[CRIU] [PATCH v2 08/57] zdtm: Add pidns00 test
Kirill Tkhai
ktkhai at virtuozzo.com
Thu Apr 6 03:05:49 PDT 2017
On 06.04.2017 01:32, Andrei Vagin wrote:
> @@ -55,6 +54,12 @@ futex_t *futex;
>
> int child(void)
> {
> + int fd;
> + fd = open("/proc/self/ns/pid", O_RDONLY);
> + unshare(CLONE_NEWPID);
> + fork();
> + setns(fd, CLONE_NEWPID);
> + close(fd);
> futex_wait_while_lt(futex, 1);
> return 0;
> }
>
> [root at fc24 criu]# python test/zdtm.py run -t zdtm/static/pidns00 --iter 1 --sbs
> === Run 1/1 ================ zdtm/static/pidns00
>
> ======================== Run zdtm/static/pidns00 in ns =========================
> make[1]: Nothing to be done for 'default'.
> Start test
> Test is SUID
> make[1]: Nothing to be done for 'default'.
> ./pidns00 --pidfile=pidns00.pid --outfile=pidns00.out
> Pause at pre-dump. Press any key to continue.
> Run criu dump
> Pause at pre-restore. Press any key to continue.
> Run criu restore
> =[log]=> dump/zdtm/static/pidns00/30/1/restore.log
> ------------------------ grep Error ------------------------
> (00.021200) Add cgroup ns 7 pid 1
> (00.021467) pstree pid_max=12
> (00.021487) Will restore in 6c020000 namespaces
> (00.021499) NS mask to use 6c020000
> (00.021537) Error (criu/pstree.c:522): pid is already linked
Hm, can't reproduce so far.. Trying to find a reason
> ------------------------ ERROR OVER ------------------------
> ################ Test zdtm/static/pidns00 FAIL at CRIU restore #################
> ##################################### FAIL #####################################
>
> On Tue, Mar 28, 2017 at 06:35:24PM +0300, Kirill Tkhai wrote:
>> Create parent (P) and its three children (C1, C2 and C3)
>> with different pid namespaces:
>>
>> P (pid_ns1)
>> /|\
>> / | \
>> / | \
>> / | \
>> / | \
>> (pid_ns1) C1 C2 C3 (pid_ns1)
>> (pid_ns2)
>>
>> where pid_ns1 is a parent of pid_ns2:
>>
>> pid_ns1
>> |
>> pid_ns2
>>
>> Children C1, C2 and C3 created in the written order,
>> i.e. C1 has the smallest pid and C2 has the biggest.
>>
>> After receiving signal check, that pid namespaces
>> restored right.
>>
>> Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
>> ---
>> test/zdtm/static/Makefile | 1
>> test/zdtm/static/pidns00.c | 206 +++++++++++++++++++++++++++++++++++++++++
>> test/zdtm/static/pidns00.desc | 1
>> 3 files changed, 208 insertions(+)
>> create mode 100644 test/zdtm/static/pidns00.c
>> create mode 100644 test/zdtm/static/pidns00.desc
>>
>> diff --git a/test/zdtm/static/Makefile b/test/zdtm/static/Makefile
>> index 8d5641bb..1c921d35 100644
>> --- a/test/zdtm/static/Makefile
>> +++ b/test/zdtm/static/Makefile
>> @@ -182,6 +182,7 @@ TST_NOFILE := \
>> userns01 \
>> userns02 \
>> netns_sub_veth \
>> + pidns00 \
>> # jobctl00 \
>>
>> ifneq ($(SRCARCH),arm)
>> diff --git a/test/zdtm/static/pidns00.c b/test/zdtm/static/pidns00.c
>> new file mode 100644
>> index 00000000..cdfdbd3d
>> --- /dev/null
>> +++ b/test/zdtm/static/pidns00.c
>> @@ -0,0 +1,206 @@
>> +#define _GNU_SOURCE
>> +#include <stdbool.h>
>> +#include <string.h>
>> +#include <fcntl.h>
>> +#include <unistd.h>
>> +#include <signal.h>
>> +#include <stdio.h>
>> +#include <sys/mount.h>
>> +#include <sys/stat.h>
>> +#include <sys/mman.h>
>> +#include <sys/types.h>
>> +#include <sched.h>
>> +#include <sys/wait.h>
>> +#include <stdlib.h>
>> +#include <limits.h>
>> +#include <dirent.h>
>> +
>> +#include "zdtmtst.h"
>> +#include "lock.h"
>> +
>> +/*
>> + * Create parent (P) and its three children (C1, C2 and C3)
>> + * with different pid namespaces:
>> + *
>> + * P (pid_ns1)
>> + * /|\
>> + * / | \
>> + * / | \
>> + * / | \
>> + * / | \
>> + * (pid_ns1) C1 C2 C3 (pid_ns1)
>> + * (pid_ns2)
>> + *
>> + * where pid_ns1 is a parent of pid_ns2:
>> + *
>> + * pid_ns1
>> + * |
>> + * pid_ns2
>> + * Children C1, C2 and C3 created in the written order,
>> + * i.e. C1 has the smallest pid and C2 has the biggest
>> + * (so, current restorer should restore them in the same order).
>> + * After receiving signal check, that pid namespaces
>> + * restored right.
