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'.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-04-17T10:27:49.089Z

Updated: 2024-11-05T09:17:51.908Z

Reserved: 2024-02-19T14:20:24.187Z

Link: CVE-2024-26899

cve-icon Vulnrichment

Updated: 2024-08-02T00:21:05.535Z

cve-icon NVD

Status : Analyzed

Published: 2024-04-17T11:15:10.870

Modified: 2024-04-29T19:34:10.080

Link: CVE-2024-26899

cve-icon Redhat

Severity : Moderate

Publid Date: 2024-04-17T00:00:00Z

Links: CVE-2024-26899 - Bugzilla