lld at %016llx\n",
2646 proc->pid, thread->pid,
2647 (u64)bwr.write_size, (u64)bwr.write_buffer,
2648 (u64)bwr.read_size, (u64)bwr.read_buffer);
2649
2650 if (bwr.write_size > 0) {
2651 ret = binder_thread_write(proc, thread,
2652 bwr.write_buffer,
2653 bwr.write_size,
2654 &bwr.write_consumed);
2655 trace_binder_write_done(ret);
2656 if (ret < 0) {
2657 bwr.read_consumed = 0;
2658 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2659 ret = -EFAULT;
2660 goto out;
2661 }
2662 }
2663 if (bwr.read_size > 0) {
2664 ret = binder_thread_read(proc, thread, bwr.read_buffer,
2665 bwr.read_size,
2666 &bwr.read_consumed,
2667 filp->f_flags & O_NONBLOCK);
2668 trace_binder_read_done(ret);
2669 if (!list_empty(&proc->todo))
2670 wake_up_interruptible(&proc->wait);
2671 if (ret < 0) {
2672 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2673 ret = -EFAULT;
2674 goto out;
2675 }
2676 }
2677 binder_debug(BINDER_DEBUG_READ_WRITE,
2678 "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
2679 proc->pid, thread->pid,
2680 (u64)bwr.write_consumed, (u64)bwr.write_size,
2681 (u64)bwr.read_consumed, (u64)bwr.read_size);
2682 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2683 ret = -EFAULT;
2684 goto out;
2685 }
2686 out:
2687 return ret;
2688 }
2689
2690 static int binder_ioctl_set_ctx_mgr(struct file *filp)
2691 {
2692 int ret = 0;
2693 struct binder_proc *proc = filp->private_data;
2694 kuid_t curr_euid = current_euid();
2695
2696 if (binder_context_mgr_node != NULL) {
2697 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2698 ret = -EBUSY;
2699 goto out;
2700 }
2701 ret = security_binder_set_context_mgr(proc->tsk);
2702 if (ret < 0)
2703 goto out;
2704 if (uid_valid(binder_context_mgr_uid)) {
2705 if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
2706 pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2707 from_kuid(&init_user_ns, curr_euid),
2708 from_kuid(&init_user_ns,
2709 binder_context_mgr_uid));
2710 ret = -EPERM;
2711 goto out;
2712 }
2713 } else {
2714 binder_context_mgr_uid = curr_euid;
2715 }
2716 binder_context_mgr_node = binder_new_node(proc, 0, 0);
2717 if (binder_context_mgr_node == NULL) {
2718 ret = -ENOMEM;
2719 goto out;
2720 }
2721 binder_context_mgr_node->local_weak_refs++;
2722 binder_context_mgr_node->local_strong_refs++;
2723 binder_context_mgr_node->has_strong_ref = 1;
2724 binder_context_mgr_node->has_weak_ref = 1;
2725 out:
2726 return ret;
2727 }
2728
2729 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2730 {
2731 int ret;
2732 struct binder_proc *proc = filp->private_data;
2733 struct binder_thread *thread;
2734 unsigned int size = _IOC_SIZE(cmd);
2735 void __user *ubuf = (void __user *)arg;
2736
2737 /*pr_info("binder_ioctl: %d:%d %x %lx\n",
2738 proc->pid, current->pid, cmd, arg);*/
2739
2740 trace_binder_ioctl(cmd, arg);
2741
2742 ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2743 if (ret)
2744 goto err_unlocked;
2745
2746 binder_lock(__func__);
2747 thread = binder_get_thread(proc);
2748 if (thread == NULL) {
2749 ret = -ENOMEM;
2750 goto err;
2751 }
2752
2753 switch (cmd) {
2754 case BINDER_WRITE_READ:
2755 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
2756 if (ret)
2757 goto err;
2758 break;
2759 case BINDER_SET_MAX_THREADS:
2760 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2761 ret = -EINVAL;
2762 goto err;
2763 }
2764 break;
2765 case BINDER_SET_CONTEXT_MGR:
2766 ret = binder_ioctl_set_ctx_mgr(filp);
2767 if (ret)
2768 goto err;
2769 break;
2770 case BINDER_THREAD_EXIT:
2771 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2772 proc->pid, thread->pid);
2773 binder_free_thread(proc, thread);
2774 thread = NULL;
2775 break;
2776 case BINDER_VERSION: {
2777 struct binder_version __user *ver = ubuf;
2778
2779 if (size != sizeof(struct binder_version)) {
2780 ret = -EINVAL;
2781 goto err;
