Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Restrict CO-RE poisoning to relocatable instructions CO-RE relocation records can name any instruction offset. When a relocation cannot be resolved, bpf_core_patch_insn() currently poisons its target before checking whether that instruction is a valid relocation target. Malformed metadata can therefore replace jumps, calls, exits, register-source arithmetic, or non-immediate loads instead of failing at the relocation step. Handle poisoning only after the instruction has passed the same class and operand-form checks used for a resolved relocation. Route invalid forms through the existing diagnostic and return a hard error. Keep poisoning supported instructions, including both halves of a plain ldimm64, so an unresolved relocation in dead code remains valid. Extend bpf_core_poison_insn() to poison both halves of ldimm64, and return its status directly from each validated instruction case. This avoids routing the success path through a common label and leaves the helper free to report errors. The shared relocation code applies this restriction to both libbpf and in-kernel CO-RE.
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
d7a252708dbc950ca2064310217e8b9f85846e2f to < a8c47e62d9aea2d47a09e06c1682c59c21b92449affectedd7a252708dbc950ca2064310217e8b9f85846e2f to < d3219c229d16900cef936adad28633c98946e432affectedd7a252708dbc950ca2064310217e8b9f85846e2f to < a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0affectedd7a252708dbc950ca2064310217e8b9f85846e2f to < f2a24101e89dd0804e717da7c1bd6af513698aa2affectedd7a252708dbc950ca2064310217e8b9f85846e2f to < 2d7d04357c41aa49a5ac658fcc207439f2ad6456affectedd7a252708dbc950ca2064310217e8b9f85846e2f to < 8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319affectedd7a252708dbc950ca2064310217e8b9f85846e2f to < 394ae398337c5f87e567f6cd63b937fc2b2f6ddcaffected
Linux Linux
Default version status: affected
5.6affected0 to < 5.6unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.112 to ≤ 6.12.*unaffected6.18.55 to ≤ 6.18.*unaffected7.2.9 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449 ↗
- https://git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432 ↗
- https://git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0 ↗
- https://git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2 ↗
- https://git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456 ↗
- https://git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319 ↗
- https://git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc ↗