338 lines
7.9 KiB
C
338 lines
7.9 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* ldt_gdt.c - Test cases for LDT and GDT access
|
||
|
|
* Copyright (c) 2011-2015 Andrew Lutomirski
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define _GNU_SOURCE
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <sys/time.h>
|
||
|
|
#include <time.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <sys/syscall.h>
|
||
|
|
#include <dlfcn.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <errno.h>
|
||
|
|
#include <sched.h>
|
||
|
|
#include <stdbool.h>
|
||
|
|
#include <limits.h>
|
||
|
|
|
||
|
|
#ifndef SYS_getcpu
|
||
|
|
# ifdef __x86_64__
|
||
|
|
# define SYS_getcpu 309
|
||
|
|
# else
|
||
|
|
# define SYS_getcpu 318
|
||
|
|
# endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* max length of lines in /proc/self/maps - anything longer is skipped here */
|
||
|
|
#define MAPS_LINE_LEN 128
|
||
|
|
|
||
|
|
int nerrs = 0;
|
||
|
|
|
||
|
|
typedef int (*vgettime_t)(clockid_t, struct timespec *);
|
||
|
|
|
||
|
|
vgettime_t vdso_clock_gettime;
|
||
|
|
|
||
|
|
typedef long (*vgtod_t)(struct timeval *tv, struct timezone *tz);
|
||
|
|
|
||
|
|
vgtod_t vdso_gettimeofday;
|
||
|
|
|
||
|
|
typedef long (*getcpu_t)(unsigned *, unsigned *, void *);
|
||
|
|
|
||
|
|
getcpu_t vgetcpu;
|
||
|
|
getcpu_t vdso_getcpu;
|
||
|
|
|
||
|
|
static void *vsyscall_getcpu(void)
|
||
|
|
{
|
||
|
|
#ifdef __x86_64__
|
||
|
|
FILE *maps;
|
||
|
|
char line[MAPS_LINE_LEN];
|
||
|
|
bool found = false;
|
||
|
|
|
||
|
|
maps = fopen("/proc/self/maps", "r");
|
||
|
|
if (!maps) /* might still be present, but ignore it here, as we test vDSO not vsyscall */
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
while (fgets(line, MAPS_LINE_LEN, maps)) {
|
||
|
|
char r, x;
|
||
|
|
void *start, *end;
|
||
|
|
char name[MAPS_LINE_LEN];
|
||
|
|
|
||
|
|
/* sscanf() is safe here as strlen(name) >= strlen(line) */
|
||
|
|
if (sscanf(line, "%p-%p %c-%cp %*x %*x:%*x %*u %s",
|
||
|
|
&start, &end, &r, &x, name) != 5)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
if (strcmp(name, "[vsyscall]"))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
/* assume entries are OK, as we test vDSO here not vsyscall */
|
||
|
|
found = true;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
fclose(maps);
|
||
|
|
|
||
|
|
if (!found) {
|
||
|
|
printf("Warning: failed to find vsyscall getcpu\n");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
return (void *) (0xffffffffff600800);
|
||
|
|
#else
|
||
|
|
return NULL;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void fill_function_pointers()
|
||
|
|
{
|
||
|
|
void *vdso = dlopen("linux-vdso.so.1",
|
||
|
|
RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
|
||
|
|
if (!vdso)
|
||
|
|
vdso = dlopen("linux-gate.so.1",
|
||
|
|
RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
|
||
|
|
if (!vdso) {
|
||
|
|
printf("[WARN]\tfailed to find vDSO\n");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
vdso_getcpu = (getcpu_t)dlsym(vdso, "__vdso_getcpu");
|
||
|
|
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");
|
||
|
|
if (!vdso_clock_gettime)
|
||
|
|
printf("Warning: failed to find clock_gettime in vDSO\n");
|
||
|
|
|
||
|
|
vdso_gettimeofday = (vgtod_t)dlsym(vdso, "__vdso_gettimeofday");
|
||
|
|
