blob: f26286e3713ec73388c92ecaa579abc361a617a5 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/* binder.c
*
* Android IPC Subsystem
*
* Copyright (C) 2007-2008 Google, Inc.
*/
/*
* Locking overview
*
* There are 3 main spinlocks which must be acquired in the
* order shown:
*
* 1) proc->outer_lock : protects binder_ref
* binder_proc_lock() and binder_proc_unlock() are
* used to acq/rel.
* 2) node->lock : protects most fields of binder_node.
* binder_node_lock() and binder_node_unlock() are
* used to acq/rel
* 3) proc->inner_lock : protects the thread and node lists
* (proc->threads, proc->waiting_threads, proc->nodes)
* and all todo lists associated with the binder_proc
* (proc->todo, thread->todo, proc->delivered_death and
* node->async_todo), as well as thread->transaction_stack
* binder_inner_proc_lock() and binder_inner_proc_unlock()
* are used to acq/rel
*
* Any lock under procA must never be nested under any lock at the same
* level or below on procB.
*
* Functions that require a lock held on entry indicate which lock
* in the suffix of the function name:
*
* foo_olocked() : requires node->outer_lock
* foo_nlocked() : requires node->lock
* foo_ilocked() : requires proc->inner_lock
* foo_oilocked(): requires proc->outer_lock and proc->inner_lock
* foo_nilocked(): requires node->lock and proc->inner_lock
* ...
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/fdtable.h>
#include <linux/file.h>
#include <linux/freezer.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/miscdevice.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/sched/signal.h>
#include <linux/sched/mm.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/pid_namespace.h>
#include <linux/security.h>
#include <linux/spinlock.h>
#include <linux/ratelimit.h>
#include <linux/syscalls.h>
#include <linux/task_work.h>
#include <linux/sizes.h>
#include <linux/ktime.h>
#include <uapi/linux/android/binder.h>
#include <linux/cacheflush.h>
#include "binder_internal.h"
#include "binder_trace.h"
static HLIST_HEAD(binder_deferred_list);
static DEFINE_MUTEX(binder_deferred_lock);
static HLIST_HEAD(binder_devices);
static HLIST_HEAD(binder_procs);
static DEFINE_MUTEX(binder_procs_lock);
static HLIST_HEAD(binder_dead_nodes);
static DEFINE_SPINLOCK(binder_dead_nodes_lock);
static struct dentry *binder_debugfs_dir_entry_root;
static struct dentry *binder_debugfs_dir_entry_proc;
static atomic_t binder_last_id;
static int proc_show(struct seq_file *m, void *unused);
DEFINE_SHOW_ATTRIBUTE(proc);
#define FORBIDDEN_MMAP_FLAGS (VM_WRITE)
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_PRIORITY_CAP = 1U << 13,
BINDER_DEBUG_SPINLOCKS = 1U << 14,
};
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, 0644);
char *binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES;
module_param_named(devices, binder_devices_param, charp, 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,
const struct kernel_param *kp)
{
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, 0644);
static __printf(2, 3) void binder_debug(int mask, const char *format, ...)
{
struct va_format vaf;
va_list args;
if (binder_debug_mask & mask) {
va_start(args, format);
vaf.va = &args;
vaf.fmt = format;
pr_info_ratelimited("%pV", &vaf);
va_end(args);
}
}
#define binder_txn_error(x...) \
binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, x)
static __printf(1, 2) void binder_user_error(const char *format, ...)
{
struct va_format vaf;
va_list args;
if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) {
va_start(args, format);
vaf.va = &args;
vaf.fmt = format;
pr_info_ratelimited("%pV", &vaf);
va_end(args);
}
if (binder_stop_on_user_error)
binder_stop_on_user_error = 2;
}
#define binder_set_extended_error(ee, _id, _command, _param) \
do { \
(ee)->id = _id; \
(ee)->command = _command; \
(ee)->param = _param; \
} 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)
static struct binder_stats binder_stats;
static inline void binder_stats_deleted(enum binder_stat_types type)
{
atomic_inc(&binder_stats.obj_deleted[type]);
}
static inline void binder_stats_created(enum binder_stat_types type)
{
atomic_inc(&binder_stats.obj_created[type]);
}
struct binder_transaction_log_entry {
int debug_id;
int debug_id_done;
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;
int return_error_line;
uint32_t return_error;
uint32_t return_error_param;
char context_name[BINDERFS_MAX_NAME + 1];
};
struct binder_transaction_log {
atomic_t cur;
bool 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;
unsigned int cur = atomic_inc_return(&log->cur);
if (cur >= ARRAY_SIZE(log->entry))
log->full = true;
e = &log->entry[cur % ARRAY_SIZE(log->entry)];
WRITE_ONCE(e->debug_id_done, 0);
/*
* write-barrier to synchronize access to e->debug_id_done.
* We make sure the initialized 0 value is seen before
* memset() other fields are zeroed by memset.
*/
smp_wmb();
memset(e, 0, sizeof(*e));
return e;
}
enum binder_deferred_state {
BINDER_DEFERRED_FLUSH = 0x01,
BINDER_DEFERRED_RELEASE = 0x02,
};
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_POLL = 0x20,
};
/**
* binder_proc_lock() - Acquire outer lock for given binder_proc
* @proc: struct binder_proc to acquire
*
* Acquires proc->outer_lock. Used to protect binder_ref
* structures associated with the given proc.
*/
#define binder_proc_lock(proc) _binder_proc_lock(proc, __LINE__)
static void
_binder_proc_lock(struct binder_proc *proc, int line)
__acquires(&proc->outer_lock)
{
binder_debug(BINDER_DEBUG_SPINLOCKS,
"%s: line=%d\n", __func__, line);
spin_lock(&proc->outer_lock);
}
/**
* binder_proc_unlock() - Release spinlock for given binder_proc
* @proc: struct binder_proc to acquire
*
* Release lock acquired via binder_proc_lock()
*/
#define binder_proc_unlock(proc) _binder_proc_unlock(proc, __LINE__)
static void
_binder_proc_unlock(struct binder_proc *proc, int line)
__releases(&proc->outer_lock)
{
binder_debug(BINDER_DEBUG_SPINLOCKS,
"%s: line=%d\n", __func__, line);
spin_unlock(&proc->outer_lock);
}
/**
* binder_inner_proc_lock() - Acquire inner lock for given binder_proc
* @proc: struct binder_proc to acquire
*
* Acquires proc->inner_lock. Used to protect todo lists
*/
#define binder_inner_proc_lock(proc) _binder_inner_proc_lock(proc, __LINE__)
static void
_binder_inner_proc_lock(struct binder_proc *proc, int line)
__acquires(&proc->inner_lock)
{
binder_debug(BINDER_DEBUG_SPINLOCKS,
"%s: line=%d\n", __func__, line);
spin_lock(&proc->inner_lock);
}
/**
* binder_inner_proc_unlock() - Release inner lock for given binder_proc
* @proc: struct binder_proc to acquire
*
* Release lock acquired via binder_inner_proc_lock()
*/
#define binder_inner_proc_unlock(proc) _binder_inner_proc_unlock(proc, __LINE__)
static void
_binder_inner_proc_unlock(struct binder_proc *proc, int line)
__releases(&proc->inner_lock)
{
binder_debug(BINDER_DEBUG_SPINLOCKS,
"%s: line=%d\n", __func__, line);
spin_unlock(&proc->inner_lock);
}
/**
* binder_node_lock() - Acquire spinlock for given binder_node
* @node: struct binder_node to acquire
*
* Acquires node->lock. Used to protect binder_node fields
*/
#define binder_node_lock(node) _binder_node_lock(node, __LINE__)
static void
_binder_node_lock(struct binder_node *node, int line)
__acquires(&node->lock)
{
binder_debug(BINDER_DEBUG_SPINLOCKS,
"%s: line=%d\n", __func__, line);
spin_lock(&node->lock);
}
/**
* binder_node_unlock() - Release spinlock for given binder_proc
* @node: struct binder_node to acquire
*
* Release lock acquired via binder_node_lock()
*/
#define binder_node_unlock(node) _binder_node_unlock(node, __LINE__)
static void
_binder_node_unlock(struct binder_node *node, int line)
__releases(&node->lock)
{
binder_debug(BINDER_DEBUG_SPINLOCKS,
"%s: line=%d\n", __func__, line);
spin_unlock(&node->lock);
}
/**
* binder_node_inner_lock() - Acquire node and inner locks
* @node: struct binder_node to acquire
*
* Acquires node->lock. If node->proc also acquires
* proc->inner_lock. Used to protect binder_node fields
*/
#define binder_node_inner_lock(node) _binder_node_inner_lock(node, __LINE__)
static void
_binder_node_inner_lock(struct binder_node *node, int line)
__acquires(&node->lock) __acquires(&node->proc->inner_lock)
{
binder_debug(BINDER_DEBUG_SPINLOCKS,
"%s: line=%d\n", __func__, line);
spin_lock(&node->lock);
if (node->proc)
binder_inner_proc_lock(node->proc);
else
/* annotation for sparse */
__acquire(&node->proc->inner_lock);
}
/**
* binder_node_inner_unlock() - Release node and inner locks
* @node: struct binder_node to acquire
*
* Release lock acquired via binder_node_lock()
*/
#define binder_node_inner_unlock(node) _binder_node_inner_unlock(node, __LINE__)
static void
_binder_node_inner_unlock(struct binder_node *node, int line)
__releases(&node->lock) __releases(&node->proc->inner_lock)
{
struct binder_proc *proc = node->proc;
binder_debug(BINDER_DEBUG_SPINLOCKS,
"%s: line=%d\n", __func__, line);
if (proc)
binder_inner_proc_unlock(proc);
else
/* annotation for sparse */
__release(&node->proc->inner_lock);
spin_unlock(&node->lock);
}
static bool binder_worklist_empty_ilocked(struct list_head *list)
{
return list_empty(list);
}
/**
* binder_worklist_empty() - Check if no items on the work list
* @proc: binder_proc associated with list
* @list: list to check
*
* Return: true if there are no items on list, else false
*/
static bool binder_worklist_empty(struct binder_proc *proc,
struct list_head *list)
{
bool ret;
binder_inner_proc_lock(proc);
ret = binder_worklist_empty_ilocked(list);
binder_inner_proc_unlock(proc);
return ret;
}
/**
* binder_enqueue_work_ilocked() - Add an item to the work list
* @work: struct binder_work to add to list
* @target_list: list to add work to
*
* Adds the work to the specified list. Asserts that work
* is not already on a list.
