This test checks that all supported clocks can be changed by clock_settime.
Cc: [email protected] Signed-off-by: Andrei Vagin <[email protected]> Co-developed-by: Andrei Vagin <[email protected]> Signed-off-by: Dmitry Safonov <[email protected]> --- tools/testing/selftests/timens/.gitignore | 1 + tools/testing/selftests/timens/Makefile | 5 + tools/testing/selftests/timens/config | 1 + tools/testing/selftests/timens/log.h | 21 ++++ tools/testing/selftests/timens/timens.c | 196 ++++++++++++++++++++++++++++++ 5 files changed, 224 insertions(+) create mode 100644 tools/testing/selftests/timens/.gitignore create mode 100644 tools/testing/selftests/timens/Makefile create mode 100644 tools/testing/selftests/timens/config create mode 100644 tools/testing/selftests/timens/log.h create mode 100644 tools/testing/selftests/timens/timens.c diff --git a/tools/testing/selftests/timens/.gitignore b/tools/testing/selftests/timens/.gitignore new file mode 100644 index 000000000000..27a693229ce1 --- /dev/null +++ b/tools/testing/selftests/timens/.gitignore @@ -0,0 +1 @@ +timens diff --git a/tools/testing/selftests/timens/Makefile b/tools/testing/selftests/timens/Makefile new file mode 100644 index 000000000000..b877efb78974 --- /dev/null +++ b/tools/testing/selftests/timens/Makefile @@ -0,0 +1,5 @@ +TEST_GEN_PROGS := timens + +CFLAGS := -Wall -Werror + +include ../lib.mk diff --git a/tools/testing/selftests/timens/config b/tools/testing/selftests/timens/config new file mode 100644 index 000000000000..4480620f6f49 --- /dev/null +++ b/tools/testing/selftests/timens/config @@ -0,0 +1 @@ +CONFIG_TIME_NS=y diff --git a/tools/testing/selftests/timens/log.h b/tools/testing/selftests/timens/log.h new file mode 100644 index 000000000000..05fec7f97870 --- /dev/null +++ b/tools/testing/selftests/timens/log.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __SELFTEST_TIMENS_LOG_H__ +#define __SELFTEST_TIMENS_LOG_H__ + +#define pr_msg(fmt, lvl, ...) \ + fprintf(stderr, "[%s] (%s:%d)\t" fmt "\n", \ + lvl, __FILE__, __LINE__, ##__VA_ARGS__) + +#define pr_p(func, fmt, ...) func(fmt ": %m", ##__VA_ARGS__) + +#define pr_err(fmt, ...) \ + ({ \ + pr_msg(fmt, "ERR", ##__VA_ARGS__) \ + -1; \ + }) +#define pr_fail(fmt, ...) pr_msg(fmt, "FAIL", ##__VA_ARGS__) + +#define pr_perror(fmt, ...) pr_p(pr_err, fmt, ##__VA_ARGS__) + +#endif diff --git a/tools/testing/selftests/timens/timens.c b/tools/testing/selftests/timens/timens.c new file mode 100644 index 000000000000..dfa6701214b1 --- /dev/null +++ b/tools/testing/selftests/timens/timens.c @@ -0,0 +1,196 @@ +// 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 <time.h> +#include <unistd.h> +#include <time.h> + +#include "log.h" + +#ifndef CLONE_NEWTIME +# define CLONE_NEWTIME 0x00001000 +#endif + +/* + * Test shouldn't be run for a day, so add 10 days to child + * time and check parent's time to be in the same day. + */ +#define DAY_IN_SEC (60*60*24) +#define TEN_DAYS_IN_SEC (10*DAY_IN_SEC) + +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) + +#define CLOCK_TYPES \ + ct(CLOCK_BOOTTIME), \ + ct(CLOCK_MONOTONIC), \ + ct(CLOCK_MONOTONIC_COARSE), \ + ct(CLOCK_MONOTONIC_RAW), \ + + +#define ct(clock) clock +static clockid_t clocks[] = { + CLOCK_TYPES +}; +#undef ct +#define ct(clock) #clock +static char *clock_names[] = { + CLOCK_TYPES +}; + +static int child_ns, parent_ns; + +static int switch_ns(int fd) +{ + if (setns(fd, CLONE_NEWTIME)) { + pr_perror("setns()"); + return -1; + } + + return 