Messages in this thread |  | | Date | Fri, 16 Aug 2002 11:33:49 -0500 | From | Oliver Xymoron <> | Subject | Re: Problem with random.c and PPC |
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On Thu, Aug 15, 2002 at 06:50:32PM -0700, H. Peter Anvin wrote: > Followup to: <20020815210449.GA26993@opus.bloom.county> > By author: Tom Rini <trini@kernel.crashing.org> > In newsgroup: linux.dev.kernel > > > > Ah, thanks. In that case, no. It doesn't look like the input-layer USB > > keyboards contribute to entropy (but mice do), and I don't think the ADB > > ones do. I'll take a crack at adding this to keyboards monday maybe. > > > > Be careful... USB devices are *always* going to speak at the same > place in the USB cycle... I believe that is 1 ms. Thus, > submillisecond resolution is *not* random.
Currently not a problem for anyone except X86, as they'll only use HZ resolution. But the same problem exists on regular mice and keyboards, which are typically scanned for events at a fixed rate.
This is just the tip of the iceberg for problems with entropy accounting. I've got some free time today, I'll try to clean up my patches for this.
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