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

[One Thousand Gnomes]

On Tue, 29 Nov 2016 14:03:31 +0000
David Howells <dhowells@xxxxxxxxxx> wrote:

> How about the attached?  Obviously it need extending to other drivers.
> 
> I thought that if I'm changing the module_param annotations anyway then it's
> probably worth bunging in an extra parameter that notes what the parameter
> modifies (ioport, iomem, etc.) for future reference, even if we don't store
> it.


With a security hat on the security best practice and long standing
accepted rule is that you whitelist rather than blacklist, so there ought
to be a 

module_param_safe_array()
etc

to mark parameters that are safe, not the reverse.


That debate aside I think the patch is exactly what is needed for this,
and is probably useful for more general hardening as well.

Alan