linux-kernel - Re: Current utrace breaks UML

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Message-ID: <20070526021013.GA11490@c2.user-mode-linux.org>
Date:	Fri, 25 May 2007 22:10:13 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Current utrace breaks UML

On Fri, May 25, 2007 at 06:35:13PM -0700, Roland McGrath wrote:
> Oops!  I overlooked the need to preserve the orig_eax value, though its
> necessity is obvious.  This makes me wonder about those previous
> reports that UML was working OK.

The one from me was on x86_64, where PTRACE_SYSEMU isn't an issue yet.

> I've fixed this in the latest utrace patch set.  I also wired up
> sysemu on x86_64.  This means 32-bit processes calling ptrace now
> support it for full compatibility with native i386, which the vanilla
> kernel does not.  It also means it works for 64-bit ptrace calls,
> whether operating on a 64-bit or a 32-bit target process.

Beautiful!

				Jeff

-- 
Work email - jdike at linux dot intel dot com
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