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Fixed some edge cases in write-past-end detection

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This commit is contained in:
Brian Fiete 2022-06-02 15:01:02 -07:00
parent fd92b4ba93
commit 53376f3861
2 changed files with 3 additions and 2 deletions
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3
BeefRT/dbg/gc.cpp
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@ -599,6 +599,7 @@ void* BfObjectAllocate(intptr size, bf::System::Type* objType)
result = BF_do_malloc_pages(ThreadCache::GetCache(), totalSize);
}
BF_ASSERT(totalSize - size <= kPageSize);
*(uint16*)((uint8*)result + size) = 0xBFBF;
*(uint16*)((uint8*)result + totalSize - 2) = totalSize - size;
@ -974,7 +975,7 @@ void BFGC::ObjectDeleteRequested(bf::System::Object* obj)
int sizeOffset = *(uint16*)((uint8*)obj + allocSize - 2);
int requestedSize = allocSize - sizeOffset;
if ((sizeOffset < 4) || (sizeOffset >= allocSize) || (sizeOffset >= kPageSize) ||
if ((sizeOffset < 4) || (sizeOffset >= allocSize) || (sizeOffset > kPageSize) ||
(*(uint16*)((uint8*)obj + requestedSize) != 0xBFBF))
{
Beefy::String err = Beefy::StrFormat("Memory deallocation detected write-past-end error in %d-byte object allocation at 0x%@", requestedSize, obj);

2
BeefRT/dbg/gc_raw.cpp
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@ -632,7 +632,7 @@ void BfRawFree(void* ptr)
}
int markOffset = *markOffsetPtr;
if ((markOffset < 2) || (markOffset >= allocSize) || (markOffset >= kPageSize) ||
if ((markOffset < 2) || (markOffset >= allocSize) || (markOffset > kPageSize + 2) ||
(*(uint16*)((uint8*)markOffsetPtr - markOffset) != 0xBFBF))
{
int requestedSize = (uint8*)markOffsetPtr - (uint8*)ptr - markOffset;