selftests/timens: Add Time Namespace test for supported clocks
A test to check that all supported clocks work on host and inside a new time namespace. Use both ways to get time: through VDSO and by entering the kernel with implicit syscall. Introduce a new timens directory in selftests framework for the next timens tests. Output on success: 1..10 ok 1 Passed for CLOCK_BOOTTIME (syscall) ok 2 Passed for CLOCK_BOOTTIME (vdso) ok 3 Passed for CLOCK_BOOTTIME_ALARM (syscall) ok 4 Passed for CLOCK_BOOTTIME_ALARM (vdso) ok 5 Passed for CLOCK_MONOTONIC (syscall) ok 6 Passed for CLOCK_MONOTONIC (vdso) ok 7 Passed for CLOCK_MONOTONIC_COARSE (syscall) ok 8 Passed for CLOCK_MONOTONIC_COARSE (vdso) ok 9 Passed for CLOCK_MONOTONIC_RAW (syscall) ok 10 Passed for CLOCK_MONOTONIC_RAW (vdso) # Pass 10 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0 Output with lack of permissions: 1..10 not ok 1 # SKIP need to run as root Output without support of time namespaces: 1..10 not ok 1 # SKIP Time namespaces are not supported Co-developed-by: Andrei Vagin <avagin@openvz.org> 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/20191112012724.250792-29-dima@arista.com
This commit is contained in:
Dmitry Safonov
Thomas Gleixner
parent
04a8682a71
commit
61c5767603
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@ -50,6 +50,7 @@ TARGETS += splice
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TARGETS += static_keys
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TARGETS += sync
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TARGETS += sysctl
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TARGETS += timens
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ifneq (1, $(quicktest))
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TARGETS += timers
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endif
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@ -0,0 +1 @@
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timens
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@ -0,0 +1,6 @@
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TEST_GEN_PROGS := timens
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CFLAGS := -Wall -Werror
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LDFLAGS := -lrt
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include ../lib.mk
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@ -0,0 +1 @@
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CONFIG_TIME_NS=y
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@ -0,0 +1,26 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __SELFTEST_TIMENS_LOG_H__
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#define __SELFTEST_TIMENS_LOG_H__
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#define pr_msg(fmt, lvl, ...) \
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ksft_print_msg("[%s] (%s:%d)\t" fmt "\n", \
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lvl, __FILE__, __LINE__, ##__VA_ARGS__)
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#define pr_p(func, fmt, ...) func(fmt ": %m", ##__VA_ARGS__)
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#define pr_err(fmt, ...) \
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({ \
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ksft_test_result_error(fmt "\n", ##__VA_ARGS__); \
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-1; \
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})
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#define pr_fail(fmt, ...) \
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({ \
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ksft_test_result_fail(fmt, ##__VA_ARGS__); \
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-1; \
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})
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#define pr_perror(fmt, ...) pr_p(pr_err, fmt, ##__VA_ARGS__)
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#endif
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@ -0,0 +1,190 @@
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// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#include <errno.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <sys/stat.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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#include <time.h>
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#include <string.h>
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#include "log.h"
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#include "timens.h"
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/*
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* Test shouldn't be run for a day, so add 10 days to child
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* time and check parent's time to be in the same day.
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*/
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#define DAY_IN_SEC (60*60*24)
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#define TEN_DAYS_IN_SEC (10*DAY_IN_SEC)
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
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struct test_clock {
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clockid_t id;
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char *name;
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/*
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* off_id is -1 if a clock has own offset, or it contains an index
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* which contains a right offset of this clock.
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*/
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int off_id;
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time_t offset;
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};
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#define ct(clock, off_id) { clock, #clock, off_id }
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static struct test_clock clocks[] = {
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ct(CLOCK_BOOTTIME, -1),
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ct(CLOCK_BOOTTIME_ALARM, 1),
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ct(CLOCK_MONOTONIC, -1),
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ct(CLOCK_MONOTONIC_COARSE, 1),
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ct(CLOCK_MONOTONIC_RAW, 1),
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};
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#undef ct
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static int child_ns, parent_ns = -1;
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static int switch_ns(int fd)
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{
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if (setns(fd, CLONE_NEWTIME)) {
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pr_perror("setns()");
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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 int init_namespaces(void)
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{
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char path[] = "/proc/self/ns/time_for_children";
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struct stat st1, st2;
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if (parent_ns == -1) {
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parent_ns = open(path, O_RDONLY);
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if (parent_ns <= 0)
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return pr_perror("Unable to open %s", path);
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}
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if (fstat(parent_ns, &st1))
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return pr_perror("Unable to stat the parent timens");
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if (unshare_timens())
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return -1;
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child_ns = open(path, O_RDONLY);
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if (child_ns <= 0)
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return pr_perror("Unable to open %s", path);
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if (fstat(child_ns, &st2))
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return pr_perror("Unable to stat the timens");
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if (st1.st_ino == st2.st_ino)
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return pr_perror("The same child_ns after CLONE_NEWTIME");
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return 0;
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}
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static int test_gettime(clockid_t clock_index, bool raw_syscall, time_t offset)
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{
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struct timespec child_ts_new, parent_ts_old, cur_ts;
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char *entry = raw_syscall ? "syscall" : "vdso";
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double precision = 0.0;
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if (check_skip(clocks[clock_index].id))
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return 0;
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switch (clocks[clock_index].id) {
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case CLOCK_MONOTONIC_COARSE:
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case CLOCK_MONOTONIC_RAW:
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precision = -2.0;
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break;
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}
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if (switch_ns(parent_ns))
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return pr_err("switch_ns(%d)", child_ns);
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if (_gettime(clocks[clock_index].id, &parent_ts_old, raw_syscall))
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return -1;
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child_ts_new.tv_nsec = parent_ts_old.tv_nsec;
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child_ts_new.tv_sec = parent_ts_old.tv_sec + offset;
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if (switch_ns(child_ns))
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return pr_err("switch_ns(%d)", child_ns);
