forked from OSchip/llvm-project
925 lines
32 KiB
C++
925 lines
32 KiB
C++
//===-- asan_allocator.cc -------------------------------------------------===//
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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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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// Implementation of ASan's memory allocator, 2-nd version.
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// This variant uses the allocator from sanitizer_common, i.e. the one shared
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// with ThreadSanitizer and MemorySanitizer.
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//
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//===----------------------------------------------------------------------===//
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#include "asan_allocator.h"
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#include "asan_mapping.h"
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#include "asan_poisoning.h"
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#include "asan_report.h"
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#include "asan_stack.h"
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#include "asan_thread.h"
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#include "sanitizer_common/sanitizer_allocator_interface.h"
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#include "sanitizer_common/sanitizer_flags.h"
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#include "sanitizer_common/sanitizer_internal_defs.h"
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#include "sanitizer_common/sanitizer_list.h"
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#include "sanitizer_common/sanitizer_stackdepot.h"
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#include "sanitizer_common/sanitizer_quarantine.h"
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#include "lsan/lsan_common.h"
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namespace __asan {
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// Valid redzone sizes are 16, 32, 64, ... 2048, so we encode them in 3 bits.
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// We use adaptive redzones: for larger allocation larger redzones are used.
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static u32 RZLog2Size(u32 rz_log) {
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CHECK_LT(rz_log, 8);
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return 16 << rz_log;
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}
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static u32 RZSize2Log(u32 rz_size) {
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CHECK_GE(rz_size, 16);
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CHECK_LE(rz_size, 2048);
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CHECK(IsPowerOfTwo(rz_size));
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u32 res = Log2(rz_size) - 4;
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CHECK_EQ(rz_size, RZLog2Size(res));
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return res;
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}
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static AsanAllocator &get_allocator();
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// The memory chunk allocated from the underlying allocator looks like this:
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// L L L L L L H H U U U U U U R R
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// L -- left redzone words (0 or more bytes)
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// H -- ChunkHeader (16 bytes), which is also a part of the left redzone.
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// U -- user memory.
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// R -- right redzone (0 or more bytes)
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// ChunkBase consists of ChunkHeader and other bytes that overlap with user
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// memory.
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// If the left redzone is greater than the ChunkHeader size we store a magic
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// value in the first uptr word of the memory block and store the address of
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// ChunkBase in the next uptr.
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// M B L L L L L L L L L H H U U U U U U
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// | ^
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// ---------------------|
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// M -- magic value kAllocBegMagic
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// B -- address of ChunkHeader pointing to the first 'H'
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static const uptr kAllocBegMagic = 0xCC6E96B9;
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struct ChunkHeader {
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// 1-st 8 bytes.
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u32 chunk_state : 8; // Must be first.
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u32 alloc_tid : 24;
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u32 free_tid : 24;
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u32 from_memalign : 1;
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u32 alloc_type : 2;
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u32 rz_log : 3;
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u32 lsan_tag : 2;
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// 2-nd 8 bytes
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// This field is used for small sizes. For large sizes it is equal to
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// SizeClassMap::kMaxSize and the actual size is stored in the
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// SecondaryAllocator's metadata.
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u32 user_requested_size;
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u32 alloc_context_id;
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};
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struct ChunkBase : ChunkHeader {
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// Header2, intersects with user memory.
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u32 free_context_id;
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};
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static const uptr kChunkHeaderSize = sizeof(ChunkHeader);
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static const uptr kChunkHeader2Size = sizeof(ChunkBase) - kChunkHeaderSize;
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COMPILER_CHECK(kChunkHeaderSize == 16);
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COMPILER_CHECK(kChunkHeader2Size <= 16);
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// Every chunk of memory allocated by this allocator can be in one of 3 states:
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// CHUNK_AVAILABLE: the chunk is in the free list and ready to be allocated.
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// CHUNK_ALLOCATED: the chunk is allocated and not yet freed.
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// CHUNK_QUARANTINE: the chunk was freed and put into quarantine zone.
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enum {
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CHUNK_AVAILABLE = 0, // 0 is the default value even if we didn't set it.
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CHUNK_ALLOCATED = 2,
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CHUNK_QUARANTINE = 3
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};
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struct AsanChunk: ChunkBase {
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uptr Beg() { return reinterpret_cast<uptr>(this) + kChunkHeaderSize; }
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uptr UsedSize(bool locked_version = false) {
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if (user_requested_size != SizeClassMap::kMaxSize)
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return user_requested_size;
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return *reinterpret_cast<uptr *>(
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get_allocator().GetMetaData(AllocBeg(locked_version)));
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}
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void *AllocBeg(bool locked_version = false) {
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if (from_memalign) {
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if (locked_version)
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return get_allocator().GetBlockBeginFastLocked(
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reinterpret_cast<void *>(this));
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return get_allocator().GetBlockBegin(reinterpret_cast<void *>(this));
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}
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return reinterpret_cast<void*>(Beg() - RZLog2Size(rz_log));
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}
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bool AddrIsInside(uptr addr, bool locked_version = false) {
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return (addr >= Beg()) && (addr < Beg() + UsedSize(locked_version));
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}
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};
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struct QuarantineCallback {
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explicit QuarantineCallback(AllocatorCache *cache)
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: cache_(cache) {
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}
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void Recycle(AsanChunk *m) {
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CHECK_EQ(m->chunk_state, CHUNK_QUARANTINE);
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atomic_store((atomic_uint8_t*)m, CHUNK_AVAILABLE, memory_order_relaxed);
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CHECK_NE(m->alloc_tid, kInvalidTid);
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CHECK_NE(m->free_tid, kInvalidTid);
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PoisonShadow(m->Beg(),
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RoundUpTo(m->UsedSize(), SHADOW_GRANULARITY),
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kAsanHeapLeftRedzoneMagic);
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void *p = reinterpret_cast<void *>(m->AllocBeg());
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if (p != m) {
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uptr *alloc_magic = reinterpret_cast<uptr *>(p);
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CHECK_EQ(alloc_magic[0], kAllocBegMagic);
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// Clear the magic value, as allocator internals may overwrite the
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// contents of deallocated chunk, confusing GetAsanChunk lookup.
