漏洞标题
ksmbd：修复警告“在! TASK_RUNNING时不要调用阻塞操作”
漏洞描述信息
## 概述
在Linux内核中，解决了一个名为"do not call blocking ops when !TASK_RUNNING"的警告漏洞。`wait_event_timeout()` 函数在检查条件前会将当前任务设置为 `TASK_UNINTERRUPTIBLE` 状态，这导致 `ksmbd_durable_scavenger_alive()` 在非运行状态尝试获取互斥锁，触发内核警告。
## 影响版本
未明确指定具体影响的Linux内核版本。
## 细节
`wait_event_timeout()` 在执行条件检查前将当前任务状态设置为 `TASK_UNINTERRUPTIBLE` 状态。因此，`ksmbd_durable_scavenger_alive()` 在尝试获取互斥锁时已经是睡眠状态。调度器通过以下警告提示存在问题：
```
do not call blocking ops when !TASK_RUNNING; state=2 set at
[<0000000061515a6f>] prepare_to_wait_event+0x9f/0x6c0
WARNING: CPU: 2 PID: 4147 at kernel/sched/core.c:10099 __might_sleep+0x12f/0x160
```
`ksmbd_durable_scavenger_alive()` 中的互斥锁定实际是不必要的。
## 影响
此漏洞可能导致内核在非运行（非`TASK_RUNNING`）状态下调用阻塞操作，进而触发警告信息。
CVSS信息
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
漏洞类别
对异常条件的处理不恰当
漏洞标题
ksmbd: fix WARNING "do not call blocking ops when !TASK_RUNNING"
漏洞描述信息
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix WARNING "do not call blocking ops when !TASK_RUNNING"
wait_event_timeout() will set the state of the current
task to TASK_UNINTERRUPTIBLE, before doing the condition check. This
means that ksmbd_durable_scavenger_alive() will try to acquire the mutex
while already in a sleeping state. The scheduler warns us by giving
the following warning:
do not call blocking ops when !TASK_RUNNING; state=2 set at
[<0000000061515a6f>] prepare_to_wait_event+0x9f/0x6c0
WARNING: CPU: 2 PID: 4147 at kernel/sched/core.c:10099 __might_sleep+0x12f/0x160
mutex lock is not needed in ksmbd_durable_scavenger_alive().
CVSS信息
N/A
漏洞类别
N/A