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powerpc/mm/4k: don't allocate larger pmd page table for 4k
[linux/fpc-iii.git] / drivers / android / binder.c
blob3c71b982bf2a35ae1a406e35fac2683577edb2b8
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
63 #define BINDER_DEBUG_ENTRY(name) \
64 static int binder_##name##_open(struct inode *inode, struct file *file) \
65 { \
66 return single_open(file, binder_##name##_show, inode->i_private); \
67 } \
68 \
69 static const struct file_operations binder_##name##_fops = { \
70 .owner = THIS_MODULE, \
71 .open = binder_##name##_open, \
72 .read = seq_read, \
73 .llseek = seq_lseek, \
74 .release = single_release, \
75 }
76
77 static int binder_proc_show(struct seq_file *m, void *unused);
78 BINDER_DEBUG_ENTRY(proc);
79
80 /* This is only defined in include/asm-arm/sizes.h */
81 #ifndef SZ_1K
82 #define SZ_1K 0x400
83 #endif
84
85 #ifndef SZ_4M
86 #define SZ_4M 0x400000
87 #endif
88
89 #define FORBIDDEN_MMAP_FLAGS (VM_WRITE)
90
91 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
92
93 enum {
94 BINDER_DEBUG_USER_ERROR = 1U << 0,
95 BINDER_DEBUG_FAILED_TRANSACTION = 1U << 1,
96 BINDER_DEBUG_DEAD_TRANSACTION = 1U << 2,
97 BINDER_DEBUG_OPEN_CLOSE = 1U << 3,
98 BINDER_DEBUG_DEAD_BINDER = 1U << 4,
99 BINDER_DEBUG_DEATH_NOTIFICATION = 1U << 5,
100 BINDER_DEBUG_READ_WRITE = 1U << 6,
101 BINDER_DEBUG_USER_REFS = 1U << 7,
102 BINDER_DEBUG_THREADS = 1U << 8,
103 BINDER_DEBUG_TRANSACTION = 1U << 9,
104 BINDER_DEBUG_TRANSACTION_COMPLETE = 1U << 10,
105 BINDER_DEBUG_FREE_BUFFER = 1U << 11,
106 BINDER_DEBUG_INTERNAL_REFS = 1U << 12,
107 BINDER_DEBUG_BUFFER_ALLOC = 1U << 13,
108 BINDER_DEBUG_PRIORITY_CAP = 1U << 14,
109 BINDER_DEBUG_BUFFER_ALLOC_ASYNC = 1U << 15,
110 };
111 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
112 BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
113 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
114
115 static bool binder_debug_no_lock;
116 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
117
118 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
119 static int binder_stop_on_user_error;
120
121 static int binder_set_stop_on_user_error(const char *val,
122 struct kernel_param *kp)
123 {
124 int ret;
125
126 ret = param_set_int(val, kp);
127 if (binder_stop_on_user_error < 2)
128 wake_up(&binder_user_error_wait);
129 return ret;
130 }
131 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
132 param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
133
134 #define binder_debug(mask, x...) \
135 do { \
136 if (binder_debug_mask & mask) \
137 pr_info(x); \
138 } while (0)
139
140 #define binder_user_error(x...) \
141 do { \
142 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
143 pr_info(x); \
144 if (binder_stop_on_user_error) \
145 binder_stop_on_user_error = 2; \
146 } while (0)
147
148 enum binder_stat_types {
149 BINDER_STAT_PROC,
150 BINDER_STAT_THREAD,
151 BINDER_STAT_NODE,
152 BINDER_STAT_REF,
153 BINDER_STAT_DEATH,
154 BINDER_STAT_TRANSACTION,
155 BINDER_STAT_TRANSACTION_COMPLETE,
156 BINDER_STAT_COUNT
157 };
158
159 struct binder_stats {
160 int br[_IOC_NR(BR_FAILED_REPLY) + 1];
161 int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
162 int obj_created[BINDER_STAT_COUNT];
163 int obj_deleted[BINDER_STAT_COUNT];
164 };
165
166 static struct binder_stats binder_stats;
167
168 static inline void binder_stats_deleted(enum binder_stat_types type)
169 {
170 binder_stats.obj_deleted[type]++;
171 }
172
173 static inline void binder_stats_created(enum binder_stat_types type)
174 {
175 binder_stats.obj_created[type]++;
176 }
177
178 struct binder_transaction_log_entry {
179 int debug_id;
180 int call_type;
181 int from_proc;
182 int from_thread;
183 int target_handle;
184 int to_proc;
185 int to_thread;
186 int to_node;
187 int data_size;
188 int offsets_size;
189 };
190 struct binder_transaction_log {
191 int next;
192 int full;
193 struct binder_transaction_log_entry entry[32];
194 };
195 static struct binder_transaction_log binder_transaction_log;
196 static struct binder_transaction_log binder_transaction_log_failed;
197
198 static struct binder_transaction_log_entry *binder_transaction_log_add(
199 struct binder_transaction_log *log)
200 {
201 struct binder_transaction_log_entry *e;
202
203 e = &log->entry[log->next];
204 memset(e, 0, sizeof(*e));
205 log->next++;
206 if (log->next == ARRAY_SIZE(log->entry)) {
207 log->next = 0;
208 log->full = 1;
209 }
210 return e;
211 }
212
213 struct binder_work {
214 struct list_head entry;
215 enum {
216 BINDER_WORK_TRANSACTION = 1,
217 BINDER_WORK_TRANSACTION_COMPLETE,
218 BINDER_WORK_NODE,
219 BINDER_WORK_DEAD_BINDER,
220 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
221 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
222 } type;
223 };
224
225 struct binder_node {
226 int debug_id;
227 struct binder_work work;
228 union {
229 struct rb_node rb_node;
230 struct hlist_node dead_node;
231 };
232 struct binder_proc *proc;
233 struct hlist_head refs;
234 int internal_strong_refs;
235 int local_weak_refs;
236 int local_strong_refs;
237 binder_uintptr_t ptr;
238 binder_uintptr_t cookie;
239 unsigned has_strong_ref:1;
240 unsigned pending_strong_ref:1;
241 unsigned has_weak_ref:1;
242 unsigned pending_weak_ref:1;
243 unsigned has_async_transaction:1;
244 unsigned accept_fds:1;
245 unsigned min_priority:8;
246 struct list_head async_todo;
247 };
248
249 struct binder_ref_death {
250 struct binder_work work;
251 binder_uintptr_t cookie;
252 };
253
254 struct binder_ref {
255 /* Lookups needed: */
256 /* node + proc => ref (transaction) */
257 /* desc + proc => ref (transaction, inc/dec ref) */
258 /* node => refs + procs (proc exit) */
259 int debug_id;
260 struct rb_node rb_node_desc;
261 struct rb_node rb_node_node;
262 struct hlist_node node_entry;
263 struct binder_proc *proc;
264 struct binder_node *node;
265 uint32_t desc;
266 int strong;
267 int weak;
268 struct binder_ref_death *death;
269 };
270
271 struct binder_buffer {
272 struct list_head entry; /* free and allocated entries by address */
273 struct rb_node rb_node; /* free entry by size or allocated entry */
274 /* by address */
275 unsigned free:1;
276 unsigned allow_user_free:1;
277 unsigned async_transaction:1;
278 unsigned debug_id:29;
279
280 struct binder_transaction *transaction;
281
282 struct binder_node *target_node;
283 size_t data_size;
284 size_t offsets_size;
285 uint8_t data[0];
286 };
287
288 enum binder_deferred_state {
289 BINDER_DEFERRED_PUT_FILES = 0x01,
290 BINDER_DEFERRED_FLUSH = 0x02,
291 BINDER_DEFERRED_RELEASE = 0x04,
292 };
293
294 struct binder_proc {
295 struct hlist_node proc_node;
296 struct rb_root threads;
297 struct rb_root nodes;
298 struct rb_root refs_by_desc;
299 struct rb_root refs_by_node;
300 int pid;
301 struct vm_area_struct *vma;
302 struct mm_struct *vma_vm_mm;
303 struct task_struct *tsk;
304 struct files_struct *files;
305 struct hlist_node deferred_work_node;
306 int deferred_work;
307 void *buffer;
308 ptrdiff_t user_buffer_offset;
309
310 struct list_head buffers;
311 struct rb_root free_buffers;
312 struct rb_root allocated_buffers;
313 size_t free_async_space;
314
315 struct page **pages;
316 size_t buffer_size;
317 uint32_t buffer_free;
318 struct list_head todo;
319 wait_queue_head_t wait;
320 struct binder_stats stats;
321 struct list_head delivered_death;
322 int max_threads;
323 int requested_threads;
324 int requested_threads_started;
325 int ready_threads;
326 long default_priority;
327 struct dentry *debugfs_entry;
328 };
329
330 enum {
331 BINDER_LOOPER_STATE_REGISTERED = 0x01,
332 BINDER_LOOPER_STATE_ENTERED = 0x02,
333 BINDER_LOOPER_STATE_EXITED = 0x04,
334 BINDER_LOOPER_STATE_INVALID = 0x08,
335 BINDER_LOOPER_STATE_WAITING = 0x10,
336 BINDER_LOOPER_STATE_NEED_RETURN = 0x20
337 };
338
339 struct binder_thread {
340 struct binder_proc *proc;
341 struct rb_node rb_node;
342 int pid;
343 int looper;
344 struct binder_transaction *transaction_stack;
345 struct list_head todo;
346 uint32_t return_error; /* Write failed, return error code in read buf */
347 uint32_t return_error2; /* Write failed, return error code in read */
348 /* buffer. Used when sending a reply to a dead process that */
349 /* we are also waiting on */
350 wait_queue_head_t wait;
351 struct binder_stats stats;
352 };
353
354 struct binder_transaction {
355 int debug_id;
356 struct binder_work work;
357 struct binder_thread *from;
358 struct binder_transaction *from_parent;
359 struct binder_proc *to_proc;
360 struct binder_thread *to_thread;
361 struct binder_transaction *to_parent;
362 unsigned need_reply:1;
363 /* unsigned is_dead:1; */ /* not used at the moment */
364
365 struct binder_buffer *buffer;
366 unsigned int code;
367 unsigned int flags;
368 long priority;
369 long saved_priority;
370 kuid_t sender_euid;
371 };
372
373 static void
374 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
375
376 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
377 {
378 struct files_struct *files = proc->files;
379 unsigned long rlim_cur;
380 unsigned long irqs;
381
382 if (files == NULL)
383 return -ESRCH;
384
385 if (!lock_task_sighand(proc->tsk, &irqs))
386 return -EMFILE;
387
388 rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
389 unlock_task_sighand(proc->tsk, &irqs);
390
391 return __alloc_fd(files, 0, rlim_cur, flags);
392 }
393
394 /*
395 * copied from fd_install
396 */
397 static void task_fd_install(
398 struct binder_proc *proc, unsigned int fd, struct file *file)
399 {
400 if (proc->files)
401 __fd_install(proc->files, fd, file);
402 }
403
404 /*
405 * copied from sys_close
406 */
407 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
408 {
409 int retval;
410
411 if (proc->files == NULL)
412 return -ESRCH;
413
414 retval = __close_fd(proc->files, fd);
415 /* can't restart close syscall because file table entry was cleared */
416 if (unlikely(retval == -ERESTARTSYS ||
417 retval == -ERESTARTNOINTR ||
418 retval == -ERESTARTNOHAND ||
419 retval == -ERESTART_RESTARTBLOCK))
420 retval = -EINTR;
421
422 return retval;
423 }
424
425 static inline void binder_lock(const char *tag)
426 {
427 trace_binder_lock(tag);
428 mutex_lock(&binder_main_lock);
429 trace_binder_locked(tag);
430 }
431
432 static inline void binder_unlock(const char *tag)
433 {
434 trace_binder_unlock(tag);
435 mutex_unlock(&binder_main_lock);
436 }
437
438 static void binder_set_nice(long nice)
439 {
440 long min_nice;
441
442 if (can_nice(current, nice)) {
443 set_user_nice(current, nice);
444 return;
445 }
446 min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
447 binder_debug(BINDER_DEBUG_PRIORITY_CAP,
448 "%d: nice value %ld not allowed use %ld instead\n",
449 current->pid, nice, min_nice);
450 set_user_nice(current, min_nice);
451 if (min_nice <= MAX_NICE)
452 return;
453 binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
454 }
455
456 static size_t binder_buffer_size(struct binder_proc *proc,
457 struct binder_buffer *buffer)
458 {
459 if (list_is_last(&buffer->entry, &proc->buffers))
460 return proc->buffer + proc->buffer_size - (void *)buffer->data;
461 return (size_t)list_entry(buffer->entry.next,
462 struct binder_buffer, entry) - (size_t)buffer->data;
463 }
464
465 static void binder_insert_free_buffer(struct binder_proc *proc,
466 struct binder_buffer *new_buffer)
467 {
468 struct rb_node **p = &proc->free_buffers.rb_node;
469 struct rb_node *parent = NULL;
470 struct binder_buffer *buffer;
471 size_t buffer_size;
472 size_t new_buffer_size;
473
474 BUG_ON(!new_buffer->free);
475
476 new_buffer_size = binder_buffer_size(proc, new_buffer);
477
478 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
479 "%d: add free buffer, size %zd, at %p\n",
480 proc->pid, new_buffer_size, new_buffer);
481
482 while (*p) {
483 parent = *p;
484 buffer = rb_entry(parent, struct binder_buffer, rb_node);
485 BUG_ON(!buffer->free);
486
487 buffer_size = binder_buffer_size(proc, buffer);
488
489 if (new_buffer_size < buffer_size)
490 p = &parent->rb_left;
491 else
492 p = &parent->rb_right;
493 }
494 rb_link_node(&new_buffer->rb_node, parent, p);
495 rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
496 }
497
498 static void binder_insert_allocated_buffer(struct binder_proc *proc,
499 struct binder_buffer *new_buffer)
500 {
501 struct rb_node **p = &proc->allocated_buffers.rb_node;
502 struct rb_node *parent = NULL;
503 struct binder_buffer *buffer;
504
505 BUG_ON(new_buffer->free);
506
507 while (*p) {
508 parent = *p;
509 buffer = rb_entry(parent, struct binder_buffer, rb_node);
510 BUG_ON(buffer->free);
511
512 if (new_buffer < buffer)
513 p = &parent->rb_left;
514 else if (new_buffer > buffer)
515 p = &parent->rb_right;
516 else
517 BUG();
518 }
519 rb_link_node(&new_buffer->rb_node, parent, p);
520 rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
521 }
522
523 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
524 uintptr_t user_ptr)
525 {
526 struct rb_node *n = proc->allocated_buffers.rb_node;
527 struct binder_buffer *buffer;
528 struct binder_buffer *kern_ptr;
529
530 kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
531 - offsetof(struct binder_buffer, data));
532
533 while (n) {
