| /* |
| * Copyright (C) 2013 Linux Test Project, Inc. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| * Further, this software is distributed without any warranty that it |
| * is free of the rightful claim of any third person regarding |
| * infringement or the like. Any license provided herein, whether |
| * implied or otherwise, applies only to this software file. Patent |
| * licenses, if any, provided herein do not apply to combinations of |
| * this program with other software, or any other product whatsoever. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| * 02110-1301, USA. |
| */ |
| /* |
| * functional test for setns(2) - reassociate thread with a namespace |
| * 1. create child with CLONE_NEWUTS, set different hostname in child, |
| * set namespace back to parent ns and check that hostname has changed |
| * 2. create child with CLONE_NEWIPC, set up shared memory in parent |
| * and verify that child can't shmat it, then set namespace |
| * back to parent one and verify that child is able to do shmat |
| */ |
| #define _GNU_SOURCE |
| #include <sys/ipc.h> |
| #include <sys/shm.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/types.h> |
| #include <sys/utsname.h> |
| #include <sys/wait.h> |
| #include <errno.h> |
| #include <sched.h> |
| #include <string.h> |
| #include "config.h" |
| #include "test.h" |
| #include "linux_syscall_numbers.h" |
| #include "safe_macros.h" |
| |
| #define CHILD_STACK_SIZE (1024*1024) |
| #define CP "(child) " |
| char *TCID = "setns02"; |
| |
| #if defined(__NR_setns) && defined(CLONE_NEWIPC) && defined(CLONE_NEWUTS) |
| #include "setns.h" |
| |
| static char *dummy_hostname = "setns_dummy_uts"; |
| static int ns_ipc_fd; |
| static int ns_uts_fd; |
| static key_t ipc_key; |
| static int shmid; |
| |
| static void setup(void); |
| static void cleanup(void); |
| |
| static int do_child_newuts(void *arg) |
| { |
| struct utsname uts, uts_parent; |
| int ns_flag = *(int *)arg; |
| |
| if (uname(&uts_parent) == -1) |
| tst_resm(TFAIL|TERRNO, CP"uname"); |
| tst_resm(TINFO, CP"hostname (inherited from parent): %s", |
| uts_parent.nodename); |
| |
| if (sethostname(dummy_hostname, strlen(dummy_hostname)) == -1) |
| tst_resm(TFAIL|TERRNO, CP"sethostname"); |
| if (uname(&uts) == -1) |
| tst_resm(TFAIL|TERRNO, CP"uname"); |
| |
| tst_resm(TINFO, CP"hostname changed to: %s", uts.nodename); |
| if (strcmp(uts_parent.nodename, uts.nodename) == 0) { |
| tst_resm(TFAIL, CP"expected hostname to be different"); |
| return 1; |
| } else { |
| tst_resm(TPASS, CP"hostname is different in parent/child"); |
| } |
| |
| tst_resm(TINFO, CP"attempting to switch ns back to parent ns"); |
| if (syscall(__NR_setns, ns_uts_fd, ns_flag) == -1) { |
| tst_resm(TFAIL|TERRNO, CP"setns"); |
| return 2; |
| } |
| if (uname(&uts) == -1) |
| tst_resm(TFAIL|TERRNO, CP"uname"); |
| |
| tst_resm(TINFO, CP"hostname: %s", uts.nodename); |
| if (strcmp(uts_parent.nodename, uts.nodename) != 0) { |
| tst_resm(TFAIL, CP"expected hostname to match parent"); |
| return 3; |
| } else { |
| tst_resm(TPASS, CP"hostname now as expected"); |
| } |
| return 0; |
| } |
| |
| static int do_child_newipc(void *arg) |
| { |
| void *p; |
| int ns_flag = *(int *)arg; |
| |
| p = shmat(shmid, NULL, 0); |
