linux-kernel - Re: [PATCH 2/2] x86: Allow disabling of sys_iopl, sys

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Message-ID: <CAGTjWtBUavDUMFoFAFGrUQ700U7YDUBQL_w5rezOsLhp3fjGzw@mail.gmail.com>
Date:	Fri, 15 Jul 2011 15:42:01 -0700
From:	Mike Waychison <mikew@...gle.com>
To:	"Andrew G. Morgan" <agm@...gle.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Klibc mailing list <klibc@...or.com>
Subject: Re: [PATCH 2/2] x86: Allow disabling of sys_iopl, sys_ioperm

On Fri, Jul 15, 2011 at 3:30 PM, Andrew G. Morgan <agm@...gle.com> wrote:
> I'd put it in kinit too.
>
> I think you may have to think about the call_usermodehelper code, and
> you might want to look at dropping CAP_SYS_MODULE too.

Looks like usermodehelpers are configurable for both the inheritable
set and the bounding set via /proc/sys/kernel/usermodehelper/bset and
/proc/sys/kernel/usermodehelper/inheritable thanks to Eric Paris
(17f60a7da, available in 3.0-rc1).

>
> Cheers
>
> Andrew
>
> On Fri, Jul 15, 2011 at 11:14 AM, H. Peter Anvin <hpa@...or.com> wrote:
>> On 07/15/2011 11:13 AM, Mike Waychison wrote:
>>>
>>> So the question is, should this go in the kernel proper such that it
>>> manipulates the init_cred structure, or should this be plumbed down in
>>> kinit (in klibc, which we use for bootup)?
>>>
>>
>> It certainly would be trivial to do in kinit.
>>
>>        -hpa
>>
>> --
>> H. Peter Anvin, Intel Open Source Technology Center
>> I work for Intel.  I don't speak on their behalf.
>>
>>
>
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