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anbox-modules/binder/binder.c

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/* binder.c
*
* Android IPC Subsystem
*
* Copyright (C) 2007-2008 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <asm/cacheflush.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/fdtable.h>
#include <linux/file.h>
#include <linux/freezer.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/nsproxy.h>
#include <linux/poll.h>
#include <linux/debugfs.h>
#include <linux/rbtree.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
#include <linux/sched/signal.h>
#include <linux/sched/mm.h>
#else
#include <linux/signal.h>
#include <linux/mm.h>
#endif
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/pid_namespace.h>
#include <linux/security.h>
#ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
#define BINDER_IPC_32BIT 1
#endif
/* Until I upstream a better version of this patch choose an arbitrary major
* number in the high end spectrum that has not yet been given away and is
* unlikely to be given away in the near future.
*/
#define BINDER_DKMS_MAJOR 511
#define BINDER_DKMS_MAX_MINOR 1024
#include "binder.h"
#include "binder_trace.h"
#ifndef MAX_NICE
#define MAX_NICE 19
#endif
static DEFINE_MUTEX(binder_main_lock);
static DEFINE_MUTEX(binder_deferred_lock);
static DEFINE_MUTEX(binder_mmap_lock);
static DEFINE_MUTEX(binder_devices_mtx);
static HLIST_HEAD(binder_devices);
static HLIST_HEAD(binder_procs);
static HLIST_HEAD(binder_deferred_list);
static HLIST_HEAD(binder_dead_nodes);
static struct dentry *binder_debugfs_dir_entry_root;
static struct dentry *binder_debugfs_dir_entry_proc;
static int binder_last_id;
#define BINDER_DEBUG_ENTRY(name) \
static int binder_##name##_open(struct inode *inode, struct file *file) \
{ \
return single_open(file, binder_##name##_show, inode->i_private); \
} \
\
static const struct file_operations binder_##name##_fops = { \
.owner = THIS_MODULE, \
.open = binder_##name##_open, \
.read = seq_read, \
.llseek = seq_lseek, \
.release = single_release, \
}
static int binder_proc_show(struct seq_file *m, void *unused);
BINDER_DEBUG_ENTRY(proc);
/* This is only defined in include/asm-arm/sizes.h */
#ifndef SZ_1K
#define SZ_1K 0x400
#endif
#ifndef SZ_4M
#define SZ_4M 0x400000
#endif
#define FORBIDDEN_MMAP_FLAGS (VM_WRITE)
#define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
enum {
BINDER_DEBUG_USER_ERROR = 1U << 0,
BINDER_DEBUG_FAILED_TRANSACTION = 1U << 1,
BINDER_DEBUG_DEAD_TRANSACTION = 1U << 2,
BINDER_DEBUG_OPEN_CLOSE = 1U << 3,
BINDER_DEBUG_DEAD_BINDER = 1U << 4,
BINDER_DEBUG_DEATH_NOTIFICATION = 1U << 5,
BINDER_DEBUG_READ_WRITE = 1U << 6,
BINDER_DEBUG_USER_REFS = 1U << 7,
BINDER_DEBUG_THREADS = 1U << 8,
BINDER_DEBUG_TRANSACTION = 1U << 9,
BINDER_DEBUG_TRANSACTION_COMPLETE = 1U << 10,
BINDER_DEBUG_FREE_BUFFER = 1U << 11,
BINDER_DEBUG_INTERNAL_REFS = 1U << 12,
BINDER_DEBUG_BUFFER_ALLOC = 1U << 13,
BINDER_DEBUG_PRIORITY_CAP = 1U << 14,
BINDER_DEBUG_BUFFER_ALLOC_ASYNC = 1U << 15,
};
static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
static bool binder_debug_no_lock;
module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
static int binder_devices_param = 1;
module_param_named(num_devices, binder_devices_param, int, 0444);
static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
static int binder_stop_on_user_error;
static int binder_set_stop_on_user_error(const char *val,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
const struct kernel_param *kp)
#else
struct kernel_param *kp)
#endif
{
int ret;
ret = param_set_int(val, kp);
if (binder_stop_on_user_error < 2)
wake_up(&binder_user_error_wait);
return ret;
}
module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
#define binder_debug(mask, x...) \
do { \
if (binder_debug_mask & mask) \
pr_info(x); \
} while (0)
#define binder_user_error(x...) \
do { \
if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
pr_info(x); \
if (binder_stop_on_user_error) \
binder_stop_on_user_error = 2; \
} while (0)
#define to_flat_binder_object(hdr) \
container_of(hdr, struct flat_binder_object, hdr)
#define to_binder_fd_object(hdr) container_of(hdr, struct binder_fd_object, hdr)
#define to_binder_buffer_object(hdr) \
container_of(hdr, struct binder_buffer_object, hdr)
#define to_binder_fd_array_object(hdr) \
container_of(hdr, struct binder_fd_array_object, hdr)
enum binder_stat_types {
BINDER_STAT_PROC,
BINDER_STAT_THREAD,
BINDER_STAT_NODE,
BINDER_STAT_REF,
BINDER_STAT_DEATH,
BINDER_STAT_TRANSACTION,
BINDER_STAT_TRANSACTION_COMPLETE,
BINDER_STAT_COUNT
};
struct binder_stats {
int br[_IOC_NR(BR_FAILED_REPLY) + 1];
int bc[_IOC_NR(BC_REPLY_SG) + 1];
int obj_created[BINDER_STAT_COUNT];
int obj_deleted[BINDER_STAT_COUNT];
};
static struct binder_stats binder_stats;
static inline void binder_stats_deleted(enum binder_stat_types type)
{
binder_stats.obj_deleted[type]++;
}
static inline void binder_stats_created(enum binder_stat_types type)
{
binder_stats.obj_created[type]++;
}
struct binder_transaction_log_entry {
int debug_id;
int call_type;
int from_proc;
int from_thread;
int target_handle;
int to_proc;
int to_thread;
int to_node;
int data_size;
int offsets_size;
const char *context_name;
};
struct binder_transaction_log {
int next;
int full;
struct binder_transaction_log_entry entry[32];
};
static struct binder_transaction_log binder_transaction_log;
static struct binder_transaction_log binder_transaction_log_failed;
static struct binder_transaction_log_entry *binder_transaction_log_add(
struct binder_transaction_log *log)
{
struct binder_transaction_log_entry *e;
e = &log->entry[log->next];
memset(e, 0, sizeof(*e));
log->next++;
if (log->next == ARRAY_SIZE(log->entry)) {
log->next = 0;
log->full = 1;
}
return e;
}
struct binder_context {
struct binder_node *binder_context_mgr_node;
kuid_t binder_context_mgr_uid;
const char *name;
};
struct binder_device {
struct hlist_node hlist;
struct cdev cdev;
struct device class_dev;
struct binder_context context;
};
struct binder_work {
struct list_head entry;
enum {
BINDER_WORK_TRANSACTION = 1,
BINDER_WORK_TRANSACTION_COMPLETE,
BINDER_WORK_NODE,
BINDER_WORK_DEAD_BINDER,
BINDER_WORK_DEAD_BINDER_AND_CLEAR,
BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
} type;
};
struct binder_node {
int debug_id;
struct binder_work work;
union {
struct rb_node rb_node;
struct hlist_node dead_node;
};
struct binder_proc *proc;
struct hlist_head refs;
int internal_strong_refs;
int local_weak_refs;
int local_strong_refs;
binder_uintptr_t ptr;
binder_uintptr_t cookie;
unsigned has_strong_ref:1;
unsigned pending_strong_ref:1;
unsigned has_weak_ref:1;
unsigned pending_weak_ref:1;
unsigned has_async_transaction:1;
unsigned accept_fds:1;
unsigned min_priority:8;
struct list_head async_todo;
};
struct binder_ref_death {
struct binder_work work;
binder_uintptr_t cookie;
};
struct binder_ref {
/* Lookups needed: */
/* node + proc => ref (transaction) */
/* desc + proc => ref (transaction, inc/dec ref) */
/* node => refs + procs (proc exit) */
int debug_id;
struct rb_node rb_node_desc;
struct rb_node rb_node_node;
struct hlist_node node_entry;
struct binder_proc *proc;
struct binder_node *node;
uint32_t desc;
int strong;
int weak;
struct binder_ref_death *death;
};
struct binder_buffer {
struct list_head entry; /* free and allocated entries by address */
struct rb_node rb_node; /* free entry by size or allocated entry */
/* by address */
unsigned free:1;
unsigned allow_user_free:1;
unsigned async_transaction:1;
unsigned debug_id:29;
struct binder_transaction *transaction;
struct binder_node *target_node;
size_t data_size;
size_t offsets_size;
size_t extra_buffers_size;
uint8_t data[0];
};
enum binder_deferred_state {
BINDER_DEFERRED_PUT_FILES = 0x01,
BINDER_DEFERRED_FLUSH = 0x02,
BINDER_DEFERRED_RELEASE = 0x04,
};
struct binder_proc {
struct hlist_node proc_node;
struct rb_root threads;
struct rb_root nodes;
struct rb_root refs_by_desc;
struct rb_root refs_by_node;
int pid;
struct vm_area_struct *vma;
struct mm_struct *vma_vm_mm;
struct task_struct *tsk;
struct files_struct *files;
struct hlist_node deferred_work_node;
int deferred_work;
void *buffer;
ptrdiff_t user_buffer_offset;
struct list_head buffers;
struct rb_root free_buffers;
struct rb_root allocated_buffers;
size_t free_async_space;
struct page **pages;
size_t buffer_size;
uint32_t buffer_free;
struct list_head todo;
wait_queue_head_t wait;
struct binder_stats stats;
struct list_head delivered_death;
int max_threads;
int requested_threads;
int requested_threads_started;
int ready_threads;
long default_priority;
struct dentry *debugfs_entry;
struct binder_context *context;
};
enum {
BINDER_LOOPER_STATE_REGISTERED = 0x01,
BINDER_LOOPER_STATE_ENTERED = 0x02,
BINDER_LOOPER_STATE_EXITED = 0x04,
BINDER_LOOPER_STATE_INVALID = 0x08,
BINDER_LOOPER_STATE_WAITING = 0x10,
BINDER_LOOPER_STATE_NEED_RETURN = 0x20
};
struct binder_thread {
struct binder_proc *proc;
struct rb_node rb_node;
int pid;
int looper;
struct binder_transaction *transaction_stack;
struct list_head todo;
uint32_t return_error; /* Write failed, return error code in read buf */
uint32_t return_error2; /* Write failed, return error code in read */
/* buffer. Used when sending a reply to a dead process that */
/* we are also waiting on */
wait_queue_head_t wait;
struct binder_stats stats;
};
struct binder_transaction {
int debug_id;
struct binder_work work;
struct binder_thread *from;
struct binder_transaction *from_parent;
struct binder_proc *to_proc;
struct binder_thread *to_thread;
struct binder_transaction *to_parent;
unsigned need_reply:1;
/* unsigned is_dead:1; */ /* not used at the moment */
struct binder_buffer *buffer;
unsigned int code;
unsigned int flags;
long priority;
long saved_priority;
kuid_t sender_euid;
};
static void
binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
{
struct files_struct *files = proc->files;
unsigned long rlim_cur;
unsigned long irqs;
if (files == NULL)
return -ESRCH;
if (!lock_task_sighand(proc->tsk, &irqs))
return -EMFILE;
rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
unlock_task_sighand(proc->tsk, &irqs);
return __alloc_fd(files, 0, rlim_cur, flags);
}
/*
* copied from fd_install
*/
static void task_fd_install(
struct binder_proc *proc, unsigned int fd, struct file *file)
{
if (proc->files)
__fd_install(proc->files, fd, file);
}
/*
* copied from sys_close
*/
static long task_close_fd(struct binder_proc *proc, unsigned int fd)
{
int retval;
if (proc->files == NULL)
return -ESRCH;
retval = __close_fd(proc->files, fd);
/* can't restart close syscall because file table entry was cleared */
if (unlikely(retval == -ERESTARTSYS ||
retval == -ERESTARTNOINTR ||
retval == -ERESTARTNOHAND ||
retval == -ERESTART_RESTARTBLOCK))
retval = -EINTR;
return retval;
}
static inline void binder_lock(const char *tag)
{
trace_binder_lock(tag);
mutex_lock(&binder_main_lock);
trace_binder_locked(tag);
}
static inline void binder_unlock(const char *tag)
{
trace_binder_unlock(tag);
mutex_unlock(&binder_main_lock);
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0)
/*
* Convert rlimit style value [1,40] to nice value [-20, 19].
