libsanitizer/sanitizer_common/sanitizer_posix.cc

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