cve-2024-27036
Vulnerability from cvelistv5
Published
2024-05-01 12:53
Modified
2024-11-05 09:20
Severity ?
Summary
cifs: Fix writeback data corruption
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/65f2ced695982ccd516196d0a9447d85dbe2eed5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/844b4e132f57f1333dc79feaa035075a096762e4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e45deec35bf7f1f4f992a707b2d04a8c162f2240
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f3dc1bdb6b0b0693562c7c54a6c28bafa608ba3c
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/65f2ced695982ccd516196d0a9447d85dbe2eed5
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/844b4e132f57f1333dc79feaa035075a096762e4
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e45deec35bf7f1f4f992a707b2d04a8c162f2240
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f3dc1bdb6b0b0693562c7c54a6c28bafa608ba3c
Impacted products
Vendor Product Version
Linux Linux Version: 6.3
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix writeback data corruption\n\ncifs writeback doesn\u0027t correctly handle the case where\ncifs_extend_writeback() hits a point where it is considering an additional\nfolio, but this would overrun the wsize - at which point it drops out of\nthe xarray scanning loop and calls xas_pause().  The problem is that\nxas_pause() advances the loop counter - thereby skipping that page.\n\nWhat needs to happen is for xas_reset() to be called any time we decide we\ndon\u0027t want to process the page we\u0027re looking at, but rather send the\nrequest we are building and start a new one.\n\nFix this by copying and adapting the netfslib writepages code as a\ntemporary measure, with cifs writeback intending to be offloaded to\nnetfslib in the near future.\n\nThis also fixes the issue with the use of filemap_get_folios_tag() causing\nretry of a bunch of pages which the extender already dealt with.\n\nThis can be tested by creating, say, a 64K file somewhere not on cifs\n(otherwise copy-offload may get underfoot), mounting a cifs share with a\nwsize of 64000, copying the file to it and then comparing the original file\nand the copy:\n\n        dd if=/dev/urandom of=/tmp/64K bs=64k count=1\n        mount //192.168.6.1/test /mnt -o user=...,pass=...,wsize=64000\n        cp /tmp/64K /mnt/64K\n        cmp /tmp/64K /mnt/64K\n\nWithout the fix, the cmp fails at position 64000 (or shortly thereafter)."
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}


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