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- Check if a requested fixed address range is valid for the address space.

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- This fixes bug #34.

svn path=/trunk/; revision=6489
This commit is contained in:
Hartmut Birr 2003-11-01 12:59:38 +00:00
parent 06f5aba298
commit d8042fe330
1 changed files with 12 additions and 0 deletions
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12
reactos/ntoskrnl/mm/marea.c
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@ -519,6 +519,18 @@ NTSTATUS MmCreateMemoryArea(PEPROCESS Process,
{ {
tmpLength = (ULONG)*BaseAddress + Length - PAGE_ROUND_DOWN((*BaseAddress)); tmpLength = (ULONG)*BaseAddress + Length - PAGE_ROUND_DOWN((*BaseAddress));
(*BaseAddress) = (PVOID)PAGE_ROUND_DOWN((*BaseAddress)); (*BaseAddress) = (PVOID)PAGE_ROUND_DOWN((*BaseAddress));
if (AddressSpace->LowestAddress == KERNEL_BASE &&
(*BaseAddress) < (PVOID)KERNEL_BASE)
{
return STATUS_ACCESS_VIOLATION;
}
if (AddressSpace->LowestAddress < KERNEL_BASE &&
(*BaseAddress) + tmpLength > (PVOID)KERNEL_BASE)
{
return STATUS_ACCESS_VIOLATION;
}
if (MmOpenMemoryAreaByRegion(AddressSpace, if (MmOpenMemoryAreaByRegion(AddressSpace,
*BaseAddress, *BaseAddress,
tmpLength)!=NULL) tmpLength)!=NULL)