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alloc_magic[0] = 0;
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CHECK_EQ(alloc_magic[1], reinterpret_cast<uptr>(m));
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}
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// Statistics.
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AsanStats &thread_stats = GetCurrentThreadStats();
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thread_stats.real_frees++;
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thread_stats.really_freed += m->UsedSize();
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get_allocator().Deallocate(cache_, p);
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}
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void *Allocate(uptr size) {
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return get_allocator().Allocate(cache_, size, 1, false);
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}
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void Deallocate(void *p) {
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get_allocator().Deallocate(cache_, p);
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}
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AllocatorCache *cache_;
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};
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typedef Quarantine<QuarantineCallback, AsanChunk> AsanQuarantine;
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typedef AsanQuarantine::Cache QuarantineCache;
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void AsanMapUnmapCallback::OnMap(uptr p, uptr size) const {
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PoisonShadow(p, size, kAsanHeapLeftRedzoneMagic);
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// Statistics.
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AsanStats &thread_stats = GetCurrentThreadStats();
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thread_stats.mmaps++;
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thread_stats.mmaped += size;
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}
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void AsanMapUnmapCallback::OnUnmap(uptr p, uptr size) const {
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PoisonShadow(p, size, 0);
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// We are about to unmap a chunk of user memory.
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// Mark the corresponding shadow memory as not needed.
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FlushUnneededASanShadowMemory(p, size);
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// Statistics.
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AsanStats &thread_stats = GetCurrentThreadStats();
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thread_stats.munmaps++;
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thread_stats.munmaped += size;
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}
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// We can not use THREADLOCAL because it is not supported on some of the
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// platforms we care about (OSX 10.6, Android).
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// static THREADLOCAL AllocatorCache cache;
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AllocatorCache *GetAllocatorCache(AsanThreadLocalMallocStorage *ms) {
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CHECK(ms);
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return &ms->allocator_cache;
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}
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QuarantineCache *GetQuarantineCache(AsanThreadLocalMallocStorage *ms) {
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CHECK(ms);
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CHECK_LE(sizeof(QuarantineCache), sizeof(ms->quarantine_cache));
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return reinterpret_cast<QuarantineCache *>(ms->quarantine_cache);
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}
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void AllocatorOptions::SetFrom(const Flags *f, const CommonFlags *cf) {
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quarantine_size_mb = f->quarantine_size_mb;
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min_redzone = f->redzone;
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max_redzone = f->max_redzone;
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may_return_null = cf->allocator_may_return_null;
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alloc_dealloc_mismatch = f->alloc_dealloc_mismatch;
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}
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void AllocatorOptions::CopyTo(Flags *f, CommonFlags *cf) {
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f->quarantine_size_mb = quarantine_size_mb;
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f->redzone = min_redzone;
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f->max_redzone = max_redzone;
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cf->allocator_may_return_null = may_return_null;
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f->alloc_dealloc_mismatch = alloc_dealloc_mismatch;
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}
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struct Allocator {
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static const uptr kMaxAllowedMallocSize =
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FIRST_32_SECOND_64(3UL << 30, 1ULL << 40);
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static const uptr kMaxThreadLocalQuarantine =
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FIRST_32_SECOND_64(1 << 18, 1 << 20);
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AsanAllocator allocator;
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AsanQuarantine quarantine;
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StaticSpinMutex fallback_mutex;
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AllocatorCache fallback_allocator_cache;
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QuarantineCache fallback_quarantine_cache;
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// ------------------- Options --------------------------
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atomic_uint16_t min_redzone;
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atomic_uint16_t max_redzone;
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atomic_uint8_t alloc_dealloc_mismatch;
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// ------------------- Initialization ------------------------
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explicit Allocator(LinkerInitialized)
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: quarantine(LINKER_INITIALIZED),
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fallback_quarantine_cache(LINKER_INITIALIZED) {}
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void CheckOptions(const AllocatorOptions &options) const {
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CHECK_GE(options.min_redzone, 16);
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CHECK_GE(options.max_redzone, options.min_redzone);
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CHECK_LE(options.max_redzone, 2048);
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CHECK(IsPowerOfTwo(options.min_redzone));
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CHECK(IsPowerOfTwo(options.max_redzone));
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}
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void SharedInitCode(const AllocatorOptions &options) {
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CheckOptions(options);
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quarantine.Init((uptr)options.quarantine_size_mb << 20,
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kMaxThreadLocalQuarantine);
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atomic_store(&alloc_dealloc_mismatch, options.alloc_dealloc_mismatch,
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memory_order_release);
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atomic_store(&min_redzone, options.min_redzone, memory_order_release);
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atomic_store(&max_redzone, options.max_redzone, memory_order_release);
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}
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void Initialize(const AllocatorOptions &options) {
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allocator.Init(options.may_return_null);
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SharedInitCode(options);
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}
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void ReInitialize(const AllocatorOptions &options) {
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allocator.SetMayReturnNull(options.may_return_null);
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SharedInitCode(options);
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}
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void GetOptions(AllocatorOptions *options) const {
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options->quarantine_size_mb = quarantine.GetSize() >> 20;
