Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: block: fix deadlock between bd_link_disk_holder and partition scan 'open_mutex' of gendisk is used to protect open/close block devices. But in bd_link_disk_holder(), it is used to protect the creation of symlink between holding disk and slave bdev, which introduces some issues. When bd_link_disk_holder() is called, the driver is usually in the process of initialization/modification and may suspend submitting io. At this time, any io hold 'open_mutex', such as scanning partitions, can cause deadlocks. For example, in raid: T1 T2 bdev_open_by_dev lock open_mutex [1] ... efi_partition ... md_submit_bio md_ioctl mddev_syspend -> suspend all io md_add_new_disk bind_rdev_to_array bd_link_disk_holder try lock open_mutex [2] md_handle_request -> wait mddev_resume T1 scan partition, T2 add a new device to raid. T1 waits for T2 to resume mddev, but T2 waits for open_mutex held by T1. Deadlock occurs. Fix it by introducing a local mutex 'blk_holder_mutex' to replace 'open_mutex'.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1b0a2d950ee2a54aa04fb31ead32144be0bbf690 before 1e5c5b0abaee7b62a10b9707a62083b71ad21f62; affected 1b0a2d950ee2a54aa04fb31ead32144be0bbf690 before 5a87c1f7993bc8ac358a3766bac5dc7126e01e98; affected 1b0a2d950ee2a54aa04fb31ead32144be0bbf690 before 03f12122b20b6e6028e9ed69030a49f9cffcbb75 |
| Linux / Linux | affected 6.7; unaffected 0 before 6.7; unaffected 6.7.11 through 6.7.*; unaffected 6.8.2 through 6.8.*; unaffected 6.9 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/1e5c5b0abaee7b62a10b9707a62083b71ad21f62
- https://git.kernel.org/stable/c/5a87c1f7993bc8ac358a3766bac5dc7126e01e98
- https://git.kernel.org/stable/c/03f12122b20b6e6028e9ed69030a49f9cffcbb75
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.