2782 }
2783 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
2784 &ver->protocol_version)) {
2785 ret = -EINVAL;
2786 goto err;
2787 }
2788 break;
2789 }
2790 default:
2791 ret = -EINVAL;
2792 goto err;
2793 }
2794 ret = 0;
2795 err:
2796 if (thread)
2797 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2798 binder_unlock(__func__);
2799 wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2800 if (ret && ret != -ERESTARTSYS)
2801 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2802 err_unlocked:
2803 trace_binder_ioctl_done(ret);
2804 return ret;
2805 }
2806
2807 static void binder_vma_open(struct vm_area_struct *vma)
2808 {
2809 struct binder_proc *proc = vma->vm_private_data;
2810
2811 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2812 "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2813 proc->pid, vma->vm_start, vma->vm_end,
2814 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2815 (unsigned long)pgprot_val(vma->vm_page_prot));
2816 }
2817
2818 static void binder_vma_close(struct vm_area_struct *vma)
2819 {
2820 struct binder_proc *proc = vma->vm_private_data;
2821
2822 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2823 "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2824 proc->pid, vma->vm_start, vma->vm_end,
2825 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2826 (unsigned long)pgprot_val(vma->vm_page_prot));
2827 proc->vma = NULL;
2828 proc->vma_vm_mm = NULL;
2829 binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2830 }
2831
2832 static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2833 {
2834 return VM_FAULT_SIGBUS;
2835 }
2836
2837 static struct vm_operations_struct binder_vm_ops = {
2838 .open = binder_vma_open,
2839 .close = binder_vma_close,
2840 .fault = binder_vm_fault,
2841 };
2842
2843 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2844 {
2845 int ret;
2846 struct vm_struct *area;
2847 struct binder_proc *proc = filp->private_data;
2848 const char *failure_string;
2849 struct binder_buffer *buffer;
2850
2851 if (proc->tsk != current)
2852 return -EINVAL;
2853
2854 if ((vma->vm_end - vma->vm_start) > SZ_4M)
2855 vma->vm_end = vma->vm_start + SZ_4M;
2856
2857 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2858 "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2859 proc->pid, vma->vm_start, vma->vm_end,
2860 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2861 (unsigned long)pgprot_val(vma->vm_page_prot));
2862
2863 if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2864 ret = -EPERM;
2865 failure_string = "bad vm_flags";
2866 goto err_bad_arg;
2867 }
2868 vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2869
2870 mutex_lock(&binder_mmap_lock);
2871 if (proc->buffer) {
2872 ret = -EBUSY;
2873 failure_string = "already mapped";
2874 goto err_already_mapped;
2875 }
2876
2877 area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2878 if (area == NULL) {
2879 ret = -ENOMEM;
2880 failure_string = "get_vm_area";
2881 goto err_get_vm_area_failed;
2882 }
2883 proc->buffer = area->addr;
2884 proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2885 mutex_unlock(&binder_mmap_lock);
2886
2887 #ifdef CONFIG_CPU_CACHE_VIPT
2888 if (cache_is_vipt_aliasing()) {
2889 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2890 pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2891 vma->vm_start += PAGE_SIZE;
2892 }
2893 }
2894 #endif
2895 proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2896 if (proc->pages == NULL) {
2897 ret = -ENOMEM;
2898 failure_string = "alloc page array";
2899 goto err_alloc_pages_failed;
2900 }
2901 proc->buffer_size = vma->vm_end - vma->vm_start;
2902
2903 vma->vm_ops = &binder_vm_ops;
2904 vma->vm_private_data = proc;
2905
2906 if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2907 ret = -ENOMEM;
2908 failure_string = "alloc small buf";