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options->min_redzone = atomic_load(&min_redzone, memory_order_acquire);
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options->max_redzone = atomic_load(&max_redzone, memory_order_acquire);
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options->may_return_null = allocator.MayReturnNull();
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options->alloc_dealloc_mismatch =
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atomic_load(&alloc_dealloc_mismatch, memory_order_acquire);
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}
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// -------------------- Helper methods. -------------------------
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uptr ComputeRZLog(uptr user_requested_size) {
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u32 rz_log =
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user_requested_size <= 64 - 16 ? 0 :
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user_requested_size <= 128 - 32 ? 1 :
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user_requested_size <= 512 - 64 ? 2 :
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user_requested_size <= 4096 - 128 ? 3 :
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user_requested_size <= (1 << 14) - 256 ? 4 :
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user_requested_size <= (1 << 15) - 512 ? 5 :
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user_requested_size <= (1 << 16) - 1024 ? 6 : 7;
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u32 min_rz = atomic_load(&min_redzone, memory_order_acquire);
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u32 max_rz = atomic_load(&max_redzone, memory_order_acquire);
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return Min(Max(rz_log, RZSize2Log(min_rz)), RZSize2Log(max_rz));
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}
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// We have an address between two chunks, and we want to report just one.
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AsanChunk *ChooseChunk(uptr addr, AsanChunk *left_chunk,
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AsanChunk *right_chunk) {
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// Prefer an allocated chunk over freed chunk and freed chunk
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// over available chunk.
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if (left_chunk->chunk_state != right_chunk->chunk_state) {
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if (left_chunk->chunk_state == CHUNK_ALLOCATED)
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return left_chunk;
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if (right_chunk->chunk_state == CHUNK_ALLOCATED)
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return right_chunk;
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if (left_chunk->chunk_state == CHUNK_QUARANTINE)
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return left_chunk;
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if (right_chunk->chunk_state == CHUNK_QUARANTINE)
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return right_chunk;
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}
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// Same chunk_state: choose based on offset.
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sptr l_offset = 0, r_offset = 0;
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CHECK(AsanChunkView(left_chunk).AddrIsAtRight(addr, 1, &l_offset));
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CHECK(AsanChunkView(right_chunk).AddrIsAtLeft(addr, 1, &r_offset));
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if (l_offset < r_offset)
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return left_chunk;
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return right_chunk;
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}
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// -------------------- Allocation/Deallocation routines ---------------
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void *Allocate(uptr size, uptr alignment, BufferedStackTrace *stack,
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AllocType alloc_type, bool can_fill) {
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if (UNLIKELY(!asan_inited))
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AsanInitFromRtl();
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Flags &fl = *flags();
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CHECK(stack);
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const uptr min_alignment = SHADOW_GRANULARITY;
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if (alignment < min_alignment)
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alignment = min_alignment;
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if (size == 0) {
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// We'd be happy to avoid allocating memory for zero-size requests, but
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// some programs/tests depend on this behavior and assume that malloc
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// would not return NULL even for zero-size allocations. Moreover, it
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// looks like operator new should never return NULL, and results of
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// consecutive "new" calls must be different even if the allocated size
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// is zero.
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size = 1;
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}
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CHECK(IsPowerOfTwo(alignment));
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uptr rz_log = ComputeRZLog(size);
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uptr rz_size = RZLog2Size(rz_log);
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uptr rounded_size = RoundUpTo(Max(size, kChunkHeader2Size), alignment);
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uptr needed_size = rounded_size + rz_size;
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if (alignment > min_alignment)
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needed_size += alignment;
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bool using_primary_allocator = true;
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// If we are allocating from the secondary allocator, there will be no
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// automatic right redzone, so add the right redzone manually.
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if (!PrimaryAllocator::CanAllocate(needed_size, alignment)) {
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needed_size += rz_size;
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using_primary_allocator = false;
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}
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CHECK(IsAligned(needed_size, min_alignment));
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if (size > kMaxAllowedMallocSize || needed_size > kMaxAllowedMallocSize) {
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Report("WARNING: AddressSanitizer failed to allocate 0x%zx bytes\n",
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(void*)size);
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return allocator.ReturnNullOrDie();
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}
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AsanThread *t = GetCurrentThread();
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void *allocated;
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bool check_rss_limit = true;
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if (t) {
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AllocatorCache *cache = GetAllocatorCache(&t->malloc_storage());
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allocated =
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allocator.Allocate(cache, needed_size, 8, false, check_rss_limit);
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} else {
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SpinMutexLock l(&fallback_mutex);
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AllocatorCache *cache = &fallback_allocator_cache;
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allocated =
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allocator.Allocate(cache, needed_size, 8, false, check_rss_limit);
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}
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if (!allocated)
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return allocator.ReturnNullOrDie();
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if (*(u8 *)MEM_TO_SHADOW((uptr)allocated) == 0 && CanPoisonMemory()) {
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// Heap poisoning is enabled, but the allocator provides an unpoisoned
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// chunk. This is possible if CanPoisonMemory() was false for some
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// time, for example, due to flags()->start_disabled.
