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145
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1 //===-- sanitizer_linux.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 linux-specific functions from
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11 // 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_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \
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17 SANITIZER_OPENBSD || SANITIZER_SOLARIS
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18
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19 #include "sanitizer_common.h"
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20 #include "sanitizer_flags.h"
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21 #include "sanitizer_getauxval.h"
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22 #include "sanitizer_internal_defs.h"
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23 #include "sanitizer_libc.h"
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24 #include "sanitizer_linux.h"
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25 #include "sanitizer_mutex.h"
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26 #include "sanitizer_placement_new.h"
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27 #include "sanitizer_procmaps.h"
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28
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29 #if SANITIZER_LINUX
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30 #include <asm/param.h>
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31 #endif
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32
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33 // For mips64, syscall(__NR_stat) fills the buffer in the 'struct kernel_stat'
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34 // format. Struct kernel_stat is defined as 'struct stat' in asm/stat.h. To
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35 // access stat from asm/stat.h, without conflicting with definition in
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36 // sys/stat.h, we use this trick.
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37 #if defined(__mips64)
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38 #include <asm/unistd.h>
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39 #include <sys/types.h>
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40 #define stat kernel_stat
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41 #include <asm/stat.h>
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42 #undef stat
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43 #endif
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44
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45 #include <dlfcn.h>
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46 #include <errno.h>
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47 #include <fcntl.h>
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48 #include <link.h>
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49 #include <pthread.h>
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50 #include <sched.h>
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51 #include <signal.h>
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52 #include <sys/mman.h>
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53 #include <sys/param.h>
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54 #if !SANITIZER_SOLARIS
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55 #include <sys/ptrace.h>
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56 #endif
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57 #include <sys/resource.h>
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58 #include <sys/stat.h>
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59 #include <sys/syscall.h>
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60 #include <sys/time.h>
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61 #include <sys/types.h>
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62 #if !SANITIZER_OPENBSD
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63 #include <ucontext.h>
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64 #endif
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65 #if SANITIZER_OPENBSD
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66 #include <sys/futex.h>
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67 #include <sys/sysctl.h>
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68 #endif
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69 #include <unistd.h>
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70
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71 #if SANITIZER_LINUX
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72 #include <sys/utsname.h>
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73 #endif
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74
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75 #if SANITIZER_LINUX && !SANITIZER_ANDROID
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76 #include <sys/personality.h>
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77 #endif
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78
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79 #if SANITIZER_FREEBSD
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80 #include <sys/exec.h>
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81 #include <sys/sysctl.h>
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82 #include <machine/atomic.h>
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83 extern "C" {
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84 // <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on
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85 // FreeBSD 9.2 and 10.0.
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86 #include <sys/umtx.h>
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87 }
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88 #include <sys/thr.h>
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89 #endif // SANITIZER_FREEBSD
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90
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91 #if SANITIZER_NETBSD
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92 #include <limits.h> // For NAME_MAX
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93 #include <sys/sysctl.h>
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94 #include <sys/exec.h>
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95 extern struct ps_strings *__ps_strings;
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96 #endif // SANITIZER_NETBSD
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97
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98 #if SANITIZER_SOLARIS
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99 #include <stdlib.h>
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100 #include <thread.h>
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101 #define environ _environ
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102 #endif
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103
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104 extern char **environ;
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105
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106 #if SANITIZER_LINUX
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107 // <linux/time.h>
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108 struct kernel_timeval {
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109 long tv_sec;
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110 long tv_usec;
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111 };
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112
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113 // <linux/futex.h> is broken on some linux distributions.
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114 const int FUTEX_WAIT = 0;
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115 const int FUTEX_WAKE = 1;
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116 const int FUTEX_PRIVATE_FLAG = 128;
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117 const int FUTEX_WAIT_PRIVATE = FUTEX_WAIT | FUTEX_PRIVATE_FLAG;
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118 const int FUTEX_WAKE_PRIVATE = FUTEX_WAKE | FUTEX_PRIVATE_FLAG;
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119 #endif // SANITIZER_LINUX
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120
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121 // Are we using 32-bit or 64-bit Linux syscalls?
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122 // x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32
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123 // but it still needs to use 64-bit syscalls.
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124 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__powerpc64__) || \
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125 SANITIZER_WORDSIZE == 64)
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126 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1
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127 #else
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128 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0
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129 #endif
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130
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131 // Note : FreeBSD had implemented both
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132 // Linux and OpenBSD apis, available from
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133 // future 12.x version most likely
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134 #if SANITIZER_LINUX && defined(__NR_getrandom)
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135 # if !defined(GRND_NONBLOCK)
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136 # define GRND_NONBLOCK 1
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137 # endif
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138 # define SANITIZER_USE_GETRANDOM 1
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139 #else
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140 # define SANITIZER_USE_GETRANDOM 0
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141 #endif // SANITIZER_LINUX && defined(__NR_getrandom)
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142
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143 #if SANITIZER_OPENBSD
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144 # define SANITIZER_USE_GETENTROPY 1
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145 #else
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146 # if SANITIZER_FREEBSD && __FreeBSD_version >= 1200000
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147 # define SANITIZER_USE_GETENTROPY 1
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148 # else
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149 # define SANITIZER_USE_GETENTROPY 0
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150 # endif
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151 #endif // SANITIZER_USE_GETENTROPY
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152
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153 namespace __sanitizer {
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154
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155 #if SANITIZER_LINUX && defined(__x86_64__)
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156 #include "sanitizer_syscall_linux_x86_64.inc"
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157 #elif SANITIZER_LINUX && defined(__aarch64__)
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158 #include "sanitizer_syscall_linux_aarch64.inc"
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159 #elif SANITIZER_LINUX && defined(__arm__)
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160 #include "sanitizer_syscall_linux_arm.inc"
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161 #else
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162 #include "sanitizer_syscall_generic.inc"
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163 #endif
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164
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165 // --------------- sanitizer_libc.h
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166 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD
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167 #if !SANITIZER_S390 && !SANITIZER_OPENBSD
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168 uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd,
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169 OFF_T offset) {
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170 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS
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171 return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd,
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172 offset);
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173 #else
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174 // mmap2 specifies file offset in 4096-byte units.
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175 CHECK(IsAligned(offset, 4096));
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176 return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd,
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177 offset / 4096);
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178 #endif
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179 }
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180 #endif // !SANITIZER_S390 && !SANITIZER_OPENBSD
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181
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182 #if !SANITIZER_OPENBSD
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183 uptr internal_munmap(void *addr, uptr length) {
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184 return internal_syscall(SYSCALL(munmap), (uptr)addr, length);
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185 }
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186
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187 int internal_mprotect(void *addr, uptr length, int prot) {
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188 return internal_syscall(SYSCALL(mprotect), (uptr)addr, length, prot);
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189 }
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190 #endif
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191
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192 uptr internal_close(fd_t fd) {
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193 return internal_syscall(SYSCALL(close), fd);
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194 }
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195
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196 uptr internal_open(const char *filename, int flags) {
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197 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
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198 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags);
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199 #else
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200 return internal_syscall(SYSCALL(open), (uptr)filename, flags);
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201 #endif
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202 }
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203
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204 uptr internal_open(const char *filename, int flags, u32 mode) {
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205 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
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206 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags,
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207 mode);
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208 #else
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209 return internal_syscall(SYSCALL(open), (uptr)filename, flags, mode);
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210 #endif
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211 }
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212
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213 uptr internal_read(fd_t fd, void *buf, uptr count) {
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214 sptr res;
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215 HANDLE_EINTR(res,
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216 (sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf, count));
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217 return res;
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218 }
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219
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220 uptr internal_write(fd_t fd, const void *buf, uptr count) {
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221 sptr res;
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222 HANDLE_EINTR(res,
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223 (sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf, count));
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224 return res;
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225 }
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226
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227 uptr internal_ftruncate(fd_t fd, uptr size) {
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228 sptr res;
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229 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(ftruncate), fd,
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230 (OFF_T)size));
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231 return res;
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232 }
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233
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234 #if !SANITIZER_LINUX_USES_64BIT_SYSCALLS && SANITIZER_LINUX
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235 static void stat64_to_stat(struct stat64 *in, struct stat *out) {
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236 internal_memset(out, 0, sizeof(*out));
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237 out->st_dev = in->st_dev;
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238 out->st_ino = in->st_ino;
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239 out->st_mode = in->st_mode;
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240 out->st_nlink = in->st_nlink;
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241 out->st_uid = in->st_uid;
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242 out->st_gid = in->st_gid;
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243 out->st_rdev = in->st_rdev;
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244 out->st_size = in->st_size;
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245 out->st_blksize = in->st_blksize;
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246 out->st_blocks = in->st_blocks;
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247 out->st_atime = in->st_atime;
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248 out->st_mtime = in->st_mtime;
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249 out->st_ctime = in->st_ctime;
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250 }
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251 #endif
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252
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253 #if defined(__mips64)
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254 // Undefine compatibility macros from <sys/stat.h>
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255 // so that they would not clash with the kernel_stat
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256 // st_[a|m|c]time fields
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257 #undef st_atime
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258 #undef st_mtime
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259 #undef st_ctime
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260 #if defined(SANITIZER_ANDROID)
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261 // Bionic sys/stat.h defines additional macros
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262 // for compatibility with the old NDKs and
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263 // they clash with the kernel_stat structure
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264 // st_[a|m|c]time_nsec fields.
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265 #undef st_atime_nsec
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266 #undef st_mtime_nsec
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267 #undef st_ctime_nsec
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268 #endif
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269 static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) {
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270 internal_memset(out, 0, sizeof(*out));
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271 out->st_dev = in->st_dev;
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272 out->st_ino = in->st_ino;
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273 out->st_mode = in->st_mode;
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274 out->st_nlink = in->st_nlink;
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275 out->st_uid = in->st_uid;
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276 out->st_gid = in->st_gid;
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277 out->st_rdev = in->st_rdev;
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278 out->st_size = in->st_size;
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279 out->st_blksize = in->st_blksize;
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280 out->st_blocks = in->st_blocks;
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281 #if defined(__USE_MISC) || \
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282 defined(__USE_XOPEN2K8) || \
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283 defined(SANITIZER_ANDROID)
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284 out->st_atim.tv_sec = in->st_atime;
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285 out->st_atim.tv_nsec = in->st_atime_nsec;
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286 out->st_mtim.tv_sec = in->st_mtime;
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287 out->st_mtim.tv_nsec = in->st_mtime_nsec;
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288 out->st_ctim.tv_sec = in->st_ctime;
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289 out->st_ctim.tv_nsec = in->st_ctime_nsec;
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290 #else
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291 out->st_atime = in->st_atime;
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292 out->st_atimensec = in->st_atime_nsec;
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293 out->st_mtime = in->st_mtime;
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294 out->st_mtimensec = in->st_mtime_nsec;
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295 out->st_ctime = in->st_ctime;
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296 out->st_atimensec = in->st_ctime_nsec;
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297 #endif
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298 }
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299 #endif
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300
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301 uptr internal_stat(const char *path, void *buf) {
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302 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD
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303 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 0);
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304 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
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305 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf,
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306 0);
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307 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS
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308 # if defined(__mips64)
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309 // For mips64, stat syscall fills buffer in the format of kernel_stat
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310 struct kernel_stat kbuf;
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311 int res = internal_syscall(SYSCALL(stat), path, &kbuf);
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312 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
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313 return res;
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314 # else
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315 return internal_syscall(SYSCALL(stat), (uptr)path, (uptr)buf);
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316 # endif
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317 #else
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318 struct stat64 buf64;
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319 int res = internal_syscall(SYSCALL(stat64), path, &buf64);
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320 stat64_to_stat(&buf64, (struct stat *)buf);
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321 return res;
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322 #endif
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323 }
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324
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325 uptr internal_lstat(const char *path, void *buf) {
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326 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD
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327 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf,
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328 AT_SYMLINK_NOFOLLOW);
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329 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
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330 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf,
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331 AT_SYMLINK_NOFOLLOW);
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332 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS
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333 # if SANITIZER_MIPS64
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334 // For mips64, lstat syscall fills buffer in the format of kernel_stat
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335 struct kernel_stat kbuf;
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336 int res = internal_syscall(SYSCALL(lstat), path, &kbuf);
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337 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
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338 return res;
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339 # else
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340 return internal_syscall(SYSCALL(lstat), (uptr)path, (uptr)buf);
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341 # endif
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342 #else
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343 struct stat64 buf64;
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344 int res = internal_syscall(SYSCALL(lstat64), path, &buf64);
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345 stat64_to_stat(&buf64, (struct stat *)buf);
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346 return res;
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347 #endif
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348 }
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349
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350 uptr internal_fstat(fd_t fd, void *buf) {
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351 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD || \
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352 SANITIZER_LINUX_USES_64BIT_SYSCALLS
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353 #if SANITIZER_MIPS64 && !SANITIZER_OPENBSD
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354 // For mips64, fstat syscall fills buffer in the format of kernel_stat
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355 struct kernel_stat kbuf;
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356 int res = internal_syscall(SYSCALL(fstat), fd, &kbuf);
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357 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
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358 return res;
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359 # else
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360 return internal_syscall(SYSCALL(fstat), fd, (uptr)buf);
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361 # endif
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362 #else
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363 struct stat64 buf64;
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364 int res = internal_syscall(SYSCALL(fstat64), fd, &buf64);
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365 stat64_to_stat(&buf64, (struct stat *)buf);
|
|
|
366 return res;
|
|
|
367 #endif
|
|
|
368 }
|
|
|
369
|
|
|
370 uptr internal_filesize(fd_t fd) {
|
|
|
371 struct stat st;
|
|
|
372 if (internal_fstat(fd, &st))
|
|
|
373 return -1;
|
|
|
374 return (uptr)st.st_size;
|
|
|
375 }
|
|
|
376
|
|
|
377 uptr internal_dup(int oldfd) {
|
|
|
378 return internal_syscall(SYSCALL(dup), oldfd);
|
|
|
379 }
|
|
|
380
|
|
|
381 uptr internal_dup2(int oldfd, int newfd) {
|
|
|
382 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
|
|
|
383 return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0);
|
|
|
384 #else
|
|
|
385 return internal_syscall(SYSCALL(dup2), oldfd, newfd);
|
|
|
386 #endif
|
|
|
387 }
|
|
|
388
|
|
|
389 uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
|
|
|
390 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
|
|
|
391 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf,
|
|
|
392 bufsize);
|
|
|
393 #elif SANITIZER_OPENBSD
|
|
|
394 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf,
|
|
|
395 bufsize);
|
|
|
396 #else
|
|
|
397 return internal_syscall(SYSCALL(readlink), (uptr)path, (uptr)buf, bufsize);
|
|
|
398 #endif
|
|
|
399 }
|
|
|
400
|
|
|
401 uptr internal_unlink(const char *path) {
|
|
|
402 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS || SANITIZER_OPENBSD
|
|
|
403 return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0);
|
|
|
404 #else
|
|
|
405 return internal_syscall(SYSCALL(unlink), (uptr)path);
|
|
|
406 #endif
|
|
|
407 }
|
|
|
408
|
|
|
409 uptr internal_rename(const char *oldpath, const char *newpath) {
|
|
|
410 #if defined(__riscv)
|
|
|
411 return internal_syscall(SYSCALL(renameat2), AT_FDCWD, (uptr)oldpath, AT_FDCWD,
|
|
|
412 (uptr)newpath, 0);
|
|
|
413 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS || SANITIZER_OPENBSD
|
|
|
414 return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD,
|
|
|
415 (uptr)newpath);
|
|
|
416 #else
|
|
|
417 return internal_syscall(SYSCALL(rename), (uptr)oldpath, (uptr)newpath);
|
|
|
418 #endif
|
|
|
419 }
|
|
|
420
|
|
|
421 uptr internal_sched_yield() {
|
|
|
422 return internal_syscall(SYSCALL(sched_yield));
|
|
|
423 }
|
|
|
424
|
|
|
425 void internal__exit(int exitcode) {
|
|
|
426 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD
|
|
|
427 internal_syscall(SYSCALL(exit), exitcode);
|
|
|
428 #else
|
|
|
429 internal_syscall(SYSCALL(exit_group), exitcode);
