CVE-2024-56780 (GCVE-0-2024-56780)
Vulnerability from cvelistv5
Published
2025-01-08 17:49
Modified
2026-05-23 15:56
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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
Impacted products
Vendor Product Version
Linux Linux Version: d40c192e119892799dd4ddf94f5cea6fa93775ef
Version: 86d89987f0998c98f57d641e308b40452a994045
Version: 89602de9a2d7080b7a4029d5c1bf8f78d295ff5f
Version: 3027e200dd58d5b437f16634dbbd355b29ffe0a6
Version: dabc8b20756601b9e1cc85a81d47d3f98ed4d13a
Version: dabc8b20756601b9e1cc85a81d47d3f98ed4d13a
Version: dabc8b20756601b9e1cc85a81d47d3f98ed4d13a
Version: f3e9a2bbdeb8987508dd6bb2b701dea911d4daec
Version: 903fc5d8cb48b0d2de7095ef40e39fd32bb27bd0
Version: 31bed65eecbc5ce57592cfe31947eaa64e3d678e
Version: 5.4.257   ≤
Version: 5.10.195   ≤
Version: 5.15.132   ≤
Version: 6.1.53   ≤
Version: 4.19.295   ≤
Version: 6.4.16   ≤
Version: 6.5.3   ≤
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nquota: flush quota_release_work upon quota writeback\n\nOne of the paths quota writeback is called from is:\n\nfreeze_super()\n  sync_filesystem()\n    ext4_sync_fs()\n      dquot_writeback_dquots()\n\nSince we currently don\u0027t always flush the quota_release_work queue in\nthis path, we can end up with the following race:\n\n 1. dquot are added to releasing_dquots list during regular operations.\n 2. FS Freeze starts, however, this does not flush the quota_release_work queue.\n 3. Freeze completes.\n 4. Kernel eventually tries to flush the workqueue while FS is frozen which\n    hits a WARN_ON since transaction gets started during frozen state:\n\n  ext4_journal_check_start+0x28/0x110 [ext4] (unreliable)\n  __ext4_journal_start_sb+0x64/0x1c0 [ext4]\n  ext4_release_dquot+0x90/0x1d0 [ext4]\n  quota_release_workfn+0x43c/0x4d0\n\nWhich is the following line:\n\n  WARN_ON(sb-\u003es_writers.frozen == SB_FREEZE_COMPLETE);\n\nWhich ultimately results in generic/390 failing due to dmesg\nnoise. This was detected on powerpc machine 15 cores.\n\nTo avoid this, make sure to flush the workqueue during\ndquot_writeback_dquots() so we dont have any pending workitems after\nfreeze."
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    "cveId": "CVE-2024-56780",
    "datePublished": "2025-01-08T17:49:17.889Z",
    "dateReserved": "2024-12-29T11:26:39.768Z",
    "dateUpdated": "2026-05-23T15:56:03.580Z",
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