Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: bpf: Don't predict JMP32 pointer vs zero comparisons Consider the following program: r1 = map_value; /* low 32 bits are zero at runtime */ r6 = 0xdead000000000000; if w1 != 0 goto l1; l0: r1 += r6; r2 = *(u64 *)(r1 + 0); exit; l1: r6 = 0; goto l0; At the moment is_branch_taken() reports the jump as always taken, because it does not distinguish between BPF_JMP and BPF_JMP32 comparisons when processing 'if w1 != 0 ...'.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected cac616db39c207dc63465a4e05c6ce0e60b2cce4 before 6e1544986536734166176c3add504add23bcbd15; affected cac616db39c207dc63465a4e05c6ce0e60b2cce4 before d16f0eafcaa62e677a2b5b0dabc1f8d31dfe3d4d; affected cac616db39c207dc63465a4e05c6ce0e60b2cce4 before e2ae33247e8b2dbe9d116d3e61cadf6d548339c6; affected cac616db39c207dc63465a4e05c6ce0e60b2cce4 before a4d7f94c1ca914469ced665ec2f98be669aef462; affected cac616db39c207dc63465a4e05c6ce0e60b2cce4 before e51179a4e09846f8fd0f26a05068520de2b301bf |
| Linux / Linux | affected 5.8; unaffected 0 before 5.8; unaffected 6.6.160 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/6e1544986536734166176c3add504add23bcbd15
- https://git.kernel.org/stable/c/d16f0eafcaa62e677a2b5b0dabc1f8d31dfe3d4d
- https://git.kernel.org/stable/c/e2ae33247e8b2dbe9d116d3e61cadf6d548339c6
- https://git.kernel.org/stable/c/a4d7f94c1ca914469ced665ec2f98be669aef462
- https://git.kernel.org/stable/c/e51179a4e09846f8fd0f26a05068520de2b301bf