534 buffer = rb_entry(n, struct binder_buffer, rb_node);
535 BUG_ON(buffer->free);
536
537 if (kern_ptr < buffer)
538 n = n->rb_left;
539 else if (kern_ptr > buffer)
540 n = n->rb_right;
541 else
542 return buffer;
543 }
544 return NULL;
545 }
546
547 static int binder_update_page_range(struct binder_proc *proc, int allocate,
548 void *start, void *end,
549 struct vm_area_struct *vma)
550 {
551 void *page_addr;
552 unsigned long user_page_addr;
553 struct page **page;
554 struct mm_struct *mm;
555
556 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
557 "%d: %s pages %p-%p\n", proc->pid,
558 allocate ? "allocate" : "free", start, end);
559
560 if (end <= start)
561 return 0;
562
563 trace_binder_update_page_range(proc, allocate, start, end);
564
565 if (vma)
566 mm = NULL;
567 else
568 mm = get_task_mm(proc->tsk);
569
570 if (mm) {
571 down_write(&mm->mmap_sem);
572 vma = proc->vma;
573 if (vma && mm != proc->vma_vm_mm) {
574 pr_err("%d: vma mm and task mm mismatch\n",
575 proc->pid);
576 vma = NULL;
577 }
578 }
579
580 if (allocate == 0)
581 goto free_range;
582
583 if (vma == NULL) {
584 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
585 proc->pid);
586 goto err_no_vma;
587 }
588
589 for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
590 int ret;
591
592 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
593
594 BUG_ON(*page);
595 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
596 if (*page == NULL) {
597 pr_err("%d: binder_alloc_buf failed for page at %p\n",
598 proc->pid, page_addr);
599 goto err_alloc_page_failed;
600 }
601 ret = map_kernel_range_noflush((unsigned long)page_addr,
602 PAGE_SIZE, PAGE_KERNEL, page);
603 flush_cache_vmap((unsigned long)page_addr,
604 (unsigned long)page_addr + PAGE_SIZE);
605 if (ret != 1) {
606 pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
607 proc->pid, page_addr);
608 goto err_map_kernel_failed;
609 }
610 user_page_addr =
611 (uintptr_t)page_addr + proc->user_buffer_offset;
612 ret = vm_insert_page(vma, user_page_addr, page[0]);
613 if (ret) {
614 pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
615 proc->pid, user_page_addr);
616 goto err_vm_insert_page_failed;
617 }
618 /* vm_insert_page does not seem to increment the refcount */
619 }
620 if (mm) {
621 up_write(&mm->mmap_sem);
622 mmput(mm);
623 }
624 return 0;
625
626 free_range:
627 for (page_addr = end - PAGE_SIZE; page_addr >= start;
628 page_addr -= PAGE_SIZE) {
629 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
630 if (vma)
631 zap_page_range(vma, (uintptr_t)page_addr +
632 proc->user_buffer_offset, PAGE_SIZE, NULL);
633 err_vm_insert_page_failed:
634 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
635 err_map_kernel_failed:
636 __free_page(*page);
637 *page = NULL;
638 err_alloc_page_failed:
639 ;
640 }
641 err_no_vma:
642 if (mm) {
643 up_write(&mm->mmap_sem);
644 mmput(mm);
645 }
646 return -ENOMEM;
647 }
648
649 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
650 size_t data_size,
651 size_t offsets_size, int is_async)
652 {
653 struct rb_node *n = proc->free_buffers.rb_node;
654 struct binder_buffer *buffer;
655 size_t buffer_size;
656 struct rb_node *best_fit = NULL;
657 void *has_page_addr;
658 void *end_page_addr;
659 size_t size;
660
661 if (proc->vma == NULL) {
662 pr_err("%d: binder_alloc_buf, no vma\n",
663 proc->pid);
664 return NULL;
665 }
666
667 size = ALIGN(data_size, sizeof(void *)) +
668 ALIGN(offsets_size, sizeof(void *));
669
670 if (size < data_size || size < offsets_size) {
671 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
672 proc->pid, data_size, offsets_size);
673 return NULL;
674 }
675
676 if (is_async &&
677 proc->free_async_space < size + sizeof(struct binder_buffer)) {
678 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
679 "%d: binder_alloc_buf size %zd failed, no async space left\n",
680 proc->pid, size);
681 return NULL;
682 }
683
684 while (n) {
685 buffer = rb_entry(n, struct binder_buffer, rb_node);
686 BUG_ON(!buffer->free);
687 buffer_size = binder_buffer_size(proc, buffer);
688
689 if (size < buffer_size) {
690 best_fit = n;
691 n = n->rb_left;
692 } else if (size > buffer_size)
693 n = n->rb_right;
694 else {
695 best_fit = n;
696 break;
697 }
698 }
699 if (best_fit == NULL) {
700 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
701 proc->pid, size);
702 return NULL;
703 }
704 if (n == NULL) {
705 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
706 buffer_size = binder_buffer_size(proc, buffer);
707 }
708
709 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
710 "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
711 proc->pid, size, buffer, buffer_size);
712
713 has_page_addr =
714 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
715 if (n == NULL) {
716 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
717 buffer_size = size; /* no room for other buffers */
718 else
719 buffer_size = size + sizeof(struct binder_buffer);
720 }
721 end_page_addr =
722 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
723 if (end_page_addr > has_page_addr)
724 end_page_addr = has_page_addr;
725 if (binder_update_page_range(proc, 1,
726 (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
727 return NULL;
728
729 rb_erase(best_fit, &proc->free_buffers);
730 buffer->free = 0;
731 binder_insert_allocated_buffer(proc, buffer);
732 if (buffer_size != size) {
733 struct binder_buffer *new_buffer = (void *)buffer->data + size;
734
735 list_add(&new_buffer->entry, &buffer->entry);
736 new_buffer->free = 1;
737 binder_insert_free_buffer(proc, new_buffer);
738 }
739 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
740 "%d: binder_alloc_buf size %zd got %p\n",
741 proc->pid, size, buffer);
742 buffer->data_size = data_size;
743 buffer->offsets_size = offsets_size;
744 buffer->async_transaction = is_async;
745 if (is_async) {
746 proc->free_async_space -= size + sizeof(struct binder_buffer);
747 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
748 "%d: binder_alloc_buf size %zd async free %zd\n",
749 proc->pid, size, proc->free_async_space);
750 }
751
752 return buffer;
753 }
754
755 static void *buffer_start_page(struct binder_buffer *buffer)
756 {
757 return (void *)((uintptr_t)buffer & PAGE_MASK);
758 }
759
760 static void *buffer_end_page(struct binder_buffer *buffer)
761 {
762 return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
763 }
764
765 static void binder_delete_free_buffer(struct binder_proc *proc,
766 struct binder_buffer *buffer)
767 {
768 struct binder_buffer *prev, *next = NULL;
769 int free_page_end = 1;
770 int free_page_start = 1;
771
772 BUG_ON(proc->buffers.next == &buffer->entry);
773 prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
774 BUG_ON(!prev->free);
775 if (buffer_end_page(prev) == buffer_start_page(buffer)) {
776 free_page_start = 0;
777 if (buffer_end_page(prev) == buffer_end_page(buffer))
778 free_page_end = 0;
779 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
780 "%d: merge free, buffer %p share page with %p\n",
781 proc->pid, buffer, prev);
782 }
783
784 if (!list_is_last(&buffer->entry, &proc->buffers)) {
785 next = list_entry(buffer->entry.next,
786 struct binder_buffer, entry);
787 if (buffer_start_page(next) == buffer_end_page(buffer)) {
788 free_page_end = 0;
789 if (buffer_start_page(next) ==
790 buffer_start_page(buffer))
791 free_page_start = 0;
792 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
793 "%d: merge free, buffer %p share page with %p\n",
794 proc->pid, buffer, prev);
795 }
796 }
797 list_del(&buffer->entry);
798 if (free_page_start || free_page_end) {
799 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
800 "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
801 proc->pid, buffer, free_page_start ? "" : " end",
802 free_page_end ? "" : " start", prev, next);
803 binder_update_page_range(proc, 0, free_page_start ?
804 buffer_start_page(buffer) : buffer_end_page(buffer),
805 (free_page_end ? buffer_end_page(buffer) :
806 buffer_start_page(buffer)) + PAGE_SIZE, NULL);
807 }
808 }
809
810 static void binder_free_buf(struct binder_proc *proc,
811 struct binder_buffer *buffer)
812 {
813 size_t size, buffer_size;
814
815 buffer_size = binder_buffer_size(proc, buffer);
816
817 size = ALIGN(buffer->data_size, sizeof(void *)) +
818 ALIGN(buffer->offsets_size, sizeof(void *));
819
820 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
821 "%d: binder_free_buf %p size %zd buffer_size %zd\n",
822 proc->pid, buffer, size, buffer_size);
823
824 BUG_ON(buffer->free);
825 BUG_ON(size > buffer_size);
826 BUG_ON(buffer->transaction != NULL);
827 BUG_ON((void *)buffer < proc->buffer);
828 BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
829
830 if (buffer->async_transaction) {
831 proc->free_async_space += size + sizeof(struct binder_buffer);
832
833 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
834 "%d: binder_free_buf size %zd async free %zd\n",
835 proc->pid, size, proc->free_async_space);
836 }
837
838 binder_update_page_range(proc, 0,
839 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
840 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
841 NULL);
842 rb_erase(&buffer->rb_node, &proc->allocated_buffers);
843 buffer->free = 1;
844 if (!list_is_last(&buffer->entry, &proc->buffers)) {
845 struct binder_buffer *next = list_entry(buffer->entry.next,
846 struct binder_buffer, entry);
847
848 if (next->free) {
849 rb_erase(&next->rb_node, &proc->free_buffers);
850 binder_delete_free_buffer(proc, next);
851 }
852 }
853 if (proc->buffers.next != &buffer->entry) {
854 struct binder_buffer *prev = list_entry(buffer->entry.prev,
855 struct binder_buffer, entry);
856
857 if (prev->free) {
858 binder_delete_free_buffer(proc, buffer);
859 rb_erase(&prev->rb_node, &proc->free_buffers);
860 buffer = prev;
861 }
862 }
863 binder_insert_free_buffer(proc, buffer);
864 }
865
866 static struct binder_node *binder_get_node(struct binder_proc *proc,
867 binder_uintptr_t ptr)
868 {
869 struct rb_node *n = proc->nodes.rb_node;
870 struct binder_node *node;
871
872 while (n) {
873 node = rb_entry(n, struct binder_node, rb_node);
874
875 if (ptr < node->ptr)
876 n = n->rb_left;
877 else if (ptr > node->ptr)
878 n = n->rb_right;
879 else
880 return node;
881 }
882 return NULL;
883 }
884
885 static struct binder_node *binder_new_node(struct binder_proc *proc,
886 binder_uintptr_t ptr,
887 binder_uintptr_t cookie)
888 {
889 struct rb_node **p = &proc->nodes.rb_node;
890 struct rb_node *parent = NULL;
891 struct binder_node *node;
892
893 while (*p) {
894 parent = *p;
895 node = rb_entry(parent, struct binder_node, rb_node);
896
897 if (ptr < node->ptr)
898 p = &(*p)->rb_left;
899 else if (ptr > node->ptr)
900 p = &(*p)->rb_right;
901 else
902 return NULL;
903 }
904
905 node = kzalloc(sizeof(*node), GFP_KERNEL);
906 if (node == NULL)
907 return NULL;
908 binder_stats_created(BINDER_STAT_NODE);
909 rb_link_node(&node->rb_node, parent, p);
910 rb_insert_color(&node->rb_node, &proc->nodes);
911 node->debug_id = ++binder_last_id;
912 node->proc = proc;
913 node->ptr = ptr;
914 node->cookie = cookie;
915 node->work.type = BINDER_WORK_NODE;
916 INIT_LIST_HEAD(&node->work.entry);
917 INIT_LIST_HEAD(&node->async_todo);
918 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
919 "%d:%d node %d u%016llx c%016llx created\n",
920 proc->pid, current->pid, node->debug_id,
921 (u64)node->ptr, (u64)node->cookie);
922 return node;
923 }
924
925 static int binder_inc_node(struct binder_node *node, int strong, int internal,
926 struct list_head *target_list)
927 {
928 if (strong) {
929 if (internal) {
930 if (target_list == NULL &&
931 node->internal_strong_refs == 0 &&
932 !(node == binder_context_mgr_node &&
933 node->has_strong_ref)) {
934 pr_err("invalid inc strong node for %d\n",
935 node->debug_id);
936 return -EINVAL;
937 }
938 node->internal_strong_refs++;
939 } else
940 node->local_strong_refs++;
941 if (!node->has_strong_ref && target_list) {
942 list_del_init(&node->work.entry);
943 list_add_tail(&node->work.entry, target_list);
944 }
945 } else {
946 if (!internal)
947 node->local_weak_refs++;
948 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
949 if (target_list == NULL) {
950 pr_err("invalid inc weak node for %d\n",
951 node->debug_id);
952 return -EINVAL;
953 }
954 list_add_tail(&node->work.entry, target_list);
955 }
956 }
957 return 0;
958 }
959
960 static int binder_dec_node(struct binder_node *node, int strong, int internal)
961 {
962 if (strong) {
963 if (internal)
964 node->internal_strong_refs--;
965 else
966 node->local_strong_refs--;
967 if (node->local_strong_refs || node->internal_strong_refs)
968 return 0;
969 } else {
970 if (!internal)
971 node->local_weak_refs--;
972 if (node->local_weak_refs || !hlist_empty(&node->refs))
973 return 0;
974 }
975 if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
976 if (list_empty(&node->work.entry)) {
977 list_add_tail(&node->work.entry, &node->proc->todo);
978 wake_up_interruptible(&node->proc->wait);
979 }
980 } else {
981 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
982 !node->local_weak_refs) {
983 list_del_init(&node->work.entry);
984 if (node->proc) {
985 rb_erase(&node->rb_node, &node->proc->nodes);