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// Anyway, poison the block before using it for anything else.
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uptr allocated_size = allocator.GetActuallyAllocatedSize(allocated);
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PoisonShadow((uptr)allocated, allocated_size, kAsanHeapLeftRedzoneMagic);
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}
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uptr alloc_beg = reinterpret_cast<uptr>(allocated);
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uptr alloc_end = alloc_beg + needed_size;
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uptr beg_plus_redzone = alloc_beg + rz_size;
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uptr user_beg = beg_plus_redzone;
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if (!IsAligned(user_beg, alignment))
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user_beg = RoundUpTo(user_beg, alignment);
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uptr user_end = user_beg + size;
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CHECK_LE(user_end, alloc_end);
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uptr chunk_beg = user_beg - kChunkHeaderSize;
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AsanChunk *m = reinterpret_cast<AsanChunk *>(chunk_beg);
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m->alloc_type = alloc_type;
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m->rz_log = rz_log;
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u32 alloc_tid = t ? t->tid() : 0;
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m->alloc_tid = alloc_tid;
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CHECK_EQ(alloc_tid, m->alloc_tid); // Does alloc_tid fit into the bitfield?
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m->free_tid = kInvalidTid;
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m->from_memalign = user_beg != beg_plus_redzone;
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if (alloc_beg != chunk_beg) {
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CHECK_LE(alloc_beg+ 2 * sizeof(uptr), chunk_beg);
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reinterpret_cast<uptr *>(alloc_beg)[0] = kAllocBegMagic;
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reinterpret_cast<uptr *>(alloc_beg)[1] = chunk_beg;
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}
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if (using_primary_allocator) {
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CHECK(size);
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m->user_requested_size = size;
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CHECK(allocator.FromPrimary(allocated));
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} else {
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CHECK(!allocator.FromPrimary(allocated));
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m->user_requested_size = SizeClassMap::kMaxSize;
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uptr *meta = reinterpret_cast<uptr *>(allocator.GetMetaData(allocated));
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meta[0] = size;
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meta[1] = chunk_beg;
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}
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m->alloc_context_id = StackDepotPut(*stack);
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uptr size_rounded_down_to_granularity =
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RoundDownTo(size, SHADOW_GRANULARITY);
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// Unpoison the bulk of the memory region.
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if (size_rounded_down_to_granularity)
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PoisonShadow(user_beg, size_rounded_down_to_granularity, 0);
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// Deal with the end of the region if size is not aligned to granularity.
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if (size != size_rounded_down_to_granularity && CanPoisonMemory()) {
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u8 *shadow =
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(u8 *)MemToShadow(user_beg + size_rounded_down_to_granularity);
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*shadow = fl.poison_partial ? (size & (SHADOW_GRANULARITY - 1)) : 0;
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}
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AsanStats &thread_stats = GetCurrentThreadStats();
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thread_stats.mallocs++;
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thread_stats.malloced += size;
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thread_stats.malloced_redzones += needed_size - size;
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if (needed_size > SizeClassMap::kMaxSize)
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thread_stats.malloc_large++;
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else
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thread_stats.malloced_by_size[SizeClassMap::ClassID(needed_size)]++;
|
|
|
|
void *res = reinterpret_cast<void *>(user_beg);
|
|
if (can_fill && fl.max_malloc_fill_size) {
|
|
uptr fill_size = Min(size, (uptr)fl.max_malloc_fill_size);
|
|
REAL(memset)(res, fl.malloc_fill_byte, fill_size);
|
|
}
|
|
#if CAN_SANITIZE_LEAKS
|
|
m->lsan_tag = __lsan::DisabledInThisThread() ? __lsan::kIgnored
|
|
: __lsan::kDirectlyLeaked;
|
|
#endif
|
|
// Must be the last mutation of metadata in this function.
|
|
atomic_store((atomic_uint8_t *)m, CHUNK_ALLOCATED, memory_order_release);
|
|
ASAN_MALLOC_HOOK(res, size);
|
|
return res;
|
|
}
|
|
|
|
// Set quarantine flag if chunk is allocated, issue ASan error report on
|
|
// available and quarantined chunks. Return true on success, false otherwise.
|
|
bool AtomicallySetQuarantineFlagIfAllocated(AsanChunk *m, void *ptr,
|
|
BufferedStackTrace *stack) {
|
|
u8 old_chunk_state = CHUNK_ALLOCATED;
|
|
// Flip the chunk_state atomically to avoid race on double-free.
|
|
if (!atomic_compare_exchange_strong((atomic_uint8_t *)m, &old_chunk_state,
|
|
CHUNK_QUARANTINE,
|
|
memory_order_acquire)) {
|
|
ReportInvalidFree(ptr, old_chunk_state, stack);
|
|
// It's not safe to push a chunk in quarantine on invalid free.
