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b507bd0612
- Fix code headers. No code changes. - Rename csrcl.h to csr.h for readability purposes. - exitros.c --> shutdown.c svn path=/branches/ros-csrss/; revision=57618
42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS Console Server DLL
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* FILE: win32ss/user/consrv/init.c
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* PURPOSE: Server APIs
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* PROGRAMMERS: Hermes Belusca-Maito (hermes.belusca@sfr.fr)
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*/
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#include "consrv.h"
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#define NDEBUG
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#include <debug.h>
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/* Ensure that a captured buffer is safe to access */
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BOOL FASTCALL
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Win32CsrValidateBuffer(PCSR_PROCESS ProcessData, PVOID Buffer,
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SIZE_T NumElements, SIZE_T ElementSize)
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{
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/* Check that the following conditions are true:
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* 1. The start of the buffer is somewhere within the process's
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* shared memory section view.
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* 2. The remaining space in the view is at least as large as the buffer.
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* (NB: Please don't try to "optimize" this by using multiplication
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* instead of division; remember that 2147483648 * 2 = 0.)
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* 3. The buffer is DWORD-aligned.
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*/
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ULONG_PTR Offset = (BYTE *)Buffer - (BYTE *)ProcessData->ClientViewBase;
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if (Offset >= ProcessData->ClientViewBounds
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|| NumElements > (ProcessData->ClientViewBounds - Offset) / ElementSize
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|| (Offset & (sizeof(DWORD) - 1)) != 0)
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{
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DPRINT1("Invalid buffer %p(%u*%u); section view is %p(%u)\n",
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Buffer, NumElements, ElementSize,
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ProcessData->ClientViewBase, ProcessData->ClientViewBounds);
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return FALSE;
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}
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return TRUE;
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}
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/* EOF */
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