| //===-- asan_mapping.h ------------------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is a part of AddressSanitizer, an address sanity checker. |
| // |
| // Defines ASan memory mapping. |
| //===----------------------------------------------------------------------===// |
| #ifndef ASAN_MAPPING_H |
| #define ASAN_MAPPING_H |
| |
| #include "asan_internal.h" |
| |
| // The full explanation of the memory mapping could be found here: |
| // https://github.com/google/sanitizers/wiki/AddressSanitizerAlgorithm |
| // |
| // Typical shadow mapping on Linux/x86_64 with SHADOW_OFFSET == 0x00007fff8000: |
| // || `[0x10007fff8000, 0x7fffffffffff]` || HighMem || |
| // || `[0x02008fff7000, 0x10007fff7fff]` || HighShadow || |
| // || `[0x00008fff7000, 0x02008fff6fff]` || ShadowGap || |
| // || `[0x00007fff8000, 0x00008fff6fff]` || LowShadow || |
| // || `[0x000000000000, 0x00007fff7fff]` || LowMem || |
| // |
| // When SHADOW_OFFSET is zero (-pie): |
| // || `[0x100000000000, 0x7fffffffffff]` || HighMem || |
| // || `[0x020000000000, 0x0fffffffffff]` || HighShadow || |
| // || `[0x000000040000, 0x01ffffffffff]` || ShadowGap || |
| // |
| // Special case when something is already mapped between |
| // 0x003000000000 and 0x005000000000 (e.g. when prelink is installed): |
| // || `[0x10007fff8000, 0x7fffffffffff]` || HighMem || |
| // || `[0x02008fff7000, 0x10007fff7fff]` || HighShadow || |
| // || `[0x005000000000, 0x02008fff6fff]` || ShadowGap3 || |
| // || `[0x003000000000, 0x004fffffffff]` || MidMem || |
| // || `[0x000a7fff8000, 0x002fffffffff]` || ShadowGap2 || |
| // || `[0x00067fff8000, 0x000a7fff7fff]` || MidShadow || |
| // || `[0x00008fff7000, 0x00067fff7fff]` || ShadowGap || |
| // || `[0x00007fff8000, 0x00008fff6fff]` || LowShadow || |
| // || `[0x000000000000, 0x00007fff7fff]` || LowMem || |
| // |
| // Default Linux/i386 mapping on x86_64 machine: |
| // || `[0x40000000, 0xffffffff]` || HighMem || |
| // || `[0x28000000, 0x3fffffff]` || HighShadow || |
| // || `[0x24000000, 0x27ffffff]` || ShadowGap || |
| // || `[0x20000000, 0x23ffffff]` || LowShadow || |
| // || `[0x00000000, 0x1fffffff]` || LowMem || |
| // |
| // Default Linux/i386 mapping on i386 machine |
| // (addresses starting with 0xc0000000 are reserved |
| // for kernel and thus not sanitized): |
| // || `[0x38000000, 0xbfffffff]` || HighMem || |
| // || `[0x27000000, 0x37ffffff]` || HighShadow || |
| // || `[0x24000000, 0x26ffffff]` || ShadowGap || |
| // || `[0x20000000, 0x23ffffff]` || LowShadow || |
| // || `[0x00000000, 0x1fffffff]` || LowMem || |
| // |
| // Default Linux/MIPS32 mapping: |
| // || `[0x2aaa0000, 0xffffffff]` || HighMem || |
| // || `[0x0fff4000, 0x2aa9ffff]` || HighShadow || |
| // || `[0x0bff4000, 0x0fff3fff]` || ShadowGap || |
| // || `[0x0aaa0000, 0x0bff3fff]` || LowShadow || |
| // || `[0x00000000, 0x0aa9ffff]` || LowMem || |
| // |
| // Default Linux/MIPS64 mapping: |
| // || `[0x4000000000, 0xffffffffff]` || HighMem || |
| // || `[0x2800000000, 0x3fffffffff]` || HighShadow || |
| // || `[0x2400000000, 0x27ffffffff]` || ShadowGap || |
| // || `[0x2000000000, 0x23ffffffff]` || LowShadow || |
