Messages in this thread | | | Subject | Re: [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE_RANDOM | From | Glen Turner <> | Date | Mon, 26 May 2008 00:39:49 +0930 |
| |
On Fri, 2008-05-16 at 21:55 -0700, Chris Peterson wrote: > * network drivers could use IRQF_SAMPLE_URANDOM
Is it permissable for /dev/urandom to degrade to be externally influenced by a hostile party?
For example, /dev/random has run out. So the output of /dev/urandom is now determined by previous values of /dev/random. I then send in a stack of network packets at regular intervals. So the output of /dev/urandom is now greatly determined by those packets. My search space for the resulting key is small since /dev/urandom appears to be random, but in fact is periodic.
I'll also note that there is a huge number of periodic packets seen by hosts on quiet networks -- such as a preparation VLAN where a system administrator might choose to run up a new machine.
| |