Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: bpf: Use array_map_meta_equal for percpu array inner map replacement percpu_array_map_ops.map_meta_equal points to the generic bpf_map_meta_equal(), which does not compare max_entries. When a percpu array serves as an inner map, replacing it with one that has fewer max_entries bypasses the check. Since percpu_array_map_gen_lookup() inlines the original template's index_mask as a JIT immediate, a lookup on the replacement map can access pptrs[] out of bounds. Point percpu_array_map_ops.map_meta_equal to array_map_meta_equal(), which already enforces the max_entries equality check. Add a selftest to verify that replacing a percpu array inner map with a differently-sized one is rejected.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected db69718b8efac802c7cc20d5a6c7dfc913f99c43 before 593980175389a05793f6060aa20e626330960395 |
| Linux / Linux | affected 6.10; unaffected 0 before 6.10; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.