343 lines
8.0 KiB
C
343 lines
8.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ldt_gdt.c - Test cases for LDT and GDT access
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* Copyright (c) 2011-2015 Andrew Lutomirski
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <sys/time.h>
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#include <time.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <dlfcn.h>
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#include <string.h>
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#include <errno.h>
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#include <sched.h>
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#include <stdbool.h>
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#include <limits.h>
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#ifndef SYS_getcpu
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# ifdef __x86_64__
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# define SYS_getcpu 309
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# else
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# define SYS_getcpu 318
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# endif
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#endif
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/* max length of lines in /proc/self/maps - anything longer is skipped here */
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#define MAPS_LINE_LEN 128
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int nerrs = 0;
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typedef int (*vgettime_t)(clockid_t, struct timespec *);
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vgettime_t vdso_clock_gettime;
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typedef long (*vgtod_t)(struct timeval *tv, struct timezone *tz);
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vgtod_t vdso_gettimeofday;
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typedef long (*getcpu_t)(unsigned *, unsigned *, void *);
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getcpu_t vgetcpu;
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getcpu_t vdso_getcpu;
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static void *vsyscall_getcpu(void)
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{
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#ifdef __x86_64__
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FILE *maps;
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char line[MAPS_LINE_LEN];
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bool found = false;
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maps = fopen("/proc/self/maps", "r");
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if (!maps) /* might still be present, but ignore it here, as we test vDSO not vsyscall */
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return NULL;
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while (fgets(line, MAPS_LINE_LEN, maps)) {
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char r, x;
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void *start, *end;
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char name[MAPS_LINE_LEN];
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/* sscanf() is safe here as strlen(name) >= strlen(line) */
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if (sscanf(line, "%p-%p %c-%cp %*x %*x:%*x %*u %s",
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&start, &end, &r, &x, name) != 5)
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continue;
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if (strcmp(name, "[vsyscall]"))
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continue;
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/* assume entries are OK, as we test vDSO here not vsyscall */
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found = true;
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break;
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}
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fclose(maps);
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if (!found) {
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printf("Warning: failed to find vsyscall getcpu\n");
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return NULL;
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}
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return (void *) (0xffffffffff600800);
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#else
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return NULL;
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#endif
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}
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static void fill_function_pointers()
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{
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void *vdso = dlopen("linux-vdso.so.1",
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RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
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if (!vdso)
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vdso = dlopen("linux-gate.so.1",
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RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
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if (!vdso) {
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printf("[WARN]\tfailed to find vDSO\n");
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return;
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}
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vdso_getcpu = (getcpu_t)dlsym(vdso, "__vdso_getcpu");
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if (!vdso_getcpu)
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printf("Warning: failed to find getcpu in vDSO\n");
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vgetcpu = (getcpu_t) vsyscall_getcpu();
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vdso_clock_gettime = (vgettime_t)dlsym(vdso, "__vdso_clock_gettime");
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if (!vdso_clock_gettime)
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printf("Warning: failed to find clock_gettime in vDSO\n");
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vdso_gettimeofday = (vgtod_t)dlsym(vdso, "__vdso_gettimeofday");
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if (!vdso_gettimeofday)
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printf("Warning: failed to find gettimeofday in vDSO\n");
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}
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static long sys_getcpu(unsigned * cpu, unsigned * node,
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void* cache)
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{
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return syscall(__NR_getcpu, cpu, node, cache);
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}
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static inline int sys_clock_gettime(clockid_t id, struct timespec *ts)
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{
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return syscall(__NR_clock_gettime, id, ts);
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}
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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 void test_getcpu(void)
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{
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printf("[RUN]\tTesting getcpu...\n");
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for (int cpu = 0; ; cpu++) {
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cpu_set_t cpuset;
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CPU_ZERO(&cpuset);
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CPU_SET(cpu, &cpuset);
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if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0)
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return;
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unsigned cpu_sys, cpu_vdso, cpu_vsys,
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node_sys, node_vdso, node_vsys;
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long ret_sys, ret_vdso = 1, ret_vsys = 1;
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unsigned node;
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ret_sys = sys_getcpu(&cpu_sys, &node_sys, 0);
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if (vdso_getcpu)
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ret_vdso = vdso_getcpu(&cpu_vdso, &node_vdso, 0);
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if (vgetcpu)
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ret_vsys = vgetcpu(&cpu_vsys, &node_vsys, 0);
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if (!ret_sys)
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node = node_sys;
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else if (!ret_vdso)
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node = node_vdso;
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else if (!ret_vsys)
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node = node_vsys;
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bool ok = true;
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if (!ret_sys && (cpu_sys != cpu || node_sys != node))
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ok = false;
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if (!ret_vdso && (cpu_vdso != cpu || node_vdso != node))
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ok = false;
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if (!ret_vsys && (cpu_vsys != cpu || node_vsys != node))
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ok = false;
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printf("[%s]\tCPU %u:", ok ? "OK" : "FAIL", cpu);
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if (!ret_sys)
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printf(" syscall: cpu %u, node %u", cpu_sys, node_sys);
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if (!ret_vdso)
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printf(" vdso: cpu %u, node %u", cpu_vdso, node_vdso);
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if (!ret_vsys)
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printf(" vsyscall: cpu %u, node %u", cpu_vsys,
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node_vsys);
