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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | // SPDX-License-Identifier: GPL-2.0 #define _GNU_SOURCE #include <errno.h> #include <fcntl.h> #include <math.h> #include <sched.h> #include <stdio.h> #include <stdbool.h> #include <stdlib.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" #include "timens.h" /* * 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 MAX_TEST_TIME_SEC (60*5) #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])) static int child_ns, parent_ns; static int switch_ns(int fd) { if (setns(fd, CLONE_NEWTIME)) return pr_perror("setns()"); return 0; } static int init_namespaces(void) { char path[] = "/proc/self/ns/time_for_children"; 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_timens()) return -1; 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_err("The same child_ns after CLONE_NEWTIME"); if (_settime(CLOCK_BOOTTIME, TEN_DAYS_IN_SEC)) return -1; return 0; } static int read_proc_uptime(struct timespec *uptime) { unsigned long up_sec, up_nsec; FILE *proc; proc = fopen("/proc/uptime", "r"); if (proc == NULL) { pr_perror("Unable to open /proc/uptime"); return -1; } if (fscanf(proc, "%lu.%02lu", &up_sec, &up_nsec) != 2) { if (errno) { pr_perror("fscanf"); return -errno; } pr_err("failed to parse /proc/uptime"); return -1; } fclose(proc); uptime->tv_sec = up_sec; uptime->tv_nsec = up_nsec; return 0; } static int check_uptime(void) { struct timespec uptime_new, uptime_old; time_t uptime_expected; double prec = MAX_TEST_TIME_SEC; if (switch_ns(parent_ns)) return pr_err("switch_ns(%d)", parent_ns); if (read_proc_uptime(&uptime_old)) return 1; if (switch_ns(child_ns)) return pr_err("switch_ns(%d)", child_ns); if (read_proc_uptime(&uptime_new)) return 1; uptime_expected = uptime_old.tv_sec + TEN_DAYS_IN_SEC; if (fabs(difftime(uptime_new.tv_sec, uptime_expected)) > prec) { pr_fail("uptime in /proc/uptime: old %ld, new %ld [%ld]", uptime_old.tv_sec, uptime_new.tv_sec, uptime_old.tv_sec + TEN_DAYS_IN_SEC); return 1; } ksft_test_result_pass("Passed for /proc/uptime\n"); return 0; } int main(int argc, char *argv[]) { int ret = 0; nscheck(); ksft_set_plan(1); if (init_namespaces()) return 1; ret |= check_uptime(); if (ret) ksft_exit_fail(); ksft_exit_pass(); return ret; } |