full-disclosure - Re: Advantages of Stack Guard over Stack Shield

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Message-ID: <alpine.LRH.2.02.1310221125370.14163@argo.troja.mff.cuni.cz>
Date: Tue, 22 Oct 2013 11:53:45 +0200 (CEST)
From: Pavel Kankovsky <peak@...o.troja.mff.cuni.cz>
To: Jaydeep Solanki <jaydp17@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Advantages of Stack Guard over Stack Shield

On Sun, 20 Oct 2013, Jaydeep Solanki wrote:

> I would like to know why nowadays Stack Guard is used everywhere 
> (example: ProPolice in GCC, /GS in Visual Studio) instead of Stack 
> Shield.

Stack Shield needs to manage two stacks (an ordinary stack and an extra 
stack for saved returned addresses). This is prone to break various things 
(multithreading, longjmp) and I am afraid a hypothetical implementation 
would have to be quite heavyweight and messy in order to avoid breaking 
them.

-- 
Pavel Kankovsky aka Peak                          / Jeremiah 9:21        \
"For death is come up into our MS Windows(tm)..." \ 21st century edition /

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