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 uptr GetPageSize() {
  36   return sysconf(_SC_PAGESIZE);
  37 }
  38
  39 uptr GetMmapGranularity() {
  40   return GetPageSize();
  41 }
  42
  43 int GetPid() {
  44   return getpid();
  45 }
  46
  47 uptr GetThreadSelf() {
  48   return (uptr)pthread_self();
  49 }
  50
  51 void *MmapOrDie(uptr size, const char *mem_type) {
  52   size = RoundUpTo(size, GetPageSizeCached());
  53   void *res = internal_mmap(0, size,
  54                             PROT_READ | PROT_WRITE,
  55                             MAP_PRIVATE | MAP_ANON, -1, 0);
  56   if (res == (void*)-1) {
  57     static int recursion_count;
  58     if (recursion_count) {
  59       // The Report() and CHECK calls below may call mmap recursively and fail.
  60       // If we went into recursion, just die.
  61       RawWrite("ERROR: Failed to mmap\n");
  62       Die();
  63     }
  64     recursion_count++;
  65     Report("ERROR: %s failed to allocate 0x%zx (%zd) bytes of %s: %s\n",
  66            SanitizerToolName, size, size, mem_type, strerror(errno));
  67     DumpProcessMap();
  68     CHECK("unable to mmap" && 0);
  69   }
  70   return res;
  71 }
  72
  73 void UnmapOrDie(void *addr, uptr size) {
  74   if (!addr || !size) return;
  75   int res = internal_munmap(addr, size);
  76   if (res != 0) {
  77     Report("ERROR: %s failed to deallocate 0x%zx (%zd) bytes at address %p\n",
  78            SanitizerToolName, size, size, addr);
  79     CHECK("unable to unmap" && 0);
  80   }
  81 }
  82
  83 void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
  84   uptr PageSize = GetPageSizeCached();
  85   void *p = internal_mmap((void*)(fixed_addr & ~(PageSize - 1)),
  86       RoundUpTo(size, PageSize),
  87       PROT_READ | PROT_WRITE,
  88       MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
  89       -1, 0);
  90   if (p == (void*)-1)
  91     Report("ERROR: "
  92            "%s failed to allocate 0x%zx (%zd) bytes at address %p (%d)\n",
  93            SanitizerToolName, size, size, fixed_addr, errno);
  94   return p;
  95 }
  96
  97 void *MmapFixedOrDie(uptr fixed_addr, uptr size) {
  98   uptr PageSize = GetPageSizeCached();
  99   void *p = internal_mmap((void*)(fixed_addr & ~(PageSize - 1)),
 100       RoundUpTo(size, PageSize),
 101       PROT_READ | PROT_WRITE,
 102       MAP_PRIVATE | MAP_ANON | MAP_FIXED,
 103       -1, 0);
 104   if (p == (void*)-1) {
 105     Report("ERROR:"
 106            " %s failed to allocate 0x%zx (%zd) bytes at address %p (%d)\n",
 107            SanitizerToolName, size, size, fixed_addr, errno);
 108     CHECK("unable to mmap" && 0);
 109   }
 110   return p;
 111 }
 112
 113 void *Mprotect(uptr fixed_addr, uptr size) {
 114   return internal_mmap((void*)fixed_addr, size,
 115                        PROT_NONE,
 116                        MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
 117                        -1, 0);
 118 }
 119
 120 void FlushUnneededShadowMemory(uptr addr, uptr size) {
 121   madvise((void*)addr, size, MADV_DONTNEED);
 122 }
 123
 124 void *MapFileToMemory(const char *file_name, uptr *buff_size) {
 125   fd_t fd = OpenFile(file_name, false);
 126   CHECK_NE(fd, kInvalidFd);
 127   uptr fsize = internal_filesize(fd);
 128   CHECK_NE(fsize, (uptr)-1);
 129   CHECK_GT(fsize, 0);
 130   *buff_size = RoundUpTo(fsize, GetPageSizeCached());
 131   void *map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
 132   return (map == MAP_FAILED) ? 0 : map;
 133 }
 134
 135
 136 static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
 137                                         uptr start2, uptr end2) {
 138   CHECK(start1 <= end1);
 139   CHECK(start2 <= end2);
 140   return (end1 < start2) || (end2 < start1);
 141 }
 142
 143 // FIXME: this is thread-unsafe, but should not cause problems most of the time.
 144 // When the shadow is mapped only a single thread usually exists (plus maybe
 145 // several worker threads on Mac, which aren't expected to map big chunks of
 146 // memory).
 147 bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
 148   MemoryMappingLayout procmaps;
 149   uptr start, end;
 150   while (procmaps.Next(&start, &end,
 151                        /*offset*/0, /*filename*/0, /*filename_size*/0)) {
 152     if (!IntervalsAreSeparate(start, end, range_start, range_end))
 153       return false;
 154   }
 155   return true;
 156 }
 157
 158 void DumpProcessMap() {
 159   MemoryMappingLayout proc_maps;
 160   uptr start, end;
 161   const sptr kBufSize = 4095;
 162   char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
 163   Report("Process memory map follows:\n");
 164   while (proc_maps.Next(&start, &end, /* file_offset */0,
 165                         filename, kBufSize)) {
 166     Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
 167   }
 168   Report("End of process memory map.\n");
 169   UnmapOrDie(filename, kBufSize);
 170 }
 171
 172 const char *GetPwd() {
 173   return GetEnv("PWD");
 174 }
 175
 176 void DisableCoreDumper() {
 177   struct rlimit nocore;
 178   nocore.rlim_cur = 0;
 179   nocore.rlim_max = 0;
 180   setrlimit(RLIMIT_CORE, &nocore);
 181 }
 182
 183 bool StackSizeIsUnlimited() {
 184   struct rlimit rlim;
 185   CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
 186   return (rlim.rlim_cur == (uptr)-1);
 187 }
 188
 189 void SetStackSizeLimitInBytes(uptr limit) {
 190   struct rlimit rlim;
 191   rlim.rlim_cur = limit;
 192   rlim.rlim_max = limit;
 193   if (setrlimit(RLIMIT_STACK, &rlim)) {
 194     Report("ERROR: %s setrlimit() failed %d\n", SanitizerToolName, errno);
 195     Die();
 196   }
 197   CHECK(!StackSizeIsUnlimited());
 198 }
 199
 200 void SleepForSeconds(int seconds) {
 201   sleep(seconds);
 202 }
 203
 204 void SleepForMillis(int millis) {
 205   usleep(millis * 1000);
 206 }
 207
 208 void Exit(int exitcode) {
 209   _exit(exitcode);
 210 }
 211
 212 void Abort() {
 213   abort();
 214 }
 215
 216 int Atexit(void (*function)(void)) {
 217 #ifndef SANITIZER_GO
 218   return atexit(function);
 219 #else
 220   return 0;
 221 #endif
 222 }
 223
 224 int internal_isatty(fd_t fd) {
 225   return isatty(fd);
 226 }
 227
 228 }  // namespace __sanitizer
 229
 230 #endif  // __linux__ || __APPLE_