linux-kernel - Re: [PATCH] x86_64: fix perms/range of vsyscall vma in /proc/*/maps

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Message-Id: <200611140352.54669.ak@suse.de>
Date:	Tue, 14 Nov 2006 03:52:54 +0100
From:	Andi Kleen <ak@...e.de>
To:	Ernie Petrides <petrides@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86_64: fix perms/range of vsyscall vma in /proc/*/maps

On Tuesday 14 November 2006 03:51, Ernie Petrides wrote:
> On Friday, 10-Nov-2006 at 6:07 +0100, Andi Kleen wrote:
> 
> > On Friday 10 November 2006 02:20, Ernie Petrides wrote:
> >
> > > Hi, Andi.  The final line of /proc/<pid>/maps on x86_64 for native 64-bit
> > > tasks shows an incorrect ending address and incorrect permissions.  There
> > > is only a single page mapped in this vsyscall region, and it is accessible
> > > for both read and execute.
> > 
> > The range reported is how much address space is reserved, but you're
> > right it is less.
> > 
> > But I don't like hardcoding a page here -- this will likely be extended
> > soon. Can you please create a new define VSYSCALL_REAL_LENGTH or similar 
> > in vsyscall.h and use that?
> 
> Good idea -- how about the patch below?

Added thanks. Probably for .20, i don't think it's critical enough for .19
unless someone feels strongly about it.

-Andi

P.S.: When you retransmit patches please always include the original description
for the changelog too.
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