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Diffstat (limited to 'contrib/compiler-rt/lib/asan/asan_mapping.h')
| -rw-r--r-- | contrib/compiler-rt/lib/asan/asan_mapping.h | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/asan/asan_mapping.h b/contrib/compiler-rt/lib/asan/asan_mapping.h new file mode 100644 index 0000000..2746754 --- /dev/null +++ b/contrib/compiler-rt/lib/asan/asan_mapping.h @@ -0,0 +1,271 @@ +//===-- 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: +// http://code.google.com/p/address-sanitizer/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/MIPS mapping: +// || `[0x2aaa0000, 0xffffffff]` || HighMem || +// || `[0x0fff4000, 0x2aa9ffff]` || HighShadow || +// || `[0x0bff4000, 0x0fff3fff]` || ShadowGap || +// || `[0x0aaa0000, 0x0bff3fff]` || LowShadow || +// || `[0x00000000, 0x0aa9ffff]` || 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 || + +static const u64 kDefaultShadowScale = 3; +static const u64 kDefaultShadowOffset32 = 1ULL << 29; // 0x20000000 +static const u64 kIosShadowOffset32 = 1ULL << 30; // 0x40000000 +static const u64 kDefaultShadowOffset64 = 1ULL << 44; +static const u64 kDefaultShort64bitShadowOffset = 0x7FFF8000; // < 2G. +static const u64 kAArch64_ShadowOffset64 = 1ULL << 36; +static const u64 kMIPS32_ShadowOffset32 = 0x0aaa0000; +static const u64 kMIPS64_ShadowOffset64 = 1ULL << 36; +static const u64 kPPC64_ShadowOffset64 = 1ULL << 41; +static const u64 kFreeBSD_ShadowOffset32 = 1ULL << 30; // 0x40000000 +static const u64 kFreeBSD_ShadowOffset64 = 1ULL << 46; // 0x400000000000 + +#define SHADOW_SCALE kDefaultShadowScale +#if SANITIZER_ANDROID +# define SHADOW_OFFSET (0) +#else +# if SANITIZER_WORDSIZE == 32 +# if defined(__mips__) +# define SHADOW_OFFSET kMIPS32_ShadowOffset32 +# elif SANITIZER_FREEBSD +# define SHADOW_OFFSET kFreeBSD_ShadowOffset32 +# else +# if SANITIZER_IOS +# define SHADOW_OFFSET kIosShadowOffset32 +# else +# define SHADOW_OFFSET kDefaultShadowOffset32 +# endif +# endif +# else +# if defined(__aarch64__) +# define SHADOW_OFFSET kAArch64_ShadowOffset64 +# elif defined(__powerpc64__) +# define SHADOW_OFFSET kPPC64_ShadowOffset64 +# elif SANITIZER_FREEBSD +# define SHADOW_OFFSET kFreeBSD_ShadowOffset64 +# elif SANITIZER_MAC +# define SHADOW_OFFSET kDefaultShadowOffset64 +# elif defined(__mips64) +# define SHADOW_OFFSET kMIPS64_ShadowOffset64 +# else +# define SHADOW_OFFSET kDefaultShort64bitShadowOffset +# endif +# endif +#endif + +#define SHADOW_GRANULARITY (1ULL << SHADOW_SCALE) +#define MEM_TO_SHADOW(mem) (((mem) >> SHADOW_SCALE) + (SHADOW_OFFSET)) +#define SHADOW_TO_MEM(shadow) (((shadow) - SHADOW_OFFSET) << SHADOW_SCALE) + +#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 (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) + +#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 + +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 AddrIsInHighMem(uptr a) { + PROFILE_ASAN_MAPPING(); + return a >= kHighMemBeg && a <= kHighMemEnd; +} + +static inline bool AddrIsInMidMem(uptr a) { + PROFILE_ASAN_MAPPING(); + return kMidMemBeg && a >= kMidMemBeg && a <= kMidMemEnd; +} + +static inline bool AddrIsInMem(uptr a) { + PROFILE_ASAN_MAPPING(); + return AddrIsInLowMem(a) || AddrIsInMidMem(a) || AddrIsInHighMem(a); +} + +static inline uptr MemToShadow(uptr p) { + PROFILE_ASAN_MAPPING(); + CHECK(AddrIsInMem(p)); + return MEM_TO_SHADOW(p); +} + +static inline bool AddrIsInHighShadow(uptr a) { + PROFILE_ASAN_MAPPING(); + return a >= kHighShadowBeg && a <= kHighMemEnd; +} + +static inline bool AddrIsInMidShadow(uptr a) { + PROFILE_ASAN_MAPPING(); + return kMidMemBeg && a >= kMidShadowBeg && a <= kMidMemEnd; +} + +static inline bool AddrIsInShadow(uptr a) { + PROFILE_ASAN_MAPPING(); + return AddrIsInLowShadow(a) || AddrIsInMidShadow(a) || AddrIsInHighShadow(a); +} + +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; +} + +static inline bool AddrIsAlignedByGranularity(uptr a) { + PROFILE_ASAN_MAPPING(); + return (a & (SHADOW_GRANULARITY - 1)) == 0; +} + +static inline bool AddressIsPoisoned(uptr a) { + PROFILE_ASAN_MAPPING(); + 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 |
