forked from OSchip/llvm-project
407 lines
14 KiB
C++
407 lines
14 KiB
C++
//===-- hwasan_allocator.cpp ------------------------ ---------------------===//
|
|
//
|
|
// 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 HWAddressSanitizer.
|
|
//
|
|
// HWAddressSanitizer allocator.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "sanitizer_common/sanitizer_atomic.h"
|
|
#include "sanitizer_common/sanitizer_errno.h"
|
|
#include "sanitizer_common/sanitizer_stackdepot.h"
|
|
#include "hwasan.h"
|
|
#include "hwasan_allocator.h"
|
|
#include "hwasan_checks.h"
|
|
#include "hwasan_mapping.h"
|
|
#include "hwasan_malloc_bisect.h"
|
|
#include "hwasan_thread.h"
|
|
#include "hwasan_report.h"
|
|
|
|
namespace __hwasan {
|
|
|
|
static Allocator allocator;
|
|
static AllocatorCache fallback_allocator_cache;
|
|
static SpinMutex fallback_mutex;
|
|
static atomic_uint8_t hwasan_allocator_tagging_enabled;
|
|
|
|
static const tag_t kFallbackAllocTag = 0xBB;
|
|
static const tag_t kFallbackFreeTag = 0xBC;
|
|
|
|
enum RightAlignMode {
|
|
kRightAlignNever,
|
|
kRightAlignSometimes,
|
|
kRightAlignAlways
|
|
};
|
|
|
|
// Initialized in HwasanAllocatorInit, an never changed.
|
|
static ALIGNED(16) u8 tail_magic[kShadowAlignment - 1];
|
|
|
|
bool HwasanChunkView::IsAllocated() const {
|
|
return metadata_ && metadata_->alloc_context_id && metadata_->requested_size;
|
|
}
|
|
|
|
// Aligns the 'addr' right to the granule boundary.
|
|
static uptr AlignRight(uptr addr, uptr requested_size) {
|
|
uptr tail_size = requested_size % kShadowAlignment;
|
|
if (!tail_size) return addr;
|
|
return addr + kShadowAlignment - tail_size;
|
|
}
|
|
|
|
uptr HwasanChunkView::Beg() const {
|
|
if (metadata_ && metadata_->right_aligned)
|
|
return AlignRight(block_, metadata_->requested_size);
|
|
return block_;
|
|
}
|
|
uptr HwasanChunkView::End() const {
|
|
return Beg() + UsedSize();
|
|
}
|
|
uptr HwasanChunkView::UsedSize() const {
|
|
return metadata_->requested_size;
|
|
}
|
|
u32 HwasanChunkView::GetAllocStackId() const {
|
|
return metadata_->alloc_context_id;
|
|
}
|
|
|
|
uptr HwasanChunkView::ActualSize() const {
|
|
return allocator.GetActuallyAllocatedSize(reinterpret_cast<void *>(block_));
|
|
}
|
|
|
|
bool HwasanChunkView::FromSmallHeap() const {
|
|
return allocator.FromPrimary(reinterpret_cast<void *>(block_));
|
|
}
|
|
|
|
void GetAllocatorStats(AllocatorStatCounters s) {
|
|
allocator.GetStats(s);
|
|
}
|
|
|
|
void HwasanAllocatorInit() {
|
|
atomic_store_relaxed(&hwasan_allocator_tagging_enabled,
|
|
!flags()->disable_allocator_tagging);
|
|
SetAllocatorMayReturnNull(common_flags()->allocator_may_return_null);
|
|
allocator.Init(common_flags()->allocator_release_to_os_interval_ms);
|
|
for (uptr i = 0; i < sizeof(tail_magic); i++)
|
|
tail_magic[i] = GetCurrentThread()->GenerateRandomTag();
|
|
}
|
|
|
|
void AllocatorSwallowThreadLocalCache(AllocatorCache *cache) {
|
|
allocator.SwallowCache(cache);
