src/libcompiler_builtins/compiler-rt/lib/sanitizer_common/sanitizer_procmaps_linux.cc

   1 //===-- sanitizer_procmaps_linux.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 // Information about the process mappings (Linux-specific parts).
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "sanitizer_platform.h"
  14 #if SANITIZER_LINUX
  15 #include "sanitizer_common.h"
  16 #include "sanitizer_procmaps.h"
  17
  18 namespace __sanitizer {
  19
  20 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
  21   CHECK(ReadFileToBuffer("/proc/self/maps", &proc_maps->data,
  22                          &proc_maps->mmaped_size, &proc_maps->len));
  23 }
  24
  25 static bool IsOneOf(char c, char c1, char c2) {
  26   return c == c1 || c == c2;
  27 }
  28
  29 bool MemoryMappingLayout::Next(uptr *start, uptr *end, uptr *offset,
  30                                char filename[], uptr filename_size,
  31                                uptr *protection, ModuleArch *arch, u8 *uuid) {
  32   CHECK(!arch && "not implemented");
  33   CHECK(!uuid && "not implemented");
  34   char *last = proc_self_maps_.data + proc_self_maps_.len;
  35   if (current_ >= last) return false;
  36   uptr dummy;
  37   if (!start) start = &dummy;
  38   if (!end) end = &dummy;
  39   if (!offset) offset = &dummy;
  40   if (!protection) protection = &dummy;
  41   char *next_line = (char*)internal_memchr(current_, '\n', last - current_);
  42   if (next_line == 0)
  43     next_line = last;
  44   // Example: 08048000-08056000 r-xp 00000000 03:0c 64593   /foo/bar
  45   *start = ParseHex(&current_);
  46   CHECK_EQ(*current_++, '-');
  47   *end = ParseHex(&current_);
  48   CHECK_EQ(*current_++, ' ');
  49   CHECK(IsOneOf(*current_, '-', 'r'));
  50   *protection = 0;
  51   if (*current_++ == 'r')
  52     *protection |= kProtectionRead;
  53   CHECK(IsOneOf(*current_, '-', 'w'));
  54   if (*current_++ == 'w')
  55     *protection |= kProtectionWrite;
  56   CHECK(IsOneOf(*current_, '-', 'x'));
  57   if (*current_++ == 'x')
  58     *protection |= kProtectionExecute;
  59   CHECK(IsOneOf(*current_, 's', 'p'));
  60   if (*current_++ == 's')
  61     *protection |= kProtectionShared;
  62   CHECK_EQ(*current_++, ' ');
  63   *offset = ParseHex(&current_);
  64   CHECK_EQ(*current_++, ' ');
  65   ParseHex(&current_);
  66   CHECK_EQ(*current_++, ':');
  67   ParseHex(&current_);
  68   CHECK_EQ(*current_++, ' ');
  69   while (IsDecimal(*current_))
  70     current_++;
  71   // Qemu may lack the trailing space.
  72   // https://github.com/google/sanitizers/issues/160
  73   // CHECK_EQ(*current_++, ' ');
  74   // Skip spaces.
  75   while (current_ < next_line && *current_ == ' ')
  76     current_++;
  77   // Fill in the filename.
  78   uptr i = 0;
  79   while (current_ < next_line) {
  80     if (filename && i < filename_size - 1)
  81       filename[i++] = *current_;
  82     current_++;
  83   }
  84   if (filename && i < filename_size)
  85     filename[i] = 0;
  86   current_ = next_line + 1;
  87   return true;
  88 }
  89
  90 }  // namespace __sanitizer
  91
  92 #endif  // SANITIZER_LINUX