From: Randy Dunlap <rdunlap@infradead.org> To: "Stephan Müller" <smueller@chronox.de>, "Arnd Bergmann" <arnd@arndb.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, linux-crypto@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>, linux-api@vger.kernel.org, "Eric W. Biederman" <ebiederm@xmission.com>, "Alexander E. Patrakov" <patrakov@gmail.com>, "Ahmed S. Darwish" <darwish.07@gmail.com>, "Theodore Y. Ts'o" <tytso@mit.edu>, Willy Tarreau <w@1wt.eu>, Matthew Garrett <mjg59@srcf.ucam.org>, Vito Caputo <vcaputo@pengaru.com>, Andreas Dilger <adilger.kernel@dilger.ca>, Jan Kara <jack@suse.cz>, Ray Strode <rstrode@redhat.com>, William Jon McCann <mccann@jhu.edu>, zhangjs <zachary@baishancloud.com>, Andy Lutomirski <luto@kernel.org>, Florian Weimer <fweimer@redhat.com>, Lennart Poettering <mzxreary@0pointer.de>, Nicolai Stange <nstange@suse.de>, "Peter, Matthias" <matthias.peter@bsi.bund.de>, Marcelo Henrique Cerri <marcelo.cerri@canonical.com>, Roman Drahtmueller <draht@schaltsekun.de>, Neil Horman <nhorman@redhat.com>, Julia Lawall <julia.lawall@inria.fr> Subject: Re: [PATCH v27 09/12] LRNG - add Jitter RNG fast noise source Date: Thu, 9 Jan 2020 16:24:47 -0800 Message-ID: <0ba976fa-fed1-4720-c039-043160dbce9e@infradead.org> (raw) In-Reply-To: <6341883.UacF4FzDma@positron.chronox.de> Hi, On 1/9/20 12:34 AM, Stephan Müller wrote: > --- > drivers/char/lrng/Kconfig | 11 +++++ > drivers/char/lrng/Makefile | 1 + > drivers/char/lrng/lrng_jent.c | 87 +++++++++++++++++++++++++++++++++++ > 3 files changed, 99 insertions(+) > create mode 100644 drivers/char/lrng/lrng_jent.c > > diff --git a/drivers/char/lrng/lrng_jent.c b/drivers/char/lrng/lrng_jent.c > new file mode 100644 > index 000000000000..97c0d192e9c8 > --- /dev/null > +++ b/drivers/char/lrng/lrng_jent.c > @@ -0,0 +1,87 @@ > +// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause > +/* > + * LRNG Fast Noise Source: Jitter RNG > + * > + * Copyright (C) 2016 - 2020, Stephan Mueller <smueller@chronox.de> > + */ > + > +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt > + > +#include <linux/types.h> > +#include <crypto/internal/jitterentropy.h> > + > +#include "lrng_internal.h" > + > +/* > + * Estimated entropy of data is a 16th of LRNG_DRNG_SECURITY_STRENGTH_BITS. > + * Albeit a full entropy assessment is provided for the noise source indicating > + * that it provides high entropy rates and considering that it deactivates > + * when it detects insufficient hardware, the chosen under estimation of > + * entropy is considered to be acceptable to all reviewers. > + */ > +static u32 jitterrng = LRNG_DRNG_SECURITY_STRENGTH_BITS>>4; > +module_param(jitterrng, uint, 0644); > +MODULE_PARM_DESC(jitterrng, "Entropy in bits of 256 data bits from Jitter " > + "RNG noise source"); > + > +/** > + * Get Jitter RNG entropy > + * > + * @outbuf buffer to store entropy > + * @outbuflen length of buffer > + * @return > 0 on success where value provides the added entropy in bits > + * 0 if no fast source was available > + */ Don't