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145
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1 //===-- sanitizer_posix_libcdep.cpp ---------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file is shared between AddressSanitizer and ThreadSanitizer
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10 // run-time libraries and implements libc-dependent POSIX-specific functions
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11 // from sanitizer_libc.h.
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "sanitizer_platform.h"
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15
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16 #if SANITIZER_POSIX
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17
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18 #include "sanitizer_common.h"
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19 #include "sanitizer_flags.h"
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20 #include "sanitizer_platform_limits_netbsd.h"
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21 #include "sanitizer_platform_limits_openbsd.h"
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22 #include "sanitizer_platform_limits_posix.h"
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23 #include "sanitizer_platform_limits_solaris.h"
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24 #include "sanitizer_posix.h"
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25 #include "sanitizer_procmaps.h"
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26
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27 #include <errno.h>
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28 #include <fcntl.h>
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29 #include <pthread.h>
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30 #include <signal.h>
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31 #include <stdlib.h>
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32 #include <sys/mman.h>
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33 #include <sys/resource.h>
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34 #include <sys/stat.h>
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35 #include <sys/time.h>
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36 #include <sys/types.h>
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37 #include <sys/wait.h>
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38 #include <unistd.h>
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39
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40 #if SANITIZER_FREEBSD
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41 // The MAP_NORESERVE define has been removed in FreeBSD 11.x, and even before
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42 // that, it was never implemented. So just define it to zero.
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43 #undef MAP_NORESERVE
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44 #define MAP_NORESERVE 0
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45 #endif
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46
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47 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
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48
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49 namespace __sanitizer {
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50
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51 u32 GetUid() {
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52 return getuid();
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53 }
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54
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55 uptr GetThreadSelf() {
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56 return (uptr)pthread_self();
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57 }
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58
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59 void ReleaseMemoryPagesToOS(uptr beg, uptr end) {
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60 uptr page_size = GetPageSizeCached();
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61 uptr beg_aligned = RoundUpTo(beg, page_size);
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62 uptr end_aligned = RoundDownTo(end, page_size);
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63 if (beg_aligned < end_aligned)
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64 // In the default Solaris compilation environment, madvise() is declared
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65 // to take a caddr_t arg; casting it to void * results in an invalid
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66 // conversion error, so use char * instead.
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67 madvise((char *)beg_aligned, end_aligned - beg_aligned,
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68 SANITIZER_MADVISE_DONTNEED);
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69 }
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70
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71 void SetShadowRegionHugePageMode(uptr addr, uptr size) {
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72 #ifdef MADV_NOHUGEPAGE // May not be defined on old systems.
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73 if (common_flags()->no_huge_pages_for_shadow)
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74 madvise((char *)addr, size, MADV_NOHUGEPAGE);
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75 else
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76 madvise((char *)addr, size, MADV_HUGEPAGE);
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77 #endif // MADV_NOHUGEPAGE
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78 }
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79
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80 bool DontDumpShadowMemory(uptr addr, uptr length) {
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81 #if defined(MADV_DONTDUMP)
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82 return madvise((char *)addr, length, MADV_DONTDUMP) == 0;
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83 #elif defined(MADV_NOCORE)
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84 return madvise((char *)addr, length, MADV_NOCORE) == 0;
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85 #else
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86 return true;
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87 #endif // MADV_DONTDUMP
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88 }
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89
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90 static rlim_t getlim(int res) {
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91 rlimit rlim;
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92 CHECK_EQ(0, getrlimit(res, &rlim));
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93 return rlim.rlim_cur;
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94 }
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95
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96 static void setlim(int res, rlim_t lim) {
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97 struct rlimit rlim;
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98 if (getrlimit(res, const_cast<struct rlimit *>(&rlim))) {
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99 Report("ERROR: %s getrlimit() failed %d\n", SanitizerToolName, errno);
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100 Die();