*
* Requires the proc->inner_lock to be held.
*/
static void
binder_enqueue_work_ilocked(struct binder_work *work,
struct list_head *target_list)
{
BUG_ON(target_list == NULL);
BUG_ON(work->entry.next && !list_empty(&work->entry));
list_add_tail(&work->entry, target_list);
}
/**
* binder_enqueue_deferred_thread_work_ilocked() - Add deferred thread work
* @thread: thread to queue work to
* @work: struct binder_work to add to list
*
* Adds the work to the todo list of the thread. Doesn't set the process_todo
* flag, which means that (if it wasn't already set) the thread will go to
* sleep without handling this work when it calls read.
*
* Requires the proc->inner_lock to be held.
*/
static void
binder_enqueue_deferred_thread_work_ilocked(struct binder_thread *thread,
struct binder_work *work)
{
WARN_ON(!list_empty(&thread->waiting_thread_node));
binder_enqueue_work_ilocked(work, &thread->todo);
}
/**
* binder_enqueue_thread_work_ilocked() - Add an item to the thread work list
* @thread: thread to queue work to
* @work: struct binder_work to add to list
*
* Adds the work to the todo list of the thread, and enables processing
* of the todo queue.
*
* Requires the proc->inner_lock to be held.
*/
static void
binder_enqueue_thread_work_ilocked(struct binder_thread *thread,
struct binder_work *work)
{
WARN_ON(!list_empty(&thread->waiting_thread_node));
binder_enqueue_work_ilocked(work, &thread->todo);
/* (e)poll-based threads require an explicit wakeup signal when
* queuing their own work; they rely on these events to consume
* messages without I/O block. Without it, threads risk waiting
* indefinitely without handling the work.
*/
if (thread->looper & BINDER_LOOPER_STATE_POLL &&
thread->pid == current->pid && !thread->process_todo)
wake_up_interruptible_sync(&thread->wait);
thread->process_todo = true;
}
/**
* binder_enqueue_thread_work() - Add an item to the thread work list
* @thread: thread to queue work to
* @work: struct binder_work to add to list
*
* Adds the work to the todo list of the thread, and enables processing
* of the todo queue.
*/
static void
binder_enqueue_thread_work(struct binder_thread *thread,
struct binder_work *work)
{
binder_inner_proc_lock(thread->proc);
binder_enqueue_thread_work_ilocked(thread, work);
binder_inner_proc_unlock(thread->proc);
}
static void
binder_dequeue_work_ilocked(struct binder_work *work)
{
list_del_init(&work->entry);
}
/**
* binder_dequeue_work() - Removes an item from the work list
* @proc: binder_proc associated with list
* @work: struct binder_work to remove from list
*
* Removes the specified work item from whatever list it is on.
* Can safely be called if work is not on any list.
*/
static void
binder_dequeue_work(struct binder_proc *proc, struct binder_work *work)
{
binder_inner_proc_lock(proc);
binder_dequeue_work_ilocked(work);
binder_inner_proc_unlock(proc);
}
static struct binder_work *binder_dequeue_work_head_ilocked(
struct list_head *list)
{
struct binder_work *w;
w = list_first_entry_or_null(list, struct binder_work, entry);
if (w)
list_del_init(&w->entry);
return w;
}
static void
binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
static void binder_free_thread(struct binder_thread *thread);
static void binder_free_proc(struct binder_proc *proc);
static void binder_inc_node_tmpref_ilocked(struct binder_node *node);
static bool binder_has_work_ilocked(struct binder_thread *thread,
bool do_proc_work)
{
return thread->process_todo ||
thread->looper_need_return ||
(do_proc_work &&
!binder_worklist_empty_ilocked(&thread->proc->todo));
}
static bool binder_has_work(struct binder_thread *thread, bool do_proc_work)
{
bool has_work;
binder_inner_proc_lock(thread->proc);
has_work = binder_has_work_ilocked(thread, do_proc_work);
binder_inner_proc_unlock(thread->proc);
return has_work;
}
static bool binder_available_for_proc_work_ilocked(struct binder_thread *thread)
{
return !thread->transaction_stack &&
binder_worklist_empty_ilocked(&thread->todo);
}
static void binder_wakeup_poll_threads_ilocked(struct binder_proc *proc,
bool sync)
{
struct rb_node *n;
struct binder_thread *thread;
for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
thread = rb_entry(n, struct binder_thread, rb_node);
if (thread->looper & BINDER_LOOPER_STATE_POLL &&
binder_available_for_proc_work_ilocked(thread)) {
if (sync)
wake_up_interruptible_sync(&thread->wait);
else
wake_up_interruptible(&thread->wait);
}
}
}
/**
* binder_select_thread_ilocked() - selects a thread for doing proc work.
* @proc: process to select a thread from
*
* Note that calling this function moves the thread off the waiting_threads
* list, so it can only be woken up by the caller of this function, or a
* signal. Therefore, callers *should* always wake up the thread this function
* returns.
*
* Return: If there's a thread currently waiting for process work,
* returns that thread. Otherwise returns NULL.
*/
static struct binder_thread *
binder_select_thread_ilocked(struct binder_proc *proc)
{
struct binder_thread *thread;
assert_spin_locked(&proc->inner_lock);
thread = list_first_entry_or_null(&proc->waiting_threads,
struct binder_thread,
waiting_thread_node);
if (thread)
list_del_init(&thread->waiting_thread_node);
return thread;
}
/**
* binder_wakeup_thread_ilocked() - wakes up a thread for doing proc work.
* @proc: process to wake up a thread in
* @thread: specific thread to wake-up (may be NULL)
* @sync: whether to do a synchronous wake-up
*
* This function wakes up a thread in the @proc process.
* The caller may provide a specific thread to wake-up in
* the @thread parameter. If @thread is NULL, this function
* will wake up threads that have called poll().
*
* Note that for this function to work as expected, callers
* should first call binder_select_thread() to find a thread
* to handle the work (if they don't have a thread already),
* and pass the result into the @thread parameter.
*/
static void binder_wakeup_thread_ilocked(struct binder_proc *proc,
struct binder_thread *thread,
bool sync)
{
assert_spin_locked(&proc->inner_lock);
if (thread) {
if (sync)
wake_up_interruptible_sync(&thread->wait);
else
wake_up_interruptible(&thread->wait);
return;
}
/* Didn't find a thread waiting for proc work; this can happen
* in two scenarios:
* 1. All threads are busy handling transactions
* In that case, one of those threads should call back into
* the kernel driver soon and pick up this work.
* 2. Threads are using the (e)poll interface, in which case
* they may be blocked on the waitqueue without having been
* added to waiting_threads. For this case, we just iterate
* over all threads not handling transaction work, and
* wake them all up. We wake all because we don't know whether
* a thread that called into (e)poll is handling non-binder
* work currently.
*/
binder_wakeup_poll_threads_ilocked(proc, sync);
}
static void binder_wakeup_proc_ilocked(struct binder_proc *proc)
{
struct binder_thread *thread = binder_select_thread_ilocked(proc);
binder_wakeup_thread_ilocked(proc, thread, /* sync = */false);
}
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(rlimit(RLIMIT_NICE));
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;
binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
}
static struct binder_node *binder_get_node_ilocked(struct binder_proc *proc,
binder_uintptr_t ptr)
{
struct rb_node *n = proc->nodes.rb_node;
struct binder_node *node;
assert_spin_locked(&proc->inner_lock);
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 {
/*
* take an implicit weak reference
* to ensure node stays alive until
* call to binder_put_node()
*/
binder_inc_node_tmpref_ilocked(node);
return node;
}
}
return NULL;
}
static struct binder_node *binder_get_node(struct binder_proc *proc,
binder_uintptr_t ptr)
{
struct binder_node *node;
binder_inner_proc_lock(proc);
node = binder_get_node_ilocked(proc, ptr);
binder_inner_proc_unlock(proc);
return node;
}
static struct binder_node *binder_init_node_ilocked(
struct binder_proc *proc,
struct binder_node *new_node,
struct flat_binder_object *fp)
{
struct rb_node **p = &proc->nodes.rb_node;
struct rb_node *parent = NULL;
struct binder_node *node;
binder_uintptr_t ptr = fp ? fp->binder : 0;
binder_uintptr_t cookie = fp ? fp->cookie : 0;
__u32 flags = fp ? fp->flags : 0;
assert_spin_locked(&proc->inner_lock);
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 {
/*
* A matching node is already in
* the rb tree. Abandon the init
* and return it.
