1 //===-- hwasan_mapping.h ----------------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 /// 9 /// \file 10 /// This file is a part of HWAddressSanitizer and defines memory mapping. 11 /// 12 //===----------------------------------------------------------------------===// 13 14 #ifndef HWASAN_MAPPING_H 15 #define HWASAN_MAPPING_H 16 17 #include "sanitizer_common/sanitizer_internal_defs.h" 18 #include "hwasan_interface_internal.h" 19 20 // Typical mapping on Linux/x86_64: 21 // with dynamic shadow mapped at [0x770d59f40000, 0x7f0d59f40000]: 22 // || [0x7f0d59f40000, 0x7fffffffffff] || HighMem || 23 // || [0x7efe2f934000, 0x7f0d59f3ffff] || HighShadow || 24 // || [0x7e7e2f934000, 0x7efe2f933fff] || ShadowGap || 25 // || [0x770d59f40000, 0x7e7e2f933fff] || LowShadow || 26 // || [0x000000000000, 0x770d59f3ffff] || LowMem || 27 28 // Typical mapping on Android/AArch64 29 // with dynamic shadow mapped: [0x007477480000, 0x007c77480000]: 30 // || [0x007c77480000, 0x007fffffffff] || HighMem || 31 // || [0x007c3ebc8000, 0x007c7747ffff] || HighShadow || 32 // || [0x007bbebc8000, 0x007c3ebc7fff] || ShadowGap || 33 // || [0x007477480000, 0x007bbebc7fff] || LowShadow || 34 // || [0x000000000000, 0x00747747ffff] || LowMem || 35 36 // Reasonable values are 4 (for 1/16th shadow) and 6 (for 1/64th). 37 constexpr uptr kShadowScale = 4; 38 constexpr uptr kShadowAlignment = 1ULL << kShadowScale; 39 40 namespace __hwasan { 41 42 extern uptr kLowMemStart; 43 extern uptr kLowMemEnd; 44 extern uptr kLowShadowEnd; 45 extern uptr kLowShadowStart; 46 extern uptr kHighShadowStart; 47 extern uptr kHighShadowEnd; 48 extern uptr kHighMemStart; 49 extern uptr kHighMemEnd; 50 51 inline uptr GetShadowOffset() { 52 return SANITIZER_FUCHSIA ? 0 : __hwasan_shadow_memory_dynamic_address; 53 } 54 inline uptr MemToShadow(uptr untagged_addr) { 55 return (untagged_addr >> kShadowScale) + GetShadowOffset(); 56 } 57 inline uptr ShadowToMem(uptr shadow_addr) { 58 return (shadow_addr - GetShadowOffset()) << kShadowScale; 59 } 60 inline uptr MemToShadowSize(uptr size) { 61 return size >> kShadowScale; 62 } 63 64 bool MemIsApp(uptr p); 65 66 inline bool MemIsShadow(uptr p) { 67 return (kLowShadowStart <= p && p <= kLowShadowEnd) || 68 (kHighShadowStart <= p && p <= kHighShadowEnd); 69 } 70 71 uptr GetAliasRegionStart(); 72 73 } // namespace __hwasan 74 75 #endif // HWASAN_MAPPING_H 76