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101 }
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102 rlim.rlim_cur = lim;
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103 if (setrlimit(res, const_cast<struct rlimit *>(&rlim))) {
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104 Report("ERROR: %s setrlimit() failed %d\n", SanitizerToolName, errno);
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105 Die();
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106 }
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107 }
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108
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109 void DisableCoreDumperIfNecessary() {
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110 if (common_flags()->disable_coredump) {
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111 setlim(RLIMIT_CORE, 0);
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112 }
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113 }
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114
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115 bool StackSizeIsUnlimited() {
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116 rlim_t stack_size = getlim(RLIMIT_STACK);
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117 return (stack_size == RLIM_INFINITY);
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118 }
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119
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120 void SetStackSizeLimitInBytes(uptr limit) {
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121 setlim(RLIMIT_STACK, (rlim_t)limit);
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122 CHECK(!StackSizeIsUnlimited());
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123 }
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124
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125 bool AddressSpaceIsUnlimited() {
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126 rlim_t as_size = getlim(RLIMIT_AS);
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127 return (as_size == RLIM_INFINITY);
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128 }
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129
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130 void SetAddressSpaceUnlimited() {
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131 setlim(RLIMIT_AS, RLIM_INFINITY);
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132 CHECK(AddressSpaceIsUnlimited());
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133 }
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134
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135 void SleepForSeconds(int seconds) {
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136 sleep(seconds);
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137 }
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138
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139 void SleepForMillis(int millis) {
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140 usleep(millis * 1000);
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141 }
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142
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143 void Abort() {
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144 #if !SANITIZER_GO
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145 // If we are handling SIGABRT, unhandle it first.
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146 // TODO(vitalybuka): Check if handler belongs to sanitizer.
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147 if (GetHandleSignalMode(SIGABRT) != kHandleSignalNo) {
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148 struct sigaction sigact;
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149 internal_memset(&sigact, 0, sizeof(sigact));
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150 sigact.sa_sigaction = (sa_sigaction_t)SIG_DFL;
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151 internal_sigaction(SIGABRT, &sigact, nullptr);
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152 }
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153 #endif
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154
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155 abort();
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156 }
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157
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158 int Atexit(void (*function)(void)) {
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159 #if !SANITIZER_GO
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160 return atexit(function);
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161 #else
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162 return 0;
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163 #endif
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164 }
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165
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166 bool SupportsColoredOutput(fd_t fd) {
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167 return isatty(fd) != 0;
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168 }
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169
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170 #if !SANITIZER_GO
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171 // TODO(glider): different tools may require different altstack size.
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172 static const uptr kAltStackSize = SIGSTKSZ * 4; // SIGSTKSZ is not enough.
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173
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174 void SetAlternateSignalStack() {
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175 stack_t altstack, oldstack;
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176 CHECK_EQ(0, sigaltstack(nullptr, &oldstack));
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177 // If the alternate stack is already in place, do nothing.
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178 // Android always sets an alternate stack, but it's too small for us.
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179 if (!SANITIZER_ANDROID && !(oldstack.ss_flags & SS_DISABLE)) return;
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180 // TODO(glider): the mapped stack should have the MAP_STACK flag in the
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181 // future. It is not required by man 2 sigaltstack now (they're using
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182 // malloc()).
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183 void* base = MmapOrDie(kAltStackSize, __func__);
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184 altstack.ss_sp = (char*) base;
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185 altstack.ss_flags = 0;
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186 altstack.ss_size = kAltStackSize;
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187 CHECK_EQ(0, sigaltstack(&altstack, nullptr));
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188 }
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189
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190 void UnsetAlternateSignalStack() {
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191 stack_t altstack, oldstack;
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192 altstack.ss_sp = nullptr;
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193 altstack.ss_flags = SS_DISABLE;
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194 altstack.ss_size = kAltStackSize; // Some sane value required on Darwin.
