forked from OSchip/llvm-project
108 lines
3.6 KiB
C++
108 lines
3.6 KiB
C++
//===-- hwasan_allocator.h --------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of HWAddressSanitizer.
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//
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//===----------------------------------------------------------------------===//
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#ifndef HWASAN_ALLOCATOR_H
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#define HWASAN_ALLOCATOR_H
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#include "interception/interception.h"
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#include "sanitizer_common/sanitizer_allocator.h"
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#include "sanitizer_common/sanitizer_allocator_checks.h"
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#include "sanitizer_common/sanitizer_allocator_interface.h"
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#include "sanitizer_common/sanitizer_allocator_report.h"
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_ring_buffer.h"
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#include "hwasan_poisoning.h"
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#if !defined(__aarch64__) && !defined(__x86_64__)
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#error Unsupported platform
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#endif
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#if HWASAN_WITH_INTERCEPTORS
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DECLARE_REAL(void *, realloc, void *ptr, uptr size)
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DECLARE_REAL(void, free, void *ptr)
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#endif
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namespace __hwasan {
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struct Metadata {
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u32 requested_size : 31; // sizes are < 2G.
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u32 right_aligned : 1;
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u32 alloc_context_id;
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};
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struct HwasanMapUnmapCallback {
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void OnMap(uptr p, uptr size) const { UpdateMemoryUsage(); }
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void OnUnmap(uptr p, uptr size) const {
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// We are about to unmap a chunk of user memory.
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// It can return as user-requested mmap() or another thread stack.
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// Make it accessible with zero-tagged pointer.
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TagMemory(p, size, 0);
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}
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};
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static const uptr kMaxAllowedMallocSize = 2UL << 30; // 2G
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struct AP64 {
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static const uptr kSpaceBeg = ~0ULL;
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static const uptr kSpaceSize = 0x2000000000ULL;
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static const uptr kMetadataSize = sizeof(Metadata);
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typedef __sanitizer::VeryDenseSizeClassMap SizeClassMap;
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using AddressSpaceView = LocalAddressSpaceView;
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typedef HwasanMapUnmapCallback MapUnmapCallback;
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static const uptr kFlags = 0;
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};
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typedef SizeClassAllocator64<AP64> PrimaryAllocator;
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typedef SizeClassAllocatorLocalCache<PrimaryAllocator> AllocatorCache;
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typedef LargeMmapAllocator<HwasanMapUnmapCallback> SecondaryAllocator;
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typedef CombinedAllocator<PrimaryAllocator, AllocatorCache,
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SecondaryAllocator> Allocator;
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void AllocatorSwallowThreadLocalCache(AllocatorCache *cache);
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class HwasanChunkView {
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public:
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HwasanChunkView() : block_(0), metadata_(nullptr) {}
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HwasanChunkView(uptr block, Metadata *metadata)
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: block_(block), metadata_(metadata) {}
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bool IsAllocated() const; // Checks if the memory is currently allocated
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uptr Beg() const; // First byte of user memory
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uptr End() const; // Last byte of user memory
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uptr UsedSize() const; // Size requested by the user
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uptr ActualSize() const; // Size allocated by the allocator.
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u32 GetAllocStackId() const;
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bool FromSmallHeap() const;
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private:
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uptr block_;
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Metadata *const metadata_;
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};
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HwasanChunkView FindHeapChunkByAddress(uptr address);
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// Information about one (de)allocation that happened in the past.
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// These are recorded in a thread-local ring buffer.
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// TODO: this is currently 24 bytes (20 bytes + alignment).
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// Compress it to 16 bytes or extend it to be more useful.
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struct HeapAllocationRecord {
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uptr tagged_addr;
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u32 alloc_context_id;
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u32 free_context_id;
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u32 requested_size;
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};
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typedef RingBuffer<HeapAllocationRecord> HeapAllocationsRingBuffer;
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void GetAllocatorStats(AllocatorStatCounters s);
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} // namespace __hwasan
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#endif // HWASAN_ALLOCATOR_H
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