/* Copyright (c) 2014 Red Hat, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of version 2 the GNU General Public License as
* published by the Free Software Foundation.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
***********************************************************************
* File: mountns04.c
*
* Tests an unbindable mount: unbindable mount is an unbindable
* private mount.
* Description:
* 1. Creates directories "A", "B" and files "A/A", "B/B"
* 2. Unshares mount namespace and makes it private (so mounts/umounts
* have no effect on a real system)
* 3. Bind mounts directory "A" to "A"
* 4. Makes directory directory "A" unbindable
* 5. Tries to bind mount unbindable "A" to "B":
* - if it fails, test passes
* - if it passes, test fails
***********************************************************************/
#define _GNU_SOURCE
#include <sys/wait.h>
#include <sys/mount.h>
#include <stdio.h>
#include <errno.h>
#include "mountns_helper.h"
#include "test.h"
#include "safe_macros.h"
char *TCID = "mountns04";
int TST_TOTAL = 1;
#if defined(MS_SHARED) && defined(MS_PRIVATE) \
&& defined(MS_REC) && defined(MS_UNBINDABLE)
static void test(void)
{
/* unshares the mount ns */
if (unshare(CLONE_NEWNS) == -1)
tst_brkm(TBROK | TERRNO, cleanup, "unshare failed");
/* makes sure mounts/umounts have no effect on a real system */
SAFE_MOUNT(cleanup, "none", "/", "none", MS_REC|MS_PRIVATE, NULL);
/* bind mounts DIRA to itself */
SAFE_MOUNT(cleanup, DIRA, DIRA, "none", MS_BIND, NULL);
/* makes mount DIRA unbindable */
SAFE_MOUNT(cleanup, "none", DIRA, "none", MS_UNBINDABLE, NULL);
/* tries to bind mount unbindable DIRA to DIRB which should fail */
if (mount(DIRA, DIRB, "none", MS_BIND, NULL) == -1) {
tst_resm(TPASS, "unbindable mount passed");
} else {
SAFE_UMOUNT(cleanup, DIRB);
tst_resm(TFAIL, "unbindable mount faled");
}
SAFE_UMOUNT(cleanup, DIRA);
}
int main(int argc, char *argv[])
{
int lc;
tst_parse_opts(argc, argv, NULL, NULL);
setup();
for (lc = 0; TEST_LOOPING(lc); lc++)
test();
cleanup();
tst_exit();
}
#else
int main(void)
{
tst_brkm(TCONF, NULL, "needed mountflags are not defined");
}
#endif