*/
static inline long rlimit_to_nice(long prio)
{
return (MAX_NICE - prio + 1);
}
#endif
static void binder_set_nice(long nice)
{
long min_nice;
if (can_nice(current, nice)) {
set_user_nice(current, nice);
return;
}
min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
binder_debug(BINDER_DEBUG_PRIORITY_CAP,
"%d: nice value %ld not allowed use %ld instead\n",
current->pid, nice, min_nice);
set_user_nice(current, min_nice);
if (min_nice <= MAX_NICE)
return;
}
static size_t binder_buffer_size(struct binder_proc *proc,
struct binder_buffer *buffer)
{
if (list_is_last(&buffer->entry, &proc->buffers))
return proc->buffer + proc->buffer_size - (void *)buffer->data;
return (size_t)list_entry(buffer->entry.next,
struct binder_buffer, entry) - (size_t)buffer->data;
}
static void binder_insert_free_buffer(struct binder_proc *proc,
struct binder_buffer *new_buffer)
{
struct rb_node **p = &proc->free_buffers.rb_node;
struct rb_node *parent = NULL;
struct binder_buffer *buffer;
size_t buffer_size;
size_t new_buffer_size;
BUG_ON(!new_buffer->free);
new_buffer_size = binder_buffer_size(proc, new_buffer);
binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: add free buffer, size %zd, at %p\n",
proc->pid, new_buffer_size, new_buffer);
while (*p) {
parent = *p;
buffer = rb_entry(parent, struct binder_buffer, rb_node);
BUG_ON(!buffer->free);
buffer_size = binder_buffer_size(proc, buffer);
if (new_buffer_size < buffer_size)
p = &parent->rb_left;
else
p = &parent->rb_right;
}
rb_link_node(&new_buffer->rb_node, parent, p);
rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
}
static void binder_insert_allocated_buffer(struct binder_proc *proc,
struct binder_buffer *new_buffer)
{
struct rb_node **p = &proc->allocated_buffers.rb_node;
struct rb_node *parent = NULL;
struct binder_buffer *buffer;
BUG_ON(new_buffer->free);
while (*p) {
parent = *p;
buffer = rb_entry(parent, struct binder_buffer, rb_node);
BUG_ON(buffer->free);
if (new_buffer < buffer)
p = &parent->rb_left;
else if (new_buffer > buffer)
p = &parent->rb_right;
else
BUG();
}
rb_link_node(&new_buffer->rb_node, parent, p);
rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
}
static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
uintptr_t user_ptr)
{
struct rb_node *n = proc->allocated_buffers.rb_node;
struct binder_buffer *buffer;
struct binder_buffer *kern_ptr;
kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
- offsetof(struct binder_buffer, data));
while (n) {
buffer = rb_entry(n, struct binder_buffer, rb_node);
BUG_ON(buffer->free);
if (kern_ptr < buffer)
n = n->rb_left;
else if (kern_ptr > buffer)
n = n->rb_right;
else
return buffer;
}
return NULL;
}
static int binder_update_page_range(struct binder_proc *proc, int allocate,
void *start, void *end,
struct vm_area_struct *vma)
{
void *page_addr;
unsigned long user_page_addr;
struct page **page;
struct mm_struct *mm;
binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: %s pages %p-%p\n", proc->pid,
allocate ? "allocate" : "free", start, end);
if (end <= start)
return 0;
trace_binder_update_page_range(proc, allocate, start, end);
if (vma)
mm = NULL;
else
mm = get_task_mm(proc->tsk);
if (mm) {
down_write(&mm->mmap_sem);
vma = proc->vma;
if (vma && mm != proc->vma_vm_mm) {
pr_err("%d: vma mm and task mm mismatch\n",
proc->pid);
vma = NULL;
}
}
if (allocate == 0)
goto free_range;
if (vma == NULL) {
pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
proc->pid);
goto err_no_vma;
}
for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
int ret;
page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
BUG_ON(*page);
*page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
if (*page == NULL) {
pr_err("%d: binder_alloc_buf failed for page at %p\n",
proc->pid, page_addr);
goto err_alloc_page_failed;
}
ret = map_kernel_range_noflush((unsigned long)page_addr,
PAGE_SIZE, PAGE_KERNEL, page);
flush_cache_vmap((unsigned long)page_addr,
(unsigned long)page_addr + PAGE_SIZE);
if (ret != 1) {
pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
proc->pid, page_addr);
goto err_map_kernel_failed;
}
user_page_addr =
(uintptr_t)page_addr + proc->user_buffer_offset;
ret = vm_insert_page(vma, user_page_addr, page[0]);
if (ret) {
pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
proc->pid, user_page_addr);
goto err_vm_insert_page_failed;
}
/* vm_insert_page does not seem to increment the refcount */
}
if (mm) {
up_write(&mm->mmap_sem);
mmput(mm);
}
return 0;
free_range:
for (page_addr = end - PAGE_SIZE; page_addr >= start;
page_addr -= PAGE_SIZE) {
page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
if (vma)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
zap_page_range(vma, (uintptr_t)page_addr +
proc->user_buffer_offset, PAGE_SIZE);
#else
zap_page_range(vma, (uintptr_t)page_addr +
proc->user_buffer_offset, PAGE_SIZE, NULL);
#endif
err_vm_insert_page_failed:
unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
err_map_kernel_failed:
__free_page(*page);
*page = NULL;
err_alloc_page_failed:
;
}
err_no_vma:
if (mm) {
up_write(&mm->mmap_sem);
mmput(mm);
}
return -ENOMEM;
}
static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
size_t data_size,
size_t offsets_size,
size_t extra_buffers_size,
int is_async)
{
struct rb_node *n = proc->free_buffers.rb_node;
struct binder_buffer *buffer;
size_t buffer_size;
struct rb_node *best_fit = NULL;
void *has_page_addr;
void *end_page_addr;
size_t size, data_offsets_size;
if (proc->vma == NULL) {
pr_err("%d: binder_alloc_buf, no vma\n",
proc->pid);
return NULL;
}
data_offsets_size = ALIGN(data_size, sizeof(void *)) +
ALIGN(offsets_size, sizeof(void *));
if (data_offsets_size < data_size || data_offsets_size < offsets_size) {
binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
proc->pid, data_size, offsets_size);
return NULL;
}
size = data_offsets_size + ALIGN(extra_buffers_size, sizeof(void *));
if (size < data_offsets_size || size < extra_buffers_size) {
binder_user_error("%d: got transaction with invalid extra_buffers_size %zd\n",
proc->pid, extra_buffers_size);
return NULL;
}
if (is_async &&
proc->free_async_space < size + sizeof(struct binder_buffer)) {
binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: binder_alloc_buf size %zd failed, no async space left\n",
proc->pid, size);
return NULL;
}
while (n) {
buffer = rb_entry(n, struct binder_buffer, rb_node);
BUG_ON(!buffer->free);
buffer_size = binder_buffer_size(proc, buffer);
if (size < buffer_size) {
best_fit = n;
n = n->rb_left;
} else if (size > buffer_size)
n = n->rb_right;
else {
best_fit = n;
break;
}
}
if (best_fit == NULL) {
pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
proc->pid, size);
return NULL;
}
if (n == NULL) {
buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
buffer_size = binder_buffer_size(proc, buffer);
}
binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
proc->pid, size, buffer, buffer_size);
has_page_addr =
(void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
if (n == NULL) {
if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
buffer_size = size; /* no room for other buffers */
else
buffer_size = size + sizeof(struct binder_buffer);
}
end_page_addr =
(void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
if (end_page_addr > has_page_addr)
end_page_addr = has_page_addr;
if (binder_update_page_range(proc, 1,
(void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
return NULL;
rb_erase(best_fit, &proc->free_buffers);
buffer->free = 0;
binder_insert_allocated_buffer(proc, buffer);
if (buffer_size != size) {
struct binder_buffer *new_buffer = (void *)buffer->data + size;
list_add(&new_buffer->entry, &buffer->entry);
new_buffer->free = 1;
binder_insert_free_buffer(proc, new_buffer);
}
binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: binder_alloc_buf size %zd got %p\n",
proc->pid, size, buffer);
buffer->data_size = data_size;
buffer->offsets_size = offsets_size;
buffer->extra_buffers_size = extra_buffers_size;
buffer->async_transaction = is_async;
if (is_async) {
proc->free_async_space -= size + sizeof(struct binder_buffer);
binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
"%d: binder_alloc_buf size %zd async free %zd\n",
proc->pid, size, proc->free_async_space);
}
return buffer;
}
static void *buffer_start_page(struct binder_buffer *buffer)
{
return (void *)((uintptr_t)buffer & PAGE_MASK);
}
static void *buffer_end_page(struct binder_buffer *buffer)
{
return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
}
static void binder_delete_free_buffer(struct binder_proc *proc,
struct binder_buffer *buffer)
{
struct binder_buffer *prev, *next = NULL;
int free_page_end = 1;
int free_page_start = 1;
BUG_ON(proc->buffers.next == &buffer->entry);
prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
BUG_ON(!prev->free);
if (buffer_end_page(prev) == buffer_start_page(buffer)) {
free_page_start = 0;
if (buffer_end_page(prev) == buffer_end_page(buffer))
free_page_end = 0;
binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: merge free, buffer %p share page with %p\n",
proc->pid, buffer, prev);
}
if (!list_is_last(&buffer->entry, &proc->buffers)) {
next = list_entry(buffer->entry.next,
struct binder_buffer, entry);
if (buffer_start_page(next) == buffer_end_page(buffer)) {
free_page_end = 0;
if (buffer_start_page(next) ==
buffer_start_page(buffer))
free_page_start = 0;
binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: merge free, buffer %p share page with %p\n",
proc->pid, buffer, prev);
}
}
list_del(&buffer->entry);
if (free_page_start || free_page_end) {
binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
proc->pid, buffer, free_page_start ? "" : " end",
free_page_end ? "" : " start", prev, next);
binder_update_page_range(proc, 0, free_page_start ?
buffer_start_page(buffer) : buffer_end_page(buffer),
(free_page_end ? buffer_end_page(buffer) :
buffer_start_page(buffer)) + PAGE_SIZE, NULL);
}
}
static void binder_free_buf(struct binder_proc *proc,
struct binder_buffer *buffer)
{
size_t size, buffer_size;
buffer_size = binder_buffer_size(proc, buffer);
size = ALIGN(buffer->data_size, sizeof(void *)) +
ALIGN(buffer->offsets_size, sizeof(void *)) +
ALIGN(buffer->extra_buffers_size, sizeof(void *));
binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: binder_free_buf %p size %zd buffer_size %zd\n",
proc->pid, buffer, size, buffer_size);
BUG_ON(buffer->free);
BUG_ON(size > buffer_size);
BUG_ON(buffer->transaction != NULL);
BUG_ON((void *)buffer < proc->buffer);
BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
if (buffer->async_transaction) {
proc->free_async_space += size + sizeof(struct binder_buffer);
binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
"%d: binder_free_buf size %zd async free %zd\n",
proc->pid, size, proc->free_async_space);
}
binder_update_page_range(proc, 0,
(void *)PAGE_ALIGN((uintptr_t)buffer->data),
(void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
NULL);
rb_erase(&buffer->rb_node, &proc->allocated_buffers);
buffer->free = 1;
if (!list_is_last(&buffer->entry, &proc->buffers)) {
struct binder_buffer *next = list_entry(buffer->entry.next,
struct binder_buffer, entry);
if (next->free) {
rb_erase(&next->rb_node, &proc->free_buffers);
binder_delete_free_buffer(proc, next);
}
}
if (proc->buffers.next != &buffer->entry) {
struct binder_buffer *prev = list_entry(buffer->entry.prev,
struct binder_buffer, entry);
if (prev->free) {
binder_delete_free_buffer(proc, buffer);
rb_erase(&prev->rb_node, &proc->free_buffers);
buffer = prev;
}
}
binder_insert_free_buffer(proc, buffer);
}
static struct binder_node *binder_get_node(struct binder_proc *proc,
binder_uintptr_t ptr)
{
struct rb_node *n = proc->nodes.rb_node;
struct binder_node *node;
while (n) {
node = rb_entry(n, struct binder_node, rb_node);
if (ptr < node->ptr)
n = n->rb_left;
else if (ptr > node->ptr)
n = n->rb_right;
else
return node;
}
return NULL;
}
static struct binder_node *binder_new_node(struct binder_proc *proc,
binder_uintptr_t ptr,
binder_uintptr_t cookie)
{
struct rb_node **p = &proc->nodes.rb_node;
struct rb_node *parent = NULL;
struct binder_node *node;
while (*p) {
parent = *p;
node = rb_entry(parent, struct binder_node, rb_node);
if (ptr < node->ptr)
p = &(*p)->rb_left;
else if (ptr > node->ptr)
p = &(*p)->rb_right;
else
return NULL;
}
node = kzalloc(sizeof(*node), GFP_KERNEL);
if (node == NULL)
return NULL;
binder_stats_created(BINDER_STAT_NODE);
rb_link_node(&node->rb_node, parent, p);
rb_insert_color(&node->rb_node, &proc->nodes);
node->debug_id = ++binder_last_id;
node->proc = proc;
node->ptr = ptr;
node->cookie = cookie;
node->work.type = BINDER_WORK_NODE;
INIT_LIST_HEAD(&node->work.entry);
INIT_LIST_HEAD(&node->async_todo);
binder_debug(BINDER_DEBUG_INTERNAL_REFS,
"%d:%d node %d u%016llx c%016llx created\n",
proc->pid, current->pid, node->debug_id,
(u64)node->ptr, (u64)node->cookie);
return node;
}
static int binder_inc_node(struct binder_node *node, int strong, int internal,
struct list_head *target_list)
{
if (strong) {
if (internal) {
if (target_list == NULL &&
node->internal_strong_refs == 0 &&
!(node->proc &&
node == node->proc->context->binder_context_mgr_node &&
node->has_strong_ref)) {
pr_err("invalid inc strong node for %d\n",
node->debug_id);
return -EINVAL;
}
node->internal_strong_refs++;
} else
node->local_strong_refs++;
if (!node->has_strong_ref && target_list) {
list_del_init(&node->work.entry);
list_add_tail(&node->work.entry, target_list);
}
} else {
if (!internal)
node->local_weak_refs++;
if (!node->has_weak_ref && list_empty(&node->work.entry)) {
if (target_list == NULL) {
pr_err("invalid inc weak node for %d\n",
node->debug_id);
return -EINVAL;
}
list_add_tail(&node->work.entry, target_list);
}
}
return 0;
}
static int binder_dec_node(struct binder_node *node, int strong, int internal)
{
if (strong) {
if (internal)
node->internal_strong_refs--;
else
node->local_strong_refs--;
if (node->local_strong_refs || node->internal_strong_refs)
return 0;
} else {
if (!internal)
node->local_weak_refs--;
if (node->local_weak_refs || !hlist_empty(&node->refs))
return 0;
}
if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
if (list_empty(&node->work.entry)) {
list_add_tail(&node->work.entry, &node->proc->todo);
wake_up_interruptible(&node->proc->wait);
}
} else {
if (hlist_empty(&node->refs) && !node->local_strong_refs &&
!node->local_weak_refs) {
list_del_init(&node->work.entry);
if (node->proc) {
rb_erase(&node->rb_node, &node->proc->nodes);
binder_debug(BINDER_DEBUG_INTERNAL_REFS,
"refless node %d deleted\n",
node->debug_id);
} else {
hlist_del(&node->dead_node);
binder_debug(BINDER_DEBUG_INTERNAL_REFS,
"dead node %d deleted\n",
node->debug_id);
}
kfree(node);
binder_stats_deleted(BINDER_STAT_NODE);
}
}
return 0;
}
static struct binder_ref *binder_get_ref(struct binder_proc *proc,
u32 desc, bool need_strong_ref)
{
struct rb_node *n = proc->refs_by_desc.rb_node;
struct binder_ref *ref;
while (n) {
ref = rb_entry(n, struct binder_ref, rb_node_desc);
if (desc < ref->desc) {
n = n->rb_left;
} else if (desc > ref->desc) {
n = n->rb_right;
} else if (need_strong_ref && !ref->strong) {
binder_user_error("tried to use weak ref as strong ref\n");
return NULL;
} else {
return ref;
}
}
return NULL;
}
static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
struct binder_node *node)
{
struct rb_node *n;
struct rb_node **p = &proc->refs_by_node.rb_node;
struct rb_node *parent = NULL;
struct binder_ref *ref, *new_ref;
struct binder_context *context = proc->context;
while (*p) {
parent = *p;
ref = rb_entry(parent, struct binder_ref, rb_node_node);
if (node < ref->node)
p = &(*p)->rb_left;
else if (node > ref->node)
p = &(*p)->rb_right;
else
return ref;
}
new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
if (new_ref == NULL)
return NULL;
binder_stats_created(BINDER_STAT_REF);
new_ref->debug_id = ++binder_last_id;
new_ref->proc = proc;
new_ref->node = node;
rb_link_node(&new_ref->rb_node_node, parent, p);
rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
new_ref->desc = (node == context->binder_context_mgr_node) ? 0 : 1;
for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
ref = rb_entry(n, struct binder_ref, rb_node_desc);
if (ref->desc > new_ref->desc)
break;
new_ref->desc = ref->desc + 1;
}
p = &proc->refs_by_desc.rb_node;
while (*p) {
parent = *p;
ref = rb_entry(parent, struct binder_ref, rb_node_desc);
if (new_ref->desc < ref->desc)
p = &(*p)->rb_left;
else if (new_ref->desc > ref->desc)
p = &(*p)->rb_right;
else
BUG();
}
rb_link_node(&new_ref->rb_node_desc, parent, p);
rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
if (node) {
hlist_add_head(&new_ref->node_entry, &node->refs);
binder_debug(BINDER_DEBUG_INTERNAL_REFS,
"%d new ref %d desc %d for node %d\n",
proc->pid, new_ref->debug_id, new_ref->desc,
node->debug_id);
} else {
binder_debug(BINDER_DEBUG_INTERNAL_REFS,
"%d new ref %d desc %d for dead node\n",
proc->pid, new_ref->debug_id, new_ref->desc);
}
return new_ref;
}
static void binder_delete_ref(struct binder_ref *ref)
{
binder_debug(BINDER_DEBUG_INTERNAL_REFS,
"%d delete ref %d desc %d for node %d\n",
ref->proc->pid, ref->debug_id, ref->desc,
ref->node->debug_id);
rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
if (ref->strong)
binder_dec_node(ref->node, 1, 1);
hlist_del(&ref->node_entry);
binder_dec_node(ref->node, 0, 1);
if (ref->death) {
binder_debug(BINDER_DEBUG_DEAD_BINDER,
"%d delete ref %d desc %d has death notification\n",
ref->proc->pid, ref->debug_id, ref->desc);
list_del(&ref->death->work.entry);
kfree(ref->death);
binder_stats_deleted(BINDER_STAT_DEATH);
}
kfree(ref);
binder_stats_deleted(BINDER_STAT_REF);
}
static int binder_inc_ref(struct binder_ref *ref, int strong,
struct list_head *target_list)
{
int ret;
if (strong) {
if (ref->strong == 0) {
ret = binder_inc_node(ref->node, 1, 1, target_list);
if (ret)
return ret;
}
ref->strong++;
} else {
if (ref->weak == 0) {
ret = binder_inc_node(ref->node, 0, 1, target_list);
if (ret)
return ret;
}
ref->weak++;
}
return 0;
}
static int binder_dec_ref(struct binder_ref *ref, int strong)
{
if (strong) {
if (ref->strong == 0) {
binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
ref->proc->pid, ref->debug_id,
ref->desc, ref->strong, ref->weak);
return -EINVAL;
}
ref->strong--;
if (ref->strong == 0) {
int ret;
ret = binder_dec_node(ref->node, strong, 1);
if (ret)
return ret;
}
} else {
if (ref->weak == 0) {
binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
ref->proc->pid, ref->debug_id,
ref->desc, ref->strong, ref->weak);
return -EINVAL;
}
ref->weak--;
}
if (ref->strong == 0 && ref->weak == 0)
binder_delete_ref(ref);
return 0;
}
static void binder_pop_transaction(struct binder_thread *target_thread,
struct binder_transaction *t)
{
if (target_thread) {
BUG_ON(target_thread->transaction_stack != t);
BUG_ON(target_thread->transaction_stack->from != target_thread);
target_thread->transaction_stack =
target_thread->transaction_stack->from_parent;
t->from = NULL;
}
t->need_reply = 0;
if (t->buffer)
t->buffer->transaction = NULL;
kfree(t);
binder_stats_deleted(BINDER_STAT_TRANSACTION);
}
static void binder_send_failed_reply(struct binder_transaction *t,
uint32_t error_code)
{
struct binder_thread *target_thread;
struct binder_transaction *next;
BUG_ON(t->flags & TF_ONE_WAY);
while (1) {
target_thread = t->from;
if (target_thread) {
if (target_thread->return_error != BR_OK &&
target_thread->return_error2 == BR_OK) {
target_thread->return_error2 =
target_thread->return_error;
target_thread->return_error = BR_OK;
}
if (target_thread->return_error == BR_OK) {
binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
"send failed reply for transaction %d to %d:%d\n",
t->debug_id,
target_thread->proc->pid,
target_thread->pid);
binder_pop_transaction(target_thread, t);
target_thread->return_error = error_code;
wake_up_interruptible(&target_thread->wait);
} else {
pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
target_thread->proc->pid,
target_thread->pid,
target_thread->return_error);
}
return;
}
next = t->from_parent;
binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
"send failed reply for transaction %d, target dead\n",
t->debug_id);
binder_pop_transaction(target_thread, t);
if (next == NULL) {
binder_debug(BINDER_DEBUG_DEAD_BINDER,
"reply failed, no target thread at root\n");
return;
}
t = next;
binder_debug(BINDER_DEBUG_DEAD_BINDER,
"reply failed, no target thread -- retry %d\n",
t->debug_id);
}
}
/**
* binder_validate_object() - checks for a valid metadata object in a buffer.
