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[bpf-next,v2,01/11] bpf: Fix atomic probe zero-extension

Message ID 20240701133432.3883-2-iii@linux.ibm.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series s390/bpf: Implement arena | expand

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Commit Message

Ilya Leoshkevich July 1, 2024, 1:24 p.m. UTC 
Zero-extending results of atomic probe operations fails with:

    verifier bug. zext_dst is set, but no reg is defined

The problem is that insn_def_regno() handles BPF_ATOMICs, but not
BPF_PROBE_ATOMICs. Fix by adding the missing condition.

Fixes: d503a04f8bc0 ("bpf: Add support for certain atomics in bpf_arena to x86 JIT")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 kernel/bpf/verifier.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index d3927d819465..e25ad5fb9115 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -3217,7 +3217,8 @@  static int insn_def_regno(const struct bpf_insn *insn)
 	case BPF_ST:
 		return -1;
 	case BPF_STX:
-		if (BPF_MODE(insn->code) == BPF_ATOMIC &&
+		if ((BPF_MODE(insn->code) == BPF_ATOMIC ||
+		     BPF_MODE(insn->code) == BPF_PROBE_ATOMIC) &&
 		    (insn->imm & BPF_FETCH)) {
 			if (insn->imm == BPF_CMPXCHG)
 				return BPF_REG_0;