|
|
return false;
|
|
}
|
|
CHECK_EQ(CHUNK_ALLOCATED, old_chunk_state);
|
|
return true;
|
|
}
|
|
|
|
// Expects the chunk to already be marked as quarantined by using
|
|
// AtomicallySetQuarantineFlagIfAllocated.
|
|
void QuarantineChunk(AsanChunk *m, void *ptr, BufferedStackTrace *stack,
|
|
AllocType alloc_type) {
|
|
CHECK_EQ(m->chunk_state, CHUNK_QUARANTINE);
|
|
CHECK_GE(m->alloc_tid, 0);
|
|
if (SANITIZER_WORDSIZE == 64) // On 32-bits this resides in user area.
|
|
CHECK_EQ(m->free_tid, kInvalidTid);
|
|
AsanThread *t = GetCurrentThread();
|
|
m->free_tid = t ? t->tid() : 0;
|
|
m->free_context_id = StackDepotPut(*stack);
|
|
// Poison the region.
|
|
PoisonShadow(m->Beg(),
|
|
RoundUpTo(m->UsedSize(), SHADOW_GRANULARITY),
|
|
kAsanHeapFreeMagic);
|
|
|
|
AsanStats &thread_stats = GetCurrentThreadStats();
|
|
thread_stats.frees++;
|
|
thread_stats.freed += m->UsedSize();
|
|
|
|
// Push into quarantine.
|
|
if (t) {
|
|
AsanThreadLocalMallocStorage *ms = &t->malloc_storage();
|
|
AllocatorCache *ac = GetAllocatorCache(ms);
|
|
quarantine.Put(GetQuarantineCache(ms), QuarantineCallback(ac), m,
|
|
m->UsedSize());
|
|
} else {
|
|
SpinMutexLock l(&fallback_mutex);
|
|
AllocatorCache *ac = &fallback_allocator_cache;
|
|
quarantine.Put(&fallback_quarantine_cache, QuarantineCallback(ac), m,
|
|
m->UsedSize());
|
|
}
|
|
}
|
|
|
|
void Deallocate(void *ptr, uptr delete_size, BufferedStackTrace *stack,
|
|
AllocType alloc_type) {
|
|
uptr p = reinterpret_cast<uptr>(ptr);
|
|
if (p == 0) return;
|
|
|
|
uptr chunk_beg = p - kChunkHeaderSize;
|
|
AsanChunk *m = reinterpret_cast<AsanChunk *>(chunk_beg);
|
|
|
|
ASAN_FREE_HOOK(ptr);
|
|
// Must mark the chunk as quarantined before any changes to its metadata.
|
|
// Do not quarantine given chunk if we failed to set CHUNK_QUARANTINE flag.
|
|
if (!AtomicallySetQuarantineFlagIfAllocated(m, ptr, stack)) return;
|
|
|
|
if (m->alloc_type != alloc_type) {
|
|
if (atomic_load(&alloc_dealloc_mismatch, memory_order_acquire)) {
|
|
ReportAllocTypeMismatch((uptr)ptr, stack, (AllocType)m->alloc_type,
|
|
(AllocType)alloc_type);
|
|
}
|
|
}
|
|
|
|
if (delete_size && flags()->new_delete_type_mismatch &&
|
|
delete_size != m->UsedSize()) {
|
|
ReportNewDeleteSizeMismatch(p, m->UsedSize(), delete_size, stack);
|
|
}
|
|
|
|
QuarantineChunk(m, ptr, stack, alloc_type);
|
|
}
|
|
|
|
void *Reallocate(void *old_ptr, uptr new_size, BufferedStackTrace *stack) {
|
|
CHECK(old_ptr && new_size);
|
|
uptr p = reinterpret_cast<uptr>(old_ptr);
|
|
uptr chunk_beg = p - kChunkHeaderSize;
|
|
AsanChunk *m = reinterpret_cast<AsanChunk *>(chunk_beg);
|
|
|
|
AsanStats &thread_stats = GetCurrentThreadStats();
|
|
thread_stats.reallocs++;
|
|
thread_stats.realloced += new_size;
|
|
|
|
void *new_ptr = Allocate(new_size, 8, stack, FROM_MALLOC, true);
|
|
if (new_ptr) {
|
|
u8 chunk_state = m->chunk_state;
|
|
if (chunk_state != CHUNK_ALLOCATED)
|
|
ReportInvalidFree(old_ptr, chunk_state, stack);
|
|
CHECK_NE(REAL(memcpy), nullptr);
|
|
uptr memcpy_size = Min(new_size, m->UsedSize());
|
|
// If realloc() races with free(), we may start copying freed memory.
|
|
// However, we will report racy double-free later anyway.
|
|
REAL(memcpy)(new_ptr, old_ptr, memcpy_size);
|
|
Deallocate(old_ptr, 0, stack, FROM_MALLOC);
|
|
}
|
|
return new_ptr;
|
|
}
|
|
|
|
void *Calloc(uptr nmemb, uptr size, BufferedStackTrace *stack) {
|
|
if (CallocShouldReturnNullDueToOverflow(size, nmemb))
|
|
return allocator.ReturnNullOrDie();
|
|
void *ptr = Allocate(nmemb * size, 8, stack, FROM_MALLOC, false);
|
|
// If the memory comes from the secondary allocator no need to clear it
|
|
// as it comes directly from mmap.
