Subject: Buffer overflow prevention From: "Eygene A. Ryabinkin" <rea () rea ! mbslab ! kiae ! ru> Date: 2003-08-13 10:28:33 > So, my suggestion: let us organise two segments: one for normal > stack, growing downwards, referenced by SS:ESP pair and the second > one, for local variables, referenced by GS:EBP pair, with either > upwards or downwards growing. [...] > Second, rewrite the compiler to support the new scheme of local > variables addresation. So, the changes are minimal, in some sence. As soon as you create two segments with different base addresses you will have to increase the size of the internal pointer representation (to store or at least identify the segment in which the given pointer as a logical address is valid), otherwise functions taking pointers would not be able to tell in which segment to dereference a given pointer value. This change will open a whole can of worms, it's definitely not a minimal change as you suggest and if you go to this trouble, you might as well go for full bounds checking.
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