linux-kernel - Re: [PATCH] Lock down drivers that can have io ports, io mem, irqs and dma changed

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Date:   Wed, 23 Nov 2016 12:58:26 +0000
From:   David Howells <dhowells@...hat.com>
To:     Dominik Brodowski <linux@...inikbrodowski.net>
Cc:     dhowells@...hat.com, keyrings@...r.kernel.org,
        matthew.garrett@...ula.com, linux-security-module@...r.kernel.org,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        gnomes@...rguk.ukuu.org.uk
Subject: Re: [PATCH] Lock down drivers that can have io ports, io mem, irqs and dma changed

Dominik Brodowski <linux@...inikbrodowski.net> wrote:

> You might also need to disable CIS overrides and CIS firmware loading for
> PCMCIA drivers, I presume. That needs two changes:
> 
> 	- Abort in drivers/pcmcia/ds.c::pcmcia_load_firmware() or disable
> 	  the CONFIG_PCMCIA_LOAD_CIS config option permanently.

This really ought to be handled through signature checking in
request_firmware().

> 	- Abort in drivers/pcmcia/cistpl.c::pccard_store_cis() or remove
> 	  write access to the "cis" file in
> 	  drivers/pcmcia/cistpl.c::pccard_cis_attr

What is that doing?  Allowing the device to be reconfigured?

David