|
|
}
|
|
|
|
static uptr TaggedSize(uptr size) {
|
|
if (!size) size = 1;
|
|
uptr new_size = RoundUpTo(size, kShadowAlignment);
|
|
CHECK_GE(new_size, size);
|
|
return new_size;
|
|
}
|
|
|
|
static void *HwasanAllocate(StackTrace *stack, uptr orig_size, uptr alignment,
|
|
bool zeroise) {
|
|
if (orig_size > kMaxAllowedMallocSize) {
|
|
if (AllocatorMayReturnNull()) {
|
|
Report("WARNING: HWAddressSanitizer failed to allocate 0x%zx bytes\n",
|
|
orig_size);
|
|
return nullptr;
|
|
}
|
|
ReportAllocationSizeTooBig(orig_size, kMaxAllowedMallocSize, stack);
|
|
}
|
|
|
|
alignment = Max(alignment, kShadowAlignment);
|
|
uptr size = TaggedSize(orig_size);
|
|
Thread *t = GetCurrentThread();
|
|
void *allocated;
|
|
if (t) {
|
|
allocated = allocator.Allocate(t->allocator_cache(), size, alignment);
|
|
} else {
|
|
SpinMutexLock l(&fallback_mutex);
|
|
AllocatorCache *cache = &fallback_allocator_cache;
|
|
allocated = allocator.Allocate(cache, size, alignment);
|
|
}
|
|
if (UNLIKELY(!allocated)) {
|
|
SetAllocatorOutOfMemory();
|
|
if (AllocatorMayReturnNull())
|
|
return nullptr;
|
|
ReportOutOfMemory(size, stack);
|
|
}
|
|
Metadata *meta =
|
|
reinterpret_cast<Metadata *>(allocator.GetMetaData(allocated));
|
|
meta->requested_size = static_cast<u32>(orig_size);
|
|
meta->alloc_context_id = StackDepotPut(*stack);
|
|
meta->right_aligned = false;
|
|
if (zeroise) {
|
|
internal_memset(allocated, 0, size);
|
|
} else if (flags()->max_malloc_fill_size > 0) {
|
|
uptr fill_size = Min(size, (uptr)flags()->max_malloc_fill_size);
|
|
internal_memset(allocated, flags()->malloc_fill_byte, fill_size);
|
|
}
|
|
if (size != orig_size) {
|
|
internal_memcpy(reinterpret_cast<u8 *>(allocated) + orig_size, tail_magic,
|
|
size - orig_size - 1);
|
|
}
|
|
|
|
void *user_ptr = allocated;
|
|
// Tagging can only be skipped when both tag_in_malloc and tag_in_free are
|
|
// false. When tag_in_malloc = false and tag_in_free = true malloc needs to
|
|
// retag to 0.
|
|
if ((flags()->tag_in_malloc || flags()->tag_in_free) &&
|
|
atomic_load_relaxed(&hwasan_allocator_tagging_enabled)) {
|
|
if (flags()->tag_in_malloc && malloc_bisect(stack, orig_size)) {
|
|
tag_t tag = t ? t->GenerateRandomTag() : kFallbackAllocTag;
|
|
uptr tag_size = orig_size ? orig_size : 1;
|
|
uptr full_granule_size = RoundDownTo(tag_size, kShadowAlignment);
|
|
user_ptr =
|
|
(void *)TagMemoryAligned((uptr)user_ptr, full_granule_size, tag);
|
|
if (full_granule_size != tag_size) {
|
|
u8 *short_granule =
|
|
reinterpret_cast<u8 *>(allocated) + full_granule_size;
|
|
TagMemoryAligned((uptr)short_granule, kShadowAlignment,
|
|
tag_size % kShadowAlignment);
|
|
short_granule[kShadowAlignment - 1] = tag;
|
|
}
|
|
} else {
|
|
user_ptr = (void *)TagMemoryAligned((uptr)user_ptr, size, 0);
|
|
}
|
|
}
|
|
|
|
HWASAN_MALLOC_HOOK(user_ptr, size);
|
|
return user_ptr;
|
|
}
|
|
|
|
static bool PointerAndMemoryTagsMatch(void *tagged_ptr) {
