Description
In the Linux kernel, the following vulnerability has been resolved: smack: fix cred UAF in smack_file_send_sigiotask() When inspecting the credentials of another task, objective credentials (->real_cred, accessed with __task_cred()) must always be used. Accessing ->cred on a non-current task is forbidden unless that task is being created or destroyed; a task is allowed to change its own ->cred pointer with no synchronization, and changing ->cred should only affect the current syscall. smack_file_send_sigiotask() was accessing both sets of credentials: First tsk->cred, then __task_cred(tsk). Fix it, always access the objective credentials here. I have tested that this bug can lead to a KASAN-reported UAF of struct cred in smack_file_send_sigiotask(), and that this fix prevents the race.
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
3b11a1decef07c19443d24ae926982bc8ec9f4c0 to < a512366d84e134a9eefc2cc40eeb6e80e2ec162caffected3b11a1decef07c19443d24ae926982bc8ec9f4c0 to < 7c7fe043f3099d0d35002b248967f75e55345b93affected3b11a1decef07c19443d24ae926982bc8ec9f4c0 to < f9c7b1f2b9d8f4176d2632743f51400855978aceaffected3b11a1decef07c19443d24ae926982bc8ec9f4c0 to < b5bcf3adfa27279da4401ab8f1e1a706601a92beaffected3b11a1decef07c19443d24ae926982bc8ec9f4c0 to < ed64aa505875a3b4defd504ee8e59e1949246a62affected3b11a1decef07c19443d24ae926982bc8ec9f4c0 to < b791401bf389a1546a830d2b381ca60fe94c7870affected3b11a1decef07c19443d24ae926982bc8ec9f4c0 to < fedc88e38ce979a720cd2de042578cb5df3dc8deaffected
Linux Linux
Default version status: affected
2.6.29affected0 to < 2.6.29unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.109 to ≤ 6.12.*unaffected6.18.50 to ≤ 6.18.*unaffected7.2.4 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/a512366d84e134a9eefc2cc40eeb6e80e2ec162c ↗
- https://git.kernel.org/stable/c/7c7fe043f3099d0d35002b248967f75e55345b93 ↗
- https://git.kernel.org/stable/c/f9c7b1f2b9d8f4176d2632743f51400855978ace ↗
- https://git.kernel.org/stable/c/b5bcf3adfa27279da4401ab8f1e1a706601a92be ↗
- https://git.kernel.org/stable/c/ed64aa505875a3b4defd504ee8e59e1949246a62 ↗
- https://git.kernel.org/stable/c/b791401bf389a1546a830d2b381ca60fe94c7870 ↗
- https://git.kernel.org/stable/c/fedc88e38ce979a720cd2de042578cb5df3dc8de ↗