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kselftest: Extend vdso correctness test to clock_gettime64

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With the release of Linux 5.1 has been added a new syscall,
clock_gettime64, that provided a 64 bit time value for a specified
clock_ID to make the kernel Y2038 safe on 32 bit architectures.

Extend the vdso correctness test to cover the newly exposed vdso
function.

Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Vincenzo Frascino 2020-10-26 11:49:45 +00:00 committed by Shuah Khan
parent c7e5789b24
commit b2f1c3db28
2 changed files with 115 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
tools/testing/selftests/vDSO/vdso_config.h
View File

@ -66,12 +66,13 @@ static const char *versions[6] = {
"LINUX_4.15",
};
static const char *names[2][5] = {
static const char *names[2][6] = {
{
"__kernel_gettimeofday",
"__kernel_clock_gettime",
"__kernel_time",
"__kernel_clock_getres",
"__kernel_getcpu",
#if defined(VDSO_32BIT)
"__kernel_clock_gettime64",
#endif
@ -81,6 +82,7 @@ static const char *names[2][5] = {
"__vdso_clock_gettime",
"__vdso_time",
"__vdso_clock_getres",
"__vdso_getcpu",
#if defined(VDSO_32BIT)
"__vdso_clock_gettime64",
#endif

115
tools/testing/selftests/vDSO/vdso_test_correctness.c
View File

@ -19,6 +19,10 @@
#include <stdbool.h>
#include <limits.h>
#include "vdso_config.h"
static const char **name;
#ifndef SYS_getcpu
# ifdef __x86_64__
# define SYS_getcpu 309
@ -27,6 +31,17 @@
# endif
#endif
#ifndef __NR_clock_gettime64
#define __NR_clock_gettime64 403
#endif
#ifndef __kernel_timespec
struct __kernel_timespec {
long long tv_sec;
long long tv_nsec;
};
#endif
/* max length of lines in /proc/self/maps - anything longer is skipped here */
#define MAPS_LINE_LEN 128
@ -36,6 +51,10 @@ typedef int (*vgettime_t)(clockid_t, struct timespec *);
vgettime_t vdso_clock_gettime;
typedef int (*vgettime64_t)(clockid_t, struct __kernel_timespec *);
vgettime64_t vdso_clock_gettime64;
typedef long (*vgtod_t)(struct timeval *tv, struct timezone *tz);
vgtod_t vdso_gettimeofday;
@ -99,17 +118,23 @@ static void fill_function_pointers()
return;
}
vdso_getcpu = (getcpu_t)dlsym(vdso, "__vdso_getcpu");
vdso_getcpu = (getcpu_t)dlsym(vdso, name[4]);
if (!vdso_getcpu)
printf("Warning: failed to find getcpu in vDSO\n");
vgetcpu = (getcpu_t) vsyscall_getcpu();
vdso_clock_gettime = (vgettime_t)dlsym(vdso, "__vdso_clock_gettime");
vdso_clock_gettime = (vgettime_t)dlsym(vdso, name[1]);
if (!vdso_clock_gettime)
printf("Warning: failed to find clock_gettime in vDSO\n");
vdso_gettimeofday = (vgtod_t)dlsym(vdso, "__vdso_gettimeofday");
#if defined(VDSO_32BIT)
vdso_clock_gettime64 = (vgettime64_t)dlsym(vdso, name[5]);
if (!vdso_clock_gettime64)
printf("Warning: failed to find clock_gettime64 in vDSO\n");
#endif
vdso_gettimeofday = (vgtod_t)dlsym(vdso, name[0]);
if (!vdso_gettimeofday)
printf("Warning: failed to find gettimeofday in vDSO\n");
@ -126,6 +151,11 @@ static inline int sys_clock_gettime(clockid_t id, struct timespec *ts)
