[LTP] [PATCH v2 4/8] Rewrite userns04.c using new LTP API

[Andrea Cervesato]

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.de>
---
 testcases/kernel/containers/userns/userns04.c | 139 ++++++------------
 1 file changed, 48 insertions(+), 91 deletions(-)

diff --git a/testcases/kernel/containers/userns/userns04.c b/testcases/kernel/containers/userns/userns04.c
index 66d3388a9..63da215e0 100644
--- a/testcases/kernel/containers/userns/userns04.c
+++ b/testcases/kernel/containers/userns/userns04.c
@@ -1,131 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (c) Huawei Technologies Co., Ltd., 2015
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
- * the GNU General Public License for more details.
+ * Copyright (C) 2022 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
  */
 
-/*
- * Verify that:
- *  If a namespace isn't another namespace's ancestor, the process in
- *  first namespace does not have the CAP_SYS_ADMIN capability in the
- *  second namespace and the setns() call fails.
+/*\
+ * [Description]
+ *
+ * Verify that if a namespace isn't another namespace's ancestor, the process in
+ * first namespace does not have the CAP_SYS_ADMIN capability in the second
+ * namespace and the setns() call fails.
  */
 
 #define _GNU_SOURCE
-#include <sys/wait.h>
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <errno.h>
-#include "userns_helper.h"
-#include "test.h"
 
-char *TCID = "user_namespace4";
-int TST_TOTAL = 1;
+#include <stdio.h>
+#include <stdbool.h>
+#include "common.h"
+#include "tst_test.h"
+#include "lapi/syscalls.h"
 
 static void setup(void)
 {
 	check_newuser();
 	tst_syscall(__NR_setns, -1, 0);
-	tst_tmpdir();
-	TST_CHECKPOINT_INIT(NULL);
 }
 
-static void cleanup(void)
+static int child_fn1(LTP_ATTRIBUTE_UNUSED void *arg)
 {
-	tst_rmdir();
-}
-
-static int child_fn1(void *arg LTP_ATTRIBUTE_UNUSED)
-{
-	TST_SAFE_CHECKPOINT_WAIT(NULL, 0);
+	TST_CHECKPOINT_WAIT(0);
 	return 0;
 }
 
 static int child_fn2(void *arg)
 {
-	int exit_val = 0;
-	int ret;
-
-	ret = tst_syscall(__NR_setns, ((long)arg), CLONE_NEWUSER);
-	if (ret != -1) {
-		printf("child2 setns() unexpected success\n");
-		exit_val = 1;
-	} else if (errno != EPERM) {
-		printf("child2 setns() unexpected error: (%d) %s\n",
-			errno, strerror(errno));
-		exit_val = 1;
-	}
+	TEST(tst_syscall(__NR_setns, ((long)arg), CLONE_NEWUSER));
+	if (TST_RET != -1 || TST_ERR != EPERM)
+		tst_res(TFAIL | TERRNO, "child2 setns() error");
+	else
+		tst_res(TPASS, "child2 setns() failed as expected");
+
+	TST_CHECKPOINT_WAIT(1);
 
-	TST_SAFE_CHECKPOINT_WAIT(NULL, 1);
-	return exit_val;
+	return 0;
 }
 
-static void test_cap_sys_admin(void)
+static void run(void)
 {
 	pid_t cpid1, cpid2, cpid3;
 	char path[BUFSIZ];
 	int fd;
 
-	/* child 1 */
-	cpid1 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
-		(void *)child_fn1, NULL);
+	cpid1 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD, (void *)child_fn1, NULL);
 	if (cpid1 < 0)
-		tst_brkm(TBROK | TERRNO, cleanup, "clone failed");
+		tst_brk(TBROK | TTERRNO, "clone failed");
 
-	/* child 2 */
 	sprintf(path, "/proc/%d/ns/user", cpid1);
-	fd = SAFE_OPEN(cleanup, path, O_RDONLY, 0644);
-	cpid2 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
-		(void *)child_fn2, (void *)((long)fd));
+
+	fd = SAFE_OPEN(path, O_RDONLY, 0644);
+	cpid2 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD, (void *)child_fn2, (void *)((long)fd));
 	if (cpid2 < 0)
-		tst_brkm(TBROK | TERRNO, cleanup, "clone failed");
+		tst_brk(TBROK | TTERRNO, "clone failed");
 
 	/* child 3 - throw-away process changing ns to child1 */
-	switch (cpid3 = fork()) {
-	case -1:
-		tst_brkm(TBROK | TERRNO, cleanup, "fork");
-	case 0:
-		if (tst_syscall(__NR_setns, fd, CLONE_NEWUSER) == -1) {
-			printf("parent pid setns failure: (%d) %s",
-				errno, strerror(errno));
-			exit(1);
-		}
-		exit(0);
+	cpid3 = SAFE_FORK();
+	if (!cpid3) {
+		TST_EXP_PASS(tst_syscall(__NR_setns, fd, CLONE_NEWUSER));
+		return;
 	}
 
-	TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
-	TST_SAFE_CHECKPOINT_WAKE(cleanup, 1);
-
-	tst_record_childstatus(cleanup, cpid1);
-	tst_record_childstatus(cleanup, cpid2);
-	tst_record_childstatus(cleanup, cpid3);
-
-	SAFE_CLOSE(cleanup, fd);
+	TST_CHECKPOINT_WAKE(0);
+	TST_CHECKPOINT_WAKE(1);
 
+	SAFE_CLOSE(fd);
 }
 
-int main(int argc, char *argv[])
-{
-	int lc;
-
-	setup();
-	tst_parse_opts(argc, argv, NULL, NULL);
-
-	for (lc = 0; TEST_LOOPING(lc); lc++) {
-		tst_count = 0;
-		test_cap_sys_admin();
-	}
-
-	cleanup();
-	tst_exit();
-}
+static struct tst_test test = {
+	.setup = setup,
+	.test_all = run,
+	.needs_root = 1,
+	.forks_child = 1,
+	.needs_checkpoints = 1,
+	.needs_kconfigs = (const char *[]) {
+		"CONFIG_USER_NS",
+		NULL,
+	},
+};
-- 
2.35.1