CVE-2024-35798 (GCVE-0-2024-35798)

Vulnerability from cvelistv5 – Published: 2024-05-17 13:23 – Updated: 2025-05-04 09:05
VLAI?
Title
btrfs: fix race in read_extent_buffer_pages()
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix race in read_extent_buffer_pages() There are reports from tree-checker that detects corrupted nodes, without any obvious pattern so possibly an overwrite in memory. After some debugging it turns out there's a race when reading an extent buffer the uptodate status can be missed. To prevent concurrent reads for the same extent buffer, read_extent_buffer_pages() performs these checks: /* (1) */ if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) return 0; /* (2) */ if (test_and_set_bit(EXTENT_BUFFER_READING, &eb->bflags)) goto done; At this point, it seems safe to start the actual read operation. Once that completes, end_bbio_meta_read() does /* (3) */ set_extent_buffer_uptodate(eb); /* (4) */ clear_bit(EXTENT_BUFFER_READING, &eb->bflags); Normally, this is enough to ensure only one read happens, and all other callers wait for it to finish before returning. Unfortunately, there is a racey interleaving: Thread A | Thread B | Thread C ---------+----------+--------- (1) | | | (1) | (2) | | (3) | | (4) | | | (2) | | | (1) When this happens, thread B kicks of an unnecessary read. Worse, thread C will see UPTODATE set and return immediately, while the read from thread B is still in progress. This race could result in tree-checker errors like this as the extent buffer is concurrently modified: BTRFS critical (device dm-0): corrupted node, root=256 block=8550954455682405139 owner mismatch, have 11858205567642294356 expect [256, 18446744073709551360] Fix it by testing UPTODATE again after setting the READING bit, and if it's been set, skip the unnecessary read. [ minor update of changelog ]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d7172f52e9933b6ec9305e7fe6e829e3939dba04 , < 0427c8ef8bbb7f304de42ef51d69c960e165e052 (git)
Affected: d7172f52e9933b6ec9305e7fe6e829e3939dba04 , < 3a25878a3378adce5d846300c9570f15aa7f7a80 (git)
Affected: d7172f52e9933b6ec9305e7fe6e829e3939dba04 , < 2885d54af2c2e1d910e20d5c8045bae40e02fbc1 (git)
Affected: d7172f52e9933b6ec9305e7fe6e829e3939dba04 , < ef1e68236b9153c27cb7cf29ead0c532870d4215 (git)
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    Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.24 , ≤ 6.6.* (semver)
Unaffected: 6.7.12 , ≤ 6.7.* (semver)
Unaffected: 6.8.3 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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Once\\nthat completes, end_bbio_meta_read() does\\n\\n    /* (3) */\\n    set_extent_buffer_uptodate(eb);\\n\\n    /* (4) */\\n    clear_bit(EXTENT_BUFFER_READING, \u0026eb-\u003ebflags);\\n\\nNormally, this is enough to ensure only one read happens, and all other\\ncallers wait for it to finish before returning.  Unfortunately, there is\\na racey interleaving:\\n\\n    Thread A | Thread B | Thread C\\n    ---------+----------+---------\\n       (1)   |          |\\n             |    (1)   |\\n       (2)   |          |\\n       (3)   |          |\\n       (4)   |          |\\n             |    (2)   |\\n             |          |    (1)\\n\\nWhen this happens, thread B kicks of an unnecessary read. Worse, thread\\nC will see UPTODATE set and return immediately, while the read from\\nthread B is still in progress.  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