[PATCH 3/3] selftests/x86: skip shstk tests where perf_event_open() fails

[Richard Patel <ripatel@wii.dev>]

perf_event_open() without caps fails with EACCES on some kernels.
With this fix, the shadow stack selftest passes without privileges
on a kernel with a RHEL-like config.

Signed-off-by: Richard Patel <ripatel@wii.dev>
---
 tools/testing/selftests/x86/test_shadow_stack.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/x86/test_shadow_stack.c b/tools/testing/selftests/x86/test_shadow_stack.c
index 67baebbdbd87..e2340232a7b6 100644
--- a/tools/testing/selftests/x86/test_shadow_stack.c
+++ b/tools/testing/selftests/x86/test_shadow_stack.c
@@ -952,8 +952,11 @@ static int test_uretprobe(void)
 
 	fd = syscall(__NR_perf_event_open, &attr, 0 /* pid */, -1 /* cpu */,
 		     -1 /* group_fd */, PERF_FLAG_FD_CLOEXEC);
-	if (fd < 0)
+	if (fd < 0) {
+		printf("[SKIP]\tUretprobe test, perf_event_open() failed: %m\n");
+		err = 0;
 		goto out;
+	}
 
 	if (sigsetjmp(jmp_buffer, 1))
 		goto out;
@@ -1031,8 +1034,11 @@ static int test_uprobe_call(void)
 
 	fd = syscall(__NR_perf_event_open, &attr, 0 /* pid */, -1 /* cpu */,
 		     -1 /* group_fd */, PERF_FLAG_FD_CLOEXEC);
-	if (fd < 0)
+	if (fd < 0) {
+		printf("[SKIP]\tUprobe on CALL test, perf_event_open() failed: %m\n");
+		err = 0;
 		goto out;
+	}
 
 	if (sigsetjmp(jmp_buffer, 1))
 		goto out;
-- 
2.52.0