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authorMarco Ballesio <balejs@google.com>2021-03-16 04:16:30 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-03-24 10:26:31 +0300
commitae28c1be1e54f2eda1c8b4469c4652e8a24056ed (patch)
tree064fcddd4945ff28d6504a3e64859017f7a45814 /drivers/android
parent95c16f9d9cf9db090ae16179f1f721284a6f3aef (diff)
downloadlinux-ae28c1be1e54f2eda1c8b4469c4652e8a24056ed.tar.xz
binder: BINDER_GET_FROZEN_INFO ioctl
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>
Diffstat (limited to 'drivers/android')
-rw-r--r--drivers/android/binder.c55
-rw-r--r--drivers/android/binder_internal.h6
2 files changed, 61 insertions, 0 deletions
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index fe16c455a76e..e1a484ab0366 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -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))) {
diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h
index e6a53e98c6da..2872a7de68e1 100644
--- a/drivers/android/binder_internal.h
+++ b/drivers/android/binder_internal.h
@@ -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;