linux-kernel - Re: Compat 32-bit syscall entry from 64-bit task!?

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Message-ID: <CAB=4xhqVQXtQnsjfWMGdd+rOsO+PyHd-OkC75cXFHnunzeyuAQ@mail.gmail.com>
Date:	Fri, 20 Jan 2012 15:55:05 -0800
From:	Roland McGrath <mcgrathr@...gle.com>
To:	Indan Zupancic <indan@....nu>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Jamie Lokier <jamie@...reable.org>,
	Andrew Lutomirski <luto@....edu>,
	Oleg Nesterov <oleg@...hat.com>,
	Will Drewry <wad@...omium.org>, linux-kernel@...r.kernel.org,
	keescook@...omium.org, john.johansen@...onical.com,
	serge.hallyn@...onical.com, coreyb@...ux.vnet.ibm.com,
	pmoore@...hat.com, eparis@...hat.com, djm@...drot.org,
	segoon@...nwall.com, rostedt@...dmis.org, jmorris@...ei.org,
	scarybeasts@...il.com, avi@...hat.com, penberg@...helsinki.fi,
	viro@...iv.linux.org.uk, mingo@...e.hu, akpm@...ux-foundation.org,
	khilman@...com, borislav.petkov@....com, amwang@...hat.com,
	ak@...ux.intel.com, eric.dumazet@...il.com, gregkh@...e.de,
	dhowells@...hat.com, daniel.lezcano@...e.fr,
	linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, olofj@...omium.org,
	mhalcrow@...gle.com, dlaor@...hat.com
Subject: Re: Compat 32-bit syscall entry from 64-bit task!?

On Fri, Jan 20, 2012 at 3:49 PM, Indan Zupancic <indan@....nu> wrote:
> It's a lot easier for existing code to add an extra cs check than to use

The issue is whether showing fictitious high bits of %cs as set will break
existing applications (debuggers, etc.) that look at it and think that it's
nothing but the hardware state zero-extended, as it is today.
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