From: David Daney <ddaney@avtrex.com>
To: Ralf Baechle <ralf@linux-mips.org>
Cc: Kaz Kylheku <kaz@zeugmasystems.com>, linux-mips@linux-mips.org
Subject: Re: futex_wake_op deadlock?
Date: Tue, 20 Nov 2007 10:29:47 -0800 [thread overview]
Message-ID: <4743279B.7070402@avtrex.com> (raw)
In-Reply-To: <20071120112051.GB30675@linux-mips.org>
Ralf Baechle wrote:
>
> Notice the branch at the end of the fixup code, it goes back to the
> SC instruction. The SC instruction took an exception so it will not have
> changed $1 so the loop will continue endless unless by coincidence the
> value to be stored from $1 happened to be zero.
>
> Obviously this one was MIPS specific and may hit all supported ABIs. So
> my initial suspicion this might be the issue David Miller recently
> discovered in the binary compat code isn't true. And it's a local DoS
> probably for all of 2.6.16 and up.
>
I mostly similar code is in 2.6.15, so I think it is effected as well.
2.6.12 on the other hand doesn't seem to have futex.h
David Daney
next prev parent reply other threads:[~2007-11-20 18:30 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-16 23:52 futex_wake_op deadlock? Kaz Kylheku
2007-11-16 23:52 ` Kaz Kylheku
2007-11-19 18:48 ` Ralf Baechle
2007-11-19 21:27 ` Kaz Kylheku
2007-11-19 21:27 ` Kaz Kylheku
2007-11-19 21:42 ` Kaz Kylheku
2007-11-19 21:42 ` Kaz Kylheku
2007-11-20 11:21 ` Ralf Baechle
2007-11-20 18:06 ` Kaz Kylheku
2007-11-20 18:06 ` Kaz Kylheku
2007-11-20 18:16 ` Ralf Baechle
2007-11-20 18:24 ` Kaz Kylheku
2007-11-20 18:24 ` Kaz Kylheku
2007-11-20 18:29 ` David Daney [this message]
2007-11-20 19:00 ` Ralf Baechle
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