If a namespace isn't aother namespace's ancestor, the first namespace
does not have the CAP_SYS_ADMIN capability in the second namespace
and the setns() call fails.
Signed-off-by: Yuan Sun <sunyu...@huawei.com>
---
testcases/kernel/containers/userns/userns04.c | 134 ++++++++++++++++++++++++++
1 file changed, 134 insertions(+)
create mode 100644 testcases/kernel/containers/userns/userns04.c
diff --git a/testcases/kernel/containers/userns/userns04.c
b/testcases/kernel/containers/userns/userns04.c
new file mode 100644
index 0000000..315ea65
--- /dev/null
+++ b/testcases/kernel/containers/userns/userns04.c
@@ -0,0 +1,134 @@
+/*
+ * 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.
+ */
+
+/*
+ * Verify that:
+ * If a namespace isn't another namespace's ancestor, the 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 "test.h"
+#include "userns_helper.h"
+
+char *TCID = "user_namespace4";
+int TST_TOTAL = 1;
+
+static void setup(void)
+{
+ check_newuser();
+ tst_tmpdir();
+ TST_CHECKPOINT_INIT(NULL);
+}
+
+static void cleanup(void)
+{
+ tst_rmdir();
+}
+
+/*
+ * child_fn1() - Inside a new user namespace
+ */
+static int child_fn1(void)
+{
+ TST_SAFE_CHECKPOINT_WAIT(cleanup, 0);
+ return 0;
+}
+
+static int child_fn2(int *arg)
+{
+ int exit_val;
+
+ if (setns(*arg, CLONE_NEWUSER) == -1) {
+ printf("child2 setns() failure is expected\n");
+ exit_val = 0;
+ } else {
+ printf("chile2 setns() success isn't expected\n");
+ exit_val = 1;
+ }
+
+ TST_SAFE_CHECKPOINT_WAIT(cleanup, 1);
+ return exit_val;
+}
+
+int main(int argc, char *argv[])
+{
+ int cpid1status, cpid2status;
+ int cpid1, cpid2;
+ char path[BUFSIZ];
+ int fd;
+
+ tst_parse_opts(argc, argv, NULL, NULL);
+ setup();
+/*
+TEST_LOOPING isn't used because the parent pid can't reset to the
+previous namespace after it joins another namespace by setns.
+*/
+ tst_count = 0;
+ cpid1 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
+ (void *)child_fn1, NULL);
+
+ if (cpid1 < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup, "clone failed");
+
+ 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, &fd);
+
+ if (cpid2 < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup, "clone failed");
+
+ if (setns(fd, CLONE_NEWUSER) == -1)
+ tst_brkm(TFAIL, cleanup, "parent pid setns failure");
+ else
+ tst_resm(TINFO, "parent pid setns success");
+
+ TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
+ TST_SAFE_CHECKPOINT_WAKE(cleanup, 1);
+
+ if ((waitpid(cpid1, &cpid1status, 0) < 0) ||
+ (waitpid(cpid2, &cpid2status, 0) < 0))
+ tst_brkm(TBROK | TERRNO, cleanup,
+ "parent: waitpid failed.");
+
+ if (WIFSIGNALED(cpid1status)) {
+ tst_resm(TFAIL, "child1 was killed with signal = %d",
+ WTERMSIG(cpid1status));
+ } else if (WIFEXITED(cpid1status) &&
+ WEXITSTATUS(cpid1status) != 0) {
+ tst_resm(TFAIL, "child1 exited abnormally");
+ }
+
+ if (WIFSIGNALED(cpid2status)) {
+ tst_resm(TFAIL, "child2 was killed with signal = %d",
+ WTERMSIG(cpid2status));
+ } else if (WIFEXITED(cpid2status) &&
+ WEXITSTATUS(cpid2status) != 0) {
+ tst_resm(TFAIL, "child2 exited abnormally");
+ } else
+ tst_resm(TPASS, "The setns function works well.");
+
+ cleanup();
+ tst_exit();
+}
+
--
1.9.1
------------------------------------------------------------------------------
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