begin the comment block with /** or convert it to Linux kernel-doc notation format. > +static struct rand_data *lrng_jent_state; > + > +u32 lrng_get_jent(u8 *outbuf, unsigned int outbuflen) > +{ > + int ret; > + u32 ent_bits = jitterrng; > + unsigned long flags; > + static DEFINE_SPINLOCK(lrng_jent_lock); > + static int lrng_jent_initialized = 0; > + > + spin_lock_irqsave(&lrng_jent_lock, flags); > + > + if (!ent_bits || (lrng_jent_initialized == -1)) { > + spin_unlock_irqrestore(&lrng_jent_lock, flags); > + return 0; > + } > + > + if (!lrng_jent_initialized) { > + lrng_jent_state = jent_lrng_entropy_collector(); > + if (!lrng_jent_state) { > + jitterrng = 0; > + lrng_jent_initialized = -1; > + spin_unlock_irqrestore(&lrng_jent_lock, flags); > + pr_info("Jitter RNG unusable on current system\n"); > + return 0; > + } > + lrng_jent_initialized = 1; > + pr_debug("Jitter RNG working on current system\n"); > + } > + ret = jent_read_entropy(lrng_jent_state, outbuf, outbuflen); > + spin_unlock_irqrestore(&lrng_jent_lock, flags); > + > + if (ret) { > + pr_debug("Jitter RNG failed with %d\n", ret); > + return 0; > + } > + > + /* Obtain entropy statement */ > + if (outbuflen != LRNG_DRNG_SECURITY_STRENGTH_BYTES) > + ent_bits = (ent_bits * outbuflen<<3) / > + LRNG_DRNG_SECURITY_STRENGTH_BITS; > + /* Cap entropy to buffer size in bits */ > + ent_bits = min_t(u32, ent_bits, outbuflen<<3); > + pr_debug("obtained %u bits of entropy from Jitter RNG noise source\n", > + ent_bits); > + > + return ent_bits; > +} > + > +u32 lrng_jent_entropylevel(void) > +{ > + return min_t(u32, jitterrng, LRNG_DRNG_SECURITY_STRENGTH_BITS); > +} > thanks. -- ~Randy
next prev parent reply index Thread overview: 162+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-11-11 18:17 [PATCH v24 00/12] /dev/random - a new approach with full SP800-90B compliance Stephan Müller 2019-11-11 18:18 ` [PATCH v24 01/12] Linux Random Number Generator Stephan Müller 2019-11-11 23:54 ` Thomas Gleixner 2019-11-12 2:25 ` Stephan Müller 2019-11-12 10:16 ` Thomas Gleixner 2019-11-12 22:30 ` kbuild test robot 2019-11-12 23:15 ` Stephan Müller 2019-11-13 0:14 ` kbuild test robot 2019-11-13 0:25 ` Stephan Müller 2019-11-24 4:51 ` Sandy Harris 2019-11-24 9:02 ` Stephan Mueller 2019-11-11 18:19 ` [PATCH v24 02/12] LRNG - allocate one SDRNG instance per NUMA node Stephan Müller 2019-11-11 18:20 ` [PATCH v24 03/12] LRNG - /proc interface Stephan Müller 2019-11-11 18:20 ` [PATCH v24 04/12] LRNG - add switchable DRNG support Stephan Müller 2019-11-11 18:21 ` [PATCH v24 05/12] crypto: DRBG - externalize DRBG functions for LRNG Stephan Müller 2019-11-11 18:21 ` [PATCH v24 06/12] LRNG - add SP800-90A DRBG extension Stephan Müller 2019-11-11 18:22 ` [PATCH v24 07/12] LRNG - add kernel crypto API PRNG extension Stephan Müller 2019-11-11 18:23 ` [PATCH v24 08/12] crypto: provide access to a static Jitter RNG state Stephan Müller 2019-11-11 18:23 ` [PATCH v24 09/12] LRNG - add Jitter RNG fast noise source Stephan Müller 2019-11-11 18:24 ` [PATCH v24 10/12] LRNG - add TRNG support Stephan Müller 2019-11-11 18:26 ` [PATCH v24 11/12] LRNG - add SP800-90B compliant health tests Stephan Müller 2019-11-12 19:58 ` Alexander E. Patrakov 2019-11-12 23:11 ` Stephan Müller 2019-11-13 0:36 ` Stephan Müller 2019-11-13 6:02 ` Alexander E. Patrakov 2019-11-14 1:46 ` Stephan Müller 2019-11-11 18:26 ` [PATCH v24 12/12] LRNG - add interface for gathering of raw entropy Stephan Müller 2019-11-12 20:55 ` kbuild test robot 2019-11-12 23:13 ` Stephan Müller 2019-11-12 13:23 ` [PATCH v24 00/12] /dev/random - a new approach with full SP800-90B compliance Florian Weimer 2019-11-12 22:43 ` Stephan Müller 2019-11-12 15:33 ` Andy Lutomirski 2019-11-12 23:03 ` Stephan Müller 2019-11-12 23:26 ` Stephan Müller 2019-11-13 4:24 ` Stephan Müller 2019-11-13 4:48 ` Andy Lutomirski 2019-11-13 12:16 ` Stephan Müller 2019-11-16 9:32 ` [PATCH v25 00/12] /dev/random - a new approach with full SP800-90B Stephan Müller 2019-11-16 9:33 ` [PATCH v25 01/12] Linux Random Number Generator Stephan Müller 2019-11-16 11:25 ` Thomas Gleixner 2019-11-17 10:30 ` Stephan Müller 2019-11-16 18:13 ` Nicolai Stange 2019-11-17 11:01 ` Stephan Müller 2019-11-16 9:33 ` [PATCH v25 02/12] LRNG - allocate one SDRNG instance per NUMA node Stephan Müller 2019-11-16 9:34 ` [PATCH v25 03/12] LRNG - /proc interface Stephan Müller 2019-11-16 16:39 ` Andy Lutomirski 2019-11-17 12:16 ` Stephan Müller 2019-11-19 10:06 ` Andy Lutomirski 2019-11-19 10:55 ` Stephan Mueller 2019-11-19 17:40 ` Andy Lutomirski 2019-11-16 23:36 ` Eric W. Biederman 2019-11-17 11:37 ` Stephan Müller 2019-11-16 9:34 ` [PATCH v25 04/12] LRNG - add switchable DRNG support Stephan Müller 2019-11-16 9:35 ` [PATCH v25 05/12] crypto: DRBG - externalize DRBG functions for LRNG Stephan Müller 2019-11-16 9:35 ` [PATCH v25 06/12] LRNG - add SP800-90A DRBG extension Stephan Müller 2019-11-16 9:35 ` [PATCH v25 07/12] LRNG - add kernel crypto API PRNG extension Stephan Müller 2019-11-16 9:36 ` [PATCH v25 08/12] crypto: provide access to a static Jitter RNG state Stephan Müller 2019-11-16 9:36 ` [PATCH v25 09/12] LRNG - add Jitter RNG fast noise source Stephan Müller 2019-11-20 13:33 ` Neil Horman 2019-11-20 20:07 ` Stephan Müller 2019-11-21 14:19 ` Neil Horman 2019-11-21 14:33 ` Stephan Mueller 2019-11-16 9:37 ` [PATCH v25 10/12] LRNG - add TRNG support Stephan Müller 2019-11-16 16:09 ` Andy Lutomirski 2019-11-17 11:10 ` Stephan Müller 2019-11-19 10:07 ` Andy Lutomirski 2019-11-19 10:46 ` Stephan Mueller 2019-11-19 12:41 ` Greg Kroah-Hartman 2019-11-20 8:58 ` Stephan Müller 2019-11-20 9:55 ` Alexander E. Patrakov 2019-11-20 13:29 ` Greg Kroah-Hartman 2019-11-20 19:51 ` Stephan Müller 2019-11-20 19:57 ` Alexander E. Patrakov 2019-11-20 20:32 ` Greg Kroah-Hartman 2019-11-21 13:06 ` Stephan Müller 2019-11-16 9:37 ` [PATCH v25 11/12] LRNG - add SP800-90B compliant health tests Stephan Müller 2019-11-16 9:38 ` [PATCH v25 12/12] LRNG - add interface for gathering of raw entropy Stephan Müller 2019-11-16 16:51 ` Andy