Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: bpf: reject BPF_PSEUDO_FUNC reference to the main program fixups.c:jit_subprogs() rewrites BPF_PSEUDO_FUNC loads to contain real function addresses. This function is invoked from bpf_jit_subprogs() only when env->subprog_cnt > 1. Meaning that for any program like below: int main(void *ctx) { void *ptr = main; ... bpf_timer_set_callback(..., ptr); ... } The 'ptr' won't be ever converted to contain an address. In combination with e.g. bpf_timer_set_callback() this would lead to a function call at a bogus address. Instead of complicating the implementation, just assume that no useful program needs main to be a sync or async callback and reject BPF_PSEUDO_FUNC loads for the main subprogram.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 69c087ba6225b574afb6e505b72cb75242a3d844 before c74750dca96f40a1adb9d334f5a3152f44b270c3; affected 69c087ba6225b574afb6e505b72cb75242a3d844 before 314c8caa9cb64ad60c5b969fe9a3e2dcdccf156f; affected 69c087ba6225b574afb6e505b72cb75242a3d844 before 8cb75f7ada25b1cf25f2f74dec3ba649b9064a09; affected 69c087ba6225b574afb6e505b72cb75242a3d844 before 118212417ba0120d99f84154799f8880f07411f4; affected 69c087ba6225b574afb6e505b72cb75242a3d844 before d6c39774ae093c9f7009cc4ae918f18fc1af7ae7; affected 69c087ba6225b574afb6e505b72cb75242a3d844 before 92f0bd0e2b632c6565ac2214a4d7d2ed37e5b9f6; affected 69c087ba6225b574afb6e505b72cb75242a3d844 before 374b2c5561db80fcdd7cdce44af37a49416f61c7 |
| Linux / Linux | affected 5.13; unaffected 0 before 5.13; unaffected 5.15.222 through 5.15.*; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/c74750dca96f40a1adb9d334f5a3152f44b270c3
- https://git.kernel.org/stable/c/314c8caa9cb64ad60c5b969fe9a3e2dcdccf156f
- https://git.kernel.org/stable/c/8cb75f7ada25b1cf25f2f74dec3ba649b9064a09
- https://git.kernel.org/stable/c/118212417ba0120d99f84154799f8880f07411f4
- https://git.kernel.org/stable/c/d6c39774ae093c9f7009cc4ae918f18fc1af7ae7
- https://git.kernel.org/stable/c/92f0bd0e2b632c6565ac2214a4d7d2ed37e5b9f6
- https://git.kernel.org/stable/c/374b2c5561db80fcdd7cdce44af37a49416f61c7