*/
binder_inc_node_tmpref_ilocked(node);
return node;
}
}
node = new_node;
binder_stats_created(BINDER_STAT_NODE);
node->tmp_refs++;
rb_link_node(&node->rb_node, parent, p);
rb_insert_color(&node->rb_node, &proc->nodes);
node->debug_id = atomic_inc_return(&binder_last_id);
node->proc = proc;
node->ptr = ptr;
node->cookie = cookie;
node->work.type = BINDER_WORK_NODE;
node->min_priority = flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
node->accept_fds = !!(flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
node->txn_security_ctx = !!(flags & FLAT_BINDER_FLAG_TXN_SECURITY_CTX);
spin_lock_init(&node->lock);
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 struct binder_node *binder_new_node(struct binder_proc *proc,
struct flat_binder_object *fp)
{
struct binder_node *node;
struct binder_node *new_node = kzalloc(sizeof(*node), GFP_KERNEL);
if (!new_node)
return NULL;
binder_inner_proc_lock(proc);
node = binder_init_node_ilocked(proc, new_node, fp);
binder_inner_proc_unlock(proc);
if (node != new_node)
/*
* The node was already added by another thread
*/
kfree(new_node);
return node;
}
static void binder_free_node(struct binder_node *node)
{
kfree(node);
binder_stats_deleted(BINDER_STAT_NODE);
}
static int binder_inc_node_nilocked(struct binder_node *node, int strong,
int internal,
struct list_head *target_list)
{
struct binder_proc *proc = node->proc;
assert_spin_locked(&node->lock);
if (proc)
assert_spin_locked(&proc->inner_lock);
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) {
struct binder_thread *thread = container_of(target_list,
struct binder_thread, todo);
binder_dequeue_work_ilocked(&node->work);
BUG_ON(&thread->todo != target_list);
binder_enqueue_deferred_thread_work_ilocked(thread,
&node->work);
}
} 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;
}
/*
* See comment above
*/
binder_enqueue_work_ilocked(&node->work, target_list);
}
}
return 0;
}
static int binder_inc_node(struct binder_node *node, int strong, int internal,
struct list_head *target_list)
{
int ret;
binder_node_inner_lock(node);
ret = binder_inc_node_nilocked(node, strong, internal, target_list);
binder_node_inner_unlock(node);
return ret;
}
static bool binder_dec_node_nilocked(struct binder_node *node,
int strong, int internal)
{
struct binder_proc *proc = node->proc;
assert_spin_locked(&node->lock);
if (proc)
assert_spin_locked(&proc->inner_lock);
if (strong) {
if (internal)
node->internal_strong_refs--;
else
node->local_strong_refs--;
if (node->local_strong_refs || node->internal_strong_refs)
return false;
} else {
if (!internal)
node->local_weak_refs--;
if (node->local_weak_refs || node->tmp_refs ||
!hlist_empty(&node->refs))
return false;
}
if (proc && (node->has_strong_ref || node->has_weak_ref)) {
if (list_empty(&node->work.entry)) {
binder_enqueue_work_ilocked(&node->work, &proc->todo);
binder_wakeup_proc_ilocked(proc);
}
} else {
if (hlist_empty(&node->refs) && !node->local_strong_refs &&
!node->local_weak_refs && !node->tmp_refs) {
if (proc) {
binder_dequeue_work_ilocked(&node->work);
rb_erase(&node->rb_node, &proc->nodes);
binder_debug(BINDER_DEBUG_INTERNAL_REFS,
"refless node %d deleted\n",
node->debug_id);
} else {
BUG_ON(!list_empty(&node->work.entry));
spin_lock(&binder_dead_nodes_lock);
/*
* tmp_refs could have changed so
* check it again
*/
if (node->tmp_refs) {
spin_unlock(&binder_dead_nodes_lock);
return false;
}
hlist_del(&node->dead_node);
spin_unlock(&binder_dead_nodes_lock);
binder_debug(BINDER_DEBUG_INTERNAL_REFS,
"dead node %d deleted\n",
node->debug_id);
}
return true;
}
}
return false;
}
static void binder_dec_node(struct binder_node *node, int strong, int internal)
{
bool free_node;
binder_node_inner_lock(node);
free_node = binder_dec_node_nilocked(node, strong, internal);
binder_node_inner_unlock(node);
if (free_node)
binder_free_node(node);
}
static void binder_inc_node_tmpref_ilocked(struct binder_node *node)
{
/*
* No call to binder_inc_node() is needed since we
* don't need to inform userspace of any changes to
* tmp_refs
*/
node->tmp_refs++;
}
/**
* binder_inc_node_tmpref() - take a temporary reference on node
* @node: node to reference
*
* Take reference on node to prevent the node from being freed
* while referenced only by a local variable. The inner lock is
* needed to serialize with the node work on the queue (which
* isn't needed after the node is dead). If the node is dead
* (node->proc is NULL), use binder_dead_nodes_lock to protect
* node->tmp_refs against dead-node-only cases where the node
* lock cannot be acquired (eg traversing the dead node list to
* print nodes)
*/
static void binder_inc_node_tmpref(struct binder_node *node)
{
binder_node_lock(node);
if (node->proc)
binder_inner_proc_lock(node->proc);
else
spin_lock(&binder_dead_nodes_lock);
binder_inc_node_tmpref_ilocked(node);
if (node->proc)
binder_inner_proc_unlock(node->proc);
else
spin_unlock(&binder_dead_nodes_lock);
binder_node_unlock(node);
}
/**
* binder_dec_node_tmpref() - remove a temporary reference on node
* @node: node to reference
*
* Release temporary reference on node taken via binder_inc_node_tmpref()
*/
static void binder_dec_node_tmpref(struct binder_node *node)
{
bool free_node;
binder_node_inner_lock(node);
if (!node->proc)
spin_lock(&binder_dead_nodes_lock);
else
__acquire(&binder_dead_nodes_lock);
node->tmp_refs--;
BUG_ON(node->tmp_refs < 0);
if (!node->proc)
spin_unlock(&binder_dead_nodes_lock);
else
__release(&binder_dead_nodes_lock);
/*
* Call binder_dec_node() to check if all refcounts are 0
* and cleanup is needed. Calling with strong=0 and internal=1
* causes no actual reference to be released in binder_dec_node().
* If that changes, a change is needed here too.
*/
free_node = binder_dec_node_nilocked(node, 0, 1);
binder_node_inner_unlock(node);
if (free_node)
binder_free_node(node);
}
static void binder_put_node(struct binder_node *node)
{
binder_dec_node_tmpref(node);
}
static struct binder_ref *binder_get_ref_olocked(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->data.desc) {
n = n->rb_left;
} else if (desc > ref->data.desc) {
n = n->rb_right;
} else if (need_strong_ref && !ref->data.strong) {
binder_user_error("tried to use weak ref as strong ref\n");
return NULL;
} else {
return ref;
}
}
return NULL;
}
/* Find the smallest unused descriptor the "slow way" */
static u32 slow_desc_lookup_olocked(struct binder_proc *proc)
{
struct binder_ref *ref;
struct rb_node *n;
u32 desc;
desc = 1;
for (n = rb_first(&proc->refs_by_desc); n; n = rb_next(n)) {
ref = rb_entry(n, struct binder_ref, rb_node_desc);
if (ref->data.desc > desc)
break;
desc = ref->data.desc + 1;
}
return desc;
}
/*
* Find an available reference descriptor ID. The proc->outer_lock might
* be released in the process, in which case -EAGAIN is returned and the
* @desc should be considered invalid.
*/
static int get_ref_desc_olocked(struct binder_proc *proc,
struct binder_node *node,
u32 *desc)
{
struct dbitmap *dmap = &proc->dmap;
unsigned long *new, bit;
unsigned int nbits;
/* 0 is reserved for the context manager */
if (node == proc->context->binder_context_mgr_node) {
*desc = 0;
return 0;
}
if (!dbitmap_enabled(dmap)) {
*desc = slow_desc_lookup_olocked(proc);
return 0;
}
if (dbitmap_acquire_first_zero_bit(dmap, &bit) == 0) {
*desc = bit;
return 0;
}
/*
* The dbitmap is full and needs to grow. The proc->outer_lock
* is briefly released to allocate the new bitmap safely.
*/
nbits = dbitmap_grow_nbits(dmap);
binder_proc_unlock(proc);
new = bitmap_zalloc(nbits, GFP_KERNEL);
binder_proc_lock(proc);
dbitmap_grow(dmap, new, nbits);
return -EAGAIN;
}
/**
* binder_get_ref_for_node_olocked() - get the ref associated with given node
* @proc: binder_proc that owns the ref
* @node: binder_node of target
* @new_ref: newly allocated binder_ref to be initialized or %NULL
*
* Look up the ref for the given node and return it if it exists
*
* If it doesn't exist and the caller provides a newly allocated
* ref, initialize the fields of the newly allocated ref and insert
* into the given proc rb_trees and node refs list.
*
* Return: the ref for node. It is possible that another thread
* allocated/initialized the ref first in which case the
* returned ref would be different than the passed-in
* new_ref. new_ref must be kfree'd by the caller in
* this case.
*/
static struct binder_ref *binder_get_ref_for_node_olocked(
struct binder_proc *proc,
struct binder_node *node,
struct binder_ref *new_ref)
{
struct binder_ref *ref;
struct rb_node *parent;
struct rb_node **p;
u32 desc;
retry:
p = &proc->refs_by_node.rb_node;
parent = NULL;
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;
}
if (!new_ref)
return NULL;
/* might release the proc->outer_lock */
if (get_ref_desc_olocked(proc, node, &desc) == -EAGAIN)
goto retry;
binder_stats_created(BINDER_STAT_REF);
new_ref->data.debug_id = atomic_inc_return(&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->data.desc = desc;
p = &proc->refs_by_desc.rb_node;
while (*p) {
parent = *p;
ref = rb_entry(parent, struct binder_ref, rb_node_desc);
if (new_ref->data.desc < ref->data.desc)
p = &(*p)->rb_left;
else if (new_ref->data.desc > ref->data.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);
binder_node_lock(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->data.debug_id, new_ref->data.desc,
node->debug_id);
binder_node_unlock(node);
return new_ref;
}
static void binder_cleanup_ref_olocked(struct binder_ref *ref)
{
struct dbitmap *dmap = &ref->proc->dmap;
bool delete_node = false;
binder_debug(BINDER_DEBUG_INTERNAL_REFS,
"%d delete ref %d desc %d for node %d\n",
ref->proc->pid, ref->data.debug_id, ref->data.desc,
ref->node->debug_id);
if (dbitmap_enabled(dmap))
dbitmap_clear_bit(dmap, ref->data.desc);
rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
binder_node_inner_lock(ref->node);
if (ref->data.strong)
binder_dec_node_nilocked(ref->node, 1, 1);
hlist_del(&ref->node_entry);
delete_node = binder_dec_node_nilocked(ref->node, 0, 1);
binder_node_inner_unlock(ref->node);
/*
* Clear ref->node unless we want the caller to free the node
*/
if (!delete_node) {
/*
* The caller uses ref->node to determine
* whether the node needs to be freed. Clear
* it since the node is still alive.
*/
ref->node = NULL;
}
if (ref->death) {
binder_debug(BINDER_DEBUG_DEAD_BINDER,
"%d delete ref %d desc %d has death notification\n",
ref->proc->pid, ref->data.debug_id,
ref->data.desc);
binder_dequeue_work(ref->proc, &ref->death->work);
binder_stats_deleted(BINDER_STAT_DEATH);
}
binder_stats_deleted(BINDER_STAT_REF);
}
/**
* binder_inc_ref_olocked() - increment the ref for given handle
* @ref: ref to be incremented
* @strong: if true, strong increment, else weak
* @target_list: list to queue node work on
*
* Increment the ref. @ref->proc->outer_lock must be held on entry
*
* Return: 0, if successful, else errno
*/
static int binder_inc_ref_olocked(struct binder_ref *ref, int strong,
struct list_head *target_list)
{
int ret;
if (strong) {
if (ref->data.strong == 0) {
ret = binder_inc_node(ref->node, 1, 1, target_list);
if (ret)
return ret;
}
ref->data.strong++;
} else {
if (ref->data.weak == 0) {
ret = binder_inc_node(ref->node, 0, 1, target_list);
if (ret)
return ret;
}
ref->data.weak++;
}
return 0;
}
/**
* binder_dec_ref_olocked() - dec the ref for given handle
* @ref: ref to be decremented
* @strong: if true, strong decrement, else weak
*
* Decrement the ref.
