Re: Smashing the Stack?

From: Sebastian Hegenbart (pr1@u-n-f.com)
Date: Sat Jul 20 2002 - 09:31:35 PDT

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     On Wed, 17 Jul 2002 21:11:21 +0100
 strangeat_private wrote:
 
 > On Wed, Jul 17, 2002 at 01:34:38PM -0400, Eric Thomas wrote:
 > > 
 > > I went through this same mystery a few months ago.  Apparently GCC pads
 > > the generated assembly for better memory alignment, which makes certain
 > > operations faster.  
 > 
 > And in some archs, legal. Non-align memory access is illegal in some archs,
 > and non-existant in others (MIPS ignores the last 2/4(?) bits, anyway).
 
 
Note that writing to unaligned memory addresses is a CPU feature of
the x86 family. The CPU will complain if the AC ( alignment check ) flag
is set in the flag register.  
 
lates pr1

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