Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix inode number range checks Patch series "nilfs2: fix potential issues related to reserved inodes". This series fixes one use-after-free issue reported by syzbot, caused by nilfs2's internal inode being exposed in the namespace on a corrupted filesystem, and a couple of flaws that cause problems if the starting number of non-reserved inodes written in the on-disk super block is intentionally (or corruptly) changed from its default value. This patch (of 3): In the current implementation of nilfs2, "nilfs->ns_first_ino", which gives the first non-reserved inode number, is read from the superblock, but its lower limit is not checked. As a result, if a number that overlaps with the inode number range of reserved inodes such as the root directory or metadata files is set in the super block parameter, the inode number test macros (NILFS_MDT_INODE and NILFS_VALID_INODE) will not function properly. In addition, these test macros use left bit-shift calculations using with the inode number as the shift count via the BIT macro, but the result of a shift calculation that exceeds the bit width of an integer is undefined in the C specification, so if "ns_first_ino" is set to a large value other than the default value NILFS_USER_INO (=11), the macros may potentially malfunction depending on the environment. Fix these issues by checking the lower bound of "nilfs->ns_first_ino" and by preventing bit shifts equal to or greater than the NILFS_USER_INO constant in the inode number test macros. Also, change the type of "ns_first_ino" from signed integer to unsigned integer to avoid the need for type casting in comparisons such as the lower bound check introduced this time.
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
8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to < 57235c3c88bb430043728d0d02f44a4efe386476affected8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to < 08cab183a624ba71603f3754643ae11cab34dbc4affected8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to < 731011ac6c37cbe97ece229fc6daa486276052c5affected8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to < 3be4dcc8d7bea52ea41f87aa4bbf959efe7a5987affected8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to < fae1959d6ab2c52677b113935e36ab4e25df37eaaffected8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to < 9194f8ca57527958bee207919458e372d638d783affected8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to < 1c91058425a01131ea30dda6cf43c67b17884d6aaffected8a9d2191e9f43bbcd256a9a6871bd73434c83f2f to < e2fec219a36e0993642844be0f345513507031f4affected
Linux Linux
Default version status: affected
2.6.30affected0 to < 2.6.30unaffected4.19.318 to ≤ 4.19.*unaffected5.4.280 to ≤ 5.4.*unaffected5.10.222 to ≤ 5.10.*unaffected5.15.163 to ≤ 5.15.*unaffected6.1.98 to ≤ 6.1.*unaffected6.6.39 to ≤ 6.6.*unaffected6.9.9 to ≤ 6.9.*unaffected6.10 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/57235c3c88bb430043728d0d02f44a4efe386476 ↗
- https://git.kernel.org/stable/c/08cab183a624ba71603f3754643ae11cab34dbc4 ↗
- https://git.kernel.org/stable/c/731011ac6c37cbe97ece229fc6daa486276052c5 ↗
- https://git.kernel.org/stable/c/3be4dcc8d7bea52ea41f87aa4bbf959efe7a5987 ↗
- https://git.kernel.org/stable/c/fae1959d6ab2c52677b113935e36ab4e25df37ea ↗
- https://git.kernel.org/stable/c/9194f8ca57527958bee207919458e372d638d783 ↗
- https://git.kernel.org/stable/c/1c91058425a01131ea30dda6cf43c67b17884d6a ↗
- https://git.kernel.org/stable/c/e2fec219a36e0993642844be0f345513507031f4 ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