>> In drivers/char/mem.c there's open_port(), which is used as open_mem()
>> and open_kmem() as well. I don't see the benefit of this, since
>> /dev/mem and /dev/kmem are already protected by filesystem
>> permissions.
>>
> capabilities can be stricter than filesystem permissions
Which means, it prevents me from giving access to /dev/kmem to an
otherwise unprivileged process.
> , and the call
> is needed to update the PF_SUPERPRIV process flag.
What exactly is PF_SUPERPRIV good for? I see no real use in the
source. There is exactly one test for this flag (kernel/acct.c:336),
then sets another flag (ASU), which in turn is used nowhere else.
So, I think we could get rid of this flag as well. Comments?
Regards, Olaf.
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