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From: Khalid Aziz <khalid@gonehiking.org>
To: Kees Cook <keescook@chromium.org>
Cc: Matthew Garrett <matthew.garrett@nebula.com>,
	Rik van Riel <riel@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	Eric Biederman <ebiederm@xmission.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Ingo Molnar <mingo@kernel.org>, Vivek Goyal <vgoyal@redhat.com>,
	Mel Gorman <mgorman@suse.de>
Subject: Re: [PATCH] kexec: add sysctl to disable kexec
Date: Mon, 09 Dec 2013 17:19:48 -0700	[thread overview]
Message-ID: <1386634788.24817.46.camel@rhapsody> (raw)
In-Reply-To: <20131209233829.GA3501@www.outflux.net>

On Mon, 2013-12-09 at 15:38 -0800, Kees Cook wrote:
> For general-purpose (i.e. distro) kernel builds it makes sense to build with
> CONFIG_KEXEC to allow end users to choose what kind of things they want to do
> with kexec. However, in the face of trying to lock down a system with such
> a kernel, there needs to be a way to disable kexec (much like module loading
> can be disabled). Without this, it is too easy for the root user to modify
> kernel memory even when CONFIG_STRICT_DEVMEM and modules_disabled are set.
> 
> Signed-off-by: Kees Cook <keescook@chromium.org>

Giving Sys admins more control to secure their system is a good idea.
This addition looks good to me.

--
Khalid


_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

WARNING: multiple messages have this Message-ID (diff)
From: Khalid Aziz <khalid@gonehiking.org>
To: Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org,
	Matthew Garrett <matthew.garrett@nebula.com>,
	Rik van Riel <riel@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	kexec@lists.infradead.org, Eric Biederman <ebiederm@xmission.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Ingo Molnar <mingo@kernel.org>, Vivek Goyal <vgoyal@redhat.com>,
	Mel Gorman <mgorman@suse.de>
Subject: Re: [PATCH] kexec: add sysctl to disable kexec
Date: Mon, 09 Dec 2013 17:19:48 -0700	[thread overview]
Message-ID: <1386634788.24817.46.camel@rhapsody> (raw)
In-Reply-To: <20131209233829.GA3501@www.outflux.net>

On Mon, 2013-12-09 at 15:38 -0800, Kees Cook wrote:
> For general-purpose (i.e. distro) kernel builds it makes sense to build with
> CONFIG_KEXEC to allow end users to choose what kind of things they want to do
> with kexec. However, in the face of trying to lock down a system with such
> a kernel, there needs to be a way to disable kexec (much like module loading
> can be disabled). Without this, it is too easy for the root user to modify
> kernel memory even when CONFIG_STRICT_DEVMEM and modules_disabled are set.
> 
> Signed-off-by: Kees Cook <keescook@chromium.org>

Giving Sys admins more control to secure their system is a good idea.
This addition looks good to me.

--
Khalid


  parent reply	other threads:[~2013-12-10  0:20 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-12-09 23:38 [PATCH] kexec: add sysctl to disable kexec Kees Cook
2013-12-09 23:38 ` Kees Cook
2013-12-09 23:53 ` Rik van Riel
2013-12-09 23:53   ` Rik van Riel
2013-12-10  0:15   ` Kees Cook
2013-12-10  0:15     ` Kees Cook
2013-12-10  0:19 ` Khalid Aziz [this message]
2013-12-10  0:19   ` Khalid Aziz

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