|
|
if (ptr && allocator.FromPrimary(ptr))
|
|
REAL(memset)(ptr, 0, nmemb * size);
|
|
return ptr;
|
|
}
|
|
|
|
void ReportInvalidFree(void *ptr, u8 chunk_state, BufferedStackTrace *stack) {
|
|
if (chunk_state == CHUNK_QUARANTINE)
|
|
ReportDoubleFree((uptr)ptr, stack);
|
|
else
|
|
ReportFreeNotMalloced((uptr)ptr, stack);
|
|
}
|
|
|
|
void CommitBack(AsanThreadLocalMallocStorage *ms) {
|
|
AllocatorCache *ac = GetAllocatorCache(ms);
|
|
quarantine.Drain(GetQuarantineCache(ms), QuarantineCallback(ac));
|
|
allocator.SwallowCache(ac);
|
|
}
|
|
|
|
// -------------------------- Chunk lookup ----------------------
|
|
|
|
// Assumes alloc_beg == allocator.GetBlockBegin(alloc_beg).
|
|
AsanChunk *GetAsanChunk(void *alloc_beg) {
|
|
if (!alloc_beg) return nullptr;
|
|
if (!allocator.FromPrimary(alloc_beg)) {
|
|
uptr *meta = reinterpret_cast<uptr *>(allocator.GetMetaData(alloc_beg));
|
|
AsanChunk *m = reinterpret_cast<AsanChunk *>(meta[1]);
|
|
return m;
|
|
}
|
|
uptr *alloc_magic = reinterpret_cast<uptr *>(alloc_beg);
|
|
if (alloc_magic[0] == kAllocBegMagic)
|
|
return reinterpret_cast<AsanChunk *>(alloc_magic[1]);
|
|
return reinterpret_cast<AsanChunk *>(alloc_beg);
|
|
}
|
|
|
|
AsanChunk *GetAsanChunkByAddr(uptr p) {
|
|
void *alloc_beg = allocator.GetBlockBegin(reinterpret_cast<void *>(p));
|
|
return GetAsanChunk(alloc_beg);
|
|
}
|
|
|
|
// Allocator must be locked when this function is called.
|
|
AsanChunk *GetAsanChunkByAddrFastLocked(uptr p) {
|
|
void *alloc_beg =
|
|
allocator.GetBlockBeginFastLocked(reinterpret_cast<void *>(p));
|
|
return GetAsanChunk(alloc_beg);
|
|
}
|
|
|
|
uptr AllocationSize(uptr p) {
|
|
AsanChunk *m = GetAsanChunkByAddr(p);
|
|
if (!m) return 0;
|
|
if (m->chunk_state != CHUNK_ALLOCATED) return 0;
|
|
if (m->Beg() != p) return 0;
|
|
return m->UsedSize();
|
|
}
|
|
|
|
AsanChunkView FindHeapChunkByAddress(uptr addr) {
|
|
AsanChunk *m1 = GetAsanChunkByAddr(addr);
|
|
if (!m1) return AsanChunkView(m1);
|
|
sptr offset = 0;
|
|
if (AsanChunkView(m1).AddrIsAtLeft(addr, 1, &offset)) {
|
|
// The address is in the chunk's left redzone, so maybe it is actually
|
|
// a right buffer overflow from the other chunk to the left.
|
|
// Search a bit to the left to see if there is another chunk.
|
|
AsanChunk *m2 = nullptr;
|
|
for (uptr l = 1; l < GetPageSizeCached(); l++) {
|
|
m2 = GetAsanChunkByAddr(addr - l);
|
|
if (m2 == m1) continue; // Still the same chunk.
|
|
break;
|
|
}
|
|
if (m2 && AsanChunkView(m2).AddrIsAtRight(addr, 1, &offset))
|
|
m1 = ChooseChunk(addr, m2, m1);
|
|
}
|
|
return AsanChunkView(m1);
|
|
}
|
|
|
|
void PrintStats() {
|
|
allocator.PrintStats();
|
|
}
|
|
|
|
void ForceLock() {
|
|
allocator.ForceLock();
|
|
fallback_mutex.Lock();
|
|
}
|
|
|
|
void ForceUnlock() {
|
|
fallback_mutex.Unlock();
|
|
allocator.ForceUnlock();
|
|
}
|
|
};
|
|
|
|
static Allocator instance(LINKER_INITIALIZED);
|
|
|
|
static AsanAllocator &get_allocator() {
|
|
return instance.allocator;
|
|
}
|
|
|
|
bool AsanChunkView::IsValid() {
|
|
return chunk_ && chunk_->chunk_state != CHUNK_AVAILABLE;
|
|
}
|
|
bool AsanChunkView::IsAllocated() {
|
|
return chunk_ && chunk_->chunk_state == CHUNK_ALLOCATED;
|
|
}
|
|
uptr AsanChunkView::Beg() { return chunk_->Beg(); }
|
|
uptr AsanChunkView::End() { return Beg() + UsedSize(); }
|
|
uptr AsanChunkView::UsedSize() { return chunk_->UsedSize(); }
|
|
uptr AsanChunkView::AllocTid() { return chunk_->alloc_tid; }
|
|
uptr AsanChunkView::FreeTid() { return chunk_->free_tid; }
|
|
|
|
static StackTrace GetStackTraceFromId(u32 id) {
|
|
CHECK(id);
|
|
StackTrace res = StackDepotGet(id);
|
|
CHECK(res.trace);
|
|
return res;
|
|
}
|
|
|
|
u32 AsanChunkView::GetAllocStackId() { return chunk_->alloc_context_id; }
|
|
u32 AsanChunkView::GetFreeStackId() { return chunk_->free_context_id; }
|
|
|
|