*
* Return: %true if ref is cleaned up and ready to be freed.
*/
static bool binder_dec_ref_olocked(struct binder_ref *ref, int strong)
{
if (strong) {
if (ref->data.strong == 0) {
binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
ref->proc->pid, ref->data.debug_id,
ref->data.desc, ref->data.strong,
ref->data.weak);
return false;
}
ref->data.strong--;
if (ref->data.strong == 0)
binder_dec_node(ref->node, strong, 1);
} else {
if (ref->data.weak == 0) {
binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
ref->proc->pid, ref->data.debug_id,
ref->data.desc, ref->data.strong,
ref->data.weak);
return false;
}
ref->data.weak--;
}
if (ref->data.strong == 0 && ref->data.weak == 0) {
binder_cleanup_ref_olocked(ref);
return true;
}
return false;
}
/**
* binder_get_node_from_ref() - get the node from the given proc/desc
* @proc: proc containing the ref
* @desc: the handle associated with the ref
* @need_strong_ref: if true, only return node if ref is strong
* @rdata: the id/refcount data for the ref
*
* Given a proc and ref handle, return the associated binder_node
*
* Return: a binder_node or NULL if not found or not strong when strong required
*/
static struct binder_node *binder_get_node_from_ref(
struct binder_proc *proc,
u32 desc, bool need_strong_ref,
struct binder_ref_data *rdata)
{
struct binder_node *node;
struct binder_ref *ref;
binder_proc_lock(proc);
ref = binder_get_ref_olocked(proc, desc, need_strong_ref);
if (!ref)
goto err_no_ref;
node = ref->node;
/*
* Take an implicit reference on the node to ensure
* it stays alive until the call to binder_put_node()
*/
binder_inc_node_tmpref(node);
if (rdata)
*rdata = ref->data;
binder_proc_unlock(proc);
return node;
err_no_ref:
binder_proc_unlock(proc);
return NULL;
}
/**
* binder_free_ref() - free the binder_ref
* @ref: ref to free
*
* Free the binder_ref. Free the binder_node indicated by ref->node
* (if non-NULL) and the binder_ref_death indicated by ref->death.
*/
static void binder_free_ref(struct binder_ref *ref)
{
if (ref->node)
binder_free_node(ref->node);
kfree(ref->death);
kfree(ref);
}
/* shrink descriptor bitmap if needed */
static void try_shrink_dmap(struct binder_proc *proc)
{
unsigned long *new;
int nbits;
binder_proc_lock(proc);
nbits = dbitmap_shrink_nbits(&proc->dmap);
binder_proc_unlock(proc);
if (!nbits)
return;
new = bitmap_zalloc(nbits, GFP_KERNEL);
binder_proc_lock(proc);
dbitmap_shrink(&proc->dmap, new, nbits);
binder_proc_unlock(proc);
}
/**
* binder_update_ref_for_handle() - inc/dec the ref for given handle
* @proc: proc containing the ref
* @desc: the handle associated with the ref
* @increment: true=inc reference, false=dec reference
* @strong: true=strong reference, false=weak reference
* @rdata: the id/refcount data for the ref
*
* Given a proc and ref handle, increment or decrement the ref
* according to "increment" arg.
*
* Return: 0 if successful, else errno
*/
static int binder_update_ref_for_handle(struct binder_proc *proc,
uint32_t desc, bool increment, bool strong,
struct binder_ref_data *rdata)
{
int ret = 0;
struct binder_ref *ref;
bool delete_ref = false;
binder_proc_lock(proc);
ref = binder_get_ref_olocked(proc, desc, strong);
if (!ref) {
ret = -EINVAL;
goto err_no_ref;
}
if (increment)
ret = binder_inc_ref_olocked(ref, strong, NULL);
else
delete_ref = binder_dec_ref_olocked(ref, strong);
if (rdata)
*rdata = ref->data;
binder_proc_unlock(proc);
if (delete_ref) {
binder_free_ref(ref);
try_shrink_dmap(proc);
}
return ret;
err_no_ref:
binder_proc_unlock(proc);
return ret;
}
/**
* binder_dec_ref_for_handle() - dec the ref for given handle
* @proc: proc containing the ref
* @desc: the handle associated with the ref
* @strong: true=strong reference, false=weak reference
* @rdata: the id/refcount data for the ref
*
* Just calls binder_update_ref_for_handle() to decrement the ref.
*
* Return: 0 if successful, else errno
*/
static int binder_dec_ref_for_handle(struct binder_proc *proc,
uint32_t desc, bool strong, struct binder_ref_data *rdata)
{
return binder_update_ref_for_handle(proc, desc, false, strong, rdata);
}
/**
* binder_inc_ref_for_node() - increment the ref for given proc/node
* @proc: proc containing the ref
* @node: target node
* @strong: true=strong reference, false=weak reference
* @target_list: worklist to use if node is incremented
* @rdata: the id/refcount data for the ref
*
* Given a proc and node, increment the ref. Create the ref if it
* doesn't already exist
*
* Return: 0 if successful, else errno
*/
static int binder_inc_ref_for_node(struct binder_proc *proc,
struct binder_node *node,
bool strong,
struct list_head *target_list,
struct binder_ref_data *rdata)
{
struct binder_ref *ref;
struct binder_ref *new_ref = NULL;
int ret = 0;
binder_proc_lock(proc);
ref = binder_get_ref_for_node_olocked(proc, node, NULL);
if (!ref) {
binder_proc_unlock(proc);
new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
if (!new_ref)
return -ENOMEM;
binder_proc_lock(proc);
ref = binder_get_ref_for_node_olocked(proc, node, new_ref);
}
ret = binder_inc_ref_olocked(ref, strong, target_list);
*rdata = ref->data;
if (ret && ref == new_ref) {
/*
* Cleanup the failed reference here as the target
* could now be dead and have already released its
* references by now. Calling on the new reference
* with strong=0 and a tmp_refs will not decrement
* the node. The new_ref gets kfree'd below.
*/
binder_cleanup_ref_olocked(new_ref);
ref = NULL;
}
binder_proc_unlock(proc);
if (new_ref && ref != new_ref)
/*
* Another thread created the ref first so
* free the one we allocated
*/
kfree(new_ref);
return ret;
}
static void binder_pop_transaction_ilocked(struct binder_thread *target_thread,
struct binder_transaction *t)
{
BUG_ON(!target_thread);
assert_spin_locked(&target_thread->proc->inner_lock);
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;
}
/**
* binder_thread_dec_tmpref() - decrement thread->tmp_ref
* @thread: thread to decrement
*
* A thread needs to be kept alive while being used to create or
* handle a transaction. binder_get_txn_from() is used to safely
* extract t->from from a binder_transaction and keep the thread
* indicated by t->from from being freed. When done with that
* binder_thread, this function is called to decrement the
* tmp_ref and free if appropriate (thread has been released
* and no transaction being processed by the driver)
*/
static void binder_thread_dec_tmpref(struct binder_thread *thread)
{
/*
* atomic is used to protect the counter value while
* it cannot reach zero or thread->is_dead is false
*/
binder_inner_proc_lock(thread->proc);
atomic_dec(&thread->tmp_ref);
if (thread->is_dead && !atomic_read(&thread->tmp_ref)) {
binder_inner_proc_unlock(thread->proc);
binder_free_thread(thread);
return;
}
binder_inner_proc_unlock(thread->proc);
}
/**
* binder_proc_dec_tmpref() - decrement proc->tmp_ref
* @proc: proc to decrement
*
* A binder_proc needs to be kept alive while being used to create or
* handle a transaction. proc->tmp_ref is incremented when
* creating a new transaction or the binder_proc is currently in-use
* by threads that are being released. When done with the binder_proc,
* this function is called to decrement the counter and free the
* proc if appropriate (proc has been released, all threads have
* been released and not currenly in-use to process a transaction).
*/
static void binder_proc_dec_tmpref(struct binder_proc *proc)
{
binder_inner_proc_lock(proc);
proc->tmp_ref--;
if (proc->is_dead && RB_EMPTY_ROOT(&proc->threads) &&
!proc->tmp_ref) {
binder_inner_proc_unlock(proc);
binder_free_proc(proc);
return;
}
binder_inner_proc_unlock(proc);
}
/**
* binder_get_txn_from() - safely extract the "from" thread in transaction
* @t: binder transaction for t->from
*
* Atomically return the "from" thread and increment the tmp_ref
* count for the thread to ensure it stays alive until
* binder_thread_dec_tmpref() is called.
*
* Return: the value of t->from
*/
static struct binder_thread *binder_get_txn_from(
struct binder_transaction *t)
{
struct binder_thread *from;
spin_lock(&t->lock);
from = t->from;
if (from)
atomic_inc(&from->tmp_ref);
spin_unlock(&t->lock);
return from;
}
/**
* binder_get_txn_from_and_acq_inner() - get t->from and acquire inner lock
* @t: binder transaction for t->from
*
* Same as binder_get_txn_from() except it also acquires the proc->inner_lock
* to guarantee that the thread cannot be released while operating on it.
* The caller must call binder_inner_proc_unlock() to release the inner lock
* as well as call binder_dec_thread_txn() to release the reference.
*
* Return: the value of t->from
*/
static struct binder_thread *binder_get_txn_from_and_acq_inner(
struct binder_transaction *t)
__acquires(&t->from->proc->inner_lock)
{
struct binder_thread *from;
from = binder_get_txn_from(t);
if (!from) {
__acquire(&from->proc->inner_lock);
return NULL;
}
binder_inner_proc_lock(from->proc);
if (t->from) {
BUG_ON(from != t->from);
return from;
}
binder_inner_proc_unlock(from->proc);
__acquire(&from->proc->inner_lock);
binder_thread_dec_tmpref(from);
return NULL;
}
/**
* binder_free_txn_fixups() - free unprocessed fd fixups
* @t: binder transaction for t->from
*
* If the transaction is being torn down prior to being
* processed by the target process, free all of the
* fd fixups and fput the file structs. It is safe to
* call this function after the fixups have been
* processed -- in that case, the list will be empty.
