linux-kernel - Re: [PATCH] kexec: include sysctl to disable

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Message-ID: <ih8he2$41t$2@dough.gmane.org>
Date:	Thu, 20 Jan 2011 05:32:50 +0000 (UTC)
From:	WANG Cong <xiyou.wangcong@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	kexec@...ts.infradead.org
Subject: Re: [PATCH] kexec: include sysctl to disable

On Thu, 20 Jan 2011 05:21:50 +0000, WANG Cong wrote:

> On Wed, 19 Jan 2011 17:26:30 -0500, Eric Paris wrote:
> 
>> much like /proc/sys/kernel/modules_disable is used to disable module
>> loading, /proc/sys/kernel/kexec_disable is used to disable kexec code
>> loading.  It would still be possible to use kexec -l to load a kernel,
>> set the tunable to 1 so the kernel waiting to boot couldn't change, and
>> then launch the kernel at a later time (through kexec -e or through a
>> crash)
>> 
>> 
> But root can still change it to 0 and do kexec like normal, right?

Er... never mind, it is a one-way road...

Looks like a good balance between reusing CAP_SYS_MODULE and introducing
a new CAP_SYS_XXX.

Acked-by: WANG Cong <xiyou.wangcong@...il.com>

Thanks.

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