In the Linux kernel, the following vulnerability has been resolved: bpf: Don't predict JMP32 pointer vs zero comparisons Consider the foll

In the Linux kernel, the following vulnerability has been resolved:

bpf: Don't predict JMP32 pointer vs zero comparisons

Consider the following program:

 1    r1 = map_value;      /* low 32 bits are zero at runtime */
 2    r6 = 0xdead000000000000;
 3    if w1 != 0 goto l1;
 4l0: r1 += r6;
 5    r2 = *(u64 *)(r1 + 0);
 6    exit;
 7l1: r6 = 0;
 8    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 ...'.