A process created via fork(2) or clone(2) without the CLONE_NEWUSER
flag is a member of the same user namespace as its parent.
When unshare an user namespace, the calling process is moved into a
new user namespace which is not shared with any previously existing
process.
Signed-off-by: Yuan Sun <sunyu...@huawei.com>
---
testcases/kernel/containers/userns/userns05.c | 142 ++++++++++++++++++++++++++
1 file changed, 142 insertions(+)
create mode 100644 testcases/kernel/containers/userns/userns05.c
diff --git a/testcases/kernel/containers/userns/userns05.c
b/testcases/kernel/containers/userns/userns05.c
new file mode 100644
index 0000000..18178d0
--- /dev/null
+++ b/testcases/kernel/containers/userns/userns05.c
@@ -0,0 +1,142 @@
+/*
+ * 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:
+ * A process created via fork(2) or clone(2) without the
+ * CLONE_NEWUSER flag is a member of the same user namespace as its
+ * parent.
+ * When unshare an user namespace, the calling process is moved into
+ * a new user namespace which is not shared with any previously
+ * existing process.
+ */
+
+#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_namespace5";
+int TST_TOTAL = 1;
+
+static void cleanup(void)
+{
+ tst_rmdir();
+}
+
+/*
+ * child_fn1() - Inside a new user namespace
+ */
+static int child_fn1(void)
+{
+ TST_SAFE_CHECKPOINT_WAIT(NULL, 0);
+ return 0;
+}
+
+static long getusernsidbypid(int pid)
+{
+ char path[BUFSIZ];
+ char userid[BUFSIZ];
+ long id = 0;
+
+ sprintf(path, "/proc/%d/ns/user", pid);
+
+ if (readlink(path, userid, BUFSIZ) == -1)
+ tst_resm(TFAIL, "readlink failure.");
+
+ if (sscanf(userid, "user:[%ld]", &id) != 1)
+ tst_resm(TFAIL | TERRNO, "sscanf failure.");
+ return id;
+}
+
+static void test_userns_id(void)
+{
+ int cpid1, cpid2, cpid3;
+ long parentuserns, cpid1userns, cpid2userns, newparentuserns;
+
+ parentuserns = getusernsidbypid(getpid());
+ cpid1 = ltp_clone_quick(SIGCHLD, (void *)child_fn1,
+ NULL);
+ if (cpid1 < 0)
+ tst_brkm(TFAIL | TERRNO, cleanup, "clone failed");
+ cpid1userns = getusernsidbypid(cpid1);
+ TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
+
+ /* A process created via fork(2) or clone(2) without the
+ CLONE_NEWUSER flag is a member of the same user namespace as its
+ parent.*/
+ if (parentuserns != cpid1userns)
+ tst_resm(TFAIL, "userns:parent should be equal to cpid1");
+
+ cpid2 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
+ (void *)child_fn1, NULL);
+ if (cpid2 < 0)
+ tst_brkm(TBROK | TERRNO, cleanup, "clone failed");
+ cpid2userns = getusernsidbypid(cpid2);
+ TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
+
+ if (parentuserns == cpid2userns)
+ tst_resm(TFAIL, "userns:parent should be not equal to cpid2");
+
+ switch (cpid3 = fork()) {
+ case -1:
+ tst_brkm(TBROK | TERRNO, cleanup, "fork");
+ case 0:
+ if (unshare(CLONE_NEWUSER) == -1) {
+ printf("parent pid unshare failure: (%d) %s",
+ errno, strerror(errno));
+ exit(1);
+ }
+ newparentuserns = getusernsidbypid(getpid());
+
+ /* When unshare an user namespace, the calling process
+ is moved into a new user namespace which is not shared
+ with any previously existing process.*/
+ if (parentuserns == newparentuserns)
+ exit(1);
+ exit(0);
+ }
+
+ tst_record_childstatus(cleanup, cpid1);
+ tst_record_childstatus(cleanup, cpid2);
+ tst_record_childstatus(cleanup, cpid3);
+}
+
+static void setup(void)
+{
+ check_newuser();
+
+ tst_tmpdir();
+ TST_CHECKPOINT_INIT(NULL);
+}
+
+int main(int argc, char *argv[])
+{
+ int lc;
+
+ tst_parse_opts(argc, argv, NULL, NULL);
+ setup();
+
+ for (lc = 0; TEST_LOOPING(lc); lc++) {
+ tst_count = 0;
+ test_userns_id();
+ }
+ cleanup();
+ tst_exit();
+}
--
1.9.1
------------------------------------------------------------------------------
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