986 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
987 "refless node %d deleted\n",
988 node->debug_id);
989 } else {
990 hlist_del(&node->dead_node);
991 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
992 "dead node %d deleted\n",
993 node->debug_id);
994 }
995 kfree(node);
996 binder_stats_deleted(BINDER_STAT_NODE);
997 }
998 }
999
1000 return 0;
1001 }
1002
1003
1004 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1005 u32 desc, bool need_strong_ref)
1006 {
1007 struct rb_node *n = proc->refs_by_desc.rb_node;
1008 struct binder_ref *ref;
1009
1010 while (n) {
1011 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1012
1013 if (desc < ref->desc) {
1014 n = n->rb_left;
1015 } else if (desc > ref->desc) {
1016 n = n->rb_right;
1017 } else if (need_strong_ref && !ref->strong) {
1018 binder_user_error("tried to use weak ref as strong ref\n");
1019 return NULL;
1020 } else {
1021 return ref;
1022 }
1023 }
1024 return NULL;
1025 }
1026
1027 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1028 struct binder_node *node)
1029 {
1030 struct rb_node *n;
1031 struct rb_node **p = &proc->refs_by_node.rb_node;
1032 struct rb_node *parent = NULL;
1033 struct binder_ref *ref, *new_ref;
1034
1035 while (*p) {
1036 parent = *p;
1037 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1038
1039 if (node < ref->node)
1040 p = &(*p)->rb_left;
1041 else if (node > ref->node)
1042 p = &(*p)->rb_right;
1043 else
1044 return ref;
1045 }
1046 new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1047 if (new_ref == NULL)
1048 return NULL;
1049 binder_stats_created(BINDER_STAT_REF);
1050 new_ref->debug_id = ++binder_last_id;
1051 new_ref->proc = proc;
1052 new_ref->node = node;
1053 rb_link_node(&new_ref->rb_node_node, parent, p);
1054 rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1055
1056 new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
1057 for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1058 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1059 if (ref->desc > new_ref->desc)
1060 break;
1061 new_ref->desc = ref->desc + 1;
1062 }
1063
1064 p = &proc->refs_by_desc.rb_node;
1065 while (*p) {
1066 parent = *p;
1067 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1068
1069 if (new_ref->desc < ref->desc)
1070 p = &(*p)->rb_left;
1071 else if (new_ref->desc > ref->desc)
1072 p = &(*p)->rb_right;
1073 else
1074 BUG();
1075 }
1076 rb_link_node(&new_ref->rb_node_desc, parent, p);
1077 rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1078 if (node) {
1079 hlist_add_head(&new_ref->node_entry, &node->refs);
1080
1081 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1082 "%d new ref %d desc %d for node %d\n",
1083 proc->pid, new_ref->debug_id, new_ref->desc,
1084 node->debug_id);
1085 } else {
1086 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1087 "%d new ref %d desc %d for dead node\n",
1088 proc->pid, new_ref->debug_id, new_ref->desc);
1089 }
1090 return new_ref;
1091 }
1092
1093 static void binder_delete_ref(struct binder_ref *ref)
1094 {
1095 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1096 "%d delete ref %d desc %d for node %d\n",
1097 ref->proc->pid, ref->debug_id, ref->desc,
1098 ref->node->debug_id);
1099
1100 rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1101 rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1102 if (ref->strong)
1103 binder_dec_node(ref->node, 1, 1);
1104 hlist_del(&ref->node_entry);
1105 binder_dec_node(ref->node, 0, 1);
1106 if (ref->death) {
1107 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1108 "%d delete ref %d desc %d has death notification\n",
1109 ref->proc->pid, ref->debug_id, ref->desc);
1110 list_del(&ref->death->work.entry);
1111 kfree(ref->death);
1112 binder_stats_deleted(BINDER_STAT_DEATH);
1113 }
1114 kfree(ref);
1115 binder_stats_deleted(BINDER_STAT_REF);
1116 }
1117
1118 static int binder_inc_ref(struct binder_ref *ref, int strong,
1119 struct list_head *target_list)
1120 {
1121 int ret;
1122
1123 if (strong) {
1124 if (ref->strong == 0) {
1125 ret = binder_inc_node(ref->node, 1, 1, target_list);
1126 if (ret)
1127 return ret;
1128 }
1129 ref->strong++;
1130 } else {
1131 if (ref->weak == 0) {
1132 ret = binder_inc_node(ref->node, 0, 1, target_list);
1133 if (ret)
1134 return ret;
1135 }
1136 ref->weak++;
1137 }
1138 return 0;
1139 }
1140
1141
1142 static int binder_dec_ref(struct binder_ref *ref, int strong)
1143 {
1144 if (strong) {
1145 if (ref->strong == 0) {
1146 binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1147 ref->proc->pid, ref->debug_id,
1148 ref->desc, ref->strong, ref->weak);
1149 return -EINVAL;
1150 }
1151 ref->strong--;
1152 if (ref->strong == 0) {
1153 int ret;
1154
1155 ret = binder_dec_node(ref->node, strong, 1);
1156 if (ret)
1157 return ret;
1158 }
1159 } else {
1160 if (ref->weak == 0) {
1161 binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1162 ref->proc->pid, ref->debug_id,
1163 ref->desc, ref->strong, ref->weak);
1164 return -EINVAL;
1165 }
1166 ref->weak--;
1167 }
1168 if (ref->strong == 0 && ref->weak == 0)
1169 binder_delete_ref(ref);
1170 return 0;
1171 }
1172
1173 static void binder_pop_transaction(struct binder_thread *target_thread,
1174 struct binder_transaction *t)
1175 {
1176 if (target_thread) {
1177 BUG_ON(target_thread->transaction_stack != t);
1178 BUG_ON(target_thread->transaction_stack->from != target_thread);
1179 target_thread->transaction_stack =
1180 target_thread->transaction_stack->from_parent;
1181 t->from = NULL;
1182 }
1183 t->need_reply = 0;
1184 if (t->buffer)
1185 t->buffer->transaction = NULL;
1186 kfree(t);
1187 binder_stats_deleted(BINDER_STAT_TRANSACTION);
1188 }
1189
1190 static void binder_send_failed_reply(struct binder_transaction *t,
1191 uint32_t error_code)
1192 {
1193 struct binder_thread *target_thread;
1194 struct binder_transaction *next;
1195
1196 BUG_ON(t->flags & TF_ONE_WAY);
1197 while (1) {
1198 target_thread = t->from;
1199 if (target_thread) {
1200 if (target_thread->return_error != BR_OK &&
1201 target_thread->return_error2 == BR_OK) {
1202 target_thread->return_error2 =
1203 target_thread->return_error;
1204 target_thread->return_error = BR_OK;
1205 }
1206 if (target_thread->return_error == BR_OK) {
1207 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1208 "send failed reply for transaction %d to %d:%d\n",
1209 t->debug_id,
1210 target_thread->proc->pid,
1211 target_thread->pid);
1212
1213 binder_pop_transaction(target_thread, t);
1214 target_thread->return_error = error_code;
1215 wake_up_interruptible(&target_thread->wait);
1216 } else {
1217 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1218 target_thread->proc->pid,
1219 target_thread->pid,
1220 target_thread->return_error);
1221 }
1222 return;
1223 }
1224 next = t->from_parent;
1225
1226 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1227 "send failed reply for transaction %d, target dead\n",
1228 t->debug_id);
1229
1230 binder_pop_transaction(target_thread, t);
1231 if (next == NULL) {
1232 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1233 "reply failed, no target thread at root\n");
1234 return;
1235 }
1236 t = next;
1237 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1238 "reply failed, no target thread -- retry %d\n",
1239 t->debug_id);
1240 }
1241 }
1242
1243 static void binder_transaction_buffer_release(struct binder_proc *proc,
1244 struct binder_buffer *buffer,
1245 binder_size_t *failed_at)
1246 {
1247 binder_size_t *offp, *off_end;
1248 int debug_id = buffer->debug_id;
1249
1250 binder_debug(BINDER_DEBUG_TRANSACTION,
1251 "%d buffer release %d, size %zd-%zd, failed at %p\n",
1252 proc->pid, buffer->debug_id,
1253 buffer->data_size, buffer->offsets_size, failed_at);
1254
1255 if (buffer->target_node)
1256 binder_dec_node(buffer->target_node, 1, 0);
1257
1258 offp = (binder_size_t *)(buffer->data +
1259 ALIGN(buffer->data_size, sizeof(void *)));
1260 if (failed_at)
1261 off_end = failed_at;
1262 else
1263 off_end = (void *)offp + buffer->offsets_size;
1264 for (; offp < off_end; offp++) {
1265 struct flat_binder_object *fp;
1266
1267 if (*offp > buffer->data_size - sizeof(*fp) ||
1268 buffer->data_size < sizeof(*fp) ||
1269 !IS_ALIGNED(*offp, sizeof(u32))) {
1270 pr_err("transaction release %d bad offset %lld, size %zd\n",
1271 debug_id, (u64)*offp, buffer->data_size);
1272 continue;
1273 }
1274 fp = (struct flat_binder_object *)(buffer->data + *offp);
1275 switch (fp->type) {
1276 case BINDER_TYPE_BINDER:
1277 case BINDER_TYPE_WEAK_BINDER: {
1278 struct binder_node *node = binder_get_node(proc, fp->binder);
1279
1280 if (node == NULL) {
1281 pr_err("transaction release %d bad node %016llx\n",
1282 debug_id, (u64)fp->binder);
1283 break;
1284 }
1285 binder_debug(BINDER_DEBUG_TRANSACTION,
1286 " node %d u%016llx\n",
1287 node->debug_id, (u64)node->ptr);
1288 binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
1289 } break;
1290 case BINDER_TYPE_HANDLE:
1291 case BINDER_TYPE_WEAK_HANDLE: {
1292 struct binder_ref *ref;
1293
1294 ref = binder_get_ref(proc, fp->handle,
1295 fp->type == BINDER_TYPE_HANDLE);
1296
1297 if (ref == NULL) {
1298 pr_err("transaction release %d bad handle %d\n",
1299 debug_id, fp->handle);
1300 break;
1301 }
1302 binder_debug(BINDER_DEBUG_TRANSACTION,
1303 " ref %d desc %d (node %d)\n",
1304 ref->debug_id, ref->desc, ref->node->debug_id);
1305 binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
1306 } break;
1307
1308 case BINDER_TYPE_FD:
1309 binder_debug(BINDER_DEBUG_TRANSACTION,
1310 " fd %d\n", fp->handle);
1311 if (failed_at)
1312 task_close_fd(proc, fp->handle);
1313 break;
1314
1315 default:
1316 pr_err("transaction release %d bad object type %x\n",
1317 debug_id, fp->type);
1318 break;
1319 }
1320 }
1321 }
1322
1323 static void binder_transaction(struct binder_proc *proc,
1324 struct binder_thread *thread,
1325 struct binder_transaction_data *tr, int reply)
1326 {
1327 struct binder_transaction *t;
1328 struct binder_work *tcomplete;
1329 binder_size_t *offp, *off_end;
1330 binder_size_t off_min;
1331 struct binder_proc *target_proc;
1332 struct binder_thread *target_thread = NULL;
1333 struct binder_node *target_node = NULL;
1334 struct list_head *target_list;
1335 wait_queue_head_t *target_wait;
1336 struct binder_transaction *in_reply_to = NULL;
1337 struct binder_transaction_log_entry *e;
1338 uint32_t return_error;
1339
1340 e = binder_transaction_log_add(&binder_transaction_log);
1341 e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1342 e->from_proc = proc->pid;
1343 e->from_thread = thread->pid;
1344 e->target_handle = tr->target.handle;
1345 e->data_size = tr->data_size;
1346 e->offsets_size = tr->offsets_size;
1347
1348 if (reply) {
1349 in_reply_to = thread->transaction_stack;
1350 if (in_reply_to == NULL) {
1351 binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1352 proc->pid, thread->pid);
1353 return_error = BR_FAILED_REPLY;
1354 goto err_empty_call_stack;
1355 }
1356 binder_set_nice(in_reply_to->saved_priority);
1357 if (in_reply_to->to_thread != thread) {
1358 binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1359 proc->pid, thread->pid, in_reply_to->debug_id,
1360 in_reply_to->to_proc ?
1361 in_reply_to->to_proc->pid : 0,
1362 in_reply_to->to_thread ?
1363 in_reply_to->to_thread->pid : 0);
1364 return_error = BR_FAILED_REPLY;
1365 in_reply_to = NULL;
1366 goto err_bad_call_stack;
1367 }
1368 thread->transaction_stack = in_reply_to->to_parent;
1369 target_thread = in_reply_to->from;
1370 if (target_thread == NULL) {
1371 return_error = BR_DEAD_REPLY;
1372 goto err_dead_binder;
1373 }
1374 if (target_thread->transaction_stack != in_reply_to) {
1375 binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1376 proc->pid, thread->pid,
1377 target_thread->transaction_stack ?
1378 target_thread->transaction_stack->debug_id : 0,
1379 in_reply_to->debug_id);
1380 return_error = BR_FAILED_REPLY;
1381 in_reply_to = NULL;
1382 target_thread = NULL;
1383 goto err_dead_binder;
1384 }
1385 target_proc = target_thread->proc;
1386 } else {
1387 if (tr->target.handle) {
1388 struct binder_ref *ref;
1389
1390 ref = binder_get_ref(proc, tr->target.handle, true);
1391 if (ref == NULL) {
1392 binder_user_error("%d:%d got transaction to invalid handle\n",
1393 proc->pid, thread->pid);
1394 return_error = BR_FAILED_REPLY;
1395 goto err_invalid_target_handle;
1396 }
1397 target_node = ref->node;
1398 } else {
1399 target_node = binder_context_mgr_node;
1400 if (target_node == NULL) {
1401 return_error = BR_DEAD_REPLY;
1402 goto err_no_context_mgr_node;
1403 }
1404 }
1405 e->to_node = target_node->debug_id;
1406 target_proc = target_node->proc;
1407 if (target_proc == NULL) {
1408 return_error = BR_DEAD_REPLY;
1409 goto err_dead_binder;
1410 }
1411 if (security_binder_transaction(proc->tsk,
1412 target_proc->tsk) < 0) {
1413 return_error = BR_FAILED_REPLY;
1414 goto err_invalid_target_handle;
1415 }
1416 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1417 struct binder_transaction *tmp;
1418
1419 tmp = thread->transaction_stack;
1420 if (tmp->to_thread != thread) {
1421 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1422 proc->pid, thread->pid, tmp->debug_id,
1423 tmp->to_proc ? tmp->to_proc->pid : 0,
1424 tmp->to_thread ?
