[PATCH bpf-next v5 3/6] 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@xxxxxxxxx>

Signed-off-by: Cupertino Miranda <cupertino.miranda@xxxxxxxxxx
Acked-by: Eduard Zingerman <eddyz87@xxxxxxxxx>
Cc: Yonghong Song <yonghong.song@xxxxxxxxx>
Cc: Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>
Cc: David Faust <david.faust@xxxxxxxxxx>
Cc: Jose Marchesi <jose.marchesi@xxxxxxxxxx>
Cc: Elena Zannoni <elena.zannoni@xxxxxxxxxx>
Cc: Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx>
---
 kernel/bpf/verifier.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index bdaf0413bf06..1f6deb3e44c5 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -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;
 
-- 
2.39.2





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