Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab before 16c8321ee40c420f8e02e09515a5126682ddf4ea; affected 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab before a033c950f6731be88a7da98604ed78f302f15b80; affected 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab before 1ab3da12061d7ccb099f7e925fa2d865967a316a; affected 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab before 12feca126831556dc7fabe5a3ba28fbd328768b6; affected 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab before 3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94 |
| Linux / Linux | affected 5.7; unaffected 0 before 5.7; unaffected 6.6.160 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- 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