linux-kernel - [PATCH v2 14/14] selftests: vDSO: vdso_test

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Message-Id: <20251113-vdso-test-types-v2-14-0427eff70d08@linutronix.de>
Date: Thu, 13 Nov 2025 16:30:30 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Vincenzo Frascino <vincenzo.frascino@....com>, 
 Shuah Khan <shuah@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v2 14/14] selftests: vDSO: vdso_test_correctness: Add a
 test for time()

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

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 .../testing/selftests/vDSO/vdso_test_correctness.c | 49 ++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/tools/testing/selftests/vDSO/vdso_test_correctness.c b/tools/testing/selftests/vDSO/vdso_test_correctness.c
index 310688e1379511e2c564b460c6379cc00b7a5f9a..67cb8f11aa3c6977616def286b9a7d35fa6579e7 100644
--- a/tools/testing/selftests/vDSO/vdso_test_correctness.c
+++ b/tools/testing/selftests/vDSO/vdso_test_correctness.c
@@ -40,6 +40,7 @@ int nerrs = 0;
 vdso_clock_gettime_t vdso_clock_gettime;
 vdso_clock_gettime64_t vdso_clock_gettime64;
 vdso_gettimeofday_t vdso_gettimeofday;
+vdso_time_t vdso_time;
 
 typedef long (*getcpu_t)(unsigned *, unsigned *, void *);
 
@@ -119,6 +120,10 @@ static void fill_function_pointers(void)
 	if (!vdso_gettimeofday)
 		printf("Warning: failed to find gettimeofday in vDSO\n");
 
+	vdso_time = (vdso_time_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,
@@ -391,6 +396,49 @@ 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) {
+		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];
@@ -401,6 +449,7 @@ 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,

-- 
2.51.0