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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4743279B.7070402@avtrex.com \
--to=ddaney@avtrex.com \
--cc=kaz@zeugmasystems.com \
--cc=linux-mips@linux-mips.org \
--cc=ralf@linux-mips.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.