StackTrace AsanChunkView::GetAllocStack() {
|
|
return GetStackTraceFromId(GetAllocStackId());
|
|
}
|
|
|
|
StackTrace AsanChunkView::GetFreeStack() {
|
|
return GetStackTraceFromId(GetFreeStackId());
|
|
}
|
|
|
|
void InitializeAllocator(const AllocatorOptions &options) {
|
|
instance.Initialize(options);
|
|
}
|
|
|
|
void ReInitializeAllocator(const AllocatorOptions &options) {
|
|
instance.ReInitialize(options);
|
|
}
|
|
|
|
void GetAllocatorOptions(AllocatorOptions *options) {
|
|
instance.GetOptions(options);
|
|
}
|
|
|
|
AsanChunkView FindHeapChunkByAddress(uptr addr) {
|
|
return instance.FindHeapChunkByAddress(addr);
|
|
}
|
|
|
|
void AsanThreadLocalMallocStorage::CommitBack() {
|
|
instance.CommitBack(this);
|
|
}
|
|
|
|
void PrintInternalAllocatorStats() {
|
|
instance.PrintStats();
|
|
}
|
|
|
|
void *asan_memalign(uptr alignment, uptr size, BufferedStackTrace *stack,
|
|
AllocType alloc_type) {
|
|
return instance.Allocate(size, alignment, stack, alloc_type, true);
|
|
}
|
|
|
|
void asan_free(void *ptr, BufferedStackTrace *stack, AllocType alloc_type) {
|
|
instance.Deallocate(ptr, 0, stack, alloc_type);
|
|
}
|
|
|
|
void asan_sized_free(void *ptr, uptr size, BufferedStackTrace *stack,
|
|
AllocType alloc_type) {
|
|
instance.Deallocate(ptr, size, stack, alloc_type);
|
|
}
|
|
|
|
void *asan_malloc(uptr size, BufferedStackTrace *stack) {
|
|
return instance.Allocate(size, 8, stack, FROM_MALLOC, true);
|
|
}
|
|
|
|
void *asan_calloc(uptr nmemb, uptr size, BufferedStackTrace *stack) {
|
|
return instance.Calloc(nmemb, size, stack);
|
|
}
|
|
|
|
void *asan_realloc(void *p, uptr size, BufferedStackTrace *stack) {
|
|
if (!p)
|
|
return instance.Allocate(size, 8, stack, FROM_MALLOC, true);
|
|
if (size == 0) {
|
|
instance.Deallocate(p, 0, stack, FROM_MALLOC);
|
|
return nullptr;
|
|
}
|
|
return instance.Reallocate(p, size, stack);
|
|
}
|
|
|
|
void *asan_valloc(uptr size, BufferedStackTrace *stack) {
|
|
return instance.Allocate(size, GetPageSizeCached(), stack, FROM_MALLOC, true);
|
|
}
|
|
|
|
void *asan_pvalloc(uptr size, BufferedStackTrace *stack) {
|
|
uptr PageSize = GetPageSizeCached();
|
|
size = RoundUpTo(size, PageSize);
|
|
if (size == 0) {
|
|
// pvalloc(0) should allocate one page.
|
|
size = PageSize;
|
|
}
|
|
return instance.Allocate(size, PageSize, stack, FROM_MALLOC, true);
|
|
}
|
|
|
|
int asan_posix_memalign(void **memptr, uptr alignment, uptr size,
|
|
BufferedStackTrace *stack) {
|
|
void *ptr = instance.Allocate(size, alignment, stack, FROM_MALLOC, true);
|
|
CHECK(IsAligned((uptr)ptr, alignment));
|
|
*memptr = ptr;
|
|
return 0;
|
|
}
|
|
|
|
uptr asan_malloc_usable_size(const void *ptr, uptr pc, uptr bp) {
|
|
if (!ptr) return 0;
|
|
uptr usable_size = instance.AllocationSize(reinterpret_cast<uptr>(ptr));
|
|
if (flags()->check_malloc_usable_size && (usable_size == 0)) {
|
|
GET_STACK_TRACE_FATAL(pc, bp);
|
|
ReportMallocUsableSizeNotOwned((uptr)ptr, &stack);
|
|
}
|
|
return usable_size;
|
|
}
|
|
|
|
uptr asan_mz_size(const void *ptr) {
|
|
return instance.AllocationSize(reinterpret_cast<uptr>(ptr));
|
|
}
|
|
|
|
void asan_mz_force_lock() {
|
|
instance.ForceLock();
|
|
}
|
|
|
|
void asan_mz_force_unlock() {
|
|
instance.ForceUnlock();
|
|
}
|
|
|
|
void AsanSoftRssLimitExceededCallback(bool exceeded) {
|
|
instance.allocator.SetRssLimitIsExceeded(exceeded);
|
|
}
|
|
|
|
} // namespace __asan
|
|
|
|
// --- Implementation of LSan-specific functions --- {{{1
|
|
namespace __lsan {
|
|
void LockAllocator() {
|
|
__asan::get_allocator().ForceLock();
|
|
}
|
|
|
|
void UnlockAllocator() {
|
|
__asan::get_allocator().ForceUnlock();
|
|
}
|
|
|
|
void GetAllocatorGlobalRange(uptr *begin, uptr *end) {
|
|
*begin = (uptr)&__asan::get_allocator();
|
|
*end = *begin + sizeof(__asan::get_allocator());
|
|
}
|
|
|
|