|
|
|
430 #endif
|
|
|
431 Die(); // Unreachable.
|
|
|
432 }
|
|
|
433
|
|
|
434 unsigned int internal_sleep(unsigned int seconds) {
|
|
|
435 struct timespec ts;
|
|
|
436 ts.tv_sec = seconds;
|
|
|
437 ts.tv_nsec = 0;
|
|
|
438 int res = internal_syscall(SYSCALL(nanosleep), &ts, &ts);
|
|
|
439 if (res) return ts.tv_sec;
|
|
|
440 return 0;
|
|
|
441 }
|
|
|
442
|
|
|
443 uptr internal_execve(const char *filename, char *const argv[],
|
|
|
444 char *const envp[]) {
|
|
|
445 return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv,
|
|
|
446 (uptr)envp);
|
|
|
447 }
|
|
|
448 #endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD
|
|
|
449
|
|
|
450 // ----------------- sanitizer_common.h
|
|
|
451 bool FileExists(const char *filename) {
|
|
|
452 if (ShouldMockFailureToOpen(filename))
|
|
|
453 return false;
|
|
|
454 struct stat st;
|
|
|
455 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
|
|
|
456 if (internal_syscall(SYSCALL(newfstatat), AT_FDCWD, filename, &st, 0))
|
|
|
457 #else
|
|
|
458 if (internal_stat(filename, &st))
|
|
|
459 #endif
|
|
|
460 return false;
|
|
|
461 // Sanity check: filename is a regular file.
|
|
|
462 return S_ISREG(st.st_mode);
|
|
|
463 }
|
|
|
464
|
|
|
465 #if !SANITIZER_NETBSD
|
|
|
466 tid_t GetTid() {
|
|
|
467 #if SANITIZER_FREEBSD
|
|
|
468 long Tid;
|
|
|
469 thr_self(&Tid);
|
|
|
470 return Tid;
|
|
|
471 #elif SANITIZER_OPENBSD
|
|
|
472 return internal_syscall(SYSCALL(getthrid));
|
|
|
473 #elif SANITIZER_SOLARIS
|
|
|
474 return thr_self();
|
|
|
475 #else
|
|
|
476 return internal_syscall(SYSCALL(gettid));
|
|
|
477 #endif
|
|
|
478 }
|
|
|
479
|
|
|
480 int TgKill(pid_t pid, tid_t tid, int sig) {
|
|
|
481 #if SANITIZER_LINUX
|
|
|
482 return internal_syscall(SYSCALL(tgkill), pid, tid, sig);
|
|
|
483 #elif SANITIZER_FREEBSD
|
|
|
484 return internal_syscall(SYSCALL(thr_kill2), pid, tid, sig);
|
|
|
485 #elif SANITIZER_OPENBSD
|
|
|
486 (void)pid;
|
|
|
487 return internal_syscall(SYSCALL(thrkill), tid, sig, nullptr);
|
|
|
488 #elif SANITIZER_SOLARIS
|
|
|
489 (void)pid;
|
|
|
490 return thr_kill(tid, sig);
|
|
|
491 #endif
|
|
|
492 }
|
|
|
493 #endif
|
|
|
494
|
|
|
495 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD
|
|
|
496 u64 NanoTime() {
|
|
|
497 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD
|
|
|
498 timeval tv;
|
|
|
499 #else
|
|
|
500 kernel_timeval tv;
|
|
|
501 #endif
|
|
|
502 internal_memset(&tv, 0, sizeof(tv));
|
|
|
503 internal_syscall(SYSCALL(gettimeofday), &tv, 0);
|
|
|
504 return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000;
|
|
|
505 }
|
|
|
506
|
|
|
507 uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp) {
|
|
|
508 return internal_syscall(SYSCALL(clock_gettime), clk_id, tp);
|
|
|
509 }
|
|
|
510 #endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD
|
|
|
511
|
|
|
512 // Like getenv, but reads env directly from /proc (on Linux) or parses the
|
|
|
513 // 'environ' array (on some others) and does not use libc. This function
|
|
|
514 // should be called first inside __asan_init.
|
|
|
515 const char *GetEnv(const char *name) {
|
|
|
516 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_OPENBSD || \
|
|
|
517 SANITIZER_SOLARIS
|
|
|
518 if (::environ != 0) {
|
|
|
519 uptr NameLen = internal_strlen(name);
|
|
|
520 for (char **Env = ::environ; *Env != 0; Env++) {
|
|
|
521 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=')
|
|
|
522 return (*Env) + NameLen + 1;
|
|
|
523 }
|
|
|
524 }
|
|
|
525 return 0; // Not found.
|
|
|
526 #elif SANITIZER_LINUX
|
|
|
527 static char *environ;
|
|
|
528 static uptr len;
|
|
|
529 static bool inited;
|
|
|
530 if (!inited) {
|
|
|
531 inited = true;
|
|
|
532 uptr environ_size;
|
|
|
533 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len))
|
|
|
534 environ = nullptr;
|
|
|
535 }
|
|
|
536 if (!environ || len == 0) return nullptr;
|
|
|
537 uptr namelen = internal_strlen(name);
|
|
|
538 const char *p = environ;
|
|
|
539 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer
|
|
|
540 // proc file has the format NAME=value\0NAME=value\0NAME=value\0...
|
|
|
541 const char* endp =
|
|
|
542 (char*)internal_memchr(p, '\0', len - (p - environ));
|
|
|
543 if (!endp) // this entry isn't NUL terminated
|
|
|
544 return nullptr;
|
|
|
545 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match.
|
|
|
546 return p + namelen + 1; // point after =
|
|
|
547 p = endp + 1;
|
|
|
548 }
|
|
|
549 return nullptr; // Not found.
|
|
|
550 #else
|
|
|
551 #error "Unsupported platform"
|
|
|
552 #endif
|
|
|
553 }
|
|
|
554
|
|
|
555 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD && !SANITIZER_OPENBSD
|
|
|
556 extern "C" {
|
|
|
557 SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end;
|
|
|
558 }
|
|
|
559 #endif
|
|
|
560
|
|
|
561 #if !SANITIZER_GO && !SANITIZER_FREEBSD && !SANITIZER_NETBSD && \
|
|
|
562 !SANITIZER_OPENBSD
|
|
|
563 static void ReadNullSepFileToArray(const char *path, char ***arr,
|
|
|
564 int arr_size) {
|
|
|
565 char *buff;
|
|
|
566 uptr buff_size;
|
|
|
567 uptr buff_len;
|
|
|
568 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray");
|
|
|
569 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) {
|
|
|
570 (*arr)[0] = nullptr;
|
|
|
571 return;
|
|
|
572 }
|
|
|
573 (*arr)[0] = buff;
|
|
|
574 int count, i;
|
|
|
575 for (count = 1, i = 1; ; i++) {
|
|
|
576 if (buff[i] == 0) {
|
|
|
577 if (buff[i+1] == 0) break;
|
|
|
578 (*arr)[count] = &buff[i+1];
|
|
|
579 CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible.
|
|
|
580 count++;
|
|
|
581 }
|
|
|
582 }
|
|
|
583 (*arr)[count] = nullptr;
|
|
|
584 }
|
|
|
585 #endif
|
|
|
586
|
|
|
587 #if !SANITIZER_OPENBSD
|
|
|
588 static void GetArgsAndEnv(char ***argv, char ***envp) {
|
|
|
589 #if SANITIZER_FREEBSD
|
|
|
590 // On FreeBSD, retrieving the argument and environment arrays is done via the
|
|
|
591 // kern.ps_strings sysctl, which returns a pointer to a structure containing
|
|
|
592 // this information. See also <sys/exec.h>.
|
|
|
593 ps_strings *pss;
|
|
|
594 uptr sz = sizeof(pss);
|
|
|
595 if (internal_sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) {
|
|
|
596 Printf("sysctl kern.ps_strings failed\n");
|
|
|
597 Die();
|
|
|
598 }
|
|
|
599 *argv = pss->ps_argvstr;
|
|
|
600 *envp = pss->ps_envstr;
|
|
|
601 #elif SANITIZER_NETBSD
|
|
|
602 *argv = __ps_strings->ps_argvstr;
|
|
|
603 *envp = __ps_strings->ps_envstr;
|
|
|
604 #else // SANITIZER_FREEBSD
|
|
|
605 #if !SANITIZER_GO
|
|
|
606 if (&__libc_stack_end) {
|
|
|
607 #endif // !SANITIZER_GO
|
|
|
608 uptr* stack_end = (uptr*)__libc_stack_end;
|
|
|
609 int argc = *stack_end;
|
|
|
610 *argv = (char**)(stack_end + 1);
|
|
|
611 *envp = (char**)(stack_end + argc + 2);
|
|
|
612 #if !SANITIZER_GO
|
|
|
613 } else {
|
|
|
614 static const int kMaxArgv = 2000, kMaxEnvp = 2000;
|
|
|
615 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv);
|
|
|
616 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp);
|
|
|
617 }
|
|
|
618 #endif // !SANITIZER_GO
|
|
|
619 #endif // SANITIZER_FREEBSD
|
|
|
620 }
|
|
|
621
|
|
|
622 char **GetArgv() {
|
|
|
623 char **argv, **envp;
|
|
|
624 GetArgsAndEnv(&argv, &envp);
|
|
|
625 return argv;
|
|
|
626 }
|
|
|
627
|
|
|
628 char **GetEnviron() {
|
|
|
629 char **argv, **envp;
|
|
|
630 GetArgsAndEnv(&argv, &envp);
|
|
|
631 return envp;
|
|
|
632 }
|
|
|
633
|
|
|
634 #endif // !SANITIZER_OPENBSD
|
|
|
635
|
|
|
636 #if !SANITIZER_SOLARIS
|
|
|
637 enum MutexState {
|
|
|
638 MtxUnlocked = 0,
|
|
|
639 MtxLocked = 1,
|
|
|
640 MtxSleeping = 2
|
|
|
641 };
|
|
|
642
|
|
|
643 BlockingMutex::BlockingMutex() {
|
|
|
644 internal_memset(this, 0, sizeof(*this));
|
|
|
645 }
|
|
|
646
|
|
|
647 void BlockingMutex::Lock() {
|
|
|
648 CHECK_EQ(owner_, 0);
|
|
|
649 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
|
|
|
650 if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked)
|
|
|
651 return;
|
|
|
652 while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) {
|
|
|
653 #if SANITIZER_FREEBSD
|
|
|
654 _umtx_op(m, UMTX_OP_WAIT_UINT, MtxSleeping, 0, 0);
|
|
|
655 #elif SANITIZER_NETBSD
|
|
|
656 sched_yield(); /* No userspace futex-like synchronization */
|
|
|
657 #else
|
|
|
658 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAIT_PRIVATE, MtxSleeping,
|
|
|
659 0, 0, 0);
|
|
|
660 #endif
|
|
|
661 }
|
|
|
662 }
|
|
|
663
|
|
|
664 void BlockingMutex::Unlock() {
|
|
|
665 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
|
|
|
666 u32 v = atomic_exchange(m, MtxUnlocked, memory_order_release);
|
|
|
667 CHECK_NE(v, MtxUnlocked);
|
|
|
668 if (v == MtxSleeping) {
|
|
|
669 #if SANITIZER_FREEBSD
|
|
|
670 _umtx_op(m, UMTX_OP_WAKE, 1, 0, 0);
|
|
|
671 #elif SANITIZER_NETBSD
|
|
|
672 /* No userspace futex-like synchronization */
|
|
|
673 #else
|
|
|
674 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAKE_PRIVATE, 1, 0, 0, 0);
|
|
|
675 #endif
|
|
|
676 }
|
|
|
677 }
|
|
|
678
|
|
|
679 void BlockingMutex::CheckLocked() {
|
|
|
680 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
|
|
|
681 CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed));
|
|
|
682 }
|
|
|
683 #endif // !SANITIZER_SOLARIS
|
|
|
684
|
|
|
685 // ----------------- sanitizer_linux.h
|
|
|
686 // The actual size of this structure is specified by d_reclen.