>> + */
>> +
>> +#ifndef NSIO
>> +#define NSIO 0xb7
>> +#define NS_GET_PARENT _IO(NSIO, 0x2)
>> +#endif
>> +
>> +const char *test_doc = "Check pid namespace hierarhy restores right";
>> +const char *test_author = "Kirill Tkhai <ktkhai at virtuozzo.com>";
>> +
>> +futex_t *futex;
>> +
>> +int child(void)
>> +{
>> + futex_wait_while_lt(futex, 1);
>> + return 0;
>> +}
>> +
>> +int __get_ns_id(int fd, unsigned int *id)
>> +{
>> + struct stat st;
>> + if (fstat(fd, &st) < 0) {
>> + pr_perror("fstat() kaput");
>> + return 1;
>> + }
>> + *id = st.st_ino;
>> + return 0;
>> +}
>> +
>> +int get_ns_id(pid_t pid, unsigned int *id)
>> +{
>> + char buf[PATH_MAX];
>> + int fd, ret;
>> + sprintf(buf, "/proc/%d/ns/pid", pid);
>> + fd = open(buf, O_RDONLY);
>> + if (fd < 0) {
>> + pr_perror("Can't open %s", buf);
>> + return -1;
>> + }
>> + ret = __get_ns_id(fd, id);
>> + close(fd);
>> + return ret;
>> +}
>> +int main(int argc, char **argv)
>> +{
>> + int status, fd, p_fd, i, nr = 0;
>> + unsigned int id, c_id;
>> + char path[PATH_MAX];
>> + pid_t pid[3];
>> +
>> + test_init(argc, argv);
>> + futex = mmap(NULL, sizeof(*futex), PROT_WRITE | PROT_READ, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
>> + if (futex == MAP_FAILED) {
>> + fail("mmap futex\n");
>> + return 1;
>> + }
>> + futex_init(futex);
>> +
>> + /* Child 1 */
>> + pid[0] = fork();
>> + if (pid[0] == -1) {
>> + fail("fork");
>> + return 1;
>> + } else if (pid[0] == 0)
>> + exit(child());
>> + nr++;
>> +
>> + /* Child 2 */
>> + fd = open("/proc/self/ns/pid", O_RDONLY);
>> + if (fd < 0) {
>> + pr_perror("Can't get my own pid ns");
>> + goto err;
>> + }
>> +
>> + if (unshare(CLONE_NEWPID) < 0) {
>> + pr_perror("Can't unshare");
>> + goto err;
>> + }
>> +
>> + pid[1] = fork();
>> + if (pid[1] == -1) {
>> + fail("fork");
>> + return 1;
>> + } else if (pid[1] == 0)
>> + exit(child());
>> + nr++;
>> +
>> + /* Restore pid namespace for children */
>> + if (setns(fd, CLONE_NEWPID) < 0) {
>> + pr_perror("Can't setns");
>> + goto err;
>> + }
>> + close(fd);
>> +
>> + /* Child 3 */
>> + pid[2] = fork();
>> + if (pid[2] == -1) {
>> + fail("fork");
>> + goto err;
>> + } else if (pid[2] == 0)
>> + exit(child());
>> + nr++;
>> +
>> + test_daemon();
>> + test_waitsig();
>> +
>> + if (get_ns_id(getpid(), &id))
>> + goto err;
>> +
>> + for (i = 0; i < nr; i++) {
>> + if (get_ns_id(pid[i], &c_id))
>> + goto err;
>> + if (i % 2 == 0) {
>> + if (c_id != id) {
>> + pr_err("Child %d has wrong pid ns\n", i);
>> + goto err;
>> + }
>> + continue;
>> + }
>> +
>> + if (id == c_id) {
>> + pr_err("Child %d has wrong pid ns\n", i);
>> + goto err;
>> + }
>> + /* This parent namespace of this Child's should be same to ours */
>> + sprintf(path, "/proc/%d/ns/pid", pid[i]);
>> + fd = open(path, O_RDONLY);
>> + if (fd < 0) {
>> + pr_perror("Can't open");
>> + goto err;
>> + }
>> + p_fd = ioctl(fd, NS_GET_PARENT);
>> + if (p_fd < 0)
>> + pr_perror("Can't get parent");
>> + close(fd);
>> + if (p_fd < 0)
>> + goto err;
>> + if (__get_ns_id(p_fd, &c_id))
>> + goto err;
>> + close(p_fd);
>> + if (id != c_id) {
>> + pr_err("Child %d has wrong pid ns hierarhy\n", i);
>> + goto err;
>> + }
>> + }
>> +
>> + futex_set_and_wake(futex, 1);
>> +
>> + while (nr-- > 0) {
>> + if (wait(&status) < 0 || WEXITSTATUS(status)) {
>> + fail("pid: status=%d\n", WEXITSTATUS(status));
>> + goto err;
>> + }
>> + }
>> +
>> + pass();
>> + return 0;
>> +err:
>> + futex_set_and_wake(futex, 1);
>> + while (nr-- > 0)
>> + wait(&status);
>> + return 1;
>> +}
>> diff --git a/test/zdtm/static/pidns00.desc b/test/zdtm/static/pidns00.desc
>> new file mode 100644
>> index 00000000..41c1adcc
>> --- /dev/null
>> +++ b/test/zdtm/static/pidns00.desc
>> @@ -0,0 +1 @@
>> +{'flavor': 'ns uns', 'flags': 'suid noauto'}
>>
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