uptr PointsIntoChunk(void* p) {
|
|
uptr addr = reinterpret_cast<uptr>(p);
|
|
__asan::AsanChunk *m = __asan::instance.GetAsanChunkByAddrFastLocked(addr);
|
|
if (!m) return 0;
|
|
uptr chunk = m->Beg();
|
|
if (m->chunk_state != __asan::CHUNK_ALLOCATED)
|
|
return 0;
|
|
if (m->AddrIsInside(addr, /*locked_version=*/true))
|
|
return chunk;
|
|
if (IsSpecialCaseOfOperatorNew0(chunk, m->UsedSize(/*locked_version*/ true),
|
|
addr))
|
|
return chunk;
|
|
return 0;
|
|
}
|
|
|
|
uptr GetUserBegin(uptr chunk) {
|
|
__asan::AsanChunk *m = __asan::instance.GetAsanChunkByAddrFastLocked(chunk);
|
|
CHECK(m);
|
|
return m->Beg();
|
|
}
|
|
|
|
LsanMetadata::LsanMetadata(uptr chunk) {
|
|
metadata_ = reinterpret_cast<void *>(chunk - __asan::kChunkHeaderSize);
|
|
}
|
|
|
|
bool LsanMetadata::allocated() const {
|
|
__asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
|
|
return m->chunk_state == __asan::CHUNK_ALLOCATED;
|
|
}
|
|
|
|
ChunkTag LsanMetadata::tag() const {
|
|
__asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
|
|
return static_cast<ChunkTag>(m->lsan_tag);
|
|
}
|
|
|
|
void LsanMetadata::set_tag(ChunkTag value) {
|
|
__asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
|
|
m->lsan_tag = value;
|
|
}
|
|
|
|
uptr LsanMetadata::requested_size() const {
|
|
__asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
|
|
return m->UsedSize(/*locked_version=*/true);
|
|
}
|
|
|
|
u32 LsanMetadata::stack_trace_id() const {
|
|
__asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
|
|
return m->alloc_context_id;
|
|
}
|
|
|
|
void ForEachChunk(ForEachChunkCallback callback, void *arg) {
|
|
__asan::get_allocator().ForEachChunk(callback, arg);
|
|
}
|
|
|
|
IgnoreObjectResult IgnoreObjectLocked(const void *p) {
|
|
uptr addr = reinterpret_cast<uptr>(p);
|
|
__asan::AsanChunk *m = __asan::instance.GetAsanChunkByAddr(addr);
|
|
if (!m) return kIgnoreObjectInvalid;
|
|
if ((m->chunk_state == __asan::CHUNK_ALLOCATED) && m->AddrIsInside(addr)) {
|
|
if (m->lsan_tag == kIgnored)
|
|
return kIgnoreObjectAlreadyIgnored;
|
|
m->lsan_tag = __lsan::kIgnored;
|
|
return kIgnoreObjectSuccess;
|
|
} else {
|
|
return kIgnoreObjectInvalid;
|
|
}
|
|
}
|
|
} // namespace __lsan
|
|
|
|
// ---------------------- Interface ---------------- {{{1
|
|
using namespace __asan; // NOLINT
|
|
|
|
// ASan allocator doesn't reserve extra bytes, so normally we would
|
|
// just return "size". We don't want to expose our redzone sizes, etc here.
|
|
uptr __sanitizer_get_estimated_allocated_size(uptr size) {
|
|
return size;
|
|
}
|
|
|
|
int __sanitizer_get_ownership(const void *p) {
|
|
uptr ptr = reinterpret_cast<uptr>(p);
|
|
return instance.AllocationSize(ptr) > 0;
|
|
}
|
|
|
|
uptr __sanitizer_get_allocated_size(const void *p) {
|
|
if (!p) return 0;
|
|
uptr ptr = reinterpret_cast<uptr>(p);
|
|
uptr allocated_size = instance.AllocationSize(ptr);
|
|
// Die if p is not malloced or if it is already freed.
|
|
if (allocated_size == 0) {
|
|
GET_STACK_TRACE_FATAL_HERE;
|
|
ReportSanitizerGetAllocatedSizeNotOwned(ptr, &stack);
|
|
}
|
|
return allocated_size;
|
|
}
|
|
|
|
#if !SANITIZER_SUPPORTS_WEAK_HOOKS
|
|
// Provide default (no-op) implementation of malloc hooks.
|
|
extern "C" {
|
|
SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
|
|
void __sanitizer_malloc_hook(void *ptr, uptr size) {
|
|
(void)ptr;
|
|
(void)size;
|
|
}
|
|
SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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void __sanitizer_free_hook(void *ptr) {
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(void)ptr;
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}
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} // extern "C"
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#endif
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