|
|
|
687 // Note that getdents64 uses a different structure format. We only provide the
|
|
|
688 // 32-bit syscall here.
|
|
|
689 #if SANITIZER_NETBSD
|
|
|
690 // Not used
|
|
|
691 #elif SANITIZER_OPENBSD
|
|
|
692 // struct dirent is different for Linux and us. At this moment, we use only
|
|
|
693 // d_fileno (Linux call this d_ino), d_reclen, and d_name.
|
|
|
694 struct linux_dirent {
|
|
|
695 u64 d_ino; // d_fileno
|
|
|
696 u16 d_reclen;
|
|
|
697 u16 d_namlen; // not used
|
|
|
698 u8 d_type; // not used
|
|
|
699 char d_name[NAME_MAX + 1];
|
|
|
700 };
|
|
|
701 #else
|
|
|
702 struct linux_dirent {
|
|
|
703 #if SANITIZER_X32 || defined(__aarch64__)
|
|
|
704 u64 d_ino;
|
|
|
705 u64 d_off;
|
|
|
706 #else
|
|
|
707 unsigned long d_ino;
|
|
|
708 unsigned long d_off;
|
|
|
709 #endif
|
|
|
710 unsigned short d_reclen;
|
|
|
711 #ifdef __aarch64__
|
|
|
712 unsigned char d_type;
|
|
|
713 #endif
|
|
|
714 char d_name[256];
|
|
|
715 };
|
|
|
716 #endif
|
|
|
717
|
|
|
718 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD
|
|
|
719 // Syscall wrappers.
|
|
|
720 uptr internal_ptrace(int request, int pid, void *addr, void *data) {
|
|
|
721 return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr,
|
|
|
722 (uptr)data);
|
|
|
723 }
|
|
|
724
|
|
|
725 uptr internal_waitpid(int pid, int *status, int options) {
|
|
|
726 return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options,
|
|
|
727 0 /* rusage */);
|
|
|
728 }
|
|
|
729
|
|
|
730 uptr internal_getpid() {
|
|
|
731 return internal_syscall(SYSCALL(getpid));
|
|
|
732 }
|
|
|
733
|
|
|
734 uptr internal_getppid() {
|
|
|
735 return internal_syscall(SYSCALL(getppid));
|
|
|
736 }
|
|
|
737
|
|
|
738 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) {
|
|
|
739 #if SANITIZER_FREEBSD
|
|
|
740 return internal_syscall(SYSCALL(getdirentries), fd, (uptr)dirp, count, NULL);
|
|
|
741 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
|
|
|
742 return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count);
|
|
|
743 #else
|
|
|
744 return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count);
|
|
|
745 #endif
|
|
|
746 }
|
|
|
747
|
|
|
748 uptr internal_lseek(fd_t fd, OFF_T offset, int whence) {
|
|
|
749 return internal_syscall(SYSCALL(lseek), fd, offset, whence);
|
|
|
750 }
|
|
|
751
|
|
|
752 #if SANITIZER_LINUX
|
|
|
753 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) {
|
|
|
754 return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5);
|
|
|
755 }
|
|
|
756 #endif
|
|
|
757
|
|
|
758 uptr internal_sigaltstack(const void *ss, void *oss) {
|
|
|
759 return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss);
|
|
|
760 }
|
|
|
761
|
|
|
762 int internal_fork() {
|
|
|
763 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
|
|
|
764 return internal_syscall(SYSCALL(clone), SIGCHLD, 0);
|
|
|
765 #else
|
|
|
766 return internal_syscall(SYSCALL(fork));
|
|
|
767 #endif
|
|
|
768 }
|
|
|
769
|
|
|
770 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD
|
|
|
771 int internal_sysctl(const int *name, unsigned int namelen, void *oldp,
|
|
|
772 uptr *oldlenp, const void *newp, uptr newlen) {
|
|
|
773 #if SANITIZER_OPENBSD
|
|
|
774 return sysctl(name, namelen, oldp, (size_t *)oldlenp, (void *)newp,
|
|
|
775 (size_t)newlen);
|
|
|
776 #else
|
|
|
777 return internal_syscall(SYSCALL(__sysctl), name, namelen, oldp,
|
|
|
778 (size_t *)oldlenp, newp, (size_t)newlen);
|
|
|
779 #endif
|
|
|
780 }
|
|
|
781
|
|
|
782 #if SANITIZER_FREEBSD
|
|
|
783 int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp,
|
|
|
784 const void *newp, uptr newlen) {
|
|
|
785 static decltype(sysctlbyname) *real = nullptr;
|
|
|
786 if (!real)
|
|
|
787 real = (decltype(sysctlbyname) *)dlsym(RTLD_NEXT, "sysctlbyname");
|
|
|
788 CHECK(real);
|
|
|
789 return real(sname, oldp, (size_t *)oldlenp, newp, (size_t)newlen);
|
|
|
790 }
|
|
|
791 #endif
|
|
|
792 #endif
|
|
|
793
|
|
|
794 #if SANITIZER_LINUX
|
|
|
795 #define SA_RESTORER 0x04000000
|
|
|
796 // Doesn't set sa_restorer if the caller did not set it, so use with caution
|
|
|
797 //(see below).
|
|
|
798 int internal_sigaction_norestorer(int signum, const void *act, void *oldact) {
|
|
|
799 __sanitizer_kernel_sigaction_t k_act, k_oldact;
|
|
|
800 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t));
|
|
|
801 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t));
|
|
|
802 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act;
|
|
|
803 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact;
|
|
|
804 if (u_act) {
|
|
|
805 k_act.handler = u_act->handler;
|
|
|
806 k_act.sigaction = u_act->sigaction;
|
|
|
807 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask,
|
|
|
808 sizeof(__sanitizer_kernel_sigset_t));
|
|
|
809 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL).
|
|
|
810 k_act.sa_flags = u_act->sa_flags | SA_RESTORER;
|
|
|
811 // FIXME: most often sa_restorer is unset, however the kernel requires it
|
|
|
812 // to point to a valid signal restorer that calls the rt_sigreturn syscall.
|
|
|
813 // If sa_restorer passed to the kernel is NULL, the program may crash upon
|
|
|
814 // signal delivery or fail to unwind the stack in the signal handler.
|
|
|
815 // libc implementation of sigaction() passes its own restorer to
|
|
|
816 // rt_sigaction, so we need to do the same (we'll need to reimplement the
|
|
|
817 // restorers; for x86_64 the restorer address can be obtained from
|
|
|
818 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact).
|
|
|
819 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32
|
|
|
820 k_act.sa_restorer = u_act->sa_restorer;
|
|
|
821 #endif
|
|
|
822 }
|
|
|
823
|
|
|
824 uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum,
|
|
|
825 (uptr)(u_act ? &k_act : nullptr),
|
|
|
826 (uptr)(u_oldact ? &k_oldact : nullptr),
|
|
|
827 (uptr)sizeof(__sanitizer_kernel_sigset_t));
|
|
|
828
|
|
|
829 if ((result == 0) && u_oldact) {
|
|
|
830 u_oldact->handler = k_oldact.handler;
|
|
|
831 u_oldact->sigaction = k_oldact.sigaction;
|
|
|
832 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask,
|
|
|
833 sizeof(__sanitizer_kernel_sigset_t));
|
|
|
834 u_oldact->sa_flags = k_oldact.sa_flags;
|
|
|
835 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32
|
|
|
836 u_oldact->sa_restorer = k_oldact.sa_restorer;
|
|
|
837 #endif
|
|
|
838 }
|
|
|
839 return result;
|
|
|
840 }
|
|
|
841 #endif // SANITIZER_LINUX
|
|
|
842
|
|
|
843 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
|
|
|
844 __sanitizer_sigset_t *oldset) {
|
|
|
845 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD
|
|
|
846 return internal_syscall(SYSCALL(sigprocmask), how, set, oldset);
|
|
|
847 #else
|
|
|
848 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
|
|
|
849 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset;
|
|
|
850 return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how,
|
|
|
851 (uptr)&k_set->sig[0], (uptr)&k_oldset->sig[0],
|
|
|
852 sizeof(__sanitizer_kernel_sigset_t));
|
|
|
853 #endif
|
|
|
854 }
|
|
|
855
|
|
|
856 void internal_sigfillset(__sanitizer_sigset_t *set) {
|
|
|
857 internal_memset(set, 0xff, sizeof(*set));
|
|
|
858 }
|
|
|
859
|
|
|
860 void internal_sigemptyset(__sanitizer_sigset_t *set) {
|
|
|
861 internal_memset(set, 0, sizeof(*set));
|
|
|
862 }
|
|
|
863
|
|
|
864 #if SANITIZER_LINUX
|
|
|
865 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) {
|
|
|
866 signum -= 1;
|
|
|
867 CHECK_GE(signum, 0);
|
|
|
868 CHECK_LT(signum, sizeof(*set) * 8);
|
|
|
869 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
|
|
|
870 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
|
|
|
871 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
|
|
|
872 k_set->sig[idx] &= ~(1 << bit);
|
|
|
873 }
|
|
|
874
|
|
|
875 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) {
|
|
|
876 signum -= 1;
|
|
|
877 CHECK_GE(signum, 0);
|
|
|
878 CHECK_LT(signum, sizeof(*set) * 8);
|
|
|
879 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
|
|
|
880 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
|
|
|
881 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
|
|
|
882 return k_set->sig[idx] & (1 << bit);
|
|
|
883 }
|
|
|
884 #elif SANITIZER_FREEBSD
|
|
|
885 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) {
|
|
|
886 sigset_t *rset = reinterpret_cast<sigset_t *>(set);
|
|
|
887 sigdelset(rset, signum);
|
|
|
888 }
|
|
|
889
|
|
|
890 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) {
|
|
|
891 sigset_t *rset = reinterpret_cast<sigset_t *>(set);
|
|
|
892 return sigismember(rset, signum);
|
|
|
893 }
|
|
|
894 #endif
|
|
|
895 #endif // !SANITIZER_SOLARIS
|
|
|
896
|
|
|
897 #if !SANITIZER_NETBSD
|
|
|
898 // ThreadLister implementation.
|
|
|
899 ThreadLister::ThreadLister(pid_t pid) : pid_(pid), buffer_(4096) {
|
|
|
900 char task_directory_path[80];
|
|
|
901 internal_snprintf(task_directory_path, sizeof(task_directory_path),
|
|
|
902 "/proc/%d/task/", pid);
|
|
|
903 descriptor_ = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY);
|
|
|
904 if (internal_iserror(descriptor_)) {
|
|
|
905 Report("Can't open /proc/%d/task for reading.\n", pid);
|
|
|
906 }
|
|
|
907 }
|
|
|
908
|
|
|
909 ThreadLister::Result ThreadLister::ListThreads(
|
|
|
910 InternalMmapVector<tid_t> *threads) {
|
|
|
911 if (internal_iserror(descriptor_))
|
|
|
912 return Error;
|
|
|
913 internal_lseek(descriptor_, 0, SEEK_SET);
|
|
|
914 threads->clear();
|
|
|
915
|
|
|
916 Result result = Ok;
|
|
|
917 for (bool first_read = true;; first_read = false) {
|
|
|
918 // Resize to max capacity if it was downsized by IsAlive.
|
|
|
919 buffer_.resize(buffer_.capacity());
|
|
|
920 CHECK_GE(buffer_.size(), 4096);
|
|
|
921 uptr read = internal_getdents(
|
|
|
922 descriptor_, (struct linux_dirent *)buffer_.data(), buffer_.size());
|
|
|
923 if (!read)
|
|
|
924 return result;
|
|
|
925 if (internal_iserror(read)) {
|
|
|
926 Report("Can't read directory entries from /proc/%d/task.\n", pid_);
|
|
|
927 return Error;
|
|
|
928 }
|
|
|
929
|
|
|
930 for (uptr begin = (uptr)buffer_.data(), end = begin + read; begin < end;) {
|
|
|
931 struct linux_dirent *entry = (struct linux_dirent *)begin;
|
|
|
932 begin += entry->d_reclen;
|
|
|
933 if (entry->d_ino == 1) {
|
|
|
934 // Inode 1 is for bad blocks and also can be a reason for early return.