2909 goto err_alloc_small_buf_failed;
2910 }
2911 buffer = proc->buffer;
2912 INIT_LIST_HEAD(&proc->buffers);
2913 list_add(&buffer->entry, &proc->buffers);
2914 buffer->free = 1;
2915 binder_insert_free_buffer(proc, buffer);
2916 proc->free_async_space = proc->buffer_size / 2;
2917 barrier();
2918 proc->files = get_files_struct(current);
2919 proc->vma = vma;
2920 proc->vma_vm_mm = vma->vm_mm;
2921
2922 /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2923 proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2924 return 0;
2925
2926 err_alloc_small_buf_failed:
2927 kfree(proc->pages);
2928 proc->pages = NULL;
2929 err_alloc_pages_failed:
2930 mutex_lock(&binder_mmap_lock);
2931 vfree(proc->buffer);
2932 proc->buffer = NULL;
2933 err_get_vm_area_failed:
2934 err_already_mapped:
2935 mutex_unlock(&binder_mmap_lock);
2936 err_bad_arg:
2937 pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2938 proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2939 return ret;
2940 }
2941
2942 static int binder_open(struct inode *nodp, struct file *filp)
2943 {
2944 struct binder_proc *proc;
2945
2946 binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2947 current->group_leader->pid, current->pid);
2948
2949 proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2950 if (proc == NULL)
2951 return -ENOMEM;
2952 get_task_struct(current);
2953 proc->tsk = current;
2954 INIT_LIST_HEAD(&proc->todo);
2955 init_waitqueue_head(&proc->wait);
2956 proc->default_priority = task_nice(current);
2957
2958 binder_lock(__func__);
2959
2960 binder_stats_created(BINDER_STAT_PROC);
2961 hlist_add_head(&proc->proc_node, &binder_procs);
2962 proc->pid = current->group_leader->pid;
2963 INIT_LIST_HEAD(&proc->delivered_death);
2964 filp->private_data = proc;
2965
2966 binder_unlock(__func__);
2967
2968 if (binder_debugfs_dir_entry_proc) {
2969 char strbuf[11];
2970
2971 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
2972 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
2973 binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
2974 }
2975
2976 return 0;
2977 }
2978
2979 static int binder_flush(struct file *filp, fl_owner_t id)
2980 {
2981 struct binder_proc *proc = filp->private_data;
2982
2983 binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
2984
2985 return 0;
2986 }
2987
2988 static void binder_deferred_flush(struct binder_proc *proc)
2989 {
2990 struct rb_node *n;
2991 int wake_count = 0;
2992
2993 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
2994 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
2995
2996 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2997 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
2998 wake_up_interruptible(&thread->wait);
2999 wake_count++;
3000 }
3001 }
3002 wake_up_interruptible_all(&proc->wait);
3003
3004 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3005 "binder_flush: %d woke %d threads\n", proc->pid,
3006 wake_count);
3007 }
3008
3009 static int binder_release(struct inode *nodp, struct file *filp)
3010 {
3011 struct binder_proc *proc = filp->private_data;
3012
3013 debugfs_remove(proc->debugfs_entry);
3014 binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
3015
3016 return 0;
3017 }
3018
3019 static int binder_node_release(struct binder_node *node, int refs)
3020 {
3021 struct binder_ref *ref;
3022 int death = 0;
3023
3024 list_del_init(&node->work.entry);
3025 binder_release_work(&node->async_todo);
3026
3027 if (hlist_empty(&node->refs)) {
3028 kfree(node);
3029 binder_stats_deleted(BINDER_STAT_NODE);
3030
3031 return refs;
3032 }
3033
3034 node->proc = NULL;
3035 node->local_strong_refs = 0;
3036 node->local_weak_refs = 0;
3037 hlist_add_head(&node->dead_node, &binder_dead_nodes);
3038
3039 hlist_for_each_entry(ref, &node->refs, node_entry) {
3040 refs++;
3041
3042 if (!ref->death)
