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[FREELDR]: The hack to set pages from 0x100 to 0x1FF as busy so that the heap allocator wouldn't use them always restored the pages back to Free (since they usually were free on x86). However, if the pages were already being used in the first place, this made them appear free and corrupted existing memory. Fixed the hack so that it restores the previous state of the memory pages.

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svn path=/trunk/; revision=45517
This commit is contained in:
Sir Richard 2010-02-09 02:22:08 +00:00
parent f44cf3f702
commit 62cb7586f3
1 changed files with 5 additions and 2 deletions
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7
reactos/boot/freeldr/freeldr/mm/meminit.c
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@ -102,8 +102,11 @@ VOID MmInitializeHeap(PVOID PageLookupTable)
{
ULONG PagesNeeded;
ULONG HeapStart;
MEMORY_TYPE Type;
PPAGE_LOOKUP_TABLE_ITEM RealPageLookupTable = (PPAGE_LOOKUP_TABLE_ITEM)PageLookupTable;
// HACK: Make it so it doesn't overlap kernel space
Type = RealPageLookupTable[0x100].PageAllocated;
MmMarkPagesInLookupTable(PageLookupTableAddress, 0x100, 0xFF, LoaderSystemCode);
// Find contigious memory block for HEAP:STACK
@ -111,7 +114,7 @@ VOID MmInitializeHeap(PVOID PageLookupTable)
HeapStart = MmFindAvailablePages(PageLookupTable, TotalPagesInLookupTable, PagesNeeded, FALSE);
// Unapply the hack
MmMarkPagesInLookupTable(PageLookupTableAddress, 0x100, 0xFF, LoaderFree);
MmMarkPagesInLookupTable(PageLookupTableAddress, 0x100, 0xFF, Type);
if (HeapStart == 0)
{