From: Pavel Machek <pavel@ucw.cz>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Vasiliy Kulikov <segoon@openwall.com>,
linux-kernel@vger.kernel.org, security@kernel.org,
Len Brown <len.brown@intel.com>,
linux-pm@lists.linux-foundation.org
Subject: Re: [PATCH] power: disable hibernation if module loading is disabled
Date: Tue, 8 Mar 2011 07:58:45 +0100 [thread overview]
Message-ID: <20110308065845.GB1357@ucw.cz> (raw)
In-Reply-To: <201103051224.18621.rjw@sisk.pl>
Hi!
> > > modules_disabled surely is not the right interface to disable hibernation
> > > and I don't really think there's a bug because it doesn't work as you'd like
> > > it to. In fact, there would be a bug if it did work that way.
> >
> > What do you mean here? Do you agree that you may read kernel image,
> > slightly change it (including e.g. possible checksums, I didn't bother
> > to check how much one should change), and write it back?
>
> Yes, you can, but that's not the point. The point is that calling an interface
> that disables all possible functionality modifying kernel memory
> "modules_disabled" is completely dumb. Sorry, but that's how it goes.
Fully agreed.
If you want a subset of cap_sys_admin than can't install
rootkit... just do it like that. Create cap_small_admin with such
subset and migrate people that don't need full admin to it.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2011-03-08 6:59 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-04 16:11 Vasiliy Kulikov
2011-03-04 18:43 ` Kees Cook
2011-03-04 20:48 ` Rafael J. Wysocki
2011-03-04 20:32 ` Pavel Machek
2011-03-04 21:52 ` Vasiliy Kulikov
2011-03-04 20:42 ` Rafael J. Wysocki
2011-03-04 21:10 ` Vasiliy Kulikov
2011-03-04 21:21 ` Rafael J. Wysocki
2011-03-04 21:46 ` Vasiliy Kulikov
2011-03-04 22:30 ` Rafael J. Wysocki
2011-03-04 22:42 ` Pavel Machek
2011-03-05 10:34 ` Vasiliy Kulikov
2011-03-05 11:24 ` Rafael J. Wysocki
2011-03-08 6:58 ` Pavel Machek [this message]
2011-03-04 21:27 ` [Security] " Greg KH
2011-03-04 21:51 ` Vasiliy Kulikov
2011-03-06 19:36 ` david
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