* @buffer: binder_buffer that we're parsing.
* @offset: offset in the buffer at which to validate an object.
*
* Return: If there's a valid metadata object at @offset in @buffer, the
* size of that object. Otherwise, it returns zero.
*/
static size_t binder_validate_object(struct binder_buffer *buffer, u64 offset)
{
/* Check if we can read a header first */
struct binder_object_header *hdr;
size_t object_size = 0;
if (offset > buffer->data_size - sizeof(*hdr) ||
buffer->data_size < sizeof(*hdr) ||
!IS_ALIGNED(offset, sizeof(u32)))
return 0;
/* Ok, now see if we can read a complete object. */
hdr = (struct binder_object_header *)(buffer->data + offset);
switch (hdr->type) {
case BINDER_TYPE_BINDER:
case BINDER_TYPE_WEAK_BINDER:
case BINDER_TYPE_HANDLE:
case BINDER_TYPE_WEAK_HANDLE:
object_size = sizeof(struct flat_binder_object);
break;
case BINDER_TYPE_FD:
object_size = sizeof(struct binder_fd_object);
break;
case BINDER_TYPE_PTR:
object_size = sizeof(struct binder_buffer_object);
break;
case BINDER_TYPE_FDA:
object_size = sizeof(struct binder_fd_array_object);
break;
default:
return 0;
}
if (offset <= buffer->data_size - object_size &&
buffer->data_size >= object_size)
return object_size;
else
return 0;
}
/**
* binder_validate_ptr() - validates binder_buffer_object in a binder_buffer.
* @b: binder_buffer containing the object
* @index: index in offset array at which the binder_buffer_object is
* located
* @start: points to the start of the offset array
* @num_valid: the number of valid offsets in the offset array
*
* Return: If @index is within the valid range of the offset array
* described by @start and @num_valid, and if there's a valid
* binder_buffer_object at the offset found in index @index
* of the offset array, that object is returned. Otherwise,
* %NULL is returned.
* Note that the offset found in index @index itself is not
* verified; this function assumes that @num_valid elements
* from @start were previously verified to have valid offsets.
*/
static struct binder_buffer_object *binder_validate_ptr(struct binder_buffer *b,
binder_size_t index,
binder_size_t *start,
binder_size_t num_valid)
{
struct binder_buffer_object *buffer_obj;
binder_size_t *offp;
if (index >= num_valid)
return NULL;
offp = start + index;
buffer_obj = (struct binder_buffer_object *)(b->data + *offp);
if (buffer_obj->hdr.type != BINDER_TYPE_PTR)
return NULL;
return buffer_obj;
}
/**
* binder_validate_fixup() - validates pointer/fd fixups happen in order.
* @b: transaction buffer
* @objects_start start of objects buffer
* @buffer: binder_buffer_object in which to fix up
* @offset: start offset in @buffer to fix up
* @last_obj: last binder_buffer_object that we fixed up in
* @last_min_offset: minimum fixup offset in @last_obj
*
* Return: %true if a fixup in buffer @buffer at offset @offset is
* allowed.
*
* For safety reasons, we only allow fixups inside a buffer to happen
* at increasing offsets; additionally, we only allow fixup on the last
* buffer object that was verified, or one of its parents.
*
* Example of what is allowed:
*
* A
* B (parent = A, offset = 0)
* C (parent = A, offset = 16)
* D (parent = C, offset = 0)
* E (parent = A, offset = 32) // min_offset is 16 (C.parent_offset)
*
* Examples of what is not allowed:
*
* Decreasing offsets within the same parent:
* A
* C (parent = A, offset = 16)
* B (parent = A, offset = 0) // decreasing offset within A
*
* Referring to a parent that wasn't the last object or any of its parents:
* A
* B (parent = A, offset = 0)
* C (parent = A, offset = 0)
* C (parent = A, offset = 16)
* D (parent = B, offset = 0) // B is not A or any of A's parents
*/
static bool binder_validate_fixup(struct binder_buffer *b,
binder_size_t *objects_start,
struct binder_buffer_object *buffer,
binder_size_t fixup_offset,
struct binder_buffer_object *last_obj,
binder_size_t last_min_offset)
{
if (!last_obj) {
/* Nothing to fix up in */
return false;
}
while (last_obj != buffer) {
/*
* Safe to retrieve the parent of last_obj, since it
* was already previously verified by the driver.
*/
if ((last_obj->flags & BINDER_BUFFER_FLAG_HAS_PARENT) == 0)
return false;
last_min_offset = last_obj->parent_offset + sizeof(uintptr_t);
last_obj = (struct binder_buffer_object *)
(b->data + *(objects_start + last_obj->parent));
}
return (fixup_offset >= last_min_offset);
}
static void binder_transaction_buffer_release(struct binder_proc *proc,
struct binder_buffer *buffer,
binder_size_t *failed_at)
{
binder_size_t *offp, *off_start, *off_end;
int debug_id = buffer->debug_id;
binder_debug(BINDER_DEBUG_TRANSACTION,
"%d buffer release %d, size %zd-%zd, failed at %p\n",
proc->pid, buffer->debug_id,
buffer->data_size, buffer->offsets_size, failed_at);
if (buffer->target_node)
binder_dec_node(buffer->target_node, 1, 0);
off_start = (binder_size_t *)(buffer->data +
ALIGN(buffer->data_size, sizeof(void *)));
if (failed_at)
off_end = failed_at;
else
off_end = (void *)off_start + buffer->offsets_size;
for (offp = off_start; offp < off_end; offp++) {
struct binder_object_header *hdr;
size_t object_size = binder_validate_object(buffer, *offp);
if (object_size == 0) {
pr_err("transaction release %d bad object at offset %lld, size %zd\n",
debug_id, (u64)*offp, buffer->data_size);
continue;
}
hdr = (struct binder_object_header *)(buffer->data + *offp);
switch (hdr->type) {
case BINDER_TYPE_BINDER:
case BINDER_TYPE_WEAK_BINDER: {
struct flat_binder_object *fp;
struct binder_node *node;
fp = to_flat_binder_object(hdr);
node = binder_get_node(proc, fp->binder);
if (node == NULL) {
pr_err("transaction release %d bad node %016llx\n",
debug_id, (u64)fp->binder);
break;
}
binder_debug(BINDER_DEBUG_TRANSACTION,
" node %d u%016llx\n",
node->debug_id, (u64)node->ptr);
binder_dec_node(node, hdr->type == BINDER_TYPE_BINDER,
0);
} break;
case BINDER_TYPE_HANDLE:
case BINDER_TYPE_WEAK_HANDLE: {
struct flat_binder_object *fp;
struct binder_ref *ref;
fp = to_flat_binder_object(hdr);
ref = binder_get_ref(proc, fp->handle,
hdr->type == BINDER_TYPE_HANDLE);
if (ref == NULL) {
pr_err("transaction release %d bad handle %d\n",
debug_id, fp->handle);
break;
}
binder_debug(BINDER_DEBUG_TRANSACTION,
" ref %d desc %d (node %d)\n",
ref->debug_id, ref->desc, ref->node->debug_id);
binder_dec_ref(ref, hdr->type == BINDER_TYPE_HANDLE);
} break;
case BINDER_TYPE_FD: {
struct binder_fd_object *fp = to_binder_fd_object(hdr);
binder_debug(BINDER_DEBUG_TRANSACTION,
" fd %d\n", fp->fd);
if (failed_at)
task_close_fd(proc, fp->fd);
} break;
case BINDER_TYPE_PTR:
/*
* Nothing to do here, this will get cleaned up when the
* transaction buffer gets freed
*/
break;
case BINDER_TYPE_FDA: {
struct binder_fd_array_object *fda;
struct binder_buffer_object *parent;
uintptr_t parent_buffer;
u32 *fd_array;
size_t fd_index;
binder_size_t fd_buf_size;
fda = to_binder_fd_array_object(hdr);
parent = binder_validate_ptr(buffer, fda->parent,
off_start,
offp - off_start);
if (!parent) {
pr_err("transaction release %d bad parent offset",
debug_id);
continue;
}
/*
* Since the parent was already fixed up, convert it
* back to kernel address space to access it
*/
parent_buffer = parent->buffer -
proc->user_buffer_offset;
fd_buf_size = sizeof(u32) * fda->num_fds;
if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
pr_err("transaction release %d invalid number of fds (%lld)\n",
debug_id, (u64)fda->num_fds);
continue;
}
if (fd_buf_size > parent->length ||
fda->parent_offset > parent->length - fd_buf_size) {
/* No space for all file descriptors here. */
pr_err("transaction release %d not enough space for %lld fds in buffer\n",
debug_id, (u64)fda->num_fds);
continue;
}
fd_array = (u32 *)(parent_buffer + fda->parent_offset);
for (fd_index = 0; fd_index < fda->num_fds; fd_index++)
task_close_fd(proc, fd_array[fd_index]);
} break;
default:
pr_err("transaction release %d bad object type %x\n",
debug_id, hdr->type);
break;
}
}
}
static int binder_translate_binder(struct flat_binder_object *fp,
struct binder_transaction *t,
struct binder_thread *thread)
{
struct binder_node *node;
struct binder_ref *ref;
struct binder_proc *proc = thread->proc;
struct binder_proc *target_proc = t->to_proc;
node = binder_get_node(proc, fp->binder);
if (!node) {
node = binder_new_node(proc, fp->binder, fp->cookie);
if (!node)
return -ENOMEM;
node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
}
if (fp->cookie != node->cookie) {
binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
proc->pid, thread->pid, (u64)fp->binder,
node->debug_id, (u64)fp->cookie,
(u64)node->cookie);
return -EINVAL;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
if (security_binder_transfer_binder(proc->tsk, target_proc->tsk))
return -EPERM;
#endif
ref = binder_get_ref_for_node(target_proc, node);
if (!ref)
return -EINVAL;
if (fp->hdr.type == BINDER_TYPE_BINDER)
fp->hdr.type = BINDER_TYPE_HANDLE;
else
fp->hdr.type = BINDER_TYPE_WEAK_HANDLE;
fp->binder = 0;
fp->handle = ref->desc;
fp->cookie = 0;
binder_inc_ref(ref, fp->hdr.type == BINDER_TYPE_HANDLE, &thread->todo);
trace_binder_transaction_node_to_ref(t, node, ref);
binder_debug(BINDER_DEBUG_TRANSACTION,
" node %d u%016llx -> ref %d desc %d\n",
node->debug_id, (u64)node->ptr,
ref->debug_id, ref->desc);
return 0;
}
static int binder_translate_handle(struct flat_binder_object *fp,
struct binder_transaction *t,
struct binder_thread *thread)
{
struct binder_ref *ref;
struct binder_proc *proc = thread->proc;
struct binder_proc *target_proc = t->to_proc;
ref = binder_get_ref(proc, fp->handle,
fp->hdr.type == BINDER_TYPE_HANDLE);
if (!ref) {
binder_user_error("%d:%d got transaction with invalid handle, %d\n",
proc->pid, thread->pid, fp->handle);
return -EINVAL;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
if (security_binder_transfer_binder(proc->tsk, target_proc->tsk))
return -EPERM;
#endif
if (ref->node->proc == target_proc) {
if (fp->hdr.type == BINDER_TYPE_HANDLE)
fp->hdr.type = BINDER_TYPE_BINDER;
else
fp->hdr.type = BINDER_TYPE_WEAK_BINDER;
fp->binder = ref->node->ptr;
fp->cookie = ref->node->cookie;
binder_inc_node(ref->node, fp->hdr.type == BINDER_TYPE_BINDER,
0, NULL);
trace_binder_transaction_ref_to_node(t, ref);
binder_debug(BINDER_DEBUG_TRANSACTION,
" ref %d desc %d -> node %d u%016llx\n",
ref->debug_id, ref->desc, ref->node->debug_id,
(u64)ref->node->ptr);
} else {
struct binder_ref *new_ref;
new_ref = binder_get_ref_for_node(target_proc, ref->node);
if (!new_ref)
return -EINVAL;
fp->binder = 0;
fp->handle = new_ref->desc;
fp->cookie = 0;
binder_inc_ref(new_ref, fp->hdr.type == BINDER_TYPE_HANDLE,
NULL);
trace_binder_transaction_ref_to_ref(t, ref, new_ref);
binder_debug(BINDER_DEBUG_TRANSACTION,
" ref %d desc %d -> ref %d desc %d (node %d)\n",
ref->debug_id, ref->desc, new_ref->debug_id,
new_ref->desc, ref->node->debug_id);
}
return 0;
}
static int binder_translate_fd(int fd,
struct binder_transaction *t,
struct binder_thread *thread,
struct binder_transaction *in_reply_to)
{
struct binder_proc *proc = thread->proc;
struct binder_proc *target_proc = t->to_proc;
int target_fd;
struct file *file;
int ret;
bool target_allows_fd;
if (in_reply_to)
target_allows_fd = !!(in_reply_to->flags & TF_ACCEPT_FDS);
else
target_allows_fd = t->buffer->target_node->accept_fds;
if (!target_allows_fd) {
binder_user_error("%d:%d got %s with fd, %d, but target does not allow fds\n",
proc->pid, thread->pid,
in_reply_to ? "reply" : "transaction",
fd);
ret = -EPERM;
goto err_fd_not_accepted;
}
file = fget(fd);
if (!file) {
binder_user_error("%d:%d got transaction with invalid fd, %d\n",
proc->pid, thread->pid, fd);
ret = -EBADF;
goto err_fget;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
ret = security_binder_transfer_file(proc->tsk, target_proc->tsk, file);
if (ret < 0) {
ret = -EPERM;
goto err_security;
}
#endif
target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
if (target_fd < 0) {
ret = -ENOMEM;
goto err_get_unused_fd;
}
task_fd_install(target_proc, target_fd, file);
trace_binder_transaction_fd(t, fd, target_fd);
binder_debug(BINDER_DEBUG_TRANSACTION, " fd %d -> %d\n",
fd, target_fd);
return target_fd;
err_get_unused_fd:
err_security:
fput(file);
err_fget:
err_fd_not_accepted:
return ret;
}
static int binder_translate_fd_array(struct binder_fd_array_object *fda,
struct binder_buffer_object *parent,
struct binder_transaction *t,
struct binder_thread *thread,
struct binder_transaction *in_reply_to)
{
binder_size_t fdi, fd_buf_size, num_installed_fds;
int target_fd;
uintptr_t parent_buffer;
u32 *fd_array;
struct binder_proc *proc = thread->proc;
struct binder_proc *target_proc = t->to_proc;
fd_buf_size = sizeof(u32) * fda->num_fds;
if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
binder_user_error("%d:%d got transaction with invalid number of fds (%lld)\n",
proc->pid, thread->pid, (u64)fda->num_fds);
return -EINVAL;
}
if (fd_buf_size > parent->length ||
fda->parent_offset > parent->length - fd_buf_size) {
/* No space for all file descriptors here. */
binder_user_error("%d:%d not enough space to store %lld fds in buffer\n",
proc->pid, thread->pid, (u64)fda->num_fds);
return -EINVAL;
}
/*
* Since the parent was already fixed up, convert it
* back to the kernel address space to access it
*/
parent_buffer = parent->buffer - target_proc->user_buffer_offset;
fd_array = (u32 *)(parent_buffer + fda->parent_offset);
if (!IS_ALIGNED((unsigned long)fd_array, sizeof(u32))) {
binder_user_error("%d:%d parent offset not aligned correctly.\n",
proc->pid, thread->pid);
return -EINVAL;
}
for (fdi = 0; fdi < fda->num_fds; fdi++) {
target_fd = binder_translate_fd(fd_array[fdi], t, thread,
in_reply_to);
if (target_fd < 0)
goto err_translate_fd_failed;
fd_array[fdi] = target_fd;
}
return 0;
err_translate_fd_failed:
/*
* Failed to allocate fd or security error, free fds
* installed so far.
