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 18namespace __sanitizer { 19 20void ReadProcMaps(ProcSelfMapsBuff *proc_maps) { 21 if (!ReadFileToBuffer("/proc/self/maps", &proc_maps->data, 22 &proc_maps->mmaped_size, &proc_maps->len)) { 23 proc_maps->data = nullptr; 24 proc_maps->mmaped_size = 0; 25 proc_maps->len = 0; 26 } 27} 28 29static bool IsOneOf(char c, char c1, char c2) { 30 return c == c1 || c == c2; 31} 32 33bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) { 34 if (Error()) return false; // simulate empty maps 35 char *last = data_.proc_self_maps.data + data_.proc_self_maps.len; 36 if (data_.current >= last) return false; 37 char *next_line = 38 (char *)internal_memchr(data_.current, '\n', last - data_.current); 39 if (next_line == 0) 40 next_line = last; 41 // Example: 08048000-08056000 r-xp 00000000 03:0c 64593 /foo/bar 42 segment->start = ParseHex(&data_.current); 43 CHECK_EQ(*data_.current++, '-'); 44 segment->end = ParseHex(&data_.current); 45 CHECK_EQ(*data_.current++, ' '); 46 CHECK(IsOneOf(*data_.current, '-', 'r')); 47 segment->protection = 0; 48 if (*data_.current++ == 'r') segment->protection |= kProtectionRead; 49 CHECK(IsOneOf(*data_.current, '-', 'w')); 50 if (*data_.current++ == 'w') segment->protection |= kProtectionWrite; 51 CHECK(IsOneOf(*data_.current, '-', 'x')); 52 if (*data_.current++ == 'x') segment->protection |= kProtectionExecute; 53 CHECK(IsOneOf(*data_.current, 's', 'p')); 54 if (*data_.current++ == 's') segment->protection |= kProtectionShared; 55 CHECK_EQ(*data_.current++, ' '); 56 segment->offset = ParseHex(&data_.current); 57 CHECK_EQ(*data_.current++, ' '); 58 ParseHex(&data_.current); 59 CHECK_EQ(*data_.current++, ':'); 60 ParseHex(&data_.current); 61 CHECK_EQ(*data_.current++, ' '); 62 while (IsDecimal(*data_.current)) data_.current++; 63 // Qemu may lack the trailing space. 64 // https://github.com/google/sanitizers/issues/160 65 // CHECK_EQ(*data_.current++, ' '); 66 // Skip spaces. 67 while (data_.current < next_line && *data_.current == ' ') data_.current++; 68 // Fill in the filename. 69 if (segment->filename) { 70 uptr len = 71 Min((uptr)(next_line - data_.current), segment->filename_size - 1); 72 internal_strncpy(segment->filename, data_.current, len); 73 segment->filename[len] = 0; 74 } 75 76 data_.current = next_line + 1; 77 return true; 78} 79 80} // namespace __sanitizer 81 82#endif // SANITIZER_LINUX 83