*/
static void binder_free_txn_fixups(struct binder_transaction *t)
{
struct binder_txn_fd_fixup *fixup, *tmp;
list_for_each_entry_safe(fixup, tmp, &t->fd_fixups, fixup_entry) {
fput(fixup->file);
if (fixup->target_fd >= 0)
put_unused_fd(fixup->target_fd);
list_del(&fixup->fixup_entry);
kfree(fixup);
}
}
static void binder_txn_latency_free(struct binder_transaction *t)
{
int from_proc, from_thread, to_proc, to_thread;
spin_lock(&t->lock);
from_proc = t->from ? t->from->proc->pid : 0;
from_thread = t->from ? t->from->pid : 0;
to_proc = t->to_proc ? t->to_proc->pid : 0;
to_thread = t->to_thread ? t->to_thread->pid : 0;
spin_unlock(&t->lock);
trace_binder_txn_latency_free(t, from_proc, from_thread, to_proc, to_thread);
}
static void binder_free_transaction(struct binder_transaction *t)
{
struct binder_proc *target_proc = t->to_proc;
if (target_proc) {
binder_inner_proc_lock(target_proc);
target_proc->outstanding_txns--;
if (target_proc->outstanding_txns < 0)
pr_warn("%s: Unexpected outstanding_txns %d\n",
__func__, target_proc->outstanding_txns);
if (!target_proc->outstanding_txns && target_proc->is_frozen)
wake_up_interruptible_all(&target_proc->freeze_wait);
if (t->buffer)
t->buffer->transaction = NULL;
binder_inner_proc_unlock(target_proc);
}
if (trace_binder_txn_latency_free_enabled())
binder_txn_latency_free(t);
/*
* If the transaction has no target_proc, then
* t->buffer->transaction has already been cleared.
*/
binder_free_txn_fixups(t);
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 = binder_get_txn_from_and_acq_inner(t);
if (target_thread) {
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_ilocked(target_thread, t);
if (target_thread->reply_error.cmd == BR_OK) {
target_thread->reply_error.cmd = error_code;
binder_enqueue_thread_work_ilocked(
target_thread,
&target_thread->reply_error.work);
wake_up_interruptible(&target_thread->wait);
} else {
/*
* Cannot get here for normal operation, but
* we can if multiple synchronous transactions
* are sent without blocking for responses.
* Just ignore the 2nd error in this case.
*/
pr_warn("Unexpected reply error: %u\n",
target_thread->reply_error.cmd);
}
binder_inner_proc_unlock(target_thread->proc);
binder_thread_dec_tmpref(target_thread);
binder_free_transaction(t);
return;
}
__release(&target_thread->proc->inner_lock);
next = t->from_parent;
binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
"send failed reply for transaction %d, target dead\n",
t->debug_id);
binder_free_transaction(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_cleanup_transaction() - cleans up undelivered transaction
* @t: transaction that needs to be cleaned up
* @reason: reason the transaction wasn't delivered
* @error_code: error to return to caller (if synchronous call)
*/
static void binder_cleanup_transaction(struct binder_transaction *t,
const char *reason,
uint32_t error_code)
{
if (t->buffer->target_node && !(t->flags & TF_ONE_WAY)) {
binder_send_failed_reply(t, error_code);
} else {
binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
"undelivered transaction %d, %s\n",
t->debug_id, reason);
binder_free_transaction(t);
}
}
/**
* binder_get_object() - gets object and checks for valid metadata
* @proc: binder_proc owning the buffer
* @u: sender's user pointer to base of buffer
* @buffer: binder_buffer that we're parsing.
* @offset: offset in the @buffer at which to validate an object.
* @object: struct binder_object to read into
*
* Copy the binder object at the given offset into @object. If @u is
* provided then the copy is from the sender's buffer. If not, then
* it is copied from the target's @buffer.
*
* Return: If there's a valid metadata object at @offset, the
* size of that object. Otherwise, it returns zero. The object
* is read into the struct binder_object pointed to by @object.
*/
static size_t binder_get_object(struct binder_proc *proc,
const void __user *u,
struct binder_buffer *buffer,
unsigned long offset,
struct binder_object *object)
{
size_t read_size;
struct binder_object_header *hdr;
size_t object_size = 0;
read_size = min_t(size_t, sizeof(*object), buffer->data_size - offset);
if (offset > buffer->data_size || read_size < sizeof(*hdr) ||
!IS_ALIGNED(offset, sizeof(u32)))
return 0;
if (u) {
if (copy_from_user(object, u + offset, read_size))
return 0;
} else {
if (binder_alloc_copy_from_buffer(&proc->alloc, object, buffer,
offset, read_size))
return 0;
}
/* Ok, now see if we read a complete object. */
hdr = &object->hdr;
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.
* @proc: binder_proc owning the buffer
* @b: binder_buffer containing the object
* @object: struct binder_object to read into
* @index: index in offset array at which the binder_buffer_object is
* located
* @start_offset: points to the start of the offset array
* @object_offsetp: offset of @object read from @b
* @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.
* If @object_offsetp is non-NULL, then the offset within
* @b is written to it.
*/
static struct binder_buffer_object *binder_validate_ptr(
struct binder_proc *proc,
struct binder_buffer *b,
struct binder_object *object,
binder_size_t index,
binder_size_t start_offset,
binder_size_t *object_offsetp,
binder_size_t num_valid)
{
size_t object_size;
binder_size_t object_offset;
unsigned long buffer_offset;
if (index >= num_valid)
return NULL;
buffer_offset = start_offset + sizeof(binder_size_t) * index;
if (binder_alloc_copy_from_buffer(&proc->alloc, &object_offset,
b, buffer_offset,
sizeof(object_offset)))
return NULL;
object_size = binder_get_object(proc, NULL, b, object_offset, object);
if (!object_size || object->hdr.type != BINDER_TYPE_PTR)
return NULL;
if (object_offsetp)
*object_offsetp = object_offset;
return &object->bbo;
}
/**
* binder_validate_fixup() - validates pointer/fd fixups happen in order.
* @proc: binder_proc owning the buffer
* @b: transaction buffer
* @objects_start_offset: offset to start of objects buffer
* @buffer_obj_offset: offset to binder_buffer_object in which to fix up
* @fixup_offset: start offset in @buffer to fix up
* @last_obj_offset: offset to last binder_buffer_object that we fixed
* @last_min_offset: minimum fixup offset in object at @last_obj_offset
*
* 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_proc *proc,
struct binder_buffer *b,
binder_size_t objects_start_offset,
binder_size_t buffer_obj_offset,
binder_size_t fixup_offset,
binder_size_t last_obj_offset,
binder_size_t last_min_offset)
{
if (!last_obj_offset) {
/* Nothing to fix up in */
return false;
}
while (last_obj_offset != buffer_obj_offset) {
unsigned long buffer_offset;
struct binder_object last_object;
struct binder_buffer_object *last_bbo;
size_t object_size = binder_get_object(proc, NULL, b,
last_obj_offset,
&last_object);
if (object_size != sizeof(*last_bbo))
return false;
last_bbo = &last_object.bbo;
/*
* Safe to retrieve the parent of last_obj, since it
* was already previously verified by the driver.
*/
if ((last_bbo->flags & BINDER_BUFFER_FLAG_HAS_PARENT) == 0)
return false;
last_min_offset = last_bbo->parent_offset + sizeof(uintptr_t);
buffer_offset = objects_start_offset +
sizeof(binder_size_t) * last_bbo->parent;
if (binder_alloc_copy_from_buffer(&proc->alloc,
&last_obj_offset,
b, buffer_offset,
sizeof(last_obj_offset)))
return false;
}
return (fixup_offset >= last_min_offset);
}
/**
* struct binder_task_work_cb - for deferred close
*
* @twork: callback_head for task work
* @fd: fd to close
*
* Structure to pass task work to be handled after
* returning from binder_ioctl() via task_work_add().
*/
struct binder_task_work_cb {
struct callback_head twork;
struct file *file;
};
/**
* binder_do_fd_close() - close list of file descriptors
* @twork: callback head for task work
*
* It is not safe to call ksys_close() during the binder_ioctl()
* function if there is a chance that binder's own file descriptor
* might be closed. This is to meet the requirements for using
* fdget() (see comments for __fget_light()). Therefore use
* task_work_add() to schedule the close operation once we have
* returned from binder_ioctl(). This function is a callback
* for that mechanism and does the actual ksys_close() on the
* given file descriptor.
*/
static void binder_do_fd_close(struct callback_head *twork)
{
struct binder_task_work_cb *twcb = container_of(twork,
struct binder_task_work_cb, twork);
fput(twcb->file);
kfree(twcb);
}
/**
* binder_deferred_fd_close() - schedule a close for the given file-descriptor
* @fd: file-descriptor to close
*
* See comments in binder_do_fd_close(). This function is used to schedule
* a file-descriptor to be closed after returning from binder_ioctl().
*/
static void binder_deferred_fd_close(int fd)
{
struct binder_task_work_cb *twcb;
twcb = kzalloc(sizeof(*twcb), GFP_KERNEL);
if (!twcb)
return;
init_task_work(&twcb->twork, binder_do_fd_close);
twcb->file = file_close_fd(fd);
if (twcb->file) {
// pin it until binder_do_fd_close(); see comments there
get_file(twcb->file);
filp_close(twcb->file, current->files);
task_work_add(current, &twcb->twork, TWA_RESUME);
} else {
kfree(twcb);
}
}
static void binder_transaction_buffer_release(struct binder_proc *proc,
struct binder_thread *thread,
struct binder_buffer *buffer,
binder_size_t off_end_offset,
bool is_failure)
{
int debug_id = buffer->debug_id;
binder_size_t off_start_offset, buffer_offset;
binder_debug(BINDER_DEBUG_TRANSACTION,
"%d buffer release %d, size %zd-%zd, failed at %llx\n",
proc->pid, buffer->debug_id,
buffer->data_size, buffer->offsets_size,
(unsigned long long)off_end_offset);
if (buffer->target_node)
binder_dec_node(buffer->target_node, 1, 0);
off_start_offset = ALIGN(buffer->data_size, sizeof(void *));
for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
buffer_offset += sizeof(binder_size_t)) {
struct binder_object_header *hdr;
size_t object_size = 0;
struct binder_object object;
binder_size_t object_offset;
if (!binder_alloc_copy_from_buffer(&proc->alloc, &object_offset,
buffer, buffer_offset,
sizeof(object_offset)))
object_size = binder_get_object(proc, NULL, buffer,
object_offset, &object);
if (object_size == 0) {
pr_err("transaction release %d bad object at offset %lld, size %zd\n",
debug_id, (u64)object_offset, buffer->data_size);
continue;
}
hdr = &object.hdr;
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);
binder_put_node(node);
} break;
case BINDER_TYPE_HANDLE:
case BINDER_TYPE_WEAK_HANDLE: {
struct flat_binder_object *fp;
struct binder_ref_data rdata;
int ret;
fp = to_flat_binder_object(hdr);
ret = binder_dec_ref_for_handle(proc, fp->handle,
hdr->type == BINDER_TYPE_HANDLE, &rdata);
if (ret) {
pr_err("transaction release %d bad handle %d, ret = %d\n",
debug_id, fp->handle, ret);
break;
}
binder_debug(BINDER_DEBUG_TRANSACTION,
" ref %d desc %d\n",
rdata.debug_id, rdata.desc);
} break;
case BINDER_TYPE_FD: {
/*
* No need to close the file here since user-space
* closes it for successfully delivered
* transactions. For transactions that weren't
* delivered, the new fd was never allocated so
* there is no need to close and the fput on the
* file is done when the transaction is torn
* down.
