Description
In the Linux kernel, the following vulnerability has been resolved: bfs: Reconstruct file type when loading from disk syzbot is reporting that S_IFMT bits of inode->i_mode can become bogus when the S_IFMT bits of the 32bits "mode" field loaded from disk are corrupted or when the 32bits "attributes" field loaded from disk are corrupted. A documentation says that BFS uses only lower 9 bits of the "mode" field. But I can't find an explicit explanation that the unused upper 23 bits (especially, the S_IFMT bits) are initialized with 0. Therefore, ignore the S_IFMT bits of the "mode" field loaded from disk. Also, verify that the value of the "attributes" field loaded from disk is either BFS_VREG or BFS_VDIR (because BFS supports only regular files and the root directory).
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < d0c5ec1f57d8fbb953f166a27d9d32473dc8f3e4affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < aeccd6743ee4fdd1ab8cfcbb5b9a20b613418f6daffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 8f73336b75bd3457b6f9410f2a0601a238f32238affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < a9f626396bfe66f49b743601e862767928237cc0affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 77899444d46162aeb65f229590c26ba266864223affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < a8cb796e7e2cb7971311ba236922f5e7e1be77e6affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 34ab4c75588c07cca12884f2bf6b0347c7a13872affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.10.248 to ≤ 5.10.*unaffected5.15.198 to ≤ 5.15.*unaffected6.1.160 to ≤ 6.1.*unaffected6.6.120 to ≤ 6.6.*unaffected6.12.62 to ≤ 6.12.*unaffected6.17.12 to ≤ 6.17.*unaffected6.18 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/d0c5ec1f57d8fbb953f166a27d9d32473dc8f3e4 ↗
- https://git.kernel.org/stable/c/aeccd6743ee4fdd1ab8cfcbb5b9a20b613418f6d ↗
- https://git.kernel.org/stable/c/8f73336b75bd3457b6f9410f2a0601a238f32238 ↗
- https://git.kernel.org/stable/c/a9f626396bfe66f49b743601e862767928237cc0 ↗
- https://git.kernel.org/stable/c/77899444d46162aeb65f229590c26ba266864223 ↗
- https://git.kernel.org/stable/c/a8cb796e7e2cb7971311ba236922f5e7e1be77e6 ↗
- https://git.kernel.org/stable/c/34ab4c75588c07cca12884f2bf6b0347c7a13872 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