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bpf/verifier: relax MUL range computation check
MUL instruction required that src_reg would be a known value (i.e. src_reg would be a const value). The condition in this case can be relaxed, since the range computation algorithm used in current code already supports a proper range computation for any valid range value on its operands. Signed-off-by: Cupertino Miranda <cupertino.miranda@oracle.com> Acked-by: Eduard Zingerman <eddyz87@gmail.com> Acked-by: Andrii Nakryiko <andrii.nakryiko@gmail.com> Cc: Yonghong Song <yonghong.song@linux.dev> Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com> Cc: David Faust <david.faust@oracle.com> Cc: Jose Marchesi <jose.marchesi@oracle.com> Cc: Elena Zannoni <elena.zannoni@oracle.com> Link: https://lore.kernel.org/r/20240506141849.185293-6-cupertino.miranda@oracle.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -13902,12 +13902,8 @@ static bool is_safe_to_compute_dst_reg_range(struct bpf_insn *insn,
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case BPF_AND:
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case BPF_XOR:
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case BPF_OR:
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return true;
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/* Compute range for the following only if the src_reg is const.
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*/
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case BPF_MUL:
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return src_is_const;
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return true;
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/* Shift operators range is only computable if shift dimension operand
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* is a constant. Shifts greater than 31 or 63 are undefined. This
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