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Message-Id: <20210311184629.589725-4-dualli@chromium.org>
Date: Thu, 11 Mar 2021 10:46:29 -0800
From: Li Li <dualli@...omium.org>
To: dualli@...gle.com, tkjos@...gle.com, gregkh@...uxfoundation.org,
christian@...uner.io, arve@...roid.com, devel@...verdev.osuosl.org,
linux-kernel@...r.kernel.org, maco@...gle.com, hridya@...gle.com,
surenb@...gle.com
Cc: joel@...lfernandes.org, kernel-team@...roid.com
Subject: [PATCH v2 3/3] binder: BINDER_GET_FROZEN_INFO ioctl
From: Marco Ballesio <balejs@...gle.com>
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@...gle.com>
Signed-off-by: Li Li <dualli@...gle.com>
---
drivers/android/binder.c | 55 +++++++++++++++++++++++++++++
drivers/android/binder_internal.h | 6 ++++
include/uapi/linux/android/binder.h | 7 ++++
3 files changed, 68 insertions(+)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 38bbf9a4ce99..b4999ed04b2e 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)) {
@@ -4636,6 +4640,8 @@ 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;
@@ -4647,6 +4653,8 @@ 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);
@@ -4668,6 +4676,33 @@ 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;
@@ -4846,6 +4881,24 @@ 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;
@@ -5156,6 +5209,8 @@ 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;
diff --git a/include/uapi/linux/android/binder.h b/include/uapi/linux/android/binder.h
index 7eb5b818b3c1..156070d18c4f 100644
--- a/include/uapi/linux/android/binder.h
+++ b/include/uapi/linux/android/binder.h
@@ -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
--
2.31.0.rc2.261.g7f71774620-goog
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