Lutomirski 2019-11-17 22:55 ` Stephan Müller 2019-11-19 10:04 ` Andy Lutomirski 2019-11-19 17:17 ` Randy Dunlap 2019-11-20 9:01 ` Stephan Müller 2019-11-21 12:18 ` Nicolai Stange 2019-11-21 15:18 ` Stephan Müller 2019-11-23 20:08 ` [PATCH v26 00/12] /dev/random - a new approach with full SP800-90B Stephan Müller 2019-11-23 20:10 ` [PATCH v26 01/12] Linux Random Number Generator Stephan Müller 2019-11-24 22:44 ` kbuild test robot 2019-11-25 6:29 ` Stephan Mueller 2019-11-23 20:10 ` [PATCH v26 02/12] LRNG - allocate one SDRNG instance per NUMA node Stephan Müller 2019-11-23 20:11 ` [PATCH v26 03/12] LRNG - sysctls and /proc interface Stephan Müller 2019-11-23 20:11 ` [PATCH v26 04/12] LRNG - add switchable DRNG support Stephan Müller 2019-11-23 20:31 ` [PATCH v26 05/12] crypto: DRBG - externalize DRBG functions for LRNG Stephan Müller 2019-11-23 20:32 ` [PATCH v26 06/12] LRNG - add SP800-90A DRBG extension Stephan Müller 2019-11-23 20:32 ` [PATCH v26 07/12] LRNG - add kernel crypto API PRNG extension Stephan Müller 2019-11-23 20:33 ` [PATCH v26 08/12] crypto: provide access to a static Jitter RNG state Stephan Müller 2019-11-23 20:34 ` [PATCH v26 09/12] LRNG - add Jitter RNG fast noise source Stephan Müller 2019-11-23 20:34 ` [PATCH v26 10/12] LRNG - add TRNG support Stephan Müller 2019-11-23 20:34 ` [PATCH v26 11/12] LRNG - add SP800-90B compliant health tests Stephan Müller 2019-11-23 20:35 ` [PATCH v26 12/12] LRNG - add interface for gathering of raw entropy Stephan Müller 2020-01-09 8:29 ` [PATCH v27 00/12] /dev/random - a new approach with full SP800-90B Stephan Müller 2020-01-09 8:30 ` [PATCH v27 01/12] Linux Random Number Generator Stephan Müller 2020-01-16 6:09 ` kbuild test robot 2020-01-16 6:41 ` Stephan Mueller 2020-01-09 8:31 ` [PATCH v27 02/12] LRNG - allocate one DRNG instance per NUMA node Stephan Müller 2020-01-09 8:31 ` [PATCH v27 03/12] LRNG - sysctls and /proc interface Stephan Müller 2020-01-09 8:32 ` [PATCH v27 04/12] LRNG - add switchable DRNG support Stephan Müller 2020-01-11 7:09 ` kbuild test robot 2020-01-12 10:12 ` Stephan Müller 2020-01-09 8:32 ` [PATCH v27 05/12] crypto: DRBG - externalize DRBG functions for LRNG Stephan Müller 2020-01-09 8:32 ` [PATCH v27 06/12] LRNG - add SP800-90A DRBG extension Stephan Müller 2020-01-09 8:33 ` [PATCH v27 07/12] LRNG - add kernel crypto API PRNG extension Stephan Müller 2020-01-09 8:33 ` [PATCH v27 08/12] crypto: provide access to a static Jitter RNG state Stephan Müller 2020-01-09 8:34 ` [PATCH v27 09/12] LRNG - add Jitter RNG fast noise source Stephan Müller 2020-01-10 0:24 ` Randy Dunlap [this message] 2020-01-10 7:45 ` Stephan Mueller 2020-01-09 8:34 ` [PATCH v27 10/12] LRNG - add SP800-90B compliant health tests Stephan Müller 2020-01-10 0:20 ` Randy Dunlap 2020-01-10 8:27 ` Stephan Mueller 2020-01-09 8:35 ` [PATCH v27 11/12] LRNG - add interface for gathering of raw entropy Stephan Müller 2020-01-09 8:35 ` [PATCH v27 12/12] LRNG - add power-on and runtime self-tests Stephan Müller 2020-01-10 0:22 ` Randy