188 lines · c
1// SPDX-License-Identifier: GPL-2.02#define _GNU_SOURCE3#include <errno.h>4#include <fcntl.h>5#include <sched.h>6#include <stdio.h>7#include <stdbool.h>8#include <sys/stat.h>9#include <sys/syscall.h>10#include <sys/types.h>11#include <time.h>12#include <unistd.h>13#include <string.h>14 15#include "log.h"16#include "timens.h"17 18/*19 * Test shouldn't be run for a day, so add 10 days to child20 * time and check parent's time to be in the same day.21 */22#define DAY_IN_SEC (60*60*24)23#define TEN_DAYS_IN_SEC (10*DAY_IN_SEC)24 25struct test_clock {26 clockid_t id;27 char *name;28 /*29 * off_id is -1 if a clock has own offset, or it contains an index30 * which contains a right offset of this clock.31 */32 int off_id;33 time_t offset;34};35 36#define ct(clock, off_id) { clock, #clock, off_id }37static struct test_clock clocks[] = {38 ct(CLOCK_BOOTTIME, -1),39 ct(CLOCK_BOOTTIME_ALARM, 1),40 ct(CLOCK_MONOTONIC, -1),41 ct(CLOCK_MONOTONIC_COARSE, 1),42 ct(CLOCK_MONOTONIC_RAW, 1),43};44#undef ct45 46static int child_ns, parent_ns = -1;47 48static int switch_ns(int fd)49{50 if (setns(fd, CLONE_NEWTIME)) {51 pr_perror("setns()");52 return -1;53 }54 55 return 0;56}57 58static int init_namespaces(void)59{60 char path[] = "/proc/self/ns/time_for_children";61 struct stat st1, st2;62 63 if (parent_ns == -1) {64 parent_ns = open(path, O_RDONLY);65 if (parent_ns <= 0)66 return pr_perror("Unable to open %s", path);67 }68 69 if (fstat(parent_ns, &st1))70 return pr_perror("Unable to stat the parent timens");71 72 if (unshare_timens())73 return -1;74 75 child_ns = open(path, O_RDONLY);76 if (child_ns <= 0)77 return pr_perror("Unable to open %s", path);78 79 if (fstat(child_ns, &st2))80 return pr_perror("Unable to stat the timens");81 82 if (st1.st_ino == st2.st_ino)83 return pr_perror("The same child_ns after CLONE_NEWTIME");84 85 return 0;86}87 88static int test_gettime(clockid_t clock_index, bool raw_syscall, time_t offset)89{90 struct timespec child_ts_new, parent_ts_old, cur_ts;91 char *entry = raw_syscall ? "syscall" : "vdso";92 double precision = 0.0;93 94 if (check_skip(clocks[clock_index].id))95 return 0;96 97 switch (clocks[clock_index].id) {98 case CLOCK_MONOTONIC_COARSE:99 case CLOCK_MONOTONIC_RAW:100 precision = -2.0;101 break;102 }103 104 if (switch_ns(parent_ns))105 return pr_err("switch_ns(%d)", child_ns);106 107 if (_gettime(clocks[clock_index].id, &parent_ts_old, raw_syscall))108 return -1;109 110 child_ts_new.tv_nsec = parent_ts_old.tv_nsec;111 child_ts_new.tv_sec = parent_ts_old.tv_sec + offset;112 113 if (switch_ns(child_ns))114 return pr_err("switch_ns(%d)", child_ns);115 116 if (_gettime(clocks[clock_index].id, &cur_ts, raw_syscall))117 return -1;118 119 if (difftime(cur_ts.tv_sec, child_ts_new.tv_sec) < precision) {120 ksft_test_result_fail(121 "Child's %s (%s) time has not changed: %lu -> %lu [%lu]\n",122 clocks[clock_index].name, entry, parent_ts_old.tv_sec,123 child_ts_new.tv_sec, cur_ts.tv_sec);124 return -1;125 }126 127 if (switch_ns(parent_ns))128 return pr_err("switch_ns(%d)", parent_ns);129 130 if (_gettime(clocks[clock_index].id, &cur_ts, raw_syscall))131 return -1;132 133 if (difftime(cur_ts.tv_sec, parent_ts_old.tv_sec) > DAY_IN_SEC) {134 ksft_test_result_fail(135 "Parent's %s (%s) time has changed: %lu -> %lu [%lu]\n",136 clocks[clock_index].name, entry, parent_ts_old.tv_sec,137 child_ts_new.tv_sec, cur_ts.tv_sec);138 /* Let's play nice and put it closer to original */139 clock_settime(clocks[clock_index].id, &cur_ts);140 return -1;141 }142 143 ksft_test_result_pass("Passed for %s (%s)\n",144 clocks[clock_index].name, entry);145 return 0;146}147 148int main(int argc, char *argv[])149{150 unsigned int i;151 time_t offset;152 int ret = 0;153 154 nscheck();155 156 check_supported_timers();157 158 ksft_set_plan(ARRAY_SIZE(clocks) * 2);159 160 if (init_namespaces())161 return 1;162 163 /* Offsets have to be set before tasks enter the namespace. */164 for (i = 0; i < ARRAY_SIZE(clocks); i++) {165 if (clocks[i].off_id != -1)166 continue;167 offset = TEN_DAYS_IN_SEC + i * 1000;168 clocks[i].offset = offset;169 if (_settime(clocks[i].id, offset))170 return 1;171 }172 173 for (i = 0; i < ARRAY_SIZE(clocks); i++) {174 if (clocks[i].off_id != -1)175 offset = clocks[clocks[i].off_id].offset;176 else177 offset = clocks[i].offset;178 ret |= test_gettime(i, true, offset);179 ret |= test_gettime(i, false, offset);180 }181 182 if (ret)183 ksft_exit_fail();184 185 ksft_exit_pass();186 return !!ret;187}188