1425 tmp->to_thread->pid : 0);
1426 return_error = BR_FAILED_REPLY;
1427 goto err_bad_call_stack;
1428 }
1429 while (tmp) {
1430 if (tmp->from && tmp->from->proc == target_proc)
1431 target_thread = tmp->from;
1432 tmp = tmp->from_parent;
1433 }
1434 }
1435 }
1436 if (target_thread) {
1437 e->to_thread = target_thread->pid;
1438 target_list = &target_thread->todo;
1439 target_wait = &target_thread->wait;
1440 } else {
1441 target_list = &target_proc->todo;
1442 target_wait = &target_proc->wait;
1443 }
1444 e->to_proc = target_proc->pid;
1445
1446 /* TODO: reuse incoming transaction for reply */
1447 t = kzalloc(sizeof(*t), GFP_KERNEL);
1448 if (t == NULL) {
1449 return_error = BR_FAILED_REPLY;
1450 goto err_alloc_t_failed;
1451 }
1452 binder_stats_created(BINDER_STAT_TRANSACTION);
1453
1454 tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1455 if (tcomplete == NULL) {
1456 return_error = BR_FAILED_REPLY;
1457 goto err_alloc_tcomplete_failed;
1458 }
1459 binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1460
1461 t->debug_id = ++binder_last_id;
1462 e->debug_id = t->debug_id;
1463
1464 if (reply)
1465 binder_debug(BINDER_DEBUG_TRANSACTION,
1466 "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld\n",
1467 proc->pid, thread->pid, t->debug_id,
1468 target_proc->pid, target_thread->pid,
1469 (u64)tr->data.ptr.buffer,
1470 (u64)tr->data.ptr.offsets,
1471 (u64)tr->data_size, (u64)tr->offsets_size);
1472 else
1473 binder_debug(BINDER_DEBUG_TRANSACTION,
1474 "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld\n",
1475 proc->pid, thread->pid, t->debug_id,
1476 target_proc->pid, target_node->debug_id,
1477 (u64)tr->data.ptr.buffer,
1478 (u64)tr->data.ptr.offsets,
1479 (u64)tr->data_size, (u64)tr->offsets_size);
1480
1481 if (!reply && !(tr->flags & TF_ONE_WAY))
1482 t->from = thread;
1483 else
1484 t->from = NULL;
1485 t->sender_euid = task_euid(proc->tsk);
1486 t->to_proc = target_proc;
1487 t->to_thread = target_thread;
1488 t->code = tr->code;
1489 t->flags = tr->flags;
1490 t->priority = task_nice(current);
1491
1492 trace_binder_transaction(reply, t, target_node);
1493
1494 t->buffer = binder_alloc_buf(target_proc, tr->data_size,
1495 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
1496 if (t->buffer == NULL) {
1497 return_error = BR_FAILED_REPLY;
1498 goto err_binder_alloc_buf_failed;
1499 }
1500 t->buffer->allow_user_free = 0;
1501 t->buffer->debug_id = t->debug_id;
1502 t->buffer->transaction = t;
1503 t->buffer->target_node = target_node;
1504 trace_binder_transaction_alloc_buf(t->buffer);
1505 if (target_node)
1506 binder_inc_node(target_node, 1, 0, NULL);
1507
1508 offp = (binder_size_t *)(t->buffer->data +
1509 ALIGN(tr->data_size, sizeof(void *)));
1510
1511 if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
1512 tr->data.ptr.buffer, tr->data_size)) {
1513 binder_user_error("%d:%d got transaction with invalid data ptr\n",
1514 proc->pid, thread->pid);
1515 return_error = BR_FAILED_REPLY;
1516 goto err_copy_data_failed;
1517 }
1518 if (copy_from_user(offp, (const void __user *)(uintptr_t)
1519 tr->data.ptr.offsets, tr->offsets_size)) {
1520 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
1521 proc->pid, thread->pid);
1522 return_error = BR_FAILED_REPLY;
1523 goto err_copy_data_failed;
1524 }
1525 if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
1526 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
1527 proc->pid, thread->pid, (u64)tr->offsets_size);
1528 return_error = BR_FAILED_REPLY;
1529 goto err_bad_offset;
1530 }
1531 off_end = (void *)offp + tr->offsets_size;
1532 off_min = 0;
1533 for (; offp < off_end; offp++) {
1534 struct flat_binder_object *fp;
1535
1536 if (*offp > t->buffer->data_size - sizeof(*fp) ||
1537 *offp < off_min ||
1538 t->buffer->data_size < sizeof(*fp) ||
1539 !IS_ALIGNED(*offp, sizeof(u32))) {
1540 binder_user_error("%d:%d got transaction with invalid offset, %lld (min %lld, max %lld)\n",
1541 proc->pid, thread->pid, (u64)*offp,
1542 (u64)off_min,
1543 (u64)(t->buffer->data_size -
1544 sizeof(*fp)));
1545 return_error = BR_FAILED_REPLY;
1546 goto err_bad_offset;
1547 }
1548 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
1549 off_min = *offp + sizeof(struct flat_binder_object);
1550 switch (fp->type) {
1551 case BINDER_TYPE_BINDER:
1552 case BINDER_TYPE_WEAK_BINDER: {
1553 struct binder_ref *ref;
1554 struct binder_node *node = binder_get_node(proc, fp->binder);
1555
1556 if (node == NULL) {
1557 node = binder_new_node(proc, fp->binder, fp->cookie);
1558 if (node == NULL) {
1559 return_error = BR_FAILED_REPLY;
1560 goto err_binder_new_node_failed;
1561 }
1562 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1563 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1564 }
1565 if (fp->cookie != node->cookie) {
1566 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1567 proc->pid, thread->pid,
1568 (u64)fp->binder, node->debug_id,
1569 (u64)fp->cookie, (u64)node->cookie);
1570 return_error = BR_FAILED_REPLY;
1571 goto err_binder_get_ref_for_node_failed;
1572 }
1573 if (security_binder_transfer_binder(proc->tsk,
1574 target_proc->tsk)) {
1575 return_error = BR_FAILED_REPLY;
1576 goto err_binder_get_ref_for_node_failed;
1577 }
1578 ref = binder_get_ref_for_node(target_proc, node);
1579 if (ref == NULL) {
1580 return_error = BR_FAILED_REPLY;
1581 goto err_binder_get_ref_for_node_failed;
1582 }
1583 if (fp->type == BINDER_TYPE_BINDER)
1584 fp->type = BINDER_TYPE_HANDLE;
1585 else
1586 fp->type = BINDER_TYPE_WEAK_HANDLE;
1587 fp->binder = 0;
1588 fp->handle = ref->desc;
1589 fp->cookie = 0;
1590 binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
1591 &thread->todo);
1592
1593 trace_binder_transaction_node_to_ref(t, node, ref);
1594 binder_debug(BINDER_DEBUG_TRANSACTION,
1595 " node %d u%016llx -> ref %d desc %d\n",
1596 node->debug_id, (u64)node->ptr,
1597 ref->debug_id, ref->desc);
1598 } break;
1599 case BINDER_TYPE_HANDLE:
1600 case BINDER_TYPE_WEAK_HANDLE: {
1601 struct binder_ref *ref;
1602
1603 ref = binder_get_ref(proc, fp->handle,
1604 fp->type == BINDER_TYPE_HANDLE);
1605
1606 if (ref == NULL) {
1607 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1608 proc->pid,
1609 thread->pid, fp->handle);
1610 return_error = BR_FAILED_REPLY;
1611 goto err_binder_get_ref_failed;
1612 }
1613 if (security_binder_transfer_binder(proc->tsk,
1614 target_proc->tsk)) {
1615 return_error = BR_FAILED_REPLY;
1616 goto err_binder_get_ref_failed;
1617 }
1618 if (ref->node->proc == target_proc) {
1619 if (fp->type == BINDER_TYPE_HANDLE)
1620 fp->type = BINDER_TYPE_BINDER;
1621 else
1622 fp->type = BINDER_TYPE_WEAK_BINDER;
1623 fp->binder = ref->node->ptr;
1624 fp->cookie = ref->node->cookie;
1625 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
1626 trace_binder_transaction_ref_to_node(t, ref);
1627 binder_debug(BINDER_DEBUG_TRANSACTION,
1628 " ref %d desc %d -> node %d u%016llx\n",
1629 ref->debug_id, ref->desc, ref->node->debug_id,
1630 (u64)ref->node->ptr);
1631 } else {
1632 struct binder_ref *new_ref;
1633
1634 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1635 if (new_ref == NULL) {
1636 return_error = BR_FAILED_REPLY;
1637 goto err_binder_get_ref_for_node_failed;
1638 }
1639 fp->binder = 0;
1640 fp->handle = new_ref->desc;
1641 fp->cookie = 0;
1642 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
1643 trace_binder_transaction_ref_to_ref(t, ref,
1644 new_ref);
1645 binder_debug(BINDER_DEBUG_TRANSACTION,
1646 " ref %d desc %d -> ref %d desc %d (node %d)\n",
1647 ref->debug_id, ref->desc, new_ref->debug_id,
1648 new_ref->desc, ref->node->debug_id);
1649 }
1650 } break;
1651
1652 case BINDER_TYPE_FD: {
1653 int target_fd;
1654 struct file *file;
1655
1656 if (reply) {
1657 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
1658 binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
1659 proc->pid, thread->pid, fp->handle);
1660 return_error = BR_FAILED_REPLY;
1661 goto err_fd_not_allowed;
1662 }
1663 } else if (!target_node->accept_fds) {
1664 binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
1665 proc->pid, thread->pid, fp->handle);
1666 return_error = BR_FAILED_REPLY;
1667 goto err_fd_not_allowed;
1668 }
1669
1670 file = fget(fp->handle);
1671 if (file == NULL) {
1672 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1673 proc->pid, thread->pid, fp->handle);
1674 return_error = BR_FAILED_REPLY;
1675 goto err_fget_failed;
1676 }
1677 if (security_binder_transfer_file(proc->tsk,
1678 target_proc->tsk,
1679 file) < 0) {
1680 fput(file);
1681 return_error = BR_FAILED_REPLY;
1682 goto err_get_unused_fd_failed;
1683 }
1684 target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1685 if (target_fd < 0) {
1686 fput(file);
1687 return_error = BR_FAILED_REPLY;
1688 goto err_get_unused_fd_failed;
1689 }
1690 task_fd_install(target_proc, target_fd, file);
1691 trace_binder_transaction_fd(t, fp->handle, target_fd);
1692 binder_debug(BINDER_DEBUG_TRANSACTION,
1693 " fd %d -> %d\n", fp->handle, target_fd);
1694 /* TODO: fput? */
1695 fp->binder = 0;
1696 fp->handle = target_fd;
1697 } break;
1698
1699 default:
1700 binder_user_error("%d:%d got transaction with invalid object type, %x\n",
1701 proc->pid, thread->pid, fp->type);
1702 return_error = BR_FAILED_REPLY;
1703 goto err_bad_object_type;
1704 }
1705 }
1706 if (reply) {
1707 BUG_ON(t->buffer->async_transaction != 0);
1708 binder_pop_transaction(target_thread, in_reply_to);
1709 } else if (!(t->flags & TF_ONE_WAY)) {
1710 BUG_ON(t->buffer->async_transaction != 0);
1711 t->need_reply = 1;
1712 t->from_parent = thread->transaction_stack;
1713 thread->transaction_stack = t;
1714 } else {
1715 BUG_ON(target_node == NULL);
1716 BUG_ON(t->buffer->async_transaction != 1);
1717 if (target_node->has_async_transaction) {
1718 target_list = &target_node->async_todo;
1719 target_wait = NULL;
1720 } else
1721 target_node->has_async_transaction = 1;
1722 }
1723 t->work.type = BINDER_WORK_TRANSACTION;
1724 list_add_tail(&t->work.entry, target_list);
1725 tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
1726 list_add_tail(&tcomplete->entry, &thread->todo);
1727 if (target_wait)
1728 wake_up_interruptible(target_wait);
1729 return;
1730
1731 err_get_unused_fd_failed:
1732 err_fget_failed:
1733 err_fd_not_allowed:
1734 err_binder_get_ref_for_node_failed:
1735 err_binder_get_ref_failed:
1736 err_binder_new_node_failed:
1737 err_bad_object_type:
1738 err_bad_offset:
1739 err_copy_data_failed:
1740 trace_binder_transaction_failed_buffer_release(t->buffer);
1741 binder_transaction_buffer_release(target_proc, t->buffer, offp);
1742 t->buffer->transaction = NULL;
1743 binder_free_buf(target_proc, t->buffer);
1744 err_binder_alloc_buf_failed:
1745 kfree(tcomplete);
1746 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
1747 err_alloc_tcomplete_failed:
1748 kfree(t);
1749 binder_stats_deleted(BINDER_STAT_TRANSACTION);
1750 err_alloc_t_failed:
1751 err_bad_call_stack:
1752 err_empty_call_stack:
1753 err_dead_binder:
1754 err_invalid_target_handle:
1755 err_no_context_mgr_node:
1756 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1757 "%d:%d transaction failed %d, size %lld-%lld\n",
1758 proc->pid, thread->pid, return_error,
1759 (u64)tr->data_size, (u64)tr->offsets_size);
1760
1761 {
1762 struct binder_transaction_log_entry *fe;
1763
1764 fe = binder_transaction_log_add(&binder_transaction_log_failed);
1765 *fe = *e;
1766 }
1767
1768 BUG_ON(thread->return_error != BR_OK);
1769 if (in_reply_to) {
1770 thread->return_error = BR_TRANSACTION_COMPLETE;
1771 binder_send_failed_reply(in_reply_to, return_error);
1772 } else
1773 thread->return_error = return_error;
1774 }
1775
1776 static int binder_thread_write(struct binder_proc *proc,
1777 struct binder_thread *thread,
1778 binder_uintptr_t binder_buffer, size_t size,
1779 binder_size_t *consumed)
1780 {
1781 uint32_t cmd;
1782 void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
1783 void __user *ptr = buffer + *consumed;
1784 void __user *end = buffer + size;
1785
1786 while (ptr < end && thread->return_error == BR_OK) {
1787 if (get_user(cmd, (uint32_t __user *)ptr))
1788 return -EFAULT;
1789 ptr += sizeof(uint32_t);
1790 trace_binder_command(cmd);
1791 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
1792 binder_stats.bc[_IOC_NR(cmd)]++;
1793 proc->stats.bc[_IOC_NR(cmd)]++;
1794 thread->stats.bc[_IOC_NR(cmd)]++;
1795 }
1796 switch (cmd) {
1797 case BC_INCREFS:
1798 case BC_ACQUIRE:
1799 case BC_RELEASE:
1800 case BC_DECREFS: {
1801 uint32_t target;
1802 struct binder_ref *ref;
1803 const char *debug_string;
1804
1805 if (get_user(target, (uint32_t __user *)ptr))
1806 return -EFAULT;
1807 ptr += sizeof(uint32_t);
1808 if (target == 0 && binder_context_mgr_node &&
1809 (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
1810 ref = binder_get_ref_for_node(proc,
1811 binder_context_mgr_node);
1812 if (ref->desc != target) {
1813 binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
1814 proc->pid, thread->pid,
1815 ref->desc);
1816 }
1817 } else
1818 ref = binder_get_ref(proc, target,
1819 cmd == BC_ACQUIRE ||
1820 cmd == BC_RELEASE);
1821 if (ref == NULL) {
1822 binder_user_error("%d:%d refcount change on invalid ref %d\n",
1823 proc->pid, thread->pid, target);
1824 break;
1825 }
1826 switch (cmd) {
1827 case BC_INCREFS:
1828 debug_string = "IncRefs";
1829 binder_inc_ref(ref, 0, NULL);
1830 break;
1831 case BC_ACQUIRE:
1832 debug_string = "Acquire";
1833 binder_inc_ref(ref, 1, NULL);
1834 break;
1835 case BC_RELEASE:
1836 debug_string = "Release";
1837 binder_dec_ref(ref, 1);
1838 break;
1839 case BC_DECREFS:
1840 default:
1841 debug_string = "DecRefs";
1842 binder_dec_ref(ref, 0);
1843 break;
1844 }
1845 binder_debug(BINDER_DEBUG_USER_REFS,
1846 "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
1847 proc->pid, thread->pid, debug_string, ref->debug_id,
1848 ref->desc, ref->strong, ref->weak, ref->node->debug_id);
1849 break;
1850 }
1851 case BC_INCREFS_DONE:
1852 case BC_ACQUIRE_DONE: {
1853 binder_uintptr_t node_ptr;
1854 binder_uintptr_t cookie;
1855 struct binder_node *node;
1856
1857 if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
1858 return -EFAULT;
1859 ptr += sizeof(binder_uintptr_t);
1860 if (get_user(cookie, (binder_uintptr_t __user *)ptr))
1861 return -EFAULT;
1862 ptr += sizeof(binder_uintptr_t);
1863 node = binder_get_node(proc, node_ptr);
1864 if (node == NULL) {
1865 binder_user_error("%d:%d %s u%016llx no match\n",
1866 proc->pid, thread->pid,
1867 cmd == BC_INCREFS_DONE ?
1868 "BC_INCREFS_DONE" :
1869 "BC_ACQUIRE_DONE",
1870 (u64)node_ptr);
1871 break;
1872 }
1873 if (cookie != node->cookie) {
1874 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
1875 proc->pid, thread->pid,
1876 cmd == BC_INCREFS_DONE ?
