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Date: Tue, 18 Oct 2016 11:06:43 -0700
From: Kees Cook <keescook@...omium.org>
To: Mark Rutland <mark.rutland@....com>
Cc: AKASHI Takahiro <takahiro.akashi@...aro.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] module: add 'module_ronx=off' boot
cmdline parameter to disable ro/nx module mappings
On Tue, Oct 18, 2016 at 6:34 AM, Mark Rutland <mark.rutland@....com> wrote:
> Hi,
>
> On Tue, Oct 18, 2016 at 03:09:51PM +0900, AKASHI Takahiro wrote:
>> As making CONFIG_DEBUG_RODATA mandatory is a good idea, so will be
>> for CONFIG_SET_MODULE_RONX.
>
> I completely agree, given most distros ship a large number of drivers as
> modules...
>
>> This patch adds a command line parameter, "module_ronx=," in order to
>> make this configuration always on in the future, but still allowing for
>> disabling read-only module mappings at boot time as "rodata=" does.
>>
>> I have, however, some concerns on this prototype:
>> (1) should we use a separate parameter like "module_ronx=," or
>> unify it with "rodata="?
>
> I think this should be merged with "rodata=".
Agreed: it's really just a development artifact that these configs are
separate to begin with, so I think we should continue to consolidate
and merge it with "rodata=".
-Kees
--
Kees Cook
Nexus Security
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