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SubjectRE: [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE_RANDOM
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Alan Cox wrote:
> Chris Peterson <cpeterso@cpeterso.com> wrote:
>> I know Jeff Garzik says he's not interested in an anti-entropy
>> pogrom for existing net drivers, but here is the patch if anyone
>> else is interested..? :)
>>
>> Only 12 net drivers are affected, the last of the
>> theoretically-exploitable network entropy.
>
> Looks fine to me. If Jeff doesn't want to touch them then send them
> direct to Andrew/Linus.
>
> A more interesting alternative might be to mark things like network
> drivers with a new flag say IRQF_SAMPLE_DUBIOUS so that users can be
> given a switch to enable/disable their use depending upon the
> environment.

we've been hearing rumblings of big customers wanting (maybe requiring)
wired network drivers from Intel to advertise this flag. Jeff have you
heard of such?

I think the argument is that a headless system (no keyboard/mouse, no
soundcard, probably no video) with a libata based driver and a network
driver without IRQF_SAMPLE_RANDOM has *no* sources of entropy. In this
case the argument is very strong for at least *some* source of entropy
from interrupts so that randomness can get some external input. Just
try rebuilding a kernel RPM over an ssh session and you'll see what I
mean.

In short, I agree with Alan's IRQF_SAMPLE_DUBIOUS, and know of Linux
customers who also want the same.


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