3043 continue;
3044
3045 death++;
3046
3047 if (list_empty(&ref->death->work.entry)) {
3048 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3049 list_add_tail(&ref->death->work.entry,
3050 &ref->proc->todo);
3051 wake_up_interruptible(&ref->proc->wait);
3052 } else
3053 BUG();
3054 }
3055
3056 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3057 "node %d now dead, refs %d, death %d\n",
3058 node->debug_id, refs, death);
3059
3060 return refs;
3061 }
3062
3063 static void binder_deferred_release(struct binder_proc *proc)
3064 {
3065 struct binder_transaction *t;
3066 struct rb_node *n;
3067 int threads, nodes, incoming_refs, outgoing_refs, buffers,
3068 active_transactions, page_count;
3069
3070 BUG_ON(proc->vma);
3071 BUG_ON(proc->files);
3072
3073 hlist_del(&proc->proc_node);
3074
3075 if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
3076 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3077 "%s: %d context_mgr_node gone\n",
3078 __func__, proc->pid);
3079 binder_context_mgr_node = NULL;
3080 }
3081
3082 threads = 0;
3083 active_transactions = 0;
3084 while ((n = rb_first(&proc->threads))) {
3085 struct binder_thread *thread;
3086
3087 thread = rb_entry(n, struct binder_thread, rb_node);
3088 threads++;
3089 active_transactions += binder_free_thread(proc, thread);
3090 }
3091
3092 nodes = 0;
3093 incoming_refs = 0;
3094 while ((n = rb_first(&proc->nodes))) {
3095 struct binder_node *node;
3096
3097 node = rb_entry(n, struct binder_node, rb_node);
3098 nodes++;
3099 rb_erase(&node->rb_node, &proc->nodes);
3100 incoming_refs = binder_node_release(node, incoming_refs);
3101 }
3102
3103 outgoing_refs = 0;
3104 while ((n = rb_first(&proc->refs_by_desc))) {
3105 struct binder_ref *ref;
3106
3107 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3108 outgoing_refs++;
3109 binder_delete_ref(ref);
3110 }
3111
3112 binder_release_work(&proc->todo);
3113 binder_release_work(&proc->delivered_death);
3114
3115 buffers = 0;
3116 while ((n = rb_first(&proc->allocated_buffers))) {
3117 struct binder_buffer *buffer;
3118
3119 buffer = rb_entry(n, struct binder_buffer, rb_node);
3120
3121 t = buffer->transaction;
3122 if (t) {
3123 t->buffer = NULL;
3124 buffer->transaction = NULL;
3125 pr_err("release proc %d, transaction %d, not freed\n",
3126 proc->pid, t->debug_id);
3127 /*BUG();*/
3128 }
3129
3130 binder_free_buf(proc, buffer);
3131 buffers++;
3132 }
3133
3134 binder_stats_deleted(BINDER_STAT_PROC);
3135
3136 page_count = 0;
3137 if (proc->pages) {
3138 int i;
3139
3140 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3141 void *page_addr;
3142
3143 if (!proc->pages[i])
3144 continue;
3145
3146 page_addr = proc->buffer + i * PAGE_SIZE;
3147 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3148 "%s: %d: page %d at %p not freed\n",
3149 __func__, proc->pid, i, page_addr);
3150 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3151 __free_page(proc->pages[i]);
3152 page_count++;
3153 }
3154 kfree(proc->pages);
3155 vfree(proc->buffer);
3156 }
3157
3158 put_task_struct(proc->tsk);
3159
3160 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3161 "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3162 __func__, proc->pid, threads, nodes, incoming_refs,
3163 outgoing_refs, active_transactions, buffers, page_count);
3164
3165 kfree(proc);
3166 }
3167
3168 static void binder_deferred_func(struct work_struct *work)
3169 {
3170 struct binder_proc *proc;
3171 struct files_struct *files;
3172
3173 int defer;
3174
3175 do {
3176 binder_lock(__func__);
3177 mutex_lock(&binder_deferred_lock);
3178 if (!hlist_empty(&binder_deferred_list)) {
3179 proc = hlist_entry(binder_deferred_list.first,
3180 struct binder_proc, deferred_work_node);
3181 hlist_del_init(&proc->deferred_work_node);
3182 defer = proc->deferred_work;
3183 proc->deferred_work = 0;