| // || `[0x0000000000, 0x1fffffffff]` || LowMem || |
| // |
| // Default Linux/AArch64 (39-bit VMA) mapping: |
| // || `[0x2000000000, 0x7fffffffff]` || highmem || |
| // || `[0x1400000000, 0x1fffffffff]` || highshadow || |
| // || `[0x1200000000, 0x13ffffffff]` || shadowgap || |
| // || `[0x1000000000, 0x11ffffffff]` || lowshadow || |
| // || `[0x0000000000, 0x0fffffffff]` || lowmem || |
| // |
| // Default Linux/AArch64 (42-bit VMA) mapping: |
| // || `[0x10000000000, 0x3ffffffffff]` || highmem || |
| // || `[0x0a000000000, 0x0ffffffffff]` || highshadow || |
| // || `[0x09000000000, 0x09fffffffff]` || shadowgap || |
| // || `[0x08000000000, 0x08fffffffff]` || lowshadow || |
| // || `[0x00000000000, 0x07fffffffff]` || lowmem || |
| // |
| // Default Linux/S390 mapping: |
| // || `[0x30000000, 0x7fffffff]` || HighMem || |
| // || `[0x26000000, 0x2fffffff]` || HighShadow || |
| // || `[0x24000000, 0x25ffffff]` || ShadowGap || |
| // || `[0x20000000, 0x23ffffff]` || LowShadow || |
| // || `[0x00000000, 0x1fffffff]` || LowMem || |
| // |
| // Default Linux/SystemZ mapping: |
| // || `[0x14000000000000, 0x1fffffffffffff]` || HighMem || |
| // || `[0x12800000000000, 0x13ffffffffffff]` || HighShadow || |
| // || `[0x12000000000000, 0x127fffffffffff]` || ShadowGap || |
| // || `[0x10000000000000, 0x11ffffffffffff]` || LowShadow || |
| // || `[0x00000000000000, 0x0fffffffffffff]` || LowMem || |
| // |
| // Shadow mapping on FreeBSD/x86-64 with SHADOW_OFFSET == 0x400000000000: |
| // || `[0x500000000000, 0x7fffffffffff]` || HighMem || |
| // || `[0x4a0000000000, 0x4fffffffffff]` || HighShadow || |
| // || `[0x480000000000, 0x49ffffffffff]` || ShadowGap || |
| // || `[0x400000000000, 0x47ffffffffff]` || LowShadow || |
| // || `[0x000000000000, 0x3fffffffffff]` || LowMem || |
| // |
| // Shadow mapping on FreeBSD/i386 with SHADOW_OFFSET == 0x40000000: |
| // || `[0x60000000, 0xffffffff]` || HighMem || |
| // || `[0x4c000000, 0x5fffffff]` || HighShadow || |
| // || `[0x48000000, 0x4bffffff]` || ShadowGap || |
| // || `[0x40000000, 0x47ffffff]` || LowShadow || |
| // || `[0x00000000, 0x3fffffff]` || LowMem || |
| // |
| // Shadow mapping on NetBSD/x86-64 with SHADOW_OFFSET == 0x400000000000: |
| // || `[0x4feffffffe01, 0x7f7ffffff000]` || HighMem || |
| // || `[0x49fdffffffc0, 0x4feffffffe00]` || HighShadow || |
| // || `[0x480000000000, 0x49fdffffffbf]` || ShadowGap || |
| // || `[0x400000000000, 0x47ffffffffff]` || LowShadow || |
| // || `[0x000000000000, 0x3fffffffffff]` || LowMem || |
| // |
| // Shadow mapping on NetBSD/i386 with SHADOW_OFFSET == 0x40000000: |
| // || `[0x60000000, 0xfffff000]` || HighMem || |
| // || `[0x4c000000, 0x5fffffff]` || HighShadow || |
| // || `[0x48000000, 0x4bffffff]` || ShadowGap || |
| // || `[0x40000000, 0x47ffffff]` || LowShadow || |
| // || `[0x00000000, 0x3fffffff]` || LowMem || |
| // |
| // Default Windows/i386 mapping: |
| // (the exact location of HighShadow/HighMem may vary depending |
| // on WoW64, /LARGEADDRESSAWARE, etc). |
| // || `[0x50000000, 0xffffffff]` || HighMem || |
| // || `[0x3a000000, 0x4fffffff]` || HighShadow || |