*/
num_installed_fds = fdi;
for (fdi = 0; fdi < num_installed_fds; fdi++)
task_close_fd(target_proc, fd_array[fdi]);
return target_fd;
}
static int binder_fixup_parent(struct binder_transaction *t,
struct binder_thread *thread,
struct binder_buffer_object *bp,
binder_size_t *off_start,
binder_size_t num_valid,
struct binder_buffer_object *last_fixup_obj,
binder_size_t last_fixup_min_off)
{
struct binder_buffer_object *parent;
u8 *parent_buffer;
struct binder_buffer *b = t->buffer;
struct binder_proc *proc = thread->proc;
struct binder_proc *target_proc = t->to_proc;
if (!(bp->flags & BINDER_BUFFER_FLAG_HAS_PARENT))
return 0;
parent = binder_validate_ptr(b, bp->parent, off_start, num_valid);
if (!parent) {
binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
proc->pid, thread->pid);
return -EINVAL;
}
if (!binder_validate_fixup(b, off_start,
parent, bp->parent_offset,
last_fixup_obj,
last_fixup_min_off)) {
binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
proc->pid, thread->pid);
return -EINVAL;
}
if (parent->length < sizeof(binder_uintptr_t) ||
bp->parent_offset > parent->length - sizeof(binder_uintptr_t)) {
/* No space for a pointer here! */
binder_user_error("%d:%d got transaction with invalid parent offset\n",
proc->pid, thread->pid);
return -EINVAL;
}
parent_buffer = (u8 *)(parent->buffer -
target_proc->user_buffer_offset);
*(binder_uintptr_t *)(parent_buffer + bp->parent_offset) = bp->buffer;
return 0;
}
static void binder_transaction(struct binder_proc *proc,
struct binder_thread *thread,
struct binder_transaction_data *tr, int reply,
binder_size_t extra_buffers_size)
{
int ret;
struct binder_transaction *t;
struct binder_work *tcomplete;
binder_size_t *offp, *off_end, *off_start;
binder_size_t off_min;
u8 *sg_bufp, *sg_buf_end;
struct binder_proc *target_proc;
struct binder_thread *target_thread = NULL;
struct binder_node *target_node = NULL;
struct list_head *target_list;
wait_queue_head_t *target_wait;
struct binder_transaction *in_reply_to = NULL;
struct binder_transaction_log_entry *e;
uint32_t return_error;
struct binder_buffer_object *last_fixup_obj = NULL;
binder_size_t last_fixup_min_off = 0;
struct binder_context *context = proc->context;
e = binder_transaction_log_add(&binder_transaction_log);
e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
e->from_proc = proc->pid;
e->from_thread = thread->pid;
e->target_handle = tr->target.handle;
e->data_size = tr->data_size;
e->offsets_size = tr->offsets_size;
e->context_name = proc->context->name;
if (reply) {
in_reply_to = thread->transaction_stack;
if (in_reply_to == NULL) {
binder_user_error("%d:%d got reply transaction with no transaction stack\n",
proc->pid, thread->pid);
return_error = BR_FAILED_REPLY;
goto err_empty_call_stack;
}
binder_set_nice(in_reply_to->saved_priority);
if (in_reply_to->to_thread != thread) {
binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
proc->pid, thread->pid, in_reply_to->debug_id,
in_reply_to->to_proc ?
in_reply_to->to_proc->pid : 0,
in_reply_to->to_thread ?
in_reply_to->to_thread->pid : 0);
return_error = BR_FAILED_REPLY;
in_reply_to = NULL;
goto err_bad_call_stack;
}
thread->transaction_stack = in_reply_to->to_parent;
target_thread = in_reply_to->from;
if (target_thread == NULL) {
return_error = BR_DEAD_REPLY;
goto err_dead_binder;
}
if (target_thread->transaction_stack != in_reply_to) {
binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
proc->pid, thread->pid,
target_thread->transaction_stack ?
target_thread->transaction_stack->debug_id : 0,
in_reply_to->debug_id);
return_error = BR_FAILED_REPLY;
in_reply_to = NULL;
target_thread = NULL;
goto err_dead_binder;
}
target_proc = target_thread->proc;
} else {
if (tr->target.handle) {
struct binder_ref *ref;
ref = binder_get_ref(proc, tr->target.handle, true);
if (ref == NULL) {
binder_user_error("%d:%d got transaction to invalid handle\n",
proc->pid, thread->pid);
return_error = BR_FAILED_REPLY;
goto err_invalid_target_handle;
}
target_node = ref->node;
} else {
target_node = context->binder_context_mgr_node;
if (target_node == NULL) {
return_error = BR_DEAD_REPLY;
goto err_no_context_mgr_node;
}
}
e->to_node = target_node->debug_id;
target_proc = target_node->proc;
if (target_proc == NULL) {
return_error = BR_DEAD_REPLY;
goto err_dead_binder;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
if (security_binder_transaction(proc->tsk,
target_proc->tsk) < 0) {
return_error = BR_FAILED_REPLY;
goto err_invalid_target_handle;
}
#endif
if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
struct binder_transaction *tmp;
tmp = thread->transaction_stack;
if (tmp->to_thread != thread) {
binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
proc->pid, thread->pid, tmp->debug_id,
tmp->to_proc ? tmp->to_proc->pid : 0,
tmp->to_thread ?
tmp->to_thread->pid : 0);
return_error = BR_FAILED_REPLY;
goto err_bad_call_stack;
}
while (tmp) {
if (tmp->from && tmp->from->proc == target_proc)
target_thread = tmp->from;
tmp = tmp->from_parent;
}
}
}
if (target_thread) {
e->to_thread = target_thread->pid;
target_list = &target_thread->todo;
target_wait = &target_thread->wait;
} else {
target_list = &target_proc->todo;
target_wait = &target_proc->wait;
}
e->to_proc = target_proc->pid;
/* TODO: reuse incoming transaction for reply */
t = kzalloc(sizeof(*t), GFP_KERNEL);
if (t == NULL) {
return_error = BR_FAILED_REPLY;
goto err_alloc_t_failed;
}
binder_stats_created(BINDER_STAT_TRANSACTION);
tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
if (tcomplete == NULL) {
return_error = BR_FAILED_REPLY;
goto err_alloc_tcomplete_failed;
}
binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
t->debug_id = ++binder_last_id;
e->debug_id = t->debug_id;
if (reply)
binder_debug(BINDER_DEBUG_TRANSACTION,
"%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld-%lld\n",
proc->pid, thread->pid, t->debug_id,
target_proc->pid, target_thread->pid,
(u64)tr->data.ptr.buffer,
(u64)tr->data.ptr.offsets,
(u64)tr->data_size, (u64)tr->offsets_size,
(u64)extra_buffers_size);
else
binder_debug(BINDER_DEBUG_TRANSACTION,
"%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld-%lld\n",
proc->pid, thread->pid, t->debug_id,
target_proc->pid, target_node->debug_id,
(u64)tr->data.ptr.buffer,
(u64)tr->data.ptr.offsets,
(u64)tr->data_size, (u64)tr->offsets_size,
(u64)extra_buffers_size);
if (!reply && !(tr->flags & TF_ONE_WAY))
t->from = thread;
else
t->from = NULL;
t->sender_euid = task_euid(proc->tsk);
t->to_proc = target_proc;
t->to_thread = target_thread;
t->code = tr->code;
t->flags = tr->flags;
t->priority = task_nice(current);
trace_binder_transaction(reply, t, target_node);
t->buffer = binder_alloc_buf(target_proc, tr->data_size,
tr->offsets_size, extra_buffers_size,
!reply && (t->flags & TF_ONE_WAY));
if (t->buffer == NULL) {
return_error = BR_FAILED_REPLY;
goto err_binder_alloc_buf_failed;
}
t->buffer->allow_user_free = 0;
t->buffer->debug_id = t->debug_id;
t->buffer->transaction = t;
t->buffer->target_node = target_node;
trace_binder_transaction_alloc_buf(t->buffer);
if (target_node)
binder_inc_node(target_node, 1, 0, NULL);
off_start = (binder_size_t *)(t->buffer->data +
ALIGN(tr->data_size, sizeof(void *)));
offp = off_start;
if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
tr->data.ptr.buffer, tr->data_size)) {
binder_user_error("%d:%d got transaction with invalid data ptr\n",
proc->pid, thread->pid);
return_error = BR_FAILED_REPLY;
goto err_copy_data_failed;
}
if (copy_from_user(offp, (const void __user *)(uintptr_t)
tr->data.ptr.offsets, tr->offsets_size)) {
binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
proc->pid, thread->pid);
return_error = BR_FAILED_REPLY;
goto err_copy_data_failed;
}
if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
proc->pid, thread->pid, (u64)tr->offsets_size);
return_error = BR_FAILED_REPLY;
goto err_bad_offset;
}
if (!IS_ALIGNED(extra_buffers_size, sizeof(u64))) {
binder_user_error("%d:%d got transaction with unaligned buffers size, %lld\n",
proc->pid, thread->pid,
(u64)extra_buffers_size);
return_error = BR_FAILED_REPLY;
goto err_bad_offset;
}
off_end = (void *)off_start + tr->offsets_size;
sg_bufp = (u8 *)(PTR_ALIGN(off_end, sizeof(void *)));
sg_buf_end = sg_bufp + extra_buffers_size;
off_min = 0;
for (; offp < off_end; offp++) {
struct binder_object_header *hdr;
size_t object_size = binder_validate_object(t->buffer, *offp);
if (object_size == 0 || *offp < off_min) {
binder_user_error("%d:%d got transaction with invalid offset (%lld, min %lld max %lld) or object.\n",
proc->pid, thread->pid, (u64)*offp,
(u64)off_min,
(u64)t->buffer->data_size);
return_error = BR_FAILED_REPLY;
goto err_bad_offset;
}
hdr = (struct binder_object_header *)(t->buffer->data + *offp);
off_min = *offp + object_size;
switch (hdr->type) {
case BINDER_TYPE_BINDER:
case BINDER_TYPE_WEAK_BINDER: {
struct flat_binder_object *fp;
fp = to_flat_binder_object(hdr);
ret = binder_translate_binder(fp, t, thread);
if (ret < 0) {
return_error = BR_FAILED_REPLY;
goto err_translate_failed;
}
} break;
case BINDER_TYPE_HANDLE:
case BINDER_TYPE_WEAK_HANDLE: {
struct flat_binder_object *fp;
fp = to_flat_binder_object(hdr);
ret = binder_translate_handle(fp, t, thread);
if (ret < 0) {
return_error = BR_FAILED_REPLY;
goto err_translate_failed;
}
} break;
case BINDER_TYPE_FD: {
struct binder_fd_object *fp = to_binder_fd_object(hdr);
int target_fd = binder_translate_fd(fp->fd, t, thread,
in_reply_to);
if (target_fd < 0) {
return_error = BR_FAILED_REPLY;
goto err_translate_failed;
}
fp->pad_binder = 0;
fp->fd = target_fd;
} break;
case BINDER_TYPE_FDA: {
struct binder_fd_array_object *fda =
to_binder_fd_array_object(hdr);
struct binder_buffer_object *parent =
binder_validate_ptr(t->buffer, fda->parent,
off_start,
offp - off_start);
if (!parent) {
binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
proc->pid, thread->pid);
return_error = BR_FAILED_REPLY;
goto err_bad_parent;
}
if (!binder_validate_fixup(t->buffer, off_start,
parent, fda->parent_offset,
last_fixup_obj,
last_fixup_min_off)) {
binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
proc->pid, thread->pid);
return_error = BR_FAILED_REPLY;
goto err_bad_parent;
}
ret = binder_translate_fd_array(fda, parent, t, thread,
in_reply_to);
if (ret < 0) {
return_error = BR_FAILED_REPLY;
goto err_translate_failed;
}
last_fixup_obj = parent;
last_fixup_min_off =
