linux-kernel - Re: linux-next: add utrace tree

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20100129093136.GH16920@in.ibm.com>
Date:	Fri, 29 Jan 2010 15:01:36 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jim Keniston <jkenisto@...ibm.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Kyle Moffett <kyle@...fetthome.net>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Tom Tromey <tromey@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>, linux-next@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>, utrace-devel@...hat.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: linux-next: add utrace tree

On Fri, Jan 29, 2010 at 10:11:16AM +0100, Ingo Molnar wrote:
> 
> * Ananth N Mavinakayanahalli <ananth@...ibm.com> wrote:
> 
> > On Fri, Jan 29, 2010 at 08:39:07AM +0100, Ingo Molnar wrote:
> > 
> > ...
> > 
> > > When we merged kprobes ~10 years ago we made the (rather bad) mistake of 
> > > merging a raw, opaque facility and leaving 'the rest' up to some other entity. 
> > > IBM kprobes hackers vanished the day the original kprobes code went upstream 
> > > and the high level entity never truly materialized in-kernel, for nearly a 
> > > decade!
> > 
> > I don't know what you are referring to here... Kprobes was merged in 2.6.9 
> > (~August 2004 -- less than 6 years ago). [...]
> 
> Ok, 6 years then :-)
>
> > [...] Since then, we did work on ports to powerpc and s390. We implemented 
> > kretprobes. We made it much scalable using RCU; we did the powerpc booster 
> > to skip single-step when possible, not to mention various bug fixes over the 
> > years.
> 
> Except it had no real in-kernel user.

Not that I want to rebut you Ingo, but there were in-kernel users since 2006
(net/ipv4/tcp_probe.c) :-)

Aside, I am also glad that we have more flexibility with the perf
integration.

Ananth
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/