selftests/bpf: Add tests for stack argument validation

Add negative tests that verify the kfunc (rejecting kfunc call
with >8 byte struct as stack argument) and the verifier
(rejecting invalid uses

selftests/bpf: Add tests for stack argument validation

Add negative tests that verify the kfunc (rejecting kfunc call
with >8 byte struct as stack argument) and the verifier
(rejecting invalid uses of r11 for stack arguments).

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20260513045132.2398371-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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