zdtm: add a test to check non-root shared bind-mounts

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -183,6 +183,7 @@ static/cgroup01
 static/cgroup02
 ns/static/clean_mntns
 static/remap_dead_pid
+ns/static/mntns_root_bind
 "
 
 TEST_CR_KERNEL="
@@ -198,6 +199,7 @@ ns/static/mntns_link_remap
 ns/static/mntns_link_ghost
 ns/static/mntns_shared_bind
 ns/static/mntns_shared_bind02
+ns/static/mntns_root_bind
 "
 else
 	export ZDTM_NOSUBNS=1
@@ -247,6 +249,7 @@ ns/static/console
 ns/static/rtc
 ns/static/mntns_shared_bind
 ns/static/mntns_shared_bind02
+ns/static/mntns_root_bind
 "
 
 source $(readlink -f `dirname $0`/env.sh) || exit 1
@@ -306,6 +309,7 @@ mntns_link_remap
 mntns_link_ghost
 mntns_shared_bind
 mntns_shared_bind02
+mntns_root_bind
 sockets00
 "
 

test/zdtm/live/static/Makefile

@@ -179,6 +179,7 @@ TST_DIR		=				\
 		mntns_link_ghost		\
 		mntns_shared_bind		\
 		mntns_shared_bind02		\
+		mntns_root_bind			\
 
 TST_DIR_FILE	=				\
 		chroot				\

test/zdtm/live/static/mntns_root_bind.c

@@ -0,0 +1,108 @@
+#define _GNU_SOURCE
+#include <stdbool.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sched.h>
+#include <sys/wait.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#include "zdtmtst.h"
+
+#ifndef CLONE_NEWNS
+#define CLONE_NEWNS     0x00020000
+#endif
+
+const char *test_doc	= "Check bind-mouns of the root mount";
+const char *test_author	= "Andrew Vagin <avagin@parallels.com>";
+
+char *dirname;
+TEST_OPTION(dirname, string, "directory name", 1);
+
+
+int main(int argc, char **argv)
+{
+	char path[PATH_MAX], bpath[PATH_MAX], spath[PATH_MAX], bspath[PATH_MAX];
+	pid_t pid;
+	int status;
+	task_waiter_t t;
+
+	test_init(argc, argv);
+
+	task_waiter_init(&t);
+
+	mount(NULL, "/", NULL, MS_SHARED, NULL);
+
+	snprintf(path, sizeof(path), "%s/test", dirname);
+	snprintf(bpath, sizeof(bpath), "%s/test.bind", dirname);
+	snprintf(spath, sizeof(spath), "%s/test/sub", dirname);
+	snprintf(bspath, sizeof(bspath), "%s/test.bind/sub", dirname);
+
+	if (mkdir(dirname, 0700) ||
+	    mkdir(path, 0700) ||
+	    mkdir(spath, 0700) ||
+	    mkdir(bpath, 0700)) {
+		err("mkdir");
+		return 1;
+	}
+
+	pid = fork();
+	if (pid < 0) {
+		err("fork");
+		return 1;
+	}
+	if (pid == 0) {
+		unshare(CLONE_NEWNS);
+		if (mount(path, bpath, NULL, MS_BIND, NULL)) {
+			err("mount");
+			return 1;
+		}
+
+		task_waiter_complete(&t, 1);
+		task_waiter_wait4(&t, 2);
+
+		if (access(bspath, F_OK)) {
+			fail("%s isn't accessiable", bspath);
+			return 1;
+		}
+
+
+		if (umount2(bpath, MNT_DETACH)) {
+			fail("umount");
+			return 1;
+		}
+
+		return 0;
+	}
+
+	task_waiter_wait4(&t, 1);
+
+	if (mount("test", spath, "tmpfs", 0, NULL)) {
+		err("mount");
+		return 1;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	task_waiter_complete(&t, 2);
+
+	if (waitpid(pid, &status, 0) != pid) {
+		err("waitpid %d", pid);
+		return 1;
+	}
+
+	if (status) {
+		err("%d/%d/%d/%d", WIFEXITED(status), WEXITSTATUS(status), WIFSIGNALED(status), WTERMSIG(status));
+		return 1;
+	}
+
+	pass();
+
+	return 0;
+}