1877 "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1878 (u64)node_ptr, node->debug_id,
1879 (u64)cookie, (u64)node->cookie);
1880 break;
1881 }
1882 if (cmd == BC_ACQUIRE_DONE) {
1883 if (node->pending_strong_ref == 0) {
1884 binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
1885 proc->pid, thread->pid,
1886 node->debug_id);
1887 break;
1888 }
1889 node->pending_strong_ref = 0;
1890 } else {
1891 if (node->pending_weak_ref == 0) {
1892 binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
1893 proc->pid, thread->pid,
1894 node->debug_id);
1895 break;
1896 }
1897 node->pending_weak_ref = 0;
1898 }
1899 binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
1900 binder_debug(BINDER_DEBUG_USER_REFS,
1901 "%d:%d %s node %d ls %d lw %d\n",
1902 proc->pid, thread->pid,
1903 cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
1904 node->debug_id, node->local_strong_refs, node->local_weak_refs);
1905 break;
1906 }
1907 case BC_ATTEMPT_ACQUIRE:
1908 pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
1909 return -EINVAL;
1910 case BC_ACQUIRE_RESULT:
1911 pr_err("BC_ACQUIRE_RESULT not supported\n");
1912 return -EINVAL;
1913
1914 case BC_FREE_BUFFER: {
1915 binder_uintptr_t data_ptr;
1916 struct binder_buffer *buffer;
1917
1918 if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
1919 return -EFAULT;
1920 ptr += sizeof(binder_uintptr_t);
1921
1922 buffer = binder_buffer_lookup(proc, data_ptr);
1923 if (buffer == NULL) {
1924 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
1925 proc->pid, thread->pid, (u64)data_ptr);
1926 break;
1927 }
1928 if (!buffer->allow_user_free) {
1929 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
1930 proc->pid, thread->pid, (u64)data_ptr);
1931 break;
1932 }
1933 binder_debug(BINDER_DEBUG_FREE_BUFFER,
1934 "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
1935 proc->pid, thread->pid, (u64)data_ptr,
1936 buffer->debug_id,
1937 buffer->transaction ? "active" : "finished");
1938
1939 if (buffer->transaction) {
1940 buffer->transaction->buffer = NULL;
1941 buffer->transaction = NULL;
1942 }
1943 if (buffer->async_transaction && buffer->target_node) {
1944 BUG_ON(!buffer->target_node->has_async_transaction);
1945 if (list_empty(&buffer->target_node->async_todo))
1946 buffer->target_node->has_async_transaction = 0;
1947 else
1948 list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
1949 }
1950 trace_binder_transaction_buffer_release(buffer);
1951 binder_transaction_buffer_release(proc, buffer, NULL);
1952 binder_free_buf(proc, buffer);
1953 break;
1954 }
1955
1956 case BC_TRANSACTION:
1957 case BC_REPLY: {
1958 struct binder_transaction_data tr;
1959
1960 if (copy_from_user(&tr, ptr, sizeof(tr)))
1961 return -EFAULT;
1962 ptr += sizeof(tr);
1963 binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
1964 break;
1965 }
1966
1967 case BC_REGISTER_LOOPER:
1968 binder_debug(BINDER_DEBUG_THREADS,
1969 "%d:%d BC_REGISTER_LOOPER\n",
1970 proc->pid, thread->pid);
1971 if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
1972 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1973 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
1974 proc->pid, thread->pid);
1975 } else if (proc->requested_threads == 0) {
1976 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1977 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
1978 proc->pid, thread->pid);
1979 } else {
1980 proc->requested_threads--;
1981 proc->requested_threads_started++;
1982 }
1983 thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
1984 break;
1985 case BC_ENTER_LOOPER:
1986 binder_debug(BINDER_DEBUG_THREADS,
1987 "%d:%d BC_ENTER_LOOPER\n",
1988 proc->pid, thread->pid);
1989 if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
1990 thread->looper |= BINDER_LOOPER_STATE_INVALID;
1991 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
1992 proc->pid, thread->pid);
1993 }
1994 thread->looper |= BINDER_LOOPER_STATE_ENTERED;
1995 break;
1996 case BC_EXIT_LOOPER:
1997 binder_debug(BINDER_DEBUG_THREADS,
1998 "%d:%d BC_EXIT_LOOPER\n",
1999 proc->pid, thread->pid);
2000 thread->looper |= BINDER_LOOPER_STATE_EXITED;
2001 break;
2002
2003 case BC_REQUEST_DEATH_NOTIFICATION:
2004 case BC_CLEAR_DEATH_NOTIFICATION: {
2005 uint32_t target;
2006 binder_uintptr_t cookie;
2007 struct binder_ref *ref;
2008 struct binder_ref_death *death;
2009
2010 if (get_user(target, (uint32_t __user *)ptr))
2011 return -EFAULT;
2012 ptr += sizeof(uint32_t);
2013 if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2014 return -EFAULT;
2015 ptr += sizeof(binder_uintptr_t);
2016 ref = binder_get_ref(proc, target, false);
2017 if (ref == NULL) {
2018 binder_user_error("%d:%d %s invalid ref %d\n",
2019 proc->pid, thread->pid,
2020 cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2021 "BC_REQUEST_DEATH_NOTIFICATION" :
2022 "BC_CLEAR_DEATH_NOTIFICATION",
2023 target);
2024 break;
2025 }
2026
2027 binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2028 "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
2029 proc->pid, thread->pid,
2030 cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2031 "BC_REQUEST_DEATH_NOTIFICATION" :
2032 "BC_CLEAR_DEATH_NOTIFICATION",
2033 (u64)cookie, ref->debug_id, ref->desc,
2034 ref->strong, ref->weak, ref->node->debug_id);
2035
2036 if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2037 if (ref->death) {
2038 binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2039 proc->pid, thread->pid);
2040 break;
2041 }
2042 death = kzalloc(sizeof(*death), GFP_KERNEL);
2043 if (death == NULL) {
2044 thread->return_error = BR_ERROR;
2045 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2046 "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2047 proc->pid, thread->pid);
2048 break;
2049 }
2050 binder_stats_created(BINDER_STAT_DEATH);
2051 INIT_LIST_HEAD(&death->work.entry);
2052 death->cookie = cookie;
2053 ref->death = death;
2054 if (ref->node->proc == NULL) {
2055 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2056 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2057 list_add_tail(&ref->death->work.entry, &thread->todo);
2058 } else {
2059 list_add_tail(&ref->death->work.entry, &proc->todo);
2060 wake_up_interruptible(&proc->wait);
2061 }
2062 }
2063 } else {
2064 if (ref->death == NULL) {
2065 binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2066 proc->pid, thread->pid);
2067 break;
2068 }
2069 death = ref->death;
2070 if (death->cookie != cookie) {
2071 binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2072 proc->pid, thread->pid,
2073 (u64)death->cookie,
2074 (u64)cookie);
2075 break;
2076 }
2077 ref->death = NULL;
2078 if (list_empty(&death->work.entry)) {
2079 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2080 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2081 list_add_tail(&death->work.entry, &thread->todo);
2082 } else {
2083 list_add_tail(&death->work.entry, &proc->todo);
2084 wake_up_interruptible(&proc->wait);
2085 }
2086 } else {
2087 BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2088 death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2089 }
2090 }
2091 } break;
2092 case BC_DEAD_BINDER_DONE: {
2093 struct binder_work *w;
2094 binder_uintptr_t cookie;
2095 struct binder_ref_death *death = NULL;
2096
2097 if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2098 return -EFAULT;
2099
2100 ptr += sizeof(cookie);
2101 list_for_each_entry(w, &proc->delivered_death, entry) {
2102 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2103
2104 if (tmp_death->cookie == cookie) {
2105 death = tmp_death;
2106 break;
2107 }
2108 }
2109 binder_debug(BINDER_DEBUG_DEAD_BINDER,
2110 "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2111 proc->pid, thread->pid, (u64)cookie,
2112 death);
2113 if (death == NULL) {
2114 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2115 proc->pid, thread->pid, (u64)cookie);
2116 break;
2117 }
2118
2119 list_del_init(&death->work.entry);
2120 if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2121 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2122 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2123 list_add_tail(&death->work.entry, &thread->todo);
2124 } else {
2125 list_add_tail(&death->work.entry, &proc->todo);
2126 wake_up_interruptible(&proc->wait);
2127 }
2128 }
2129 } break;
2130
2131 default:
2132 pr_err("%d:%d unknown command %d\n",
2133 proc->pid, thread->pid, cmd);
2134 return -EINVAL;
2135 }
2136 *consumed = ptr - buffer;
2137 }
2138 return 0;
2139 }
2140
2141 static void binder_stat_br(struct binder_proc *proc,
2142 struct binder_thread *thread, uint32_t cmd)
2143 {
2144 trace_binder_return(cmd);
2145 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2146 binder_stats.br[_IOC_NR(cmd)]++;
2147 proc->stats.br[_IOC_NR(cmd)]++;
2148 thread->stats.br[_IOC_NR(cmd)]++;
2149 }
2150 }
2151
2152 static int binder_has_proc_work(struct binder_proc *proc,
2153 struct binder_thread *thread)
2154 {
2155 return !list_empty(&proc->todo) ||
2156 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2157 }
2158
2159 static int binder_has_thread_work(struct binder_thread *thread)
2160 {
2161 return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2162 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2163 }
2164
2165 static int binder_thread_read(struct binder_proc *proc,
2166 struct binder_thread *thread,
2167 binder_uintptr_t binder_buffer, size_t size,
2168 binder_size_t *consumed, int non_block)
2169 {
2170 void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2171 void __user *ptr = buffer + *consumed;
2172 void __user *end = buffer + size;
2173
2174 int ret = 0;
2175 int wait_for_proc_work;
2176
2177 if (*consumed == 0) {
2178 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2179 return -EFAULT;
2180 ptr += sizeof(uint32_t);
2181 }
2182
2183 retry:
2184 wait_for_proc_work = thread->transaction_stack == NULL &&
2185 list_empty(&thread->todo);
2186
2187 if (thread->return_error != BR_OK && ptr < end) {
2188 if (thread->return_error2 != BR_OK) {
2189 if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2190 return -EFAULT;
2191 ptr += sizeof(uint32_t);
2192 binder_stat_br(proc, thread, thread->return_error2);
2193 if (ptr == end)
2194 goto done;
2195 thread->return_error2 = BR_OK;
2196 }
2197 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2198 return -EFAULT;
2199 ptr += sizeof(uint32_t);
2200 binder_stat_br(proc, thread, thread->return_error);
2201 thread->return_error = BR_OK;
2202 goto done;
2203 }
2204
2205
2206 thread->looper |= BINDER_LOOPER_STATE_WAITING;
2207 if (wait_for_proc_work)
2208 proc->ready_threads++;
2209
2210 binder_unlock(__func__);
2211
2212 trace_binder_wait_for_work(wait_for_proc_work,
2213 !!thread->transaction_stack,
2214 !list_empty(&thread->todo));
2215 if (wait_for_proc_work) {
2216 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2217 BINDER_LOOPER_STATE_ENTERED))) {
2218 binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2219 proc->pid, thread->pid, thread->looper);
2220 wait_event_interruptible(binder_user_error_wait,
2221 binder_stop_on_user_error < 2);
2222 }
2223 binder_set_nice(proc->default_priority);
2224 if (non_block) {
2225 if (!binder_has_proc_work(proc, thread))
2226 ret = -EAGAIN;
2227 } else
2228 ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2229 } else {
2230 if (non_block) {
2231 if (!binder_has_thread_work(thread))
2232 ret = -EAGAIN;
2233 } else
2234 ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2235 }
2236
2237 binder_lock(__func__);
2238
2239 if (wait_for_proc_work)
2240 proc->ready_threads--;
2241 thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2242
2243 if (ret)
2244 return ret;
2245
2246 while (1) {
2247 uint32_t cmd;
2248 struct binder_transaction_data tr;
2249 struct binder_work *w;
2250 struct binder_transaction *t = NULL;
2251
2252 if (!list_empty(&thread->todo)) {
2253 w = list_first_entry(&thread->todo, struct binder_work,
2254 entry);
2255 } else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2256 w = list_first_entry(&proc->todo, struct binder_work,
2257 entry);
2258 } else {
2259 /* no data added */
2260 if (ptr - buffer == 4 &&
2261 !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2262 goto retry;
2263 break;
2264 }
2265
2266 if (end - ptr < sizeof(tr) + 4)
2267 break;
2268
2269 switch (w->type) {
2270 case BINDER_WORK_TRANSACTION: {
2271 t = container_of(w, struct binder_transaction, work);
2272 } break;
2273 case BINDER_WORK_TRANSACTION_COMPLETE: {
2274 cmd = BR_TRANSACTION_COMPLETE;
2275 if (put_user(cmd, (uint32_t __user *)ptr))
2276 return -EFAULT;
2277 ptr += sizeof(uint32_t);
2278
2279 binder_stat_br(proc, thread, cmd);
2280 binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2281 "%d:%d BR_TRANSACTION_COMPLETE\n",
2282 proc->pid, thread->pid);
2283
2284 list_del(&w->entry);
2285 kfree(w);
2286 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2287 } break;
2288 case BINDER_WORK_NODE: {
2289 struct binder_node *node = container_of(w, struct binder_node, work);
2290 uint32_t cmd = BR_NOOP;
2291 const char *cmd_name;
2292 int strong = node->internal_strong_refs || node->local_strong_refs;
2293 int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2294
2295 if (weak && !node->has_weak_ref) {
2296 cmd = BR_INCREFS;
2297 cmd_name = "BR_INCREFS";
2298 node->has_weak_ref = 1;
2299 node->pending_weak_ref = 1;
2300 node->local_weak_refs++;
2301 } else if (strong && !node->has_strong_ref) {
2302 cmd = BR_ACQUIRE;
2303 cmd_name = "BR_ACQUIRE";
2304 node->has_strong_ref = 1;
2305 node->pending_strong_ref = 1;
2306 node->local_strong_refs++;
2307 } else if (!strong && node->has_strong_ref) {
2308 cmd = BR_RELEASE;
2309 cmd_name = "BR_RELEASE";
2310 node->has_strong_ref = 0;
2311 } else if (!weak && node->has_weak_ref) {
2312 cmd = BR_DECREFS;
2313 cmd_name = "BR_DECREFS";
2314 node->has_weak_ref = 0;
2315 }
2316 if (cmd != BR_NOOP) {
2317 if (put_user(cmd, (uint32_t __user *)ptr))
2318 return -EFAULT;
2319 ptr += sizeof(uint32_t);
2320 if (put_user(node->ptr,
2321 (binder_uintptr_t __user *)ptr))
2322 return -EFAULT;
2323 ptr += sizeof(binder_uintptr_t);
2324 if (put_user(node->cookie,
2325 (binder_uintptr_t __user *)ptr))
2326 return -EFAULT;
2327 ptr += sizeof(binder_uintptr_t);
2328
2329 binder_stat_br(proc, thread, cmd);
2330 binder_debug(BINDER_DEBUG_USER_REFS,
2331 "%d:%d %s %d u%016llx c%016llx\n",
2332 proc->pid, thread->pid, cmd_name,
2333 node->debug_id,
2334 (u64)node->ptr, (u64)node->cookie);
2335 } else {
2336 list_del_init(&w->entry);
2337 if (!weak && !strong) {
2338 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2339 "%d:%d node %d u%016llx c%016llx deleted\n",
2340 proc->pid, thread->pid,
2341 node->debug_id,
2342 (u64)node->ptr,
2343 (u64)node->cookie);
2344 rb_erase(&node->rb_node, &proc->nodes);
2345 kfree(node);
2346 binder_stats_deleted(BINDER_STAT_NODE);
2347 } else {
2348 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2349 "%d:%d node %d u%016llx c%016llx state unchanged\n",
2350 proc->pid, thread->pid,
2351 node->debug_id,
2352 (u64)node->ptr,
2353 (u64)node->cookie);
2354 }
2355 }
2356 } break;
2357 case BINDER_WORK_DEAD_BINDER:
2358 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2359 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2360 struct binder_ref_death *death;
2361 uint32_t cmd;
2362
2363 death = container_of(w, struct binder_ref_death, work);
2364 if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2365 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2366 else
2367 cmd = BR_DEAD_BINDER;
2368 if (put_user(cmd, (uint32_t __user *)ptr))
2369 return -EFAULT;
2370 ptr += sizeof(uint32_t);
2371 if (put_user(death->cookie,
2372 (binder_uintptr_t __user *)ptr))
2373 return -EFAULT;
2374 ptr += sizeof(binder_uintptr_t);
2375 binder_stat_br(proc, thread, cmd);
2376 binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2377 "%d:%d %s %016llx\n",
2378 proc->pid, thread->pid,
2379 cmd == BR_DEAD_BINDER ?
