linux-kernel - Re: new module to check constant memory for corruption

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Message-ID: <alpine.LRH.2.00.1404141613080.3839@twin.jikos.cz>
Date:	Mon, 14 Apr 2014 16:14:29 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Richard Weinberger <richard@....at>, Alexander.Kleinsorge@....de
cc:	andi@...stfloor.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: new module to check constant memory for corruption

On Sun, 13 Apr 2014, Richard Weinberger wrote:

> > Hi Richard,
> > 
> > I updated my code and check for ftrace (cat /proc/sys/kernel/ftrace_enabled > 0).
> > http://tauruz.homeip.net/ramcheck.tgz
> > 
> > On a 24/7 server ftrace is not a common thing anyway.
> 
> I disagree with you.
> perf, systemtap and other tools are widely used on "24/7" servers.

Plus the self-modifying code is present in other parts of kernel that have 
nothing to do with tracing as well. Consider static keys for example; they 
are used heavily in networking stack, scheduler code, etc.

-- 
Jiri Kosina
SUSE Labs

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