CVE-2024-27036 (GCVE-0-2024-27036)

Vulnerability from cvelistv5 – Published: 2024-05-01 12:53 – Updated: 2025-05-04 09:02
VLAI?
Title
cifs: Fix writeback data corruption
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: Fix writeback data corruption cifs writeback doesn't correctly handle the case where cifs_extend_writeback() hits a point where it is considering an additional folio, but this would overrun the wsize - at which point it drops out of the xarray scanning loop and calls xas_pause(). The problem is that xas_pause() advances the loop counter - thereby skipping that page. What needs to happen is for xas_reset() to be called any time we decide we don't want to process the page we're looking at, but rather send the request we are building and start a new one. Fix this by copying and adapting the netfslib writepages code as a temporary measure, with cifs writeback intending to be offloaded to netfslib in the near future. This also fixes the issue with the use of filemap_get_folios_tag() causing retry of a bunch of pages which the extender already dealt with. This can be tested by creating, say, a 64K file somewhere not on cifs (otherwise copy-offload may get underfoot), mounting a cifs share with a wsize of 64000, copying the file to it and then comparing the original file and the copy: dd if=/dev/urandom of=/tmp/64K bs=64k count=1 mount //192.168.6.1/test /mnt -o user=...,pass=...,wsize=64000 cp /tmp/64K /mnt/64K cmp /tmp/64K /mnt/64K Without the fix, the cmp fails at position 64000 (or shortly thereafter).
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < e45deec35bf7f1f4f992a707b2d04a8c162f2240 (git)
Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < 65f2ced695982ccd516196d0a9447d85dbe2eed5 (git)
Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < 844b4e132f57f1333dc79feaa035075a096762e4 (git)
Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < f3dc1bdb6b0b0693562c7c54a6c28bafa608ba3c (git)
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    Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.6.23 , ≤ 6.6.* (semver)
Unaffected: 6.7.11 , ≤ 6.7.* (semver)
Unaffected: 6.8.2 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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