1 //===-- sanitizer_procmaps.h ------------------------------------*- C++ -*-===// 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 // 10 // Information about the process mappings. 11 //===----------------------------------------------------------------------===// 12 #ifndef SANITIZER_PROCMAPS_H 13 #define SANITIZER_PROCMAPS_H 14 15 #include "sanitizer_common.h" 16 #include "sanitizer_internal_defs.h" 17 #include "sanitizer_mutex.h" 18 19 namespace __sanitizer { 20 21 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD 22 struct ProcSelfMapsBuff { 23 char *data; 24 uptr mmaped_size; 25 uptr len; 26 }; 27 28 // Reads process memory map in an OS-specific way. 29 void ReadProcMaps(ProcSelfMapsBuff *proc_maps); 30 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD 31 32 class MemoryMappingLayout { 33 public: 34 explicit MemoryMappingLayout(bool cache_enabled); 35 ~MemoryMappingLayout(); 36 bool Next(uptr *start, uptr *end, uptr *offset, 37 char filename[], uptr filename_size, uptr *protection); 38 void Reset(); 39 // In some cases, e.g. when running under a sandbox on Linux, ASan is unable 40 // to obtain the memory mappings. It should fall back to pre-cached data 41 // instead of aborting. 42 static void CacheMemoryMappings(); 43 44 // Stores the list of mapped objects into an array. 45 uptr DumpListOfModules(LoadedModule *modules, uptr max_modules, 46 string_predicate_t filter); 47 48 // Memory protection masks. 49 static const uptr kProtectionRead = 1; 50 static const uptr kProtectionWrite = 2; 51 static const uptr kProtectionExecute = 4; 52 static const uptr kProtectionShared = 8; 53 54 private: 55 void LoadFromCache(); 56 57 // FIXME: Hide implementation details for different platforms in 58 // platform-specific files. 59 # if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD 60 ProcSelfMapsBuff proc_self_maps_; 61 const char *current_; 62 63 // Static mappings cache. 64 static ProcSelfMapsBuff cached_proc_self_maps_; 65 static StaticSpinMutex cache_lock_; // protects cached_proc_self_maps_. 66 # elif SANITIZER_MAC 67 template<u32 kLCSegment, typename SegmentCommand> 68 bool NextSegmentLoad(uptr *start, uptr *end, uptr *offset, 69 char filename[], uptr filename_size, 70 uptr *protection); 71 int current_image_; 72 u32 current_magic_; 73 u32 current_filetype_; 74 int current_load_cmd_count_; 75 char *current_load_cmd_addr_; 76 # endif 77 }; 78 79 typedef void (*fill_profile_f)(uptr start, uptr rss, bool file, 80 /*out*/uptr *stats, uptr stats_size); 81 82 // Parse the contents of /proc/self/smaps and generate a memory profile. 83 // |cb| is a tool-specific callback that fills the |stats| array containing 84 // |stats_size| elements. 85 void GetMemoryProfile(fill_profile_f cb, uptr *stats, uptr stats_size); 86 87 // Returns code range for the specified module. 88 bool GetCodeRangeForFile(const char *module, uptr *start, uptr *end); 89 90 bool IsDecimal(char c); 91 uptr ParseDecimal(const char **p); 92 bool IsHex(char c); 93 uptr ParseHex(const char **p); 94 95 } // namespace __sanitizer 96 97 #endif // SANITIZER_PROCMAPS_H 98