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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /tools/testing/selftests/timens/procfs.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/timens/procfs.c')
-rw-r--r--tools/testing/selftests/timens/procfs.c197
1 files changed, 197 insertions, 0 deletions
diff --git a/tools/testing/selftests/timens/procfs.c b/tools/testing/selftests/timens/procfs.c
new file mode 100644
index 000000000..1833ca97e
--- /dev/null
+++ b/tools/testing/selftests/timens/procfs.c
@@ -0,0 +1,197 @@
+// 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 "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)
+
+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 read_proc_stat_btime(unsigned long long *boottime_sec)
+{
+ FILE *proc;
+ char line_buf[2048];
+
+ proc = fopen("/proc/stat", "r");
+ if (proc == NULL) {
+ pr_perror("Unable to open /proc/stat");
+ return -1;
+ }
+
+ while (fgets(line_buf, 2048, proc)) {
+ if (sscanf(line_buf, "btime %llu", boottime_sec) != 1)
+ continue;
+ fclose(proc);
+ return 0;
+ }
+ if (errno) {
+ pr_perror("fscanf");
+ fclose(proc);
+ return -errno;
+ }
+ pr_err("failed to parse /proc/stat");
+ fclose(proc);
+ return -1;
+}
+
+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;
+}
+
+static int check_stat_btime(void)
+{
+ unsigned long long btime_new, btime_old;
+ unsigned long long btime_expected;
+
+ if (switch_ns(parent_ns))
+ return pr_err("switch_ns(%d)", parent_ns);
+
+ if (read_proc_stat_btime(&btime_old))
+ return 1;
+
+ if (switch_ns(child_ns))
+ return pr_err("switch_ns(%d)", child_ns);
+
+ if (read_proc_stat_btime(&btime_new))
+ return 1;
+
+ btime_expected = btime_old - TEN_DAYS_IN_SEC;
+ if (btime_new != btime_expected) {
+ pr_fail("btime in /proc/stat: old %llu, new %llu [%llu]",
+ btime_old, btime_new, btime_expected);
+ return 1;
+ }
+
+ ksft_test_result_pass("Passed for /proc/stat btime\n");
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ int ret = 0;
+
+ nscheck();
+
+ ksft_set_plan(2);
+
+ if (init_namespaces())
+ return 1;
+
+ ret |= check_uptime();
+ ret |= check_stat_btime();
+
+ if (ret)
+ ksft_exit_fail();
+ ksft_exit_pass();
+ return ret;
+}