bugtraq - Re: Buffer overflow prevention

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Date: Thu, 14 Aug 2003 11:44:13 +0200 (EEST)
From: Mariusz Woloszyn <emsi@...rtners.pl>
To: bugtraq <bugtraq@...urityfocus.com>
Subject: Re: Buffer overflow prevention


On Wed, 13 Aug 2003, Patrick Dolan wrote:

> There is a flag for the Gnu C/C++ compilers, -fstack-protector, that will
> implement ProPolice stack protection.  It should prevent stack smashing
> techniques.
>
ProPolice (http://www.research.ibm.com/trl/projects/security/ssp/) is a
great tool that not only protects the return address on the stack, but
also changes the order of local variables and protects the function
arguments! It's a way better protector than StackGuard and is a way more
efficient than a "two stack approach", providing _almost_ as good
protection, which sometimes is even better!!![1]


[1]: it protects the local variables (pointer) and function arguments,
which neither StagGuard nor StackShield ("two stack approach") do.

--
Mariusz Wo³oszyn
Internet Security Specialist, GTS - Internet Partners