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bpf/verifier: improve XOR and OR range computation

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Range for XOR and OR operators would not be attempted unless src_reg
would resolve to a single value, i.e. a known constant value.
This condition is unnecessary, and the following XOR/OR operator
handling could compute a possible better range.

Acked-by: Eduard Zingerman <eddyz87@gmail.com>

Signed-off-by: Cupertino Miranda <cupertino.miranda@oracle.com
Acked-by: Eduard Zingerman <eddyz87@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>
Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Link: https://lore.kernel.org/r/20240506141849.185293-4-cupertino.miranda@oracle.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Cupertino Miranda 2024-05-06 15:18:46 +01:00 committed by Alexei Starovoitov
parent 0922c78f59
commit 138cc42c05
1 changed files with 2 additions and 2 deletions
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4
kernel/bpf/verifier.c
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@ -13900,12 +13900,12 @@ static bool is_safe_to_compute_dst_reg_range(struct bpf_insn *insn,
case BPF_ADD:
case BPF_SUB:
case BPF_AND:
case BPF_XOR:
case BPF_OR:
return true;
/* Compute range for the following only if the src_reg is const.
*/
case BPF_XOR:
case BPF_OR:
case BPF_MUL:
return src_is_const;