selftests/bpf: bpf_fastcall patterns entered by a jump

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Check bpf_fastcall pattern detection when the pattern is entered at an
instruction other than the first spill:
- a jump to the first spill allows the rewrite;
- conditional/unconditional a jump to the call or to the fill does not
  allow the rewrite.

Reported-by: Nicholas Carlini <npc@anthropic.com>
Suggested-by: Nicholas Carlini <npc@anthropic.com>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260903205820.1743087-2-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Eduard Zingerman 2026-09-03 13:58:20 -07:00 • committed by Alexei Starovoitov

parent 0b1c83dc3c

commit 65b1518c99

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tools/testing/selftests/bpf/progs/verifier_bpf_fastcall.c

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