*/
} 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;
struct binder_object ptr_object;
binder_size_t fda_offset;
size_t fd_index;
binder_size_t fd_buf_size;
binder_size_t num_valid;
if (is_failure) {
/*
* The fd fixups have not been applied so no
* fds need to be closed.
*/
continue;
}
num_valid = (buffer_offset - off_start_offset) /
sizeof(binder_size_t);
fda = to_binder_fd_array_object(hdr);
parent = binder_validate_ptr(proc, buffer, &ptr_object,
fda->parent,
off_start_offset,
NULL,
num_valid);
if (!parent) {
pr_err("transaction release %d bad parent offset\n",
debug_id);
continue;
}
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;
}
/*
* the source data for binder_buffer_object is visible
* to user-space and the @buffer element is the user
* pointer to the buffer_object containing the fd_array.
* Convert the address to an offset relative to
* the base of the transaction buffer.
*/
fda_offset = parent->buffer - buffer->user_data +
fda->parent_offset;
for (fd_index = 0; fd_index < fda->num_fds;
fd_index++) {
u32 fd;
int err;
binder_size_t offset = fda_offset +
fd_index * sizeof(fd);
err = binder_alloc_copy_from_buffer(
&proc->alloc, &fd, buffer,
offset, sizeof(fd));
WARN_ON(err);
if (!err) {
binder_deferred_fd_close(fd);
/*
* Need to make sure the thread goes
* back to userspace to complete the
* deferred close
*/
if (thread)
thread->looper_need_return = true;
}
}
} break;
default:
pr_err("transaction release %d bad object type %x\n",
debug_id, hdr->type);
break;
}
}
}
/* Clean up all the objects in the buffer */
static inline void binder_release_entire_buffer(struct binder_proc *proc,
struct binder_thread *thread,
struct binder_buffer *buffer,
bool is_failure)
{
binder_size_t off_end_offset;
off_end_offset = ALIGN(buffer->data_size, sizeof(void *));
off_end_offset += buffer->offsets_size;
binder_transaction_buffer_release(proc, thread, buffer,
off_end_offset, is_failure);
}
static int binder_translate_binder(struct flat_binder_object *fp,
struct binder_transaction *t,
struct binder_thread *thread)
{
struct binder_node *node;
struct binder_proc *proc = thread->proc;
struct binder_proc *target_proc = t->to_proc;
struct binder_ref_data rdata;
int ret = 0;
node = binder_get_node(proc, fp->binder);
if (!node) {
node = binder_new_node(proc, fp);
if (!node)
return -ENOMEM;
}
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);
ret = -EINVAL;
goto done;
}
if (security_binder_transfer_binder(proc->cred, target_proc->cred)) {
ret = -EPERM;
goto done;
}
ret = binder_inc_ref_for_node(target_proc, node,
fp->hdr.type == BINDER_TYPE_BINDER,
&thread->todo, &rdata);
if (ret)
goto done;
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 = rdata.desc;
fp->cookie = 0;
trace_binder_transaction_node_to_ref(t, node, &rdata);
binder_debug(BINDER_DEBUG_TRANSACTION,
" node %d u%016llx -> ref %d desc %d\n",
node->debug_id, (u64)node->ptr,
rdata.debug_id, rdata.desc);
done:
binder_put_node(node);
return ret;
}
static int binder_translate_handle(struct flat_binder_object *fp,
struct binder_transaction *t,
struct binder_thread *thread)
{
struct binder_proc *proc = thread->proc;
struct binder_proc *target_proc = t->to_proc;
struct binder_node *node;
struct binder_ref_data src_rdata;
int ret = 0;
node = binder_get_node_from_ref(proc, fp->handle,
fp->hdr.type == BINDER_TYPE_HANDLE, &src_rdata);
if (!node) {
binder_user_error("%d:%d got transaction with invalid handle, %d\n",
proc->pid, thread->pid, fp->handle);
return -EINVAL;
}
if (security_binder_transfer_binder(proc->cred, target_proc->cred)) {
ret = -EPERM;
goto done;
}
binder_node_lock(node);
if (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 = node->ptr;
fp->cookie = node->cookie;
if (node->proc)
binder_inner_proc_lock(node->proc);
else
__acquire(&node->proc->inner_lock);
binder_inc_node_nilocked(node,
fp->hdr.type == BINDER_TYPE_BINDER,
0, NULL);
if (node->proc)
binder_inner_proc_unlock(node->proc);
else
__release(&node->proc->inner_lock);
trace_binder_transaction_ref_to_node(t, node, &src_rdata);
binder_debug(BINDER_DEBUG_TRANSACTION,
" ref %d desc %d -> node %d u%016llx\n",
src_rdata.debug_id, src_rdata.desc, node->debug_id,
(u64)node->ptr);
binder_node_unlock(node);
} else {
struct binder_ref_data dest_rdata;
binder_node_unlock(node);
ret = binder_inc_ref_for_node(target_proc, node,
fp->hdr.type == BINDER_TYPE_HANDLE,
NULL, &dest_rdata);
if (ret)
goto done;
fp->binder = 0;
fp->handle = dest_rdata.desc;
fp->cookie = 0;
trace_binder_transaction_ref_to_ref(t, node, &src_rdata,
&dest_rdata);
binder_debug(BINDER_DEBUG_TRANSACTION,
" ref %d desc %d -> ref %d desc %d (node %d)\n",
src_rdata.debug_id, src_rdata.desc,
dest_rdata.debug_id, dest_rdata.desc,
node->debug_id);
}
done:
binder_put_node(node);
return ret;
}
static int binder_translate_fd(u32 fd, binder_size_t fd_offset,
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;
struct binder_txn_fd_fixup *fixup;
struct file *file;
int ret = 0;
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;
}
ret = security_binder_transfer_file(proc->cred, target_proc->cred, file);
if (ret < 0) {
ret = -EPERM;
goto err_security;
}
/*
* Add fixup record for this transaction. The allocation
* of the fd in the target needs to be done from a
* target thread.
*/
fixup = kzalloc(sizeof(*fixup), GFP_KERNEL);
if (!fixup) {
ret = -ENOMEM;
goto err_alloc;
}
fixup->file = file;
fixup->offset = fd_offset;
fixup->target_fd = -1;
trace_binder_transaction_fd_send(t, fd, fixup->offset);
list_add_tail(&fixup->fixup_entry, &t->fd_fixups);
return ret;
err_alloc:
err_security:
fput(file);
err_fget:
err_fd_not_accepted:
return ret;
}
/**
* struct binder_ptr_fixup - data to be fixed-up in target buffer
* @offset offset in target buffer to fixup
* @skip_size bytes to skip in copy (fixup will be written later)
* @fixup_data data to write at fixup offset
* @node list node
*
* This is used for the pointer fixup list (pf) which is created and consumed
* during binder_transaction() and is only accessed locally. No
* locking is necessary.
*
* The list is ordered by @offset.
*/
struct binder_ptr_fixup {
binder_size_t offset;
size_t skip_size;
binder_uintptr_t fixup_data;
struct list_head node;
};
/**
* struct binder_sg_copy - scatter-gather data to be copied
* @offset offset in target buffer
* @sender_uaddr user address in source buffer
* @length bytes to copy
* @node list node
*
* This is used for the sg copy list (sgc) which is created and consumed
* during binder_transaction() and is only accessed locally. No
* locking is necessary.
*
* The list is ordered by @offset.
*/
struct binder_sg_copy {
binder_size_t offset;
const void __user *sender_uaddr;
size_t length;
struct list_head node;
};
/**
* binder_do_deferred_txn_copies() - copy and fixup scatter-gather data
* @alloc: binder_alloc associated with @buffer
* @buffer: binder buffer in target process
* @sgc_head: list_head of scatter-gather copy list
* @pf_head: list_head of pointer fixup list
*
* Processes all elements of @sgc_head, applying fixups from @pf_head
* and copying the scatter-gather data from the source process' user
* buffer to the target's buffer. It is expected that the list creation
* and processing all occurs during binder_transaction() so these lists
* are only accessed in local context.
*
* Return: 0=success, else -errno
*/
static int binder_do_deferred_txn_copies(struct binder_alloc *alloc,
struct binder_buffer *buffer,
struct list_head *sgc_head,
struct list_head *pf_head)
{
int ret = 0;
struct binder_sg_copy *sgc, *tmpsgc;
struct binder_ptr_fixup *tmppf;
struct binder_ptr_fixup *pf =
list_first_entry_or_null(pf_head, struct binder_ptr_fixup,
node);
list_for_each_entry_safe(sgc, tmpsgc, sgc_head, node) {
size_t bytes_copied = 0;
while (bytes_copied < sgc->length) {
size_t copy_size;
size_t bytes_left = sgc->length - bytes_copied;
size_t offset = sgc->offset + bytes_copied;
/*
* We copy up to the fixup (pointed to by pf)
*/
copy_size = pf ? min(bytes_left, (size_t)pf->offset - offset)
: bytes_left;
if (!ret && copy_size)
ret = binder_alloc_copy_user_to_buffer(
alloc, buffer,
offset,
sgc->sender_uaddr + bytes_copied,
copy_size);
bytes_copied += copy_size;
if (copy_size != bytes_left) {
BUG_ON(!pf);
/* we stopped at a fixup offset */
if (pf->skip_size) {
/*
* we are just skipping. This is for
* BINDER_TYPE_FDA where the translated
* fds will be fixed up when we get
* to target context.