Dunlap 2020-01-10 7:48 ` Stephan Mueller 2020-01-13 10:39 ` Dan Carpenter 2020-01-13 10:46 ` Stephan Mueller 2020-01-15 10:31 ` [PATCH v28 00/12] /dev/random - a new approach with full SP800-90B Stephan Müller 2020-01-15 10:31 ` [PATCH v28 01/12] Linux Random Number Generator Stephan Müller 2020-01-16 0:11 ` Randy Dunlap 2020-01-16 7:22 ` Stephan Mueller 2020-01-15 10:32 ` [PATCH v28 02/12] LRNG - allocate one DRNG instance per NUMA node Stephan Müller 2020-01-15 10:32 ` [PATCH v28 03/12] LRNG - sysctls and /proc interface Stephan Müller 2020-01-15 10:32 ` [PATCH v28 04/12] LRNG - add switchable DRNG support Stephan Müller 2020-01-15 10:33 ` [PATCH v28 05/12] crypto: DRBG - externalize DRBG functions for LRNG Stephan Müller 2020-01-15 10:33 ` [PATCH v28 06/12] LRNG - add SP800-90A DRBG extension Stephan Müller 2020-01-16 0:14 ` Randy Dunlap 2020-01-16 6:55 ` Stephan Mueller 2020-01-15 10:34 ` [PATCH v28 07/12] LRNG - add kernel crypto API PRNG extension Stephan Müller 2020-01-16 0:15 ` Randy Dunlap 2020-01-16 6:54 ` Stephan Mueller 2020-01-15 10:34 ` [PATCH v28 08/12] crypto: provide access to a static Jitter RNG state Stephan Müller 2020-01-15 10:34 ` [PATCH v28 09/12] LRNG - add Jitter RNG fast noise source Stephan Müller 2020-01-16 0:17 ` Randy Dunlap 2020-01-16 6:51 ` Stephan Mueller 2020-01-15 10:35 ` [PATCH v28 10/12] LRNG - add SP800-90B compliant health tests Stephan Müller 2020-01-15 10:35 ` [PATCH v28 11/12] LRNG - add interface for gathering of raw entropy Stephan Müller 2020-01-16 0:18 ` Randy Dunlap 2020-01-16 6:43 ` Stephan Mueller 2020-01-16 6:48 ` Randy Dunlap 2020-01-16 6:52 ` Stephan Mueller 2020-01-15 10:36 ` [PATCH v28 12/12] LRNG - add power-on and runtime self-tests Stephan Müller 2020-01-19 21:12 ` [PATCH v29 00/12] /dev/random - a new approach with full SP800-90B Stephan Müller 2020-01-19 21:13 ` [PATCH v29 01/12] Linux Random Number Generator Stephan Müller 2020-01-19 21:13 ` [PATCH v29 02/12] LRNG - allocate one DRNG instance per NUMA node Stephan Müller 2020-01-19 21:14 ` [PATCH v29 03/12] LRNG - sysctls and /proc interface Stephan Müller 2020-01-19 21:14 ` [PATCH v29 04/12] LRNG - add switchable DRNG support Stephan Müller 2020-01-19 21:15 ` [PATCH v29 05/12] crypto: DRBG - externalize DRBG functions for LRNG Stephan Müller 2020-01-19 21:16 ` [PATCH v29 06/12] LRNG - add SP800-90A DRBG extension Stephan Müller 2020-01-19 21:16 ` [PATCH v29 07/12] LRNG - add kernel crypto API PRNG extension Stephan Müller 2020-01-19 21:17 ` [PATCH v29 08/12] crypto: provide access to a static Jitter RNG state Stephan Müller 2020-01-19 21:18 ` [PATCH v29 09/12] LRNG - add Jitter RNG fast noise source Stephan Müller 2020-01-19 21:18 ` [PATCH v29 10/12] LRNG - add SP800-90B compliant health tests Stephan Müller 2020-01-19 21:19 ` [PATCH v29 11/12] LRNG - add interface for gathering of raw entropy Stephan Müller 2020-01-19 21:20 ` [PATCH v29 12/12] LRNG - add power-on and runtime self-tests Stephan Müller
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