Description
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 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
cac616db39c207dc63465a4e05c6ce0e60b2cce4 to < 6e1544986536734166176c3add504add23bcbd15affectedcac616db39c207dc63465a4e05c6ce0e60b2cce4 to < d16f0eafcaa62e677a2b5b0dabc1f8d31dfe3d4daffectedcac616db39c207dc63465a4e05c6ce0e60b2cce4 to < e2ae33247e8b2dbe9d116d3e61cadf6d548339c6affectedcac616db39c207dc63465a4e05c6ce0e60b2cce4 to < a4d7f94c1ca914469ced665ec2f98be669aef462affectedcac616db39c207dc63465a4e05c6ce0e60b2cce4 to < e51179a4e09846f8fd0f26a05068520de2b301bfaffected
Linux Linux
Default version status: affected
5.8affected0 to < 5.8unaffected6.6.160 to ≤ 6.6.*unaffected6.12.111 to ≤ 6.12.*unaffected6.18.53 to ≤ 6.18.*unaffected7.2.7 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
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 ↗