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195 CHECK_EQ(0, sigaltstack(&altstack, &oldstack));
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196 UnmapOrDie(oldstack.ss_sp, oldstack.ss_size);
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197 }
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198
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199 static void MaybeInstallSigaction(int signum,
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200 SignalHandlerType handler) {
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201 if (GetHandleSignalMode(signum) == kHandleSignalNo) return;
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202
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203 struct sigaction sigact;
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204 internal_memset(&sigact, 0, sizeof(sigact));
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205 sigact.sa_sigaction = (sa_sigaction_t)handler;
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206 // Do not block the signal from being received in that signal's handler.
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207 // Clients are responsible for handling this correctly.
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208 sigact.sa_flags = SA_SIGINFO | SA_NODEFER;
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209 if (common_flags()->use_sigaltstack) sigact.sa_flags |= SA_ONSTACK;
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210 CHECK_EQ(0, internal_sigaction(signum, &sigact, nullptr));
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211 VReport(1, "Installed the sigaction for signal %d\n", signum);
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212 }
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213
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214 void InstallDeadlySignalHandlers(SignalHandlerType handler) {
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215 // Set the alternate signal stack for the main thread.
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216 // This will cause SetAlternateSignalStack to be called twice, but the stack
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217 // will be actually set only once.
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218 if (common_flags()->use_sigaltstack) SetAlternateSignalStack();
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219 MaybeInstallSigaction(SIGSEGV, handler);
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220 MaybeInstallSigaction(SIGBUS, handler);
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221 MaybeInstallSigaction(SIGABRT, handler);
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222 MaybeInstallSigaction(SIGFPE, handler);
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223 MaybeInstallSigaction(SIGILL, handler);
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224 MaybeInstallSigaction(SIGTRAP, handler);
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225 }
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226
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227 bool SignalContext::IsStackOverflow() const {
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228 // Access at a reasonable offset above SP, or slightly below it (to account
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229 // for x86_64 or PowerPC redzone, ARM push of multiple registers, etc) is
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230 // probably a stack overflow.
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231 #ifdef __s390__
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232 // On s390, the fault address in siginfo points to start of the page, not
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233 // to the precise word that was accessed. Mask off the low bits of sp to
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234 // take it into account.
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235 bool IsStackAccess = addr >= (sp & ~0xFFF) && addr < sp + 0xFFFF;
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236 #else
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237 // Let's accept up to a page size away from top of stack. Things like stack
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238 // probing can trigger accesses with such large offsets.
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239 bool IsStackAccess = addr + GetPageSizeCached() > sp && addr < sp + 0xFFFF;
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240 #endif
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241
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242 #if __powerpc__
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243 // Large stack frames can be allocated with e.g.
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244 // lis r0,-10000
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245 // stdux r1,r1,r0 # store sp to [sp-10000] and update sp by -10000
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246 // If the store faults then sp will not have been updated, so test above
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247 // will not work, because the fault address will be more than just "slightly"
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248 // below sp.
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249 if (!IsStackAccess && IsAccessibleMemoryRange(pc, 4)) {
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250 u32 inst = *(unsigned *)pc;
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251 u32 ra = (inst >> 16) & 0x1F;
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252 u32 opcd = inst >> 26;
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253 u32 xo = (inst >> 1) & 0x3FF;
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254 // Check for store-with-update to sp. The instructions we accept are:
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255 // stbu rs,d(ra) stbux rs,ra,rb
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256 // sthu rs,d(ra) sthux rs,ra,rb
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257 // stwu rs,d(ra) stwux rs,ra,rb
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258 // stdu rs,ds(ra) stdux rs,ra,rb
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259 // where ra is r1 (the stack pointer).
