Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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@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
authored by
Thomas Weißschuh
and committed by
Borislav Petkov (AMD)
bed0053a
a8b22a15
+66
+66
tools/testing/selftests/vDSO/vdso_test_correctness.c
+66
tools/testing/selftests/vDSO/vdso_test_correctness.c
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vgtod_t vdso_gettimeofday;
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typedef time_t (*vtime_t)(__kernel_time_t *tloc);
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vtime_t vdso_time;
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typedef long (*getcpu_t)(unsigned *, unsigned *, void *);
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getcpu_t vgetcpu;
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if (!vdso_gettimeofday)
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printf("Warning: failed to find gettimeofday in vDSO\n");
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vdso_time = (vtime_t)vdso_sym(version, name[2]);
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if (!vdso_time)
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printf("Warning: failed to find time in vDSO\n");
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}
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static long sys_getcpu(unsigned * cpu, unsigned * node,
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static inline int sys_gettimeofday(struct timeval *tv, struct timezone *tz)
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{
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return syscall(__NR_gettimeofday, tv, tz);
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}
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static inline __kernel_old_time_t sys_time(__kernel_old_time_t *tloc)
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{
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#ifdef __NR_time
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return syscall(__NR_time, tloc);
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#else
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errno = ENOSYS;
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return -1;
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#endif
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}
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static void test_getcpu(void)
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VDSO_CALL(vdso_gettimeofday, 2, &vdso, NULL);
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}
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static void test_time(void)
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{
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__kernel_old_time_t start, end, vdso_ret, vdso_param;
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if (!vdso_time)
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return;
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printf("[RUN]\tTesting time...\n");
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if (sys_time(&start) < 0) {
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if (errno == -ENOSYS) {
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printf("[SKIP]\tNo time() support\n");
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} else {
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printf("[FAIL]\tsys_time failed (%d)\n", errno);
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nerrs++;
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}
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return;
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}
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vdso_ret = VDSO_CALL(vdso_time, 1, &vdso_param);
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end = sys_time(NULL);
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if (vdso_ret < 0 || end < 0) {
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printf("[FAIL]\tvDSO returned %d, syscall errno=%d\n",
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(int)vdso_ret, errno);
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nerrs++;
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return;
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}
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printf("\t%lld %lld %lld\n",
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(long long)start,
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(long long)vdso_ret,
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(long long)end);
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if (vdso_ret != vdso_param) {
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printf("[FAIL]\tinconsistent return values: %lld %lld\n",
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(long long)vdso_ret, (long long)vdso_param);
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nerrs++;
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return;
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}
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if (!(start <= vdso_ret) || !(vdso_ret <= end)) {
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printf("[FAIL]\tTimes are out of sequence\n");
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nerrs++;
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}
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}
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int main(int argc, char **argv)
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{
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version = versions[VDSO_VERSION];
···
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test_clock_gettime();
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test_clock_gettime64();
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test_gettimeofday();
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test_time();
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/*
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* Test getcpu() last so that, if something goes wrong setting affinity,