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