[LTP] [PATCH] containers: new testcase userns07

* [LTP] [PATCH] containers: new testcase userns07
@ 2015-08-20  7:20 Yuan Sun
  2015-09-08  7:48 ` Jan Stancek
  0 siblings, 1 reply; 3+ messages in thread
From: Yuan Sun @ 2015-08-20  7:20 UTC (permalink / raw)
  To: jstancek; +Cc: ltp-list

Signed-off-by: Yuan Sun <sunyuan3@huawei.com>
---
 runtest/containers                            |   1 +
 testcases/kernel/containers/.gitignore        |   1 +
 testcases/kernel/containers/userns/userns07.c | 133 ++++++++++++++++++++++++++
 3 files changed, 135 insertions(+)
 create mode 100644 testcases/kernel/containers/userns/userns07.c

diff --git a/runtest/containers b/runtest/containers
index ac37ab2..80de20e 100644
--- a/runtest/containers
+++ b/runtest/containers
@@ -75,3 +75,4 @@ userns03 userns03
 userns04 userns04
 userns05 userns05
 userns06 userns06
+userns07 userns07
diff --git a/testcases/kernel/containers/.gitignore b/testcases/kernel/containers/.gitignore
index 3f96f42..7dc2608 100644
--- a/testcases/kernel/containers/.gitignore
+++ b/testcases/kernel/containers/.gitignore
@@ -10,3 +10,4 @@ userns/userns04
 userns/userns05
 userns/userns06_capcheck
 userns/userns06
+userns/userns07
diff --git a/testcases/kernel/containers/userns/userns07.c b/testcases/kernel/containers/userns/userns07.c
new file mode 100644
index 0000000..decabc8
--- /dev/null
+++ b/testcases/kernel/containers/userns/userns07.c
@@ -0,0 +1,133 @@
+/*
+ * 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:
+ * The kernel imposes a limit of 32 nested levels of user namespaces.
+ */
+
+#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"
+
+#define MAXNEST 32
+
+char *TCID = "userns07";
+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)
+{
+	pid_t cpid1;
+	long level = (long)arg;
+	int status;
+	int parentuid;
+	int parentgid;
+
+	TST_SAFE_CHECKPOINT_WAIT(NULL, 0);
+
+	if (level == MAXNEST)
+		return 0;
+	cpid1 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
+		(void *)child_fn1, (void *)(level + 1));
+	if (cpid1 < 0) {
+		printf("level %ld:unexpected error: (%d) %s\n",
+			level, errno, strerror(errno));
+		return 1;
+	}
+
+	parentuid = geteuid();
+	parentgid = getegid();
+
+	updatemap(cpid1, UID_MAP, 0, parentuid, cleanup);
+	updatemap(cpid1, GID_MAP, 0, parentgid, cleanup);
+
+	TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
+
+	if (waitpid(cpid1, &status, 0) == -1)
+		return 1;
+
+	if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
+		printf("child exited abnormally\n");
+		return 1;
+	} else if (WIFSIGNALED(status)) {
+		printf("child was killed with signal = %d", WTERMSIG(status));
+		return 1;
+	}
+	return 0;
+}
+
+static void test_max_nest(void)
+{
+	pid_t cpid1;
+	int parentuid;
+	int parentgid;
+	int fd;
+	char path[BUFSIZ];
+
+	cpid1 = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
+		(void *)child_fn1, (void *)0);
+	if (cpid1 < 0)
+		tst_brkm(TBROK | TERRNO, cleanup, "clone failed");
+
+	parentuid = geteuid();
+	parentgid = getegid();
+
+	if (access("/proc/self/setgroups", F_OK) == 0) {
+		sprintf(path, "/proc/%d/setgroups", cpid1);
+		fd = SAFE_OPEN(cleanup, path, O_WRONLY, 0644);
+		SAFE_WRITE(cleanup, 1, fd, "deny", 4);
+		SAFE_CLOSE(cleanup, fd);
+	}
+
+	updatemap(cpid1, UID_MAP, 0, parentuid, cleanup);
+	updatemap(cpid1, GID_MAP, 0, parentgid, cleanup);
+
+	TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
+	tst_record_childstatus(cleanup, cpid1);
+}
+
+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_max_nest();
+	}
+
+	cleanup();
+	tst_exit();
+}
+
-- 
1.9.1


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