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review.trustedfirmware.org / hafnium / third_party / linux / 157378f43faad830e4aa3815bde5fa9f9a9f5be6 / . / tools / testing / selftests / timens / procfs.c
blob: 7f14f0fdac84090326972b83b2a18331c252edd1 [file] [log] [blame]
Olivier Deprez157378f2022-04-04 15:47:50 +0200[diff] [blame^]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
29static int child_ns, parent_ns;
30
31static int switch_ns(int fd)
32{
33 if (setns(fd, CLONE_NEWTIME))
34 return pr_perror("setns()");
35
36 return 0;
37}
38
39static 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
70static 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
96static int check_uptime(void)
97{
98 struct timespec uptime_new, uptime_old;
99 time_t uptime_expected;
100 double prec = MAX_TEST_TIME_SEC;
101
102 if (switch_ns(parent_ns))
103 return pr_err("switch_ns(%d)", parent_ns);
104
105 if (read_proc_uptime(&uptime_old))
106 return 1;
107
108 if (switch_ns(child_ns))
109 return pr_err("switch_ns(%d)", child_ns);
110
111 if (read_proc_uptime(&uptime_new))
112 return 1;
113
114 uptime_expected = uptime_old.tv_sec + TEN_DAYS_IN_SEC;
115 if (fabs(difftime(uptime_new.tv_sec, uptime_expected)) > prec) {
116 pr_fail("uptime in /proc/uptime: old %ld, new %ld [%ld]",
117 uptime_old.tv_sec, uptime_new.tv_sec,
118 uptime_old.tv_sec + TEN_DAYS_IN_SEC);
119 return 1;
120 }
121
122 ksft_test_result_pass("Passed for /proc/uptime\n");
123 return 0;
124}
125
126int main(int argc, char *argv[])
127{
128 int ret = 0;
129
130 nscheck();
131
132 ksft_set_plan(1);
133
134 if (init_namespaces())
135 return 1;
136
137 ret |= check_uptime();
138
139 if (ret)
140 ksft_exit_fail();
141 ksft_exit_pass();
142 return ret;
143}