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 uptr GetPageSize() {
  34   return sysconf(_SC_PAGESIZE);
  35 }
  36
  37 uptr GetMmapGranularity() {
  38   return GetPageSize();
  39 }
  40
  41 int GetPid() {
  42   return getpid();
  43 }
  44
  45 uptr GetThreadSelf() {
  46   return (uptr)pthread_self();
  47 }
  48
  49 void *MmapOrDie(uptr size, const char *mem_type) {
  50   size = RoundUpTo(size, GetPageSizeCached());
  51   void *res = internal_mmap(0, size,
  52                             PROT_READ | PROT_WRITE,
  53                             MAP_PRIVATE | MAP_ANON, -1, 0);
  54   if (res == (void*)-1) {
  55     static int recursion_count;
  56     if (recursion_count) {
  57       // The Report() and CHECK calls below may call mmap recursively and fail.
  58       // If we went into recursion, just die.
  59       RawWrite("AddressSanitizer is unable to mmap\n");
  60       Die();
  61     }
  62     recursion_count++;
  63     Report("ERROR: Failed to allocate 0x%zx (%zd) bytes of %s: %s\n",
  64            size, size, mem_type, strerror(errno));
  65     DumpProcessMap();
  66     CHECK("unable to mmap" && 0);
  67   }
  68   return res;
  69 }
  70
  71 void UnmapOrDie(void *addr, uptr size) {
  72   if (!addr || !size) return;
  73   int res = internal_munmap(addr, size);
  74   if (res != 0) {
  75     Report("ERROR: Failed to deallocate 0x%zx (%zd) bytes at address %p\n",
  76            size, size, addr);
  77     CHECK("unable to unmap" && 0);
  78   }
  79 }
  80
  81 void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
  82   uptr PageSize = GetPageSizeCached();
  83   void *p = internal_mmap((void*)(fixed_addr & ~(PageSize - 1)),
  84       RoundUpTo(size, PageSize),
  85       PROT_READ | PROT_WRITE,
  86       MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
  87       -1, 0);
  88   if (p == (void*)-1)
  89     Report("ERROR: Failed to allocate 0x%zx (%zd) bytes at address %p (%d)\n",
  90            size, size, fixed_addr, errno);
  91   return p;
  92 }
  93
  94 void *Mprotect(uptr fixed_addr, uptr size) {
  95   return internal_mmap((void*)fixed_addr, size,
  96                        PROT_NONE,
  97                        MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
  98                        -1, 0);
  99 }
 100
 101 void *MapFileToMemory(const char *file_name, uptr *buff_size) {
 102   fd_t fd = internal_open(file_name, false);
 103   CHECK_NE(fd, kInvalidFd);
 104   uptr fsize = internal_filesize(fd);
 105   CHECK_NE(fsize, (uptr)-1);
 106   CHECK_GT(fsize, 0);
 107   *buff_size = RoundUpTo(fsize, GetPageSizeCached());
 108   void *map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
 109   return (map == MAP_FAILED) ? 0 : map;
 110 }
 111
 112
 113 static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
 114                                         uptr start2, uptr end2) {
 115   CHECK(start1 <= end1);
 116   CHECK(start2 <= end2);
 117   return (end1 < start2) || (end2 < start1);
 118 }
 119
 120 // FIXME: this is thread-unsafe, but should not cause problems most of the time.
 121 // When the shadow is mapped only a single thread usually exists (plus maybe
 122 // several worker threads on Mac, which aren't expected to map big chunks of
 123 // memory).
 124 bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
 125   MemoryMappingLayout procmaps;
 126   uptr start, end;
 127   while (procmaps.Next(&start, &end,
 128                        /*offset*/0, /*filename*/0, /*filename_size*/0)) {
 129     if (!IntervalsAreSeparate(start, end, range_start, range_end))
 130       return false;
 131   }
 132   return true;
 133 }
 134
 135 void DumpProcessMap() {
 136   MemoryMappingLayout proc_maps;
 137   uptr start, end;
 138   const sptr kBufSize = 4095;
 139   char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
 140   Report("Process memory map follows:\n");
 141   while (proc_maps.Next(&start, &end, /* file_offset */0,
 142                         filename, kBufSize)) {
 143     Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
 144   }
 145   Report("End of process memory map.\n");
 146   UnmapOrDie(filename, kBufSize);
 147 }
 148
 149 const char *GetPwd() {
 150   return GetEnv("PWD");
 151 }
 152
 153 void DisableCoreDumper() {
 154   struct rlimit nocore;
 155   nocore.rlim_cur = 0;
 156   nocore.rlim_max = 0;
 157   setrlimit(RLIMIT_CORE, &nocore);
 158 }
 159
 160 bool StackSizeIsUnlimited() {
 161   struct rlimit rlim;
 162   CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
 163   return (rlim.rlim_cur == (uptr)-1);
 164 }
 165
 166 void SetStackSizeLimitInBytes(uptr limit) {
 167   struct rlimit rlim;
 168   rlim.rlim_cur = limit;
 169   rlim.rlim_max = limit;
 170   if (setrlimit(RLIMIT_STACK, &rlim)) {
 171     Report("setrlimit() failed %d\n", errno);
 172     Die();
 173   }
 174   CHECK(!StackSizeIsUnlimited());
 175 }
 176
 177 void SleepForSeconds(int seconds) {
 178   sleep(seconds);
 179 }
 180
 181 void SleepForMillis(int millis) {
 182   usleep(millis * 1000);
 183 }
 184
 185 void Exit(int exitcode) {
 186   _exit(exitcode);
 187 }
 188
 189 void Abort() {
 190   abort();
 191 }
 192
 193 int Atexit(void (*function)(void)) {
 194 #ifndef SANITIZER_GO
 195   return atexit(function);
 196 #else
 197   return 0;
 198 #endif
 199 }
 200
 201 int internal_isatty(fd_t fd) {
 202   return isatty(fd);
 203 }
 204
 205 }  // namespace __sanitizer
 206
 207 #endif  // __linux__ || __APPLE_