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binder: BINDER_GET_FROZEN_INFO ioctl

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User space needs to know if binder transactions occurred to frozen
processes. Introduce a new BINDER_GET_FROZEN ioctl and keep track of
transactions occurring to frozen proceses.

Signed-off-by: Marco Ballesio <balejs@google.com>
Signed-off-by: Li Li <dualli@google.com>
Acked-by: Todd Kjos <tkjos@google.com>
Link: https://lore.kernel.org/r/20210316011630.1121213-4-dualli@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marco Ballesio 2021-03-15 18:16:30 -07:00 • committed by Greg Kroah-Hartman
parent 95c16f9d9c
commit ae28c1be1e
3 changed files with 68 additions and 0 deletions
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55
drivers/android/binder.c
View file

@ -2360,6 +2360,10 @@ static int binder_proc_transaction(struct binder_transaction *t,
}
binder_inner_proc_lock(proc);
if (proc->is_frozen) {
proc->sync_recv |= !oneway;
proc->async_recv |= oneway;
}
if ((proc->is_frozen && !oneway) || proc->is_dead ||
(thread && thread->is_dead)) {
@ -4634,6 +4638,8 @@ static int binder_ioctl_freeze(struct binder_freeze_info *info,
if (!info->enable) {
binder_inner_proc_lock(target_proc);
target_proc->sync_recv = false;
target_proc->async_recv = false;
target_proc->is_frozen = false;
binder_inner_proc_unlock(target_proc);
return 0;
@ -4645,6 +4651,8 @@ static int binder_ioctl_freeze(struct binder_freeze_info *info,
* for transactions to drain.
*/
binder_inner_proc_lock(target_proc);
target_proc->sync_recv = false;
target_proc->async_recv = false;
target_proc->is_frozen = true;
binder_inner_proc_unlock(target_proc);
@ -4666,6 +4674,33 @@ static int binder_ioctl_freeze(struct binder_freeze_info *info,
return ret;
}
static int binder_ioctl_get_freezer_info(
struct binder_frozen_status_info *info)
{
struct binder_proc *target_proc;
bool found = false;
info->sync_recv = 0;
info->async_recv = 0;
mutex_lock(&binder_procs_lock);
hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
if (target_proc->pid == info->pid) {
found = true;
binder_inner_proc_lock(target_proc);
info->sync_recv |= target_proc->sync_recv;
info->async_recv |= target_proc->async_recv;
binder_inner_proc_unlock(target_proc);
}
}
mutex_unlock(&binder_procs_lock);
if (!found)
return -EINVAL;
return 0;
}
static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
int ret;
@ -4844,6 +4879,24 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
goto err;
break;
}
case BINDER_GET_FROZEN_INFO: {
struct binder_frozen_status_info info;
if (copy_from_user(&info, ubuf, sizeof(info))) {
ret = -EFAULT;
goto err;
}
ret = binder_ioctl_get_freezer_info(&info);
if (ret < 0)
goto err;
if (copy_to_user(ubuf, &info, sizeof(info))) {
ret = -EFAULT;
goto err;
}
break;
}
default:
ret = -EINVAL;
goto err;
@ -5154,6 +5207,8 @@ static void binder_deferred_release(struct binder_proc *proc)
proc->is_dead = true;
proc->is_frozen = false;
proc->sync_recv = false;
proc->async_recv = false;
threads = 0;
active_transactions = 0;
while ((n = rb_first(&proc->threads))) {

6
drivers/android/binder_internal.h
View file

@ -376,6 +376,10 @@ struct binder_ref {
* @is_frozen: process is frozen and unable to service
* binder transactions
* (protected by @inner_lock)
* @sync_recv: process received sync transactions since last frozen
* (protected by @inner_lock)
* @async_recv: process received async transactions since last frozen
* (protected by @inner_lock)
* @freeze_wait: waitqueue of processes waiting for all outstanding
* transactions to be processed
* (protected by @inner_lock)
@ -422,6 +426,8 @@ struct binder_proc {
int outstanding_txns;
bool is_dead;
bool is_frozen;
bool sync_recv;
bool async_recv;
wait_queue_head_t freeze_wait;
struct list_head todo;

7
include/uapi/linux/android/binder.h
View file

@ -223,6 +223,12 @@ struct binder_freeze_info {
__u32 timeout_ms;
};
struct binder_frozen_status_info {
__u32 pid;
__u32 sync_recv;
__u32 async_recv;
};
#define BINDER_WRITE_READ _IOWR('b', 1, struct binder_write_read)
#define BINDER_SET_IDLE_TIMEOUT _IOW('b', 3, __s64)
#define BINDER_SET_MAX_THREADS _IOW('b', 5, __u32)
@ -234,6 +240,7 @@ struct binder_freeze_info {
#define BINDER_GET_NODE_INFO_FOR_REF _IOWR('b', 12, struct binder_node_info_for_ref)
#define BINDER_SET_CONTEXT_MGR_EXT _IOW('b', 13, struct flat_binder_object)
#define BINDER_FREEZE _IOW('b', 14, struct binder_freeze_info)
#define BINDER_GET_FROZEN_INFO _IOWR('b', 15, struct binder_frozen_status_info)
/*
* NOTE: Two special error codes you should check for when calling