| if (p == (void *) -1) { |
| tst_resm(TPASS|TERRNO, CP"shmat failed as expected"); |
| } else { |
| tst_resm(TFAIL, CP"shmat unexpectedly suceeded"); |
| shmdt(p); |
| return 1; |
| } |
| |
| tst_resm(TINFO, CP"attempting to switch ns back to parent ns"); |
| if (syscall(__NR_setns, ns_ipc_fd, ns_flag) == -1) { |
| tst_resm(TFAIL|TERRNO, CP"setns"); |
| return 2; |
| } |
| |
| p = shmat(shmid, NULL, 0); |
| if (p == (void *) -1) { |
| tst_resm(TFAIL|TERRNO, CP"shmat failed after setns"); |
| return 3; |
| } else { |
| tst_resm(TPASS, CP"shmat suceeded"); |
| shmdt(p); |
| } |
| |
| return 0; |
| } |
| |
| static void test_flag(int clone_flag, int ns_flag, int (*fn) (void *arg)) |
| { |
| void *child_stack; |
| int ret, status; |
| |
| child_stack = malloc(CHILD_STACK_SIZE); |
| if (child_stack == NULL) |
| tst_brkm(TBROK, cleanup, "Cannot allocate stack for child"); |
| |
| tst_resm(TINFO, "creating child with clone_flag=0x%x, ns_flag=0x%x", |
| clone_flag, ns_flag); |
| ret = ltp_clone(SIGCHLD|clone_flag, fn, &ns_flag, |
| CHILD_STACK_SIZE, child_stack); |
| if (ret == -1) |
| tst_brkm(TBROK|TERRNO, cleanup, "ltp_clone"); |
| |
| if (waitpid(ret, &status, 0) == -1) |
| tst_brkm(TBROK|TERRNO, cleanup, "waitpid"); |
| if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) |
| tst_resm(TFAIL, "child returns %d", status); |
| else |
| tst_resm(TPASS, "child finished succesfully"); |
| free(child_stack); |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| int lc; |
| const char *msg; |
| |
| msg = parse_opts(argc, argv, NULL, NULL); |
| if (msg != NULL) |
| tst_brkm(TBROK, tst_exit, "OPTION PARSING ERROR - %s", msg); |
| |
| setup(); |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| if (ns_uts_fd != -1) { |
| tst_resm(TINFO, "test_newuts"); |
| test_flag(CLONE_NEWUTS, CLONE_NEWUTS, do_child_newuts); |
| test_flag(CLONE_NEWUTS, 0, do_child_newuts); |
| } |
| if (ns_ipc_fd != -1) { |
| tst_resm(TINFO, "test_newipc"); |
| test_flag(CLONE_NEWIPC, CLONE_NEWIPC, do_child_newipc); |
| test_flag(CLONE_NEWIPC, 0, do_child_newipc); |
| } |
| } |
| cleanup(); |
| tst_exit(); |
| } |
| |
| static void setup(void) |
| { |
| char tmp[PATH_MAX]; |
| |
| tst_require_root(NULL); |
| |
| /* runtime check if syscall is supported */ |
| ltp_syscall(__NR_setns, -1, 0); |
| |
| /* check if kernel has CONFIG_*_NS set and exports /proc entries */ |
| ns_ipc_fd = get_ns_fd(getpid(), "ipc"); |
| ns_uts_fd = get_ns_fd(getpid(), "uts"); |
| if (ns_ipc_fd == -1 && ns_uts_fd == -1) |
| tst_brkm(TCONF, NULL, "your kernel has CONFIG_IPC_NS, " |
| "CONFIG_UTS_NS or CONFIG_PROC disabled"); |
| |
| if (getcwd(tmp, PATH_MAX) == NULL) |
| tst_brkm(TBROK|TERRNO, NULL, "getcwd"); |
| ipc_key = ftok(tmp, 65); |
| shmid = shmget(ipc_key, getpagesize(), IPC_CREAT | 0666); |
| if (shmid == -1) |
| tst_brkm(TBROK|TERRNO, NULL, "shmget"); |
| |
| TEST_PAUSE; |
| } |
| |
| static void cleanup(void) |
| { |
| if (ns_ipc_fd != -1) |
| close(ns_ipc_fd); |
| if (ns_uts_fd != -1) |
| close(ns_uts_fd); |
| |
| shmctl(shmid, IPC_RMID, NULL); |
| } |
| #else |
| int main(int argc, char *argv[]) |
| { |
| tst_brkm(TCONF, NULL, "__NR_setns, CLONE_NEWIPC or CLONE_NEWUTS " |
| " is not defined on your system."); |
| } |
| #endif |