fda->parent_offset + sizeof(u32) * fda->num_fds;
} break;
case BINDER_TYPE_PTR: {
struct binder_buffer_object *bp =
to_binder_buffer_object(hdr);
size_t buf_left = sg_buf_end - sg_bufp;
if (bp->length > buf_left) {
binder_user_error("%d:%d got transaction with too large buffer\n",
proc->pid, thread->pid);
return_error = BR_FAILED_REPLY;
goto err_bad_offset;
}
if (copy_from_user(sg_bufp,
(const void __user *)(uintptr_t)
bp->buffer, bp->length)) {
binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
proc->pid, thread->pid);
return_error = BR_FAILED_REPLY;
goto err_copy_data_failed;
}
/* Fixup buffer pointer to target proc address space */
bp->buffer = (uintptr_t)sg_bufp +
target_proc->user_buffer_offset;
sg_bufp += ALIGN(bp->length, sizeof(u64));
ret = binder_fixup_parent(t, thread, bp, off_start,
offp - off_start,
last_fixup_obj,
last_fixup_min_off);
if (ret < 0) {
return_error = BR_FAILED_REPLY;
goto err_translate_failed;
}
last_fixup_obj = bp;
last_fixup_min_off = 0;
} break;
default:
binder_user_error("%d:%d got transaction with invalid object type, %x\n",
proc->pid, thread->pid, hdr->type);
return_error = BR_FAILED_REPLY;
goto err_bad_object_type;
}
}
if (reply) {
BUG_ON(t->buffer->async_transaction != 0);
binder_pop_transaction(target_thread, in_reply_to);
} else if (!(t->flags & TF_ONE_WAY)) {
BUG_ON(t->buffer->async_transaction != 0);
t->need_reply = 1;
t->from_parent = thread->transaction_stack;
thread->transaction_stack = t;
} else {
BUG_ON(target_node == NULL);
BUG_ON(t->buffer->async_transaction != 1);
if (target_node->has_async_transaction) {
target_list = &target_node->async_todo;
target_wait = NULL;
} else
target_node->has_async_transaction = 1;
}
t->work.type = BINDER_WORK_TRANSACTION;
list_add_tail(&t->work.entry, target_list);
tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
list_add_tail(&tcomplete->entry, &thread->todo);
if (target_wait) {
if (reply || !(t->flags & TF_ONE_WAY))
wake_up_interruptible_sync(target_wait);
else
wake_up_interruptible(target_wait);
}
return;
err_translate_failed:
err_bad_object_type:
err_bad_offset:
err_bad_parent:
err_copy_data_failed:
trace_binder_transaction_failed_buffer_release(t->buffer);
binder_transaction_buffer_release(target_proc, t->buffer, offp);
t->buffer->transaction = NULL;
binder_free_buf(target_proc, t->buffer);
err_binder_alloc_buf_failed:
kfree(tcomplete);
binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
err_alloc_tcomplete_failed:
kfree(t);
binder_stats_deleted(BINDER_STAT_TRANSACTION);
err_alloc_t_failed:
err_bad_call_stack:
err_empty_call_stack:
err_dead_binder:
err_invalid_target_handle:
err_no_context_mgr_node:
binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
"%d:%d transaction failed %d, size %lld-%lld\n",
proc->pid, thread->pid, return_error,
(u64)tr->data_size, (u64)tr->offsets_size);
{
struct binder_transaction_log_entry *fe;
fe = binder_transaction_log_add(&binder_transaction_log_failed);
*fe = *e;
}
BUG_ON(thread->return_error != BR_OK);
if (in_reply_to) {
thread->return_error = BR_TRANSACTION_COMPLETE;
binder_send_failed_reply(in_reply_to, return_error);
} else
thread->return_error = return_error;
}
static int binder_thread_write(struct binder_proc *proc,
struct binder_thread *thread,
binder_uintptr_t binder_buffer, size_t size,
binder_size_t *consumed)
{
uint32_t cmd;
struct binder_context *context = proc->context;
void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
void __user *ptr = buffer + *consumed;
void __user *end = buffer + size;
while (ptr < end && thread->return_error == BR_OK) {
if (get_user(cmd, (uint32_t __user *)ptr))
return -EFAULT;
ptr += sizeof(uint32_t);
trace_binder_command(cmd);
if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
binder_stats.bc[_IOC_NR(cmd)]++;
proc->stats.bc[_IOC_NR(cmd)]++;
thread->stats.bc[_IOC_NR(cmd)]++;
}
switch (cmd) {
case BC_INCREFS:
case BC_ACQUIRE:
case BC_RELEASE:
case BC_DECREFS: {
uint32_t target;
struct binder_ref *ref;
const char *debug_string;
if (get_user(target, (uint32_t __user *)ptr))
return -EFAULT;
ptr += sizeof(uint32_t);
if (target == 0 && context->binder_context_mgr_node &&
(cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
ref = binder_get_ref_for_node(proc,
context->binder_context_mgr_node);
if (ref->desc != target) {
binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
proc->pid, thread->pid,
ref->desc);
}
} else
ref = binder_get_ref(proc, target,
cmd == BC_ACQUIRE ||
cmd == BC_RELEASE);
if (ref == NULL) {
binder_user_error("%d:%d refcount change on invalid ref %d\n",
proc->pid, thread->pid, target);
break;
}
switch (cmd) {
case BC_INCREFS:
debug_string = "IncRefs";
binder_inc_ref(ref, 0, NULL);
break;
case BC_ACQUIRE:
debug_string = "Acquire";
binder_inc_ref(ref, 1, NULL);
break;
case BC_RELEASE:
debug_string = "Release";
binder_dec_ref(ref, 1);
break;
case BC_DECREFS:
default:
debug_string = "DecRefs";
binder_dec_ref(ref, 0);
break;
}
binder_debug(BINDER_DEBUG_USER_REFS,
"%d:%d %s ref %d desc %d s %d w %d for node %d\n",
proc->pid, thread->pid, debug_string, ref->debug_id,
ref->desc, ref->strong, ref->weak, ref->node->debug_id);
break;
}
case BC_INCREFS_DONE:
case BC_ACQUIRE_DONE: {
binder_uintptr_t node_ptr;
binder_uintptr_t cookie;
struct binder_node *node;
if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
return -EFAULT;
ptr += sizeof(binder_uintptr_t);
if (get_user(cookie, (binder_uintptr_t __user *)ptr))
return -EFAULT;
ptr += sizeof(binder_uintptr_t);
node = binder_get_node(proc, node_ptr);
if (node == NULL) {
binder_user_error("%d:%d %s u%016llx no match\n",
proc->pid, thread->pid,
cmd == BC_INCREFS_DONE ?
"BC_INCREFS_DONE" :
"BC_ACQUIRE_DONE",
(u64)node_ptr);
break;
}
if (cookie != node->cookie) {
binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
proc->pid, thread->pid,
cmd == BC_INCREFS_DONE ?
"BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
(u64)node_ptr, node->debug_id,
(u64)cookie, (u64)node->cookie);
break;
}
if (cmd == BC_ACQUIRE_DONE) {
if (node->pending_strong_ref == 0) {
binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
proc->pid, thread->pid,
node->debug_id);
break;
}
node->pending_strong_ref = 0;
} else {
if (node->pending_weak_ref == 0) {
binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
proc->pid, thread->pid,
node->debug_id);
break;
}
node->pending_weak_ref = 0;
}
binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
binder_debug(BINDER_DEBUG_USER_REFS,
"%d:%d %s node %d ls %d lw %d\n",
proc->pid, thread->pid,
cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
node->debug_id, node->local_strong_refs, node->local_weak_refs);
break;
}
case BC_ATTEMPT_ACQUIRE:
pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
return -EINVAL;
case BC_ACQUIRE_RESULT:
pr_err("BC_ACQUIRE_RESULT not supported\n");
return -EINVAL;
case BC_FREE_BUFFER: {
binder_uintptr_t data_ptr;
struct binder_buffer *buffer;
if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
return -EFAULT;
ptr += sizeof(binder_uintptr_t);
buffer = binder_buffer_lookup(proc, data_ptr);
if (buffer == NULL) {
binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
proc->pid, thread->pid, (u64)data_ptr);
break;
}
if (!buffer->allow_user_free) {
binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
proc->pid, thread->pid, (u64)data_ptr);
break;
}
binder_debug(BINDER_DEBUG_FREE_BUFFER,
"%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
proc->pid, thread->pid, (u64)data_ptr,
buffer->debug_id,
buffer->transaction ? "active" : "finished");
if (buffer->transaction) {
buffer->transaction->buffer = NULL;
buffer->transaction = NULL;
}
if (buffer->async_transaction && buffer->target_node) {
BUG_ON(!buffer->target_node->has_async_transaction);
if (list_empty(&buffer->target_node->async_todo))
buffer->target_node->has_async_transaction = 0;
else
list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
}
trace_binder_transaction_buffer_release(buffer);
binder_transaction_buffer_release(proc, buffer, NULL);
binder_free_buf(proc, buffer);
break;
}
case BC_TRANSACTION_SG:
case BC_REPLY_SG: {
struct binder_transaction_data_sg tr;
if (copy_from_user(&tr, ptr, sizeof(tr)))
return -EFAULT;
ptr += sizeof(tr);
binder_transaction(proc, thread, &tr.transaction_data,
cmd == BC_REPLY_SG, tr.buffers_size);
break;
}
case BC_TRANSACTION:
case BC_REPLY: {
struct binder_transaction_data tr;
if (copy_from_user(&tr, ptr, sizeof(tr)))
return -EFAULT;
ptr += sizeof(tr);
binder_transaction(proc, thread, &tr,
cmd == BC_REPLY, 0);
break;
}
case BC_REGISTER_LOOPER:
binder_debug(BINDER_DEBUG_THREADS,
"%d:%d BC_REGISTER_LOOPER\n",
proc->pid, thread->pid);
if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
thread->looper |= BINDER_LOOPER_STATE_INVALID;
binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
proc->pid, thread->pid);
} else if (proc->requested_threads == 0) {
thread->looper |= BINDER_LOOPER_STATE_INVALID;
binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
proc->pid, thread->pid);
} else {
proc->requested_threads--;
proc->requested_threads_started++;
}
thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
break;
case BC_ENTER_LOOPER:
binder_debug(BINDER_DEBUG_THREADS,
"%d:%d BC_ENTER_LOOPER\n",
proc->pid, thread->pid);
if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
thread->looper |= BINDER_LOOPER_STATE_INVALID;
binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
proc->pid, thread->pid);
}
thread->looper |= BINDER_LOOPER_STATE_ENTERED;
break;
case BC_EXIT_LOOPER:
binder_debug(BINDER_DEBUG_THREADS,
"%d:%d BC_EXIT_LOOPER\n",
proc->pid, thread->pid);
thread->looper |= BINDER_LOOPER_STATE_EXITED;
break;
case BC_REQUEST_DEATH_NOTIFICATION:
case BC_CLEAR_DEATH_NOTIFICATION: {
uint32_t target;
binder_uintptr_t cookie;
struct binder_ref *ref;
struct binder_ref_death *death;
if (get_user(target, (uint32_t __user *)ptr))
return -EFAULT;
ptr += sizeof(uint32_t);
if (get_user(cookie, (binder_uintptr_t __user *)ptr))
return -EFAULT;
ptr += sizeof(binder_uintptr_t);
ref = binder_get_ref(proc, target, false);
if (ref == NULL) {
binder_user_error("%d:%d %s invalid ref %d\n",
proc->pid, thread->pid,
cmd == BC_REQUEST_DEATH_NOTIFICATION ?
"BC_REQUEST_DEATH_NOTIFICATION" :
"BC_CLEAR_DEATH_NOTIFICATION",
target);
break;
}
binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
"%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
proc->pid, thread->pid,
cmd == BC_REQUEST_DEATH_NOTIFICATION ?
