| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| Andy Lutomirski | 3200ca8 | 2016-11-16 10:23:28 -0800 | [diff] [blame] | 2 | /* |
| 3 | * ldt_gdt.c - Test cases for LDT and GDT access |
| 4 | * Copyright (c) 2011-2015 Andrew Lutomirski |
| 5 | */ |
| 6 | |
| 7 | #define _GNU_SOURCE |
| 8 | |
| 9 | #include <stdio.h> |
| 10 | #include <sys/time.h> |
| 11 | #include <time.h> |
| 12 | #include <stdlib.h> |
| 13 | #include <unistd.h> |
| 14 | #include <sys/syscall.h> |
| 15 | #include <dlfcn.h> |
| 16 | #include <string.h> |
| 17 | #include <errno.h> |
| 18 | #include <sched.h> |
| 19 | #include <stdbool.h> |
| 20 | |
| 21 | #ifndef SYS_getcpu |
| 22 | # ifdef __x86_64__ |
| 23 | # define SYS_getcpu 309 |
| 24 | # else |
| 25 | # define SYS_getcpu 318 |
| 26 | # endif |
| 27 | #endif |
| 28 | |
| 29 | int nerrs = 0; |
| 30 | |
| 31 | #ifdef __x86_64__ |
| 32 | # define VSYS(x) (x) |
| 33 | #else |
| 34 | # define VSYS(x) 0 |
| 35 | #endif |
| 36 | |
| 37 | typedef long (*getcpu_t)(unsigned *, unsigned *, void *); |
| 38 | |
| 39 | const getcpu_t vgetcpu = (getcpu_t)VSYS(0xffffffffff600800); |
| 40 | getcpu_t vdso_getcpu; |
| 41 | |
| 42 | void fill_function_pointers() |
| 43 | { |
| 44 | void *vdso = dlopen("linux-vdso.so.1", |
| 45 | RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD); |
| 46 | if (!vdso) |
| 47 | vdso = dlopen("linux-gate.so.1", |
| 48 | RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD); |
| 49 | if (!vdso) { |
| 50 | printf("[WARN]\tfailed to find vDSO\n"); |
| 51 | return; |
| 52 | } |
| 53 | |
| 54 | vdso_getcpu = (getcpu_t)dlsym(vdso, "__vdso_getcpu"); |
| 55 | if (!vdso_getcpu) |
| 56 | printf("Warning: failed to find getcpu in vDSO\n"); |
| 57 | } |
| 58 | |
| 59 | static long sys_getcpu(unsigned * cpu, unsigned * node, |
| 60 | void* cache) |
| 61 | { |
| 62 | return syscall(__NR_getcpu, cpu, node, cache); |
| 63 | } |
| 64 | |
| 65 | static void test_getcpu(void) |
| 66 | { |
| 67 | printf("[RUN]\tTesting getcpu...\n"); |
| 68 | |
| 69 | for (int cpu = 0; ; cpu++) { |
| 70 | cpu_set_t cpuset; |
| 71 | CPU_ZERO(&cpuset); |
| 72 | CPU_SET(cpu, &cpuset); |
| 73 | if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0) |
| 74 | return; |
| 75 | |
| 76 | unsigned cpu_sys, cpu_vdso, cpu_vsys, |
| 77 | node_sys, node_vdso, node_vsys; |
| 78 | long ret_sys, ret_vdso = 1, ret_vsys = 1; |
| 79 | unsigned node; |
| 80 | |
| 81 | ret_sys = sys_getcpu(&cpu_sys, &node_sys, 0); |
| 82 | if (vdso_getcpu) |
| 83 | ret_vdso = vdso_getcpu(&cpu_vdso, &node_vdso, 0); |
| 84 | if (vgetcpu) |
| 85 | ret_vsys = vgetcpu(&cpu_vsys, &node_vsys, 0); |
| 86 | |
| 87 | if (!ret_sys) |
| 88 | node = node_sys; |
| 89 | else if (!ret_vdso) |
| 90 | node = node_vdso; |
| 91 | else if (!ret_vsys) |
| 92 | node = node_vsys; |
| 93 | |
| 94 | bool ok = true; |
| 95 | if (!ret_sys && (cpu_sys != cpu || node_sys != node)) |
| 96 | ok = false; |
| 97 | if (!ret_vdso && (cpu_vdso != cpu || node_vdso != node)) |
| 98 | ok = false; |
| 99 | if (!ret_vsys && (cpu_vsys != cpu || node_vsys != node)) |
| 100 | ok = false; |
| 101 | |
| 102 | printf("[%s]\tCPU %u:", ok ? "OK" : "FAIL", cpu); |
| 103 | if (!ret_sys) |
| 104 | printf(" syscall: cpu %u, node %u", cpu_sys, node_sys); |
| 105 | if (!ret_vdso) |
| 106 | printf(" vdso: cpu %u, node %u", cpu_vdso, node_vdso); |
| 107 | if (!ret_vsys) |
| 108 | printf(" vsyscall: cpu %u, node %u", cpu_vsys, |
| 109 | node_vsys); |
| 110 | printf("\n"); |
| 111 | |
| 112 | if (!ok) |
| 113 | nerrs++; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | int main(int argc, char **argv) |
| 118 | { |
| 119 | fill_function_pointers(); |
| 120 | |
| 121 | test_getcpu(); |
| 122 | |
| 123 | return nerrs ? 1 : 0; |
| 124 | } |