0; +} + +static int init_namespaces(void) +{ + char path[] = "/proc/self/ns/time"; + struct stat st1, st2; + + parent_ns = open(path, O_RDONLY); + if (parent_ns <= 0) + return pr_perror("Unable to open %s", path); + + if (fstat(parent_ns, &st1)) + return pr_perror("Unable to stat the parent timens"); + + if (unshare(CLONE_NEWTIME)) + return pr_perror("Can't unshare() timens"); + + child_ns = open(path, O_RDONLY); + if (child_ns <= 0) + return pr_perror("Unable to open %s", path); + + if (fstat(child_ns, &st2)) + return pr_perror("Unable to stat the timens"); + + if (st1.st_ino == st2.st_ino) + return pr_perror("The same child_ns after CLONE_NEWTIME"); + + return 0; +} + +static int _gettime(clockid_t clk_id, struct timespec *res, bool raw_syscall) +{ + int err; + + if (!raw_syscall) { + if (clock_gettime(clk_id, res)) { + pr_perror("clock_gettime(%d)", (int)clk_id); + return -1; + } + return 0; + } + + err = syscall(SYS_clock_gettime, clk_id, res); + if (err) + pr_perror("syscall(SYS_clock_gettime(%d))", (int)clk_id); + + return err; +} + +static int _settime(clockid_t clk_id, struct timespec *res, bool raw_syscall) +{ + int err; + + if (!raw_syscall) { + if (clock_settime(clk_id, res)) + return pr_perror("clock_settime(%d)", (int)clk_id); + return 0; + } + + err = syscall(SYS_clock_settime, clk_id, res); + if (err) + pr_perror("syscall(SYS_clock_settime(%d))", (int)clk_id); + + return err; +} + +static int test_gettime(clockid_t clock_index, bool raw_syscall, time_t offset) +{ + struct timespec child_ts_new, parent_ts_old, cur_ts; + char *entry = raw_syscall ? "syscall" : "vdso"; + double precision = 0.0; + + switch (clocks[clock_index]) { + case CLOCK_MONOTONIC_COARSE: + case CLOCK_MONOTONIC_RAW: + precision = -2.0; + break; + } + + if (switch_ns(parent_ns)) + return pr_err("switch_ns(%d)", child_ns); + + if (_gettime(clocks[clock_index], &parent_ts_old, raw_syscall)) + return -1; + + if (switch_ns(child_ns)) + return pr_err("switch_ns(%d)", child_ns); + + child_ts_new.tv_nsec = parent_ts_old.tv_nsec; + child_ts_new.tv_sec = parent_ts_old.tv_sec + offset; + + if (_settime(clocks[clock_index], &child_ts_new, raw_syscall)) + return -1; + + if (_gettime(clocks[clock_index], &cur_ts, raw_syscall)) + return -1; + + if (difftime(cur_ts.tv_sec, child_ts_new.tv_sec) < precision) { + pr_fail("Child's %s (%s) time has not changed: %lu -> %lu [%lu]", + clock_names[clock_index], entry, parent_ts_old.tv_sec, + child_ts_new.tv_sec, cur_ts.tv_sec); + return -1; + } + + if (switch_ns(parent_ns)) + return pr_err("switch_ns(%d)", parent_ns); + + if (_gettime(clocks[clock_index], &cur_ts, raw_syscall)) + return -1; + + if (difftime(cur_ts.tv_sec, parent_ts_old.tv_sec) > DAY_IN_SEC) { + pr_fail("Parent's %s (%s) time has changed: %lu -> %lu [%lu]", + clock_names[clock_index], entry, parent_ts_old.tv_sec, + child_ts_new.tv_sec, cur_ts.tv_sec); + /* Let's play nice and put it closer to original */ + clock_settime(clocks[clock_index], &cur_ts); + return -1; + } + + pr_msg("Passed for %s (%s)", "OK", clock_names[clock_index], entry); + return 0; +} + +int main(int argc, char *argv[]) +{ + unsigned int i; + int ret = 0; + + if (init_namespaces()) + return 1; + + for (i = 0; i < ARRAY_SIZE(clocks); i++) { + ret |= test_gettime(i, true, TEN_DAYS_IN_SEC); + ret |= test_gettime(i, true, -TEN_DAYS_IN_SEC); + ret |= test_gettime(i, false, TEN_DAYS_IN_SEC); + ret |= test_gettime(i, false, -TEN_DAYS_IN_SEC); + } + + return !!ret; +} -- 2.13.6
