From: "H. Peter Anvin" <hpa@zytor.com>
To: Kees Cook <keescook@chromium.org>, linux-kernel@vger.kernel.org
Cc: Rik van Riel <riel@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Matthew Garrett <matthew.garrett@nebula.com>,
Vivek Goyal <vgoyal@redhat.com>, Rob Landley <rob@landley.net>,
Eric Biederman <ebiederm@xmission.com>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Mel Gorman <mgorman@suse.de>,
linux-doc@vger.kernel.org, kexec@lists.infradead.org
Subject: Re: [PATCH v2] kexec: add sysctl to disable kexec
Date: Mon, 09 Dec 2013 16:34:24 -0800 [thread overview]
Message-ID: <52A66190.9060907@zytor.com> (raw)
In-Reply-To: <20131210001620.GA7938@www.outflux.net>
On 12/09/2013 04:16 PM, 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>
> Acked-by: Rik van Riel <riel@redhat.com>
So the logic is to load a crashkernel and then lock down the machine
before services, networking etc. are enabled?
-hpa
next prev parent reply other threads:[~2013-12-10 0:35 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-10 0:16 [PATCH v2] kexec: add sysctl to disable kexec Kees Cook
2013-12-10 0:34 ` H. Peter Anvin [this message]
2013-12-10 1:06 ` Kees Cook
2013-12-10 14:35 ` Vivek Goyal
2013-12-10 14:38 ` Vivek Goyal
2013-12-10 16:32 ` H. Peter Anvin
2013-12-10 18:33 ` Vivek Goyal
2013-12-10 18:54 ` H. Peter Anvin
2013-12-10 19:14 ` Vivek Goyal
2013-12-10 19:33 ` Kees Cook
2013-12-11 17:52 ` Eric W. Biederman
2013-12-11 21:13 ` Kees Cook
2013-12-11 23:15 ` Eric W. Biederman
2013-12-11 23:22 ` Kees Cook
2013-12-12 1:14 ` Eric W. Biederman
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