|
|
|
935 // Should be emitted if kernel tried to output terminating thread.
|
|
|
936 // See proc_task_readdir implementation in Linux.
|
|
|
937 result = Incomplete;
|
|
|
938 }
|
|
|
939 if (entry->d_ino && *entry->d_name >= '0' && *entry->d_name <= '9')
|
|
|
940 threads->push_back(internal_atoll(entry->d_name));
|
|
|
941 }
|
|
|
942
|
|
|
943 // Now we are going to detect short-read or early EOF. In such cases Linux
|
|
|
944 // can return inconsistent list with missing alive threads.
|
|
|
945 // Code will just remember that the list can be incomplete but it will
|
|
|
946 // continue reads to return as much as possible.
|
|
|
947 if (!first_read) {
|
|
|
948 // The first one was a short-read by definition.
|
|
|
949 result = Incomplete;
|
|
|
950 } else if (read > buffer_.size() - 1024) {
|
|
|
951 // Read was close to the buffer size. So double the size and assume the
|
|
|
952 // worst.
|
|
|
953 buffer_.resize(buffer_.size() * 2);
|
|
|
954 result = Incomplete;
|
|
|
955 } else if (!threads->empty() && !IsAlive(threads->back())) {
|
|
|
956 // Maybe Linux early returned from read on terminated thread (!pid_alive)
|
|
|
957 // and failed to restore read position.
|
|
|
958 // See next_tid and proc_task_instantiate in Linux.
|
|
|
959 result = Incomplete;
|
|
|
960 }
|
|
|
961 }
|
|
|
962 }
|
|
|
963
|
|
|
964 bool ThreadLister::IsAlive(int tid) {
|
|
|
965 // /proc/%d/task/%d/status uses same call to detect alive threads as
|
|
|
966 // proc_task_readdir. See task_state implementation in Linux.
|
|
|
967 char path[80];
|
|
|
968 internal_snprintf(path, sizeof(path), "/proc/%d/task/%d/status", pid_, tid);
|
|
|
969 if (!ReadFileToVector(path, &buffer_) || buffer_.empty())
|
|
|
970 return false;
|
|
|
971 buffer_.push_back(0);
|
|
|
972 static const char kPrefix[] = "\nPPid:";
|
|
|
973 const char *field = internal_strstr(buffer_.data(), kPrefix);
|
|
|
974 if (!field)
|
|
|
975 return false;
|
|
|
976 field += internal_strlen(kPrefix);
|
|
|
977 return (int)internal_atoll(field) != 0;
|
|
|
978 }
|
|
|
979
|
|
|
980 ThreadLister::~ThreadLister() {
|
|
|
981 if (!internal_iserror(descriptor_))
|
|
|
982 internal_close(descriptor_);
|
|
|
983 }
|
|
|
984 #endif
|
|
|
985
|
|
|
986 #if SANITIZER_WORDSIZE == 32
|
|
|
987 // Take care of unusable kernel area in top gigabyte.
|
|
|
988 static uptr GetKernelAreaSize() {
|
|
|
989 #if SANITIZER_LINUX && !SANITIZER_X32
|
|
|
990 const uptr gbyte = 1UL << 30;
|
|
|
991
|
|
|
992 // Firstly check if there are writable segments
|
|
|
993 // mapped to top gigabyte (e.g. stack).
|
|
|
994 MemoryMappingLayout proc_maps(/*cache_enabled*/true);
|
|
|
995 if (proc_maps.Error())
|
|
|
996 return 0;
|
|
|
997 MemoryMappedSegment segment;
|
|
|
998 while (proc_maps.Next(&segment)) {
|
|
|
999 if ((segment.end >= 3 * gbyte) && segment.IsWritable()) return 0;
|
|
|
1000 }
|
|
|
1001
|
|
|
1002 #if !SANITIZER_ANDROID
|
|
|
1003 // Even if nothing is mapped, top Gb may still be accessible
|
|
|
1004 // if we are running on 64-bit kernel.
|
|
|
1005 // Uname may report misleading results if personality type
|
|
|
1006 // is modified (e.g. under schroot) so check this as well.
|
|
|
1007 struct utsname uname_info;
|
|
|
1008 int pers = personality(0xffffffffUL);
|
|
|
1009 if (!(pers & PER_MASK)
|
|
|
1010 && uname(&uname_info) == 0
|
|
|
1011 && internal_strstr(uname_info.machine, "64"))
|
|
|
1012 return 0;
|
|
|
1013 #endif // SANITIZER_ANDROID
|
|
|
1014
|
|
|
1015 // Top gigabyte is reserved for kernel.
|
|
|
1016 return gbyte;
|
|
|
1017 #else
|
|
|
1018 return 0;
|
|
|
1019 #endif // SANITIZER_LINUX && !SANITIZER_X32
|
|
|
1020 }
|
|
|
1021 #endif // SANITIZER_WORDSIZE == 32
|
|
|
1022
|
|
|
1023 uptr GetMaxVirtualAddress() {
|
|
|
1024 #if (SANITIZER_NETBSD || SANITIZER_OPENBSD) && defined(__x86_64__)
|
|
|
1025 return 0x7f7ffffff000ULL; // (0x00007f8000000000 - PAGE_SIZE)
|
|
|
1026 #elif SANITIZER_WORDSIZE == 64
|
|
|
1027 # if defined(__powerpc64__) || defined(__aarch64__)
|
|
|
1028 // On PowerPC64 we have two different address space layouts: 44- and 46-bit.
|
|
|
1029 // We somehow need to figure out which one we are using now and choose
|
|
|
1030 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL.
|
|
|
1031 // Note that with 'ulimit -s unlimited' the stack is moved away from the top
|
|
|
1032 // of the address space, so simply checking the stack address is not enough.
|
|
|
1033 // This should (does) work for both PowerPC64 Endian modes.
|
|
|
1034 // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit.
|
|
|
1035 return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1;
|
|
|
1036 # elif defined(__mips64)
|
|
|
1037 return (1ULL << 40) - 1; // 0x000000ffffffffffUL;
|
|
|
1038 # elif defined(__s390x__)
|
|
|
1039 return (1ULL << 53) - 1; // 0x001fffffffffffffUL;
|
|
|
1040 #elif defined(__sparc__)
|
|
|
1041 return ~(uptr)0;
|
|
|
1042 # else
|
|
|
1043 return (1ULL << 47) - 1; // 0x00007fffffffffffUL;
|
|
|
1044 # endif
|
|
|
1045 #else // SANITIZER_WORDSIZE == 32
|
|
|
1046 # if defined(__s390__)
|
|
|
1047 return (1ULL << 31) - 1; // 0x7fffffff;
|
|
|
1048 # else
|
|
|
1049 return (1ULL << 32) - 1; // 0xffffffff;
|
|
|
1050 # endif
|
|
|
1051 #endif // SANITIZER_WORDSIZE
|
|
|
1052 }
|
|
|
1053
|
|
|
1054 uptr GetMaxUserVirtualAddress() {
|
|
|
1055 uptr addr = GetMaxVirtualAddress();
|
|
|
1056 #if SANITIZER_WORDSIZE == 32 && !defined(__s390__)
|
|
|
1057 if (!common_flags()->full_address_space)
|
|
|
1058 addr -= GetKernelAreaSize();
|
|
|
1059 CHECK_LT(reinterpret_cast<uptr>(&addr), addr);
|
|
|
1060 #endif
|
|
|
1061 return addr;
|
|
|
1062 }
|
|
|
1063
|
|
|
1064 #if !SANITIZER_ANDROID
|
|
|
1065 uptr GetPageSize() {
|
|
|
1066 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__))
|
|
|
1067 return EXEC_PAGESIZE;
|
|
|
1068 #elif SANITIZER_FREEBSD || SANITIZER_NETBSD
|
|
|
1069 // Use sysctl as sysconf can trigger interceptors internally.
|
|
|
1070 int pz = 0;
|
|
|
1071 uptr pzl = sizeof(pz);
|
|
|
1072 int mib[2] = {CTL_HW, HW_PAGESIZE};
|
|
|
1073 int rv = internal_sysctl(mib, 2, &pz, &pzl, nullptr, 0);
|
|
|
1074 CHECK_EQ(rv, 0);
|
|
|
1075 return (uptr)pz;
|
|
|
1076 #elif SANITIZER_USE_GETAUXVAL
|
|
|
1077 return getauxval(AT_PAGESZ);
|
|
|
1078 #else
|
|
|
1079 return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy.
|
|
|
1080 #endif
|
|
|
1081 }
|
|
|
1082 #endif // !SANITIZER_ANDROID
|
|
|
1083
|
|
|
1084 #if !SANITIZER_OPENBSD
|
|
|
1085 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
|
|
|
1086 #if SANITIZER_SOLARIS
|
|
|
1087 const char *default_module_name = getexecname();
|
|
|
1088 CHECK_NE(default_module_name, NULL);
|
|
|
1089 return internal_snprintf(buf, buf_len, "%s", default_module_name);
|
|
|
1090 #else
|
|
|
1091 #if SANITIZER_FREEBSD || SANITIZER_NETBSD
|
|
|
1092 #if SANITIZER_FREEBSD
|
|
|
1093 const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
|
|
|
1094 #else
|
|
|
1095 const int Mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME};
|
|
|
1096 #endif
|
|
|
1097 const char *default_module_name = "kern.proc.pathname";
|
|
|
1098 uptr Size = buf_len;
|
|
|
1099 bool IsErr =
|
|
|
1100 (internal_sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0);
|
|
|
1101 int readlink_error = IsErr ? errno : 0;
|
|
|
1102 uptr module_name_len = Size;
|
|
|
1103 #else
|
|
|
1104 const char *default_module_name = "/proc/self/exe";
|
|
|
1105 uptr module_name_len = internal_readlink(
|
|
|
1106 default_module_name, buf, buf_len);
|
|
|
1107 int readlink_error;
|
|
|
1108 bool IsErr = internal_iserror(module_name_len, &readlink_error);
|
|
|
1109 #endif // SANITIZER_SOLARIS
|
|
|
1110 if (IsErr) {
|
|
|
1111 // We can't read binary name for some reason, assume it's unknown.
|
|
|
1112 Report("WARNING: reading executable name failed with errno %d, "
|
|
|
1113 "some stack frames may not be symbolized\n", readlink_error);
|
|
|
1114 module_name_len = internal_snprintf(buf, buf_len, "%s",
|
|
|
1115 default_module_name);
|
|
|
1116 CHECK_LT(module_name_len, buf_len);
|
|
|
1117 }
|
|
|
1118 return module_name_len;
|
|
|
1119 #endif
|
|
|
1120 }
|
|
|
1121 #endif // !SANITIZER_OPENBSD
|
|
|
1122
|
|
|
1123 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) {
|
|
|
1124 #if SANITIZER_LINUX
|
|
|
1125 char *tmpbuf;
|
|
|
1126 uptr tmpsize;
|
|
|
1127 uptr tmplen;
|
|
|
1128 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen,
|
|
|
1129 1024 * 1024)) {
|
|
|
1130 internal_strncpy(buf, tmpbuf, buf_len);
|
|
|
1131 UnmapOrDie(tmpbuf, tmpsize);
|
|
|
1132 return internal_strlen(buf);
|
|
|
1133 }
|
|
|
1134 #endif
|
|
|
1135 return ReadBinaryName(buf, buf_len);
|
|
|
1136 }
|
|
|
1137
|
|
|
1138 // Match full names of the form /path/to/base_name{-,.}*
|
|
|
1139 bool LibraryNameIs(const char *full_name, const char *base_name) {
|
|
|
1140 const char *name = full_name;
|
|
|
1141 // Strip path.
|
|
|
1142 while (*name != '\0') name++;
|
|
|
1143 while (name > full_name && *name != '/') name--;
|
|
|
1144 if (*name == '/') name++;
|
|
|
1145 uptr base_name_length = internal_strlen(base_name);
|
|
|
1146 if (internal_strncmp(name, base_name, base_name_length)) return false;
|
|
|
1147 return (name[base_name_length] == '-' || name[base_name_length] == '.');
|
|
|
1148 }
|
|
|
1149
|
|
|
1150 #if !SANITIZER_ANDROID
|
|
|
1151 // Call cb for each region mapped by map.
|
|
|
1152 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) {
|
|
|
1153 CHECK_NE(map, nullptr);
|
|
|
1154 #if !SANITIZER_FREEBSD && !SANITIZER_OPENBSD
|
|
|
1155 typedef ElfW(Phdr) Elf_Phdr;
|
|
|
1156 typedef ElfW(Ehdr) Elf_Ehdr;
|
|
|
1157 #endif // !SANITIZER_FREEBSD && !SANITIZER_OPENBSD
|
|
|
1158 char *base = (char *)map->l_addr;
|
|
|
1159 Elf_Ehdr *ehdr = (Elf_Ehdr *)base;
|
|
|
1160 char *phdrs = base + ehdr->e_phoff;
|
|
|
1161 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize;
|
|
|
1162
|
|
|
1163 // Find the segment with the minimum base so we can "relocate" the p_vaddr
|
|
|
1164 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC
|
|
|
1165 // objects have a non-zero base.