"BC_REQUEST_DEATH_NOTIFICATION" :
"BC_CLEAR_DEATH_NOTIFICATION",
(u64)cookie, ref->debug_id, ref->desc,
ref->strong, ref->weak, ref->node->debug_id);
if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
if (ref->death) {
binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
proc->pid, thread->pid);
break;
}
death = kzalloc(sizeof(*death), GFP_KERNEL);
if (death == NULL) {
thread->return_error = BR_ERROR;
binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
"%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
proc->pid, thread->pid);
break;
}
binder_stats_created(BINDER_STAT_DEATH);
INIT_LIST_HEAD(&death->work.entry);
death->cookie = cookie;
ref->death = death;
if (ref->node->proc == NULL) {
ref->death->work.type = BINDER_WORK_DEAD_BINDER;
if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
list_add_tail(&ref->death->work.entry, &thread->todo);
} else {
list_add_tail(&ref->death->work.entry, &proc->todo);
wake_up_interruptible(&proc->wait);
}
}
} else {
if (ref->death == NULL) {
binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
proc->pid, thread->pid);
break;
}
death = ref->death;
if (death->cookie != cookie) {
binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
proc->pid, thread->pid,
(u64)death->cookie,
(u64)cookie);
break;
}
ref->death = NULL;
if (list_empty(&death->work.entry)) {
death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
list_add_tail(&death->work.entry, &thread->todo);
} else {
list_add_tail(&death->work.entry, &proc->todo);
wake_up_interruptible(&proc->wait);
}
} else {
BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
}
}
} break;
case BC_DEAD_BINDER_DONE: {
struct binder_work *w;
binder_uintptr_t cookie;
struct binder_ref_death *death = NULL;
if (get_user(cookie, (binder_uintptr_t __user *)ptr))
return -EFAULT;
ptr += sizeof(cookie);
list_for_each_entry(w, &proc->delivered_death, entry) {
struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
if (tmp_death->cookie == cookie) {
death = tmp_death;
break;
}
}
binder_debug(BINDER_DEBUG_DEAD_BINDER,
"%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
proc->pid, thread->pid, (u64)cookie,
death);
if (death == NULL) {
binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
proc->pid, thread->pid, (u64)cookie);
break;
}
list_del_init(&death->work.entry);
if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
list_add_tail(&death->work.entry, &thread->todo);
} else {
list_add_tail(&death->work.entry, &proc->todo);
wake_up_interruptible(&proc->wait);
}
}
} break;
default:
pr_err("%d:%d unknown command %d\n",
proc->pid, thread->pid, cmd);
return -EINVAL;
}
*consumed = ptr - buffer;
}
return 0;
}
static void binder_stat_br(struct binder_proc *proc,
struct binder_thread *thread, uint32_t cmd)
{
trace_binder_return(cmd);
if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
binder_stats.br[_IOC_NR(cmd)]++;
proc->stats.br[_IOC_NR(cmd)]++;
thread->stats.br[_IOC_NR(cmd)]++;
}
}
static int binder_has_proc_work(struct binder_proc *proc,
struct binder_thread *thread)
{
return !list_empty(&proc->todo) ||
(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
}
static int binder_has_thread_work(struct binder_thread *thread)
{
return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
}
static int binder_thread_read(struct binder_proc *proc,
struct binder_thread *thread,
binder_uintptr_t binder_buffer, size_t size,
binder_size_t *consumed, int non_block)
{
void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
void __user *ptr = buffer + *consumed;
void __user *end = buffer + size;
int ret = 0;
int wait_for_proc_work;
if (*consumed == 0) {
if (put_user(BR_NOOP, (uint32_t __user *)ptr))
return -EFAULT;
ptr += sizeof(uint32_t);
}
retry:
wait_for_proc_work = thread->transaction_stack == NULL &&
list_empty(&thread->todo);
if (thread->return_error != BR_OK && ptr < end) {
if (thread->return_error2 != BR_OK) {
if (put_user(thread->return_error2, (uint32_t __user *)ptr))
return -EFAULT;
ptr += sizeof(uint32_t);
binder_stat_br(proc, thread, thread->return_error2);
if (ptr == end)
goto done;
thread->return_error2 = BR_OK;
}
if (put_user(thread->return_error, (uint32_t __user *)ptr))
return -EFAULT;
ptr += sizeof(uint32_t);
binder_stat_br(proc, thread, thread->return_error);
thread->return_error = BR_OK;
goto done;
}
thread->looper |= BINDER_LOOPER_STATE_WAITING;
if (wait_for_proc_work)
proc->ready_threads++;
binder_unlock(__func__);
trace_binder_wait_for_work(wait_for_proc_work,
!!thread->transaction_stack,
!list_empty(&thread->todo));
if (wait_for_proc_work) {
if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
BINDER_LOOPER_STATE_ENTERED))) {
binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
proc->pid, thread->pid, thread->looper);
wait_event_interruptible(binder_user_error_wait,
binder_stop_on_user_error < 2);
}
binder_set_nice(proc->default_priority);
if (non_block) {
if (!binder_has_proc_work(proc, thread))
ret = -EAGAIN;
} else
ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
} else {
if (non_block) {
if (!binder_has_thread_work(thread))
ret = -EAGAIN;
} else
ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
}
binder_lock(__func__);
if (wait_for_proc_work)
proc->ready_threads--;
thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
if (ret)
return ret;
while (1) {
uint32_t cmd;
struct binder_transaction_data tr;
struct binder_work *w;
struct binder_transaction *t = NULL;
if (!list_empty(&thread->todo)) {
w = list_first_entry(&thread->todo, struct binder_work,
entry);
} else if (!list_empty(&proc->todo) && wait_for_proc_work) {
w = list_first_entry(&proc->todo, struct binder_work,
entry);
} else {
/* no data added */
if (ptr - buffer == 4 &&
!(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
goto retry;
break;
}
if (end - ptr < sizeof(tr) + 4)
break;
switch (w->type) {
case BINDER_WORK_TRANSACTION: {
t = container_of(w, struct binder_transaction, work);
} break;
case BINDER_WORK_TRANSACTION_COMPLETE: {
cmd = BR_TRANSACTION_COMPLETE;
if (put_user(cmd, (uint32_t __user *)ptr))
return -EFAULT;
ptr += sizeof(uint32_t);
binder_stat_br(proc, thread, cmd);
binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
"%d:%d BR_TRANSACTION_COMPLETE\n",
proc->pid, thread->pid);
list_del(&w->entry);
kfree(w);
binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
} break;
case BINDER_WORK_NODE: {
struct binder_node *node = container_of(w, struct binder_node, work);
uint32_t cmd = BR_NOOP;
const char *cmd_name;
int strong = node->internal_strong_refs || node->local_strong_refs;
int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
if (weak && !node->has_weak_ref) {
cmd = BR_INCREFS;
cmd_name = "BR_INCREFS";
node->has_weak_ref = 1;
node->pending_weak_ref = 1;
node->local_weak_refs++;
} else if (strong && !node->has_strong_ref) {
cmd = BR_ACQUIRE;
cmd_name = "BR_ACQUIRE";
node->has_strong_ref = 1;
node->pending_strong_ref = 1;
node->local_strong_refs++;
} else if (!strong && node->has_strong_ref) {
cmd = BR_RELEASE;
cmd_name = "BR_RELEASE";
node->has_strong_ref = 0;
} else if (!weak && node->has_weak_ref) {
cmd = BR_DECREFS;
cmd_name = "BR_DECREFS";
node->has_weak_ref = 0;
}
if (cmd != BR_NOOP) {
if (put_user(cmd, (uint32_t __user *)ptr))
return -EFAULT;
ptr += sizeof(uint32_t);
if (put_user(node->ptr,
(binder_uintptr_t __user *)ptr))
return -EFAULT;
ptr += sizeof(binder_uintptr_t);
if (put_user(node->cookie,
(binder_uintptr_t __user *)ptr))
return -EFAULT;
ptr += sizeof(binder_uintptr_t);
binder_stat_br(proc, thread, cmd);
binder_debug(BINDER_DEBUG_USER_REFS,
"%d:%d %s %d u%016llx c%016llx\n",
proc->pid, thread->pid, cmd_name,
node->debug_id,
(u64)node->ptr, (u64)node->cookie);
} else {
list_del_init(&w->entry);
if (!weak && !strong) {
binder_debug(BINDER_DEBUG_INTERNAL_REFS,
"%d:%d node %d u%016llx c%016llx deleted\n",
proc->pid, thread->pid,
node->debug_id,
(u64)node->ptr,
(u64)node->cookie);
rb_erase(&node->rb_node, &proc->nodes);
kfree(node);
binder_stats_deleted(BINDER_STAT_NODE);
} else {
binder_debug(BINDER_DEBUG_INTERNAL_REFS,
"%d:%d node %d u%016llx c%016llx state unchanged\n",
proc->pid, thread->pid,
node->debug_id,
(u64)node->ptr,
(u64)node->cookie);
}
}
} break;
case BINDER_WORK_DEAD_BINDER:
case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
struct binder_ref_death *death;
uint32_t cmd;
death = container_of(w, struct binder_ref_death, work);
if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
else
cmd = BR_DEAD_BINDER;
if (put_user(cmd, (uint32_t __user *)ptr))
return -EFAULT;
ptr += sizeof(uint32_t);
if (put_user(death->cookie,
(binder_uintptr_t __user *)ptr))
return -EFAULT;
ptr += sizeof(binder_uintptr_t);
binder_stat_br(proc, thread, cmd);
binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
"%d:%d %s %016llx\n",
proc->pid, thread->pid,
cmd == BR_DEAD_BINDER ?
"BR_DEAD_BINDER" :
"BR_CLEAR_DEATH_NOTIFICATION_DONE",
(u64)death->cookie);
if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
list_del(&w->entry);
kfree(death);
binder_stats_deleted(BINDER_STAT_DEATH);
} else
list_move(&w->entry, &proc->delivered_death);
if (cmd == BR_DEAD_BINDER)
goto done; /* DEAD_BINDER notifications can cause transactions */
} break;
}
if (!t)
continue;
BUG_ON(t->buffer == NULL);
if (t->buffer->target_node) {
struct binder_node *target_node = t->buffer->target_node;
tr.target.ptr = target_node->ptr;
tr.cookie = target_node->cookie;
t->saved_priority = task_nice(current);
if (t->priority < target_node->min_priority &&
!(t->flags & TF_ONE_WAY))
binder_set_nice(t->priority);
else if (!(t->flags & TF_ONE_WAY) ||
t->saved_priority > target_node->min_priority)
binder_set_nice(target_node->min_priority);
cmd = BR_TRANSACTION;
} else {
tr.target.ptr = 0;
tr.cookie = 0;
cmd = BR_REPLY;
}
tr.code = t->code;
tr.flags = t->flags;
tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
if (t->from) {
struct task_struct *sender = t->from->proc->tsk;
tr.sender_pid = task_tgid_nr_ns(sender,
task_active_pid_ns(current));
} else {
tr.sender_pid = 0;
}
tr.data_size = t->buffer->data_size;
tr.offsets_size = t->buffer->offsets_size;
tr.data.ptr.buffer = (binder_uintptr_t)(
(uintptr_t)t->buffer->data +
proc->user_buffer_offset);
tr.data.ptr.offsets = tr.data.ptr.buffer +
ALIGN(t->buffer->data_size,
sizeof(void *));
if (put_user(cmd, (uint32_t __user *)ptr))
return -EFAULT;
ptr += sizeof(uint32_t);
if (copy_to_user(ptr, &tr, sizeof(tr)))
return -EFAULT;
ptr += sizeof(tr);
trace_binder_transaction_received(t);
binder_stat_br(proc, thread, cmd);
binder_debug(BINDER_DEBUG_TRANSACTION,
"%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
proc->pid, thread->pid,
(cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
"BR_REPLY",
t->debug_id, t->from ? t->from->proc->pid : 0,
t->from ? t->from->pid : 0, cmd,
t->buffer->data_size, t->buffer->offsets_size,
(u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
list_del(&t->work.entry);
t->buffer->allow_user_free = 1;
if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
t->to_parent = thread->transaction_stack;
t->to_thread = thread;
thread->transaction_stack = t;
} else {
t->buffer->transaction = NULL;
kfree(t);
binder_stats_deleted(BINDER_STAT_TRANSACTION);
}
break;
}
done:
*consumed = ptr - buffer;
if (proc->requested_threads + proc->ready_threads == 0 &&
proc->requested_threads_started < proc->max_threads &&
(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
/*spawn a new thread if we leave this out */) {
proc->requested_threads++;
binder_debug(BINDER_DEBUG_THREADS,
"%d:%d BR_SPAWN_LOOPER\n",
proc->pid, thread->pid);
if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
return -EFAULT;
binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
}
return 0;
}
static void binder_release_work(struct list_head *list)
{
struct binder_work *w;
while (!list_empty(list)) {
w = list_first_entry(list, struct binder_work, entry);
list_del_init(&w->entry);
switch (w->type) {
case BINDER_WORK_TRANSACTION: {
struct binder_transaction *t;
t = container_of(w, struct binder_transaction, work);
if (t->buffer->target_node &&
!(t->flags & TF_ONE_WAY)) {
binder_send_failed_reply(t, BR_DEAD_REPLY);
} else {
binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
"undelivered transaction %d\n",
t->debug_id);
t->buffer->transaction = NULL;
kfree(t);
binder_stats_deleted(BINDER_STAT_TRANSACTION);
}
} break;
case BINDER_WORK_TRANSACTION_COMPLETE: {
binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
"undelivered TRANSACTION_COMPLETE\n");
kfree(w);
binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
} break;
case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
struct binder_ref_death *death;
death = container_of(w, struct binder_ref_death, work);
binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
"undelivered death notification, %016llx\n",
(u64)death->cookie);
kfree(death);
binder_stats_deleted(BINDER_STAT_DEATH);
} break;
default:
pr_err("unexpected work type, %d, not freed\n",
w->type);
break;
}
}
}
static struct binder_thread *binder_get_thread(struct binder_proc *proc)
{
struct binder_thread *thread = NULL;
struct rb_node *parent = NULL;
struct rb_node **p = &proc->threads.rb_node;
while (*p) {
parent = *p;
thread = rb_entry(parent, struct binder_thread, rb_node);
if (current->pid < thread->pid)
p = &(*p)->rb_left;
else if (current->pid > thread->pid)
p = &(*p)->rb_right;
else
break;
}
if (*p == NULL) {
thread = kzalloc(sizeof(*thread), GFP_KERNEL);
if (thread == NULL)
return NULL;
binder_stats_created(BINDER_STAT_THREAD);
thread->proc = proc;
thread->pid = current->pid;
init_waitqueue_head(&thread->wait);
INIT_LIST_HEAD(&thread->todo);
rb_link_node(&thread->rb_node, parent, p);
rb_insert_color(&thread->rb_node, &proc->threads);
thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
thread->return_error = BR_OK;
thread->return_error2 = BR_OK;
}
return thread;
}
static int binder_free_thread(struct binder_proc *proc,
struct binder_thread *thread)
{
struct binder_transaction *t;
struct binder_transaction *send_reply = NULL;
int active_transactions = 0;
rb_erase(&thread->rb_node, &proc->threads);
t = thread->transaction_stack;
if (t && t->to_thread == thread)
send_reply = t;
while (t) {
active_transactions++;
binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
"release %d:%d transaction %d %s, still active\n",
proc->pid, thread->pid,
t->debug_id,
(t->to_thread == thread) ? "in" : "out");
if (t->to_thread == thread) {
t->to_proc = NULL;
t->to_thread = NULL;
if (t->buffer) {
t->buffer->transaction = NULL;
t->buffer = NULL;
}
t = t->to_parent;
} else if (t->from == thread) {
t->from = NULL;
t = t->from_parent;
} else
BUG();
}
if (send_reply)
binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
binder_release_work(&thread->todo);
kfree(thread);
binder_stats_deleted(BINDER_STAT_THREAD);
return active_transactions;
}
static unsigned int binder_poll(struct file *filp,
struct poll_table_struct *wait)
{
struct binder_proc *proc = filp->private_data;
struct binder_thread *thread = NULL;
int wait_for_proc_work;
binder_lock(__func__);
thread = binder_get_thread(proc);
wait_for_proc_work = thread->transaction_stack == NULL &&
list_empty(&thread->todo) && thread->return_error == BR_OK;
