> > At the point you abuse these calls you can already just load arbitary
> > data from userspace anyway.
>
> So the possible exploit will only work when run by root, is that what you
> mean? If so isn't that still a security problem?
To exploit the hole you need CAP_SYS_RAWIO which is the highest
capability of all. CAP_SYS_RAWIO gives you the ability to access hardware
directly so since it checks for CAP_SYS_RAWIO it isn't security.
The patch isn't wrong however and adds some sanity checking so it would
do no harm to send it to Andrew for -mm testing.
Alan
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