1 //===-- asan_allocator.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 a part of AddressSanitizer, an address sanity checker. 11 // 12 // ASan-private header for asan_allocator.cc. 13 //===----------------------------------------------------------------------===// 14 15 #ifndef ASAN_ALLOCATOR_H 16 #define ASAN_ALLOCATOR_H 17 18 #include "asan_flags.h" 19 #include "asan_internal.h" 20 #include "asan_interceptors.h" 21 #include "sanitizer_common/sanitizer_allocator.h" 22 #include "sanitizer_common/sanitizer_list.h" 23 24 namespace __asan { 25 26 enum AllocType { 27 FROM_MALLOC = 1, // Memory block came from malloc, calloc, realloc, etc. 28 FROM_NEW = 2, // Memory block came from operator new. 29 FROM_NEW_BR = 3 // Memory block came from operator new [ ] 30 }; 31 32 struct AsanChunk; 33 34 struct AllocatorOptions { 35 u32 quarantine_size_mb; 36 u16 min_redzone; 37 u16 max_redzone; 38 u8 may_return_null; 39 u8 alloc_dealloc_mismatch; 40 41 void SetFrom(const Flags *f, const CommonFlags *cf); 42 void CopyTo(Flags *f, CommonFlags *cf); 43 }; 44 45 void InitializeAllocator(const AllocatorOptions &options); 46 void ReInitializeAllocator(const AllocatorOptions &options); 47 void GetAllocatorOptions(AllocatorOptions *options); 48 49 class AsanChunkView { 50 public: 51 explicit AsanChunkView(AsanChunk *chunk) : chunk_(chunk) {} 52 bool IsValid(); // Checks if AsanChunkView points to a valid allocated 53 // or quarantined chunk. 54 bool IsAllocated(); // Checks if the memory is currently allocated. 55 uptr Beg(); // First byte of user memory. 56 uptr End(); // Last byte of user memory. 57 uptr UsedSize(); // Size requested by the user. 58 uptr AllocTid(); 59 uptr FreeTid(); 60 bool Eq(const AsanChunkView &c) const { return chunk_ == c.chunk_; } 61 u32 GetAllocStackId(); 62 u32 GetFreeStackId(); 63 StackTrace GetAllocStack(); 64 StackTrace GetFreeStack(); 65 bool AddrIsInside(uptr addr, uptr access_size, sptr *offset) { 66 if (addr >= Beg() && (addr + access_size) <= End()) { 67 *offset = addr - Beg(); 68 return true; 69 } 70 return false; 71 } 72 bool AddrIsAtLeft(uptr addr, uptr access_size, sptr *offset) { 73 (void)access_size; 74 if (addr < Beg()) { 75 *offset = Beg() - addr; 76 return true; 77 } 78 return false; 79 } 80 bool AddrIsAtRight(uptr addr, uptr access_size, sptr *offset) { 81 if (addr + access_size > End()) { 82 *offset = addr - End(); 83 return true; 84 } 85 return false; 86 } 87 88 private: 89 AsanChunk *const chunk_; 90 }; 91 92 AsanChunkView FindHeapChunkByAddress(uptr address); 93 94 // List of AsanChunks with total size. 95 class AsanChunkFifoList: public IntrusiveList<AsanChunk> { 96 public: 97 explicit AsanChunkFifoList(LinkerInitialized) { } 98 AsanChunkFifoList() { clear(); } 99 void Push(AsanChunk *n); 100 void PushList(AsanChunkFifoList *q); 101 AsanChunk *Pop(); 102 uptr size() { return size_; } 103 void clear() { 104 IntrusiveList<AsanChunk>::clear(); 105 size_ = 0; 106 } 107 private: 108 uptr size_; 109 }; 110 111 struct AsanMapUnmapCallback { 112 void OnMap(uptr p, uptr size) const; 113 void OnUnmap(uptr