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don't let VirtualProtect play with not committed memory

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svn path=/trunk/; revision=38932
This commit is contained in:
Christoph von Wittich 2009-01-19 10:27:59 +00:00
parent 2eb7079e6c
commit 23ef53ceff
1 changed files with 14 additions and 5 deletions
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19
reactos/ntoskrnl/mm/anonmem.c
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@ -1028,11 +1028,20 @@ MmProtectAnonMem(PMM_AVL_TABLE AddressSpace,
Region = MmFindRegion(MemoryArea->StartingAddress, Region = MmFindRegion(MemoryArea->StartingAddress,
&MemoryArea->Data.VirtualMemoryData.RegionListHead, &MemoryArea->Data.VirtualMemoryData.RegionListHead,
BaseAddress, NULL); BaseAddress, NULL);
*OldProtect = Region->Protect; if (Region->Type == MEM_COMMIT)
Status = MmAlterRegion(AddressSpace, MemoryArea->StartingAddress, {
&MemoryArea->Data.VirtualMemoryData.RegionListHead, /* FIXME: check if the whole range is committed
BaseAddress, Length, Region->Type, Protect, * before altering the memory */
MmModifyAttributes); *OldProtect = Region->Protect;
Status = MmAlterRegion(AddressSpace, MemoryArea->StartingAddress,
&MemoryArea->Data.VirtualMemoryData.RegionListHead,
BaseAddress, Length, Region->Type, Protect,
MmModifyAttributes);
}
else
{
Status = STATUS_NOT_COMMITTED;
}
return(Status); return(Status);
} }