CVE-2024-56780: quota: flush quota_release_work upon quota writeback
First published: Wed Jan 08 2025(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=4.19.295<4.20 | |
| Linux Kernel | >=5.4.257<5.4.287 | |
| Linux Kernel | >=5.10.195<5.10.231 | |
| Linux Kernel | >=5.15.132<5.15.174 | |
| Linux Kernel | >=6.1.53<6.1.120 | |
| Linux Kernel | >=6.4.16<6.5 | |
| Linux Kernel | >=6.5.3<6.6.64 | |
| Linux Kernel | >=6.7<6.12.4 | |
| Linux Kernel | =6.13-rc1 | |
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.133-1 6.12.22-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/a5abba5e0e586e258ded3e798fe5f69c66fec198
- https://git.kernel.org/stable/c/6f3821acd7c3143145999248087de5fb4b48cf26
- https://git.kernel.org/stable/c/ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb
- https://git.kernel.org/stable/c/3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb
- https://git.kernel.org/stable/c/bcacb52a985f1b6d280f698a470b873dfe52728a
- https://git.kernel.org/stable/c/8ea87e34792258825d290f4dc5216276e91cb224
- https://git.kernel.org/stable/c/ac6f420291b3fee1113f21d612fa88b628afab5b
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56780
- https://nvd.nist.gov/vuln/detail/CVE-2024-56780
- https://launchpad.net/bugs/cve/CVE-2024-56780
- https://security-tracker.debian.org/tracker/CVE-2024-56780
- https://ubuntu.com/security/CVE-2024-56780
- https://git.kernel.org/linus/ac6f420291b3fee1113f21d612fa88b628afab5b
Frequently Asked Questions
What is the severity of CVE-2024-56780?
CVE-2024-56780 is categorized with a high severity rating due to its potential impact on system stability and security.
How do I fix CVE-2024-56780?
To fix CVE-2024-56780, you should upgrade to a patched version of the Linux kernel that addresses this vulnerability.
What versions of Linux kernel are affected by CVE-2024-56780?
CVE-2024-56780 affects multiple versions of the Linux kernel, specifically those between 4.19.295 and 4.20, and also various ranges starting from 5.4.257 to 6.12.4.
What type of vulnerability is CVE-2024-56780 classified as?
CVE-2024-56780 is classified as a kernel vulnerability associated with the quota writeback functionality in the Linux kernel.
Is there any workaround for CVE-2024-56780 before applying the patch?
Currently, there are no known workarounds for CVE-2024-56780, so upgrading to a secure version is essential.
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