Commit 7262aa78 authored by Thomas Weißschuh's avatar Thomas Weißschuh Committed by Thomas Gleixner
Browse files

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



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: default avatarThomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250812-vdso-tests-fixes-v2-7-90f499dd35f8@linutronix.de
parent 7b87dbf9

tools/testing/selftests/vDSO/vdso_test_abi.c

+36 −1
Original line number Diff line number Diff line
@@ -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)

{