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selftests: vDSO: vdso_test_correctness: Add a test for time()

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Extend the test to also cover the time() function.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260227-vdso-selftest-cleanups-v2-6-d84830fa8beb@linutronix.de
This commit is contained in:
Thomas Weißschuh
2026-02-27 07:46:01 +01:00
committed by Borislav Petkov (AMD)
parent a8b22a158a
commit bed0053a63
1 changed files with 66 additions and 0 deletions
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66
tools/testing/selftests/vDSO/vdso_test_correctness.c
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@@ -55,6 +55,10 @@ typedef long (*vgtod_t)(struct timeval *tv, struct timezone *tz);
vgtod_t vdso_gettimeofday;
typedef time_t (*vtime_t)(__kernel_time_t *tloc);
vtime_t vdso_time;
typedef long (*getcpu_t)(unsigned *, unsigned *, void *);
getcpu_t vgetcpu;
@@ -133,6 +137,10 @@ static void fill_function_pointers(void)
if (!vdso_gettimeofday)
printf("Warning: failed to find gettimeofday in vDSO\n");
vdso_time = (vtime_t)vdso_sym(version, name[2]);
if (!vdso_time)
printf("Warning: failed to find time in vDSO\n");
}
static long sys_getcpu(unsigned * cpu, unsigned * node,
@@ -156,6 +164,16 @@ static inline int sys_gettimeofday(struct timeval *tv, struct timezone *tz)
return syscall(__NR_gettimeofday, tv, tz);
}
static inline __kernel_old_time_t sys_time(__kernel_old_time_t *tloc)
{
#ifdef __NR_time
return syscall(__NR_time, tloc);
#else
errno = ENOSYS;
return -1;
#endif
}
static void test_getcpu(void)
{
printf("[RUN]\tTesting getcpu...\n");
@@ -422,6 +440,53 @@ static void test_gettimeofday(void)
VDSO_CALL(vdso_gettimeofday, 2, &vdso, NULL);
}
static void test_time(void)
{
__kernel_old_time_t start, end, vdso_ret, vdso_param;
if (!vdso_time)
return;
printf("[RUN]\tTesting time...\n");
if (sys_time(&start) < 0) {
if (errno == -ENOSYS) {
printf("[SKIP]\tNo time() support\n");
} else {
printf("[FAIL]\tsys_time failed (%d)\n", errno);
nerrs++;
}
return;
}
vdso_ret = VDSO_CALL(vdso_time, 1, &vdso_param);
end = sys_time(NULL);
if (vdso_ret < 0 || end < 0) {
printf("[FAIL]\tvDSO returned %d, syscall errno=%d\n",
(int)vdso_ret, errno);
nerrs++;
return;
}
printf("\t%lld %lld %lld\n",
(long long)start,
(long long)vdso_ret,
(long long)end);
if (vdso_ret != vdso_param) {
printf("[FAIL]\tinconsistent return values: %lld %lld\n",
(long long)vdso_ret, (long long)vdso_param);
nerrs++;
return;
}
if (!(start <= vdso_ret) || !(vdso_ret <= end)) {
printf("[FAIL]\tTimes are out of sequence\n");
nerrs++;
}
}
int main(int argc, char **argv)
{
version = versions[VDSO_VERSION];
@@ -432,6 +497,7 @@ int main(int argc, char **argv)
test_clock_gettime();
test_clock_gettime64();
test_gettimeofday();
test_time();
/*
* Test getcpu() last so that, if something goes wrong setting affinity,