Leaked source code of windows server 2003
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;\ ; ole.asm ; ; Copyright (C) 1991, MicroSoft Corporation ; ; Contains pointer vaildation routine ; ; History: sriniK 02/26/1991 original ;/
.286p.MODEL SMALL.CODE
;**************************** _CheckPointer ****************************;; WORD CheckPointer (lp, access);; Args:; lp pointer to be verified; access 0 test the pointer for read access; 1 test the pointer for write access; returns: ; FALSE invalid pointer; TRUE valid pointer;;; public _CheckPointer
_CheckPointer proc
push bp mov bp, sp xor ax, ax and word ptr [bp+8], -1 jnz check_write_access
verr word ptr [bp+6] ; check selector for read access jnz error jmp short check_offset
check_write_access: verw word ptr [bp+6] ; check selector for write access jnz error check_offset: lsl bx, word ptr [bp+6] ; segment limit gets copied into BX jnz error cmp [bp+4], bx ja error or ax, -1 error: pop bp ret
_CheckPointer endp end
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