CVE - CVE-2024-56780

CVE-ID
CVE-2024-56780	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: quota: flush quota_release_work upon quota writeback One of the paths quota writeback is called from is: freeze_super() sync_filesystem() ext4_sync_fs() dquot_writeback_dquots() Since we currently don't always flush the quota_release_work queue in this path, we can end up with the following race: 1. dquot are added to releasing_dquots list during regular operations. 2. FS Freeze starts, however, this does not flush the quota_release_work queue. 3. Freeze completes. 4. Kernel eventually tries to flush the workqueue while FS is frozen which hits a WARN_ON since transaction gets started during frozen state: ext4_journal_check_start+0x28/0x110 [ext4] (unreliable) __ext4_journal_start_sb+0x64/0x1c0 [ext4] ext4_release_dquot+0x90/0x1d0 [ext4] quota_release_workfn+0x43c/0x4d0 Which is the following line: WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE); Which ultimately results in generic/390 failing due to dmesg noise. This was detected on powerpc machine 15 cores. To avoid this, make sure to flush the workqueue during dquot_writeback_dquots() so we dont have any pending workitems after freeze.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb URL:https://git.kernel.org/stable/c/3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb MISC:https://git.kernel.org/stable/c/6f3821acd7c3143145999248087de5fb4b48cf26 URL:https://git.kernel.org/stable/c/6f3821acd7c3143145999248087de5fb4b48cf26 MISC:https://git.kernel.org/stable/c/8ea87e34792258825d290f4dc5216276e91cb224 URL:https://git.kernel.org/stable/c/8ea87e34792258825d290f4dc5216276e91cb224 MISC:https://git.kernel.org/stable/c/a5abba5e0e586e258ded3e798fe5f69c66fec198 URL:https://git.kernel.org/stable/c/a5abba5e0e586e258ded3e798fe5f69c66fec198 MISC:https://git.kernel.org/stable/c/ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb URL:https://git.kernel.org/stable/c/ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb MISC:https://git.kernel.org/stable/c/ac6f420291b3fee1113f21d612fa88b628afab5b URL:https://git.kernel.org/stable/c/ac6f420291b3fee1113f21d612fa88b628afab5b MISC:https://git.kernel.org/stable/c/bcacb52a985f1b6d280f698a470b873dfe52728a URL:https://git.kernel.org/stable/c/bcacb52a985f1b6d280f698a470b873dfe52728a
Assigning CNA
kernel.org
Date Record Created
20241229	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241229)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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