Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: romfs: check sb_set_blocksize() return value romfs_fill_super() ignores the return value of sb_set_blocksize(), which can fail if the requested block size is incompatible with the block device's configuration. This can be triggered by setting a loop device's block size larger than PAGE_SIZE using ioctl(LOOP_SET_BLOCK_SIZE, 32768), then mounting a romfs filesystem on that device. When sb_set_blocksize(sb, ROMBSIZE) is called with ROMBSIZE=4096 but the device has logical_block_size=32768, bdev_validate_blocksize() fails because the requested size is smaller than the device's logical block size. sb_set_blocksize() returns 0 (failure), but romfs ignores this and continues mounting. The superblock's block size remains at the device's logical block size (32768). Later, when sb_bread() attempts I/O with this oversized block size, it triggers a kernel BUG in folio_set_bh(): kernel BUG at fs/buffer.c:1582! BUG_ON(size > PAGE_SIZE); Fix by checking the return value of sb_set_blocksize() and failing the mount with -EINVAL if it returns 0.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a381f0f61b35c8894b0bd0d6acef2d8f9b08b244; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f2521ab1f63a8c244f06a080319e5ff9a2e1bd95; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2c5829cd8fbbc91568c520b666898f57cdcb8cf6; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before cbd9931e6456822067725354d83446c5bb813030; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9b203b8ddd7359270e8a694d0584743555128e2c; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4b71ad7676564a94ec5f7d18298f51e8ae53db73; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ab7ad7abb3660c58ffffdf07ff3bb976e7e0afa0 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.10.251 through 5.10.*; unaffected 5.15.201 through 5.15.*; unaffected 6.1.164 through 6.1.*; unaffected 6.6.127 through 6.6.*; unaffected 6.12.74 through 6.12.*; unaffected 6.18.13 through 6.18.*; unaffected 6.19 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/a381f0f61b35c8894b0bd0d6acef2d8f9b08b244
- https://git.kernel.org/stable/c/f2521ab1f63a8c244f06a080319e5ff9a2e1bd95
- https://git.kernel.org/stable/c/2c5829cd8fbbc91568c520b666898f57cdcb8cf6
- https://git.kernel.org/stable/c/cbd9931e6456822067725354d83446c5bb813030
- https://git.kernel.org/stable/c/9b203b8ddd7359270e8a694d0584743555128e2c
- https://git.kernel.org/stable/c/4b71ad7676564a94ec5f7d18298f51e8ae53db73
- https://git.kernel.org/stable/c/ab7ad7abb3660c58ffffdf07ff3bb976e7e0afa0
ADP enrichment
No English description supplied.