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selftests: vDSO: vdso_test_abi: Add tests for clock_gettime64()

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To be y2038-safe, 32-bit userspace needs to explicitly call the 64-bit safe
time APIs. For this the 32-bit vDSOs contains a clock_gettime() variant
which always uses 64-bit time types.

Also test this vDSO function.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250812-vdso-tests-fixes-v2-7-90f499dd35f8@linutronix.de
This commit is contained in:
Thomas Weißschuh 2025-08-12 07:39:08 +02:00 committed by Thomas Gleixner
parent 7b87dbf9d8
commit 7262aa781f
1 changed files with 36 additions and 1 deletions
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37
tools/testing/selftests/vDSO/vdso_test_abi.c
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@ -26,8 +26,15 @@
static const char *version;
static const char **name;
/* The same as struct __kernel_timespec */
struct vdso_timespec64 {
uint64_t tv_sec;
uint64_t tv_nsec;
};
typedef long (*vdso_gettimeofday_t)(struct timeval *tv, struct timezone *tz);
typedef long (*vdso_clock_gettime_t)(clockid_t clk_id, struct timespec *ts);
typedef long (*vdso_clock_gettime64_t)(clockid_t clk_id, struct vdso_timespec64 *ts);
typedef long (*vdso_clock_getres_t)(clockid_t clk_id, struct timespec *ts);
typedef time_t (*vdso_time_t)(time_t *t);
@ -70,6 +77,33 @@ static void vdso_test_gettimeofday(void)
}
}
static void vdso_test_clock_gettime64(clockid_t clk_id)
{
/* Find clock_gettime64. */
vdso_clock_gettime64_t vdso_clock_gettime64 =
(vdso_clock_gettime64_t)vdso_sym(version, name[5]);
if (!vdso_clock_gettime64) {
ksft_print_msg("Couldn't find %s\n", name[5]);
ksft_test_result_skip("%s %s\n", name[5],
vdso_clock_name[clk_id]);
return;
}
struct vdso_timespec64 ts;
long ret = VDSO_CALL(vdso_clock_gettime64, 2, clk_id, &ts);
if (ret == 0) {
ksft_print_msg("The time is %lld.%06lld\n",
(long long)ts.tv_sec, (long long)ts.tv_nsec);
ksft_test_result_pass("%s %s\n", name[5],
vdso_clock_name[clk_id]);
} else {
ksft_test_result_fail("%s %s\n", name[5],
vdso_clock_name[clk_id]);
}
}
static void vdso_test_clock_gettime(clockid_t clk_id)
{
/* Find clock_gettime. */
@ -171,11 +205,12 @@ static inline void vdso_test_clock(clockid_t clock_id)
ksft_print_msg("clock_id: %s\n", vdso_clock_name[clock_id]);
vdso_test_clock_gettime(clock_id);
vdso_test_clock_gettime64(clock_id);
vdso_test_clock_getres(clock_id);
}
#define VDSO_TEST_PLAN 20
#define VDSO_TEST_PLAN 29
int main(int argc, char **argv)
{