|
|
CHECK(tagged_ptr);
|
|
uptr tagged_uptr = reinterpret_cast<uptr>(tagged_ptr);
|
|
tag_t mem_tag = *reinterpret_cast<tag_t *>(
|
|
MemToShadow(reinterpret_cast<uptr>(UntagPtr(tagged_ptr))));
|
|
return PossiblyShortTagMatches(mem_tag, tagged_uptr, 1);
|
|
}
|
|
|
|
static void HwasanDeallocate(StackTrace *stack, void *tagged_ptr) {
|
|
CHECK(tagged_ptr);
|
|
HWASAN_FREE_HOOK(tagged_ptr);
|
|
|
|
if (!PointerAndMemoryTagsMatch(tagged_ptr))
|
|
ReportInvalidFree(stack, reinterpret_cast<uptr>(tagged_ptr));
|
|
|
|
void *untagged_ptr = UntagPtr(tagged_ptr);
|
|
void *aligned_ptr = reinterpret_cast<void *>(
|
|
RoundDownTo(reinterpret_cast<uptr>(untagged_ptr), kShadowAlignment));
|
|
Metadata *meta =
|
|
reinterpret_cast<Metadata *>(allocator.GetMetaData(aligned_ptr));
|
|
uptr orig_size = meta->requested_size;
|
|
u32 free_context_id = StackDepotPut(*stack);
|
|
u32 alloc_context_id = meta->alloc_context_id;
|
|
|
|
// Check tail magic.
|
|
uptr tagged_size = TaggedSize(orig_size);
|
|
if (flags()->free_checks_tail_magic && orig_size &&
|
|
tagged_size != orig_size) {
|
|
uptr tail_size = tagged_size - orig_size - 1;
|
|
CHECK_LT(tail_size, kShadowAlignment);
|
|
void *tail_beg = reinterpret_cast<void *>(
|
|
reinterpret_cast<uptr>(aligned_ptr) + orig_size);
|
|
if (tail_size && internal_memcmp(tail_beg, tail_magic, tail_size))
|
|
ReportTailOverwritten(stack, reinterpret_cast<uptr>(tagged_ptr),
|
|
orig_size, tail_magic);
|
|
}
|
|
|
|
meta->requested_size = 0;
|
|
meta->alloc_context_id = 0;
|
|
// This memory will not be reused by anyone else, so we are free to keep it
|
|
// poisoned.
|
|
Thread *t = GetCurrentThread();
|
|
if (flags()->max_free_fill_size > 0) {
|
|
uptr fill_size =
|
|
Min(TaggedSize(orig_size), (uptr)flags()->max_free_fill_size);
|
|
internal_memset(aligned_ptr, flags()->free_fill_byte, fill_size);
|
|
}
|
|
if (flags()->tag_in_free && malloc_bisect(stack, 0) &&
|
|
atomic_load_relaxed(&hwasan_allocator_tagging_enabled))
|
|
TagMemoryAligned(reinterpret_cast<uptr>(aligned_ptr), TaggedSize(orig_size),
|
|
t ? t->GenerateRandomTag() : kFallbackFreeTag);
|
|
if (t) {
|
|
allocator.Deallocate(t->allocator_cache(), aligned_ptr);
|
|
if (auto *ha = t->heap_allocations())
|
|
ha->push({reinterpret_cast<uptr>(tagged_ptr), alloc_context_id,
|
|
free_context_id, static_cast<u32>(orig_size)});
|
|
} else {
|
|
SpinMutexLock l(&fallback_mutex);
|
|
AllocatorCache *cache = &fallback_allocator_cache;
|
|
allocator.Deallocate(cache, aligned_ptr);
|
|
}
|
|
}
|
|
|
|
static void *HwasanReallocate(StackTrace *stack, void *tagged_ptr_old,
|
|
uptr new_size, uptr alignment) {
|
|
if (!PointerAndMemoryTagsMatch(tagged_ptr_old))
|
|
ReportInvalidFree(stack, reinterpret_cast<uptr>(tagged_ptr_old));
|
|
|
|
void *tagged_ptr_new =
|
|
HwasanAllocate(stack, new_size, alignment, false /*zeroise*/);
|
|
if (tagged_ptr_old && tagged_ptr_new) {
|
|
void *untagged_ptr_old = UntagPtr(tagged_ptr_old);
