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From: Jiri Kosina <jkosina@suse.cz>
To: Jiri Slaby <jslaby@suse.cz>
Cc: Aravinda Prasad <aravinda@linux.vnet.ibm.com>,
	linux-kernel@vger.kernel.org, jirislaby@gmail.com,
	Vojtech Pavlik <vojtech@suse.cz>, Michael Matz <matz@suse.de>,
	Steven Rostedt <rostedt@goodmis.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Ingo Molnar <mingo@redhat.com>
Subject: Re: [RFC 03/16] kgr: initial code
Date: Mon, 26 May 2014 10:50:44 +0200 (CEST)	[thread overview]
Message-ID: <alpine.LNX.2.00.1405261049390.12047@pobox.suse.cz> (raw)
In-Reply-To: <537B3E43.5070306@suse.cz>

On Tue, 20 May 2014, Jiri Slaby wrote:

> Yes, this is a problem I was thinking of in another context yesterday.
> Patching ->read or any other file_openrations which hold state over
> user<->kernel switches may be a potential threat like above. The same as
> in other implementations of live patching IMO. I put that on a TODO
> checklist for creating patches. This has to be investigated manually
> when creating a patch.

Another thing that has to be handled very carefully is patching functions 
which are using self-modifying code (static keys), to make sure that the 
logic is not switched in the new function.

-- 
Jiri Kosina
SUSE Labs

  parent reply	other threads:[~2014-05-26  8:50 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-30 14:30 [RFC 00/16] kGraft Jiri Slaby
2014-04-30 14:30 ` [RFC 01/16] ftrace: Add function to find fentry of function Jiri Slaby
2014-04-30 14:48   ` Steven Rostedt
2014-04-30 14:58     ` Jiri Slaby
2014-04-30 14:30 ` [RFC 02/16] ftrace: Make ftrace_is_dead available globally Jiri Slaby
2014-04-30 14:30 ` [RFC 03/16] kgr: initial code Jiri Slaby
2014-04-30 14:56   ` Steven Rostedt
2014-04-30 14:57     ` Jiri Slaby
2014-05-01 20:20   ` Andi Kleen
2014-05-01 20:37     ` Jiri Kosina
2014-05-14  9:28   ` Aravinda Prasad
2014-05-14 10:12     ` Jiri Slaby
2014-05-14 10:41       ` Aravinda Prasad
2014-05-14 10:44         ` Jiri Slaby
2014-05-14 11:19           ` Aravinda Prasad
2014-05-20 11:36     ` Jiri Slaby
2014-05-21 18:28       ` Aravinda Prasad
2014-05-26  8:50       ` Jiri Kosina [this message]
2014-04-30 14:30 ` [RFC 04/16] kgr: add testing kgraft patch Jiri Slaby
2014-05-06 11:03   ` Pavel Machek
2014-05-12 12:50     ` Jiri Slaby
2014-04-30 14:30 ` [RFC 05/16] kgr: update Kconfig documentation Jiri Slaby
2014-05-03 14:32   ` Randy Dunlap
2014-04-30 14:30 ` [RFC 06/16] kgr: add Documentation Jiri Slaby
2014-05-06 11:03   ` Pavel Machek
2014-05-09  9:31     ` kgr: dealing with optimalizations? (was Re: [RFC 06/16] kgr: add Documentat)ion Pavel Machek
2014-05-09 12:22       ` Michael Matz
2014-04-30 14:30 ` [RFC 07/16] kgr: trigger the first check earlier Jiri Slaby
2014-04-30 14:30 ` [RFC 08/16] kgr: sched.h, introduce kgr_task_safe helper Jiri Slaby
2014-04-30 14:30 ` [RFC 09/16] kgr: mark task_safe in some kthreads Jiri Slaby
2014-04-30 15:49   ` Greg Kroah-Hartman
2014-04-30 16:55   ` Paul E. McKenney
2014-04-30 18:33     ` Vojtech Pavlik
2014-04-30 19:07       ` Paul E. McKenney
2014-05-01 14:24   ` Tejun Heo
2014-05-01 20:17     ` Jiri Kosina
2014-05-01 21:02       ` Tejun Heo
2014-05-01 21:09         ` Tejun Heo
2014-05-14 14:59           ` Jiri Slaby
2014-05-14 15:15             ` Vojtech Pavlik
2014-05-14 15:30               ` Paul E. McKenney
2014-05-14 16:32               ` Tejun Heo
2014-05-15  3:53                 ` Mike Galbraith
2014-05-15  4:06                   ` Tejun Heo
2014-05-15  4:46                     ` Mike Galbraith
2014-05-15  4:50                       ` Tejun Heo
2014-05-15  5:04                         ` Mike Galbraith
2014-05-15  5:09                           ` Tejun Heo
2014-05-15  5:32                             ` Mike Galbraith
2014-05-15  6:05                               ` Tejun Heo
2014-05-15  6:32                                 ` Mike Galbraith
2014-04-30 14:30 ` [RFC 10/16] kgr: kthreads support Jiri Slaby
2014-04-30 14:30 ` [RFC 11/16] kgr: handle irqs Jiri Slaby
2014-04-30 14:30 ` [RFC 12/16] kgr: add tools Jiri Slaby
2014-05-06 11:03   ` Pavel Machek
2014-04-30 14:30 ` [RFC 13/16] kgr: add MAINTAINERS entry Jiri Slaby
2014-04-30 14:30 ` [RFC 14/16] kgr: x86: refuse to build without fentry support Jiri Slaby
2014-04-30 14:30 ` [RFC 15/16] kgr: add procfs interface for per-process 'kgr_in_progress' Jiri Slaby
2014-04-30 14:30 ` [RFC 16/16] kgr: make a per-process 'in progress' flag a single bit Jiri Slaby

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