return syscall(__NR_clock_gettime, id, ts);
}
static inline int sys_clock_gettime64(clockid_t id, struct __kernel_timespec *ts)
{
return syscall(__NR_clock_gettime64, id, ts);
}
static inline int sys_gettimeofday(struct timeval *tv, struct timezone *tz)
{
return syscall(__NR_gettimeofday, tv, tz);
@ -191,6 +221,15 @@ static bool ts_leq(const struct timespec *a, const struct timespec *b)
return a->tv_nsec <= b->tv_nsec;
}
static bool ts64_leq(const struct __kernel_timespec *a,
const struct __kernel_timespec *b)
{
if (a->tv_sec != b->tv_sec)
return a->tv_sec < b->tv_sec;
else
return a->tv_nsec <= b->tv_nsec;
}
static bool tv_leq(const struct timeval *a, const struct timeval *b)
{
if (a->tv_sec != b->tv_sec)
@ -254,7 +293,10 @@ static void test_one_clock_gettime(int clock, const char *name)
if (!ts_leq(&start, &vdso) || !ts_leq(&vdso, &end)) {
printf("[FAIL]\tTimes are out of sequence\n");
nerrs++;
return;
}
printf("[OK]\tTest Passed.\n");
}
static void test_clock_gettime(void)
@ -275,6 +317,70 @@ static void test_clock_gettime(void)
test_one_clock_gettime(INT_MAX, "invalid");
}
static void test_one_clock_gettime64(int clock, const char *name)
{
struct __kernel_timespec start, vdso, end;
int vdso_ret, end_ret;
printf("[RUN]\tTesting clock_gettime64 for clock %s (%d)...\n", name, clock);
if (sys_clock_gettime64(clock, &start) < 0) {
if (errno == EINVAL) {
vdso_ret = vdso_clock_gettime64(clock, &vdso);
if (vdso_ret == -EINVAL) {
printf("[OK]\tNo such clock.\n");
} else {
printf("[FAIL]\tNo such clock, but __vdso_clock_gettime64 returned %d\n", vdso_ret);
nerrs++;
}
} else {
printf("[WARN]\t clock_gettime64(%d) syscall returned error %d\n", clock, errno);
}
return;
}
vdso_ret = vdso_clock_gettime64(clock, &vdso);
end_ret = sys_clock_gettime64(clock, &end);
if (vdso_ret != 0 || end_ret != 0) {
printf("[FAIL]\tvDSO returned %d, syscall errno=%d\n",
vdso_ret, errno);
nerrs++;
return;
}
printf("\t%llu.%09ld %llu.%09ld %llu.%09ld\n",
(unsigned long long)start.tv_sec, start.tv_nsec,
(unsigned long long)vdso.tv_sec, vdso.tv_nsec,
(unsigned long long)end.tv_sec, end.tv_nsec);
if (!ts64_leq(&start, &vdso) || !ts64_leq(&vdso, &end)) {
printf("[FAIL]\tTimes are out of sequence\n");
nerrs++;
return;
}
printf("[OK]\tTest Passed.\n");
}
static void test_clock_gettime64(void)
{
if (!vdso_clock_gettime64) {
printf("[SKIP]\tNo vDSO, so skipping clock_gettime64() tests\n");
return;
}
for (int clock = 0; clock < sizeof(clocknames) / sizeof(clocknames[0]);
clock++) {
test_one_clock_gettime64(clock, clocknames[clock]);
}
/* Also test some invalid clock ids */
test_one_clock_gettime64(-1, "invalid");
test_one_clock_gettime64(INT_MIN, "invalid");
test_one_clock_gettime64(INT_MAX, "invalid");
}
static void test_gettimeofday(void)
{
struct timeval start, vdso, end;
@ -327,9 +433,12 @@ static void test_gettimeofday(void)
int main(int argc, char **argv)
{
name = (const char **)&names[VDSO_NAMES];
fill_function_pointers();
test_clock_gettime();
test_clock_gettime64();
test_gettimeofday();
/*