selftests/bpf: check zero extension of an arena 32-bit cmpxchg

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Add a test to verify that destination register of a 32-bit cmpxchg
operating on an arena pointer is explicitly zero extended.
W/o patch #1 this did not happen.

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/20260903171542.1438050-3-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Eduard Zingerman 2026-09-03 10:15:41 -07:00 • committed by Alexei Starovoitov

parent 1f3cd9719c

commit 54ed919503

1 changed files with 26 additions and 0 deletions

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

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