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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: viro@math.psu.edu, torvalds@transmeta.com (Linus Torvalds),
        paulus@linuxcare.com.au (Paul Mackerras), linux-kernel@vger.kernel.org
Subject: Re: page->mapping == 0 
In-Reply-To: Your message of "Sun, 29 Oct 2000 20:32:00 GMT."
             <E13pz7a-0006JY-00@the-village.bc.nu> 
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Date: Sun, 29 Oct 2000 18:12:00 -0500
From: Jeff Dike <jdike@karaya.com>
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alan@lxorguk.ukuu.org.uk said:
> Well the ptrace one still has mysteriously breaks usermode linux
> against it on my list here. Was that ever explained. It looked like
> the stack got corrupted which is weird.

If this is the test8 "turn off ORIG_EAX if EIP is changed" fix, it apparently 
also broke a couple of other ptrace-intensive things which aren't coming to 
mind (Andi Kleen noticed them).

AFAIK, it was never explained.  Something would change its victim's EIP and 
the victim would segfault as soon as it was continued.

				Jeff


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