Bug 1227895 (CVE-2024-40969) - VUL-0: CVE-2024-40969: kernel: f2fs: don't set RO when shutting down f2fs
Summary: VUL-0: CVE-2024-40969: kernel: f2fs: don't set RO when shutting down f2fs
Status: NEW
Alias: CVE-2024-40969
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents (show other bugs)
Version: unspecified
Hardware: Other Other
: P3 - Medium : Normal
Target Milestone: ---
Assignee: Security Team bot
QA Contact: Security Team bot
URL: https://smash.suse.de/issue/413896/
Whiteboard: CVSSv3.1:SUSE:CVE-2024-40969:4.1:(AV:...
Keywords:
Depends on:
Blocks:
 
Reported: 2024-07-16 08:50 UTC by SMASH SMASH
Modified: 2024-07-19 16:50 UTC (History)
2 users (show)

See Also:
Found By: Security Response Team
Services Priority:
Business Priority:
Blocker: ---
Marketing QA Status: ---
IT Deployment: ---

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Description SMASH SMASH 2024-07-16 08:50:02 UTC 
In the Linux kernel, the following vulnerability has been resolved:

f2fs: don't set RO when shutting down f2fs

Shutdown does not check the error of thaw_super due to readonly, which
causes a deadlock like below.

f2fs_ioc_shutdown(F2FS_GOING_DOWN_FULLSYNC)        issue_discard_thread
 - bdev_freeze
  - freeze_super
 - f2fs_stop_checkpoint()
  - f2fs_handle_critical_error                     - sb_start_write
    - set RO                                         - waiting
 - bdev_thaw
  - thaw_super_locked
    - return -EINVAL, if sb_rdonly()
 - f2fs_stop_discard_thread
  -> wait for kthread_stop(discard_thread);

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-40969
https://www.cve.org/CVERecord?id=CVE-2024-40969
https://git.kernel.org/stable/c/1036d3ea7a32cb7cee00885c73a1f2ba7fbc499a
https://git.kernel.org/stable/c/3bdb7f161697e2d5123b89fe1778ef17a44858e7
https://git.kernel.org/stable/c/f47ed3b284b38f235355e281f57dfa8fffcc6563
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-40969.mbox
Comment 1 Miroslav Franc 2024-07-19 16:41:17 UTC 
Fixes: b62e71be2110
Comment 3 Miroslav Franc 2024-07-19 16:50:06 UTC 
We don't enable f2fs.