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implement HackSecureVirtualMemory as a possible workaround for missing MmSecureVirtualMemory

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svn path=/trunk/; revision=34651
This commit is contained in:
Timo Kreuzer 2008-07-21 23:56:26 +00:00
parent 27afd30041
commit ff907c5360
1 changed files with 63 additions and 0 deletions
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63
reactos/subsystems/win32/win32k/eng/mem.c
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@ -105,6 +105,69 @@ EngFreeUserMem(PVOID pv)
ZwFreeVirtualMemory(NtCurrentProcess(), (PVOID *) &Header, &MemSize, MEM_RELEASE);
}
PVOID
NTAPI
HackSecureVirtualMemory(
IN PVOID Address,
IN SIZE_T Size,
IN ULONG ProbeMode,
OUT PVOID *SafeAddress)
{
NTSTATUS Status = STATUS_SUCCESS;
PMDL mdl;
LOCK_OPERATION Operation;
if (ProbeMode == PAGE_READONLY) Operation = IoReadAccess;
else if (ProbeMode == PAGE_READWRITE) Operation = IoModifyAccess;
else return NULL;
mdl = IoAllocateMdl(Address, Size, FALSE, TRUE, NULL);
if (mdl == NULL)
{
return NULL;
}
_SEH_TRY
{
MmProbeAndLockPages(mdl, UserMode, Operation);
}
_SEH_HANDLE
{
Status = _SEH_GetExceptionCode();
}
_SEH_END
if (!NT_SUCCESS(Status))
{
IoFreeMdl(mdl);
return NULL;
}
*SafeAddress = MmGetSystemAddressForMdlSafe(mdl, NormalPagePriority);
if(!*SafeAddress)
{
MmUnlockPages(mdl);
IoFreeMdl(mdl);
return NULL;
}
return mdl;
}
VOID
NTAPI
HackUnsecureVirtualMemory(
IN PVOID SecureHandle)
{
PMDL mdl = (PMDL)SecureHandle;
MmUnlockPages(mdl);
IoFreeMdl(mdl);
}
/*
* @implemented
*/