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90 lines
2.5 KiB
90 lines
2.5 KiB
/* Copyright (c) 2014 Red Hat, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of version 2 the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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***********************************************************************
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* File: mountns04.c
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*
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* Tests an unbindable mount: unbindable mount is an unbindable
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* private mount.
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* Description:
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* 1. Creates directories "A", "B" and files "A/A", "B/B"
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* 2. Unshares mount namespace and makes it private (so mounts/umounts
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* have no effect on a real system)
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* 3. Bind mounts directory "A" to "A"
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* 4. Makes directory directory "A" unbindable
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* 5. Tries to bind mount unbindable "A" to "B":
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* - if it fails, test passes
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* - if it passes, test fails
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***********************************************************************/
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#define _GNU_SOURCE
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#include <sys/wait.h>
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#include <sys/mount.h>
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#include <stdio.h>
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#include <errno.h>
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#include "mountns_helper.h"
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#include "test.h"
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#include "safe_macros.h"
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char *TCID = "mountns04";
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int TST_TOTAL = 1;
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#if defined(MS_SHARED) && defined(MS_PRIVATE) \
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&& defined(MS_REC) && defined(MS_UNBINDABLE)
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static void test(void)
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{
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/* unshares the mount ns */
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if (unshare(CLONE_NEWNS) == -1)
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tst_brkm(TBROK | TERRNO, cleanup, "unshare failed");
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/* makes sure mounts/umounts have no effect on a real system */
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SAFE_MOUNT(cleanup, "none", "/", "none", MS_REC|MS_PRIVATE, NULL);
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/* bind mounts DIRA to itself */
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SAFE_MOUNT(cleanup, DIRA, DIRA, "none", MS_BIND, NULL);
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/* makes mount DIRA unbindable */
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SAFE_MOUNT(cleanup, "none", DIRA, "none", MS_UNBINDABLE, NULL);
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/* tries to bind mount unbindable DIRA to DIRB which should fail */
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if (mount(DIRA, DIRB, "none", MS_BIND, NULL) == -1) {
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tst_resm(TPASS, "unbindable mount passed");
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} else {
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SAFE_UMOUNT(cleanup, DIRB);
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tst_resm(TFAIL, "unbindable mount faled");
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}
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SAFE_UMOUNT(cleanup, DIRA);
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}
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int main(int argc, char *argv[])
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{
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int lc;
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tst_parse_opts(argc, argv, NULL, NULL);
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++)
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test();
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cleanup();
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tst_exit();
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}
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#else
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int main(void)
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{
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tst_brkm(TCONF, NULL, "needed mountflags are not defined");
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}
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#endif
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