|
|
|
1166 uptr preferred_base = (uptr)-1;
|
|
|
1167 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) {
|
|
|
1168 Elf_Phdr *phdr = (Elf_Phdr *)iter;
|
|
|
1169 if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr)
|
|
|
1170 preferred_base = (uptr)phdr->p_vaddr;
|
|
|
1171 }
|
|
|
1172
|
|
|
1173 // Compute the delta from the real base to get a relocation delta.
|
|
|
1174 sptr delta = (uptr)base - preferred_base;
|
|
|
1175 // Now we can figure out what the loader really mapped.
|
|
|
1176 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) {
|
|
|
1177 Elf_Phdr *phdr = (Elf_Phdr *)iter;
|
|
|
1178 if (phdr->p_type == PT_LOAD) {
|
|
|
1179 uptr seg_start = phdr->p_vaddr + delta;
|
|
|
1180 uptr seg_end = seg_start + phdr->p_memsz;
|
|
|
1181 // None of these values are aligned. We consider the ragged edges of the
|
|
|
1182 // load command as defined, since they are mapped from the file.
|
|
|
1183 seg_start = RoundDownTo(seg_start, GetPageSizeCached());
|
|
|
1184 seg_end = RoundUpTo(seg_end, GetPageSizeCached());
|
|
|
1185 cb((void *)seg_start, seg_end - seg_start);
|
|
|
1186 }
|
|
|
1187 }
|
|
|
1188 }
|
|
|
1189 #endif
|
|
|
1190
|
|
|
1191 #if defined(__x86_64__) && SANITIZER_LINUX
|
|
|
1192 // We cannot use glibc's clone wrapper, because it messes with the child
|
|
|
1193 // task's TLS. It writes the PID and TID of the child task to its thread
|
|
|
1194 // descriptor, but in our case the child task shares the thread descriptor with
|
|
|
1195 // the parent (because we don't know how to allocate a new thread
|
|
|
1196 // descriptor to keep glibc happy). So the stock version of clone(), when
|
|
|
1197 // used with CLONE_VM, would end up corrupting the parent's thread descriptor.
|
|
|
1198 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
|
|
|
1199 int *parent_tidptr, void *newtls, int *child_tidptr) {
|
|
|
1200 long long res;
|
|
|
1201 if (!fn || !child_stack)
|
|
|
1202 return -EINVAL;
|
|
|
1203 CHECK_EQ(0, (uptr)child_stack % 16);
|
|
|
1204 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
|
|
|
1205 ((unsigned long long *)child_stack)[0] = (uptr)fn;
|
|
|
1206 ((unsigned long long *)child_stack)[1] = (uptr)arg;
|
|
|
1207 register void *r8 __asm__("r8") = newtls;
|
|
|
1208 register int *r10 __asm__("r10") = child_tidptr;
|
|
|
1209 __asm__ __volatile__(
|
|
|
1210 /* %rax = syscall(%rax = SYSCALL(clone),
|
|
|
1211 * %rdi = flags,
|
|
|
1212 * %rsi = child_stack,
|
|
|
1213 * %rdx = parent_tidptr,
|
|
|
1214 * %r8 = new_tls,
|
|
|
1215 * %r10 = child_tidptr)
|
|
|
1216 */
|
|
|
1217 "syscall\n"
|
|
|
1218
|
|
|
1219 /* if (%rax != 0)
|
|
|
1220 * return;
|
|
|
1221 */
|
|
|
1222 "testq %%rax,%%rax\n"
|
|
|
1223 "jnz 1f\n"
|
|
|
1224
|
|
|
1225 /* In the child. Terminate unwind chain. */
|
|
|
1226 // XXX: We should also terminate the CFI unwind chain
|
|
|
1227 // here. Unfortunately clang 3.2 doesn't support the
|
|
|
1228 // necessary CFI directives, so we skip that part.
|
|
|
1229 "xorq %%rbp,%%rbp\n"
|
|
|
1230
|
|
|
1231 /* Call "fn(arg)". */
|
|
|
1232 "popq %%rax\n"
|
|
|
1233 "popq %%rdi\n"
|
|
|
1234 "call *%%rax\n"
|
|
|
1235
|
|
|
1236 /* Call _exit(%rax). */
|
|
|
1237 "movq %%rax,%%rdi\n"
|
|
|
1238 "movq %2,%%rax\n"
|
|
|
1239 "syscall\n"
|
|
|
1240
|
|
|
1241 /* Return to parent. */
|
|
|
1242 "1:\n"
|
|
|
1243 : "=a" (res)
|
|
|
1244 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)),
|
|
|
1245 "S"(child_stack),
|
|
|
1246 "D"(flags),
|
|
|
1247 "d"(parent_tidptr),
|
|
|
1248 "r"(r8),
|
|
|
1249 "r"(r10)
|
|
|
1250 : "memory", "r11", "rcx");
|
|
|
1251 return res;
|
|
|
1252 }
|
|
|
1253 #elif defined(__mips__)
|
|
|
1254 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
|
|
|
1255 int *parent_tidptr, void *newtls, int *child_tidptr) {
|
|
|
1256 long long res;
|
|
|
1257 if (!fn || !child_stack)
|
|
|
1258 return -EINVAL;
|
|
|
1259 CHECK_EQ(0, (uptr)child_stack % 16);
|
|
|
1260 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
|
|
|
1261 ((unsigned long long *)child_stack)[0] = (uptr)fn;
|
|
|
1262 ((unsigned long long *)child_stack)[1] = (uptr)arg;
|
|
|
1263 register void *a3 __asm__("$7") = newtls;
|
|
|
1264 register int *a4 __asm__("$8") = child_tidptr;
|
|
|
1265 // We don't have proper CFI directives here because it requires alot of code
|
|
|
1266 // for very marginal benefits.
|
|
|
1267 __asm__ __volatile__(
|
|
|
1268 /* $v0 = syscall($v0 = __NR_clone,
|
|
|
1269 * $a0 = flags,
|
|
|
1270 * $a1 = child_stack,
|
|
|
1271 * $a2 = parent_tidptr,
|
|
|
1272 * $a3 = new_tls,
|
|
|
1273 * $a4 = child_tidptr)
|
|
|
1274 */
|
|
|
1275 ".cprestore 16;\n"
|
|
|
1276 "move $4,%1;\n"
|
|
|
1277 "move $5,%2;\n"
|
|
|
1278 "move $6,%3;\n"
|
|
|
1279 "move $7,%4;\n"
|
|
|
1280 /* Store the fifth argument on stack
|
|
|
1281 * if we are using 32-bit abi.
|
|
|
1282 */
|
|
|
1283 #if SANITIZER_WORDSIZE == 32
|
|
|
1284 "lw %5,16($29);\n"
|
|
|
1285 #else
|
|
|
1286 "move $8,%5;\n"
|
|
|
1287 #endif
|
|
|
1288 "li $2,%6;\n"
|
|
|
1289 "syscall;\n"
|
|
|
1290
|
|
|
1291 /* if ($v0 != 0)
|
|
|
1292 * return;
|
|
|
1293 */
|
|
|
1294 "bnez $2,1f;\n"
|
|
|
1295
|
|
|
1296 /* Call "fn(arg)". */
|
|
|
1297 #if SANITIZER_WORDSIZE == 32
|
|
|
1298 #ifdef __BIG_ENDIAN__
|
|
|
1299 "lw $25,4($29);\n"
|
|
|
1300 "lw $4,12($29);\n"
|
|
|
1301 #else
|
|
|
1302 "lw $25,0($29);\n"
|
|
|
1303 "lw $4,8($29);\n"
|
|
|
1304 #endif
|
|
|
1305 #else
|
|
|
1306 "ld $25,0($29);\n"
|
|
|
1307 "ld $4,8($29);\n"
|
|
|
1308 #endif
|
|
|
1309 "jal $25;\n"
|
|
|
1310
|
|
|
1311 /* Call _exit($v0). */
|
|
|
1312 "move $4,$2;\n"
|
|
|
1313 "li $2,%7;\n"
|
|
|
1314 "syscall;\n"
|
|
|
1315
|
|
|
1316 /* Return to parent. */
|
|
|
1317 "1:\n"
|
|
|
1318 : "=r" (res)
|
|
|
1319 : "r"(flags),
|
|
|
1320 "r"(child_stack),
|
|
|
1321 "r"(parent_tidptr),
|
|
|
1322 "r"(a3),
|
|
|
1323 "r"(a4),
|
|
|
1324 "i"(__NR_clone),
|
|
|
1325 "i"(__NR_exit)
|
|
|
1326 : "memory", "$29" );
|
|
|
1327 return res;
|
|
|
1328 }
|
|
|
1329 #elif defined(__aarch64__)
|
|
|
1330 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
|
|
|
1331 int *parent_tidptr, void *newtls, int *child_tidptr) {
|
|
|
1332 long long res;
|
|
|
1333 if (!fn || !child_stack)
|
|
|
1334 return -EINVAL;
|
|
|
1335 CHECK_EQ(0, (uptr)child_stack % 16);
|
|
|
1336 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
|
|
|
1337 ((unsigned long long *)child_stack)[0] = (uptr)fn;
|
|
|
1338 ((unsigned long long *)child_stack)[1] = (uptr)arg;
|
|
|
1339
|
|
|
1340 register int (*__fn)(void *) __asm__("x0") = fn;
|
|
|
1341 register void *__stack __asm__("x1") = child_stack;
|
|
|
1342 register int __flags __asm__("x2") = flags;
|
|
|
1343 register void *__arg __asm__("x3") = arg;
|
|
|
1344 register int *__ptid __asm__("x4") = parent_tidptr;
|
|
|
1345 register void *__tls __asm__("x5") = newtls;
|
|
|
1346 register int *__ctid __asm__("x6") = child_tidptr;
|
|
|
1347
|
|
|
1348 __asm__ __volatile__(
|
|
|
1349 "mov x0,x2\n" /* flags */
|
|
|
1350 "mov x2,x4\n" /* ptid */
|
|
|
1351 "mov x3,x5\n" /* tls */
|
|
|
1352 "mov x4,x6\n" /* ctid */
|
|
|
1353 "mov x8,%9\n" /* clone */
|
|
|
1354
|
|
|
1355 "svc 0x0\n"
|
|
|
1356
|
|
|
1357 /* if (%r0 != 0)
|
|
|
1358 * return %r0;
|
|
|
1359 */
|
|
|
1360 "cmp x0, #0\n"
|
|
|
1361 "bne 1f\n"
|
|
|
1362
|
|
|
1363 /* In the child, now. Call "fn(arg)". */
|
|
|
1364 "ldp x1, x0, [sp], #16\n"
|
|
|
1365 "blr x1\n"
|
|
|
1366
|
|
|
1367 /* Call _exit(%r0). */
|
|
|
1368 "mov x8, %10\n"
|
|
|
1369 "svc 0x0\n"
|
|
|
1370 "1:\n"
|
|
|
1371
|
|
|
1372 : "=r" (res)
|
|
|
1373 : "i"(-EINVAL),
|
|
|
1374 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg),
|
|
|
1375 "r"(__ptid), "r"(__tls), "r"(__ctid),
|
|
|
1376 "i"(__NR_clone), "i"(__NR_exit)
|
|
|
1377 : "x30", "memory");
|
|
|
1378 return res;
|
|
|
1379 }
|
|
|
1380 #elif defined(__powerpc64__)
|
|
|
1381 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
|
|
|
1382 int *parent_tidptr, void *newtls, int *child_tidptr) {
|
|
|
1383 long long res;
|
|
|
1384 // Stack frame structure.