binder_unlock(__func__);
if (wait_for_proc_work) {
if (binder_has_proc_work(proc, thread))
return POLLIN;
poll_wait(filp, &proc->wait, wait);
if (binder_has_proc_work(proc, thread))
return POLLIN;
} else {
if (binder_has_thread_work(thread))
return POLLIN;
poll_wait(filp, &thread->wait, wait);
if (binder_has_thread_work(thread))
return POLLIN;
}
return 0;
}
static int binder_ioctl_write_read(struct file *filp,
unsigned int cmd, unsigned long arg,
struct binder_thread *thread)
{
int ret = 0;
struct binder_proc *proc = filp->private_data;
unsigned int size = _IOC_SIZE(cmd);
void __user *ubuf = (void __user *)arg;
struct binder_write_read bwr;
if (size != sizeof(struct binder_write_read)) {
ret = -EINVAL;
goto out;
}
if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
ret = -EFAULT;
goto out;
}
binder_debug(BINDER_DEBUG_READ_WRITE,
"%d:%d write %lld at %016llx, read %lld at %016llx\n",
proc->pid, thread->pid,
(u64)bwr.write_size, (u64)bwr.write_buffer,
(u64)bwr.read_size, (u64)bwr.read_buffer);
if (bwr.write_size > 0) {
ret = binder_thread_write(proc, thread,
bwr.write_buffer,
bwr.write_size,
&bwr.write_consumed);
trace_binder_write_done(ret);
if (ret < 0) {
bwr.read_consumed = 0;
if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
ret = -EFAULT;
goto out;
}
}
if (bwr.read_size > 0) {
ret = binder_thread_read(proc, thread, bwr.read_buffer,
bwr.read_size,
&bwr.read_consumed,
filp->f_flags & O_NONBLOCK);
trace_binder_read_done(ret);
if (!list_empty(&proc->todo))
wake_up_interruptible(&proc->wait);
if (ret < 0) {
if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
ret = -EFAULT;
goto out;
}
}
binder_debug(BINDER_DEBUG_READ_WRITE,
"%d:%d wrote %lld of %lld, read return %lld of %lld\n",
proc->pid, thread->pid,
(u64)bwr.write_consumed, (u64)bwr.write_size,
(u64)bwr.read_consumed, (u64)bwr.read_size);
if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
ret = -EFAULT;
goto out;
}
out:
return ret;
}
static int binder_ioctl_set_ctx_mgr(struct file *filp)
{
int ret = 0;
struct binder_proc *proc = filp->private_data;
struct binder_context *context = proc->context;
kuid_t curr_euid = current_euid();
if (context->binder_context_mgr_node) {
pr_err("BINDER_SET_CONTEXT_MGR already set\n");
ret = -EBUSY;
goto out;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
ret = security_binder_set_context_mgr(proc->tsk);
if (ret < 0)
goto out;
#endif
if (uid_valid(context->binder_context_mgr_uid)) {
if (!uid_eq(context->binder_context_mgr_uid, curr_euid)) {
pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
from_kuid(&init_user_ns, curr_euid),
from_kuid(&init_user_ns,
context->binder_context_mgr_uid));
ret = -EPERM;
goto out;
}
} else {
context->binder_context_mgr_uid = curr_euid;
}
context->binder_context_mgr_node = binder_new_node(proc, 0, 0);
if (!context->binder_context_mgr_node) {
ret = -ENOMEM;
goto out;
}
context->binder_context_mgr_node->local_weak_refs++;
context->binder_context_mgr_node->local_strong_refs++;
context->binder_context_mgr_node->has_strong_ref = 1;
context->binder_context_mgr_node->has_weak_ref = 1;
out:
return ret;
}
static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
int ret;
struct binder_proc *proc = filp->private_data;
struct binder_thread *thread;
unsigned int size = _IOC_SIZE(cmd);
void __user *ubuf = (void __user *)arg;
/*pr_info("binder_ioctl: %d:%d %x %lx\n",
proc->pid, current->pid, cmd, arg);*/
trace_binder_ioctl(cmd, arg);
ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
if (ret)
goto err_unlocked;
binder_lock(__func__);
thread = binder_get_thread(proc);
if (thread == NULL) {
ret = -ENOMEM;
goto err;
}
switch (cmd) {
case BINDER_WRITE_READ:
ret = binder_ioctl_write_read(filp, cmd, arg, thread);
if (ret)
goto err;
break;
case BINDER_SET_MAX_THREADS:
if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
ret = -EINVAL;
goto err;
}
break;
case BINDER_SET_CONTEXT_MGR:
ret = binder_ioctl_set_ctx_mgr(filp);
if (ret)
goto err;
break;
case BINDER_THREAD_EXIT:
binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
proc->pid, thread->pid);
binder_free_thread(proc, thread);
thread = NULL;
break;
case BINDER_VERSION: {
struct binder_version __user *ver = ubuf;
if (size != sizeof(struct binder_version)) {
ret = -EINVAL;
goto err;
}
if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
&ver->protocol_version)) {
ret = -EINVAL;
goto err;
}
break;
}
default:
ret = -EINVAL;
goto err;
}
ret = 0;
err:
if (thread)
thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
binder_unlock(__func__);
wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
if (ret && ret != -ERESTARTSYS)
pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
err_unlocked:
trace_binder_ioctl_done(ret);
return ret;
}
static void binder_vma_open(struct vm_area_struct *vma)
{
struct binder_proc *proc = vma->vm_private_data;
binder_debug(BINDER_DEBUG_OPEN_CLOSE,
"%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
proc->pid, vma->vm_start, vma->vm_end,
(vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
(unsigned long)pgprot_val(vma->vm_page_prot));
}
static void binder_vma_close(struct vm_area_struct *vma)
{
struct binder_proc *proc = vma->vm_private_data;
binder_debug(BINDER_DEBUG_OPEN_CLOSE,
"%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
proc->pid, vma->vm_start, vma->vm_end,
(vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
(unsigned long)pgprot_val(vma->vm_page_prot));
proc->vma = NULL;
proc->vma_vm_mm = NULL;
binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
static int binder_vm_fault(struct vm_fault *vmf)
#else
static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
#endif
{
return VM_FAULT_SIGBUS;
}
static const struct vm_operations_struct binder_vm_ops = {
.open = binder_vma_open,
.close = binder_vma_close,
.fault = binder_vm_fault,
};
static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
{
int ret;
struct vm_struct *area;
struct binder_proc *proc = filp->private_data;
const char *failure_string;
struct binder_buffer *buffer;
if (proc->tsk != current)
return -EINVAL;
if ((vma->vm_end - vma->vm_start) > SZ_4M)
vma->vm_end = vma->vm_start + SZ_4M;
binder_debug(BINDER_DEBUG_OPEN_CLOSE,
"binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
proc->pid, vma->vm_start, vma->vm_end,
(vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
(unsigned long)pgprot_val(vma->vm_page_prot));
if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
ret = -EPERM;
failure_string = "bad vm_flags";
goto err_bad_arg;
}
vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
mutex_lock(&binder_mmap_lock);
if (proc->buffer) {
ret = -EBUSY;
failure_string = "already mapped";
goto err_already_mapped;
}
area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
if (area == NULL) {
ret = -ENOMEM;
failure_string = "get_vm_area";
goto err_get_vm_area_failed;
}
proc->buffer = area->addr;
proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
mutex_unlock(&binder_mmap_lock);
#ifdef CONFIG_CPU_CACHE_VIPT
if (cache_is_vipt_aliasing()) {
while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
vma->vm_start += PAGE_SIZE;
}
}
#endif
proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
if (proc->pages == NULL) {
ret = -ENOMEM;
failure_string = "alloc page array";
goto err_alloc_pages_failed;
}
proc->buffer_size = vma->vm_end - vma->vm_start;
vma->vm_ops = &binder_vm_ops;
vma->vm_private_data = proc;
if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
ret = -ENOMEM;
failure_string = "alloc small buf";
goto err_alloc_small_buf_failed;
}
buffer = proc->buffer;
INIT_LIST_HEAD(&proc->buffers);
list_add(&buffer->entry, &proc->buffers);
buffer->free = 1;
binder_insert_free_buffer(proc, buffer);
proc->free_async_space = proc->buffer_size / 2;
barrier();
proc->files = get_files_struct(current);
proc->vma = vma;
proc->vma_vm_mm = vma->vm_mm;
/*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
return 0;
err_alloc_small_buf_failed:
kfree(proc->pages);
proc->pages = NULL;
err_alloc_pages_failed:
mutex_lock(&binder_mmap_lock);
vfree(proc->buffer);
proc->buffer = NULL;
err_get_vm_area_failed:
err_already_mapped:
mutex_unlock(&binder_mmap_lock);
err_bad_arg:
pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
return ret;
}
static int binder_open(struct inode *nodp, struct file *filp)
{
int minor = iminor(nodp);
struct hlist_node *tmp;
struct binder_proc *proc;
struct binder_device *binder_dev;
binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
current->group_leader->pid, current->pid);
proc = kzalloc(sizeof(*proc), GFP_KERNEL);
if (proc == NULL)
return -ENOMEM;
get_task_struct(current->group_leader);
proc->tsk = current->group_leader;
INIT_LIST_HEAD(&proc->todo);
init_waitqueue_head(&proc->wait);
proc->default_priority = task_nice(current);
mutex_lock(&binder_devices_mtx);
hlist_for_each_entry_safe(binder_dev, tmp, &binder_devices, hlist) {
if (MINOR(binder_dev->cdev.dev) == minor)
break;
binder_dev = NULL;
}
mutex_unlock(&binder_devices_mtx);
if (!binder_dev)
BUG();
filp->private_data = &binder_dev->class_dev;
proc->context = &binder_dev->context;
binder_lock(__func__);
binder_stats_created(BINDER_STAT_PROC);
hlist_add_head(&proc->proc_node, &binder_procs);
proc->pid = current->group_leader->pid;
INIT_LIST_HEAD(&proc->delivered_death);
filp->private_data = proc;
binder_unlock(__func__);
if (binder_debugfs_dir_entry_proc) {
char strbuf[11];
snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
/*
* proc debug entries are shared between contexts, so
* this will fail if the process tries to open the driver
* again with a different context. The priting code will
* anyway print all contexts that a given PID has, so this
* is not a problem.
*/
proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
binder_debugfs_dir_entry_proc,
(void *)(unsigned long)proc->pid,
&binder_proc_fops);
}
return 0;
}
static int binder_flush(struct file *filp, fl_owner_t id)
{
struct binder_proc *proc = filp->private_data;
binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
return 0;
}
static void binder_deferred_flush(struct binder_proc *proc)
{
struct rb_node *n;
int wake_count = 0;
for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
wake_up_interruptible(&thread->wait);
wake_count++;
}
}
wake_up_interruptible_all(&proc->wait);
binder_debug(BINDER_DEBUG_OPEN_CLOSE,
"binder_flush: %d woke %d threads\n", proc->pid,
wake_count);
}
static int binder_release(struct inode *nodp, struct file *filp)
{
struct binder_proc *proc = filp->private_data;
debugfs_remove(proc->debugfs_entry);
binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
return 0;
}
static int binder_node_release(struct binder_node *node, int refs)
{
struct binder_ref *ref;
int death = 0;
list_del_init(&node->work.entry);
binder_release_work(&node->async_todo);
if (hlist_empty(&node->refs)) {
kfree(node);
binder_stats_deleted(BINDER_STAT_NODE);
return refs;
}
node->proc = NULL;
node->local_strong_refs = 0;
node->local_weak_refs = 0;
hlist_add_head(&node->dead_node, &binder_dead_nodes);
hlist_for_each_entry(ref, &node->refs, node_entry) {
refs++;
if (!ref->death)
continue;
death++;
if (list_empty(&ref->death->work.entry)) {
ref->death->work.type = BINDER_WORK_DEAD_BINDER;
list_add_tail(&ref->death->work.entry,
&ref->proc->todo);
wake_up_interruptible(&ref->proc->wait);
} else
BUG();
}
binder_debug(BINDER_DEBUG_DEAD_BINDER,
"node %d now dead, refs %d, death %d\n",
node->debug_id, refs, death);
return refs;
}
static void binder_deferred_release(struct binder_proc *proc)
{
struct binder_transaction *t;
struct binder_context *context = proc->context;
struct rb_node *n;
int threads, nodes, incoming_refs, outgoing_refs, buffers,
active_transactions, page_count;
BUG_ON(proc->vma);
BUG_ON(proc->files);
hlist_del(&proc->proc_node);
if (context->binder_context_mgr_node &&
context->binder_context_mgr_node->proc == proc) {
binder_debug(BINDER_DEBUG_DEAD_BINDER,
"%s: %d context_mgr_node gone\n",
__func__, proc->pid);
context->binder_context_mgr_node = NULL;
}
threads = 0;
active_transactions = 0;
while ((n = rb_first(&proc->threads))) {
struct binder_thread *thread;
thread = rb_entry(n, struct binder_thread, rb_node);
threads++;
active_transactions += binder_free_thread(proc, thread);
}
nodes = 0;
incoming_refs = 0;
while ((n = rb_first(&proc->nodes))) {
struct binder_node *node;
node = rb_entry(n, struct binder_node, rb_node);
nodes++;
rb_erase(&node->rb_node, &proc->nodes);
incoming_refs = binder_node_release(node, incoming_refs);
}
outgoing_refs = 0;
while ((n = rb_first(&proc->refs_by_desc))) {
struct binder_ref *ref;
ref = rb_entry(n, struct binder_ref, rb_node_desc);
outgoing_refs++;
binder_delete_ref(ref);
}
binder_release_work(&proc->todo);
binder_release_work(&proc->delivered_death);
buffers = 0;
while ((n = rb_first(&proc->allocated_buffers))) {
struct binder_buffer *buffer;
buffer = rb_entry(n, struct binder_buffer, rb_node);
t = buffer->transaction;
if (t) {
t->buffer = NULL;
buffer->transaction = NULL;
pr_err("release proc %d, transaction %d, not freed\n",
proc->pid, t->debug_id);
/*BUG();*/
}
binder_free_buf(proc, buffer);
buffers++;
}
binder_stats_deleted(BINDER_STAT_PROC);
page_count = 0;
if (proc->pages) {
int i;
for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
void *page_addr;
if (!proc->pages[i])
continue;
page_addr = proc->buffer + i * PAGE_SIZE;
binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%s: %d: page %d at %p not freed\n",
__func__, proc->pid, i, page_addr);
unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
__free_page(proc->pages[i]);
page_count++;
}
kfree(proc->pages);
vfree(proc->buffer);
}
put_task_struct(proc->tsk);
binder_debug(BINDER_DEBUG_OPEN_CLOSE,
"%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
__func__, proc->pid, threads, nodes, incoming_refs,
outgoing_refs, active_transactions, buffers, page_count);
kfree(proc);
}
static void binder_deferred_func(struct work_struct *work)
{
struct binder_proc *proc;
struct files_struct *files;
int defer;
do {
binder_lock(__func__);
mutex_lock(&binder_deferred_lock);
if (!hlist_empty(&binder_deferred_list)) {
proc = hlist_entry(binder_deferred_list.first,
struct binder_proc, deferred_work_node);
hlist_del_init(&proc->deferred_work_node);
defer = proc->deferred_work;
proc->deferred_work = 0;
} else {
proc = NULL;
defer = 0;
}
mutex_unlock(&binder_deferred_lock);
files = NULL;
if (defer & BINDER_DEFERRED_PUT_FILES) {
files = proc->files;
if (files)
proc->files = NULL;
}
if (defer & BINDER_DEFERRED_FLUSH)
binder_deferred_flush(proc);
if (defer & BINDER_DEFERRED_RELEASE)
binder_deferred_release(proc); /* frees proc */
binder_unlock(__func__);
if (files)
put_files_struct(files);
} while (proc);
}
static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
static void
binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
{
mutex_lock(&binder_deferred_lock);
proc->deferred_work |= defer;
if (hlist_unhashed(&proc->deferred_work_node)) {
hlist_add_head(&proc->deferred_work_node,
&binder_deferred_list);
schedule_work(&binder_deferred_work);
}
mutex_unlock(&binder_deferred_lock);
}
static void print_binder_transaction(struct seq_file *m, const char *prefix,
struct binder_transaction *t)
