[PATCH bpf-next v2 4/4] selftests/bpf: Add test for narrow spill into 64-bit spilled scalar

[Kumar Kartikeya Dwivedi <memxor@gmail.com>]

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

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 .../bpf/progs/verifier_stack_noperfmon.c          | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tools/testing/selftests/bpf/progs/verifier_stack_noperfmon.c b/tools/testing/selftests/bpf/progs/verifier_stack_noperfmon.c
index 52da836d47a6..787e01ef477a 100644
--- a/tools/testing/selftests/bpf/progs/verifier_stack_noperfmon.c
+++ b/tools/testing/selftests/bpf/progs/verifier_stack_noperfmon.c
@@ -19,3 +19,18 @@ __naked void stack_noperfmon_rejecte_invalid_read(void)
 	exit;						\
 "	::: __clobber_all);
 }
+
+SEC("socket")
+__description("stack_noperfmon: narrow spill onto 64-bit scalar spilled slots")
+__success
+__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);
+}
-- 
2.43.5