linux-kernel - Re: [PATCH] perf: ARM: Record the user-mode PC in the call chain.

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: <20130620031706.GB27428@mozilla.com>
Date:	Wed, 19 Jun 2013 20:17:06 -0700
From:	Jed Davis <jld@...illa.com>
To:	Will Deacon <will.deacon@....com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf: ARM: Record the user-mode PC in the call chain.

On Tue, Jun 18, 2013 at 02:13:19PM +0100, Will Deacon wrote:
> On Fri, Jun 14, 2013 at 12:21:11AM +0100, Jed Davis wrote:
> > With this change, we no longer lose the innermost entry in the user-mode
> > part of the call chain.  See also the x86 port, which includes the ip.
> > 
> > It's possible to partially work around this problem by post-processing
> > the data to use the PERF_SAMPLE_IP value, but this works only if the CPU
> > wasn't in the kernel when the sample was taken.
> 
> Thanks. I guess we need something similar for arm64 too. Could you cook a
> similar patch please?

Done (and tested, on the ARM V8 Foundation Model).

It looked as if the powerpc and sparc ports might have similar issues,
but I haven't checked on them yet.

--Jed

--
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/