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selftests/timens: added selftest for /proc/stat btime 

Test that btime value of /proc/stat is as expected in the time namespace
using a simple parser to get btime from /proc/stat.

Signed-off-by: Michael Weiß <michael.weiss@aisec.fraunhofer.de>
Reviewed-by: Andrei Vagin <avagin@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20201027204258.7869-4-michael.weiss@aisec.fraunhofer.de
This commit is contained in:
Michael Weiß 2020-10-27 21:42:58 +01:00 committed by Christian Brauner
parent 3ae700ecfa
commit 716e343f01
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 57 additions and 1 deletions
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58
tools/testing/selftests/timens/procfs.c
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@ -93,6 +93,33 @@ static int read_proc_uptime(struct timespec *uptime)
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;
@ -123,18 +150,47 @@ static int check_uptime(void)
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(1);
ksft_set_plan(2);
if (init_namespaces())
return 1;
ret |= check_uptime();
ret |= check_stat_btime();
if (ret)
ksft_exit_fail();