2380 "BR_DEAD_BINDER" :
2381 "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2382 (u64)death->cookie);
2383
2384 if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2385 list_del(&w->entry);
2386 kfree(death);
2387 binder_stats_deleted(BINDER_STAT_DEATH);
2388 } else
2389 list_move(&w->entry, &proc->delivered_death);
2390 if (cmd == BR_DEAD_BINDER)
2391 goto done; /* DEAD_BINDER notifications can cause transactions */
2392 } break;
2393 }
2394
2395 if (!t)
2396 continue;
2397
2398 BUG_ON(t->buffer == NULL);
2399 if (t->buffer->target_node) {
2400 struct binder_node *target_node = t->buffer->target_node;
2401
2402 tr.target.ptr = target_node->ptr;
2403 tr.cookie = target_node->cookie;
2404 t->saved_priority = task_nice(current);
2405 if (t->priority < target_node->min_priority &&
2406 !(t->flags & TF_ONE_WAY))
2407 binder_set_nice(t->priority);
2408 else if (!(t->flags & TF_ONE_WAY) ||
2409 t->saved_priority > target_node->min_priority)
2410 binder_set_nice(target_node->min_priority);
2411 cmd = BR_TRANSACTION;
2412 } else {
2413 tr.target.ptr = 0;
2414 tr.cookie = 0;
2415 cmd = BR_REPLY;
2416 }
2417 tr.code = t->code;
2418 tr.flags = t->flags;
2419 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2420
2421 if (t->from) {
2422 struct task_struct *sender = t->from->proc->tsk;
2423
2424 tr.sender_pid = task_tgid_nr_ns(sender,
2425 task_active_pid_ns(current));
2426 } else {
2427 tr.sender_pid = 0;
2428 }
2429
2430 tr.data_size = t->buffer->data_size;
2431 tr.offsets_size = t->buffer->offsets_size;
2432 tr.data.ptr.buffer = (binder_uintptr_t)(
2433 (uintptr_t)t->buffer->data +
2434 proc->user_buffer_offset);
2435 tr.data.ptr.offsets = tr.data.ptr.buffer +
2436 ALIGN(t->buffer->data_size,
2437 sizeof(void *));
2438
2439 if (put_user(cmd, (uint32_t __user *)ptr))
2440 return -EFAULT;
2441 ptr += sizeof(uint32_t);
2442 if (copy_to_user(ptr, &tr, sizeof(tr)))
2443 return -EFAULT;
2444 ptr += sizeof(tr);
2445
2446 trace_binder_transaction_received(t);
2447 binder_stat_br(proc, thread, cmd);
2448 binder_debug(BINDER_DEBUG_TRANSACTION,
2449 "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2450 proc->pid, thread->pid,
2451 (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2452 "BR_REPLY",
2453 t->debug_id, t->from ? t->from->proc->pid : 0,
2454 t->from ? t->from->pid : 0, cmd,
2455 t->buffer->data_size, t->buffer->offsets_size,
2456 (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2457
2458 list_del(&t->work.entry);
2459 t->buffer->allow_user_free = 1;
2460 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2461 t->to_parent = thread->transaction_stack;
2462 t->to_thread = thread;
2463 thread->transaction_stack = t;
2464 } else {
2465 t->buffer->transaction = NULL;
2466 kfree(t);
2467 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2468 }
2469 break;
2470 }
2471
2472 done:
2473
2474 *consumed = ptr - buffer;
2475 if (proc->requested_threads + proc->ready_threads == 0 &&
2476 proc->requested_threads_started < proc->max_threads &&
2477 (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2478 BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2479 /*spawn a new thread if we leave this out */) {
2480 proc->requested_threads++;
2481 binder_debug(BINDER_DEBUG_THREADS,
2482 "%d:%d BR_SPAWN_LOOPER\n",
2483 proc->pid, thread->pid);
2484 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2485 return -EFAULT;
2486 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2487 }
2488 return 0;
2489 }
2490
2491 static void binder_release_work(struct list_head *list)
2492 {
2493 struct binder_work *w;
2494
2495 while (!list_empty(list)) {
2496 w = list_first_entry(list, struct binder_work, entry);
2497 list_del_init(&w->entry);
2498 switch (w->type) {
2499 case BINDER_WORK_TRANSACTION: {
2500 struct binder_transaction *t;
2501
2502 t = container_of(w, struct binder_transaction, work);
2503 if (t->buffer->target_node &&
2504 !(t->flags & TF_ONE_WAY)) {
2505 binder_send_failed_reply(t, BR_DEAD_REPLY);
2506 } else {
2507 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2508 "undelivered transaction %d\n",
2509 t->debug_id);
2510 t->buffer->transaction = NULL;
2511 kfree(t);
2512 binder_stats_deleted(BINDER_STAT_TRANSACTION);
2513 }
2514 } break;
2515 case BINDER_WORK_TRANSACTION_COMPLETE: {
2516 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2517 "undelivered TRANSACTION_COMPLETE\n");
2518 kfree(w);
2519 binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2520 } break;
2521 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2522 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2523 struct binder_ref_death *death;
2524
2525 death = container_of(w, struct binder_ref_death, work);
2526 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2527 "undelivered death notification, %016llx\n",
2528 (u64)death->cookie);
2529 kfree(death);
2530 binder_stats_deleted(BINDER_STAT_DEATH);
2531 } break;
2532 default:
2533 pr_err("unexpected work type, %d, not freed\n",
2534 w->type);
2535 break;
2536 }
2537 }
2538
2539 }
2540
2541 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
2542 {
2543 struct binder_thread *thread = NULL;
2544 struct rb_node *parent = NULL;
2545 struct rb_node **p = &proc->threads.rb_node;
2546
2547 while (*p) {
2548 parent = *p;
2549 thread = rb_entry(parent, struct binder_thread, rb_node);
2550
2551 if (current->pid < thread->pid)
2552 p = &(*p)->rb_left;
2553 else if (current->pid > thread->pid)
2554 p = &(*p)->rb_right;
2555 else
2556 break;
2557 }
2558 if (*p == NULL) {
2559 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
2560 if (thread == NULL)
2561 return NULL;
2562 binder_stats_created(BINDER_STAT_THREAD);
2563 thread->proc = proc;
2564 thread->pid = current->pid;
2565 init_waitqueue_head(&thread->wait);
2566 INIT_LIST_HEAD(&thread->todo);
2567 rb_link_node(&thread->rb_node, parent, p);
2568 rb_insert_color(&thread->rb_node, &proc->threads);
2569 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
2570 thread->return_error = BR_OK;
2571 thread->return_error2 = BR_OK;
2572 }
2573 return thread;
2574 }
2575
2576 static int binder_free_thread(struct binder_proc *proc,
2577 struct binder_thread *thread)
2578 {
2579 struct binder_transaction *t;
2580 struct binder_transaction *send_reply = NULL;
2581 int active_transactions = 0;
2582
2583 rb_erase(&thread->rb_node, &proc->threads);
2584 t = thread->transaction_stack;
2585 if (t && t->to_thread == thread)
2586 send_reply = t;
2587 while (t) {
2588 active_transactions++;
2589 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2590 "release %d:%d transaction %d %s, still active\n",
2591 proc->pid, thread->pid,
2592 t->debug_id,
2593 (t->to_thread == thread) ? "in" : "out");
2594
2595 if (t->to_thread == thread) {
2596 t->to_proc = NULL;
2597 t->to_thread = NULL;
2598 if (t->buffer) {
2599 t->buffer->transaction = NULL;
2600 t->buffer = NULL;
2601 }
2602 t = t->to_parent;
2603 } else if (t->from == thread) {
2604 t->from = NULL;
2605 t = t->from_parent;
2606 } else
2607 BUG();
2608 }
2609 if (send_reply)
2610 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
2611 binder_release_work(&thread->todo);
2612 kfree(thread);
2613 binder_stats_deleted(BINDER_STAT_THREAD);
2614 return active_transactions;
2615 }
2616
2617 static unsigned int binder_poll(struct file *filp,
2618 struct poll_table_struct *wait)
2619 {
2620 struct binder_proc *proc = filp->private_data;
2621 struct binder_thread *thread = NULL;
2622 int wait_for_proc_work;
2623
2624 binder_lock(__func__);
2625
2626 thread = binder_get_thread(proc);
2627
2628 wait_for_proc_work = thread->transaction_stack == NULL &&
2629 list_empty(&thread->todo) && thread->return_error == BR_OK;
2630
2631 binder_unlock(__func__);
2632
2633 if (wait_for_proc_work) {
2634 if (binder_has_proc_work(proc, thread))
2635 return POLLIN;
2636 poll_wait(filp, &proc->wait, wait);
2637 if (binder_has_proc_work(proc, thread))
2638 return POLLIN;
2639 } else {
2640 if (binder_has_thread_work(thread))
2641 return POLLIN;
2642 poll_wait(filp, &thread->wait, wait);
2643 if (binder_has_thread_work(thread))
2644 return POLLIN;
2645 }
2646 return 0;
2647 }
2648
2649 static int binder_ioctl_write_read(struct file *filp,
2650 unsigned int cmd, unsigned long arg,
2651 struct binder_thread *thread)
2652 {
2653 int ret = 0;
2654 struct binder_proc *proc = filp->private_data;
2655 unsigned int size = _IOC_SIZE(cmd);
2656 void __user *ubuf = (void __user *)arg;
2657 struct binder_write_read bwr;
2658
2659 if (size != sizeof(struct binder_write_read)) {
2660 ret = -EINVAL;
2661 goto out;
2662 }
2663 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
2664 ret = -EFAULT;
2665 goto out;
2666 }
2667 binder_debug(BINDER_DEBUG_READ_WRITE,
2668 "%d:%d write %lld at %016llx, read %lld at %016llx\n",
2669 proc->pid, thread->pid,
2670 (u64)bwr.write_size, (u64)bwr.write_buffer,
2671 (u64)bwr.read_size, (u64)bwr.read_buffer);
2672
2673 if (bwr.write_size > 0) {
2674 ret = binder_thread_write(proc, thread,
2675 bwr.write_buffer,
2676 bwr.write_size,
2677 &bwr.write_consumed);
2678 trace_binder_write_done(ret);
2679 if (ret < 0) {
2680 bwr.read_consumed = 0;
2681 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2682 ret = -EFAULT;
2683 goto out;
2684 }
2685 }
2686 if (bwr.read_size > 0) {
2687 ret = binder_thread_read(proc, thread, bwr.read_buffer,
2688 bwr.read_size,
2689 &bwr.read_consumed,
2690 filp->f_flags & O_NONBLOCK);
2691 trace_binder_read_done(ret);
2692 if (!list_empty(&proc->todo))
2693 wake_up_interruptible(&proc->wait);
2694 if (ret < 0) {
2695 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
2696 ret = -EFAULT;
2697 goto out;
2698 }
2699 }
2700 binder_debug(BINDER_DEBUG_READ_WRITE,
2701 "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
2702 proc->pid, thread->pid,
2703 (u64)bwr.write_consumed, (u64)bwr.write_size,
2704 (u64)bwr.read_consumed, (u64)bwr.read_size);
2705 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
2706 ret = -EFAULT;
2707 goto out;
2708 }
2709 out:
2710 return ret;
2711 }
2712
2713 static int binder_ioctl_set_ctx_mgr(struct file *filp)
2714 {
2715 int ret = 0;
2716 struct binder_proc *proc = filp->private_data;
2717 kuid_t curr_euid = current_euid();
2718
2719 if (binder_context_mgr_node != NULL) {
2720 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
2721 ret = -EBUSY;
2722 goto out;
2723 }
2724 ret = security_binder_set_context_mgr(proc->tsk);
2725 if (ret < 0)
2726 goto out;
2727 if (uid_valid(binder_context_mgr_uid)) {
2728 if (!uid_eq(binder_context_mgr_uid, curr_euid)) {
2729 pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
2730 from_kuid(&init_user_ns, curr_euid),
2731 from_kuid(&init_user_ns,
2732 binder_context_mgr_uid));
2733 ret = -EPERM;
2734 goto out;
2735 }
2736 } else {
2737 binder_context_mgr_uid = curr_euid;
2738 }
2739 binder_context_mgr_node = binder_new_node(proc, 0, 0);
2740 if (binder_context_mgr_node == NULL) {
2741 ret = -ENOMEM;
2742 goto out;
2743 }
2744 binder_context_mgr_node->local_weak_refs++;
2745 binder_context_mgr_node->local_strong_refs++;
2746 binder_context_mgr_node->has_strong_ref = 1;
2747 binder_context_mgr_node->has_weak_ref = 1;
2748 out:
2749 return ret;
2750 }
2751
2752 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2753 {
2754 int ret;
2755 struct binder_proc *proc = filp->private_data;
2756 struct binder_thread *thread;
2757 unsigned int size = _IOC_SIZE(cmd);
2758 void __user *ubuf = (void __user *)arg;
2759
2760 /*pr_info("binder_ioctl: %d:%d %x %lx\n",
2761 proc->pid, current->pid, cmd, arg);*/
2762
2763 if (unlikely(current->mm != proc->vma_vm_mm)) {
2764 pr_err("current mm mismatch proc mm\n");
2765 return -EINVAL;
2766 }
2767 trace_binder_ioctl(cmd, arg);
2768
2769 ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2770 if (ret)
2771 goto err_unlocked;
2772
2773 binder_lock(__func__);
2774 thread = binder_get_thread(proc);
2775 if (thread == NULL) {
2776 ret = -ENOMEM;
2777 goto err;
2778 }
2779
2780 switch (cmd) {
2781 case BINDER_WRITE_READ:
2782 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
2783 if (ret)
2784 goto err;
2785 break;
2786 case BINDER_SET_MAX_THREADS:
2787 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
2788 ret = -EINVAL;
2789 goto err;
2790 }
2791 break;
2792 case BINDER_SET_CONTEXT_MGR:
2793 ret = binder_ioctl_set_ctx_mgr(filp);
2794 if (ret)
2795 goto err;
2796 break;
2797 case BINDER_THREAD_EXIT:
2798 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
2799 proc->pid, thread->pid);
2800 binder_free_thread(proc, thread);
2801 thread = NULL;
2802 break;
2803 case BINDER_VERSION: {
2804 struct binder_version __user *ver = ubuf;
2805
2806 if (size != sizeof(struct binder_version)) {
2807 ret = -EINVAL;
2808 goto err;
2809 }
2810 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
2811 &ver->protocol_version)) {
2812 ret = -EINVAL;
2813 goto err;
2814 }
2815 break;
2816 }
2817 default:
2818 ret = -EINVAL;
2819 goto err;
2820 }
2821 ret = 0;
2822 err:
2823 if (thread)
2824 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
2825 binder_unlock(__func__);
2826 wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
2827 if (ret && ret != -ERESTARTSYS)
2828 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
