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selftests/bpf: Add test for narrow spill into 64-bit spilled scalar

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Add a test case to verify that without CAP_PERFMON, the test now
succeeds instead of failing due to a verification error.

Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20241204044757.1483141-6-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kumar Kartikeya Dwivedi 2024-12-03 20:47:57 -08:00 committed by Alexei Starovoitov
parent f513c36350
commit 19b6dbc006
1 changed files with 17 additions and 0 deletions
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17
tools/testing/selftests/bpf/progs/verifier_spill_fill.c
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@ -1262,4 +1262,21 @@ __naked void stack_noperfmon_reject_invalid_read(void)
" ::: __clobber_all);
}
SEC("socket")
__description("stack_noperfmon: narrow spill onto 64-bit scalar spilled slots")
__success
__caps_unpriv(CAP_BPF)
__success_unpriv
__naked void stack_noperfmon_spill_32bit_onto_64bit_slot(void)
{
asm volatile(" \
r0 = 0; \
*(u64 *)(r10 - 8) = r0; \
*(u32 *)(r10 - 8) = r0; \
exit; \
" :
:
: __clobber_all);
}
char _license[] SEC("license") = "GPL";