linux-kernel - Re: [uml-devel] SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weird crap with vdso on uml/i386)

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Message-ID: <CA+55aFzECeh_xRC=sF7qG_nc3bREqUNXXGmzcLHi4vndFvE6cg@mail.gmail.com>
Date:	Tue, 23 Aug 2011 12:43:28 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Andrew Lutomirski <luto@....edu>,
	Borislav Petkov <bp@...64.org>, Ingo Molnar <mingo@...nel.org>,
	"user-mode-linux-devel@...ts.sourceforge.net" 
	<user-mode-linux-devel@...ts.sourceforge.net>,
	Richard Weinberger <richard@....at>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>
Subject: Re: [uml-devel] SYSCALL, ptrace and syscall restart breakages (Re:
 [RFC] weird crap with vdso on uml/i386)

On Tue, Aug 23, 2011 at 12:41 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> And it's not cheap - doing that on each syscall will be unpleasant...
> Frankly, I'd rather stopped telling the uml userland about vdso in such
> setups.  And anything that plays with SYSCALL outside of vdso... <shrug>
> we already have a "don't run it native on 32bit", adding "don't run
> it on 32bit uml on amd64 host" is not too serious.  At least for now...

I do agree that the solution might well be to just stop using the
non-int80 vdsos for UML. That may just solve everything in practice.

                        Linus
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