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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
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cve-2024-26956
Vulnerability from cvelistv5
Published
2024-05-01 05:18
Modified
2024-12-19 08:51
Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
nilfs2: fix failure to detect DAT corruption in btree and direct mappings
Patch series "nilfs2: fix kernel bug at submit_bh_wbc()".
This resolves a kernel BUG reported by syzbot. Since there are two
flaws involved, I've made each one a separate patch.
The first patch alone resolves the syzbot-reported bug, but I think
both fixes should be sent to stable, so I've tagged them as such.
This patch (of 2):
Syzbot has reported a kernel bug in submit_bh_wbc() when writing file data
to a nilfs2 file system whose metadata is corrupted.
There are two flaws involved in this issue.
The first flaw is that when nilfs_get_block() locates a data block using
btree or direct mapping, if the disk address translation routine
nilfs_dat_translate() fails with internal code -ENOENT due to DAT metadata
corruption, it can be passed back to nilfs_get_block(). This causes
nilfs_get_block() to misidentify an existing block as non-existent,
causing both data block lookup and insertion to fail inconsistently.
The second flaw is that nilfs_get_block() returns a successful status in
this inconsistent state. This causes the caller __block_write_begin_int()
or others to request a read even though the buffer is not mapped,
resulting in a BUG_ON check for the BH_Mapped flag in submit_bh_wbc()
failing.
This fixes the first issue by changing the return value to code -EINVAL
when a conversion using DAT fails with code -ENOENT, avoiding the
conflicting condition that leads to the kernel bug described above. Here,
code -EINVAL indicates that metadata corruption was detected during the
block lookup, which will be properly handled as a file system error and
converted to -EIO when passing through the nilfs2 bmap layer.
References
Impacted products
| Vendor | Product | Version | |||||
|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: c3a7abf06ce719a51139e62a034590be99abbc2c Version: c3a7abf06ce719a51139e62a034590be99abbc2c Version: c3a7abf06ce719a51139e62a034590be99abbc2c Version: c3a7abf06ce719a51139e62a034590be99abbc2c Version: c3a7abf06ce719a51139e62a034590be99abbc2c Version: c3a7abf06ce719a51139e62a034590be99abbc2c Version: c3a7abf06ce719a51139e62a034590be99abbc2c Version: c3a7abf06ce719a51139e62a034590be99abbc2c Version: c3a7abf06ce719a51139e62a034590be99abbc2c |
||||
|
|||||||
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.