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 #include <time.h> 16 17 #include "log.h" 18 #include "timens.h" 19 20 /* 21 * Test shouldn't be run for a day, so add 10 days to child 22 * time and check parent's time to be in the same day. 23 */ 24 #define MAX_TEST_TIME_SEC (60*5) 25 #define DAY_IN_SEC (60*60*24) 26 #define TEN_DAYS_IN_SEC (10*DAY_IN_SEC) 27 28 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) 29 30 static int child_ns, parent_ns; 31 32 static int switch_ns(int fd) 33 { 34 if (setns(fd, CLONE_NEWTIME)) 35 return pr_perror("setns()"); 36 37 return 0; 38 } 39 40 static int init_namespaces(void) 41 { 42 char path[] = "/proc/self/ns/time_for_children"; 43 struct stat st1, st2; 44 45 parent_ns = open(path, O_RDONLY); 46 if (parent_ns <= 0) 47 return pr_perror("Unable to open %s", path); 48 49 if (fstat(parent_ns, &st1)) 50 return pr_perror("Unable to stat the parent timens"); 51 52 if (unshare_timens()) 53 return -1; 54 55 child_ns = open(path, O_RDONLY); 56 if (child_ns <= 0) 57 return pr_perror("Unable to open %s", path); 58 59 if (fstat(child_ns, &st2)) 60 return pr_perror("Unable to stat the timens"); 61 62 if (st1.st_ino == st2.st_ino) 63 return pr_err("The same child_ns after CLONE_NEWTIME"); 64 65 if (_settime(CLOCK_BOOTTIME, TEN_DAYS_IN_SEC)) 66 return -1; 67 68 return 0; 69 } 70 71 static int read_proc_uptime(struct timespec *uptime) 72 { 73 unsigned long up_sec, up_nsec; 74 FILE *proc; 75 76 proc = fopen("/proc/uptime", "r"); 77 if (proc == NULL) { 78 pr_perror("Unable to open /proc/uptime"); 79 return -1; 80 } 81 82 if (fscanf(proc, "%lu.%02lu", &up_sec, &up_nsec) != 2) { 83 if (errno) { 84 pr_perror("fscanf"); 85 return -errno; 86 } 87 pr_err("failed to parse /proc/uptime"); 88 return -1; 89 } 90 fclose(proc); 91 92 uptime->tv_sec = up_sec; 93 uptime->tv_nsec = up_nsec; 94 return 0; 95 } 96 97 static int check_uptime(void) 98 { 99 struct timespec uptime_new, uptime_old; 100 time_t uptime_expected; 101 double prec = MAX_TEST_TIME_SEC; 102 103 if (switch_ns(parent_ns)) 104 return pr_err("switch_ns(%d)", parent_ns); 105 106 if (read_proc_uptime(&uptime_old)) 107 return 1; 108 109 if (switch_ns(child_ns)) 110 return pr_err("switch_ns(%d)", child_ns); 111 112 if (read_proc_uptime(&uptime_new)) 113 return 1; 114 115 uptime_expected = uptime_old.tv_sec + TEN_DAYS_IN_SEC; 116 if (fabs(difftime(uptime_new.tv_sec, uptime_expected)) > prec) { 117 pr_fail("uptime in /proc/uptime: old %ld, new %ld [%ld]", 118 uptime_old.tv_sec, uptime_new.tv_sec, 119 uptime_old.tv_sec + TEN_DAYS_IN_SEC); 120 return 1; 121 } 122 123 ksft_test_result_pass("Passed for /proc/uptime\n"); 124 return 0; 125 } 126 127 int main(int argc, char *argv[]) 128 { 129 int ret = 0; 130 131 nscheck(); 132 133 ksft_set_plan(1); 134 135 if (init_namespaces()) 136 return 1; 137 138 ret |= check_uptime(); 139 140 if (ret) 141 ksft_exit_fail(); 142 ksft_exit_pass(); 143 return ret; 144 } 145