3184 } else {
3185 proc = NULL;
3186 defer = 0;
3187 }
3188 mutex_unlock(&binder_deferred_lock);
3189
3190 files = NULL;
3191 if (defer & BINDER_DEFERRED_PUT_FILES) {
3192 files = proc->files;
3193 if (files)
3194 proc->files = NULL;
3195 }
3196
3197 if (defer & BINDER_DEFERRED_FLUSH)
3198 binder_deferred_flush(proc);
3199
3200 if (defer & BINDER_DEFERRED_RELEASE)
3201 binder_deferred_release(proc); /* frees proc */
3202
3203 binder_unlock(__func__);
3204 if (files)
3205 put_files_struct(files);
3206 } while (proc);
3207 }
3208 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3209
3210 static void
3211 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3212 {
3213 mutex_lock(&binder_deferred_lock);
3214 proc->deferred_work |= defer;
3215 if (hlist_unhashed(&proc->deferred_work_node)) {
3216 hlist_add_head(&proc->deferred_work_node,
3217 &binder_deferred_list);
3218 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3219 }
3220 mutex_unlock(&binder_deferred_lock);
3221 }
3222
3223 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3224 struct binder_transaction *t)
3225 {
3226 seq_printf(m,
3227 "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3228 prefix, t->debug_id, t,
3229 t->from ? t->from->proc->pid : 0,
3230 t->from ? t->from->pid : 0,
3231 t->to_proc ? t->to_proc->pid : 0,
3232 t->to_thread ? t->to_thread->pid : 0,
3233 t->code, t->flags, t->priority, t->need_reply);
3234 if (t->buffer == NULL) {
3235 seq_puts(m, " buffer free\n");
3236 return;
3237 }
3238 if (t->buffer->target_node)
3239 seq_printf(m, " node %d",
3240 t->buffer->target_node->debug_id);
3241 seq_printf(m, " size %zd:%zd data %p\n",
3242 t->buffer->data_size, t->buffer->offsets_size,
3243 t->buffer->data);
3244 }
3245
3246 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3247 struct binder_buffer *buffer)
3248 {
3249 seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3250 prefix, buffer->debug_id, buffer->data,
3251 buffer->data_size, buffer->offsets_size,
3252 buffer->transaction ? "active" : "delivered");
3253 }
3254
3255 static void print_binder_work(struct seq_file *m, const char *prefix,
3256 const char *transaction_prefix,
3257 struct binder_work *w)
3258 {
3259 struct binder_node *node;
3260 struct binder_transaction *t;
3261
3262 switch (w->type) {
3263 case BINDER_WORK_TRANSACTION:
3264 t = container_of(w, struct binder_transaction, work);
3265 print_binder_transaction(m, transaction_prefix, t);
3266 break;
3267 case BINDER_WORK_TRANSACTION_COMPLETE:
3268 seq_printf(m, "%stransaction complete\n", prefix);
3269 break;
3270 case BINDER_WORK_NODE:
3271 node = container_of(w, struct binder_node, work);
3272 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3273 prefix, node->debug_id,
3274 (u64)node->ptr, (u64)node->cookie);
3275 break;
3276 case BINDER_WORK_DEAD_BINDER:
3277 seq_printf(m, "%shas dead binder\n", prefix);
3278 break;
3279 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3280 seq_printf(m, "%shas cleared dead binder\n", prefix);
3281 break;
3282 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3283 seq_printf(m, "%shas cleared death notification\n", prefix);
3284 break;
3285 default:
3286 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3287 break;
3288 }
3289 }
3290
3291 static void print_binder_thread(struct seq_file *m,
3292 struct binder_thread *thread,
3293 int print_always)
3294 {
3295 struct binder_transaction *t;
3296 struct binder_work *w;
3297 size_t start_pos = m->count;
3298 size_t header_pos;
3299
3300 seq_printf(m, " thread %d: l %02x\n", thread->pid, thread->looper);
3301 header_pos = m->count;
3302 t = thread->transaction_stack;
3303 while (t) {
3304 if (t->from == thread) {
3305 print_binder_transaction(m,
3306 " outgoing transaction", t);
3307 t = t->from_parent;
3308 } else if (t->to_thread == thread) {