| // || `[0x36000000, 0x39ffffff]` || ShadowGap || |
| // || `[0x30000000, 0x35ffffff]` || LowShadow || |
| // || `[0x00000000, 0x2fffffff]` || LowMem || |
| // |
| // Shadow mapping on Myriad2 (for shadow scale 5): |
| // || `[0x9ff80000, 0x9fffffff]` || ShadowGap || |
| // || `[0x9f000000, 0x9ff7ffff]` || LowShadow || |
| // || `[0x80000000, 0x9effffff]` || LowMem || |
| // || `[0x00000000, 0x7fffffff]` || Ignored || |
| |
| #if defined(ASAN_SHADOW_SCALE) |
| static const u64 kDefaultShadowScale = ASAN_SHADOW_SCALE; |
| #else |
| static const u64 kDefaultShadowScale = SANITIZER_MYRIAD2 ? 5 : 3; |
| #endif |
| static const u64 kDefaultShadowSentinel = ~(uptr)0; |
| static const u64 kDefaultShadowOffset32 = 1ULL << 29; // 0x20000000 |
| static const u64 kDefaultShadowOffset64 = 1ULL << 44; |
| static const u64 kDefaultShort64bitShadowOffset = |
| 0x7FFFFFFF & (~0xFFFULL << kDefaultShadowScale); // < 2G. |
| static const u64 kIosShadowOffset32 = 1ULL << 30; // 0x40000000 |
| static const u64 kIosShadowOffset64 = 0x120200000; |
| static const u64 kIosSimShadowOffset32 = 1ULL << 30; |
| static const u64 kIosSimShadowOffset64 = kDefaultShadowOffset64; |
| static const u64 kAArch64_ShadowOffset64 = 1ULL << 36; |
| static const u64 kMIPS32_ShadowOffset32 = 0x0aaa0000; |
| static const u64 kMIPS64_ShadowOffset64 = 1ULL << 37; |
| static const u64 kPPC64_ShadowOffset64 = 1ULL << 44; |
| static const u64 kSystemZ_ShadowOffset64 = 1ULL << 52; |
| static const u64 kFreeBSD_ShadowOffset32 = 1ULL << 30; // 0x40000000 |
| static const u64 kFreeBSD_ShadowOffset64 = 1ULL << 46; // 0x400000000000 |
| static const u64 kNetBSD_ShadowOffset32 = 1ULL << 30; // 0x40000000 |
| static const u64 kNetBSD_ShadowOffset64 = 1ULL << 46; // 0x400000000000 |
| static const u64 kWindowsShadowOffset32 = 3ULL << 28; // 0x30000000 |
| |
| static const u64 kMyriadMemoryOffset32 = 0x80000000ULL; |
| static const u64 kMyriadMemorySize32 = 0x20000000ULL; |
| static const u64 kMyriadMemoryEnd32 = |
| kMyriadMemoryOffset32 + kMyriadMemorySize32 - 1; |
| static const u64 kMyriadShadowOffset32 = |
| (kMyriadMemoryOffset32 + kMyriadMemorySize32 - |
| (kMyriadMemorySize32 >> kDefaultShadowScale)); |
| static const u64 kMyriadCacheBitMask32 = 0x40000000ULL; |
| |
| #define SHADOW_SCALE kDefaultShadowScale |
| |
| #if SANITIZER_FUCHSIA |
| # define SHADOW_OFFSET (0) |
| #elif SANITIZER_WORDSIZE == 32 |
| # if SANITIZER_ANDROID |
| # define SHADOW_OFFSET __asan_shadow_memory_dynamic_address |
| # elif defined(__mips__) |
| # define SHADOW_OFFSET kMIPS32_ShadowOffset32 |
| # elif SANITIZER_FREEBSD |
| # define SHADOW_OFFSET kFreeBSD_ShadowOffset32 |
| # elif SANITIZER_NETBSD |
| # define SHADOW_OFFSET kNetBSD_ShadowOffset32 |
| # elif SANITIZER_WINDOWS |
| # define SHADOW_OFFSET kWindowsShadowOffset32 |
| # elif SANITIZER_IOS |
| # if SANITIZER_IOSSIM |
| # define SHADOW_OFFSET kIosSimShadowOffset32 |
| # else |
| # define SHADOW_OFFSET kIosShadowOffset32 |
| # endif |
| # elif SANITIZER_MYRIAD2 |
| # define SHADOW_OFFSET kMyriadShadowOffset32 |
| # else |
| # define SHADOW_OFFSET kDefaultShadowOffset32 |