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printf("\n");
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if (!ok)
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nerrs++;
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}
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}
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static bool ts_leq(const struct timespec *a, const struct timespec *b)
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{
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if (a->tv_sec != b->tv_sec)
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return a->tv_sec < b->tv_sec;
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else
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return a->tv_nsec <= b->tv_nsec;
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}
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static bool tv_leq(const struct timeval *a, const struct timeval *b)
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{
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if (a->tv_sec != b->tv_sec)
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return a->tv_sec < b->tv_sec;
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else
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return a->tv_usec <= b->tv_usec;
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}
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static char const * const clocknames[] = {
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[0] = "CLOCK_REALTIME",
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[1] = "CLOCK_MONOTONIC",
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[2] = "CLOCK_PROCESS_CPUTIME_ID",
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[3] = "CLOCK_THREAD_CPUTIME_ID",
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[4] = "CLOCK_MONOTONIC_RAW",
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[5] = "CLOCK_REALTIME_COARSE",
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[6] = "CLOCK_MONOTONIC_COARSE",
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[7] = "CLOCK_BOOTTIME",
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[8] = "CLOCK_REALTIME_ALARM",
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[9] = "CLOCK_BOOTTIME_ALARM",
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[10] = "CLOCK_SGI_CYCLE",
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[11] = "CLOCK_TAI",
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};
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static void test_one_clock_gettime(int clock, const char *name)
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{
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struct timespec start, vdso, end;
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int vdso_ret, end_ret;
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printf("[RUN]\tTesting clock_gettime for clock %s (%d)...\n", name, clock);
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if (sys_clock_gettime(clock, &start) < 0) {
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if (errno == EINVAL) {
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vdso_ret = vdso_clock_gettime(clock, &vdso);
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if (vdso_ret == -EINVAL) {
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printf("[OK]\tNo such clock.\n");
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} else {
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printf("[FAIL]\tNo such clock, but __vdso_clock_gettime returned %d\n", vdso_ret);
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nerrs++;
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}
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} else {
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printf("[WARN]\t clock_gettime(%d) syscall returned error %d\n", clock, errno);
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}
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return;
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}
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vdso_ret = vdso_clock_gettime(clock, &vdso);
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end_ret = sys_clock_gettime(clock, &end);
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if (vdso_ret != 0 || end_ret != 0) {
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printf("[FAIL]\tvDSO returned %d, syscall errno=%d\n",
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vdso_ret, errno);
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nerrs++;
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return;
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}
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printf("\t%llu.%09ld %llu.%09ld %llu.%09ld\n",
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(unsigned long long)start.tv_sec, start.tv_nsec,
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(unsigned long long)vdso.tv_sec, vdso.tv_nsec,
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(unsigned long long)end.tv_sec, end.tv_nsec);
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if (!ts_leq(&start, &vdso) || !ts_leq(&vdso, &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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static void test_clock_gettime(void)
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{
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if (!vdso_clock_gettime) {
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printf("[SKIP]\tNo vDSO, so skipping clock_gettime() tests\n");
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return;
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}
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for (int clock = 0; clock < sizeof(clocknames) / sizeof(clocknames[0]);
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clock++) {
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test_one_clock_gettime(clock, clocknames[clock]);
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}
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/* Also test some invalid clock ids */
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test_one_clock_gettime(-1, "invalid");
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test_one_clock_gettime(INT_MIN, "invalid");
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test_one_clock_gettime(INT_MAX, "invalid");
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}
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static void test_gettimeofday(void)
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{
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struct timeval start, vdso, end;
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struct timezone sys_tz, vdso_tz;
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int vdso_ret, end_ret;
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if (!vdso_gettimeofday)
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return;
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printf("[RUN]\tTesting gettimeofday...\n");
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if (sys_gettimeofday(&start, &sys_tz) < 0) {
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printf("[FAIL]\tsys_gettimeofday failed (%d)\n", errno);
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nerrs++;
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return;
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}
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vdso_ret = vdso_gettimeofday(&vdso, &vdso_tz);
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end_ret = sys_gettimeofday(&end, NULL);
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if (vdso_ret != 0 || end_ret != 0) {
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printf("[FAIL]\tvDSO returned %d, syscall errno=%d\n",
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vdso_ret, errno);
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nerrs++;
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return;
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}
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printf("\t%llu.%06ld %llu.%06ld %llu.%06ld\n",
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(unsigned long long)start.tv_sec, start.tv_usec,
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(unsigned long long)vdso.tv_sec, vdso.tv_usec,
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(unsigned long long)end.tv_sec, end.tv_usec);
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if (!tv_leq(&start, &vdso) || !tv_leq(&vdso, &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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if (sys_tz.tz_minuteswest == vdso_tz.tz_minuteswest &&
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sys_tz.tz_dsttime == vdso_tz.tz_dsttime) {
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printf("[OK]\ttimezones match: minuteswest=%d, dsttime=%d\n",
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sys_tz.tz_minuteswest, sys_tz.tz_dsttime);
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} else {
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printf("[FAIL]\ttimezones do not match\n");
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nerrs++;
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}
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/* And make sure that passing NULL for tz doesn't crash. */
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vdso_gettimeofday(&vdso, NULL);
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}
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int main(int argc, char **argv)
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{
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fill_function_pointers();
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test_clock_gettime();
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test_gettimeofday();
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/*
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* Test getcpu() last so that, if something goes wrong setting affinity,
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* we still run the other tests.
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*/
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test_getcpu();
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return nerrs ? 1 : 0;
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}
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