3309 print_binder_transaction(m,
3310 " incoming transaction", t);
3311 t = t->to_parent;
3312 } else {
3313 print_binder_transaction(m, " bad transaction", t);
3314 t = NULL;
3315 }
3316 }
3317 list_for_each_entry(w, &thread->todo, entry) {
3318 print_binder_work(m, " ", " pending transaction", w);
3319 }
3320 if (!print_always && m->count == header_pos)
3321 m->count = start_pos;
3322 }
3323
3324 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3325 {
3326 struct binder_ref *ref;
3327 struct binder_work *w;
3328 int count;
3329
3330 count = 0;
3331 hlist_for_each_entry(ref, &node->refs, node_entry)
3332 count++;
3333
3334 seq_printf(m, " node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3335 node->debug_id, (u64)node->ptr, (u64)node->cookie,
3336 node->has_strong_ref, node->has_weak_ref,
3337 node->local_strong_refs, node->local_weak_refs,
3338 node->internal_strong_refs, count);
3339 if (count) {
3340 seq_puts(m, " proc");
3341 hlist_for_each_entry(ref, &node->refs, node_entry)
3342 seq_printf(m, " %d", ref->proc->pid);
3343 }
3344 seq_puts(m, "\n");
3345 list_for_each_entry(w, &node->async_todo, entry)
3346 print_binder_work(m, " ",
3347 " pending async transaction", w);
3348 }
3349
3350 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3351 {
3352 seq_printf(m, " ref %d: desc %d %snode %d s %d w %d d %p\n",
3353 ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3354 ref->node->debug_id, ref->strong, ref->weak, ref->death);
3355 }
3356
3357 static void print_binder_proc(struct seq_file *m,
3358 struct binder_proc *proc, int print_all)
3359 {
3360 struct binder_work *w;
3361 struct rb_node *n;
3362 size_t start_pos = m->count;
3363 size_t header_pos;
3364
3365 seq_printf(m, "proc %d\n", proc->pid);
3366 header_pos = m->count;
3367
3368 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3369 print_binder_thread(m, rb_entry(n, struct binder_thread,
3370 rb_node), print_all);
3371 for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3372 struct binder_node *node = rb_entry(n, struct binder_node,
3373 rb_node);
3374 if (print_all || node->has_async_transaction)
3375 print_binder_node(m, node);
3376 }
3377 if (print_all) {
3378 for (n = rb_first(&proc->refs_by_desc);
3379 n != NULL;
3380 n = rb_next(n))
3381 print_binder_ref(m, rb_entry(n, struct binder_ref,
3382 rb_node_desc));
3383 }
3384 for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3385 print_binder_buffer(m, " buffer",
3386 rb_entry(n, struct binder_buffer, rb_node));
3387 list_for_each_entry(w, &proc->todo, entry)
3388 print_binder_work(m, " ", " pending transaction", w);
3389 list_for_each_entry(w, &proc->delivered_death, entry) {
3390 seq_puts(m, " has delivered dead binder\n");
3391 break;
3392 }
3393 if (!print_all && m->count == header_pos)
3394 m->count = start_pos;
3395 }
3396
3397 static const char * const binder_return_strings[] = {
3398 "BR_ERROR",
3399 "BR_OK",
3400 "BR_TRANSACTION",
3401 "BR_REPLY",
3402 "BR_ACQUIRE_RESULT",
3403 "BR_DEAD_REPLY",
3404 "BR_TRANSACTION_COMPLETE",
3405 "BR_INCREFS",
3406 "BR_ACQUIRE",
3407 "BR_RELEASE",
3408 "BR_DECREFS",
3409 "BR_ATTEMPT_ACQUIRE",
3410 "BR_NOOP",
3411 "BR_SPAWN_LOOPER",
3412 "BR_FINISHED",
3413 "BR_DEAD_BINDER",
3414 "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3415 "BR_FAILED_REPLY"
3416 };
3417
3418 static const char * const binder_command_strings[] = {
3419 "BC_TRANSACTION",
3420 "BC_REPLY",
3421 "BC_ACQUIRE_RESULT",
3422 "BC_FREE_BUFFER",
3423 "BC_INCREFS",
3424 "BC_ACQUIRE",
3425 "BC_RELEASE",
3426 "BC_DECREFS",
3427 "BC_INCREFS_DONE",
3428 "BC_ACQUIRE_DONE",
3429 "BC_ATTEMPT_ACQUIRE",
3430 "BC_REGISTER_LOOPER",
3431 "BC_ENTER_LOOPER",
3432 "BC_EXIT_LOOPER",
3433 "BC_REQUEST_DEATH_NOTIFICATION",
3434 "BC_CLEAR_DEATH_NOTIFICATION",
3435 "BC_DEAD_BINDER_DONE"
3436 };
3437
3438 static const char * const binder_objstat_strings[] = {
