gsd - gsd-2024-26956

gsd-2024-26956

Vulnerability from gsd

Modified

2024-02-20 06:02

Details

** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.

Aliases

CVE-2024-26956

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{
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      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
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}

cve-2024-26956

Vulnerability from cvelistv5

Published

2024-05-01 05:18

Modified

2024-11-05 09:18

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

nilfs2: fix failure to detect DAT corruption in btree and direct mappings

References

▼	URL	Tags
	https://git.kernel.org/stable/c/b67189690eb4b7ecc84ae16fa1e880e0123eaa35
	https://git.kernel.org/stable/c/9cbe1ad5f4354f4df1445e5f4883983328cd6d8e
	https://git.kernel.org/stable/c/c3b5c5c31e723b568f83d8cafab8629d9d830ffb
	https://git.kernel.org/stable/c/2e2619ff5d0def4bb6c2037a32a6eaa28dd95c84
	https://git.kernel.org/stable/c/46b832e09d43b394ac0f6d9485d2b1a06593f0b7
	https://git.kernel.org/stable/c/f69e81396aea66304d214f175aa371f1b5578862
	https://git.kernel.org/stable/c/a8e4d098de1c0f4c5c1f2ed4633a860f0da6d713
	https://git.kernel.org/stable/c/82827ca21e7c8a91384c5baa656f78a5adfa4ab4
	https://git.kernel.org/stable/c/f2f26b4a84a0ef41791bd2d70861c8eac748f4ba

Impacted products

▼	Vendor	Product
	Linux	Linux
	Linux	Linux

Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix failure to detect DAT corruption in btree and direct mappings\n\nPatch series \"nilfs2: fix kernel bug at submit_bh_wbc()\".\n\nThis resolves a kernel BUG reported by syzbot.  Since there are two\nflaws involved, I\u0027ve made each one a separate patch.\n\nThe first patch alone resolves the syzbot-reported bug, but I think\nboth fixes should be sent to stable, so I\u0027ve tagged them as such.\n\n\nThis patch (of 2):\n\nSyzbot has reported a kernel bug in submit_bh_wbc() when writing file data\nto a nilfs2 file system whose metadata is corrupted.\n\nThere are two flaws involved in this issue.\n\nThe first flaw is that when nilfs_get_block() locates a data block using\nbtree or direct mapping, if the disk address translation routine\nnilfs_dat_translate() fails with internal code -ENOENT due to DAT metadata\ncorruption, it can be passed back to nilfs_get_block().  This causes\nnilfs_get_block() to misidentify an existing block as non-existent,\ncausing both data block lookup and insertion to fail inconsistently.\n\nThe second flaw is that nilfs_get_block() returns a successful status in\nthis inconsistent state.  This causes the caller __block_write_begin_int()\nor others to request a read even though the buffer is not mapped,\nresulting in a BUG_ON check for the BH_Mapped flag in submit_bh_wbc()\nfailing.\n\nThis fixes the first issue by changing the return value to code -EINVAL\nwhen a conversion using DAT fails with code -ENOENT, avoiding the\nconflicting condition that leads to the kernel bug described above.  Here,\ncode -EINVAL indicates that metadata corruption was detected during the\nblock lookup, which will be properly handled as a file system error and\nconverted to -EIO when passing through the nilfs2 bmap layer."
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