| # endif |
| #else |
| # if SANITIZER_IOS |
| # if SANITIZER_IOSSIM |
| # define SHADOW_OFFSET kIosSimShadowOffset64 |
| # else |
| # define SHADOW_OFFSET __asan_shadow_memory_dynamic_address |
| # endif |
| # elif defined(__aarch64__) |
| # define SHADOW_OFFSET kAArch64_ShadowOffset64 |
| # elif defined(__powerpc64__) |
| # define SHADOW_OFFSET kPPC64_ShadowOffset64 |
| # elif defined(__s390x__) |
| # define SHADOW_OFFSET kSystemZ_ShadowOffset64 |
| # elif SANITIZER_FREEBSD |
| # define SHADOW_OFFSET kFreeBSD_ShadowOffset64 |
| # elif SANITIZER_NETBSD |
| # define SHADOW_OFFSET kNetBSD_ShadowOffset64 |
| # elif SANITIZER_MAC |
| # define SHADOW_OFFSET kDefaultShadowOffset64 |
| # elif defined(__mips64) |
| # define SHADOW_OFFSET kMIPS64_ShadowOffset64 |
| # elif SANITIZER_WINDOWS64 |
| # define SHADOW_OFFSET __asan_shadow_memory_dynamic_address |
| # else |
| # define SHADOW_OFFSET kDefaultShort64bitShadowOffset |
| # endif |
| #endif |
| |
| #if SANITIZER_ANDROID && defined(__arm__) |
| # define ASAN_PREMAP_SHADOW 1 |
| #else |
| # define ASAN_PREMAP_SHADOW 0 |
| #endif |
| |
| #define SHADOW_GRANULARITY (1ULL << SHADOW_SCALE) |
| |
| #define DO_ASAN_MAPPING_PROFILE 0 // Set to 1 to profile the functions below. |
| |
| #if DO_ASAN_MAPPING_PROFILE |
| # define PROFILE_ASAN_MAPPING() AsanMappingProfile[__LINE__]++; |
| #else |
| # define PROFILE_ASAN_MAPPING() |
| #endif |
| |
| // If 1, all shadow boundaries are constants. |
| // Don't set to 1 other than for testing. |
| #define ASAN_FIXED_MAPPING 0 |
| |
| namespace __asan { |
| |
| extern uptr AsanMappingProfile[]; |
| |
| #if ASAN_FIXED_MAPPING |
| // Fixed mapping for 64-bit Linux. Mostly used for performance comparison |
| // with non-fixed mapping. As of r175253 (Feb 2013) the performance |
| // difference between fixed and non-fixed mapping is below the noise level. |
| static uptr kHighMemEnd = 0x7fffffffffffULL; |
| static uptr kMidMemBeg = 0x3000000000ULL; |
| static uptr kMidMemEnd = 0x4fffffffffULL; |
| #else |
| extern uptr kHighMemEnd, kMidMemBeg, kMidMemEnd; // Initialized in __asan_init. |
| #endif |
| |
| } // namespace __asan |
| |
| #if SANITIZER_MYRIAD2 |
| #include "asan_mapping_myriad.h" |
| #else |
| #define MEM_TO_SHADOW(mem) (((mem) >> SHADOW_SCALE) + (SHADOW_OFFSET)) |
| |
| #define kLowMemBeg 0 |
| #define kLowMemEnd (SHADOW_OFFSET ? SHADOW_OFFSET - 1 : 0) |
| |
| #define kLowShadowBeg SHADOW_OFFSET |
| #define kLowShadowEnd MEM_TO_SHADOW(kLowMemEnd) |
| |
| #define kHighMemBeg (MEM_TO_SHADOW(kHighMemEnd) + 1) |
| |
| #define kHighShadowBeg MEM_TO_SHADOW(kHighMemBeg) |
| #define kHighShadowEnd MEM_TO_SHADOW(kHighMemEnd) |
| |
| # define kMidShadowBeg MEM_TO_SHADOW(kMidMemBeg) |
| # define kMidShadowEnd MEM_TO_SHADOW(kMidMemEnd) |
| |
| // With the zero shadow base we can not actually map pages starting from 0. |
| // This constant is somewhat arbitrary. |
| #define kZeroBaseShadowStart 0 |
| #define kZeroBaseMaxShadowStart (1 << 18) |
| |
| #define kShadowGapBeg (kLowShadowEnd ? kLowShadowEnd + 1 \ |
| : kZeroBaseShadowStart) |
| #define kShadowGapEnd ((kMidMemBeg ? kMidShadowBeg : kHighShadowBeg) - 1) |
