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953d9f5bea
Currently, the verifier does not handle '<const> <cond_op> <non_const>' well. For example, ... 10: (79) r1 = *(u64 *)(r10 -16) ; R1_w=scalar() R10=fp0 11: (b7) r2 = 0 ; R2_w=0 12: (2d) if r2 > r1 goto pc+2 13: (b7) r0 = 0 14: (95) exit 15: (65) if r1 s> 0x1 goto pc+3 16: (0f) r0 += r1 ... At insn 12, verifier decides both true and false branch are possible, but actually only false branch is possible. Currently, the verifier already supports patterns '<non_const> <cond_op> <const>. Add support for patterns '<const> <cond_op> <non_const>' in a similar way. Also fix selftest 'verifier_bounds_mix_sign_unsign/bounds checks mixing signed and unsigned, variant 10' due to this change. Signed-off-by: Yonghong Song <yhs@fb.com> Acked-by: Dave Marchevsky <davemarchevsky@fb.com> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/r/20230406164505.1046801-1-yhs@fb.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>