From: Blaisorblade <blaisorblade@yahoo.it>
To: Jeff Dike <jdike@addtoit.com>,
user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] [PATCH] x86_64 32-bit ptrace mangles sixth system call argument
Date: Fri, 2 Feb 2007 18:48:39 +0100 [thread overview]
Message-ID: <200702021848.40114.blaisorblade@yahoo.it> (raw)
In-Reply-To: <20070131224504.GA7698@ccure.user-mode-linux.org>
On Wednesday 31 January 2007 23:45, Jeff Dike wrote:
> [ This is -mm only until Andi acks it ]
>
> The 32-bit sysenter entry point mangles the sixth system call argument
> for both 32-bit and 64-bit ptrace. In both cases, strace shows the
> frame pointer (ebp) as the sixth argument.
>
> Here's a snippet of a 64-bit strace of a 32-bit test program which
> calls mmap through sysenter:
Is this a recent regression or did this always happen?
Is this the bug diagnosed by Bodo Stroesser time ago, or only it looks
similar? I recall vaguely that in that bug RCX was corrupted.
And what is the impact on UML (Bodo said his bug would affect SKAS behaviour)?
Above all, how can UML run in SKAS0 mode with this bug (if it can)?
--
Inform me of my mistakes, so I can add them to my list!
Paolo Giarrusso, aka Blaisorblade
http://www.user-mode-linux.org/~blaisorblade
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next prev parent reply other threads:[~2007-02-02 17:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-31 22:45 [uml-devel] [PATCH] x86_64 32-bit ptrace mangles sixth system call argument Jeff Dike
2007-02-02 17:48 ` Blaisorblade [this message]
2007-02-02 20:12 ` Jeff Dike
2007-03-05 23:03 ` Blaisorblade
2007-03-05 23:10 ` Jeff Dike
2007-03-05 23:26 ` Blaisorblade
2007-03-09 21:50 ` Blaisorblade
2007-03-12 10:42 ` [uml-devel] [PATCH] x86_64 32-bit ptrace mangles sixth systemcall argument Bodo Stroesser
2007-03-12 22:12 ` Blaisorblade
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