* Tests a private mount: private mount does not forward or receive propagation.
Signed-off-by: Matus Marhefka <mmarh...@redhat.com> --- runtest/containers | 1 + testcases/kernel/containers/mountns/mountns02.c | 190 ++++++++++++++++++++++++ 2 files changed, 191 insertions(+) create mode 100644 testcases/kernel/containers/mountns/mountns02.c diff --git a/runtest/containers b/runtest/containers index bf50ae4..ab16bc0 100644 --- a/runtest/containers +++ b/runtest/containers @@ -15,5 +15,6 @@ pidns30 pidns30 pidns31 pidns31 mountns01 mountns01 +mountns02 mountns02 Containers container_test.sh diff --git a/testcases/kernel/containers/mountns/mountns02.c b/testcases/kernel/containers/mountns/mountns02.c new file mode 100644 index 0000000..8a677b7 --- /dev/null +++ b/testcases/kernel/containers/mountns/mountns02.c @@ -0,0 +1,190 @@ +/* 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: mountns02.c + * + * Tests a private mount: private mount does not forward or receive + * propagation. + * 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 both directories ("A" and "B") shared + * 5. Clones a new child process with CLONE_NEWNS flag - the new child + * then mounts directory "A" as private and bind mounts directory + * "B" to "A" (now child must wait for parent to make check - wait + * is needed because mount ns in child stops exist as soon as child + * terminates) + * 6. Parent checks if directory "A" doesn't contain the file "B" + * (changes in child should not be visible in parent as mount in child + * was private): + * - if it doesn't, test passes + * - if it does, test fails + * 7. Parent allows child to terminate + ***********************************************************************/ + +#define _GNU_SOURCE +#include <sys/wait.h> +#include <sys/mount.h> +#include <stdio.h> +#include <unistd.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 = "mountns02"; +int TST_TOTAL = 1; +int pipefd1[2]; +int pipefd2[2]; + + +static void cleanup(void) +{ + close(pipefd1[0]); + close(pipefd1[1]); + close(pipefd2[0]); + close(pipefd2[1]); + umount(DIRA); + 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); +} + +int child_func(void *arg) +{ + char buf; + + /* makes DIRA private */ + if (mount("none", DIRA, "none", MS_PRIVATE, NULL) == -1) { + perror("mount"); + write(pipefd1[1], "1", 1); + return 1; + } + + /* bind mounts DIRB to DIRA making contents of DIRB visible + * in DIRA (should apply only for child as DIRA is private) */ + if (mount(DIRB, DIRA, "none", MS_BIND, NULL) == -1) { + perror("mount"); + write(pipefd1[1], "1", 1); + return 1; + } + + /* tells parent to stop waiting and continue */ + write(pipefd1[1], "0", 1); + + /* waits for parent approval to terminate */ + read(pipefd2[0], &buf, 1); + + return 0; +} + +static void test(void) +{ + int status, pass; + char buf; + + /* creates a pipe for synchronization between parent and child */ + SAFE_PIPE(cleanup, pipefd1); + SAFE_PIPE(cleanup, pipefd2); + + /* unshares the mount ns */ + if (unshare(CLONE_NEWNS) == -1) + tst_brkm(TBROK | TERRNO, cleanup, "unshare failed"); + /* makes sure parent 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 shared */ + SAFE_MOUNT(cleanup, "none", DIRA, "none", MS_SHARED, NULL); + /* makes mount DIRB shared */ + SAFE_MOUNT(cleanup, "none", DIRB, "none", MS_SHARED, NULL); + + + if (do_clone_tests(CLONE_NEWNS, child_func, NULL, NULL, NULL) == -1) + tst_brkm(TBROK | TERRNO, cleanup, "clone failed"); + + /* waits for child bind mount */ + SAFE_READ(cleanup, 0, pipefd1[0], &buf, 1); + /* in case some mount failed in child */ + if (buf == '1') + tst_brkm(TBROK, cleanup, "child failed"); + + /* as child made private mount from DIRA, parent should not + * see file "B" in DIRA; following checks if DIRA doesn't contain + * file "B" */ + if (access(DIRA"/B", F_OK) == -1) + pass = 1; + else + pass = 0; + + /* tells child to terminate */ + SAFE_WRITE(cleanup, 0, pipefd2[1], "0", 1); + + SAFE_WAIT(cleanup, &status); + + if (WIFEXITED(status) && WEXITSTATUS(status) != 0) + tst_brkm(TBROK, cleanup, "child failed"); + + if (WIFSIGNALED(status)) { + tst_resm(TFAIL, "child was killed with signal %s", + tst_strsig(WTERMSIG(status))); + return; + } + + if (pass) + tst_resm(TPASS, "private mount passed"); + else + tst_resm(TFAIL, "private mount failed"); +} + +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(); +} -- 1.8.3.1 ------------------------------------------------------------------------------ _______________________________________________ Ltp-list mailing list Ltp-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ltp-list
