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Re: [Xen-devel] Unable to compile Xen-2.0

from [Ian Pratt]

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To:	Jerome Brown <guruswami@xxxxxxxxxxxx>
Subject:	Re: [Xen-devel] Unable to compile Xen-2.0
From:	Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>
Date:	Wed, 27 Oct 2004 09:12:31 +0100
Cc:	Xen-devel@xxxxxxxxxxxxxxxxxxxxx, Ian.Pratt@xxxxxxxxxxxx
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> > Does stock Linux work when compiled with SSP enabled? Sounds
> > pretty scary to me...
> 
> I haven't specifically tried with the -fstack-protector-all flag enabled 
> for the stock kernel, and the flag wasn't active when compiling Xen. 
> Most of the userland tools on my box are compiled with SSP enabled. What 
> about it sounds scary?

Userland tools are one thing, but kernels tend to be rather more
fragile as regards having compilers monkey with their
stack. Also, when the post-call code detects a stack smash,
what's it going to do? I suppose it can execute an illegal
instruction and thus cause a GPF and thus halt.

Ian


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