CVE-2024-26899 (GCVE-0-2024-26899)
Vulnerability from cvelistv5
Published
2024-04-17 10:27
Modified
2026-05-11 20:06
Severity ?
Summary
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'.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1b0a2d950ee2a54aa04fb31ead32144be0bbf690
Version: 1b0a2d950ee2a54aa04fb31ead32144be0bbf690
Version: 1b0a2d950ee2a54aa04fb31ead32144be0bbf690
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