mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-02 07:04:24 +00:00
Code Issues Releases Wiki Activity

selftests/timens: Check for right timens offsets after fork and exec

Browse source 
Output on success:
 1..1
 ok 1 exec
 # Pass 1 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0

Output on failure:
 1..1
 not ok 1 36016 16
 Bail out!

Output with lack of permissions:
 1..1
 not ok 1 # SKIP need to run as root

Output without support of time namespaces:
 1..1
 not ok 1 # SKIP Time namespaces are not supported

Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-35-dima@arista.com
This commit is contained in:
Andrei Vagin 2019-11-12 01:27:23 +00:00 committed by Thomas Gleixner
parent 1854b97e4f
commit a750c7474a
3 changed files with 96 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
tools/testing/selftests/timens/.gitignore vendored
View file

@ -1,4 +1,5 @@
clock_nanosleep
exec
gettime_perf
gettime_perf_cold
procfs

2
tools/testing/selftests/timens/Makefile
View file

@ -1,4 +1,4 @@
TEST_GEN_PROGS := timens timerfd timer clock_nanosleep procfs
TEST_GEN_PROGS := timens timerfd timer clock_nanosleep procfs exec
TEST_GEN_PROGS_EXTENDED := gettime_perf
CFLAGS := -Wall -Werror -pthread

94
tools/testing/selftests/timens/exec.c Normal file
View file

@ -0,0 +1,94 @@
// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <stdio.h>
#include <stdbool.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include <time.h>
#include <string.h>
#include "log.h"
#include "timens.h"
#define OFFSET (36000)
int main(int argc, char *argv[])
{
struct timespec now, tst;
int status, i;
pid_t pid;
if (argc > 1) {
if (sscanf(argv[1], "%ld", &now.tv_sec) != 1)
return pr_perror("sscanf");
for (i = 0; i < 2; i++) {
_gettime(CLOCK_MONOTONIC, &tst, i);
if (abs(tst.tv_sec - now.tv_sec) > 5)
return pr_fail("%ld %ld\n", now.tv_sec, tst.tv_sec);
}
return 0;
}
nscheck();
ksft_set_plan(1);
clock_gettime(CLOCK_MONOTONIC, &now);
if (unshare_timens())
return 1;
if (_settime(CLOCK_MONOTONIC, OFFSET))
return 1;
for (i = 0; i < 2; i++) {
_gettime(CLOCK_MONOTONIC, &tst, i);
if (abs(tst.tv_sec - now.tv_sec) > 5)
return pr_fail("%ld %ld\n",
now.tv_sec, tst.tv_sec);
}
if (argc > 1)
return 0;
pid = fork();
if (pid < 0)
return pr_perror("fork");
if (pid == 0) {
char now_str[64];
char *cargv[] = {"exec", now_str, NULL};
char *cenv[] = {NULL};
/* Check that a child process is in the new timens. */
for (i = 0; i < 2; i++) {
_gettime(CLOCK_MONOTONIC, &tst, i);
if (abs(tst.tv_sec - now.tv_sec - OFFSET) > 5)
return pr_fail("%ld %ld\n",
now.tv_sec + OFFSET, tst.tv_sec);
}
/* Check for proper vvar offsets after execve. */
snprintf(now_str, sizeof(now_str), "%ld", now.tv_sec + OFFSET);
execve("/proc/self/exe", cargv, cenv);
return pr_perror("execve");
}
if (waitpid(pid, &status, 0) != pid)
return pr_perror("waitpid");
if (status)
ksft_exit_fail();
ksft_test_result_pass("exec\n");
ksft_exit_pass();
return 0;
}