|
|
|
1385 #if SANITIZER_PPC64V1
|
|
|
1386 // Back chain == 0 (SP + 112)
|
|
|
1387 // Frame (112 bytes):
|
|
|
1388 // Parameter save area (SP + 48), 8 doublewords
|
|
|
1389 // TOC save area (SP + 40)
|
|
|
1390 // Link editor doubleword (SP + 32)
|
|
|
1391 // Compiler doubleword (SP + 24)
|
|
|
1392 // LR save area (SP + 16)
|
|
|
1393 // CR save area (SP + 8)
|
|
|
1394 // Back chain (SP + 0)
|
|
|
1395 # define FRAME_SIZE 112
|
|
|
1396 # define FRAME_TOC_SAVE_OFFSET 40
|
|
|
1397 #elif SANITIZER_PPC64V2
|
|
|
1398 // Back chain == 0 (SP + 32)
|
|
|
1399 // Frame (32 bytes):
|
|
|
1400 // TOC save area (SP + 24)
|
|
|
1401 // LR save area (SP + 16)
|
|
|
1402 // CR save area (SP + 8)
|
|
|
1403 // Back chain (SP + 0)
|
|
|
1404 # define FRAME_SIZE 32
|
|
|
1405 # define FRAME_TOC_SAVE_OFFSET 24
|
|
|
1406 #else
|
|
|
1407 # error "Unsupported PPC64 ABI"
|
|
|
1408 #endif
|
|
|
1409 if (!fn || !child_stack)
|
|
|
1410 return -EINVAL;
|
|
|
1411 CHECK_EQ(0, (uptr)child_stack % 16);
|
|
|
1412
|
|
|
1413 register int (*__fn)(void *) __asm__("r3") = fn;
|
|
|
1414 register void *__cstack __asm__("r4") = child_stack;
|
|
|
1415 register int __flags __asm__("r5") = flags;
|
|
|
1416 register void *__arg __asm__("r6") = arg;
|
|
|
1417 register int *__ptidptr __asm__("r7") = parent_tidptr;
|
|
|
1418 register void *__newtls __asm__("r8") = newtls;
|
|
|
1419 register int *__ctidptr __asm__("r9") = child_tidptr;
|
|
|
1420
|
|
|
1421 __asm__ __volatile__(
|
|
|
1422 /* fn and arg are saved across the syscall */
|
|
|
1423 "mr 28, %5\n\t"
|
|
|
1424 "mr 27, %8\n\t"
|
|
|
1425
|
|
|
1426 /* syscall
|
|
|
1427 r0 == __NR_clone
|
|
|
1428 r3 == flags
|
|
|
1429 r4 == child_stack
|
|
|
1430 r5 == parent_tidptr
|
|
|
1431 r6 == newtls
|
|
|
1432 r7 == child_tidptr */
|
|
|
1433 "mr 3, %7\n\t"
|
|
|
1434 "mr 5, %9\n\t"
|
|
|
1435 "mr 6, %10\n\t"
|
|
|
1436 "mr 7, %11\n\t"
|
|
|
1437 "li 0, %3\n\t"
|
|
|
1438 "sc\n\t"
|
|
|
1439
|
|
|
1440 /* Test if syscall was successful */
|
|
|
1441 "cmpdi cr1, 3, 0\n\t"
|
|
|
1442 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t"
|
|
|
1443 "bne- cr1, 1f\n\t"
|
|
|
1444
|
|
|
1445 /* Set up stack frame */
|
|
|
1446 "li 29, 0\n\t"
|
|
|
1447 "stdu 29, -8(1)\n\t"
|
|
|
1448 "stdu 1, -%12(1)\n\t"
|
|
|
1449 /* Do the function call */
|
|
|
1450 "std 2, %13(1)\n\t"
|
|
|
1451 #if SANITIZER_PPC64V1
|
|
|
1452 "ld 0, 0(28)\n\t"
|
|
|
1453 "ld 2, 8(28)\n\t"
|
|
|
1454 "mtctr 0\n\t"
|
|
|
1455 #elif SANITIZER_PPC64V2
|
|
|
1456 "mr 12, 28\n\t"
|
|
|
1457 "mtctr 12\n\t"
|
|
|
1458 #else
|
|
|
1459 # error "Unsupported PPC64 ABI"
|
|
|
1460 #endif
|
|
|
1461 "mr 3, 27\n\t"
|
|
|
1462 "bctrl\n\t"
|
|
|
1463 "ld 2, %13(1)\n\t"
|
|
|
1464
|
|
|
1465 /* Call _exit(r3) */
|
|
|
1466 "li 0, %4\n\t"
|
|
|
1467 "sc\n\t"
|
|
|
1468
|
|
|
1469 /* Return to parent */
|
|
|
1470 "1:\n\t"
|
|
|
1471 "mr %0, 3\n\t"
|
|
|
1472 : "=r" (res)
|
|
|
1473 : "0" (-1),
|
|
|
1474 "i" (EINVAL),
|
|
|
1475 "i" (__NR_clone),
|
|
|
1476 "i" (__NR_exit),
|
|
|
1477 "r" (__fn),
|
|
|
1478 "r" (__cstack),
|
|
|
1479 "r" (__flags),
|
|
|
1480 "r" (__arg),
|
|
|
1481 "r" (__ptidptr),
|
|
|
1482 "r" (__newtls),
|
|
|
1483 "r" (__ctidptr),
|
|
|
1484 "i" (FRAME_SIZE),
|
|
|
1485 "i" (FRAME_TOC_SAVE_OFFSET)
|
|
|
1486 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29");
|
|
|
1487 return res;
|
|
|
1488 }
|
|
|
1489 #elif defined(__i386__) && SANITIZER_LINUX
|
|
|
1490 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
|
|
|
1491 int *parent_tidptr, void *newtls, int *child_tidptr) {
|
|
|
1492 int res;
|
|
|
1493 if (!fn || !child_stack)
|
|
|
1494 return -EINVAL;
|
|
|
1495 CHECK_EQ(0, (uptr)child_stack % 16);
|
|
|
1496 child_stack = (char *)child_stack - 7 * sizeof(unsigned int);
|
|
|
1497 ((unsigned int *)child_stack)[0] = (uptr)flags;
|
|
|
1498 ((unsigned int *)child_stack)[1] = (uptr)0;
|
|
|
1499 ((unsigned int *)child_stack)[2] = (uptr)fn;
|
|
|
1500 ((unsigned int *)child_stack)[3] = (uptr)arg;
|
|
|
1501 __asm__ __volatile__(
|
|
|
1502 /* %eax = syscall(%eax = SYSCALL(clone),
|
|
|
1503 * %ebx = flags,
|
|
|
1504 * %ecx = child_stack,
|
|
|
1505 * %edx = parent_tidptr,
|
|
|
1506 * %esi = new_tls,
|
|
|
1507 * %edi = child_tidptr)
|
|
|
1508 */
|
|
|
1509
|
|
|
1510 /* Obtain flags */
|
|
|
1511 "movl (%%ecx), %%ebx\n"
|
|
|
1512 /* Do the system call */
|
|
|
1513 "pushl %%ebx\n"
|
|
|
1514 "pushl %%esi\n"
|
|
|
1515 "pushl %%edi\n"
|
|
|
1516 /* Remember the flag value. */
|
|
|
1517 "movl %%ebx, (%%ecx)\n"
|
|
|
1518 "int $0x80\n"
|
|
|
1519 "popl %%edi\n"
|
|
|
1520 "popl %%esi\n"
|
|
|
1521 "popl %%ebx\n"
|
|
|
1522
|
|
|
1523 /* if (%eax != 0)
|
|
|
1524 * return;
|
|
|
1525 */
|
|
|
1526
|
|
|
1527 "test %%eax,%%eax\n"
|
|
|
1528 "jnz 1f\n"
|
|
|
1529
|
|
|
1530 /* terminate the stack frame */
|
|
|
1531 "xorl %%ebp,%%ebp\n"
|
|
|
1532 /* Call FN. */
|
|
|
1533 "call *%%ebx\n"
|
|
|
1534 #ifdef PIC
|
|
|
1535 "call here\n"
|
|
|
1536 "here:\n"
|
|
|
1537 "popl %%ebx\n"
|
|
|
1538 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n"
|
|
|
1539 #endif
|
|
|
1540 /* Call exit */
|
|
|
1541 "movl %%eax, %%ebx\n"
|
|
|
1542 "movl %2, %%eax\n"
|
|
|
1543 "int $0x80\n"
|
|
|
1544 "1:\n"
|
|
|
1545 : "=a" (res)
|
|
|
1546 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)),
|
|
|
1547 "c"(child_stack),
|
|
|
1548 "d"(parent_tidptr),
|
|
|
1549 "S"(newtls),
|
|
|
1550 "D"(child_tidptr)
|
|
|
1551 : "memory");
|
|
|
1552 return res;
|
|
|
1553 }
|
|
|
1554 #elif defined(__arm__) && SANITIZER_LINUX
|
|
|
1555 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
|
|
|
1556 int *parent_tidptr, void *newtls, int *child_tidptr) {
|
|
|
1557 unsigned int res;
|
|
|
1558 if (!fn || !child_stack)
|
|
|
1559 return -EINVAL;
|
|
|
1560 child_stack = (char *)child_stack - 2 * sizeof(unsigned int);
|
|
|
1561 ((unsigned int *)child_stack)[0] = (uptr)fn;
|
|
|
1562 ((unsigned int *)child_stack)[1] = (uptr)arg;
|
|
|
1563 register int r0 __asm__("r0") = flags;
|
|
|
1564 register void *r1 __asm__("r1") = child_stack;
|
|
|
1565 register int *r2 __asm__("r2") = parent_tidptr;
|
|
|
1566 register void *r3 __asm__("r3") = newtls;
|
|
|
1567 register int *r4 __asm__("r4") = child_tidptr;
|
|
|
1568 register int r7 __asm__("r7") = __NR_clone;
|
|
|
1569
|
|
|
1570 #if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__)
|
|
|
1571 # define ARCH_HAS_BX
|
|
|
1572 #endif
|
|
|
1573 #if __ARM_ARCH > 4
|
|
|
1574 # define ARCH_HAS_BLX
|
|
|
1575 #endif
|
|
|
1576
|
|
|
1577 #ifdef ARCH_HAS_BX
|
|
|
1578 # ifdef ARCH_HAS_BLX
|
|
|
1579 # define BLX(R) "blx " #R "\n"
|
|
|
1580 # else
|
|
|
1581 # define BLX(R) "mov lr, pc; bx " #R "\n"
|
|
|
1582 # endif
|
|
|
1583 #else
|
|
|
1584 # define BLX(R) "mov lr, pc; mov pc," #R "\n"
|
|
|
1585 #endif
|
|
|
1586
|
|
|
1587 __asm__ __volatile__(
|
|
|
1588 /* %r0 = syscall(%r7 = SYSCALL(clone),
|
|
|
1589 * %r0 = flags,
|
|
|
1590 * %r1 = child_stack,
|
|
|
1591 * %r2 = parent_tidptr,
|
|
|
1592 * %r3 = new_tls,
|
|
|
1593 * %r4 = child_tidptr)
|
|
|
1594 */
|
|
|
1595
|
|
|
1596 /* Do the system call */
|
|
|
1597 "swi 0x0\n"
|
|
|
1598
|
|
|
1599 /* if (%r0 != 0)
|
|
|
1600 * return %r0;
|
|
|
1601 */
|
|
|
1602 "cmp r0, #0\n"
|
|
|
1603 "bne 1f\n"
|
|
|
1604
|
|
|
1605 /* In the child, now. Call "fn(arg)". */
|
|
|
1606 "ldr r0, [sp, #4]\n"
|
|
|
1607 "ldr ip, [sp], #8\n"
|
|
|
1608 BLX(ip)
|
|
|
1609 /* Call _exit(%r0). */
|
|
|
1610 "mov r7, %7\n"
|
|
|
1611 "swi 0x0\n"
|
|
|
1612 "1:\n"
|
|
|
1613 "mov %0, r0\n"
|
|
|
1614 : "=r"(res)
|
|
|
1615 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7),
|
|
|
1616 "i"(__NR_exit)
|
|
|
1617 : "memory");
|
|
|
1618 return res;
|
|
|
1619 }
|
|
|
1620 #endif // defined(__x86_64__) && SANITIZER_LINUX
|
|
|
1621
|
|
|
1622 #if SANITIZER_ANDROID
|
|
|
1623 #if __ANDROID_API__ < 21
|
|
|
1624 extern "C" __attribute__((weak)) int dl_iterate_phdr(
|
|
|
1625 int (*)(struct dl_phdr_info *, size_t, void *), void *);
|
|
|
1626 #endif
|
|
|
1627
|
|
|
1628 static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size,
|
|
|
1629 void *data) {
|
|
|
1630 // Any name starting with "lib" indicates a bug in L where library base names
|
|
|
1631 // are returned instead of paths.
|
|
|
1632 if (info->dlpi_name && info->dlpi_name[0] == 'l' &&
|
|
|
1633 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') {
|
|
|
1634 *(bool *)data = true;
|
|
|
1635 return 1;
|
|
|
1636 }
|
|
|
1637 return 0;
|
|
|
1638 }
|
|
|
1639
|
|
|
1640 static atomic_uint32_t android_api_level;
|
|
|
1641
|
|
|
1642 static AndroidApiLevel AndroidDetectApiLevelStatic() {
|
|
|
1643 #if __ANDROID_API__ <= 19
|
|
|
1644 return ANDROID_KITKAT;
|
|
|
1645 #elif __ANDROID_API__ <= 22
|
|
|
1646 return ANDROID_LOLLIPOP_MR1;
|
|
|
1647 #else
|
|
|
1648 return ANDROID_POST_LOLLIPOP;
|
|
|
1649 #endif
|
|
|
1650 }
|
|
|
1651
|
|
|
1652 static AndroidApiLevel AndroidDetectApiLevel() {
|
|
|
1653 if (!&dl_iterate_phdr)
|
|
|
1654 return ANDROID_KITKAT; // K or lower
|
|
|
1655 bool base_name_seen = false;
|
|
|
1656 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen);
|
|
|
1657 if (base_name_seen)
|
|
|
1658 return ANDROID_LOLLIPOP_MR1; // L MR1
|
|
|
1659 return ANDROID_POST_LOLLIPOP; // post-L
|
|
|
1660 // Plain L (API level 21) is completely broken wrt ASan and not very
|
|
|
1661 // interesting to detect.
