Description
In the Linux kernel, the following vulnerability has been resolved: bpf, cgroup: Fix storage null-ptr-deref after replacing prog Syzkaller reported a storage null-ptr-deref issue after replacing prog. This occurs in the following scenario: 1. prog A, an empty prog, is attached to a cgrp. 2. prog B uses BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE and calls the bpf_get_local_storage helper. 3. link_update is called to replace prog A with prog B. The reason is that __cgroup_bpf_replace fails to alloc and assign the required cgrp storage for the incoming replacement prog. Consequently, the new prog inherits an uninit storage, leading to null-ptr-deref panic when kick the new prog. Fix this by rejecting a link update if new_prog's cgroup storage is incompatible with link->prog.
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
0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to < 85785e7e2ebddcaa5c3b31bd3bcd83ae648985d4affected0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to < 16c8321ee40c420f8e02e09515a5126682ddf4eaaffected0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to < a033c950f6731be88a7da98604ed78f302f15b80affected0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to < 1ab3da12061d7ccb099f7e925fa2d865967a316aaffected0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to < 12feca126831556dc7fabe5a3ba28fbd328768b6affected0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to < 3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94affected
Linux Linux
Default version status: affected
5.7affected0 to < 5.7unaffected6.1.191 to ≤ 6.1.*unaffected6.6.160 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/85785e7e2ebddcaa5c3b31bd3bcd83ae648985d4 ↗
- https://git.kernel.org/stable/c/16c8321ee40c420f8e02e09515a5126682ddf4ea ↗
- https://git.kernel.org/stable/c/a033c950f6731be88a7da98604ed78f302f15b80 ↗
- https://git.kernel.org/stable/c/1ab3da12061d7ccb099f7e925fa2d865967a316a ↗
- https://git.kernel.org/stable/c/12feca126831556dc7fabe5a3ba28fbd328768b6 ↗
- https://git.kernel.org/stable/c/3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94 ↗