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Hello,

On Nov 16, 2006, at 23:07, Thor Lancelot Simon wrote:

> On Thu, Nov 16, 2006 at 06:24:16PM -0500, Michael Lorenz wrote:
>>
>> Argh, I knew I forgot something.
>> The original radeonfb didn't allow mmap()ing any PCI resources, so I
>> added support for that but made it optional to avoid breaking the
>> behaviour the author intended.
>> So what's missing in GENERIC is
>> options		RADEONFB_MMAP_BARS
>
> Will Xwsfb work without this option?

Supposedly it does, although I never tried it.

>   If I understand what it does correctly, it is wildly insecure.

Depends - the BAR mappings should be restricted to processes with root 
credentials, only the 'canonical' framebuffer mapping at offset 0 
should be accessible to everyone who can play with ttyE0.
To avoid misunderstanding - we're talking about mmap()ing PCI resources 
belonging to the console wsdisplay device - and only those - via ttyE0, 
not /dev/mem or something.

have fun
Michael
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