if (!vdso_gettimeofday)
|
||
|
|
printf("Warning: failed to find gettimeofday in vDSO\n");
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
static long sys_getcpu(unsigned * cpu, unsigned * node,
|
||
|
|
void* cache)
|
||
|
|
{
|
||
|
|
return syscall(__NR_getcpu, cpu, node, cache);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int sys_clock_gettime(clockid_t id, struct timespec *ts)
|
||
|
|
{
|
||
|
|
return syscall(__NR_clock_gettime, id, ts);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int sys_gettimeofday(struct timeval *tv, struct timezone *tz)
|
||
|
|
{
|
||
|
|
return syscall(__NR_gettimeofday, tv, tz);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void test_getcpu(void)
|
||
|
|
{
|
||
|
|
printf("[RUN]\tTesting getcpu...\n");
|
||
|
|
|
||
|
|
for (int cpu = 0; ; cpu++) {
|
||
|
|
cpu_set_t cpuset;
|
||
|
|
CPU_ZERO(&cpuset);
|
||
|
|
CPU_SET(cpu, &cpuset);
|
||
|
|
if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
unsigned cpu_sys, cpu_vdso, cpu_vsys,
|
||
|
|
node_sys, node_vdso, node_vsys;
|
||
|
|
long ret_sys, ret_vdso = 1, ret_vsys = 1;
|
||
|
|
unsigned node;
|
||
|
|
|
||
|
|
ret_sys = sys_getcpu(&cpu_sys, &node_sys, 0);
|
||
|
|
if (vdso_getcpu)
|
||
|
|
ret_vdso = vdso_getcpu(&cpu_vdso, &node_vdso, 0);
|
||
|
|
if (vgetcpu)
|
||
|
|
ret_vsys = vgetcpu(&cpu_vsys, &node_vsys, 0);
|
||
|
|
|
||
|
|
if (!ret_sys)
|
||
|
|
node = node_sys;
|
||
|
|
else if (!ret_vdso)
|
||
|
|
node = node_vdso;
|
||
|
|
else if (!ret_vsys)
|
||
|
|
node = node_vsys;
|
||
|
|
|
||
|
|
bool ok = true;
|
||
|
|
if (!ret_sys && (cpu_sys != cpu || node_sys != node))
|
||
|
|
ok = false;
|
||
|
|
if (!ret_vdso && (cpu_vdso != cpu || node_vdso != node))
|
||
|
|
ok = false;
|
||
|
|
if (!ret_vsys && (cpu_vsys != cpu || node_vsys != node))
|
||
|
|
ok = false;
|
||
|
|
|
||
|
|
printf("[%s]\tCPU %u:", ok ? "OK" : "FAIL", cpu);
|
||
|
|
if (!ret_sys)
|
||
|
|
printf(" syscall: cpu %u, node %u", cpu_sys, node_sys);
|
||
|
|
if (!ret_vdso)
|
||
|
|
printf(" vdso: cpu %u, node %u", cpu_vdso, node_vdso);
|
||
|
|
if (!ret_vsys)
|
||
|
|
printf(" vsyscall: cpu %u, node %u", cpu_vsys,
|
||
|
|
node_vsys);
|
||
|
|
printf("\n");
|
||
|
|
|
||
|
|
if (!ok)
|
||
|
|
nerrs++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool ts_leq(const struct timespec *a, const struct 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)
|
||
|
|
return a->tv_sec < b->tv_sec;
|
||
|
|
else
|
||
|
|
return a->tv_usec <= b->tv_usec;
|
||
|
|
}
|
||
|
|
|
||
|
|
static char const * const clocknames[] = {
|
||
|
|
[0] = "CLOCK_REALTIME",
|
||
|
|
[1] = "CLOCK_MONOTONIC",
|
||
|
|
[2] = "CLOCK_PROCESS_CPUTIME_ID",
|
||
|
|
[3] = "CLOCK_THREAD_CPUTIME_ID",
|
||
|
|
[4] = "CLOCK_MONOTONIC_RAW",
|
||
|
|
[5] = "CLOCK_REALTIME_COARSE",
|
||
|
|
[6] = "CLOCK_MONOTONIC_COARSE",
|
||
|
|
[7] = "CLOCK_BOOTTIME",
|
||
|
|
[8] = "CLOCK_REALTIME_ALARM",
|
||
|
|
[9] = "CLOCK_BOOTTIME_ALARM",
|
||
|
|
[10] = "CLOCK_SGI_CYCLE",
|
||
|
|
[11] = "CLOCK_TAI",
|
||
|
|
};
|
||
|
|
|
||
|
|
static void test_one_clock_gettime(int clock, const char *name)
|
||
|
|
{
|
||
|
|
struct timespec start, vdso, end;
|
||
|
|
int vdso_ret, end_ret;
|
||
|
|
|
||
|
|
printf("[RUN]\tTesting clock_gettime for clock %s (%d)...\n", name, clock);
|
||
|
|
|
||
|
|
if (sys_clock_gettime(clock, &start) < 0) {
|
||
