1//===-- sanitizer_procmaps_linux.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// Information about the process mappings (Linux-specific parts). 9//===----------------------------------------------------------------------===// 10 11#include "sanitizer_platform.h" 12#if SANITIZER_LINUX 13#include "sanitizer_common.h" 14#include "sanitizer_procmaps.h" 15 16namespace __sanitizer { 17 18void ReadProcMaps(ProcSelfMapsBuff *proc_maps) { 19 if (!ReadFileToBuffer("/proc/self/maps", &proc_maps->data, 20 &proc_maps->mmaped_size, &proc_maps->len)) { 21 proc_maps->data = nullptr; 22 proc_maps->mmaped_size = 0; 23 proc_maps->len = 0; 24 } 25} 26 27static bool IsOneOf(char c, char c1, char c2) { 28 return c == c1 || c == c2; 29} 30 31bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) { 32 char *last = data_.proc_self_maps.data + data_.proc_self_maps.len; 33 if (data_.current >= last) return false; 34 char *next_line = 35 (char *)internal_memchr(data_.current, '\n', last - data_.current); 36 if (next_line == 0) 37 next_line = last; 38 // Example: 08048000-08056000 r-xp 00000000 03:0c 64593 /foo/bar 39 segment->start = ParseHex(&data_.current); 40 CHECK_EQ(*data_.current++, '-'); 41 segment->end = ParseHex(&data_.current); 42 CHECK_EQ(*data_.current++, ' '); 43 CHECK(IsOneOf(*data_.current, '-', 'r')); 44 segment->protection = 0; 45 if (*data_.current++ == 'r') segment->protection |= kProtectionRead; 46 CHECK(IsOneOf(*data_.current, '-', 'w')); 47 if (*data_.current++ == 'w') segment->protection |= kProtectionWrite; 48 CHECK(IsOneOf(*data_.current, '-', 'x')); 49 if (*data_.current++ == 'x') segment->protection |= kProtectionExecute; 50 CHECK(IsOneOf(*data_.current, 's', 'p')); 51 if (*data_.current++ == 's') segment->protection |= kProtectionShared; 52 CHECK_EQ(*data_.current++, ' '); 53 segment->offset = ParseHex(&data_.current); 54 CHECK_EQ(*data_.current++, ' '); 55 ParseHex(&data_.current); 56 CHECK_EQ(*data_.current++, ':'); 57 ParseHex(&data_.current); 58 CHECK_EQ(*data_.current++, ' '); 59 while (IsDecimal(*data_.current)) data_.current++; 60 // Qemu may lack the trailing space. 61 // https://github.com/google/sanitizers/issues/160 62 // CHECK_EQ(*data_.current++, ' '); 63 // Skip spaces. 64 while (data_.current < next_line && *data_.current == ' ') data_.current++; 65 // Fill in the filename. 66 if (segment->filename) { 67 uptr len = 68 Min((uptr)(next_line - data_.current), segment->filename_size - 1); 69 internal_strncpy(segment->filename, data_.current, len); 70 segment->filename[len] = 0; 71 } 72 73 data_.current = next_line + 1; 74 return true; 75} 76 77} // namespace __sanitizer 78 79#endif // SANITIZER_LINUX 80