228 lines
7.4 KiB
C++
228 lines
7.4 KiB
C++
//===-- msan_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 MemorySanitizer.
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//
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// MemorySanitizer allocator.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_allocator.h"
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#include "sanitizer_common/sanitizer_allocator_interface.h"
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#include "msan.h"
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#include "msan_allocator.h"
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#include "msan_origin.h"
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#include "msan_thread.h"
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#include "msan_poisoning.h"
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namespace __msan {
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struct Metadata {
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uptr requested_size;
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};
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struct MsanMapUnmapCallback {
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void OnMap(uptr p, uptr size) const {}
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void OnUnmap(uptr p, uptr size) const {
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__msan_unpoison((void *)p, size);
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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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FlushUnneededShadowMemory(MEM_TO_SHADOW(p), size);
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if (__msan_get_track_origins())
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FlushUnneededShadowMemory(MEM_TO_ORIGIN(p), size);
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}
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};
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#if defined(__mips64)
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static const uptr kMaxAllowedMallocSize = 2UL << 30;
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static const uptr kRegionSizeLog = 20;
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static const uptr kNumRegions = SANITIZER_MMAP_RANGE_SIZE >> kRegionSizeLog;
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typedef TwoLevelByteMap<(kNumRegions >> 12), 1 << 12> ByteMap;
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typedef CompactSizeClassMap SizeClassMap;
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typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE, sizeof(Metadata),
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SizeClassMap, kRegionSizeLog, ByteMap,
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MsanMapUnmapCallback> PrimaryAllocator;
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#elif defined(__x86_64__)
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static const uptr kAllocatorSpace = 0x600000000000ULL;
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static const uptr kAllocatorSize = 0x80000000000; // 8T.
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static const uptr kMetadataSize = sizeof(Metadata);
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static const uptr kMaxAllowedMallocSize = 8UL << 30;
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typedef SizeClassAllocator64<kAllocatorSpace, kAllocatorSize, kMetadataSize,
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DefaultSizeClassMap,
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MsanMapUnmapCallback> PrimaryAllocator;
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#endif
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typedef SizeClassAllocatorLocalCache<PrimaryAllocator> AllocatorCache;
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typedef LargeMmapAllocator<MsanMapUnmapCallback> SecondaryAllocator;
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typedef CombinedAllocator<PrimaryAllocator, AllocatorCache,
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SecondaryAllocator> Allocator;
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static Allocator allocator;
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static AllocatorCache fallback_allocator_cache;
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static SpinMutex fallback_mutex;
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static int inited = 0;
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static inline void Init() {
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if (inited) return;
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__msan_init();
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inited = true; // this must happen before any threads are created.
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allocator.Init(common_flags()->allocator_may_return_null);
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}
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AllocatorCache *GetAllocatorCache(MsanThreadLocalMallocStorage *ms) {
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CHECK(ms);
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CHECK_LE(sizeof(AllocatorCache), sizeof(ms->allocator_cache));
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return reinterpret_cast<AllocatorCache *>(ms->allocator_cache);
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}
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void MsanThreadLocalMallocStorage::CommitBack() {
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allocator.SwallowCache(GetAllocatorCache(this));
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}
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static void *MsanAllocate(StackTrace *stack, uptr size, uptr alignment,
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bool zeroise) {
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Init();
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if (size > kMaxAllowedMallocSize) {
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Report("WARNING: MemorySanitizer failed to allocate %p bytes\n",
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(void *)size);
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return allocator.ReturnNullOrDie();
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}
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MsanThread *t = GetCurrentThread();
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void *allocated;
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if (t) {
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AllocatorCache *cache = GetAllocatorCache(&t->malloc_storage());
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allocated = allocator.Allocate(cache, size, alignment, false);
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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 = allocator.Allocate(cache, size, alignment, false);
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}
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Metadata *meta =
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reinterpret_cast<Metadata *>(allocator.GetMetaData(allocated));
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meta->requested_size = size;
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if (zeroise) {
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__msan_clear_and_unpoison(allocated, size);
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} else if (flags()->poison_in_malloc) {
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__msan_poison(allocated, size);
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if (__msan_get_track_origins()) {
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stack->tag = StackTrace::TAG_ALLOC;
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Origin o = Origin::CreateHeapOrigin(stack);
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__msan_set_origin(allocated, size, o.raw_id());
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}
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}
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MSAN_MALLOC_HOOK(allocated, size);
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return allocated;
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}
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void MsanDeallocate(StackTrace *stack, void *p) {
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CHECK(p);
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Init();
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MSAN_FREE_HOOK(p);
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Metadata *meta = reinterpret_cast<Metadata *>(allocator.GetMetaData(p));
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uptr size = meta->requested_size;
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meta->requested_size = 0;
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// This memory will not be reused by anyone else, so we are free to keep it
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// poisoned.