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if (_gettime(clocks[clock_index].id, &cur_ts, raw_syscall))
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return -1;
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if (difftime(cur_ts.tv_sec, child_ts_new.tv_sec) < precision) {
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ksft_test_result_fail(
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"Child's %s (%s) time has not changed: %lu -> %lu [%lu]\n",
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clocks[clock_index].name, entry, parent_ts_old.tv_sec,
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child_ts_new.tv_sec, cur_ts.tv_sec);
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return -1;
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}
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if (switch_ns(parent_ns))
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return pr_err("switch_ns(%d)", parent_ns);
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if (_gettime(clocks[clock_index].id, &cur_ts, raw_syscall))
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return -1;
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if (difftime(cur_ts.tv_sec, parent_ts_old.tv_sec) > DAY_IN_SEC) {
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ksft_test_result_fail(
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"Parent's %s (%s) time has changed: %lu -> %lu [%lu]\n",
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clocks[clock_index].name, entry, parent_ts_old.tv_sec,
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child_ts_new.tv_sec, cur_ts.tv_sec);
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/* Let's play nice and put it closer to original */
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clock_settime(clocks[clock_index].id, &cur_ts);
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return -1;
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}
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ksft_test_result_pass("Passed for %s (%s)\n",
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clocks[clock_index].name, entry);
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return 0;
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}
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int main(int argc, char *argv[])
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{
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unsigned int i;
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time_t offset;
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int ret = 0;
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nscheck();
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check_config_posix_timers();
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ksft_set_plan(ARRAY_SIZE(clocks) * 2);
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if (init_namespaces())
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return 1;
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/* Offsets have to be set before tasks enter the namespace. */
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for (i = 0; i < ARRAY_SIZE(clocks); i++) {
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if (clocks[i].off_id != -1)
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continue;
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offset = TEN_DAYS_IN_SEC + i * 1000;
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clocks[i].offset = offset;
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if (_settime(clocks[i].id, offset))
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return 1;
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}
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for (i = 0; i < ARRAY_SIZE(clocks); i++) {
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if (clocks[i].off_id != -1)
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offset = clocks[clocks[i].off_id].offset;
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else
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offset = clocks[i].offset;
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ret |= test_gettime(i, true, offset);
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ret |= test_gettime(i, false, offset);
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}
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if (ret)
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ksft_exit_fail();
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ksft_exit_pass();
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return !!ret;
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}
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@ -0,0 +1,100 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __TIMENS_H__
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#define __TIMENS_H__
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include "../kselftest.h"
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#ifndef CLONE_NEWTIME
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# define CLONE_NEWTIME 0x00000080
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#endif
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static int config_posix_timers = true;
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static inline void check_config_posix_timers(void)
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{
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if (timer_create(-1, 0, 0) == -1 && errno == ENOSYS)
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config_posix_timers = false;
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}
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static inline bool check_skip(int clockid)
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{
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if (config_posix_timers)
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return false;
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switch (clockid) {
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/* Only these clocks are supported without CONFIG_POSIX_TIMERS. */
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case CLOCK_BOOTTIME:
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case CLOCK_MONOTONIC:
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case CLOCK_REALTIME:
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return false;
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default:
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ksft_test_result_skip("Posix Clocks & timers are not supported\n");
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return true;
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}
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return false;
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}
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static inline int unshare_timens(void)
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{
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if (unshare(CLONE_NEWTIME)) {
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if (errno == EPERM)
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ksft_exit_skip("need to run as root\n");
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return pr_perror("Can't unshare() timens");
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}
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return 0;
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}
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static inline int _settime(clockid_t clk_id, time_t offset)
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{
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int fd, len;
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char buf[4096];
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if (clk_id == CLOCK_MONOTONIC_COARSE || clk_id == CLOCK_MONOTONIC_RAW)
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clk_id = CLOCK_MONOTONIC;
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len = snprintf(buf, sizeof(buf), "%d %ld 0", clk_id, offset);
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fd = open("/proc/self/timens_offsets", O_WRONLY);
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if (fd < 0)
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return pr_perror("/proc/self/timens_offsets");
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if (write(fd, buf, len) != len)
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return pr_perror("/proc/self/timens_offsets");
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close(fd);
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return 0;
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}
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static inline int _gettime(clockid_t clk_id, struct timespec *res, bool raw_syscall)
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{
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int err;
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if (!raw_syscall) {
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if (clock_gettime(clk_id, res)) {
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pr_perror("clock_gettime(%d)", (int)clk_id);
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return -1;
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}
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return 0;
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}
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err = syscall(SYS_clock_gettime, clk_id, res);
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if (err)
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pr_perror("syscall(SYS_clock_gettime(%d))", (int)clk_id);
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return err;
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}
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static inline void nscheck(void)
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{
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if (access("/proc/self/ns/time", F_OK) < 0)
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ksft_exit_skip("Time namespaces are not supported\n");
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}
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#endif
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