selftests/pidfd: test extended attribute support

Test that extended attributes are permanent.

Link: https://lore.kernel.org/20250618-work-pidfs-persistent-v2-14-98f3456fd552@kernel.org
Reviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/tools/testing/selftests/pidfd/pidfd_xattr_test.c b/tools/testing/selftests/pidfd/pidfd_xattr_test.c
index 00d400ac515b4743f0ac232914eccd4fe70f0984..5cf7bb0e4bf2082532cdafcf2a9e1489c920d84b 100644 (file)
--- a/tools/testing/selftests/pidfd/pidfd_xattr_test.c
+++ b/tools/testing/selftests/pidfd/pidfd_xattr_test.c
@@ -94,4 +94,39 @@ TEST_F(pidfs_xattr, set_get_list_xattr_multiple)
        }
 }
 
+TEST_F(pidfs_xattr, set_get_list_xattr_persistent)
+{
+       int ret;
+       char buf[32];
+       char list[PATH_MAX] = {};
+
+       ret = fsetxattr(self->child_pidfd, "trusted.persistent", "persistent value", strlen("persistent value"), 0);
+       ASSERT_EQ(ret, 0);
+
+       memset(buf, 0, sizeof(buf));
+       ret = fgetxattr(self->child_pidfd, "trusted.persistent", buf, sizeof(buf));
+       ASSERT_EQ(ret, strlen("persistent value"));
+       ASSERT_EQ(strcmp(buf, "persistent value"), 0);
+
+       ret = flistxattr(self->child_pidfd, list, sizeof(list));
+       ASSERT_GT(ret, 0);
+       ASSERT_EQ(strcmp(list, "trusted.persistent"), 0)
+
+       ASSERT_EQ(close(self->child_pidfd), 0);
+       self->child_pidfd = -EBADF;
+       sleep(2);
+
+       self->child_pidfd = sys_pidfd_open(self->child_pid, 0);
+       ASSERT_GE(self->child_pidfd, 0);
+
+       memset(buf, 0, sizeof(buf));
+       ret = fgetxattr(self->child_pidfd, "trusted.persistent", buf, sizeof(buf));
+       ASSERT_EQ(ret, strlen("persistent value"));
+       ASSERT_EQ(strcmp(buf, "persistent value"), 0);
+
+       ret = flistxattr(self->child_pidfd, list, sizeof(list));
+       ASSERT_GT(ret, 0);
+       ASSERT_EQ(strcmp(list, "trusted.persistent"), 0);
+}
+
 TEST_HARNESS_MAIN