In the Linux kernel, the following vulnerability has been resolved:
driver core: fix deadlock in __device_attach
In __device_attach function, The lock holding logic is as follows:
...
__device_attach
device_lock(dev) // get lock dev
async_schedule_dev(__device_attach_async_helper, dev); // func
async_schedule_node
async_schedule_node_domain(func)
entry = kzalloc(sizeof(struct async_entry), GFP_ATOMIC);
/* when fail or work limit, sync to execute func, but
__device_attach_async_helper will get lock dev as
well, which will lead to A-A deadlock. */
if (!entry || atomic_read(&entry_count) > MAX_WORK) {
func;
else
queue_work_node(node, system_unbound_wq, &entry->work)
device_unlock(dev)
As shown above, when it is allowed to do async probes, because of
out of memory or work limit, async work is not allowed, to do
sync execute instead. it will lead to A-A deadlock because of
__device_attach_async_helper getting lock dev.
To fix the deadlock, move the async_schedule_dev outside device_lock,
as we can see, in async_schedule_node_domain, the parameter of
queue_work_node is system_unbound_wq, so it can accept concurrent
operations. which will also not change the code logic, and will
not lead to deadlock.
References
Configurations
Configuration 1 (hide)
|
History
14 Apr 2025, 20:43
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CWE | CWE-667 | |
| Summary |
|
|
| First Time |
Linux linux Kernel
Linux |
|
| References | () https://git.kernel.org/stable/c/34fdd9b7def9d2fcb71bb7b0bc4848dd7313767e - Patch | |
| References | () https://git.kernel.org/stable/c/36ee9ffca8ef56c302f2855c4a5fccf61c0c1ada - Patch | |
| References | () https://git.kernel.org/stable/c/593b595332bd2d65e1a5c1ae7897996c157f5468 - Patch | |
| References | () https://git.kernel.org/stable/c/b232b02bf3c205b13a26dcec08e53baddd8e59ed - Patch | |
| References | () https://git.kernel.org/stable/c/d53a227bfcd5160ce1b61d9954901968a20651e7 - Patch | |
| References | () https://git.kernel.org/stable/c/df6de52b80aa3b46f5ac804412355ffe2e1df93e - Patch |
26 Feb 2025, 07:01
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-02-26 07:01
Updated : 2025-04-14 20:43
NVD link : CVE-2022-49371
Mitre link : CVE-2022-49371
CVE.ORG link : CVE-2022-49371
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-667
Improper Locking