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260 if (ra == 1 &&
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261 (opcd == 39 || opcd == 45 || opcd == 37 || opcd == 62 ||
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262 (opcd == 31 && (xo == 247 || xo == 439 || xo == 183 || xo == 181))))
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263 IsStackAccess = true;
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264 }
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265 #endif // __powerpc__
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266
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267 // We also check si_code to filter out SEGV caused by something else other
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268 // then hitting the guard page or unmapped memory, like, for example,
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269 // unaligned memory access.
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270 auto si = static_cast<const siginfo_t *>(siginfo);
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271 return IsStackAccess &&
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272 (si->si_code == si_SEGV_MAPERR || si->si_code == si_SEGV_ACCERR);
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273 }
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274
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275 #endif // SANITIZER_GO
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276
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277 bool IsAccessibleMemoryRange(uptr beg, uptr size) {
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278 uptr page_size = GetPageSizeCached();
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279 // Checking too large memory ranges is slow.
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280 CHECK_LT(size, page_size * 10);
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281 int sock_pair[2];
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282 if (pipe(sock_pair))
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283 return false;
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284 uptr bytes_written =
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285 internal_write(sock_pair[1], reinterpret_cast<void *>(beg), size);
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286 int write_errno;
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287 bool result;
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288 if (internal_iserror(bytes_written, &write_errno)) {
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289 CHECK_EQ(EFAULT, write_errno);
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290 result = false;
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291 } else {
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292 result = (bytes_written == size);
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293 }
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294 internal_close(sock_pair[0]);
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295 internal_close(sock_pair[1]);
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296 return result;
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297 }
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298
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299 void PlatformPrepareForSandboxing(__sanitizer_sandbox_arguments *args) {
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300 // Some kinds of sandboxes may forbid filesystem access, so we won't be able
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301 // to read the file mappings from /proc/self/maps. Luckily, neither the
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302 // process will be able to load additional libraries, so it's fine to use the
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303 // cached mappings.
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304 MemoryMappingLayout::CacheMemoryMappings();
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305 }
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306
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307 static bool MmapFixed(uptr fixed_addr, uptr size, int additional_flags,
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308 const char *name) {
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309 size = RoundUpTo(size, GetPageSizeCached());
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310 fixed_addr = RoundDownTo(fixed_addr, GetPageSizeCached());
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311 uptr p =
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312 MmapNamed((void *)fixed_addr, size, PROT_READ | PROT_WRITE,
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313 MAP_PRIVATE | MAP_FIXED | additional_flags | MAP_ANON, name);
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314 int reserrno;
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315 if (internal_iserror(p, &reserrno)) {
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316 Report("ERROR: %s failed to "
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317 "allocate 0x%zx (%zd) bytes at address %zx (errno: %d)\n",
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318 SanitizerToolName, size, size, fixed_addr, reserrno);
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319 return false;
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320 }
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321 IncreaseTotalMmap(size);
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322 return true;
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323 }
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324
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325 bool MmapFixedNoReserve(uptr fixed_addr, uptr size, const char *name) {
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326 return MmapFixed(fixed_addr, size, MAP_NORESERVE, name);
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327 }
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328
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329 bool MmapFixedSuperNoReserve(uptr fixed_addr, uptr size, const char *name) {
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330 #if SANITIZER_FREEBSD
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331 if (common_flags()->no_huge_pages_for_shadow)
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332 return MmapFixedNoReserve(fixed_addr, size, name);
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333 // MAP_NORESERVE is implicit with FreeBSD
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334 return MmapFixed(fixed_addr, size, MAP_ALIGNED_SUPER, name);
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335 #else
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336 bool r = MmapFixedNoReserve(fixed_addr, size, name);
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337 if (r)
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338 SetShadowRegionHugePageMode(fixed_addr, size);
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339 return r;
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340 #endif
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341 }
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342
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343 uptr ReservedAddressRange::Init(uptr size, const char *name, uptr fixed_addr) {
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344 base_ = fixed_addr ? MmapFixedNoAccess(fixed_addr, size, name)
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345 : MmapNoAccess(size);
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346 size_ = size;
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347 name_ = name;
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348 (void)os_handle_; // unsupported
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349 return reinterpret_cast<uptr>(base_);
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350 }
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351
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352 // Uses fixed_addr for now.
