lib/sanitizer_common/sanitizer_posix.cc

   1 //===-- sanitizer_posix.cc ------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file is shared between AddressSanitizer and ThreadSanitizer
  11 // run-time libraries and implements POSIX-specific functions from
  12 // sanitizer_libc.h.
  13 //===----------------------------------------------------------------------===//
  14 #if defined(__linux__) || defined(__APPLE__)
  15
  16 #include "sanitizer_common.h"
  17 #include "sanitizer_libc.h"
  18 #include "sanitizer_procmaps.h"
  19
  20 #include <errno.h>
  21 #include <pthread.h>
  22 #include <stdarg.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/mman.h>
  27 #include <sys/resource.h>
  28 #include <sys/time.h>
  29 #include <sys/types.h>
  30 #include <unistd.h>
  31
  32 namespace __sanitizer {
  33
  34 // ------------- sanitizer_common.h
  35
  36 int GetPid() {
  37   return getpid();
  38 }
  39
  40 uptr GetThreadSelf() {
  41   return (uptr)pthread_self();
  42 }
  43
  44 void *MmapOrDie(uptr size, const char *mem_type) {
  45   size = RoundUpTo(size, kPageSize);
  46   void *res = internal_mmap(0, size,
  47                             PROT_READ | PROT_WRITE,
  48                             MAP_PRIVATE | MAP_ANON, -1, 0);
  49   if (res == (void*)-1) {
  50     static int recursion_count;
  51     if (recursion_count) {
  52       // The Report() and CHECK calls below may call mmap recursively and fail.
  53       // If we went into recursion, just die.
  54       RawWrite("AddressSanitizer is unable to mmap\n");
  55       Die();
  56     }
  57     recursion_count++;
  58     Report("ERROR: Failed to allocate 0x%zx (%zd) bytes of %s: %s\n",
  59            size, size, mem_type, strerror(errno));
  60     DumpProcessMap();
  61     CHECK("unable to mmap" && 0);
  62   }
  63   return res;
  64 }
  65
  66 void UnmapOrDie(void *addr, uptr size) {
  67   if (!addr || !size) return;
  68   int res = internal_munmap(addr, size);
  69   if (res != 0) {
  70     Report("ERROR: Failed to deallocate 0x%zx (%zd) bytes at address %p\n",
  71            size, size, addr);
  72     CHECK("unable to unmap" && 0);
  73   }
  74 }
  75
  76 void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
  77   void *p = internal_mmap((void*)fixed_addr, size,
  78                       PROT_READ | PROT_WRITE,
  79                       MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
  80                       -1, 0);
  81   if (p != (void*)fixed_addr)
  82     Report("ERROR: Failed to deallocate 0x%zx (%zd) bytes at address %p (%d)\n",
  83            size, size, fixed_addr, errno);
  84   return p;
  85 }
  86
  87 void *Mprotect(uptr fixed_addr, uptr size) {
  88   return internal_mmap((void*)fixed_addr, size,
  89                        PROT_NONE,
  90                        MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
  91                        -1, 0);
  92 }
  93
  94 void *MapFileToMemory(const char *file_name, uptr *buff_size) {
  95   fd_t fd = internal_open(file_name, false);
  96   CHECK_NE(fd, kInvalidFd);
  97   uptr fsize = internal_filesize(fd);
  98   CHECK_NE(fsize, (uptr)-1);
  99   CHECK_GT(fsize, 0);
 100   *buff_size = RoundUpTo(fsize, kPageSize);
 101   void *map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
 102   return (map == MAP_FAILED) ? 0 : map;
 103 }
 104
 105
 106 static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
 107                                         uptr start2, uptr end2) {
 108   CHECK(start1 <= end1);
 109   CHECK(start2 <= end2);
 110   return (end1 < start2) || (end2 < start1);
 111 }
 112
 113 // FIXME: this is thread-unsafe, but should not cause problems most of the time.
 114 // When the shadow is mapped only a single thread usually exists (plus maybe
 115 // several worker threads on Mac, which aren't expected to map big chunks of
 116 // memory).
 117 bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
 118   MemoryMappingLayout procmaps;
 119   uptr start, end;
 120   while (procmaps.Next(&start, &end,
 121                        /*offset*/0, /*filename*/0, /*filename_size*/0)) {
 122     if (!IntervalsAreSeparate(start, end, range_start, range_end))
 123       return false;
 124   }
 125   return true;
 126 }
 127
 128 void DumpProcessMap() {
 129   MemoryMappingLayout proc_maps;
 130   uptr start, end;
 131   const sptr kBufSize = 4095;
 132   char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
 133   Report("Process memory map follows:\n");
 134   while (proc_maps.Next(&start, &end, /* file_offset */0,
 135                         filename, kBufSize)) {
 136     Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
 137   }
 138   Report("End of process memory map.\n");
 139   UnmapOrDie(filename, kBufSize);
 140 }
 141
 142 const char *GetPwd() {
 143   return GetEnv("PWD");
 144 }
 145
 146 void DisableCoreDumper() {
 147   struct rlimit nocore;
 148   nocore.rlim_cur = 0;
 149   nocore.rlim_max = 0;
 150   setrlimit(RLIMIT_CORE, &nocore);
 151 }
 152
 153 bool StackSizeIsUnlimited() {
 154   struct rlimit rlim;
 155   CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
 156   return (rlim.rlim_cur == (uptr)-1);
 157 }
 158
 159 void SetStackSizeLimitInBytes(uptr limit) {
 160   struct rlimit rlim;
 161   rlim.rlim_cur = limit;
 162   rlim.rlim_max = limit;
 163   CHECK_EQ(0, setrlimit(RLIMIT_STACK, &rlim));
 164   CHECK(!StackSizeIsUnlimited());
 165 }
 166
 167 void SleepForSeconds(int seconds) {
 168   sleep(seconds);
 169 }
 170
 171 void SleepForMillis(int millis) {
 172   usleep(millis * 1000);
 173 }
 174
 175 void Exit(int exitcode) {
 176   _exit(exitcode);
 177 }
 178
 179 void Abort() {
 180   abort();
 181 }
 182
 183 int Atexit(void (*function)(void)) {
 184 #ifndef SANITIZER_GO
 185   return atexit(function);
 186 #else
 187   return 0;
 188 #endif
 189 }
 190
 191 int internal_isatty(fd_t fd) {
 192   return isatty(fd);
 193 }
 194
 195 }  // namespace __sanitizer
 196
 197 #endif  // __linux__ || __APPLE_