diff mbox series

[bpf-next,v4,5/7] bpf/verifier: relax MUL range computation check

Message ID 20240429212250.78420-6-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State Superseded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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Commit Message

Cupertino Miranda April 29, 2024, 9:22 p.m. UTC 
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>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com>
---
 kernel/bpf/verifier.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 54aca9b377a4..b6344cead2e2 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -13746,12 +13746,8 @@  static bool is_safe_to_compute_dst_reg_range(struct bpf_insn *insn,
 	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_MUL:
-		return src_is_const;
+		return true;
 
 	/* Shift operators range is only computable if shift dimension operand
 	 * is a constant. Shifts greater than 31 or 63 are undefined. This