1 // SPDX-License-Identifier: GPL-2.0 2 #define _GNU_SOURCE 3 #include <errno.h> 4 #include <fcntl.h> 5 #include <math.h> 6 #include <sched.h> 7 #include <stdio.h> 8 #include <stdbool.h> 9 #include <stdlib.h> 10 #include <sys/stat.h> 11 #include <sys/syscall.h> 12 #include <sys/types.h> 13 #include <time.h> 14 #include <unistd.h> 15 16 #include "log.h" 17 #include "timens.h" 18 19 /* 20 * Test shouldn't be run for a day, so add 10 days to child 21 * time and check parent's time to be in the same day. 22 */ 23 #define MAX_TEST_TIME_SEC (60*5) 24 #define DAY_IN_SEC (60*60*24) 25 #define TEN_DAYS_IN_SEC (10*DAY_IN_SEC) 26 27 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) 28 29 static int child_ns, parent_ns; 30 31 static int switch_ns(int fd) 32 { 33 if (setns(fd, CLONE_NEWTIME)) 34 return pr_perror("setns()"); 35 36 return 0; 37 } 38 39 static int init_namespaces(void) 40 { 41 char path[] = "/proc/self/ns/time_for_children"; 42 struct stat st1, st2; 43 44 parent_ns = open(path, O_RDONLY); 45 if (parent_ns <= 0) 46 return pr_perror("Unable to open %s", path); 47 48 if (fstat(parent_ns, &st1)) 49 return pr_perror("Unable to stat the parent timens"); 50 51 if (unshare_timens()) 52 return -1; 53 54 child_ns = open(path, O_RDONLY); 55 if (child_ns <= 0) 56 return pr_perror("Unable to open %s", path); 57 58 if (fstat(child_ns, &st2)) 59 return pr_perror("Unable to stat the timens"); 60 61 if (st1.st_ino == st2.st_ino) 62 return pr_err("The same child_ns after CLONE_NEWTIME"); 63 64 if (_settime(CLOCK_BOOTTIME, TEN_DAYS_IN_SEC)) 65 return -1; 66 67 return 0; 68 } 69 70 static int read_proc_uptime(struct timespec *uptime) 71 { 72 unsigned long up_sec, up_nsec; 73 FILE *proc; 74 75 proc = fopen("/proc/uptime", "r"); 76 if (proc == NULL) { 77 pr_perror("Unable to open /proc/uptime"); 78 return -1; 79 } 80 81 if (fscanf(proc, "%lu.%02lu", &up_sec, &up_nsec) != 2) { 82 if (errno) { 83 pr_perror("fscanf"); 84 return -errno; 85 } 86 pr_err("failed to parse /proc/uptime"); 87 return -1; 88 } 89 fclose(proc); 90 91 uptime->tv_sec = up_sec; 92 uptime->tv_nsec = up_nsec; 93 return 0; 94 } 95 96 static int read_proc_stat_btime(unsigned long long *boottime_sec) 97 { 98 FILE *proc; 99 char line_buf[2048]; 100 101 proc = fopen("/proc/stat", "r"); 102 if (proc == NULL) { 103 pr_perror("Unable to open /proc/stat"); 104 return -1; 105 } 106 107 while (fgets(line_buf, 2048, proc)) { 108 if (sscanf(line_buf, "btime %llu", boottime_sec) != 1) 109 continue; 110 fclose(proc); 111 return 0; 112 } 113 if (errno) { 114 pr_perror("fscanf"); 115 fclose(proc); 116 return -errno; 117 } 118 pr_err("failed to parse /proc/stat"); 119 fclose(proc); 120 return -1; 121 } 122 123 static int check_uptime(void) 124 { 125 struct timespec uptime_new, uptime_old; 126 time_t uptime_expected; 127 double prec = MAX_TEST_TIME_SEC; 128 129 if (switch_ns(parent_ns)) 130 return pr_err("switch_ns(%d)", parent_ns); 131 132 if (read_proc_uptime(&uptime_old)) 133 return 1; 134 135 if (switch_ns(child_ns)) 136 return pr_err("switch_ns(%d)", child_ns); 137 138 if (read_proc_uptime(&uptime_new)) 139 return 1; 140 141 uptime_expected = uptime_old.tv_sec + TEN_DAYS_IN_SEC; 142 if (fabs(difftime(uptime_new.tv_sec, uptime_expected)) > prec) { 143 pr_fail("uptime in /proc/uptime: old %ld, new %ld [%ld]", 144 uptime_old.tv_sec, uptime_new.tv_sec, 145 uptime_old.tv_sec + TEN_DAYS_IN_SEC); 146 return 1; 147 } 148 149 ksft_test_result_pass("Passed for /proc/uptime\n"); 150 return 0; 151 } 152 153 static int check_stat_btime(void) 154 { 155 unsigned long long btime_new, btime_old; 156 unsigned long long btime_expected; 157 158 if (switch_ns(parent_ns)) 159 return pr_err("switch_ns(%d)", parent_ns); 160 161 if (read_proc_stat_btime(&btime_old)) 162 return 1; 163 164 if (switch_ns(child_ns)) 165 return pr_err("switch_ns(%d)", child_ns); 166 167 if (read_proc_stat_btime(&btime_new)) 168 return 1; 169 170 btime_expected = btime_old - TEN_DAYS_IN_SEC; 171 if (btime_new != btime_expected) { 172 pr_fail("btime in /proc/stat: old %llu, new %llu [%llu]", 173 btime_old, btime_new, btime_expected); 174 return 1; 175 } 176 177 ksft_test_result_pass("Passed for /proc/stat btime\n"); 178 return 0; 179 } 180 181 int main(int argc, char *argv[]) 182 { 183 int ret = 0; 184 185 nscheck(); 186 187 ksft_set_plan(2); 188 189 if (init_namespaces()) 190 return 1; 191 192 ret |= check_uptime(); 193 ret |= check_stat_btime(); 194 195 if (ret) 196 ksft_exit_fail(); 197 ksft_exit_pass(); 198 return ret; 199 } 200