linux-kernel - Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)

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: <1263816857.4283.381.camel@laptop>
Date:	Mon, 18 Jan 2010 13:14:17 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	ananth@...ibm.com, Jim Keniston <jkenisto@...ibm.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	utrace-devel <utrace-devel@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Maneesh Soni <maneesh@...ibm.com>,
	Mark Wielaard <mjw@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)

On Mon, 2010-01-18 at 14:09 +0200, Avi Kivity wrote:
> On 01/18/2010 02:06 PM, Peter Zijlstra wrote:
> > On Mon, 2010-01-18 at 14:01 +0200, Avi Kivity wrote:
> >    
> >> Maybe you place no value on uprobes.  But people who debug userspace
> >> likely will see a reason.
> >>      
> > I do see value in uprobes, I just don't like it mucking about with the
> > address space. Nor does it appear required.
> >    
> 
> Well, the alternatives are very unappealing.  Emulation and 
> single-stepping are going to be very slow compared to a couple of jumps.

With CPL2 or RPL on user segments the protection issue seems to be
manageable for running the instructions from kernel space. 

--
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/