From: Yuan Sun <sunyu...@huawei.com>
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.
Signed-off-by: Yuan Sun <sunyu...@huawei.com>
Signed-off-by: Jan Stancek <jstan...@redhat.com>
---
runtest/containers | 1 +
testcases/kernel/containers/.gitignore | 1 +
testcases/kernel/containers/userns/userns04.c | 151 ++++++++++++++++++++++++++
3 files changed, 153 insertions(+)
create mode 100644 testcases/kernel/containers/userns/userns04.c
diff --git a/runtest/containers b/runtest/containers
index bb1beb6..fd9c06a 100644
--- a/runtest/containers
+++ b/runtest/containers
@@ -70,3 +70,4 @@ mountns04 mountns04
userns01 userns01
userns02 userns02
+userns04 userns04
diff --git a/testcases/kernel/containers/.gitignore
b/testcases/kernel/containers/.gitignore
index e3c92c9..6c5785f 100644
--- a/testcases/kernel/containers/.gitignore
+++ b/testcases/kernel/containers/.gitignore
@@ -5,3 +5,4 @@ mountns/mountns03
mountns/mountns04
userns/userns01
userns/userns02
+userns/userns04
diff --git a/testcases/kernel/containers/userns/userns04.c
b/testcases/kernel/containers/userns/userns04.c
new file mode 100644
index 0000000..206c9ed
--- /dev/null
+++ b/testcases/kernel/containers/userns/userns04.c
@@ -0,0 +1,151 @@
+/*
+ * 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 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 "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();
+}
+
+static int child_fn1(void *arg LTP_ATTRIBUTE_UNUSED)
+{
+ TST_SAFE_CHECKPOINT_WAIT(NULL, 0);
+ return 0;
+}
+
+static int child_fn2(void *arg)
+{
+ int exit_val = 0;
+ int ret;
+
+ ret = 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;
+ }
+
+ TST_SAFE_CHECKPOINT_WAIT(NULL, 1);
+ return exit_val;
+}
+
+static int wait4child(pid_t pid, const char *msg)
+{
+ int status;
+
+ if (waitpid(pid, &status, 0) == -1) {
+ tst_brkm(TBROK | TERRNO, cleanup, "waitpid");
+ } else if (WIFSIGNALED(status)) {
+ tst_resm(TFAIL, "%s: child was killed with signal = %d",
+ msg, WTERMSIG(status));
+ return WTERMSIG(status);
+ } else if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ tst_resm(TFAIL, "%s: child returns %d", msg, status);
+ return WEXITSTATUS(status);
+ }
+
+ return 0;
+}
+
+static void test_cap_sys_admin(void)
+{
+ pid_t cpid1, cpid2, cpid3;
+ char path[BUFSIZ];
+ int fd, status;
+
+ /* child 1 */
+ cpid1 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
+ (void *)child_fn1, NULL);
+ if (cpid1 < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup, "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));
+ if (cpid2 < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup, "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 (setns(fd, CLONE_NEWUSER) == -1) {
+ printf("parent pid setns failure: (%d) %s",
+ errno, strerror(errno));
+ exit(1);
+ }
+ exit(0);
+ }
+
+ TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
+ TST_SAFE_CHECKPOINT_WAKE(cleanup, 1);
+
+ status = 0;
+ status |= wait4child(cpid1, "child1");
+ status |= wait4child(cpid2, "child2");
+ status |= wait4child(cpid3, "child3");
+ if (status == 0)
+ tst_resm(TPASS, "The setns function works well.");
+
+ SAFE_CLOSE(cleanup, 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();
+}
--
1.8.3.1
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