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if (flags()->poison_in_free) {
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__msan_poison(p, size);
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if (__msan_get_track_origins()) {
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stack->tag = StackTrace::TAG_DEALLOC;
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Origin o = Origin::CreateHeapOrigin(stack);
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__msan_set_origin(p, size, o.raw_id());
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}
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}
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MsanThread *t = GetCurrentThread();
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if (t) {
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AllocatorCache *cache = GetAllocatorCache(&t->malloc_storage());
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allocator.Deallocate(cache, p);
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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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allocator.Deallocate(cache, p);
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}
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}
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void *MsanCalloc(StackTrace *stack, uptr nmemb, uptr size) {
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Init();
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if (CallocShouldReturnNullDueToOverflow(size, nmemb))
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return allocator.ReturnNullOrDie();
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return MsanReallocate(stack, 0, nmemb * size, sizeof(u64), true);
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}
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void *MsanReallocate(StackTrace *stack, void *old_p, uptr new_size,
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uptr alignment, bool zeroise) {
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if (!old_p)
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return MsanAllocate(stack, new_size, alignment, zeroise);
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if (!new_size) {
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MsanDeallocate(stack, old_p);
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return 0;
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}
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Metadata *meta = reinterpret_cast<Metadata*>(allocator.GetMetaData(old_p));
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uptr old_size = meta->requested_size;
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uptr actually_allocated_size = allocator.GetActuallyAllocatedSize(old_p);
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if (new_size <= actually_allocated_size) {
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// We are not reallocating here.
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meta->requested_size = new_size;
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if (new_size > old_size) {
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if (zeroise) {
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__msan_clear_and_unpoison((char *)old_p + old_size,
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new_size - old_size);
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} else if (flags()->poison_in_malloc) {
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stack->tag = StackTrace::TAG_ALLOC;
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PoisonMemory((char *)old_p + old_size, new_size - old_size, stack);
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}
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}
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return old_p;
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}
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uptr memcpy_size = Min(new_size, old_size);
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void *new_p = MsanAllocate(stack, new_size, alignment, zeroise);
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// Printf("realloc: old_size %zd new_size %zd\n", old_size, new_size);
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if (new_p) {
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CopyMemory(new_p, old_p, memcpy_size, stack);
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MsanDeallocate(stack, old_p);
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}
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return new_p;
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}
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static uptr AllocationSize(const void *p) {
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if (p == 0) return 0;
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const void *beg = allocator.GetBlockBegin(p);
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if (beg != p) return 0;
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Metadata *b = (Metadata *)allocator.GetMetaData(p);
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return b->requested_size;
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}
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} // namespace __msan
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using namespace __msan;
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uptr __sanitizer_get_current_allocated_bytes() {
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uptr stats[AllocatorStatCount];
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allocator.GetStats(stats);
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return stats[AllocatorStatAllocated];
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}
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uptr __sanitizer_get_heap_size() {
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uptr stats[AllocatorStatCount];
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allocator.GetStats(stats);
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return stats[AllocatorStatMapped];
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}
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uptr __sanitizer_get_free_bytes() { return 1; }
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uptr __sanitizer_get_unmapped_bytes() { return 1; }
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uptr __sanitizer_get_estimated_allocated_size(uptr size) { return size; }
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int __sanitizer_get_ownership(const void *p) { return AllocationSize(p) != 0; }
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uptr __sanitizer_get_allocated_size(const void *p) { return AllocationSize(p); }
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