|
|
Metadata *meta =
|
|
reinterpret_cast<Metadata *>(allocator.GetMetaData(untagged_ptr_old));
|
|
internal_memcpy(UntagPtr(tagged_ptr_new), untagged_ptr_old,
|
|
Min(new_size, static_cast<uptr>(meta->requested_size)));
|
|
HwasanDeallocate(stack, tagged_ptr_old);
|
|
}
|
|
return tagged_ptr_new;
|
|
}
|
|
|
|
static void *HwasanCalloc(StackTrace *stack, uptr nmemb, uptr size) {
|
|
if (UNLIKELY(CheckForCallocOverflow(size, nmemb))) {
|
|
if (AllocatorMayReturnNull())
|
|
return nullptr;
|
|
ReportCallocOverflow(nmemb, size, stack);
|
|
}
|
|
return HwasanAllocate(stack, nmemb * size, sizeof(u64), true);
|
|
}
|
|
|
|
HwasanChunkView FindHeapChunkByAddress(uptr address) {
|
|
void *block = allocator.GetBlockBegin(reinterpret_cast<void*>(address));
|
|
if (!block)
|
|
return HwasanChunkView();
|
|
Metadata *metadata =
|
|
reinterpret_cast<Metadata*>(allocator.GetMetaData(block));
|
|
return HwasanChunkView(reinterpret_cast<uptr>(block), metadata);
|
|
}
|
|
|
|
static uptr AllocationSize(const void *tagged_ptr) {
|
|
const void *untagged_ptr = UntagPtr(tagged_ptr);
|
|
if (!untagged_ptr) return 0;
|
|
const void *beg = allocator.GetBlockBegin(untagged_ptr);
|
|
Metadata *b = (Metadata *)allocator.GetMetaData(untagged_ptr);
|
|
if (b->right_aligned) {
|
|
if (beg != reinterpret_cast<void *>(RoundDownTo(
|
|
reinterpret_cast<uptr>(untagged_ptr), kShadowAlignment)))
|
|
return 0;
|
|
} else {
|
|
if (beg != untagged_ptr) return 0;
|
|
}
|
|
return b->requested_size;
|
|
}
|
|
|
|
void *hwasan_malloc(uptr size, StackTrace *stack) {
|
|
return SetErrnoOnNull(HwasanAllocate(stack, size, sizeof(u64), false));
|
|
}
|
|
|
|
void *hwasan_calloc(uptr nmemb, uptr size, StackTrace *stack) {
|
|
return SetErrnoOnNull(HwasanCalloc(stack, nmemb, size));
|
|
}
|
|
|
|
void *hwasan_realloc(void *ptr, uptr size, StackTrace *stack) {
|
|
if (!ptr)
|
|
return SetErrnoOnNull(HwasanAllocate(stack, size, sizeof(u64), false));
|
|
if (size == 0) {
|
|
HwasanDeallocate(stack, ptr);
|
|
return nullptr;
|
|
}
|
|
return SetErrnoOnNull(HwasanReallocate(stack, ptr, size, sizeof(u64)));
|
|
}
|
|
|
|
void *hwasan_reallocarray(void *ptr, uptr nmemb, uptr size, StackTrace *stack) {
|
|
if (UNLIKELY(CheckForCallocOverflow(size, nmemb))) {
|
|
errno = errno_ENOMEM;
|
|
if (AllocatorMayReturnNull())
|
|
return nullptr;
|
|
ReportReallocArrayOverflow(nmemb, size, stack);
|
|
}
|
|
return hwasan_realloc(ptr, nmemb * size, stack);
|
|
}
|
|
|
|
void *hwasan_valloc(uptr size, StackTrace *stack) {
|
|
return SetErrnoOnNull(
|
|
HwasanAllocate(stack, size, GetPageSizeCached(), false));
|
|
}
|
|
|
|
void *hwasan_pvalloc(uptr size, StackTrace *stack) {
|
|
uptr PageSize = GetPageSizeCached();
|
|
if (UNLIKELY(CheckForPvallocOverflow(size, PageSize))) {
|
|
errno = errno_ENOMEM;
|
|
if (AllocatorMayReturnNull())
|
|
return nullptr;
|
|
ReportPvallocOverflow(size, stack);
|
|
}
|
|
// pvalloc(0) should allocate one page.