*/
bytes_copied += pf->skip_size;
} else {
/* apply the fixup indicated by pf */
if (!ret)
ret = binder_alloc_copy_to_buffer(
alloc, buffer,
pf->offset,
&pf->fixup_data,
sizeof(pf->fixup_data));
bytes_copied += sizeof(pf->fixup_data);
}
list_del(&pf->node);
kfree(pf);
pf = list_first_entry_or_null(pf_head,
struct binder_ptr_fixup, node);
}
}
list_del(&sgc->node);
kfree(sgc);
}
list_for_each_entry_safe(pf, tmppf, pf_head, node) {
BUG_ON(pf->skip_size == 0);
list_del(&pf->node);
kfree(pf);
}
BUG_ON(!list_empty(sgc_head));
return ret > 0 ? -EINVAL : ret;
}
/**
* binder_cleanup_deferred_txn_lists() - free specified lists
* @sgc_head: list_head of scatter-gather copy list
* @pf_head: list_head of pointer fixup list
*
* Called to clean up @sgc_head and @pf_head if there is an
* error.
*/
static void binder_cleanup_deferred_txn_lists(struct list_head *sgc_head,
struct list_head *pf_head)
{
struct binder_sg_copy *sgc, *tmpsgc;
struct binder_ptr_fixup *pf, *tmppf;
list_for_each_entry_safe(sgc, tmpsgc, sgc_head, node) {
list_del(&sgc->node);
kfree(sgc);
}
list_for_each_entry_safe(pf, tmppf, pf_head, node) {
list_del(&pf->node);
kfree(pf);
}
}
/**
* binder_defer_copy() - queue a scatter-gather buffer for copy
* @sgc_head: list_head of scatter-gather copy list
* @offset: binder buffer offset in target process
* @sender_uaddr: user address in source process
* @length: bytes to copy
*
* Specify a scatter-gather block to be copied. The actual copy must
* be deferred until all the needed fixups are identified and queued.
* Then the copy and fixups are done together so un-translated values
* from the source are never visible in the target buffer.
*
* We are guaranteed that repeated calls to this function will have
* monotonically increasing @offset values so the list will naturally
* be ordered.
*
* Return: 0=success, else -errno
*/
static int binder_defer_copy(struct list_head *sgc_head, binder_size_t offset,
const void __user *sender_uaddr, size_t length)
{
struct binder_sg_copy *bc = kzalloc(sizeof(*bc), GFP_KERNEL);
if (!bc)
return -ENOMEM;
bc->offset = offset;
bc->sender_uaddr = sender_uaddr;
bc->length = length;
INIT_LIST_HEAD(&bc->node);
/*
* We are guaranteed that the deferred copies are in-order
* so just add to the tail.
*/
list_add_tail(&bc->node, sgc_head);
return 0;
}
/**
* binder_add_fixup() - queue a fixup to be applied to sg copy
* @pf_head: list_head of binder ptr fixup list
* @offset: binder buffer offset in target process
* @fixup: bytes to be copied for fixup
* @skip_size: bytes to skip when copying (fixup will be applied later)
*
* Add the specified fixup to a list ordered by @offset. When copying
* the scatter-gather buffers, the fixup will be copied instead of
* data from the source buffer. For BINDER_TYPE_FDA fixups, the fixup
* will be applied later (in target process context), so we just skip
* the bytes specified by @skip_size. If @skip_size is 0, we copy the
* value in @fixup.
*
* This function is called *mostly* in @offset order, but there are
* exceptions. Since out-of-order inserts are relatively uncommon,
* we insert the new element by searching backward from the tail of
* the list.
*
* Return: 0=success, else -errno
*/
static int binder_add_fixup(struct list_head *pf_head, binder_size_t offset,
binder_uintptr_t fixup, size_t skip_size)
{
struct binder_ptr_fixup *pf = kzalloc(sizeof(*pf), GFP_KERNEL);
struct binder_ptr_fixup *tmppf;
if (!pf)
return -ENOMEM;
pf->offset = offset;
pf->fixup_data = fixup;
pf->skip_size = skip_size;
INIT_LIST_HEAD(&pf->node);
/* Fixups are *mostly* added in-order, but there are some
* exceptions. Look backwards through list for insertion point.
*/
list_for_each_entry_reverse(tmppf, pf_head, node) {
if (tmppf->offset < pf->offset) {
list_add(&pf->node, &tmppf->node);
return 0;
}
}
/*
* if we get here, then the new offset is the lowest so
* insert at the head
*/
list_add(&pf->node, pf_head);
return 0;
}
static int binder_translate_fd_array(struct list_head *pf_head,
struct binder_fd_array_object *fda,
const void __user *sender_ubuffer,
struct binder_buffer_object *parent,
struct binder_buffer_object *sender_uparent,
struct binder_transaction *t,
struct binder_thread *thread,
struct binder_transaction *in_reply_to)
{
binder_size_t fdi, fd_buf_size;
binder_size_t fda_offset;
const void __user *sender_ufda_base;
struct binder_proc *proc = thread->proc;
int ret;
if (fda->num_fds == 0)
return 0;
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;
}
/*
* the source data for binder_buffer_object is visible
* to user-space and the @buffer element is the user
* pointer to the buffer_object containing the fd_array.
* Convert the address to an offset relative to
* the base of the transaction buffer.
*/
fda_offset = parent->buffer - t->buffer->user_data +
fda->parent_offset;
sender_ufda_base = (void __user *)(uintptr_t)sender_uparent->buffer +
fda->parent_offset;
if (!IS_ALIGNED((unsigned long)fda_offset, sizeof(u32)) ||
!IS_ALIGNED((unsigned long)sender_ufda_base, sizeof(u32))) {
binder_user_error("%d:%d parent offset not aligned correctly.\n",
proc->pid, thread->pid);
return -EINVAL;
}
ret = binder_add_fixup(pf_head, fda_offset, 0, fda->num_fds * sizeof(u32));
if (ret)
return ret;
for (fdi = 0; fdi < fda->num_fds; fdi++) {
u32 fd;
binder_size_t offset = fda_offset + fdi * sizeof(fd);
binder_size_t sender_uoffset = fdi * sizeof(fd);
ret = copy_from_user(&fd, sender_ufda_base + sender_uoffset, sizeof(fd));
if (!ret)
ret = binder_translate_fd(fd, offset, t, thread,
in_reply_to);
if (ret)
return ret > 0 ? -EINVAL : ret;
}
return 0;
}
static int binder_fixup_parent(struct list_head *pf_head,
struct binder_transaction *t,
struct binder_thread *thread,
struct binder_buffer_object *bp,
binder_size_t off_start_offset,
binder_size_t num_valid,
binder_size_t last_fixup_obj_off,
binder_size_t last_fixup_min_off)
{
struct binder_buffer_object *parent;
struct binder_buffer *b = t->buffer;
struct binder_proc *proc = thread->proc;
struct binder_proc *target_proc = t->to_proc;
struct binder_object object;
binder_size_t buffer_offset;
binder_size_t parent_offset;
if (!(bp->flags & BINDER_BUFFER_FLAG_HAS_PARENT))
return 0;
parent = binder_validate_ptr(target_proc, b, &object, bp->parent,
off_start_offset, &parent_offset,
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(target_proc, b, off_start_offset,
parent_offset, bp->parent_offset,
last_fixup_obj_off,
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;
}
buffer_offset = bp->parent_offset + parent->buffer - b->user_data;
return binder_add_fixup(pf_head, buffer_offset, bp->buffer, 0);
}
/**
* binder_can_update_transaction() - Can a txn be superseded by an updated one?
* @t1: the pending async txn in the frozen process
* @t2: the new async txn to supersede the outdated pending one
*
* Return: true if t2 can supersede t1
* false if t2 can not supersede t1
*/
static bool binder_can_update_transaction(struct binder_transaction *t1,
struct binder_transaction *t2)
{
if ((t1->flags & t2->flags & (TF_ONE_WAY | TF_UPDATE_TXN)) !=
(TF_ONE_WAY | TF_UPDATE_TXN) || !t1->to_proc || !t2->to_proc)
return false;
if (t1->to_proc->tsk == t2->to_proc->tsk && t1->code == t2->code &&
t1->flags == t2->flags && t1->buffer->pid == t2->buffer->pid &&
t1->buffer->target_node->ptr == t2->buffer->target_node->ptr &&
t1->buffer->target_node->cookie == t2->buffer->target_node->cookie)
return true;
return false;
}
/**
* binder_find_outdated_transaction_ilocked() - Find the outdated transaction
* @t: new async transaction
* @target_list: list to find outdated transaction
*
* Return: the outdated transaction if found
* NULL if no outdated transacton can be found
*
* Requires the proc->inner_lock to be held.
*/
static struct binder_transaction *
binder_find_outdated_transaction_ilocked(struct binder_transaction *t,
struct list_head *target_list)
{
struct binder_work *w;
list_for_each_entry(w, target_list, entry) {
struct binder_transaction *t_queued;
if (w->type != BINDER_WORK_TRANSACTION)
continue;
t_queued = container_of(w, struct binder_transaction, work);
if (binder_can_update_transaction(t_queued, t))
return t_queued;
}
return NULL;
}
/**
* binder_proc_transaction() - sends a transaction to a process and wakes it up
* @t: transaction to send
* @proc: process to send the transaction to
* @thread: thread in @proc to send the transaction to (may be NULL)
*
* This function queues a transaction to the specified process. It will try
* to find a thread in the target process to handle the transaction and
* wake it up. If no thread is found, the work is queued to the proc
* waitqueue.
*
* If the @thread parameter is not NULL, the transaction is always queued
* to the waitlist of that specific thread.