|
|
if (errno == EINVAL) {
|
||
|
|
vdso_ret = vdso_clock_gettime(clock, &vdso);
|
||
|
|
if (vdso_ret == -EINVAL) {
|
||
|
|
printf("[OK]\tNo such clock.\n");
|
||
|
|
} else {
|
||
|
|
printf("[FAIL]\tNo such clock, but __vdso_clock_gettime returned %d\n", vdso_ret);
|
||
|
|
nerrs++;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
printf("[WARN]\t clock_gettime(%d) syscall returned error %d\n", clock, errno);
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
vdso_ret = vdso_clock_gettime(clock, &vdso);
|
||
|
|
end_ret = sys_clock_gettime(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 (!ts_leq(&start, &vdso) || !ts_leq(&vdso, &end)) {
|
||
|
|
printf("[FAIL]\tTimes are out of sequence\n");
|
||
|
|
nerrs++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void test_clock_gettime(void)
|
||
|
|
{
|
||
|
|
for (int clock = 0; clock < sizeof(clocknames) / sizeof(clocknames[0]);
|
||
|
|
clock++) {
|
||
|
|
test_one_clock_gettime(clock, clocknames[clock]);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Also test some invalid clock ids */
|
||
|
|
test_one_clock_gettime(-1, "invalid");
|
||
|
|
test_one_clock_gettime(INT_MIN, "invalid");
|
||
|
|
test_one_clock_gettime(INT_MAX, "invalid");
|
||
|
|
}
|
||
|
|
|
||
|
|
static void test_gettimeofday(void)
|
||
|
|
{
|
||
|
|
struct timeval start, vdso, end;
|
||
|
|
struct timezone sys_tz, vdso_tz;
|
||
|
|
int vdso_ret, end_ret;
|
||
|
|
|
||
|
|
if (!vdso_gettimeofday)
|
||
|
|
return;
|
||
|
|
|
||
|
|
printf("[RUN]\tTesting gettimeofday...\n");
|
||
|
|
|
||
|
|
if (sys_gettimeofday(&start, &sys_tz) < 0) {
|
||
|
|
printf("[FAIL]\tsys_gettimeofday failed (%d)\n", errno);
|
||
|
|
nerrs++;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
vdso_ret = vdso_gettimeofday(&vdso, &vdso_tz);
|
||
|
|
end_ret = sys_gettimeofday(&end, NULL);
|
||
|
|
|
||
|
|
if (vdso_ret != 0 || end_ret != 0) {
|
||
|
|
printf("[FAIL]\tvDSO returned %d, syscall errno=%d\n",
|
||
|
|
vdso_ret, errno);
|
||
|
|
nerrs++;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
printf("\t%llu.%06ld %llu.%06ld %llu.%06ld\n",
|
||
|
|
(unsigned long long)start.tv_sec, start.tv_usec,
|
||
|
|
(unsigned long long)vdso.tv_sec, vdso.tv_usec,
|
||
|
|
(unsigned long long)end.tv_sec, end.tv_usec);
|
||
|
|
|
||
|
|
if (!tv_leq(&start, &vdso) || !tv_leq(&vdso, &end)) {
|
||
|
|
printf("[FAIL]\tTimes are out of sequence\n");
|
||
|
|
nerrs++;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (sys_tz.tz_minuteswest == vdso_tz.tz_minuteswest &&
|
||
|
|
sys_tz.tz_dsttime == vdso_tz.tz_dsttime) {
|
||
|
|
printf("[OK]\ttimezones match: minuteswest=%d, dsttime=%d\n",
|
||
|
|
sys_tz.tz_minuteswest, sys_tz.tz_dsttime);
|
||
|
|
} else {
|
||
|
|
printf("[FAIL]\ttimezones do not match\n");
|
||
|
|
nerrs++;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* And make sure that passing NULL for tz doesn't crash. */
|
||
|
|
vdso_gettimeofday(&vdso, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
fill_function_pointers();
|
||
|
|
|
||
|
|
test_clock_gettime();
|
||
|
|
test_gettimeofday();
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Test getcpu() last so that, if something goes wrong setting affinity,
|
||
|
|
* we still run the other tests.
|
||
|
|
*/
|
||
|
|
test_getcpu();
|
||
|
|
|
||
|
|
return nerrs ? 1 : 0;
|
||
|
|
}
|