Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: validate compress cache inode only when enabled F2FS_COMPRESS_INO() uses NM_I(sbi)->max_nid as the synthetic inode number for the compressed page cache inode. That inode only exists when the compress_cache mount option is enabled. When compress_cache is disabled, max_nid is outside the valid inode range. A corrupted directory entry that points to ino == max_nid should therefore be rejected by f2fs_check_nid_range(). However, is_meta_ino() currently treats F2FS_COMPRESS_INO() as a meta inode unconditionally, so f2fs_iget() bypasses do_read_inode() and its nid range check, and instantiates a fake internal inode instead. Gate the compressed cache inode case on COMPRESS_CACHE, matching f2fs_init_compress_inode(). With compress_cache disabled, ino == max_nid now follows the normal inode path and is rejected as an out-of-range nid.
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
6ce19aff0b8cd386860855185c6cd79337fc4d2b to < fcc051d377a9701a452e7663a1a8223c26225df9affected6ce19aff0b8cd386860855185c6cd79337fc4d2b to < 29115b8c9172d34e67ab26cc4f6c209b7a236d7aaffected6ce19aff0b8cd386860855185c6cd79337fc4d2b to < 13e4b59d3a9413f66f116fa6c4828519b960a5eaaffected6ce19aff0b8cd386860855185c6cd79337fc4d2b to < 16161444c30d8dff9428abbae42b72ce4e32a932affected6ce19aff0b8cd386860855185c6cd79337fc4d2b to < 77f216ff9ce5cde8eed9f6d12707e906dffdc9f7affected6ce19aff0b8cd386860855185c6cd79337fc4d2b to < 0969926d987bbde9a1aa49da317582ba37095805affected6ce19aff0b8cd386860855185c6cd79337fc4d2b to < 5073c66a96a9c23c0c2533ed4ed06e42f9021208affecteda23706426da9b611be5beae0f3faa260fb453b4eaffected5.13.19 to < 5.14affected
Linux Linux
Default version status: affected
5.14affected0 to < 5.14unaffected5.15.212 to ≤ 5.15.*unaffected6.1.177 to ≤ 6.1.*unaffected6.6.144 to ≤ 6.6.*unaffected6.12.95 to ≤ 6.12.*unaffected6.18.38 to ≤ 6.18.*unaffected7.1.3 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/fcc051d377a9701a452e7663a1a8223c26225df9 ↗
- https://git.kernel.org/stable/c/29115b8c9172d34e67ab26cc4f6c209b7a236d7a ↗
- https://git.kernel.org/stable/c/13e4b59d3a9413f66f116fa6c4828519b960a5ea ↗
- https://git.kernel.org/stable/c/16161444c30d8dff9428abbae42b72ce4e32a932 ↗
- https://git.kernel.org/stable/c/77f216ff9ce5cde8eed9f6d12707e906dffdc9f7 ↗
- https://git.kernel.org/stable/c/0969926d987bbde9a1aa49da317582ba37095805 ↗
- https://git.kernel.org/stable/c/5073c66a96a9c23c0c2533ed4ed06e42f9021208 ↗