linux-kernel - RE: [tip:tracing/core] Revert "x86, bts: reenable ptrace branch trace support"

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-next>] [day] [month] [year] [list]

Message-ID: <928CFBE8E7CB0040959E56B4EA41A77EBBC6544B@irsmsx504.ger.corp.intel.com>
Date:	Thu, 11 Jun 2009 07:30:36 +0100
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"Metzger, Markus T" <markus.t.metzger@...el.com>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: RE: [tip:tracing/core] Revert "x86, bts: reenable ptrace branch
 trace support"

>-----Original Message-----
>From: tip-bot for Ingo Molnar [mailto:mingo@...e.hu]
>Sent: Thursday, June 11, 2009 1:37 AM
>To: linux-tip-commits@...r.kernel.org
>Cc: hpa@...or.com; mingo@...hat.com; peterz@...radead.org; Metzger, Markus T; oleg@...hat.com;
>tglx@...utronix.de; mingo@...e.hu
>Subject: [tip:tracing/core] Revert "x86, bts: reenable ptrace branch trace support"
>
>Commit-ID:  511b01bdf64ad8a38414096eab283c7784aebfc4
>Gitweb:     http://git.kernel.org/tip/511b01bdf64ad8a38414096eab283c7784aebfc4
>Author:     Ingo Molnar <mingo@...e.hu>
>AuthorDate: Thu, 11 Jun 2009 00:32:00 +0200
>Committer:  Ingo Molnar <mingo@...e.hu>
>CommitDate: Thu, 11 Jun 2009 00:32:00 +0200
>
>Revert "x86, bts: reenable ptrace branch trace support"
>
>This reverts commit 7e0bfad24d85de7cf2202a7b0ce51de11a077b21.
>
>A late objection to the ABI has arrived:
>
>   http://lkml.org/lkml/2009/6/10/253

I thought that this has been resolved. See for example http://lkml.org/lkml/2009/6/10/257.

Peters concerns were that Debug Store details are exposed to user space, which is
not the case. Debug Store itself is fully in-kernel and the expectation of a 
user-defined buffer can be implemented on top of the Debug Store changes that
Peter expects are needed to support PEBS.

A user-defined trace buffer size is required to support different usage models.
Some users only need a small amount of trace, whereas others need a big amount.
The interface will have to reflect that in some way.

regards,
markus.

---------------------------------------------------------------------
Intel GmbH
Dornacher Strasse 1
85622 Feldkirchen/Muenchen Germany
Sitz der Gesellschaft: Feldkirchen bei Muenchen
Geschaeftsfuehrer: Douglas Lusk, Peter Gleissner, Hannes Schwaderer
Registergericht: Muenchen HRB 47456 Ust.-IdNr.
VAT Registration No.: DE129385895
Citibank Frankfurt (BLZ 502 109 00) 600119052

This e-mail and any attachments may contain confidential material for
the sole use of the intended recipient(s). Any review or distribution
by others is strictly prohibited. If you are not the intended
recipient, please contact the sender and delete all copies.