test: check non-root shared mounts

The idea of this test is to check non-root shared mounts
which lives in a few shared groups.

v2: fix the link description.

travis-ci: success for test: check non-root shared mounts (rev2)
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

test/zdtm/static/Makefile

@@ -247,6 +247,7 @@ TST_DIR		=				\
 		mntns_link_ghost		\
 		mntns_shared_bind		\
 		mntns_shared_bind02		\
+		mntns_shared_bind03		\
 		mntns_root_bind			\
 		mntns_root_bind02		\
 		mntns_overmount			\

test/zdtm/static/mntns_shared_bind03.c

+#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 shared non-root bind-mounts with different shared groups";
+const char *test_author	= "Andrew Vagin <avagin@gmail.com>";
+
+char *dirname;
+TEST_OPTION(dirname, string, "directory name", 1);
+
+
+int main(int argc, char **argv)
+{
+	test_init(argc, argv);
+
+	if (mkdir(dirname, 0700)) {
+		pr_perror("mkdir");
+		return 1;
+	}
+
+	if (chdir(dirname))
+		return 1;
+
+	if (mkdir("1", 0700) || mkdir("2", 0700) || mkdir("3", 0700)) {
+		pr_perror("mkdir");
+		return 1;
+	}
+
+	if (mkdir("A", 0700)) {
+		pr_perror("mkdir");
+		return 1;
+	}
+
+	if (mkdir("B", 0700)) {
+		pr_perror("mkdir");
+		return 1;
+	}
+
+	if (mount("1", "1", NULL, MS_BIND, NULL) ||
+	    mount(NULL, "1", NULL, MS_PRIVATE, NULL) ||
+	    mount(NULL, "1", NULL, MS_SHARED, NULL)) {
+		pr_perror("mount");
+		return 1;
+	}
+
+	if (mount("1", "A", NULL, MS_BIND, NULL) ||
+	    mount(NULL, "A", NULL, MS_PRIVATE, NULL) ||
+	    mount(NULL, "A", NULL, MS_SHARED, NULL)) {
+		pr_perror("mount");
+		return 1;
+	}
+
+	if (mount("1", "B", NULL, MS_BIND, NULL) ||
+	    mount(NULL, "B", NULL, MS_SLAVE, NULL)) {
+		pr_perror("mount");
+		return 1;
+	}
+
+	if (mkdir("1/D", 0700)) {
+		pr_perror("mkdir");
+		return 1;
+	}
+
+	if (mount("1/D", "2", NULL, MS_BIND, NULL)) {
+		pr_perror("mount");
+		return 1;
+	}
+
+	if (mount("1", "3", NULL, MS_BIND, NULL)) {
+		pr_perror("mount");
+		return 1;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	if (mkdir("1/D/test", 0700)) {
+		pr_perror("mkdir");
+		return 1;
+	}
+
+	if (mount("zdtm_shared", "1/D/test", "tmpfs", 0, NULL)) {
+		pr_perror("mount");
+		return 1;
+	}
+
+	if (mount(NULL, "3", NULL, MS_PRIVATE, NULL)) {
+		pr_perror("mount");
+		return 1;
+	}
+
+	if (umount("B/D/test")) {
+		pr_perror("umount");
+		return 1;
+	}
+	if (umount("2/test")) {
+		pr_perror("umount");
+		return 1;
+	}
+	if (umount("3/D/test")) {
+		pr_perror("umount");
+		return 1;
+	}
+
+	pass();
+
+	return 0;
+}

test/zdtm/static/mntns_shared_bind03.desc

+{'flavor': 'ns uns', 'flags': 'suid', 'feature': 'mnt_id'}