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Subject: Re: [PATCH v28 11/12] LRNG - add interface for gathering of raw
 entropy
To:     =?UTF-8?Q?Stephan_M=c3=bcller?= <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>,
        Dan Carpenter <dan.carpenter@oracle.com>
References: <6157374.ptSnyUpaCn@positron.chronox.de>
 <2641155.iNH938UiKq@positron.chronox.de>
 <5951792.lmNsirYsPE@positron.chronox.de>
 <2048458.ADJAtTWDj8@positron.chronox.de>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <abde84fe-2599-0db8-2bad-d2ff29a3c4f0@infradead.org>
Date:   Wed, 15 Jan 2020 16:18:18 -0800
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On 1/15/20 2:35 AM, Stephan Müller wrote:

> 
> CC: "Eric W. Biederman" <ebiederm@xmission.com>
> CC: "Alexander E. Patrakov" <patrakov@gmail.com>
> CC: "Ahmed S. Darwish" <darwish.07@gmail.com>
> CC: "Theodore Y. Ts'o" <tytso@mit.edu>
> CC: Willy Tarreau <w@1wt.eu>
> CC: Matthew Garrett <mjg59@srcf.ucam.org>
> CC: Vito Caputo <vcaputo@pengaru.com>
> CC: Andreas Dilger <adilger.kernel@dilger.ca>
> CC: Jan Kara <jack@suse.cz>
> CC: Ray Strode <rstrode@redhat.com>
> CC: William Jon McCann <mccann@jhu.edu>
> CC: zhangjs <zachary@baishancloud.com>
> CC: Andy Lutomirski <luto@kernel.org>
> CC: Florian Weimer <fweimer@redhat.com>
> CC: Lennart Poettering <mzxreary@0pointer.de>
> CC: Nicolai Stange <nstange@suse.de>
> Reviewed-by: Roman Drahtmueller <draht@schaltsekun.de>
> Tested-by: Roman Drahtmüller <draht@schaltsekun.de>
> Tested-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
> Tested-by: Neil Horman <nhorman@redhat.com>
> Signed-off-by: Stephan Mueller <smueller@chronox.de>
> ---
>  drivers/char/lrng/Kconfig        |  16 ++
>  drivers/char/lrng/Makefile       |   1 +
>  drivers/char/lrng/lrng_testing.c | 271 +++++++++++++++++++++++++++++++
>  3 files changed, 288 insertions(+)
>  create mode 100644 drivers/char/lrng/lrng_testing.c
> 

> diff --git a/drivers/char/lrng/lrng_testing.c b/drivers/char/lrng/lrng_testing.c
> new file mode 100644
> index 000000000000..0e287eccd622
> --- /dev/null
> +++ b/drivers/char/lrng/lrng_testing.c
> @@ -0,0 +1,271 @@
> +// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
> +/*
> + * Linux Random Number Generator (LRNG) Raw entropy collection tool
> + *
> + * Copyright (C) 2019 - 2020, Stephan Mueller <smueller@chronox.de>
> + */
> +
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include <linux/atomic.h>
> +#include <linux/bug.h>
> +#include <linux/debugfs.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/sched/signal.h>
> +#include <linux/slab.h>
> +#include <linux/string.h>
> +#include <linux/types.h>
> +#include <linux/uaccess.h>
> +#include <linux/workqueue.h>
> +#include <asm/errno.h>
> +
> +#include "lrng_internal.h"
> +
> +#define LRNG_TESTING_RINGBUFFER_SIZE	1024
> +#define LRNG_TESTING_RINGBUFFER_MASK	(LRNG_TESTING_RINGBUFFER_SIZE - 1)
> +
> +static u32 lrng_testing_rb[LRNG_TESTING_RINGBUFFER_SIZE];
> +static u32 lrng_rb_reader = 0;
> +static u32 lrng_rb_writer = 0;
> +static atomic_t lrng_testing_enabled = ATOMIC_INIT(0);
> +
> +static DECLARE_WAIT_QUEUE_HEAD(lrng_raw_read_wait);
> +static DEFINE_SPINLOCK(lrng_raw_lock);
> +
> +/*
> + * 0 ==> No boot test, gathering of runtime data allowed
> + * 1 ==> Boot test enabled and ready for collecting data, gathering runtime
> + *	 data is disabled
> + * 2 ==> Boot test completed and disabled, gathering of runtime data is
> + *	 disabled
> + */
> +static u32 boot_test = 0;
> +module_param(boot_test, uint, 0644);
> +MODULE_PARM_DESC(boot_test, "Enable gathering boot time entropy of the first"
> +			    " entropy events");

One line for the string, please.


-- 
~Randy
Reported-by: Randy Dunlap <rdunlap@infradead.org>