CVE-2024-27036
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2024-27036
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-27036.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2024-27036
- Downstream
- Related
- Published
- 2024-05-01T12:53:46Z
- Modified
- 2025-10-21T20:44:37.720204Z
- Summary
- cifs: Fix writeback data corruption
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
cifs: Fix writeback data corruption
cifs writeback doesn't correctly handle the case where cifsextendwriteback() 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 xaspause(). The problem is that xaspause() 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 filemapgetfolios_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/64KWithout the fix, the cmp fails at position 64000 (or shortly thereafter).
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/65f2ced695982ccd516196d0a9447d85dbe2eed5
- https://git.kernel.org/stable/c/844b4e132f57f1333dc79feaa035075a096762e4
- https://git.kernel.org/stable/c/e45deec35bf7f1f4f992a707b2d04a8c162f2240
- https://git.kernel.org/stable/c/f3dc1bdb6b0b0693562c7c54a6c28bafa608ba3c
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd08089f649a0cfb2099c8551ac47eef0cc23fdf2Fixede45deec35bf7f1f4f992a707b2d04a8c162f2240
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd08089f649a0cfb2099c8551ac47eef0cc23fdf2Fixed65f2ced695982ccd516196d0a9447d85dbe2eed5
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd08089f649a0cfb2099c8551ac47eef0cc23fdf2Fixed844b4e132f57f1333dc79feaa035075a096762e4
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd08089f649a0cfb2099c8551ac47eef0cc23fdf2Fixedf3dc1bdb6b0b0693562c7c54a6c28bafa608ba3c