functional test for setns(2) - reassociate thread with a namespace involving CLONE_NEWIPC and CLONE_NEWUTS.
Signed-off-by: Jan Stancek <[email protected]> --- runtest/syscalls | 1 + testcases/kernel/syscalls/.gitignore | 1 + testcases/kernel/syscalls/setns/setns02.c | 231 +++++++++++++++++++++++++++++ 3 files changed, 233 insertions(+), 0 deletions(-) create mode 100644 testcases/kernel/syscalls/setns/setns02.c diff --git a/runtest/syscalls b/runtest/syscalls index a881479..c70bcbd 100644 --- a/runtest/syscalls +++ b/runtest/syscalls @@ -963,6 +963,7 @@ setitimer02 setitimer02 setitimer03 setitimer03 setns01 setns01 +setns02 setns02 setpgid01 setpgid01 setpgid02 setpgid02 diff --git a/testcases/kernel/syscalls/.gitignore b/testcases/kernel/syscalls/.gitignore index 4b8bb94..ce62f3f 100644 --- a/testcases/kernel/syscalls/.gitignore +++ b/testcases/kernel/syscalls/.gitignore @@ -765,6 +765,7 @@ /setitimer/setitimer02 /setitimer/setitimer03 /setns/setns01 +/setns/setns02 /setpgid/setpgid01 /setpgid/setpgid02 /setpgid/setpgid03 diff --git a/testcases/kernel/syscalls/setns/setns02.c b/testcases/kernel/syscalls/setns/setns02.c new file mode 100644 index 0000000..2033980 --- /dev/null +++ b/testcases/kernel/syscalls/setns/setns02.c @@ -0,0 +1,231 @@ +/* + * 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 "usctest.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; + 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); + TEST_CLEANUP; +} +#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 -- 1.7.1 ------------------------------------------------------------------------------ The Go Parallel Website, sponsored by Intel - in partnership with Geeknet, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials, tech docs, whitepapers, evaluation guides, and opinion stories. 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