[asan] Implement address sanitizer on AIX: shadow memory #136874
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| //===-- asan_mapping_aix64.h ------------------------------------*- C++ -*-===// | ||
| // | ||
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
| // See https://llvm.org/LICENSE.txt for license information. | ||
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // This file is a part of AddressSanitizer, an address sanity checker. | ||
| // | ||
| // AIX64-specific definitions for ASan memory mapping. | ||
| //===----------------------------------------------------------------------===// | ||
| #ifndef ASAN_MAPPING_AIX64_H | ||
| #define ASAN_MAPPING_AIX64_H | ||
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| // https://www.ibm.com/docs/en/aix/7.3?topic=concepts-system-memory-allocation-using-malloc-subsystem | ||
| // | ||
| // For 64-bit on AIX, | ||
| // - Data, heap, bss region is from 0x0000 0001 0000 0000 to | ||
| // 0x07ff ffff ffff ffff (1ULL << 59). | ||
| // - Shared library regions is from: | ||
| // 0x0900 0000 0000 0000 to 0x09ff ffff ffff ffff | ||
| // or 0x0800 0000 0000 0000 to 0x08ff ffff ffff ffff ((1ULL << 52) * 2) | ||
| // - mmap region is from 0x0a00 0000 0000 0000 to 0x0aff ffff ffff ffff | ||
| // (1ULL << 52). | ||
| // - Initial stack region is from 0x0f00 0000 0000 0000 to | ||
| // 0x0fff ffff ffff ffff (1ULL << 56). | ||
| // | ||
| // All above ranges are too big. And after verifying on AIX,(these datas are | ||
| // from experiments on AIX72, AIX OS may change this layout in future) | ||
| // - the biggest heap size is 1ULL << 47. | ||
| // - the biggest global variable size is 1ULL << 29. (Which may be put in shared | ||
| // library data regions because global variables may be compiled to shared | ||
| // libraries.) | ||
| // the related address range for shared library data regions is: | ||
| // 0x0900 1000 0000 0000 to 0x0900 1001 0000 0000 | ||
| // or 0x0800 1000 0000 0000 to 0x0800 1001 0000 0000 (when above range is | ||
| // used by system libraries.) | ||
| // - the biggest mmap size is 1ULL << 46. | ||
| // - the biggest stack size is 1ULL << 32. | ||
| // | ||
| // We don't need so big heap and mmap, calling mmap for shadow memory for such | ||
| // big heap and mmap is quite slow on AIX, so to balance runtime and examinable | ||
| // memory size, we use 1ULL << 39(512GB) as size for each region except mmap | ||
| // region. For mmap region, aix system mmap function may return a big range | ||
| // address, we allocate 1ULL << 41(2TB). | ||
| // | ||
| // So the reasonable user space region size is: | ||
| // - Data, heap, bss is from 0x0 to 0x0000 007f ffff ffff | ||
| // - Shared library data is from: | ||
| // 0x0900 1000 0000 0000 to 0x0900 107f ffff ffff | ||
| // or 0x0800 1000 0000 0000 to 0x0800 107f ffff ffff | ||
| // - mmap is from 0x0a00 0000 0000 0000 to 0x0a00 01ff ffff ffff | ||
| // - Stack is from 0x0fff ff80 0000 0000 to 0x0fff ffff ffff ffff | ||
| // | ||
| // AIX64 set ASAN_SHADOW_OFFSET_CONST at 0x0a01000000000000 because mmap | ||
| // memory starts at 0x0a00000000000000 and shadow memory should be allocated | ||
| // there. And we keep 0x0a00000000000000 to 0x0a01000000000000 For user mmap | ||
| // usage. | ||
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| // NOTE: Users are not expected to use `mmap` specifying fixed address which is | ||
| // inside the shadow memory ranges. | ||
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| // Default AIX64 mapping: | ||
| // || `[0x0fffff8000000000, 0x0fffffffffffffff]` || HighMem || | ||
| // || `[0x0a80fff000000000, 0x0a80ffffffffffff]` || HighShadow || | ||
| // || `[0x0a41000000000000, 0x0a41003fffffffff]` || MidShadow || | ||
| // || `[0x0a21020000000000, 0x0a21020fffffffff]` || Mid2Shadow || | ||
| // || `[0x0a01020000000000, 0x0a01020fffffffff]` || Mid3Shadow || | ||
| // || `[0x0a01000000000000, 0x0a01000fffffffff]` || LowShadow || | ||
| // || `[0x0a00000000000000, 0x0a0001ffffffffff]` || MidMem || | ||
| // || `[0x0900100000000000, 0x0900107fffffffff]` || Mid2Mem || | ||
| // || `[0x0800100000000000, 0x0800107fffffffff]` || Mid3Mem || | ||
| // || `[0x0000000000000000, 0x0000007fffffffff]` || LowMem || | ||
|
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| #define VMA_BITS 58 | ||
| #define HIGH_BITS (64 - VMA_BITS) | ||
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| #define MEM_TO_SHADOW(mem) \ | ||
| ((((mem) << HIGH_BITS) >> (HIGH_BITS + (ASAN_SHADOW_SCALE))) + \ | ||
| ASAN_SHADOW_OFFSET) | ||