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353 // Will use offset instead once we've implemented this function for real.
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354 uptr ReservedAddressRange::Map(uptr fixed_addr, uptr size, const char *name) {
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355 return reinterpret_cast<uptr>(
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356 MmapFixedOrDieOnFatalError(fixed_addr, size, name));
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357 }
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358
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359 uptr ReservedAddressRange::MapOrDie(uptr fixed_addr, uptr size,
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360 const char *name) {
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361 return reinterpret_cast<uptr>(MmapFixedOrDie(fixed_addr, size, name));
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362 }
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363
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364 void ReservedAddressRange::Unmap(uptr addr, uptr size) {
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365 CHECK_LE(size, size_);
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366 if (addr == reinterpret_cast<uptr>(base_))
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367 // If we unmap the whole range, just null out the base.
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368 base_ = (size == size_) ? nullptr : reinterpret_cast<void*>(addr + size);
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369 else
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370 CHECK_EQ(addr + size, reinterpret_cast<uptr>(base_) + size_);
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371 size_ -= size;
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372 UnmapOrDie(reinterpret_cast<void*>(addr), size);
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373 }
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374
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375 void *MmapFixedNoAccess(uptr fixed_addr, uptr size, const char *name) {
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376 return (void *)MmapNamed((void *)fixed_addr, size, PROT_NONE,
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377 MAP_PRIVATE | MAP_FIXED | MAP_NORESERVE | MAP_ANON,
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378 name);
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379 }
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380
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381 void *MmapNoAccess(uptr size) {
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382 unsigned flags = MAP_PRIVATE | MAP_ANON | MAP_NORESERVE;
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383 return (void *)internal_mmap(nullptr, size, PROT_NONE, flags, -1, 0);
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384 }
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385
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386 // This function is defined elsewhere if we intercepted pthread_attr_getstack.
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387 extern "C" {
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388 SANITIZER_WEAK_ATTRIBUTE int
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389 real_pthread_attr_getstack(void *attr, void **addr, size_t *size);
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390 } // extern "C"
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391
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392 int my_pthread_attr_getstack(void *attr, void **addr, uptr *size) {
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393 #if !SANITIZER_GO && !SANITIZER_MAC
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394 if (&real_pthread_attr_getstack)
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395 return real_pthread_attr_getstack((pthread_attr_t *)attr, addr,
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396 (size_t *)size);
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397 #endif
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398 return pthread_attr_getstack((pthread_attr_t *)attr, addr, (size_t *)size);
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399 }
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400
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401 #if !SANITIZER_GO
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402 void AdjustStackSize(void *attr_) {
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403 pthread_attr_t *attr = (pthread_attr_t *)attr_;
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404 uptr stackaddr = 0;
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405 uptr stacksize = 0;
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406 my_pthread_attr_getstack(attr, (void**)&stackaddr, &stacksize);
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407 // GLibC will return (0 - stacksize) as the stack address in the case when
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408 // stacksize is set, but stackaddr is not.
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409 bool stack_set = (stackaddr != 0) && (stackaddr + stacksize != 0);
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410 // We place a lot of tool data into TLS, account for that.
