Description
In the Linux kernel, the following vulnerability has been resolved: net/atm: fix slab-out-of-bounds read in vcc_setsockopt() vcc_setsockopt() contained an ineffective optlen check: if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) return -EINVAL; If __SO_LEVEL_MATCH(optname, level) evaluated to false (e.g. if the caller passed a mismatched level), the length check optlen != __SO_SIZE(optname) was short-circuited and bypassed. Execution then fell through to switch(optname), calling copy_from_sockptr() assuming optval contained sufficient space. Furthermore, even if level matched, a cgroup BPF setsockopt filter could shrink optlen after entry. Because copy_from_sockptr() on kernel pointers uses memcpy(), this leads to a KASAN slab-out-of-bounds read when optlen is smaller than the expected structure size. Fix this by using copy_safe_from_sockptr(), which unconditionally validates that optlen is at least the expected size before copying. Also change the local 'value' variable type from 'unsigned long' to 'int' so that SO_SETCLP matches its sizeof(int) ABI encoding on 64-bit systems.
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 < b3bcd5d65ac03c15787b2a5b36c718e26a689336affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 35f258fee9ed358c6d0f57f91c30bf029c3724afaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6eb6af88710977eb529b558a07294874d8c40c4daffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 9f77c1ab382188f5b51982fab6d913443b6dc59faffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 2c5988c7349c0b64a7e0441bfc6e1dca54f7116aaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected6.1.183 to ≤ 6.1.*unaffected6.6.152 to ≤ 6.6.*unaffected6.12.104 to ≤ 6.12.*unaffected6.18.45 to ≤ 6.18.*unaffected7.1.9 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/b3bcd5d65ac03c15787b2a5b36c718e26a689336 ↗
- https://git.kernel.org/stable/c/35f258fee9ed358c6d0f57f91c30bf029c3724af ↗
- https://git.kernel.org/stable/c/6eb6af88710977eb529b558a07294874d8c40c4d ↗
- https://git.kernel.org/stable/c/9f77c1ab382188f5b51982fab6d913443b6dc59f ↗
- https://git.kernel.org/stable/c/2c5988c7349c0b64a7e0441bfc6e1dca54f7116a ↗
- https://git.kernel.org/stable/c/d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3 ↗