|
|
|
1662 }
|
|
|
1663
|
|
|
1664 extern "C" __attribute__((weak)) void* _DYNAMIC;
|
|
|
1665
|
|
|
1666 AndroidApiLevel AndroidGetApiLevel() {
|
|
|
1667 AndroidApiLevel level =
|
|
|
1668 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed);
|
|
|
1669 if (level) return level;
|
|
|
1670 level = &_DYNAMIC == nullptr ? AndroidDetectApiLevelStatic()
|
|
|
1671 : AndroidDetectApiLevel();
|
|
|
1672 atomic_store(&android_api_level, level, memory_order_relaxed);
|
|
|
1673 return level;
|
|
|
1674 }
|
|
|
1675
|
|
|
1676 #endif
|
|
|
1677
|
|
|
1678 static HandleSignalMode GetHandleSignalModeImpl(int signum) {
|
|
|
1679 switch (signum) {
|
|
|
1680 case SIGABRT:
|
|
|
1681 return common_flags()->handle_abort;
|
|
|
1682 case SIGILL:
|
|
|
1683 return common_flags()->handle_sigill;
|
|
|
1684 case SIGTRAP:
|
|
|
1685 return common_flags()->handle_sigtrap;
|
|
|
1686 case SIGFPE:
|
|
|
1687 return common_flags()->handle_sigfpe;
|
|
|
1688 case SIGSEGV:
|
|
|
1689 return common_flags()->handle_segv;
|
|
|
1690 case SIGBUS:
|
|
|
1691 return common_flags()->handle_sigbus;
|
|
|
1692 }
|
|
|
1693 return kHandleSignalNo;
|
|
|
1694 }
|
|
|
1695
|
|
|
1696 HandleSignalMode GetHandleSignalMode(int signum) {
|
|
|
1697 HandleSignalMode result = GetHandleSignalModeImpl(signum);
|
|
|
1698 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler)
|
|
|
1699 return kHandleSignalExclusive;
|
|
|
1700 return result;
|
|
|
1701 }
|
|
|
1702
|
|
|
1703 #if !SANITIZER_GO
|
|
|
1704 void *internal_start_thread(void(*func)(void *arg), void *arg) {
|
|
|
1705 // Start the thread with signals blocked, otherwise it can steal user signals.
|
|
|
1706 __sanitizer_sigset_t set, old;
|
|
|
1707 internal_sigfillset(&set);
|
|
|
1708 #if SANITIZER_LINUX && !SANITIZER_ANDROID
|
|
|
1709 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked
|
|
|
1710 // on any thread, setuid call hangs (see test/tsan/setuid.c).
|
|
|
1711 internal_sigdelset(&set, 33);
|
|
|
1712 #endif
|
|
|
1713 internal_sigprocmask(SIG_SETMASK, &set, &old);
|
|
|
1714 void *th;
|
|
|
1715 real_pthread_create(&th, nullptr, (void*(*)(void *arg))func, arg);
|
|
|
1716 internal_sigprocmask(SIG_SETMASK, &old, nullptr);
|
|
|
1717 return th;
|
|
|
1718 }
|
|
|
1719
|
|
|
1720 void internal_join_thread(void *th) {
|
|
|
1721 real_pthread_join(th, nullptr);
|
|
|
1722 }
|
|
|
1723 #else
|
|
|
1724 void *internal_start_thread(void (*func)(void *), void *arg) { return 0; }
|
|
|
1725
|
|
|
1726 void internal_join_thread(void *th) {}
|
|
|
1727 #endif
|
|
|
1728
|
|
|
1729 #if defined(__aarch64__)
|
|
|
1730 // Android headers in the older NDK releases miss this definition.
|
|
|
1731 struct __sanitizer_esr_context {
|
|
|
1732 struct _aarch64_ctx head;
|
|
|
1733 uint64_t esr;
|
|
|
1734 };
|
|
|
1735
|
|
|
1736 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) {
|
|
|
1737 static const u32 kEsrMagic = 0x45535201;
|
|
|
1738 u8 *aux = ucontext->uc_mcontext.__reserved;
|
|
|
1739 while (true) {
|
|
|
1740 _aarch64_ctx *ctx = (_aarch64_ctx *)aux;
|
|
|
1741 if (ctx->size == 0) break;
|
|
|
1742 if (ctx->magic == kEsrMagic) {
|
|
|
1743 *esr = ((__sanitizer_esr_context *)ctx)->esr;
|
|
|
1744 return true;
|
|
|
1745 }
|
|
|
1746 aux += ctx->size;
|
|
|
1747 }
|
|
|
1748 return false;
|
|
|
1749 }
|
|
|
1750 #endif
|
|
|
1751
|
|
|
1752 #if SANITIZER_OPENBSD
|
|
|
1753 using Context = sigcontext;
|
|
|
1754 #else
|
|
|
1755 using Context = ucontext_t;
|
|
|
1756 #endif
|
|
|
1757
|
|
|
1758 SignalContext::WriteFlag SignalContext::GetWriteFlag() const {
|
|
|
1759 Context *ucontext = (Context *)context;
|
|
|
1760 #if defined(__x86_64__) || defined(__i386__)
|
|
|
1761 static const uptr PF_WRITE = 1U << 1;
|
|
|
1762 #if SANITIZER_FREEBSD
|
|
|
1763 uptr err = ucontext->uc_mcontext.mc_err;
|
|
|
1764 #elif SANITIZER_NETBSD
|
|
|
1765 uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR];
|
|
|
1766 #elif SANITIZER_OPENBSD
|
|
|
1767 uptr err = ucontext->sc_err;
|
|
|
1768 #elif SANITIZER_SOLARIS && defined(__i386__)
|
|
|
1769 const int Err = 13;
|
|
|
1770 uptr err = ucontext->uc_mcontext.gregs[Err];
|
|
|
1771 #else
|
|
|
1772 uptr err = ucontext->uc_mcontext.gregs[REG_ERR];
|
|
|
1773 #endif // SANITIZER_FREEBSD
|
|
|
1774 return err & PF_WRITE ? WRITE : READ;
|
|
|
1775 #elif defined(__mips__)
|
|
|
1776 uint32_t *exception_source;
|
|
|
1777 uint32_t faulty_instruction;
|
|
|
1778 uint32_t op_code;
|
|
|
1779
|
|
|
1780 exception_source = (uint32_t *)ucontext->uc_mcontext.pc;
|
|
|
1781 faulty_instruction = (uint32_t)(*exception_source);
|
|
|
1782
|
|
|
1783 op_code = (faulty_instruction >> 26) & 0x3f;
|
|
|
1784
|
|
|
1785 // FIXME: Add support for FPU, microMIPS, DSP, MSA memory instructions.
|
|
|
1786 switch (op_code) {
|
|
|
1787 case 0x28: // sb
|
|
|
1788 case 0x29: // sh
|
|
|
1789 case 0x2b: // sw
|
|
|
1790 case 0x3f: // sd
|
|
|
1791 #if __mips_isa_rev < 6
|
|
|
1792 case 0x2c: // sdl
|
|
|
1793 case 0x2d: // sdr
|
|
|
1794 case 0x2a: // swl
|
|
|
1795 case 0x2e: // swr
|
|
|
1796 #endif
|
|
|
1797 return SignalContext::WRITE;
|
|
|
1798
|
|
|
1799 case 0x20: // lb
|
|
|
1800 case 0x24: // lbu
|
|
|
1801 case 0x21: // lh
|
|
|
1802 case 0x25: // lhu
|
|
|
1803 case 0x23: // lw
|
|
|
1804 case 0x27: // lwu
|
|
|
1805 case 0x37: // ld
|
|
|
1806 #if __mips_isa_rev < 6
|
|
|
1807 case 0x1a: // ldl
|
|
|
1808 case 0x1b: // ldr
|
|
|
1809 case 0x22: // lwl
|
|
|
1810 case 0x26: // lwr
|
|
|
1811 #endif
|
|
|
1812 return SignalContext::READ;
|
|
|
1813 #if __mips_isa_rev == 6
|
|
|
1814 case 0x3b: // pcrel
|
|
|
1815 op_code = (faulty_instruction >> 19) & 0x3;
|
|
|
1816 switch (op_code) {
|
|
|
1817 case 0x1: // lwpc
|
|
|
1818 case 0x2: // lwupc
|
|
|
1819 return SignalContext::READ;
|
|
|
1820 }
|
|
|
1821 #endif
|
|
|
1822 }
|
|
|
1823 return SignalContext::UNKNOWN;
|
|
|
1824 #elif defined(__arm__)
|
|
|
1825 static const uptr FSR_WRITE = 1U << 11;
|
|
|
1826 uptr fsr = ucontext->uc_mcontext.error_code;
|
|
|
1827 return fsr & FSR_WRITE ? WRITE : READ;
|
|
|
1828 #elif defined(__aarch64__)
|
|
|
1829 static const u64 ESR_ELx_WNR = 1U << 6;
|
|
|
1830 u64 esr;
|
|
|
1831 if (!Aarch64GetESR(ucontext, &esr)) return UNKNOWN;
|
|
|
1832 return esr & ESR_ELx_WNR ? WRITE : READ;
|
|
|
1833 #elif defined(__sparc__)
|
|
|
1834 // Decode the instruction to determine the access type.
|
|
|
1835 // From OpenSolaris $SRC/uts/sun4/os/trap.c (get_accesstype).
|
|
|
1836 #if SANITIZER_SOLARIS
|
|
|
1837 uptr pc = ucontext->uc_mcontext.gregs[REG_PC];
|
|
|
1838 #else
|
|
|
1839 // Historical BSDism here.
|
|
|
1840 struct sigcontext *scontext = (struct sigcontext *)context;
|
|
|
1841 #if defined(__arch64__)
|
|
|
1842 uptr pc = scontext->sigc_regs.tpc;
|
|
|
1843 #else
|
|
|
1844 uptr pc = scontext->si_regs.pc;
|
|
|
1845 #endif
|
|
|
1846 #endif
|
|
|
1847 u32 instr = *(u32 *)pc;
|
|
|
1848 return (instr >> 21) & 1 ? WRITE: READ;
|
|
|
1849 #else
|
|
|
1850 (void)ucontext;
|
|
|
1851 return UNKNOWN; // FIXME: Implement.
|
|
|
1852 #endif
|
|
|
1853 }
|
|
|
1854
|
|
|
1855 bool SignalContext::IsTrueFaultingAddress() const {
|
|
|
1856 auto si = static_cast<const siginfo_t *>(siginfo);
|
|
|
1857 // SIGSEGV signals without a true fault address have si_code set to 128.
|
|
|
1858 return si->si_signo == SIGSEGV && si->si_code != 128;
|
|
|
1859 }
|
|
|
1860
|
|
|
1861 void SignalContext::DumpAllRegisters(void *context) {
|
|
|
1862 // FIXME: Implement this.
|
|
|
1863 }
|
|
|
1864
|
|
|
1865 static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
|
|
|
1866 #if SANITIZER_NETBSD
|
|
|
1867 // This covers all NetBSD architectures
|
|
|
1868 ucontext_t *ucontext = (ucontext_t *)context;
|
|
|
1869 *pc = _UC_MACHINE_PC(ucontext);
|
|
|
1870 *bp = _UC_MACHINE_FP(ucontext);
|
|
|
1871 *sp = _UC_MACHINE_SP(ucontext);
|
|
|
1872 #elif defined(__arm__)
|
|
|
1873 ucontext_t *ucontext = (ucontext_t*)context;
|
|
|
1874 *pc = ucontext->uc_mcontext.arm_pc;
|
|
|
1875 *bp = ucontext->uc_mcontext.arm_fp;
|
|
|
1876 *sp = ucontext->uc_mcontext.arm_sp;
|
|
|
1877 #elif defined(__aarch64__)
|
|
|
1878 ucontext_t *ucontext = (ucontext_t*)context;
|
|
|
1879 *pc = ucontext->uc_mcontext.pc;
|
|
|
1880 *bp = ucontext->uc_mcontext.regs[29];
|
|
|
1881 *sp = ucontext->uc_mcontext.sp;
|
|
|
1882 #elif defined(__hppa__)
|
|
|
1883 ucontext_t *ucontext = (ucontext_t*)context;
|
|
|
1884 *pc = ucontext->uc_mcontext.sc_iaoq[0];
|
|
|
1885 /* GCC uses %r3 whenever a frame pointer is needed. */
|
|
|
1886 *bp = ucontext->uc_mcontext.sc_gr[3];
|
|
|
1887 *sp = ucontext->uc_mcontext.sc_gr[30];
|
|
|
1888 #elif defined(__x86_64__)
|
|
|
1889 # if SANITIZER_FREEBSD
|
|
|
1890 ucontext_t *ucontext = (ucontext_t*)context;
|
|
|
1891 *pc = ucontext->uc_mcontext.mc_rip;
|
|
|
1892 *bp = ucontext->uc_mcontext.mc_rbp;
|
|
|
1893 *sp = ucontext->uc_mcontext.mc_rsp;
|
|
|
1894 #elif SANITIZER_OPENBSD
|
|
|
1895 sigcontext *ucontext = (sigcontext *)context;
|
|
|
1896 *pc = ucontext->sc_rip;
|
|
|
1897 *bp = ucontext->sc_rbp;
|
|
|
1898 *sp = ucontext->sc_rsp;
|
|
|
1899 # else
|
|
|
1900 ucontext_t *ucontext = (ucontext_t*)context;
|
|
|
1901 *pc = ucontext->uc_mcontext.gregs[REG_RIP];
|
|
|
1902 *bp = ucontext->uc_mcontext.gregs[REG_RBP];
|
|
|
1903 *sp = ucontext->uc_mcontext.gregs[REG_RSP];
|
|
|
1904 # endif
|
|
|
1905 #elif defined(__i386__)
|
|
|
1906 # if SANITIZER_FREEBSD
|
|
|
1907 ucontext_t *ucontext = (ucontext_t*)context;
|
|
|
1908 *pc = ucontext->uc_mcontext.mc_eip;
|
|
|
1909 *bp = ucontext->uc_mcontext.mc_ebp;
|
|
|
1910 *sp = ucontext->uc_mcontext.mc_esp;
|
|
|
1911 #elif SANITIZER_OPENBSD
|
|
|
1912 sigcontext *ucontext = (sigcontext *)context;
|
|
|
1913 *pc = ucontext->sc_eip;
|
|
|
1914 *bp = ucontext->sc_ebp;
|
|
|
1915 *sp = ucontext->sc_esp;
|
|
|
1916 # else
|
|
|
1917 ucontext_t *ucontext = (ucontext_t*)context;
|
|
|
1918 # if SANITIZER_SOLARIS
|
|
|
1919 /* Use the numeric values: the symbolic ones are undefined by llvm
|
|
|
1920 include/llvm/Support/Solaris.h. */
|
|
|
1921 # ifndef REG_EIP
|
|
|
1922 # define REG_EIP 14 // REG_PC
|
|
|
1923 # endif
|
|
|
1924 # ifndef REG_EBP
|
|
|
1925 # define REG_EBP 6 // REG_FP
|
|
|
1926 # endif
|
|
|
1927 # ifndef REG_ESP
|
|
|
1928 # define REG_ESP 17 // REG_SP
|
|
|
1929 # endif
|
|
|
1930 # endif
|
|
|
1931 *pc = ucontext->uc_mcontext.gregs[REG_EIP];
|
|
|
1932 *bp = ucontext->uc_mcontext.gregs[REG_EBP];
|
|
|
1933 *sp = ucontext->uc_mcontext.gregs[REG_ESP];
|
|
|
1934 # endif
|
|
|
1935 #elif defined(__powerpc__) || defined(__powerpc64__)
|
|
|
1936 ucontext_t *ucontext = (ucontext_t*)context;
|
|
|
1937 *pc = ucontext->uc_mcontext.regs->nip;
|
|
|
1938 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1];
|
|
|
1939 // The powerpc{,64}-linux ABIs do not specify r31 as the frame
|
|
|
1940 // pointer, but GCC always uses r31 when we need a frame pointer.
