* Tests an unbindable mount: unbindable mount is an unbindable private mount
Signed-off-by: Matus Marhefka <mmarh...@redhat.com> --- runtest/containers | 1 + testcases/kernel/containers/.gitignore | 1 + testcases/kernel/containers/mountns/mountns04.c | 124 ++++++++++++++++++++++++ 3 files changed, 126 insertions(+) create mode 100644 testcases/kernel/containers/mountns/mountns04.c diff --git a/runtest/containers b/runtest/containers index 3653c9c..8e8e067 100644 --- a/runtest/containers +++ b/runtest/containers @@ -59,3 +59,4 @@ utstest_clone_5 utstest clone 5 mountns01 mountns01 mountns02 mountns02 mountns03 mountns03 +mountns04 mountns04 diff --git a/testcases/kernel/containers/.gitignore b/testcases/kernel/containers/.gitignore index 5b96cb9..4a98373 100644 --- a/testcases/kernel/containers/.gitignore +++ b/testcases/kernel/containers/.gitignore @@ -2,3 +2,4 @@ mountns/mountns01 mountns/mountns02 mountns/mountns03 +mountns/mountns04 diff --git a/testcases/kernel/containers/mountns/mountns04.c b/testcases/kernel/containers/mountns/mountns04.c new file mode 100644 index 0000000..32ba8c9 --- /dev/null +++ b/testcases/kernel/containers/mountns/mountns04.c @@ -0,0 +1,124 @@ +/* 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" and "B" to "B" + * 4. Makes directory "B" shared and 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 "test.h" +#include "usctest.h" +#include "libclone.h" +#include "safe_macros.h" +#include "safe_file_ops.h" +#include "mountns_helper.h" + + +#define DIRA "A" +#define DIRB "B" +char *TCID = "mountns04"; +int TST_TOTAL = 1; + + +/* checks if following mountflags are defined */ +#if defined(MS_SHARED) && defined(MS_PRIVATE) \ + && defined(MS_REC) && defined(MS_UNBINDABLE) + +static void cleanup(void) +{ + umount(DIRA); + umount(DIRB); + tst_rmdir(); +} + +static void setup(void) +{ + tst_require_root(NULL); + check_newns(); /* from mountns_helper.h */ + tst_tmpdir(); + SAFE_MKDIR(cleanup, DIRA, 0777); + SAFE_MKDIR(cleanup, DIRB, 0777); + SAFE_TOUCH(cleanup, DIRA"/A", 0, NULL); + SAFE_TOUCH(cleanup, DIRB"/B", 0, NULL); +} + +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); + /* bind mounts DIRB to itself */ + SAFE_MOUNT(cleanup, DIRB, DIRB, "none", MS_BIND, NULL); + + /* makes mount DIRA unbindable */ + SAFE_MOUNT(cleanup, "none", DIRA, "none", MS_UNBINDABLE, NULL); + /* makes mount DIRB shared */ + SAFE_MOUNT(cleanup, "none", DIRB, "none", MS_SHARED, 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); + SAFE_UMOUNT(cleanup, DIRB); +} + +int main(int argc, char *argv[]) +{ + const char *msg; + int lc; + + msg = parse_opts(argc, argv, NULL, NULL); + if (msg != NULL) + tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); + + setup(); + + for (lc = 0; TEST_LOOPING(lc); lc++) + test(); + + cleanup(); + tst_exit(); +} + +#else /* MS_SHARED && MS_PRIVATE && MS_REC && MS_UNBINDABLE */ +int main(void) +{ + tst_brkm(TCONF, NULL, "needed mountflags are not defined"); +} +#endif -- 1.8.3.1 ------------------------------------------------------------------------------ Slashdot TV. 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