| |
| #define kShadowGap2Beg (kMidMemBeg ? kMidShadowEnd + 1 : 0) |
| #define kShadowGap2End (kMidMemBeg ? kMidMemBeg - 1 : 0) |
| |
| #define kShadowGap3Beg (kMidMemBeg ? kMidMemEnd + 1 : 0) |
| #define kShadowGap3End (kMidMemBeg ? kHighShadowBeg - 1 : 0) |
| |
| namespace __asan { |
| |
| static inline bool AddrIsInLowMem(uptr a) { |
| PROFILE_ASAN_MAPPING(); |
| return a <= kLowMemEnd; |
| } |
| |
| static inline bool AddrIsInLowShadow(uptr a) { |
| PROFILE_ASAN_MAPPING(); |
| return a >= kLowShadowBeg && a <= kLowShadowEnd; |
| } |
| |
| static inline bool AddrIsInMidMem(uptr a) { |
| PROFILE_ASAN_MAPPING(); |
| return kMidMemBeg && a >= kMidMemBeg && a <= kMidMemEnd; |
| } |
| |
| static inline bool AddrIsInMidShadow(uptr a) { |
| PROFILE_ASAN_MAPPING(); |
| return kMidMemBeg && a >= kMidShadowBeg && a <= kMidShadowEnd; |
| } |
| |
| static inline bool AddrIsInHighMem(uptr a) { |
| PROFILE_ASAN_MAPPING(); |
| return kHighMemBeg && a >= kHighMemBeg && a <= kHighMemEnd; |
| } |
| |
| static inline bool AddrIsInHighShadow(uptr a) { |
| PROFILE_ASAN_MAPPING(); |
| return kHighMemBeg && a >= kHighShadowBeg && a <= kHighShadowEnd; |
| } |
| |
| static inline bool AddrIsInShadowGap(uptr a) { |
| PROFILE_ASAN_MAPPING(); |
| if (kMidMemBeg) { |
| if (a <= kShadowGapEnd) |
| return SHADOW_OFFSET == 0 || a >= kShadowGapBeg; |
| return (a >= kShadowGap2Beg && a <= kShadowGap2End) || |
| (a >= kShadowGap3Beg && a <= kShadowGap3End); |
| } |
| // In zero-based shadow mode we treat addresses near zero as addresses |
| // in shadow gap as well. |
| if (SHADOW_OFFSET == 0) |
| return a <= kShadowGapEnd; |
| return a >= kShadowGapBeg && a <= kShadowGapEnd; |
| } |
| |
| } // namespace __asan |
| |
| #endif // SANITIZER_MYRIAD2 |
| |
| namespace __asan { |
| |
| static inline bool AddrIsInMem(uptr a) { |
| PROFILE_ASAN_MAPPING(); |
| return AddrIsInLowMem(a) || AddrIsInMidMem(a) || AddrIsInHighMem(a) || |
| (flags()->protect_shadow_gap == 0 && AddrIsInShadowGap(a)); |
| } |
| |
| static inline uptr MemToShadow(uptr p) { |
| PROFILE_ASAN_MAPPING(); |
| CHECK(AddrIsInMem(p)); |
| return MEM_TO_SHADOW(p); |
| } |
| |
| static inline bool AddrIsInShadow(uptr a) { |
| PROFILE_ASAN_MAPPING(); |
| return AddrIsInLowShadow(a) || AddrIsInMidShadow(a) || AddrIsInHighShadow(a); |
| } |
| |
| static inline bool AddrIsAlignedByGranularity(uptr a) { |
| PROFILE_ASAN_MAPPING(); |
| return (a & (SHADOW_GRANULARITY - 1)) == 0; |
| } |
| |
| static inline bool AddressIsPoisoned(uptr a) { |
| PROFILE_ASAN_MAPPING(); |
| if (SANITIZER_MYRIAD2 && !AddrIsInMem(a) && !AddrIsInShadow(a)) |
| return false; |
| const uptr kAccessSize = 1; |
| u8 *shadow_address = (u8*)MEM_TO_SHADOW(a); |
| s8 shadow_value = *shadow_address; |
| if (shadow_value) { |
| u8 last_accessed_byte = (a & (SHADOW_GRANULARITY - 1)) |
| + kAccessSize - 1; |
| return (last_accessed_byte >= shadow_value); |
| } |
| return false; |
| } |
| |
| // Must be after all calls to PROFILE_ASAN_MAPPING(). |
| static const uptr kAsanMappingProfileSize = __LINE__; |
| |
| } // namespace __asan |
| |
| #endif // ASAN_MAPPING_H |