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124 lines
2.8 KiB
124 lines
2.8 KiB
/* Copyright (c) 2014 Red Hat, Inc. All rights reserved. |
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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: pidns03.c |
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* |
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* Description: |
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* Clones a new child process with CLONE_NEWPID flag - the new child |
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* process mounts procfs to a "proc" directory and checks if it belongs |
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* to a new pid namespace by: |
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* 1. reading value of "proc/self", which is symlink |
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* to directory named after current pid number |
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* 2. comparing read value (PID) with "1" |
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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 <sys/types.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include "pidns_helper.h" |
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#include "test.h" |
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#include "safe_macros.h" |
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#define PROCDIR "proc" |
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char *TCID = "pidns03"; |
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int TST_TOTAL = 1; |
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static void cleanup(void) |
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{ |
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tst_rmdir(); |
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} |
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static void setup(void) |
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{ |
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tst_require_root(); |
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check_newpid(); |
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tst_tmpdir(); |
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SAFE_MKDIR(cleanup, PROCDIR, 0555); |
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} |
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int child_func(void *arg) |
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{ |
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ssize_t r; |
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char buf[10]; |
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if (mount("none", PROCDIR, "proc", MS_RDONLY, NULL) == -1) { |
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perror("mount"); |
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return 1; |
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} |
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/* self is symlink to directory named after current pid number */ |
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r = readlink(PROCDIR"/self", buf, sizeof(buf)-1); |
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if (r == -1) { |
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perror("readlink"); |
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umount(PROCDIR); |
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return 1; |
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} |
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buf[r] = '\0'; |
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umount(PROCDIR); |
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/* child should have PID 1 in a new pid namespace - if true |
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* procfs belongs to the new pid namespace */ |
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if (strcmp(buf, "1")) { |
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fprintf(stderr, "%s contains: %s\n", PROCDIR"/self", buf); |
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return 1; |
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} |
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return 0; |
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} |
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static void test(void) |
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{ |
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int status; |
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if (do_clone_tests(CLONE_NEWPID, child_func, NULL, NULL, NULL) == -1) |
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tst_brkm(TBROK | TERRNO, cleanup, "clone failed"); |
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SAFE_WAIT(cleanup, &status); |
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { |
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tst_resm(TPASS, "mounting procfs in a new namespace"); |
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return; |
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} |
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if (WIFSIGNALED(status)) { |
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tst_resm(TFAIL, "child was killed with signal %s", |
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tst_strsig(WTERMSIG(status))); |
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return; |
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} |
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tst_resm(TFAIL, "mounting procfs in a new namespace"); |
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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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