*
* Return: 0 if the transaction was successfully queued
* BR_DEAD_REPLY if the target process or thread is dead
* BR_FROZEN_REPLY if the target process or thread is frozen and
* the sync transaction was rejected
* BR_TRANSACTION_PENDING_FROZEN if the target process is frozen
* and the async transaction was successfully queued
*/
static int binder_proc_transaction(struct binder_transaction *t,
struct binder_proc *proc,
struct binder_thread *thread)
{
struct binder_node *node = t->buffer->target_node;
bool oneway = !!(t->flags & TF_ONE_WAY);
bool pending_async = false;
struct binder_transaction *t_outdated = NULL;
bool frozen = false;
BUG_ON(!node);
binder_node_lock(node);
if (oneway) {
BUG_ON(thread);
if (node->has_async_transaction)
pending_async = true;
else
node->has_async_transaction = true;
}
binder_inner_proc_lock(proc);
if (proc->is_frozen) {
frozen = true;
proc->sync_recv |= !oneway;
proc->async_recv |= oneway;
}
if ((frozen && !oneway) || proc->is_dead ||
(thread && thread->is_dead)) {
binder_inner_proc_unlock(proc);
binder_node_unlock(node);
return frozen ? BR_FROZEN_REPLY : BR_DEAD_REPLY;
}
if (!thread && !pending_async)
thread = binder_select_thread_ilocked(proc);
if (thread) {
binder_enqueue_thread_work_ilocked(thread, &t->work);
} else if (!pending_async) {
binder_enqueue_work_ilocked(&t->work, &proc->todo);
} else {
if ((t->flags & TF_UPDATE_TXN) && frozen) {
t_outdated = binder_find_outdated_transaction_ilocked(t,
&node->async_todo);
if (t_outdated) {
binder_debug(BINDER_DEBUG_TRANSACTION,
"txn %d supersedes %d\n",
t->debug_id, t_outdated->debug_id);
list_del_init(&t_outdated->work.entry);
proc->outstanding_txns--;
}
}
binder_enqueue_work_ilocked(&t->work, &node->async_todo);
}
if (!pending_async)
binder_wakeup_thread_ilocked(proc, thread, !oneway /* sync */);
proc->outstanding_txns++;
binder_inner_proc_unlock(proc);
binder_node_unlock(node);
/*
* To reduce potential contention, free the outdated transaction and
* buffer after releasing the locks.
*/
if (t_outdated) {
struct binder_buffer *buffer = t_outdated->buffer;
t_outdated->buffer = NULL;
buffer->transaction = NULL;
trace_binder_transaction_update_buffer_release(buffer);
binder_release_entire_buffer(proc, NULL, buffer, false);
binder_alloc_free_buf(&proc->alloc, buffer);
kfree(t_outdated);
binder_stats_deleted(BINDER_STAT_TRANSACTION);
}
if (oneway && frozen)
return BR_TRANSACTION_PENDING_FROZEN;
return 0;
}
/**
* binder_get_node_refs_for_txn() - Get required refs on node for txn
* @node: struct binder_node for which to get refs
* @procp: returns @node->proc if valid
* @error: if no @procp then returns BR_DEAD_REPLY
*
* User-space normally keeps the node alive when creating a transaction
* since it has a reference to the target. The local strong ref keeps it
* alive if the sending process dies before the target process processes
* the transaction. If the source process is malicious or has a reference
* counting bug, relying on the local strong ref can fail.
*
* Since user-space can cause the local strong ref to go away, we also take
* a tmpref on the node to ensure it survives while we are constructing
* the transaction. We also need a tmpref on the proc while we are
* constructing the transaction, so we take that here as well.
*
* Return: The target_node with refs taken or NULL if no @node->proc is NULL.
* Also sets @procp if valid. If the @node->proc is NULL indicating that the
* target proc has died, @error is set to BR_DEAD_REPLY.
*/
static struct binder_node *binder_get_node_refs_for_txn(
struct binder_node *node,
struct binder_proc **procp,
uint32_t *error)
{
struct binder_node *target_node = NULL;
binder_node_inner_lock(node);
if (node->proc) {
target_node = node;
binder_inc_node_nilocked(node, 1, 0, NULL);
binder_inc_node_tmpref_ilocked(node);
node->proc->tmp_ref++;
*procp = node->proc;
} else
*error = BR_DEAD_REPLY;
binder_node_inner_unlock(node);
return target_node;
}
static void binder_set_txn_from_error(struct binder_transaction *t, int id,
uint32_t command, int32_t param)
{
struct binder_thread *from = binder_get_txn_from_and_acq_inner(t);
if (!from) {
/* annotation for sparse */
__release(&from->proc->inner_lock);
return;
}
/* don't override existing errors */
if (from->ee.command == BR_OK)
binder_set_extended_error(&from->ee, id, command, param);
binder_inner_proc_unlock(from->proc);
binder_thread_dec_tmpref(from);
}
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 *w;
struct binder_work *tcomplete;
binder_size_t buffer_offset = 0;
binder_size_t off_start_offset, off_end_offset;
binder_size_t off_min;
binder_size_t sg_buf_offset, sg_buf_end_offset;
binder_size_t user_offset = 0;
struct binder_proc *target_proc = NULL;
struct binder_thread *target_thread = NULL;
struct binder_node *target_node = NULL;
struct binder_transaction *in_reply_to = NULL;
struct binder_transaction_log_entry *e;
uint32_t return_error = 0;
uint32_t return_error_param = 0;
uint32_t return_error_line = 0;
binder_size_t last_fixup_obj_off = 0;
binder_size_t last_fixup_min_off = 0;
struct binder_context *context = proc->context;
int t_debug_id = atomic_inc_return(&binder_last_id);
ktime_t t_start_time = ktime_get();
char *secctx = NULL;
u32 secctx_sz = 0;
struct list_head sgc_head;
struct list_head pf_head;
const void __user *user_buffer = (const void __user *)
(uintptr_t)tr->data.ptr.buffer;
INIT_LIST_HEAD(&sgc_head);
INIT_LIST_HEAD(&pf_head);
e = binder_transaction_log_add(&binder_transaction_log);
e->debug_id = t_debug_id;
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;
strscpy(e->context_name, proc->context->name, BINDERFS_MAX_NAME);
binder_inner_proc_lock(proc);
binder_set_extended_error(&thread->ee, t_debug_id, BR_OK, 0);
binder_inner_proc_unlock(proc);
if (reply) {
binder_inner_proc_lock(proc);
in_reply_to = thread->transaction_stack;
if (in_reply_to == NULL) {
binder_inner_proc_unlock(proc);
binder_user_error("%d:%d got reply transaction with no transaction stack\n",
proc->pid, thread->pid);
return_error = BR_FAILED_REPLY;
return_error_param = -EPROTO;
return_error_line = __LINE__;
goto err_empty_call_stack;
}
if (in_reply_to->to_thread != thread) {
spin_lock(&in_reply_to->lock);
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);
spin_unlock(&in_reply_to->lock);
binder_inner_proc_unlock(proc);
return_error = BR_FAILED_REPLY;
return_error_param = -EPROTO;
return_error_line = __LINE__;
in_reply_to = NULL;
goto err_bad_call_stack;
}
thread->transaction_stack = in_reply_to->to_parent;
binder_inner_proc_unlock(proc);
binder_set_nice(in_reply_to->saved_priority);
target_thread = binder_get_txn_from_and_acq_inner(in_reply_to);
if (target_thread == NULL) {
/* annotation for sparse */
__release(&target_thread->proc->inner_lock);
binder_txn_error("%d:%d reply target not found\n",
thread->pid, proc->pid);
return_error = BR_DEAD_REPLY;
return_error_line = __LINE__;
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);
binder_inner_proc_unlock(target_thread->proc);
return_error = BR_FAILED_REPLY;
return_error_param = -EPROTO;
return_error_line = __LINE__;
in_reply_to = NULL;
target_thread = NULL;
goto err_dead_binder;
}
target_proc = target_thread->proc;
target_proc->tmp_ref++;
binder_inner_proc_unlock(target_thread->proc);
} else {
if (tr->target.handle) {
struct binder_ref *ref;
/*
* There must already be a strong ref
* on this node. If so, do a strong
* increment on the node to ensure it
* stays alive until the transaction is
* done.
*/
binder_proc_lock(proc);
ref = binder_get_ref_olocked(proc, tr->target.handle,
true);
if (ref) {
target_node = binder_get_node_refs_for_txn(
ref->node, &target_proc,
&return_error);
} else {
binder_user_error("%d:%d got transaction to invalid handle, %u\n",
proc->pid, thread->pid, tr->target.handle);
return_error = BR_FAILED_REPLY;
}
binder_proc_unlock(proc);
} else {
mutex_lock(&context->context_mgr_node_lock);
target_node = context->binder_context_mgr_node;
if (target_node)
target_node = binder_get_node_refs_for_txn(
target_node, &target_proc,
&return_error);
else
return_error = BR_DEAD_REPLY;
mutex_unlock(&context->context_mgr_node_lock);
if (target_node && target_proc->pid == proc->pid) {
binder_user_error("%d:%d got transaction to context manager from process owning it\n",
proc->pid, thread->pid);
return_error = BR_FAILED_REPLY;
return_error_param = -EINVAL;
return_error_line = __LINE__;
goto err_invalid_target_handle;
}
}
if (!target_node) {
binder_txn_error("%d:%d cannot find target node\n",
thread->pid, proc->pid);
/*
* return_error is set above
*/
return_error_param = -EINVAL;
return_error_line = __LINE__;
goto err_dead_binder;
}
e->to_node = target_node->debug_id;
if (WARN_ON(proc == target_proc)) {
binder_txn_error("%d:%d self transactions not allowed\n",
thread->pid, proc->pid);
return_error = BR_FAILED_REPLY;
return_error_param = -EINVAL;
return_error_line = __LINE__;
goto err_invalid_target_handle;
}
if (security_binder_transaction(proc->cred,
target_proc->cred) < 0) {
binder_txn_error("%d:%d transaction credentials failed\n",
thread->pid, proc->pid);
return_error = BR_FAILED_REPLY;
return_error_param = -EPERM;
return_error_line = __LINE__;
goto err_invalid_target_handle;
}
binder_inner_proc_lock(proc);
w = list_first_entry_or_null(&thread->todo,
struct binder_work, entry);
if (!(tr->flags & TF_ONE_WAY) && w &&
w->type == BINDER_WORK_TRANSACTION) {
/*
* Do not allow new outgoing transaction from a
* thread that has a transaction at the head of
* its todo list. Only need to check the head
* because binder_select_thread_ilocked picks a
* thread from proc->waiting_threads to enqueue
* the transaction, and nothing is queued to the
* todo list while the thread is on waiting_threads.
*/
binder_user_error("%d:%d new transaction not allowed when there is a transaction on thread todo\n",
proc->pid, thread->pid);
binder_inner_proc_unlock(proc);
return_error = BR_FAILED_REPLY;
return_error_param = -EPROTO;
return_error_line = __LINE__;
goto err_bad_todo_list;
}
if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
struct binder_transaction *tmp;
tmp = thread->transaction_stack;
if (tmp->to_thread != thread) {
spin_lock(&tmp->lock);
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);
spin_unlock(&tmp->lock);
binder_inner_proc_unlock(proc);
return_error = BR_FAILED_REPLY;
return_error_param