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- Make debug pool return 8-bytes aligned pointers. The padding area (up to 7 bytes) is not being checked for overruns now. ReactOS fully boots and works with this change and a debug pool.

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svn path=/trunk/; revision=40750
This commit is contained in:
Aleksey Bragin 2009-04-30 09:09:03 +00:00
parent 1428ee97e9
commit 19b430466c
1 changed files with 20 additions and 5 deletions
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25
reactos/ntoskrnl/mm/dbgpool.c
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@ -24,12 +24,23 @@ BOOLEAN
NTAPI
ExpIsPoolTagDebuggable(ULONG Tag)
{
#if 0
if (Tag == TAG('C', 'a', 'l', 'l')) return FALSE;
if (Tag == TAG('D', 'r', 'i', 'v')) return FALSE;
if (Tag == TAG('D', 'e', 'v', 'i')) return FALSE;
if (Tag == TAG('A', 'd', 'a', 'p')) return FALSE;
return FALSE;//TRUE;
if (Tag == TAG('S', 'e', 'S', 'd')) return FALSE;
if (Tag == TAG('O', 'b', 'D', 'i')) return FALSE;
if (Tag == TAG('O', 'b', 'N', 'm')) return FALSE;
if (Tag == TAG('O', 'b', 'N', 'D')) return FALSE;
if (Tag == TAG('O', 'b', 't', 'b')) return FALSE;
if (Tag == TAG('O', 'b', 'S', 'c')) return FALSE;
//if (Tag == TAG('S', 'e', 'S', 'i')) return FALSE;
//if (Tag == TAG('S', 'e', 'A', 'c')) return FALSE;
#endif
return TRUE;
}
@ -37,12 +48,16 @@ PVOID
NTAPI
ExpAllocateDebugPool(POOL_TYPE Type, ULONG Size, ULONG Tag, PVOID Caller, BOOLEAN EndOfPage)
{
ULONG UserSize = Size + sizeof(EI_WHOLE_PAGE_HEADER);
ULONG TotalSize = UserSize + 2*PAGE_SIZE;
ULONG UserSize, TotalSize, AlignedSize;
ULONG_PTR UserData, GuardArea;
PEI_WHOLE_PAGE_HEADER Header;
ULONG_PTR Buffer;
/* Calculate sizes */
AlignedSize = ROUND_UP(Size, MM_POOL_ALIGNMENT);
UserSize = AlignedSize + sizeof(EI_WHOLE_PAGE_HEADER);
TotalSize = UserSize + 2*PAGE_SIZE;
/* Right now we support only end-of-page allocations */
ASSERT(EndOfPage);
@ -70,13 +85,13 @@ ExpAllocateDebugPool(POOL_TYPE Type, ULONG Size, ULONG Tag, PVOID Caller, BOOLEA
GuardArea = PAGE_ROUND_DOWN(Buffer + TotalSize - PAGE_SIZE + 1);
/* Calculate user data and header pointers */
UserData = GuardArea - Size;
UserData = GuardArea - AlignedSize;
Header = (PEI_WHOLE_PAGE_HEADER)(UserData - sizeof(EI_WHOLE_PAGE_HEADER));
/* Fill out the header */
Header->ActualAddress = (PVOID)Buffer;
Header->Tag = Tag;
Header->Size = Size;
Header->Size = AlignedSize;
/* Protect the guard page */
MmSetPageProtect(NULL, (PVOID)GuardArea, PAGE_NOACCESS);