p, uptr size) const; 114 }; 115 116 #if SANITIZER_CAN_USE_ALLOCATOR64 117 # if defined(__powerpc64__) 118 const uptr kAllocatorSpace = 0xa0000000000ULL; 119 const uptr kAllocatorSize = 0x20000000000ULL; // 2T. 120 # elif defined(__aarch64__) 121 // AArch64/SANITIZIER_CAN_USER_ALLOCATOR64 is only for 42-bit VMA 122 // so no need to different values for different VMA. 123 const uptr kAllocatorSpace = 0x10000000000ULL; 124 const uptr kAllocatorSize = 0x10000000000ULL; // 3T. 125 # else 126 const uptr kAllocatorSpace = 0x600000000000ULL; 127 const uptr kAllocatorSize = 0x40000000000ULL; // 4T. 128 # endif 129 typedef DefaultSizeClassMap SizeClassMap; 130 typedef SizeClassAllocator64<kAllocatorSpace, kAllocatorSize, 0 /*metadata*/, 131 SizeClassMap, AsanMapUnmapCallback> PrimaryAllocator; 132 #else // Fallback to SizeClassAllocator32. 133 static const uptr kRegionSizeLog = 20; 134 static const uptr kNumRegions = SANITIZER_MMAP_RANGE_SIZE >> kRegionSizeLog; 135 # if SANITIZER_WORDSIZE == 32 136 typedef FlatByteMap<kNumRegions> ByteMap; 137 # elif SANITIZER_WORDSIZE == 64 138 typedef TwoLevelByteMap<(kNumRegions >> 12), 1 << 12> ByteMap; 139 # endif 140 typedef CompactSizeClassMap SizeClassMap; 141 typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE, 16, 142 SizeClassMap, kRegionSizeLog, 143 ByteMap, 144 AsanMapUnmapCallback> PrimaryAllocator; 145 #endif // SANITIZER_CAN_USE_ALLOCATOR64 146 147 static const uptr kNumberOfSizeClasses = SizeClassMap::kNumClasses; 148 typedef SizeClassAllocatorLocalCache<PrimaryAllocator> AllocatorCache; 149 typedef LargeMmapAllocator<AsanMapUnmapCallback> SecondaryAllocator; 150 typedef CombinedAllocator<PrimaryAllocator, AllocatorCache, 151 SecondaryAllocator> AsanAllocator; 152 153 154 struct AsanThreadLocalMallocStorage { 155 uptr quarantine_cache[16]; 156 AllocatorCache allocator_cache; 157 void CommitBack(); 158 private: 159 // These objects are allocated via mmap() and are zero-initialized. 160 AsanThreadLocalMallocStorage() {} 161 }; 162 163 void *asan_memalign(uptr alignment, uptr size, BufferedStackTrace *stack, 164 AllocType alloc_type); 165 void asan_free(void *ptr, BufferedStackTrace *stack, AllocType alloc_type); 166 void asan_sized_free(void *ptr, uptr size, BufferedStackTrace *stack, 167 AllocType alloc_type); 168 169 void *asan_malloc(uptr size, BufferedStackTrace *stack); 170 void *asan_calloc(uptr nmemb, uptr size, BufferedStackTrace *stack); 171 void *asan_realloc(void *p, uptr size, BufferedStackTrace *stack); 172 void *asan_valloc(uptr size, BufferedStackTrace *stack); 173 void *asan_pvalloc(uptr size, BufferedStackTrace *stack); 174 175 int asan_posix_memalign(void **memptr, uptr alignment, uptr size, 176 BufferedStackTrace *stack); 177 uptr asan_malloc_usable_size(const void *ptr, uptr pc, uptr bp); 178 179 uptr asan_mz_size(const void *ptr); 180 void asan_mz_force_lock(); 181 void asan_mz_force_unlock(); 182 183 void PrintInternalAllocatorStats(); 184 void AsanSoftRssLimitExceededCallback(bool exceeded); 185 186 } // namespace __asan 187 #endif // ASAN_ALLOCATOR_H 188