3439 "proc",
3440 "thread",
3441 "node",
3442 "ref",
3443 "death",
3444 "transaction",
3445 "transaction_complete"
3446 };
3447
3448 static void print_binder_stats(struct seq_file *m, const char *prefix,
3449 struct binder_stats *stats)
3450 {
3451 int i;
3452
3453 BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3454 ARRAY_SIZE(binder_command_strings));
3455 for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3456 if (stats->bc[i])
3457 seq_printf(m, "%s%s: %d\n", prefix,
3458 binder_command_strings[i], stats->bc[i]);
3459 }
3460
3461 BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3462 ARRAY_SIZE(binder_return_strings));
3463 for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3464 if (stats->br[i])
3465 seq_printf(m, "%s%s: %d\n", prefix,
3466 binder_return_strings[i], stats->br[i]);
3467 }
3468
3469 BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3470 ARRAY_SIZE(binder_objstat_strings));
3471 BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3472 ARRAY_SIZE(stats->obj_deleted));
3473 for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3474 if (stats->obj_created[i] || stats->obj_deleted[i])
3475 seq_printf(m, "%s%s: active %d total %d\n", prefix,
3476 binder_objstat_strings[i],
3477 stats->obj_created[i] - stats->obj_deleted[i],
3478 stats->obj_created[i]);
3479 }
3480 }
3481
3482 static void print_binder_proc_stats(struct seq_file *m,
3483 struct binder_proc *proc)
3484 {
3485 struct binder_work *w;
3486 struct rb_node *n;
3487 int count, strong, weak;
3488
3489 seq_printf(m, "proc %d\n", proc->pid);
3490 count = 0;
3491 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3492 count++;
3493 seq_printf(m, " threads: %d\n", count);
3494 seq_printf(m, " requested threads: %d+%d/%d\n"
3495 " ready threads %d\n"
3496 " free async space %zd\n", proc->requested_threads,
3497 proc->requested_threads_started, proc->max_threads,
3498 proc->ready_threads, proc->free_async_space);
3499 count = 0;
3500 for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3501 count++;
3502 seq_printf(m, " nodes: %d\n", count);
3503 count = 0;
3504 strong = 0;
3505 weak = 0;
3506 for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3507 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3508 rb_node_desc);
3509 count++;
3510 strong += ref->strong;
3511 weak += ref->weak;
3512 }
3513 seq_printf(m, " refs: %d s %d w %d\n", count, strong, weak);
3514
3515 count = 0;
3516 for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3517 count++;
3518 seq_printf(m, " buffers: %d\n", count);
3519
3520 count = 0;
3521 list_for_each_entry(w, &proc->todo, entry) {
3522 switch (w->type) {
3523 case BINDER_WORK_TRANSACTION:
3524 count++;
3525 break;
3526 default:
3527 break;
3528 }
3529 }
3530 seq_printf(m, " pending transactions: %d\n", count);
3531
3532 print_binder_stats(m, " ", &proc->stats);
3533 }
3534
3535
3536 static int binder_state_show(struct seq_file *m, void *unused)
3537 {
3538 struct binder_proc *proc;
3539 struct binder_node *node;
3540 int do_lock = !binder_debug_no_lock;
3541
3542 if (do_lock)
3543 binder_lock(__func__);
3544
3545 seq_puts(m, "binder state:\n");
3546
3547 if (!hlist_empty(&binder_dead_nodes))
3548 seq_puts(m, "dead nodes:\n");
3549 hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3550 print_binder_node(m, node);
3551
3552 hlist_for_each_entry(proc, &binder_procs, proc_node)
3553 print_binder_proc(m, proc, 1);
3554 if (do_lock)
3555 binder_unlock(__func__);
3556 return 0;
3557 }
3558
3559 static int binder_stats_show(struct seq_file *m, void *unused)
3560 {
3561 struct binder_proc *proc;
3562 int do_lock = !binder_debug_no_lock;
3563
3564 if (do_lock)
3565 binder_lock(__func__);
3566
3567 seq_puts(m, "binder stats:\n");
3568
3569 print_binder_stats(m, "", &binder_stats);
3570
3571 hlist_for_each_entry(proc, &binder_procs, proc_node)