2829 err_unlocked:
2830 trace_binder_ioctl_done(ret);
2831 return ret;
2832 }
2833
2834 static void binder_vma_open(struct vm_area_struct *vma)
2835 {
2836 struct binder_proc *proc = vma->vm_private_data;
2837
2838 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2839 "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2840 proc->pid, vma->vm_start, vma->vm_end,
2841 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2842 (unsigned long)pgprot_val(vma->vm_page_prot));
2843 }
2844
2845 static void binder_vma_close(struct vm_area_struct *vma)
2846 {
2847 struct binder_proc *proc = vma->vm_private_data;
2848
2849 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2850 "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
2851 proc->pid, vma->vm_start, vma->vm_end,
2852 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2853 (unsigned long)pgprot_val(vma->vm_page_prot));
2854 proc->vma = NULL;
2855 proc->vma_vm_mm = NULL;
2856 binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
2857 }
2858
2859 static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2860 {
2861 return VM_FAULT_SIGBUS;
2862 }
2863
2864 static const struct vm_operations_struct binder_vm_ops = {
2865 .open = binder_vma_open,
2866 .close = binder_vma_close,
2867 .fault = binder_vm_fault,
2868 };
2869
2870 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
2871 {
2872 int ret;
2873 struct vm_struct *area;
2874 struct binder_proc *proc = filp->private_data;
2875 const char *failure_string;
2876 struct binder_buffer *buffer;
2877
2878 if (proc->tsk != current)
2879 return -EINVAL;
2880
2881 if ((vma->vm_end - vma->vm_start) > SZ_4M)
2882 vma->vm_end = vma->vm_start + SZ_4M;
2883
2884 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
2885 "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
2886 proc->pid, vma->vm_start, vma->vm_end,
2887 (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
2888 (unsigned long)pgprot_val(vma->vm_page_prot));
2889
2890 if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
2891 ret = -EPERM;
2892 failure_string = "bad vm_flags";
2893 goto err_bad_arg;
2894 }
2895 vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
2896
2897 mutex_lock(&binder_mmap_lock);
2898 if (proc->buffer) {
2899 ret = -EBUSY;
2900 failure_string = "already mapped";
2901 goto err_already_mapped;
2902 }
2903
2904 area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
2905 if (area == NULL) {
2906 ret = -ENOMEM;
2907 failure_string = "get_vm_area";
2908 goto err_get_vm_area_failed;
2909 }
2910 proc->buffer = area->addr;
2911 proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
2912 mutex_unlock(&binder_mmap_lock);
2913
2914 #ifdef CONFIG_CPU_CACHE_VIPT
2915 if (cache_is_vipt_aliasing()) {
2916 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
2917 pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
2918 vma->vm_start += PAGE_SIZE;
2919 }
2920 }
2921 #endif
2922 proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
2923 if (proc->pages == NULL) {
2924 ret = -ENOMEM;
2925 failure_string = "alloc page array";
2926 goto err_alloc_pages_failed;
2927 }
2928 proc->buffer_size = vma->vm_end - vma->vm_start;
2929
2930 vma->vm_ops = &binder_vm_ops;
2931 vma->vm_private_data = proc;
2932
2933 if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
2934 ret = -ENOMEM;
2935 failure_string = "alloc small buf";
2936 goto err_alloc_small_buf_failed;
2937 }
2938 buffer = proc->buffer;
2939 INIT_LIST_HEAD(&proc->buffers);
2940 list_add(&buffer->entry, &proc->buffers);
2941 buffer->free = 1;
2942 binder_insert_free_buffer(proc, buffer);
2943 proc->free_async_space = proc->buffer_size / 2;
2944 barrier();
2945 proc->files = get_files_struct(current);
2946 proc->vma = vma;
2947 proc->vma_vm_mm = vma->vm_mm;
2948
2949 /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
2950 proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
2951 return 0;
2952
2953 err_alloc_small_buf_failed:
2954 kfree(proc->pages);
2955 proc->pages = NULL;
2956 err_alloc_pages_failed:
2957 mutex_lock(&binder_mmap_lock);
2958 vfree(proc->buffer);
2959 proc->buffer = NULL;
2960 err_get_vm_area_failed:
2961 err_already_mapped:
2962 mutex_unlock(&binder_mmap_lock);
2963 err_bad_arg:
2964 pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
2965 proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
2966 return ret;
2967 }
2968
2969 static int binder_open(struct inode *nodp, struct file *filp)
2970 {
2971 struct binder_proc *proc;
2972
2973 binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
2974 current->group_leader->pid, current->pid);
2975
2976 proc = kzalloc(sizeof(*proc), GFP_KERNEL);
2977 if (proc == NULL)
2978 return -ENOMEM;
2979 get_task_struct(current);
2980 proc->tsk = current;
2981 proc->vma_vm_mm = current->mm;
2982 INIT_LIST_HEAD(&proc->todo);
2983 init_waitqueue_head(&proc->wait);
2984 proc->default_priority = task_nice(current);
2985
2986 binder_lock(__func__);
2987
2988 binder_stats_created(BINDER_STAT_PROC);
2989 hlist_add_head(&proc->proc_node, &binder_procs);
2990 proc->pid = current->group_leader->pid;
2991 INIT_LIST_HEAD(&proc->delivered_death);
2992 filp->private_data = proc;
2993
2994 binder_unlock(__func__);
2995
2996 if (binder_debugfs_dir_entry_proc) {
2997 char strbuf[11];
2998
2999 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
3000 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
3001 binder_debugfs_dir_entry_proc, proc, &binder_proc_fops);
3002 }
3003
3004 return 0;
3005 }
3006
3007 static int binder_flush(struct file *filp, fl_owner_t id)
3008 {
3009 struct binder_proc *proc = filp->private_data;
3010
3011 binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
3012
3013 return 0;
3014 }
3015
3016 static void binder_deferred_flush(struct binder_proc *proc)
3017 {
3018 struct rb_node *n;
3019 int wake_count = 0;
3020
3021 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
3022 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
3023
3024 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3025 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
3026 wake_up_interruptible(&thread->wait);
3027 wake_count++;
3028 }
3029 }
3030 wake_up_interruptible_all(&proc->wait);
3031
3032 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3033 "binder_flush: %d woke %d threads\n", proc->pid,
3034 wake_count);
3035 }
3036
3037 static int binder_release(struct inode *nodp, struct file *filp)
3038 {
3039 struct binder_proc *proc = filp->private_data;
3040
3041 debugfs_remove(proc->debugfs_entry);
3042 binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
3043
3044 return 0;
3045 }
3046
3047 static int binder_node_release(struct binder_node *node, int refs)
3048 {
3049 struct binder_ref *ref;
3050 int death = 0;
3051
3052 list_del_init(&node->work.entry);
3053 binder_release_work(&node->async_todo);
3054
3055 if (hlist_empty(&node->refs)) {
3056 kfree(node);
3057 binder_stats_deleted(BINDER_STAT_NODE);
3058
3059 return refs;
3060 }
3061
3062 node->proc = NULL;
3063 node->local_strong_refs = 0;
3064 node->local_weak_refs = 0;
3065 hlist_add_head(&node->dead_node, &binder_dead_nodes);
3066
3067 hlist_for_each_entry(ref, &node->refs, node_entry) {
3068 refs++;
3069
3070 if (!ref->death)
3071 continue;
3072
3073 death++;
3074
3075 if (list_empty(&ref->death->work.entry)) {
3076 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3077 list_add_tail(&ref->death->work.entry,
3078 &ref->proc->todo);
3079 wake_up_interruptible(&ref->proc->wait);
3080 } else
3081 BUG();
3082 }
3083
3084 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3085 "node %d now dead, refs %d, death %d\n",
3086 node->debug_id, refs, death);
3087
3088 return refs;
3089 }
3090
3091 static void binder_deferred_release(struct binder_proc *proc)
3092 {
3093 struct binder_transaction *t;
3094 struct rb_node *n;
3095 int threads, nodes, incoming_refs, outgoing_refs, buffers,
3096 active_transactions, page_count;
3097
3098 BUG_ON(proc->vma);
3099 BUG_ON(proc->files);
3100
3101 hlist_del(&proc->proc_node);
3102
3103 if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
3104 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3105 "%s: %d context_mgr_node gone\n",
3106 __func__, proc->pid);
3107 binder_context_mgr_node = NULL;
3108 }
3109
3110 threads = 0;
3111 active_transactions = 0;
3112 while ((n = rb_first(&proc->threads))) {
3113 struct binder_thread *thread;
3114
3115 thread = rb_entry(n, struct binder_thread, rb_node);
3116 threads++;
3117 active_transactions += binder_free_thread(proc, thread);
3118 }
3119
3120 nodes = 0;
3121 incoming_refs = 0;
3122 while ((n = rb_first(&proc->nodes))) {
3123 struct binder_node *node;
3124
3125 node = rb_entry(n, struct binder_node, rb_node);
3126 nodes++;
3127 rb_erase(&node->rb_node, &proc->nodes);
3128 incoming_refs = binder_node_release(node, incoming_refs);
3129 }
3130
3131 outgoing_refs = 0;
3132 while ((n = rb_first(&proc->refs_by_desc))) {
3133 struct binder_ref *ref;
3134
3135 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3136 outgoing_refs++;
3137 binder_delete_ref(ref);
3138 }
3139
3140 binder_release_work(&proc->todo);
3141 binder_release_work(&proc->delivered_death);
3142
3143 buffers = 0;
3144 while ((n = rb_first(&proc->allocated_buffers))) {
3145 struct binder_buffer *buffer;
3146
3147 buffer = rb_entry(n, struct binder_buffer, rb_node);
3148
3149 t = buffer->transaction;
3150 if (t) {
3151 t->buffer = NULL;
3152 buffer->transaction = NULL;
3153 pr_err("release proc %d, transaction %d, not freed\n",
3154 proc->pid, t->debug_id);
3155 /*BUG();*/
3156 }
3157
3158 binder_free_buf(proc, buffer);
3159 buffers++;
3160 }
3161
3162 binder_stats_deleted(BINDER_STAT_PROC);
3163
3164 page_count = 0;
3165 if (proc->pages) {
3166 int i;
3167
3168 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3169 void *page_addr;
3170
3171 if (!proc->pages[i])
3172 continue;
3173
3174 page_addr = proc->buffer + i * PAGE_SIZE;
3175 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3176 "%s: %d: page %d at %p not freed\n",
3177 __func__, proc->pid, i, page_addr);
3178 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3179 __free_page(proc->pages[i]);
3180 page_count++;
3181 }
3182 kfree(proc->pages);
3183 vfree(proc->buffer);
3184 }
3185
3186 put_task_struct(proc->tsk);
3187
3188 binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3189 "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3190 __func__, proc->pid, threads, nodes, incoming_refs,
3191 outgoing_refs, active_transactions, buffers, page_count);
3192
3193 kfree(proc);
3194 }
3195
3196 static void binder_deferred_func(struct work_struct *work)
3197 {
3198 struct binder_proc *proc;
3199 struct files_struct *files;
3200
3201 int defer;
3202
3203 do {
3204 binder_lock(__func__);
3205 mutex_lock(&binder_deferred_lock);
3206 if (!hlist_empty(&binder_deferred_list)) {
3207 proc = hlist_entry(binder_deferred_list.first,
3208 struct binder_proc, deferred_work_node);
3209 hlist_del_init(&proc->deferred_work_node);
3210 defer = proc->deferred_work;
3211 proc->deferred_work = 0;
3212 } else {
3213 proc = NULL;
3214 defer = 0;
3215 }
3216 mutex_unlock(&binder_deferred_lock);
3217
3218 files = NULL;
3219 if (defer & BINDER_DEFERRED_PUT_FILES) {
3220 files = proc->files;
3221 if (files)
3222 proc->files = NULL;
3223 }
3224
3225 if (defer & BINDER_DEFERRED_FLUSH)
3226 binder_deferred_flush(proc);
3227
3228 if (defer & BINDER_DEFERRED_RELEASE)
3229 binder_deferred_release(proc); /* frees proc */
3230
3231 binder_unlock(__func__);
3232 if (files)
3233 put_files_struct(files);
3234 } while (proc);
3235 }
3236 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3237
3238 static void
3239 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3240 {
3241 mutex_lock(&binder_deferred_lock);
3242 proc->deferred_work |= defer;
3243 if (hlist_unhashed(&proc->deferred_work_node)) {
3244 hlist_add_head(&proc->deferred_work_node,
3245 &binder_deferred_list);
3246 schedule_work(&binder_deferred_work);
3247 }
3248 mutex_unlock(&binder_deferred_lock);
3249 }
3250
3251 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3252 struct binder_transaction *t)
3253 {
3254 seq_printf(m,
3255 "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3256 prefix, t->debug_id, t,
3257 t->from ? t->from->proc->pid : 0,
3258 t->from ? t->from->pid : 0,
3259 t->to_proc ? t->to_proc->pid : 0,
3260 t->to_thread ? t->to_thread->pid : 0,
3261 t->code, t->flags, t->priority, t->need_reply);
3262 if (t->buffer == NULL) {
3263 seq_puts(m, " buffer free\n");
3264 return;
3265 }
3266 if (t->buffer->target_node)
3267 seq_printf(m, " node %d",
3268 t->buffer->target_node->debug_id);
3269 seq_printf(m, " size %zd:%zd data %p\n",
3270 t->buffer->data_size, t->buffer->offsets_size,
3271 t->buffer->data);
3272 }
3273
3274 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3275 struct binder_buffer *buffer)
3276 {
3277 seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3278 prefix, buffer->debug_id, buffer->data,
3279 buffer->data_size, buffer->offsets_size,
3280 buffer->transaction ? "active" : "delivered");
3281 }
3282
3283 static void print_binder_work(struct seq_file *m, const char *prefix,
3284 const char *transaction_prefix,
3285 struct binder_work *w)
