VOID NTAPI ProbeForWrite	(	IN PVOID	Address,
		IN SIZE_T	Length,
		IN ULONG	Alignment
	)

Definition at line 143 of file exintrin.c.

Referenced by AcpiOsWritable(), co_UserCallNextHookEx(), DefaultQueryInfoBufferCheck(), DoQuery(), EngSecureMem(), IopDeviceFsIoControl(), IopGetDeviceProperty(), IopGetRelatedDevice(), IopQueryAttributesFile(), KeUserModeCallback(), KiDispatchException(), KiDispatchExceptionToUser(), KiInitializeUserApc(), KspPropertyHandler(), KsProbeStreamIrp(), KsReadFile(), MiDoMappedCopy(), MiDoPoolCopy(), NtAccessCheck(), NtAdjustPrivilegesToken(), NtAllocateLocallyUniqueId(), NtCreateKeyedEvent(), NtCreateProfile(), NtCreateThread(), NtEnumerateKey(), NtEnumerateValueKey(), NtGdiCombineTransform(), NtGdiDescribePixelFormat(), NtGdiDoPalette(), NtGdiExtEscape(), NtGdiExtGetObjectW(), NtGdiGetAndSetDCDword(), NtGdiGetAppClipBox(), NtGdiGetBitmapBits(), NtGdiGetBitmapDimension(), NtGdiGetBoundsRect(), NtGdiGetDCDword(), NtGdiGetDCPoint(), NtGdiGetDeviceCapsAll(), NtGdiGetDeviceGammaRamp(), NtGdiGetDIBitsInternal(), NtGdiGetFontResourceInfoInternalW(), NtGdiGetFontUnicodeRanges(), NtGdiGetGlyphIndicesW(), NtGdiGetGlyphOutline(), NtGdiGetKerningPairs(), NtGdiGetMiterLimit(), NtGdiGetOutlineTextMetricsInternalW(), NtGdiGetRasterizerCaps(), NtGdiGetRealizationInfo(), NtGdiGetRgnBox(), NtGdiGetTextCharsetInfo(), NtGdiGetTextMetricsW(), NtGdiGetTransform(), NtGdiMoveTo(), NtGdiOffsetViewportOrgEx(), NtGdiOffsetWindowOrgEx(), NtGdiOpenDCW(), NtGdiScaleViewportExtEx(), NtGdiScaleWindowExtEx(), NtGdiSetBitmapDimension(), NtGdiSetBrushOrg(), NtGdiSetMiterLimit(), NtGdiSetViewportOrgEx(), NtGdiSetWindowOrgEx(), NtGdiTransformPoints(), NtGetWriteWatch(), NtNotifyChangeDirectoryFile(), NtOpenKeyedEvent(), NtPlugPlayControl(), NtPrivilegeCheck(), NtQueryDirectoryFile(), NtQueryDirectoryObject(), NtQueryInformationAtom(), NtQueryInformationFile(), NtQueryInformationProcess(), NtQueryInformationThread(), NtQueryKey(), NtQueryObject(), NtQuerySecurityObject(), NtQuerySymbolicLinkObject(), NtQuerySystemEnvironmentValue(), NtQuerySystemInformation(), NtQueryValueKey(), NtQueryVirtualMemory(), NtQueryVolumeInformationFile(), NtReadFile(), NtUserBuildHwndList(), NtUserCallMsgFilter(), NtUserCallOneParam(), NtUserCopyAcceleratorTable(), NtUserCreateLocalMemHandle(), NtUserEnumDisplayDevices(), NtUserEnumDisplaySettings(), NtUserGetClassInfo(), NtUserGetClipboardData(), NtUserGetClipboardFormatName(), NtUserGetComboBoxInfo(), NtUserGetCursorInfo(), NtUserGetIconInfo(), NtUserGetIconSize(), NtUserGetInternalWindowPos(), NtUserGetKeyboardLayoutList(), NtUserGetKeyboardLayoutName(), NtUserGetKeyboardState(), NtUserGetKeyNameText(), NtUserGetMessage(), NtUserGetMouseMovePointsEx(), NtUserGetTitleBarInfo(), NtUserMessageCall(), NtUserPeekMessage(), NtUserScrollDC(), NtUserScrollWindowEx(), NtUserTrackMouseEvent(), NtWaitForDebugEvent(), PsGetContextThread(), and SpiMemCopy().

{
    ULONG_PTR Last, Current = (ULONG_PTR)Address;
    PAGED_CODE();

    /* Only probe if we have a valid length */
    if (Length != 0)
    {
        /* Sanity check */
        ASSERT((Alignment == 1) ||
               (Alignment == 2) ||
               (Alignment == 4) ||
               (Alignment == 8) ||
               (Alignment == 16));

        /* Check the alignment */
        if ((Current & (Alignment - 1)) != 0)
        {
            /* Incorrect alignment */
            ExRaiseDatatypeMisalignment();
        }

        /* Get the end address */
        Last = Current + Length - 1;
        if ((Last < Current) || (Last >= (ULONG_PTR)MmUserProbeAddress))
        {
            /* Raise an access violation */
            ExRaiseAccessViolation();
        }

        /* Round down to the last page */
        Last = PAGE_ROUND_DOWN(Last) + PAGE_SIZE;
        do
        {
            /* Attempt a write */
            *(volatile CHAR*)Current = *(volatile CHAR*)Current;

            /* Go to the next address */
            Current = PAGE_ROUND_DOWN(Current) + PAGE_SIZE;
        } while (Current != Last);
    }
}

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