linux-kernel - Re: [PATCH] x86-64, vsyscalls: Rename UNSAFE_VSYSCALLS to COMPAT

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Date:	Thu, 9 Jun 2011 08:48:47 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	pageexec@...email.hu
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@....edu>, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Jesper Juhl <jj@...osbits.net>,
	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Jan Beulich <JBeulich@...ell.com>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	Mikael Pettersson <mikpe@...uu.se>,
	Andi Kleen <andi@...stfloor.org>,
	Brian Gerst <brgerst@...il.com>,
	Louis Rilling <Louis.Rilling@...labs.com>,
	Valdis.Kletnieks@...edu, Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] x86-64, vsyscalls: Rename UNSAFE_VSYSCALLS to
 COMPAT_VSYSCALLS


* pageexec@...email.hu <pageexec@...email.hu> wrote:

> On 7 Jun 2011 at 11:56, Ingo Molnar wrote:
> 
> > Fedora was able to disable the fixed-address vdso in its newer 32-bit 
> > distro kernels because it *upgraded glibc*.
> 
> and what happened to those apps that users statically linked against
> the older glibc? what happened to their chroots that had dynamically
> linked binaries with an older glibc? did you not break those either?

There's two reasons why a distributor will generally not worry about 
that case:

 - No such binaries come with a default distro install

 - Keeping such old libraries linked or chrooted can be a security
   hole in itself, so i dou guarantee something like this.

If another distribution considers this a serious enough issue it can 
keep the COMPAT_VDSO option enabled forever. Few (none?) did.

Thanks,

	Ingo
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