From: WANG Cong <xiyou.wangcong@gmail.com>
To: kexec@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] kexec: include sysctl to disable
Date: Thu, 20 Jan 2011 05:32:50 +0000 (UTC) [thread overview]
Message-ID: <ih8he2$41t$2@dough.gmane.org> (raw)
In-Reply-To: ih8gpe$41t$1@dough.gmane.org
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@gmail.com>
Thanks.
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WARNING: multiple messages have this Message-ID (diff)
From: WANG Cong <xiyou.wangcong@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: kexec@lists.infradead.org
Subject: Re: [PATCH] kexec: include sysctl to disable
Date: Thu, 20 Jan 2011 05:32:50 +0000 (UTC) [thread overview]
Message-ID: <ih8he2$41t$2@dough.gmane.org> (raw)
In-Reply-To: ih8gpe$41t$1@dough.gmane.org
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@gmail.com>
Thanks.
next prev parent reply other threads:[~2011-01-20 5:35 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-19 22:26 [PATCH] kexec: include sysctl to disable Eric Paris
2011-01-19 22:26 ` Eric Paris
2011-01-20 5:21 ` WANG Cong
2011-01-20 5:21 ` WANG Cong
2011-01-20 5:32 ` WANG Cong [this message]
2011-01-20 5:32 ` WANG Cong
2011-01-27 18:40 ` Eric Paris
2011-01-27 18:40 ` Eric Paris
2011-01-27 18:50 ` Vivek Goyal
2011-01-27 18:50 ` Vivek Goyal
2011-01-27 18:56 ` Neil Horman
2011-01-27 18:56 ` Neil Horman
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