linux-kernel - Re: 2.6.37-rc7: Regression: b43: crashes in hwrng

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Date:	Tue, 4 Jan 2011 13:57:22 +0100
From:	"Mario 'BitKoenig' Holbe" <Mario.Holbe@...Ilmenau.DE>
To:	Herbert Xu <herbert@...dor.hengli.com.au>
Cc:	Larry Finger <Larry.Finger@...inger.net>,
	Matt Mackall <mpm@...enic.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
	Harald Welte <HaraldWelte@...tech.com>,
	Michal Ludvig <michal@...ix.cz>
Subject: Re: 2.6.37-rc7: Regression: b43: crashes in hwrng_register()

On Tue, Jan 04, 2011 at 11:38:24PM +1100, Herbert Xu wrote:
> On Tue, Jan 04, 2011 at 01:19:57PM +0100, Mario 'BitKoenig' Holbe wrote:
> >
> > Hmmm, yes - the patch fixes the crashes, i.e. no more crashes with
> > either sequence of module-loading, cat rng_available works as well,
> > but...
> > 
> > Having this patch active rngd complains:
> > 	rngd[1435]: rngd 2-unofficial-mt.13 starting up...
> > 	rngd[1435]: block failed FIPS test: 0x1f
> > 	rngd[1435]: block failed FIPS test: 0x1f
> > 	...
> > 	rngd[1435]: stats: entropy added to kernel pool: 0
> > 	rngd[1435]: stats: FIPS 140-2 successes: 0
> > 	rngd[1435]: stats: FIPS 140-2 failures: 10
> > 
> > It doesn't do this without the patch.
> > The only available rng was via, I did blacklist the others just to be
> > sure.
> 
> Hmm, can you print out what it's actually producing (e.g., by
> stracing rngd)?

# ps -ef | grep 'rng[d]'
# cat /sys/devices/virtual/misc/hw_random/rng_available
via 
# hexdump -n 512 -C /dev/hwrng
00000000  00 ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
00000010  ff ff ff ff ff ff ff 00  00 00 00 00 00 00 00 00  |................|
00000020  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000200
# hexdump -n 512 -C /dev/hwrng
00000000  00 ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
00000010  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
00000070  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000200
# hexdump -n 1024 -C /dev/hwrng
00000000  00 ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
00000010  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
00000060  ff ff ff ff 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000070  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000400
# hexdump -n 1024 -C /dev/hwrng
00000000  00 ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
00000010  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
00000070  ff 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000080  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000400
#                                                                                                                          
> Can you also double-check that this doesn't happen with Larry's
> patch?

Nope, it doesn't do this with Larry's patch.


Mario
-- 
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