forked from OSchip/llvm-project
105 lines
3.6 KiB
C++
105 lines
3.6 KiB
C++
//===-- scudo_allocator.h ---------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// Header for scudo_allocator.cpp.
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///
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//===----------------------------------------------------------------------===//
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#ifndef SCUDO_ALLOCATOR_H_
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#define SCUDO_ALLOCATOR_H_
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#include "scudo_flags.h"
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#include "sanitizer_common/sanitizer_allocator.h"
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#if !SANITIZER_LINUX
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# error "The Scudo hardened allocator is currently only supported on Linux."
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#endif
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namespace __scudo {
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enum AllocType : u8 {
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FromMalloc = 0, // Memory block came from malloc, realloc, calloc, etc.
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FromNew = 1, // Memory block came from operator new.
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FromNewArray = 2, // Memory block came from operator new [].
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FromMemalign = 3, // Memory block came from memalign, posix_memalign, etc.
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};
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enum ChunkState : u8 {
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ChunkAvailable = 0,
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ChunkAllocated = 1,
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ChunkQuarantine = 2
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};
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// Our header requires 64 bits of storage. Having the offset saves us from
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// using functions such as GetBlockBegin, that is fairly costly. Our first
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// implementation used the MetaData as well, which offers the advantage of
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// being stored away from the chunk itself, but accessing it was costly as
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// well. The header will be atomically loaded and stored using the 16-byte
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// primitives offered by the platform (likely requires cmpxchg16b support).
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typedef u64 PackedHeader;
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struct UnpackedHeader {
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u64 Checksum : 16;
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u64 UnusedBytes : 20; // Needed for reallocation purposes.
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u64 State : 2; // available, allocated, or quarantined
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u64 AllocType : 2; // malloc, new, new[], or memalign
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u64 Offset : 16; // Offset from the beginning of the backend
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// allocation to the beginning of the chunk itself,
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// in multiples of MinAlignment. See comment about
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// its maximum value and test in init().
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u64 Salt : 8;
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};
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typedef atomic_uint64_t AtomicPackedHeader;
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COMPILER_CHECK(sizeof(UnpackedHeader) == sizeof(PackedHeader));
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// Minimum alignment of 8 bytes for 32-bit, 16 for 64-bit
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const uptr MinAlignmentLog = FIRST_32_SECOND_64(3, 4);
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const uptr MaxAlignmentLog = 24; // 16 MB
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const uptr MinAlignment = 1 << MinAlignmentLog;
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const uptr MaxAlignment = 1 << MaxAlignmentLog;
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const uptr ChunkHeaderSize = sizeof(PackedHeader);
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const uptr AlignedChunkHeaderSize =
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(ChunkHeaderSize + MinAlignment - 1) & ~(MinAlignment - 1);
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struct AllocatorOptions {
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u32 QuarantineSizeMb;
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u32 ThreadLocalQuarantineSizeKb;
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bool MayReturnNull;
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s32 ReleaseToOSIntervalMs;
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bool DeallocationTypeMismatch;
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bool DeleteSizeMismatch;
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bool ZeroContents;
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void setFrom(const Flags *f, const CommonFlags *cf);
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void copyTo(Flags *f, CommonFlags *cf) const;
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};
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void initAllocator(const AllocatorOptions &options);
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void drainQuarantine();
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void *scudoMalloc(uptr Size, AllocType Type);
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void scudoFree(void *Ptr, AllocType Type);
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void scudoSizedFree(void *Ptr, uptr Size, AllocType Type);
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void *scudoRealloc(void *Ptr, uptr Size);
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void *scudoCalloc(uptr NMemB, uptr Size);
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void *scudoMemalign(uptr Alignment, uptr Size);
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void *scudoValloc(uptr Size);
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void *scudoPvalloc(uptr Size);
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int scudoPosixMemalign(void **MemPtr, uptr Alignment, uptr Size);
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void *scudoAlignedAlloc(uptr Alignment, uptr Size);
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uptr scudoMallocUsableSize(void *Ptr);
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#include "scudo_allocator_secondary.h"
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} // namespace __scudo
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#endif // SCUDO_ALLOCATOR_H_
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