3286 {
3287 struct binder_node *node;
3288 struct binder_transaction *t;
3289
3290 switch (w->type) {
3291 case BINDER_WORK_TRANSACTION:
3292 t = container_of(w, struct binder_transaction, work);
3293 print_binder_transaction(m, transaction_prefix, t);
3294 break;
3295 case BINDER_WORK_TRANSACTION_COMPLETE:
3296 seq_printf(m, "%stransaction complete\n", prefix);
3297 break;
3298 case BINDER_WORK_NODE:
3299 node = container_of(w, struct binder_node, work);
3300 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3301 prefix, node->debug_id,
3302 (u64)node->ptr, (u64)node->cookie);
3303 break;
3304 case BINDER_WORK_DEAD_BINDER:
3305 seq_printf(m, "%shas dead binder\n", prefix);
3306 break;
3307 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3308 seq_printf(m, "%shas cleared dead binder\n", prefix);
3309 break;
3310 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3311 seq_printf(m, "%shas cleared death notification\n", prefix);
3312 break;
3313 default:
3314 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3315 break;
3316 }
3317 }
3318
3319 static void print_binder_thread(struct seq_file *m,
3320 struct binder_thread *thread,
3321 int print_always)
3322 {
3323 struct binder_transaction *t;
3324 struct binder_work *w;
3325 size_t start_pos = m->count;
3326 size_t header_pos;
3327
3328 seq_printf(m, " thread %d: l %02x\n", thread->pid, thread->looper);
3329 header_pos = m->count;
3330 t = thread->transaction_stack;
3331 while (t) {
3332 if (t->from == thread) {
3333 print_binder_transaction(m,
3334 " outgoing transaction", t);
3335 t = t->from_parent;
3336 } else if (t->to_thread == thread) {
3337 print_binder_transaction(m,
3338 " incoming transaction", t);
3339 t = t->to_parent;
3340 } else {
3341 print_binder_transaction(m, " bad transaction", t);
3342 t = NULL;
3343 }
3344 }
3345 list_for_each_entry(w, &thread->todo, entry) {
3346 print_binder_work(m, " ", " pending transaction", w);
3347 }
3348 if (!print_always && m->count == header_pos)
3349 m->count = start_pos;
3350 }
3351
3352 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3353 {
3354 struct binder_ref *ref;
3355 struct binder_work *w;
3356 int count;
3357
3358 count = 0;
3359 hlist_for_each_entry(ref, &node->refs, node_entry)
3360 count++;
3361
3362 seq_printf(m, " node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3363 node->debug_id, (u64)node->ptr, (u64)node->cookie,
3364 node->has_strong_ref, node->has_weak_ref,
3365 node->local_strong_refs, node->local_weak_refs,
3366 node->internal_strong_refs, count);
3367 if (count) {
3368 seq_puts(m, " proc");
3369 hlist_for_each_entry(ref, &node->refs, node_entry)
3370 seq_printf(m, " %d", ref->proc->pid);
3371 }
3372 seq_puts(m, "\n");
3373 list_for_each_entry(w, &node->async_todo, entry)
3374 print_binder_work(m, " ",
3375 " pending async transaction", w);
3376 }
3377
3378 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3379 {
3380 seq_printf(m, " ref %d: desc %d %snode %d s %d w %d d %p\n",
3381 ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3382 ref->node->debug_id, ref->strong, ref->weak, ref->death);
3383 }
3384
3385 static void print_binder_proc(struct seq_file *m,
3386 struct binder_proc *proc, int print_all)
3387 {
3388 struct binder_work *w;
3389 struct rb_node *n;
3390 size_t start_pos = m->count;
3391 size_t header_pos;
3392
3393 seq_printf(m, "proc %d\n", proc->pid);
3394 header_pos = m->count;
3395
3396 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3397 print_binder_thread(m, rb_entry(n, struct binder_thread,
3398 rb_node), print_all);
3399 for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3400 struct binder_node *node = rb_entry(n, struct binder_node,
3401 rb_node);
3402 if (print_all || node->has_async_transaction)
3403 print_binder_node(m, node);
3404 }
3405 if (print_all) {
3406 for (n = rb_first(&proc->refs_by_desc);
3407 n != NULL;
3408 n = rb_next(n))
3409 print_binder_ref(m, rb_entry(n, struct binder_ref,
3410 rb_node_desc));
3411 }
3412 for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3413 print_binder_buffer(m, " buffer",
3414 rb_entry(n, struct binder_buffer, rb_node));
3415 list_for_each_entry(w, &proc->todo, entry)
3416 print_binder_work(m, " ", " pending transaction", w);
3417 list_for_each_entry(w, &proc->delivered_death, entry) {
3418 seq_puts(m, " has delivered dead binder\n");
3419 break;
3420 }
3421 if (!print_all && m->count == header_pos)
3422 m->count = start_pos;
3423 }
3424
3425 static const char * const binder_return_strings[] = {
3426 "BR_ERROR",
3427 "BR_OK",
3428 "BR_TRANSACTION",
3429 "BR_REPLY",
3430 "BR_ACQUIRE_RESULT",
3431 "BR_DEAD_REPLY",
3432 "BR_TRANSACTION_COMPLETE",
3433 "BR_INCREFS",
3434 "BR_ACQUIRE",
3435 "BR_RELEASE",
3436 "BR_DECREFS",
3437 "BR_ATTEMPT_ACQUIRE",
3438 "BR_NOOP",
3439 "BR_SPAWN_LOOPER",
3440 "BR_FINISHED",
3441 "BR_DEAD_BINDER",
3442 "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3443 "BR_FAILED_REPLY"
3444 };
3445
3446 static const char * const binder_command_strings[] = {
3447 "BC_TRANSACTION",
3448 "BC_REPLY",
3449 "BC_ACQUIRE_RESULT",
3450 "BC_FREE_BUFFER",
3451 "BC_INCREFS",
3452 "BC_ACQUIRE",
3453 "BC_RELEASE",
3454 "BC_DECREFS",
3455 "BC_INCREFS_DONE",
3456 "BC_ACQUIRE_DONE",
3457 "BC_ATTEMPT_ACQUIRE",
3458 "BC_REGISTER_LOOPER",
3459 "BC_ENTER_LOOPER",
3460 "BC_EXIT_LOOPER",
3461 "BC_REQUEST_DEATH_NOTIFICATION",
3462 "BC_CLEAR_DEATH_NOTIFICATION",
3463 "BC_DEAD_BINDER_DONE"
3464 };
3465
3466 static const char * const binder_objstat_strings[] = {
3467 "proc",
3468 "thread",
3469 "node",
3470 "ref",
3471 "death",
3472 "transaction",
3473 "transaction_complete"
3474 };
3475
3476 static void print_binder_stats(struct seq_file *m, const char *prefix,
3477 struct binder_stats *stats)
3478 {
3479 int i;
3480
3481 BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3482 ARRAY_SIZE(binder_command_strings));
3483 for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3484 if (stats->bc[i])
3485 seq_printf(m, "%s%s: %d\n", prefix,
3486 binder_command_strings[i], stats->bc[i]);
3487 }
3488
3489 BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3490 ARRAY_SIZE(binder_return_strings));
3491 for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3492 if (stats->br[i])
3493 seq_printf(m, "%s%s: %d\n", prefix,
3494 binder_return_strings[i], stats->br[i]);
3495 }
3496
3497 BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3498 ARRAY_SIZE(binder_objstat_strings));
3499 BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
3500 ARRAY_SIZE(stats->obj_deleted));
3501 for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
3502 if (stats->obj_created[i] || stats->obj_deleted[i])
3503 seq_printf(m, "%s%s: active %d total %d\n", prefix,
3504 binder_objstat_strings[i],
3505 stats->obj_created[i] - stats->obj_deleted[i],
3506 stats->obj_created[i]);
3507 }
3508 }
3509
3510 static void print_binder_proc_stats(struct seq_file *m,
3511 struct binder_proc *proc)
3512 {
3513 struct binder_work *w;
3514 struct rb_node *n;
3515 int count, strong, weak;
3516
3517 seq_printf(m, "proc %d\n", proc->pid);
3518 count = 0;
3519 for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3520 count++;
3521 seq_printf(m, " threads: %d\n", count);
3522 seq_printf(m, " requested threads: %d+%d/%d\n"
3523 " ready threads %d\n"
3524 " free async space %zd\n", proc->requested_threads,
3525 proc->requested_threads_started, proc->max_threads,
3526 proc->ready_threads, proc->free_async_space);
3527 count = 0;
3528 for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
3529 count++;
3530 seq_printf(m, " nodes: %d\n", count);
3531 count = 0;
3532 strong = 0;
3533 weak = 0;
3534 for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
3535 struct binder_ref *ref = rb_entry(n, struct binder_ref,
3536 rb_node_desc);
3537 count++;
3538 strong += ref->strong;
3539 weak += ref->weak;
3540 }
3541 seq_printf(m, " refs: %d s %d w %d\n", count, strong, weak);
3542
3543 count = 0;
3544 for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3545 count++;
3546 seq_printf(m, " buffers: %d\n", count);
3547
3548 count = 0;
3549 list_for_each_entry(w, &proc->todo, entry) {
3550 switch (w->type) {
3551 case BINDER_WORK_TRANSACTION:
3552 count++;
3553 break;
3554 default:
3555 break;
3556 }
3557 }
3558 seq_printf(m, " pending transactions: %d\n", count);
3559
3560 print_binder_stats(m, " ", &proc->stats);
3561 }
3562
3563
3564 static int binder_state_show(struct seq_file *m, void *unused)
3565 {
3566 struct binder_proc *proc;
3567 struct binder_node *node;
3568 int do_lock = !binder_debug_no_lock;
3569
3570 if (do_lock)
3571 binder_lock(__func__);
3572
3573 seq_puts(m, "binder state:\n");
3574
3575 if (!hlist_empty(&binder_dead_nodes))
3576 seq_puts(m, "dead nodes:\n");
3577 hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
3578 print_binder_node(m, node);
3579
3580 hlist_for_each_entry(proc, &binder_procs, proc_node)
3581 print_binder_proc(m, proc, 1);
3582 if (do_lock)
3583 binder_unlock(__func__);
3584 return 0;
3585 }
3586
3587 static int binder_stats_show(struct seq_file *m, void *unused)
3588 {
3589 struct binder_proc *proc;
3590 int do_lock = !binder_debug_no_lock;
3591
3592 if (do_lock)
3593 binder_lock(__func__);
3594
3595 seq_puts(m, "binder stats:\n");
3596
3597 print_binder_stats(m, "", &binder_stats);
3598
3599 hlist_for_each_entry(proc, &binder_procs, proc_node)
3600 print_binder_proc_stats(m, proc);
3601 if (do_lock)
3602 binder_unlock(__func__);
3603 return 0;
3604 }
3605
3606 static int binder_transactions_show(struct seq_file *m, void *unused)
3607 {
3608 struct binder_proc *proc;
3609 int do_lock = !binder_debug_no_lock;
3610
3611 if (do_lock)
3612 binder_lock(__func__);
3613
3614 seq_puts(m, "binder transactions:\n");
3615 hlist_for_each_entry(proc, &binder_procs, proc_node)
3616 print_binder_proc(m, proc, 0);
3617 if (do_lock)
3618 binder_unlock(__func__);
3619 return 0;
3620 }
3621
3622 static int binder_proc_show(struct seq_file *m, void *unused)
3623 {
3624 struct binder_proc *itr;
3625 struct binder_proc *proc = m->private;
3626 int do_lock = !binder_debug_no_lock;
3627 bool valid_proc = false;
3628
3629 if (do_lock)
3630 binder_lock(__func__);
3631
3632 hlist_for_each_entry(itr, &binder_procs, proc_node) {
3633 if (itr == proc) {
3634 valid_proc = true;
3635 break;
3636 }
3637 }
3638 if (valid_proc) {
3639 seq_puts(m, "binder proc state:\n");
3640 print_binder_proc(m, proc, 1);
3641 }
3642 if (do_lock)
3643 binder_unlock(__func__);
3644 return 0;
3645 }
3646
3647 static void print_binder_transaction_log_entry(struct seq_file *m,
3648 struct binder_transaction_log_entry *e)
3649 {
3650 seq_printf(m,
3651 "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d\n",
3652 e->debug_id, (e->call_type == 2) ? "reply" :
3653 ((e->call_type == 1) ? "async" : "call "), e->from_proc,
3654 e->from_thread, e->to_proc, e->to_thread, e->to_node,
3655 e->target_handle, e->data_size, e->offsets_size);
3656 }
3657
3658 static int binder_transaction_log_show(struct seq_file *m, void *unused)
3659 {
3660 struct binder_transaction_log *log = m->private;
3661 int i;
3662
3663 if (log->full) {
3664 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
3665 print_binder_transaction_log_entry(m, &log->entry[i]);
3666 }
3667 for (i = 0; i < log->next; i++)
3668 print_binder_transaction_log_entry(m, &log->entry[i]);
3669 return 0;
3670 }
3671
3672 static const struct file_operations binder_fops = {
3673 .owner = THIS_MODULE,
3674 .poll = binder_poll,
3675 .unlocked_ioctl = binder_ioctl,
3676 .compat_ioctl = binder_ioctl,
3677 .mmap = binder_mmap,
3678 .open = binder_open,
3679 .flush = binder_flush,
3680 .release = binder_release,
3681 };
3682
3683 static struct miscdevice binder_miscdev = {
3684 .minor = MISC_DYNAMIC_MINOR,
3685 .name = "binder",
3686 .fops = &binder_fops
3687 };
3688
3689 BINDER_DEBUG_ENTRY(state);
3690 BINDER_DEBUG_ENTRY(stats);
3691 BINDER_DEBUG_ENTRY(transactions);
3692 BINDER_DEBUG_ENTRY(transaction_log);
3693
3694 static int __init binder_init(void)
3695 {
3696 int ret;
3697
3698 binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
3699 if (binder_debugfs_dir_entry_root)
3700 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
3701 binder_debugfs_dir_entry_root);
3702 ret = misc_register(&binder_miscdev);
3703 if (binder_debugfs_dir_entry_root) {
3704 debugfs_create_file("state",
3705 S_IRUGO,
3706 binder_debugfs_dir_entry_root,
3707 NULL,
3708 &binder_state_fops);
3709 debugfs_create_file("stats",
3710 S_IRUGO,
3711 binder_debugfs_dir_entry_root,
3712 NULL,
3713 &binder_stats_fops);
3714 debugfs_create_file("transactions",
3715 S_IRUGO,
3716 binder_debugfs_dir_entry_root,
3717 NULL,
3718 &binder_transactions_fops);
3719 debugfs_create_file("transaction_log",
3720 S_IRUGO,
3721 binder_debugfs_dir_entry_root,
3722 &binder_transaction_log,
3723 &binder_transaction_log_fops);
3724 debugfs_create_file("failed_transaction_log",
3725 S_IRUGO,
3726 binder_debugfs_dir_entry_root,
3727 &binder_transaction_log_failed,
3728 &binder_transaction_log_fops);
3729 }
3730 return ret;
3731 }
3732
3733 device_initcall(binder_init);
3734
3735 #define CREATE_TRACE_POINTS
3736 #include "binder_trace.h"
3737
3738 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support