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 static int child_ns, parent_ns; 28 29 static int switch_ns(int fd) 30 { 31 if (setns(fd, CLONE_NEWTIME)) 32 return pr_perror("setns()"); 33 34 return 0; 35 } 36 37 static int init_namespaces(void) 38 { 39 char path[] = "/proc/self/ns/time_for_children"; 40 struct stat st1, st2; 41 42 parent_ns = open(path, O_RDONLY); 43 if (parent_ns <= 0) 44 return pr_perror("Unable to open %s", path); 45 46 if (fstat(parent_ns, &st1)) 47 return pr_perror("Unable to stat the parent timens"); 48 49 if (unshare_timens()) 50 return -1; 51 52 child_ns = open(path, O_RDONLY); 53 if (child_ns <= 0) 54 return pr_perror("Unable to open %s", path); 55 56 if (fstat(child_ns, &st2)) 57 return pr_perror("Unable to stat the timens"); 58 59 if (st1.st_ino == st2.st_ino) 60 return pr_err("The same child_ns after CLONE_NEWTIME"); 61 62 if (_settime(CLOCK_BOOTTIME, TEN_DAYS_IN_SEC)) 63 return -1; 64 65 return 0; 66 } 67 68 static int read_proc_uptime(struct timespec *uptime) 69 { 70 unsigned long up_sec, up_nsec; 71 FILE *proc; 72 73 proc = fopen("/proc/uptime", "r"); 74 if (proc == NULL) { 75 pr_perror("Unable to open /proc/uptime"); 76 return -1; 77 } 78 79 if (fscanf(proc, "%lu.%02lu", &up_sec, &up_nsec) != 2) { 80 if (errno) { 81 pr_perror("fscanf"); 82 return -errno; 83 } 84 pr_err("failed to parse /proc/uptime"); 85 return -1; 86 } 87 fclose(proc); 88 89 uptime->tv_sec = up_sec; 90 uptime->tv_nsec = up_nsec; 91 return 0; 92 } 93 94 static int read_proc_stat_btime(unsigned long long *boottime_sec) 95 { 96 FILE *proc; 97 char line_buf[2048]; 98 99 proc = fopen("/proc/stat", "r"); 100 if (proc == NULL) { 101 pr_perror("Unable to open /proc/stat"); 102 return -1; 103 } 104 105 while (fgets(line_buf, 2048, proc)) { 106 if (sscanf(line_buf, "btime %llu", boottime_sec) != 1) 107 continue; 108 fclose(proc); 109 return 0; 110 } 111 if (errno) { 112 pr_perror("fscanf"); 113 fclose(proc); 114 return -errno; 115 } 116 pr_err("failed to parse /proc/stat"); 117 fclose(proc); 118 return -1; 119 } 120 121 static int check_uptime(void) 122 { 123 struct timespec uptime_new, uptime_old; 124 time_t uptime_expected; 125 double prec = MAX_TEST_TIME_SEC; 126 127 if (switch_ns(parent_ns)) 128 return pr_err("switch_ns(%d)", parent_ns); 129 130 if (read_proc_uptime(&uptime_old)) 131 return 1; 132 133 if (switch_ns(child_ns)) 134 return pr_err("switch_ns(%d)", child_ns); 135 136 if (read_proc_uptime(&uptime_new)) 137 return 1; 138 139 uptime_expected = uptime_old.tv_sec + TEN_DAYS_IN_SEC; 140 if (fabs(difftime(uptime_new.tv_sec, uptime_expected)) > prec) { 141 pr_fail("uptime in /proc/uptime: old %ld, new %ld [%ld]", 142 uptime_old.tv_sec, uptime_new.tv_sec, 143 uptime_old.tv_sec + TEN_DAYS_IN_SEC); 144 return 1; 145 } 146 147 ksft_test_result_pass("Passed for /proc/uptime\n"); 148 return 0; 149 } 150 151 static int check_stat_btime(void) 152 { 153 unsigned long long btime_new, btime_old; 154 unsigned long long btime_expected; 155 156 if (switch_ns(parent_ns)) 157 return pr_err("switch_ns(%d)", parent_ns); 158 159 if (read_proc_stat_btime(&btime_old)) 160 return 1; 161 162 if (switch_ns(child_ns)) 163 return pr_err("switch_ns(%d)", child_ns); 164 165 if (read_proc_stat_btime(&btime_new)) 166 return 1; 167 168 btime_expected = btime_old - TEN_DAYS_IN_SEC; 169 if (btime_new != btime_expected) { 170 pr_fail("btime in /proc/stat: old %llu, new %llu [%llu]", 171 btime_old, btime_new, btime_expected); 172 return 1; 173 } 174 175 ksft_test_result_pass("Passed for /proc/stat btime\n"); 176 return 0; 177 } 178 179 int main(int argc, char *argv[]) 180 { 181 int ret = 0; 182 183 nscheck(); 184 185 ksft_set_plan(2); 186 187 if (init_namespaces()) 188 return 1; 189 190 ret |= check_uptime(); 191 ret |= check_stat_btime(); 192 193 if (ret) 194 ksft_exit_fail(); 195 ksft_exit_pass(); 196 return ret; 197 } 198