linux-kernel - Re: [PATCH v5 8/9] x86-64: Emulate legacy vsyscalls

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Date:	Wed, 08 Jun 2011 12:26:49 +0200
From:	pageexec@...email.hu
To:	Andi Kleen <andi@...stfloor.org>
CC:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew 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>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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>,
	Brian Gerst <brgerst@...il.com>,
	Louis Rilling <Louis.Rilling@...labs.com>,
	Valdis.Kletnieks@...edu
Subject: Re: [PATCH v5 8/9] x86-64: Emulate legacy vsyscalls

On 8 Jun 2011 at 12:06, Andi Kleen wrote:

> > eventually may even go away as time progresses and
> > linux systems begin to fully rely on the vdso instead.
> 
> That assumes that everyone uses glibc and also updates their userland. 
> As pointed out many times that's a deeply flawed assumption.

i think the assumption is not that everyone uses glibc but that everyone
else (as in, every other libc) can simply take the necessary changes from
glibc, provided they need such changes at all (i.e., they're using the
vsyscall entry points over the vdso ones).

i frankly didn't check any of the alternatives myself (uclibc/klibc/bionic/etc)
but i can't imagine that it'd be that much harder to patch them than glibc.

as i said, this was a compromise solution but then i think you already made
it clear that you didn't even think there was a problem here to solve, so i
guess we should work that out first, if you want to ;).

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