Zbigniew Jędrzejewski-Szmek
45669ae264
It turns out that the kernel verifier would reject a program we would build if there was a whitelist, but no entries in the whitelist matched. The program would approximately like this: 0: (61) r2 = *(u32 *)(r1 +0) 1: (54) w2 &= 65535 2: (61) r3 = *(u32 *)(r1 +0) 3: (74) w3 >>= 16 4: (61) r4 = *(u32 *)(r1 +4) 5: (61) r5 = *(u32 *)(r1 +8) 48: (b7) r0 = 0 49: (05) goto pc+1 50: (b7) r0 = 1 51: (95) exit and insn 50 is unreachable, which is illegal. We would then either keep a previous version of the program or allow everything. Make sure we build a valid program that simply rejects everything.
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