bpf: Fix atomic probe zero-extension

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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: d503a04f8b ("bpf: Add support for certain atomics in bpf_arena to x86 JIT")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240701234304.14336-2-iii@linux.ibm.com

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Ilya Leoshkevich 2024-07-02 01:40:19 +02:00 • committed by Daniel Borkmann

parent da5f8fd1f0

commit df34ec9db6

1 changed files with 2 additions and 1 deletions

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kernel/bpf/verifier.c

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