{
seq_printf(m,
"%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
prefix, t->debug_id, t,
t->from ? t->from->proc->pid : 0,
t->from ? t->from->pid : 0,
t->to_proc ? t->to_proc->pid : 0,
t->to_thread ? t->to_thread->pid : 0,
t->code, t->flags, t->priority, t->need_reply);
if (t->buffer == NULL) {
seq_puts(m, " buffer free\n");
return;
}
if (t->buffer->target_node)
seq_printf(m, " node %d",
t->buffer->target_node->debug_id);
seq_printf(m, " size %zd:%zd data %p\n",
t->buffer->data_size, t->buffer->offsets_size,
t->buffer->data);
}
static void print_binder_buffer(struct seq_file *m, const char *prefix,
struct binder_buffer *buffer)
{
seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
prefix, buffer->debug_id, buffer->data,
buffer->data_size, buffer->offsets_size,
buffer->transaction ? "active" : "delivered");
}
static void print_binder_work(struct seq_file *m, const char *prefix,
const char *transaction_prefix,
struct binder_work *w)
{
struct binder_node *node;
struct binder_transaction *t;
switch (w->type) {
case BINDER_WORK_TRANSACTION:
t = container_of(w, struct binder_transaction, work);
print_binder_transaction(m, transaction_prefix, t);
break;
case BINDER_WORK_TRANSACTION_COMPLETE:
seq_printf(m, "%stransaction complete\n", prefix);
break;
case BINDER_WORK_NODE:
node = container_of(w, struct binder_node, work);
seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
prefix, node->debug_id,
(u64)node->ptr, (u64)node->cookie);
break;
case BINDER_WORK_DEAD_BINDER:
seq_printf(m, "%shas dead binder\n", prefix);
break;
case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
seq_printf(m, "%shas cleared dead binder\n", prefix);
break;
case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
seq_printf(m, "%shas cleared death notification\n", prefix);
break;
default:
seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
break;
}
}
static void print_binder_thread(struct seq_file *m,
struct binder_thread *thread,
int print_always)
{
struct binder_transaction *t;
struct binder_work *w;
size_t start_pos = m->count;
size_t header_pos;
seq_printf(m, " thread %d: l %02x\n", thread->pid, thread->looper);
header_pos = m->count;
t = thread->transaction_stack;
while (t) {
if (t->from == thread) {
print_binder_transaction(m,
" outgoing transaction", t);
t = t->from_parent;
} else if (t->to_thread == thread) {
print_binder_transaction(m,
" incoming transaction", t);
t = t->to_parent;
} else {
print_binder_transaction(m, " bad transaction", t);
t = NULL;
}
}
list_for_each_entry(w, &thread->todo, entry) {
print_binder_work(m, " ", " pending transaction", w);
}
if (!print_always && m->count == header_pos)
m->count = start_pos;
}
static void print_binder_node(struct seq_file *m, struct binder_node *node)
{
struct binder_ref *ref;
struct binder_work *w;
int count;
count = 0;
hlist_for_each_entry(ref, &node->refs, node_entry)
count++;
seq_printf(m, " node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
node->debug_id, (u64)node->ptr, (u64)node->cookie,
node->has_strong_ref, node->has_weak_ref,
node->local_strong_refs, node->local_weak_refs,
node->internal_strong_refs, count);
if (count) {
seq_puts(m, " proc");
hlist_for_each_entry(ref, &node->refs, node_entry)
seq_printf(m, " %d", ref->proc->pid);
}
seq_puts(m, "\n");
list_for_each_entry(w, &node->async_todo, entry)
print_binder_work(m, " ",
" pending async transaction", w);
}
static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
{
seq_printf(m, " ref %d: desc %d %snode %d s %d w %d d %p\n",
ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
ref->node->debug_id, ref->strong, ref->weak, ref->death);
}
static void print_binder_proc(struct seq_file *m,
struct binder_proc *proc, int print_all)
{
struct binder_work *w;
struct rb_node *n;
size_t start_pos = m->count;
size_t header_pos;
seq_printf(m, "proc %d\n", proc->pid);
seq_printf(m, "context %s\n", proc->context->name);
header_pos = m->count;
for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
print_binder_thread(m, rb_entry(n, struct binder_thread,
rb_node), print_all);
for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
struct binder_node *node = rb_entry(n, struct binder_node,
rb_node);
if (print_all || node->has_async_transaction)
print_binder_node(m, node);
}
if (print_all) {
for (n = rb_first(&proc->refs_by_desc);
n != NULL;
n = rb_next(n))
print_binder_ref(m, rb_entry(n, struct binder_ref,
rb_node_desc));
}
for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
print_binder_buffer(m, " buffer",
rb_entry(n, struct binder_buffer, rb_node));
list_for_each_entry(w, &proc->todo, entry)
print_binder_work(m, " ", " pending transaction", w);
list_for_each_entry(w, &proc->delivered_death, entry) {
seq_puts(m, " has delivered dead binder\n");
break;
}
if (!print_all && m->count == header_pos)
m->count = start_pos;
}
static const char * const binder_return_strings[] = {
"BR_ERROR",
"BR_OK",
"BR_TRANSACTION",
"BR_REPLY",
"BR_ACQUIRE_RESULT",
"BR_DEAD_REPLY",
"BR_TRANSACTION_COMPLETE",
"BR_INCREFS",
"BR_ACQUIRE",
"BR_RELEASE",
"BR_DECREFS",
"BR_ATTEMPT_ACQUIRE",
"BR_NOOP",
"BR_SPAWN_LOOPER",
"BR_FINISHED",
"BR_DEAD_BINDER",
"BR_CLEAR_DEATH_NOTIFICATION_DONE",
"BR_FAILED_REPLY"
};
static const char * const binder_command_strings[] = {
"BC_TRANSACTION",
"BC_REPLY",
"BC_ACQUIRE_RESULT",
"BC_FREE_BUFFER",
"BC_INCREFS",
"BC_ACQUIRE",
"BC_RELEASE",
"BC_DECREFS",
"BC_INCREFS_DONE",
"BC_ACQUIRE_DONE",
"BC_ATTEMPT_ACQUIRE",
"BC_REGISTER_LOOPER",
"BC_ENTER_LOOPER",
"BC_EXIT_LOOPER",
"BC_REQUEST_DEATH_NOTIFICATION",
"BC_CLEAR_DEATH_NOTIFICATION",
"BC_DEAD_BINDER_DONE",
"BC_TRANSACTION_SG",
"BC_REPLY_SG",
};
static const char * const binder_objstat_strings[] = {
"proc",
"thread",
"node",
"ref",
"death",
"transaction",
"transaction_complete"
};
static void print_binder_stats(struct seq_file *m, const char *prefix,
struct binder_stats *stats)
{
int i;
BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
ARRAY_SIZE(binder_command_strings));
for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
if (stats->bc[i])
seq_printf(m, "%s%s: %d\n", prefix,
binder_command_strings[i], stats->bc[i]);
}
BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
ARRAY_SIZE(binder_return_strings));
for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
if (stats->br[i])
seq_printf(m, "%s%s: %d\n", prefix,
binder_return_strings[i], stats->br[i]);
}
BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
ARRAY_SIZE(binder_objstat_strings));
BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
ARRAY_SIZE(stats->obj_deleted));
for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
if (stats->obj_created[i] || stats->obj_deleted[i])
seq_printf(m, "%s%s: active %d total %d\n", prefix,
binder_objstat_strings[i],
stats->obj_created[i] - stats->obj_deleted[i],
stats->obj_created[i]);
}
}
static void print_binder_proc_stats(struct seq_file *m,
struct binder_proc *proc)
{
struct binder_work *w;
struct rb_node *n;
int count, strong, weak;
seq_printf(m, "proc %d\n", proc->pid);
seq_printf(m, "context %s\n", proc->context->name);
count = 0;
for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
count++;
seq_printf(m, " threads: %d\n", count);
seq_printf(m, " requested threads: %d+%d/%d\n"
" ready threads %d\n"
" free async space %zd\n", proc->requested_threads,
proc->requested_threads_started, proc->max_threads,
proc->ready_threads, proc->free_async_space);
count = 0;
for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
count++;
seq_printf(m, " nodes: %d\n", count);
count = 0;
strong = 0;
weak = 0;
for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
struct binder_ref *ref = rb_entry(n, struct binder_ref,
rb_node_desc);
count++;
strong += ref->strong;
weak += ref->weak;
}
seq_printf(m, " refs: %d s %d w %d\n", count, strong, weak);
count = 0;
for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
count++;
seq_printf(m, " buffers: %d\n", count);
count = 0;
list_for_each_entry(w, &proc->todo, entry) {
switch (w->type) {
case BINDER_WORK_TRANSACTION:
count++;
break;
default:
break;
}
}
seq_printf(m, " pending transactions: %d\n", count);
print_binder_stats(m, " ", &proc->stats);
}
static int binder_state_show(struct seq_file *m, void *unused)
{
struct binder_proc *proc;
struct binder_node *node;
int do_lock = !binder_debug_no_lock;
if (do_lock)
binder_lock(__func__);
seq_puts(m, "binder state:\n");
if (!hlist_empty(&binder_dead_nodes))
seq_puts(m, "dead nodes:\n");
hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
print_binder_node(m, node);
hlist_for_each_entry(proc, &binder_procs, proc_node)
print_binder_proc(m, proc, 1);
if (do_lock)
binder_unlock(__func__);
return 0;
}
static int binder_stats_show(struct seq_file *m, void *unused)
{
struct binder_proc *proc;
int do_lock = !binder_debug_no_lock;
if (do_lock)
binder_lock(__func__);
seq_puts(m, "binder stats:\n");
print_binder_stats(m, "", &binder_stats);
hlist_for_each_entry(proc, &binder_procs, proc_node)
print_binder_proc_stats(m, proc);
if (do_lock)
binder_unlock(__func__);
return 0;
}
static int binder_transactions_show(struct seq_file *m, void *unused)
{
struct binder_proc *proc;
int do_lock = !binder_debug_no_lock;
if (do_lock)
binder_lock(__func__);
seq_puts(m, "binder transactions:\n");
hlist_for_each_entry(proc, &binder_procs, proc_node)
print_binder_proc(m, proc, 0);
if (do_lock)
binder_unlock(__func__);
return 0;
}
static int binder_proc_show(struct seq_file *m, void *unused)
{
struct binder_proc *itr;
int pid = (unsigned long)m->private;
int do_lock = !binder_debug_no_lock;
if (do_lock)
binder_lock(__func__);
hlist_for_each_entry(itr, &binder_procs, proc_node) {
if (itr->pid == pid) {
seq_puts(m, "binder proc state:\n");
print_binder_proc(m, itr, 1);
}
}
if (do_lock)
binder_unlock(__func__);
return 0;
}
static void print_binder_transaction_log_entry(struct seq_file *m,
struct binder_transaction_log_entry *e)
{
seq_printf(m,
"%d: %s from %d:%d to %d:%d context %s node %d handle %d size %d:%d\n",
e->debug_id, (e->call_type == 2) ? "reply" :
((e->call_type == 1) ? "async" : "call "), e->from_proc,
e->from_thread, e->to_proc, e->to_thread, e->context_name,
e->to_node, e->target_handle, e->data_size, e->offsets_size);
}
static int binder_transaction_log_show(struct seq_file *m, void *unused)
{
struct binder_transaction_log *log = m->private;
int i;
if (log->full) {
for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
print_binder_transaction_log_entry(m, &log->entry[i]);
}
for (i = 0; i < log->next; i++)
print_binder_transaction_log_entry(m, &log->entry[i]);
return 0;
}
static const struct file_operations binder_fops = {
.owner = THIS_MODULE,
.poll = binder_poll,
.unlocked_ioctl = binder_ioctl,
.compat_ioctl = binder_ioctl,
.mmap = binder_mmap,
.open = binder_open,
.flush = binder_flush,
.release = binder_release,
};
BINDER_DEBUG_ENTRY(state);
BINDER_DEBUG_ENTRY(stats);
BINDER_DEBUG_ENTRY(transactions);
BINDER_DEBUG_ENTRY(transaction_log);
static struct class *binder_class;
static void binder_device_release(struct device *dev)
{
}
static int __init init_binder_device(int idx)
{
int ret;
char *name;
dev_t devnr;
struct binder_device *binder_device;
/* strlen("binder")
* +
* maximum length of 64 bit int as string
*/
char numstr[6 + 21] = "binder";
binder_device = kzalloc(sizeof(*binder_device), GFP_KERNEL);
if (!binder_device)
return -ENOMEM;
cdev_init(&binder_device->cdev, &binder_fops);
binder_device->cdev.owner = THIS_MODULE;
devnr = MKDEV(BINDER_DKMS_MAJOR, idx);
ret = cdev_add(&binder_device->cdev, devnr, 1);
if (ret) {
kfree(binder_device);
return ret;
}
if (binder_devices_param > 1)
ret = snprintf(numstr, sizeof(numstr), "binder%d", idx);
if (ret < 0 || (size_t)ret >= sizeof(numstr)) {
cdev_del(&binder_device->cdev);
kfree(binder_device);
return -EIO;
}
name = kzalloc(strlen(numstr) + 1, GFP_KERNEL);
if (!name) {
cdev_del(&binder_device->cdev);
kfree(binder_device);
return -ENOMEM;
}
strcpy(name, numstr);
binder_device->context.name = name;
binder_device->context.binder_context_mgr_uid = INVALID_UID;
binder_device->class_dev.devt = binder_device->cdev.dev;
binder_device->class_dev.class = binder_class;
binder_device->class_dev.release = binder_device_release;
dev_set_name(&binder_device->class_dev, "%s", name);
ret = device_register(&binder_device->class_dev);
if (ret) {
cdev_del(&binder_device->cdev);
kfree(binder_device);
kfree(name);
return ret;
}
mutex_lock(&binder_devices_mtx);
hlist_add_head(&binder_device->hlist, &binder_devices);
mutex_unlock(&binder_devices_mtx);
return 0;
}
static int __init binder_init(void)
{
int i, ret;
struct binder_device *device;
struct hlist_node *tmp;
if (binder_devices_param <= 0 ||
binder_devices_param > BINDER_DKMS_MAX_MINOR)
return -EINVAL;
binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
if (binder_debugfs_dir_entry_root)
binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
binder_debugfs_dir_entry_root);
if (binder_debugfs_dir_entry_root) {
debugfs_create_file("state",
S_IRUGO,
binder_debugfs_dir_entry_root,
NULL,
&binder_state_fops);
debugfs_create_file("stats",
S_IRUGO,
binder_debugfs_dir_entry_root,
NULL,
&binder_stats_fops);
debugfs_create_file("transactions",
S_IRUGO,
binder_debugfs_dir_entry_root,
NULL,
&binder_transactions_fops);
debugfs_create_file("transaction_log",
S_IRUGO,
binder_debugfs_dir_entry_root,
&binder_transaction_log,
&binder_transaction_log_fops);
debugfs_create_file("failed_transaction_log",
S_IRUGO,
binder_debugfs_dir_entry_root,
&binder_transaction_log_failed,
&binder_transaction_log_fops);
}
ret = register_chrdev_region(MKDEV(BINDER_DKMS_MAJOR, 0),
BINDER_DKMS_MAX_MINOR, "binder");
if (ret)
goto on_error_remove_debugfs;
binder_class = class_create(THIS_MODULE, "binder");
if (IS_ERR(binder_class))
goto on_error_unregister_chrdev_region;
for (i = 0; i < binder_devices_param; i++) {
ret = init_binder_device(i);
if (ret)
goto err_init_binder_device_failed;
}
return ret;
err_init_binder_device_failed:
mutex_lock(&binder_devices_mtx);
hlist_for_each_entry_safe(device, tmp, &binder_devices, hlist) {
cdev_del(&device->cdev);
device_unregister(&device->class_dev);
kfree(device->context.name);
hlist_del(&device->hlist);
kfree(device);
}
mutex_unlock(&binder_devices_mtx);
class_destroy(binder_class);
on_error_unregister_chrdev_region:
unregister_chrdev_region(MKDEV(BINDER_DKMS_MAJOR, 0),
BINDER_DKMS_MAX_MINOR);
on_error_remove_debugfs:
debugfs_remove_recursive(binder_debugfs_dir_entry_root);
return -1;
}
static void __exit binder_exit(void)
{
struct binder_device *device;
struct hlist_node *tmp;
mutex_lock(&binder_devices_mtx);
hlist_for_each_entry_safe(device, tmp, &binder_devices, hlist) {
cdev_del(&device->cdev);
device_unregister(&device->class_dev);
kfree(device->context.name);
hlist_del(&device->hlist);
kfree(device);
}
mutex_unlock(&binder_devices_mtx);
class_destroy(binder_class);
unregister_chrdev_region(MKDEV(BINDER_DKMS_MAJOR, 0),
BINDER_DKMS_MAX_MINOR);
debugfs_remove_recursive(binder_debugfs_dir_entry_root);
}
module_init(binder_init);
module_exit(binder_exit);
#define CREATE_TRACE_POINTS
#include "binder_trace.h"
MODULE_LICENSE("GPL v2");
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