|
|
size = size ? RoundUpTo(size, PageSize) : PageSize;
|
|
return SetErrnoOnNull(HwasanAllocate(stack, size, PageSize, false));
|
|
}
|
|
|
|
void *hwasan_aligned_alloc(uptr alignment, uptr size, StackTrace *stack) {
|
|
if (UNLIKELY(!CheckAlignedAllocAlignmentAndSize(alignment, size))) {
|
|
errno = errno_EINVAL;
|
|
if (AllocatorMayReturnNull())
|
|
return nullptr;
|
|
ReportInvalidAlignedAllocAlignment(size, alignment, stack);
|
|
}
|
|
return SetErrnoOnNull(HwasanAllocate(stack, size, alignment, false));
|
|
}
|
|
|
|
void *hwasan_memalign(uptr alignment, uptr size, StackTrace *stack) {
|
|
if (UNLIKELY(!IsPowerOfTwo(alignment))) {
|
|
errno = errno_EINVAL;
|
|
if (AllocatorMayReturnNull())
|
|
return nullptr;
|
|
ReportInvalidAllocationAlignment(alignment, stack);
|
|
}
|
|
return SetErrnoOnNull(HwasanAllocate(stack, size, alignment, false));
|
|
}
|
|
|
|
int hwasan_posix_memalign(void **memptr, uptr alignment, uptr size,
|
|
StackTrace *stack) {
|
|
if (UNLIKELY(!CheckPosixMemalignAlignment(alignment))) {
|
|
if (AllocatorMayReturnNull())
|
|
return errno_EINVAL;
|
|
ReportInvalidPosixMemalignAlignment(alignment, stack);
|
|
}
|
|
void *ptr = HwasanAllocate(stack, size, alignment, false);
|
|
if (UNLIKELY(!ptr))
|
|
// OOM error is already taken care of by HwasanAllocate.
|
|
return errno_ENOMEM;
|
|
CHECK(IsAligned((uptr)ptr, alignment));
|
|
*(void **)UntagPtr(memptr) = ptr;
|
|
return 0;
|
|
}
|
|
|
|
void hwasan_free(void *ptr, StackTrace *stack) {
|
|
return HwasanDeallocate(stack, ptr);
|
|
}
|
|
|
|
} // namespace __hwasan
|
|
|
|
using namespace __hwasan;
|
|
|
|
void __hwasan_enable_allocator_tagging() {
|
|
atomic_store_relaxed(&hwasan_allocator_tagging_enabled, 1);
|
|
}
|
|
|
|
void __hwasan_disable_allocator_tagging() {
|
|
atomic_store_relaxed(&hwasan_allocator_tagging_enabled, 0);
|
|
}
|
|
|
|
uptr __sanitizer_get_current_allocated_bytes() {
|
|
uptr stats[AllocatorStatCount];
|
|
allocator.GetStats(stats);
|
|
return stats[AllocatorStatAllocated];
|
|
}
|
|
|
|
uptr __sanitizer_get_heap_size() {
|
|
uptr stats[AllocatorStatCount];
|
|
allocator.GetStats(stats);
|
|
return stats[AllocatorStatMapped];
|
|
}
|
|
|
|
uptr __sanitizer_get_free_bytes() { return 1; }
|
|
|
|
uptr __sanitizer_get_unmapped_bytes() { return 1; }
|
|
|
|
uptr __sanitizer_get_estimated_allocated_size(uptr size) { return size; }
|
|
|
|
int __sanitizer_get_ownership(const void *p) { return AllocationSize(p) != 0; }
|
|
|
|
uptr __sanitizer_get_allocated_size(const void *p) { return AllocationSize(p); }
|