[PATCH v3 2/2] selftests: pidfd: skip test if unshare fails with EPERM

[Paolo Bonzini]

Similar to how ENOSYS causes a skip if pidfd_send_signal is not present,
we can do the same for unshare if it fails with EPERM.  This way, running
the test without privileges causes four tests to skip but no early bail out.

Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
 tools/testing/selftests/pidfd/pidfd_test.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/pidfd/pidfd_test.c b/tools/testing/selftests/pidfd/pidfd_test.c
index f65ad4e32353..dcc86e8f7a9f 100644
--- a/tools/testing/selftests/pidfd/pidfd_test.c
+++ b/tools/testing/selftests/pidfd/pidfd_test.c
@@ -162,15 +162,26 @@ static int test_pidfd_send_signal_recycled_pid_fail(void)
 	}
 
 	ret = unshare(CLONE_NEWPID);
-	if (ret < 0)
+	if (ret < 0) {
+		if (errno == EPERM) {
+			ksft_test_result_skip("%s test: Unsharing pid namespace not permitted\n",
+					      test_name);
+			return 0;
+		}
 		ksft_exit_fail_msg("%s test: Failed to unshare pid namespace\n",
 				   test_name);
+	}
 
 	ret = unshare(CLONE_NEWNS);
-	if (ret < 0)
-		ksft_exit_fail_msg(
-			"%s test: Failed to unshare mount namespace\n",
-			test_name);
+	if (ret < 0) {
+		if (errno == EPERM) {
+			ksft_test_result_skip("%s test: Unsharing mount namespace not permitted\n",
+					      test_name);
+			return 0;
+		}
+		ksft_exit_fail_msg("%s test: Failed to unshare mount namespace\n",
+				   test_name);
+	}
 
 	ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, 0);
 	if (ret < 0)
-- 
2.26.2