linux-kernel - Re: [patch 1/1] x86, ptrace: PEBS support

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Date:	Wed, 16 Apr 2008 10:51:57 +0200
From:	"stephane eranian" <eranian@...glemail.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Markus Metzger" <markus.t.metzger@...el.com>,
	andi-suse@...stfloor.org, hpa@...or.com,
	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	markus.t.metzger@...il.com, suresh.b.siddha@...el.com,
	roland@...hat.com, mtk.manpages@...il.com, juan.villacis@...el.com
Subject: Re: [patch 1/1] x86, ptrace: PEBS support

On Wed, Apr 16, 2008 at 9:15 AM, Andi Kleen <andi@...stfloor.org> wrote:
>
>  > Should we skip the RLIMIT_MEMLOCK check if capable(CAP_IPC_LOCK)?
>
>  FWIW I don't think we should. They are not really related.
>
That is true even though I see in mlock() that both are actually used.
I don't check against capabilities in perfmon, but I check RLIMIT_MEMLOCK
for the sampling buffer.

I see the capset()/capget() syscalls, however, I am still not clear as to how a
sysadmin could set up the capabilities for users via PAM or other
security interface.

>
>  > It's a fairly large patch.
>
>  The original version was much smaller -- a lot of the increase came out of
>  review feedback for "more infrastructure" etc. I don't think you can blame
>  Markus for that.
>
I believe the patch could potentially be broken into multiple pieces:
ds/bts, pebs, ptrace.
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