3572 print_binder_proc_stats(m, proc);
3573 if (do_lock)
3574 binder_unlock(__func__);
3575 return 0;
3576 }
3577
3578 static int binder_transactions_show(struct seq_file *m, void *unused)
3579 {
3580 struct binder_proc *proc;
3581 int do_lock = !binder_debug_no_lock;
3582
3583 if (do_lock)
3584 binder_lock(__func__);
3585
3586 seq_puts(m, "binder transactions:\n");
3587 hlist_for_each_entry(proc, &binder_procs, proc_node)
3588 print_binder_proc(m, proc, 0);
3589 if (do_lock)
3590 binder_unlock(__func__);
3591 return 0;
3592 }
3593
3594 static int binder_proc_show(struct seq_file *m, void *unused)
3595 {
3596 struct binder_proc *proc = m->private;
3597 int do_lock = !binder_debug_no_lock;
3598
3599 if (do_lock)
3600 binder_lock(__func__);
3601 seq_puts(m, "binder proc state:\n");
3602 print_binder_proc(m, proc, 1);
3603 if (do_lock)
3604 binder_unlock(__func__);
3605 return 0;
3606 }
3607
3608 static void print_binder_transaction_log_entry(struct seq_file *m,
3609 struct binder_transaction_log_entry *e)
3610 {
3611 seq_printf(m,
3612 "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3613 e->debug_id, (e->call_type == 2) ? "reply" :
3614 ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3615 e->from_thread, e->to_proc, e->to_thread, e->to_node,
3616 e->target_handle, e->data_size, e->offsets_size);
3617 }
3618
3619 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3620 {
3621 struct binder_transaction_log *log = m->private;
3622 int i;
3623
3624 if (log->full) {
3625 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3626 print_binder_transaction_log_entry(m, &log->entry[i]);
3627 }
3628 for (i = 0; i < log->next; i++)
3629 print_binder_transaction_log_entry(m, &log->entry[i]);
3630 return 0;
3631 }
3632
3633 static const struct file_operations binder_fops = {
3634 .owner = THIS_MODULE,
3635 .poll = binder_poll,
3636 .unlocked_ioctl = binder_ioctl,
3637 .compat_ioctl = binder_ioctl,
3638 .mmap = binder_mmap,
3639 .open = binder_open,
3640 .flush = binder_flush,
3641 .release = binder_release,
3642 };
3643
3644 static struct miscdevice binder_miscdev = {
3645 .minor = MISC_DYNAMIC_MINOR,
3646 .name = "binder",
3647 .fops = &binder_fops
3648 };
3649
3650 BINDER_DEBUG_ENTRY(state);
3651 BINDER_DEBUG_ENTRY(stats);
3652 BINDER_DEBUG_ENTRY(transactions);
3653 BINDER_DEBUG_ENTRY(transaction_log);
3654
3655 static int __init binder_init(void)
3656 {
3657 int ret;
3658
3659 binder_deferred_workqueue = create_singlethread_workqueue("binder");
3660 if (!binder_deferred_workqueue)
3661 return -ENOMEM;
3662
3663 binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3664 if (binder_debugfs_dir_entry_root)
3665 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3666 binder_debugfs_dir_entry_root);
3667 ret = misc_register(&binder_miscdev);
3668 if (binder_debugfs_dir_entry_root) {
3669 debugfs_create_file("state",
3670 S_IRUGO,
3671 binder_debugfs_dir_entry_root,
3672 NULL,
3673 &binder_state_fops);
3674 debugfs_create_file("stats",
3675 S_IRUGO,
3676 binder_debugfs_dir_entry_root,
3677 NULL,
3678 &binder_stats_fops);
3679 debugfs_create_file("transactions",
3680 S_IRUGO,
3681 binder_debugfs_dir_entry_root,
3682 NULL,
3683 &binder_transactions_fops);
3684 debugfs_create_file("transaction_log",
3685 S_IRUGO,
3686 binder_debugfs_dir_entry_root,
3687 &binder_transaction_log,
3688 &binder_transaction_log_fops);
3689 debugfs_create_file("failed_transaction_log",
3690 S_IRUGO,
3691 binder_debugfs_dir_entry_root,
3692 &binder_transaction_log_failed,
3693 &binder_transaction_log_fops);
3694 }
3695 return ret;
3696 }
3697
3698 device_initcall(binder_init);
3699
3700 #define CREATE_TRACE_POINTS
3701 #include "binder_trace.h"
3702
3703 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
This page took 0.15943 seconds and 5 git commands to generate.