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| #define SHADOW_TO_MEM(ptr) (__asan::ShadowToMemAIX64(ptr)) | ||
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| #define kLowMemBeg 0ULL | ||
| #define kLowMemEnd 0x0000007fffffffffULL | ||
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| #define kLowShadowBeg ASAN_SHADOW_OFFSET | ||
| #define kLowShadowEnd MEM_TO_SHADOW(kLowMemEnd) | ||
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| #define kHighMemBeg 0x0fffff8000000000ULL | ||
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| #define kHighShadowBeg MEM_TO_SHADOW(kHighMemBeg) | ||
| #define kHighShadowEnd MEM_TO_SHADOW(kHighMemEnd) | ||
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| #define kMidMemBeg 0x0a00000000000000ULL | ||
| #define kMidMemEnd 0x0a0001ffffffffffULL | ||
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| #define kMidShadowBeg MEM_TO_SHADOW(kMidMemBeg) | ||
| #define kMidShadowEnd MEM_TO_SHADOW(kMidMemEnd) | ||
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| #define kMid2MemBeg 0x0900100000000000ULL | ||
| #define kMid2MemEnd 0x0900107fffffffffULL | ||
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| #define kMid2ShadowBeg MEM_TO_SHADOW(kMid2MemBeg) | ||
| #define kMid2ShadowEnd MEM_TO_SHADOW(kMid2MemEnd) | ||
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| #define kMid3MemBeg 0x0800100000000000ULL | ||
| #define kMid3MemEnd 0x0800107fffffffffULL | ||
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| #define kMid3ShadowBeg MEM_TO_SHADOW(kMid3MemBeg) | ||
| #define kMid3ShadowEnd MEM_TO_SHADOW(kMid3MemEnd) | ||
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| // AIX does not care about the gaps. | ||
| #define kZeroBaseShadowStart 0 | ||
| #define kZeroBaseMaxShadowStart 0 | ||
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| #define kShadowGapBeg 0 | ||
| #define kShadowGapEnd 0 | ||
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| #define kShadowGap2Beg 0 | ||
| #define kShadowGap2End 0 | ||
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| #define kShadowGap3Beg 0 | ||
| #define kShadowGap3End 0 | ||
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| #define kShadowGap4Beg 0 | ||
| #define kShadowGap4End 0 | ||
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| namespace __asan { | ||
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| static inline bool AddrIsInLowMem(uptr a) { | ||
| PROFILE_ASAN_MAPPING(); | ||
| return a <= kLowMemEnd; | ||
| } | ||
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| static inline bool AddrIsInLowShadow(uptr a) { | ||
| PROFILE_ASAN_MAPPING(); | ||
| return a >= kLowShadowBeg && a <= kLowShadowEnd; | ||
| } | ||
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| static inline bool AddrIsInMidMem(uptr a) { | ||
| PROFILE_ASAN_MAPPING(); | ||
| return (a >= kMidMemBeg && a <= kMidMemEnd) || | ||
| (a >= kMid2MemBeg && a <= kMid2MemEnd) || | ||
| (a >= kMid3MemBeg && a <= kMid3MemEnd); | ||
| } | ||
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| static inline bool AddrIsInMidShadow(uptr a) { | ||
| PROFILE_ASAN_MAPPING(); | ||
| return (a >= kMidShadowBeg && a <= kMidShadowEnd) || | ||
| (a >= kMid2ShadowBeg && a <= kMid2ShadowEnd) || | ||
| (a >= kMid3ShadowBeg && a <= kMid3ShadowEnd); | ||
| } | ||
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| static inline bool AddrIsInHighMem(uptr a) { | ||
| PROFILE_ASAN_MAPPING(); | ||
| return kHighMemBeg && a >= kHighMemBeg && a <= kHighMemEnd; | ||
| } | ||
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| static inline bool AddrIsInHighShadow(uptr a) { | ||
| PROFILE_ASAN_MAPPING(); | ||
| return kHighMemBeg && a >= kHighShadowBeg && a <= kHighShadowEnd; | ||
| } | ||
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| static inline bool AddrIsInShadowGap(uptr a) { return false; } | ||
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| static inline constexpr uptr ShadowToMemAIX64(uptr p) { | ||
| PROFILE_ASAN_MAPPING(); | ||
| p -= ASAN_SHADOW_OFFSET; | ||
| p <<= ASAN_SHADOW_SCALE; | ||
| if (p >= 0x3ffff8000000000ULL) { | ||
| // HighMem | ||
| p |= (0x03ULL << VMA_BITS); | ||
| } else if (p >= 0x100000000000ULL) { | ||
| // MidShadow/Mid2Shadow/Mid2Shadow | ||
| p |= (0x02ULL << VMA_BITS); | ||
| } | ||
| return p; | ||
| } | ||
|
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| } // namespace __asan | ||
|
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| #endif // ASAN_MAPPING_AIX64_H |
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why not just extend
if (value || SANITIZER_WINDOWS || SANITIZER_AIX ||