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411 const uptr minstacksize = GetTlsSize() + 128*1024;
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412 if (stacksize < minstacksize) {
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413 if (!stack_set) {
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414 if (stacksize != 0) {
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415 VPrintf(1, "Sanitizer: increasing stacksize %zu->%zu\n", stacksize,
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416 minstacksize);
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417 pthread_attr_setstacksize(attr, minstacksize);
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418 }
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419 } else {
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420 Printf("Sanitizer: pre-allocated stack size is insufficient: "
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421 "%zu < %zu\n", stacksize, minstacksize);
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422 Printf("Sanitizer: pthread_create is likely to fail.\n");
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423 }
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424 }
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425 }
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426 #endif // !SANITIZER_GO
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427
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428 pid_t StartSubprocess(const char *program, const char *const argv[],
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429 fd_t stdin_fd, fd_t stdout_fd, fd_t stderr_fd) {
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430 auto file_closer = at_scope_exit([&] {
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431 if (stdin_fd != kInvalidFd) {
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432 internal_close(stdin_fd);
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433 }
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434 if (stdout_fd != kInvalidFd) {
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435 internal_close(stdout_fd);
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436 }
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437 if (stderr_fd != kInvalidFd) {
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438 internal_close(stderr_fd);
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439 }
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440 });
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441
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442 int pid = internal_fork();
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443
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444 if (pid < 0) {
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|
445 int rverrno;
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446 if (internal_iserror(pid, &rverrno)) {
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|
|
447 Report("WARNING: failed to fork (errno %d)\n", rverrno);
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|
|
448 }
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|
|
449 return pid;
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|
|
450 }
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|
|
451
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|
|
452 if (pid == 0) {
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|
|
453 // Child subprocess
|
|
|
454 if (stdin_fd != kInvalidFd) {
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|
|
455 internal_close(STDIN_FILENO);
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|
|
456 internal_dup2(stdin_fd, STDIN_FILENO);
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|
|
457 internal_close(stdin_fd);
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|
|
458 }
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|
|
459 if (stdout_fd != kInvalidFd) {
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|
|
460 internal_close(STDOUT_FILENO);
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|
|
461 internal_dup2(stdout_fd, STDOUT_FILENO);
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|
|
462 internal_close(stdout_fd);
|
|
|
463 }
|
|
|
464 if (stderr_fd != kInvalidFd) {
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|
|
465 internal_close(STDERR_FILENO);
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|
|
466 internal_dup2(stderr_fd, STDERR_FILENO);
|
|
|
467 internal_close(stderr_fd);
|
|
|
468 }
|
|
|
469
|
|
|
470 for (int fd = sysconf(_SC_OPEN_MAX); fd > 2; fd--) internal_close(fd);
|
|
|
471
|
|
|
472 execv(program, const_cast<char **>(&argv[0]));
|
|
|
473 internal__exit(1);
|
|
|
474 }
|
|
|
475
|
|
|
476 return pid;
|
|
|
477 }
|
|
|
478
|
|
|
479 bool IsProcessRunning(pid_t pid) {
|
|
|
480 int process_status;
|
|
|
481 uptr waitpid_status = internal_waitpid(pid, &process_status, WNOHANG);
|
|
|
482 int local_errno;
|
|
|
483 if (internal_iserror(waitpid_status, &local_errno)) {
|
|
|
484 VReport(1, "Waiting on the process failed (errno %d).\n", local_errno);
|
|
|
485 return false;
|
|
|
486 }
|
|
|
487 return waitpid_status == 0;
|
|
|
488 }
|
|
|
489
|
|
|
490 int WaitForProcess(pid_t pid) {
|
|
|
491 int process_status;
|
|
|
492 uptr waitpid_status = internal_waitpid(pid, &process_status, 0);
|
|
|
493 int local_errno;
|
|
|
494 if (internal_iserror(waitpid_status, &local_errno)) {
|
|
|
495 VReport(1, "Waiting on the process failed (errno %d).\n", local_errno);
|
|
|
496 return -1;
|
|
|
497 }
|
|
|
498 return process_status;
|
|
|
499 }
|
|
|
500
|
|
|
501 bool IsStateDetached(int state) {
|
|
|
502 return state == PTHREAD_CREATE_DETACHED;
|
|
|
503 }
|
|
|
504
|
|
|
505 } // namespace __sanitizer
|
|
|
506
|
|
|
507 #endif // SANITIZER_POSIX
|
