selftests/bpf: validate zero preservation for sub-slot loads

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Validate that 1-, 2-, and 4-byte loads from stack slots not aligned on
8-byte boundary still preserve zero, when loading from all-STACK_ZERO
sub-slots, or when stack sub-slots are covered by spilled register with
known constant zero value.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20231205184248.1502704-8-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Andrii Nakryiko 2023-12-05 10:42:45 -08:00 • committed by Alexei Starovoitov

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commit add1cd7f22

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

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