linux-kernel - Re: Current utrace breaks UML

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Date:	Fri, 25 May 2007 18:35:13 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Jeff Dike <jdike@...toit.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Current utrace breaks UML

> UML, obviously.  Below is a smaller test.  orig_eax is wrong, so you
> can't read the system call number from the process.

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.

I refined the test case a little and that's in
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=241408

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.

Thanks,
Roland
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