Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: block: fix queue freeze vs limits lock order in sysfs store methods queue_attr_store() always freezes a device queue before calling the attribute store operation. For attributes that control queue limits, the store operation will also lock the queue limits with a call to queue_limits_start_update(). However, some drivers (e.g. SCSI sd) may need to issue commands to a device to obtain limit values from the hardware with the queue limits locked. This creates a potential ABBA deadlock situation if a user attempts to modify a limit (thus freezing the device queue) while the device driver starts a revalidation of the device queue limits. Avoid such deadlock by not freezing the queue before calling the ->store_limit() method in struct queue_sysfs_entry and instead use the queue_limits_commit_update_frozen helper to freeze the queue after taking the limits lock. This also removes taking the sysfs lock for the store_limit method as it doesn't protect anything here, but creates even more nesting. Hopefully it will go away from the actual sysfs methods entirely soon. (commit log adapted from a similar patch from Damien Le Moal)
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0327ca9d53bfbb0918867313049bba7046900f73 before 1645cd7fd42c236c952e9228badcac4fea1829ea; affected 0327ca9d53bfbb0918867313049bba7046900f73 before 8985da5481562e96b95e94ed8e5cc9b6565eb82b; affected 0327ca9d53bfbb0918867313049bba7046900f73 before c99f66e4084a62a2cc401c4704a84328aeddc9ec |
| Linux / Linux | affected 6.9; unaffected 0 before 6.9; unaffected 6.12.96 through 6.12.*; unaffected 6.13.2 through 6.13.*; unaffected 6.14 through * |
CWE
No CWE identifiers supplied.