|
|
|
1941 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31];
|
|
|
1942 #elif defined(__sparc__)
|
|
|
1943 #if defined(__arch64__) || defined(__sparcv9)
|
|
|
1944 #define STACK_BIAS 2047
|
|
|
1945 #else
|
|
|
1946 #define STACK_BIAS 0
|
|
|
1947 # endif
|
|
|
1948 # if SANITIZER_SOLARIS
|
|
|
1949 ucontext_t *ucontext = (ucontext_t *)context;
|
|
|
1950 *pc = ucontext->uc_mcontext.gregs[REG_PC];
|
|
|
1951 *sp = ucontext->uc_mcontext.gregs[REG_O6] + STACK_BIAS;
|
|
|
1952 #else
|
|
|
1953 // Historical BSDism here.
|
|
|
1954 struct sigcontext *scontext = (struct sigcontext *)context;
|
|
|
1955 #if defined(__arch64__)
|
|
|
1956 *pc = scontext->sigc_regs.tpc;
|
|
|
1957 *sp = scontext->sigc_regs.u_regs[14] + STACK_BIAS;
|
|
|
1958 #else
|
|
|
1959 *pc = scontext->si_regs.pc;
|
|
|
1960 *sp = scontext->si_regs.u_regs[14];
|
|
|
1961 #endif
|
|
|
1962 # endif
|
|
|
1963 *bp = (uptr)((uhwptr *)*sp)[14] + STACK_BIAS;
|
|
|
1964 #elif defined(__mips__)
|
|
|
1965 ucontext_t *ucontext = (ucontext_t*)context;
|
|
|
1966 *pc = ucontext->uc_mcontext.pc;
|
|
|
1967 *bp = ucontext->uc_mcontext.gregs[30];
|
|
|
1968 *sp = ucontext->uc_mcontext.gregs[29];
|
|
|
1969 #elif defined(__s390__)
|
|
|
1970 ucontext_t *ucontext = (ucontext_t*)context;
|
|
|
1971 # if defined(__s390x__)
|
|
|
1972 *pc = ucontext->uc_mcontext.psw.addr;
|
|
|
1973 # else
|
|
|
1974 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff;
|
|
|
1975 # endif
|
|
|
1976 *bp = ucontext->uc_mcontext.gregs[11];
|
|
|
1977 *sp = ucontext->uc_mcontext.gregs[15];
|
|
|
1978 #elif defined(__riscv)
|
|
|
1979 ucontext_t *ucontext = (ucontext_t*)context;
|
|
|
1980 *pc = ucontext->uc_mcontext.__gregs[REG_PC];
|
|
|
1981 *bp = ucontext->uc_mcontext.__gregs[REG_S0];
|
|
|
1982 *sp = ucontext->uc_mcontext.__gregs[REG_SP];
|
|
|
1983 #else
|
|
|
1984 # error "Unsupported arch"
|
|
|
1985 #endif
|
|
|
1986 }
|
|
|
1987
|
|
|
1988 void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); }
|
|
|
1989
|
|
|
1990 void InitializePlatformEarly() {
|
|
|
1991 // Do nothing.
|
|
|
1992 }
|
|
|
1993
|
|
|
1994 void MaybeReexec() {
|
|
|
1995 // No need to re-exec on Linux.
|
|
|
1996 }
|
|
|
1997
|
|
|
1998 void CheckASLR() {
|
|
|
1999 #if SANITIZER_NETBSD
|
|
|
2000 int mib[3];
|
|
|
2001 int paxflags;
|
|
|
2002 uptr len = sizeof(paxflags);
|
|
|
2003
|
|
|
2004 mib[0] = CTL_PROC;
|
|
|
2005 mib[1] = internal_getpid();
|
|
|
2006 mib[2] = PROC_PID_PAXFLAGS;
|
|
|
2007
|
|
|
2008 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) {
|
|
|
2009 Printf("sysctl failed\n");
|
|
|
2010 Die();
|
|
|
2011 }
|
|
|
2012
|
|
|
2013 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_ASLR)) {
|
|
|
2014 Printf("This sanitizer is not compatible with enabled ASLR\n");
|
|
|
2015 Die();
|
|
|
2016 }
|
|
|
2017 #elif SANITIZER_PPC64V2
|
|
|
2018 // Disable ASLR for Linux PPC64LE.
|
|
|
2019 int old_personality = personality(0xffffffff);
|
|
|
2020 if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) {
|
|
|
2021 VReport(1, "WARNING: Program is being run with address space layout "
|
|
|
2022 "randomization (ASLR) enabled which prevents the thread and "
|
|
|
2023 "memory sanitizers from working on powerpc64le.\n"
|
|
|
2024 "ASLR will be disabled and the program re-executed.\n");
|
|
|
2025 CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1);
|
|
|
2026 ReExec();
|
|
|
2027 }
|
|
|
2028 #elif SANITIZER_FREEBSD
|
|
|
2029 int aslr_pie;
|
|
|
2030 uptr len = sizeof(aslr_pie);
|
|
|
2031 #if SANITIZER_WORDSIZE == 64
|
|
|
2032 if (UNLIKELY(internal_sysctlbyname("kern.elf64.aslr.pie_enable",
|
|
|
2033 &aslr_pie, &len, NULL, 0) == -1)) {
|
|
|
2034 // We're making things less 'dramatic' here since
|
|
|
2035 // the OID is not necessarily guaranteed to be here
|
|
|
2036 // just yet regarding FreeBSD release
|
|
|
2037 return;
|
|
|
2038 }
|
|
|
2039
|
|
|
2040 if (aslr_pie > 0) {
|
|
|
2041 Printf("This sanitizer is not compatible with enabled ASLR "
|
|
|
2042 "and binaries compiled with PIE\n");
|
|
|
2043 Die();
|
|
|
2044 }
|
|
|
2045 #endif
|
|
|
2046 // there might be 32 bits compat for 64 bits
|
|
|
2047 if (UNLIKELY(internal_sysctlbyname("kern.elf32.aslr.pie_enable",
|
|
|
2048 &aslr_pie, &len, NULL, 0) == -1)) {
|
|
|
2049 return;
|
|
|
2050 }
|
|
|
2051
|
|
|
2052 if (aslr_pie > 0) {
|
|
|
2053 Printf("This sanitizer is not compatible with enabled ASLR "
|
|
|
2054 "and binaries compiled with PIE\n");
|
|
|
2055 Die();
|
|
|
2056 }
|
|
|
2057 #else
|
|
|
2058 // Do nothing
|
|
|
2059 #endif
|
|
|
2060 }
|
|
|
2061
|
|
|
2062 void CheckMPROTECT() {
|
|
|
2063 #if SANITIZER_NETBSD
|
|
|
2064 int mib[3];
|
|
|
2065 int paxflags;
|
|
|
2066 uptr len = sizeof(paxflags);
|
|
|
2067
|
|
|
2068 mib[0] = CTL_PROC;
|
|
|
2069 mib[1] = internal_getpid();
|
|
|
2070 mib[2] = PROC_PID_PAXFLAGS;
|
|
|
2071
|
|
|
2072 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) {
|
|
|
2073 Printf("sysctl failed\n");
|
|
|
2074 Die();
|
|
|
2075 }
|
|
|
2076
|
|
|
2077 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_MPROTECT)) {
|
|
|
2078 Printf("This sanitizer is not compatible with enabled MPROTECT\n");
|
|
|
2079 Die();
|
|
|
2080 }
|
|
|
2081 #else
|
|
|
2082 // Do nothing
|
|
|
2083 #endif
|
|
|
2084 }
|
|
|
2085
|
|
|
2086 void PrintModuleMap() { }
|
|
|
2087
|
|
|
2088 void CheckNoDeepBind(const char *filename, int flag) {
|
|
|
2089 #ifdef RTLD_DEEPBIND
|
|
|
2090 if (flag & RTLD_DEEPBIND) {
|
|
|
2091 Report(
|
|
|
2092 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag"
|
|
|
2093 " which is incompatibe with sanitizer runtime "
|
|
|
2094 "(see https://github.com/google/sanitizers/issues/611 for details"
|
|
|
2095 "). If you want to run %s library under sanitizers please remove "
|
|
|
2096 "RTLD_DEEPBIND from dlopen flags.\n",
|
|
|
2097 filename, filename);
|
|
|
2098 Die();
|
|
|
2099 }
|
|
|
2100 #endif
|
|
|
2101 }
|
|
|
2102
|
|
|
2103 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding,
|
|
|
2104 uptr *largest_gap_found,
|
|
|
2105 uptr *max_occupied_addr) {
|
|
|
2106 UNREACHABLE("FindAvailableMemoryRange is not available");
|
|
|
2107 return 0;
|
|
|
2108 }
|
|
|
2109
|
|
|
2110 bool GetRandom(void *buffer, uptr length, bool blocking) {
|
|
|
2111 if (!buffer || !length || length > 256)
|
|
|
2112 return false;
|
|
|
2113 #if SANITIZER_USE_GETENTROPY
|
|
|
2114 uptr rnd = getentropy(buffer, length);
|
|
|
2115 int rverrno = 0;
|
|
|
2116 if (internal_iserror(rnd, &rverrno) && rverrno == EFAULT)
|
|
|
2117 return false;
|
|
|
2118 else if (rnd == 0)
|
|
|
2119 return true;
|
|
|
2120 #endif // SANITIZER_USE_GETENTROPY
|
|
|
2121
|
|
|
2122 #if SANITIZER_USE_GETRANDOM
|
|
|
2123 static atomic_uint8_t skip_getrandom_syscall;
|
|
|
2124 if (!atomic_load_relaxed(&skip_getrandom_syscall)) {
|
|
|
2125 // Up to 256 bytes, getrandom will not be interrupted.
|
|
|
2126 uptr res = internal_syscall(SYSCALL(getrandom), buffer, length,
|
|
|
2127 blocking ? 0 : GRND_NONBLOCK);
|
|
|
2128 int rverrno = 0;
|
|
|
2129 if (internal_iserror(res, &rverrno) && rverrno == ENOSYS)
|
|
|
2130 atomic_store_relaxed(&skip_getrandom_syscall, 1);
|
|
|
2131 else if (res == length)
|
|
|
2132 return true;
|
|
|
2133 }
|
|
|
2134 #endif // SANITIZER_USE_GETRANDOM
|
|
|
2135 // Up to 256 bytes, a read off /dev/urandom will not be interrupted.
|
|
|
2136 // blocking is moot here, O_NONBLOCK has no effect when opening /dev/urandom.
|
|
|
2137 uptr fd = internal_open("/dev/urandom", O_RDONLY);
|
|
|
2138 if (internal_iserror(fd))
|
|
|
2139 return false;
|
|
|
2140 uptr res = internal_read(fd, buffer, length);
|
|
|
2141 if (internal_iserror(res))
|
|
|
2142 return false;
|
|
|
2143 internal_close(fd);
|
|
|
2144 return true;
|
|
|
2145 }
|
|
|
2146
|
|
|
2147 } // namespace __sanitizer
|
|
|
2148
|
|
|
2149 #endif
|
