bpf: verifier: permit non-zero returns from async callbacks

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The verifier currently enforces a zero return value for all async
callbacks—a constraint originally introduced for bpf_timer. That
restriction is too narrow for other async use cases.

Relax the rule by allowing non-zero return codes from async callbacks in
general, while preserving the zero-return requirement for bpf_timer to
maintain its existing semantics.

Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20250923112404.668720-5-mykyta.yatsenko5@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Mykyta Yatsenko 2025-09-23 12:23:59 +01:00 • committed by Alexei Starovoitov

parent acc3a0d250

commit d2699bdb6e

1 changed files with 2 additions and 3 deletions

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kernel/bpf/verifier.c

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