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[bpf-next,v4,3/7] bpf/verifier: improve XOR and OR range computation

Message ID 20240429212250.78420-4-cupertino.miranda@oracle.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf/verifier: range computation improvements | expand

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bpf/vmtest-bpf-next-PR success PR summary
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netdev/cc_maintainers warning 9 maintainers not CCed: kpsingh@kernel.org john.fastabend@gmail.com andrii@kernel.org jolsa@kernel.org song@kernel.org daniel@iogearbox.net martin.lau@linux.dev haoluo@google.com sdf@google.com
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Commit Message

Cupertino Miranda April 29, 2024, 9:22 p.m. UTC 
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: Eduard Zingerman <eddyz87@gmail.com>
Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com>
---
 kernel/bpf/verifier.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 1777ab00068b..54aca9b377a4 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -13744,12 +13744,12 @@  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;