1 //===-- sanitizer_procmaps.h ------------------------------------*- C++ -*-===// 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 // This file is shared between AddressSanitizer and ThreadSanitizer. 11 // 12 // Information about the process mappings. 13 //===----------------------------------------------------------------------===// 14 #ifndef SANITIZER_PROCMAPS_H 15 #define SANITIZER_PROCMAPS_H 16 17 #include "sanitizer_common.h" 18 #include "sanitizer_internal_defs.h" 19 #include "sanitizer_mutex.h" 20 21 namespace __sanitizer { 22 23 #if SANITIZER_FREEBSD || SANITIZER_LINUX 24 struct ProcSelfMapsBuff { 25 char *data; 26 uptr mmaped_size; 27 uptr len; 28 }; 29 30 // Reads process memory map in an OS-specific way. 31 void ReadProcMaps(ProcSelfMapsBuff *proc_maps); 32 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX 33 34 class MemoryMappingLayout { 35 public: 36 explicit MemoryMappingLayout(bool cache_enabled); 37 ~MemoryMappingLayout(); 38 bool Next(uptr *start, uptr *end, uptr *offset, 39 char filename[], uptr filename_size, uptr *protection); 40 void Reset(); 41 // In some cases, e.g. when running under a sandbox on Linux, ASan is unable 42 // to obtain the memory mappings. It should fall back to pre-cached data 43 // instead of aborting. 44 static void CacheMemoryMappings(); 45 46 // Stores the list of mapped objects into an array. 47 uptr DumpListOfModules(LoadedModule *modules, uptr max_modules, 48 string_predicate_t filter); 49 50 // Memory protection masks. 51 static const uptr kProtectionRead = 1; 52 static const uptr kProtectionWrite = 2; 53 static const uptr kProtectionExecute = 4; 54 static const uptr kProtectionShared = 8; 55 56 private: 57 void LoadFromCache(); 58 59 // FIXME: Hide implementation details for different platforms in 60 // platform-specific files. 61 # if SANITIZER_FREEBSD || SANITIZER_LINUX 62 ProcSelfMapsBuff proc_self_maps_; 63 const char *current_; 64 65 // Static mappings cache. 66 static ProcSelfMapsBuff cached_proc_self_maps_; 67 static StaticSpinMutex cache_lock_; // protects cached_proc_self_maps_. 68 # elif SANITIZER_MAC 69 template<u32 kLCSegment, typename SegmentCommand> 70 bool NextSegmentLoad(uptr *start, uptr *end, uptr *offset, 71 char filename[], uptr filename_size, 72 uptr *protection); 73 int current_image_; 74 u32 current_magic_; 75 u32 current_filetype_; 76 int current_load_cmd_count_; 77 char *current_load_cmd_addr_; 78 # endif 79 }; 80 81 typedef void (*fill_profile_f)(uptr start, uptr rss, bool file, 82 /*out*/uptr *stats, uptr stats_size); 83 84 // Parse the contents of /proc/self/smaps and generate a memory profile. 85 // |cb| is a tool-specific callback that fills the |stats| array containing 86 // |stats_size| elements. 87 void GetMemoryProfile(fill_profile_f cb, uptr *stats, uptr stats_size); 88 89 // Returns code range for the specified module. 90 bool GetCodeRangeForFile(const char *module, uptr *start, uptr *end); 91 92 bool IsDecimal(char c); 93 uptr ParseDecimal(const char **p); 94 bool IsHex(char c); 95 uptr ParseHex(const char **p); 96 97 } // namespace __sanitizer 98 99 #endif // SANITIZER_PROCMAPS_H 100