linux-kernel - Re: [PATCH v2 1/5] treewide: use prandom_u32

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Message-ID: <20221006162443.b66waqsxlntfeoek@quack3>
Date:   Thu, 6 Oct 2022 18:24:43 +0200
From:   Jan Kara <jack@...e.cz>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        Andreas Noever <andreas.noever@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>,
        Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>, Christoph Hellwig <hch@....de>,
        Daniel Borkmann <daniel@...earbox.net>,
        Dave Airlie <airlied@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Westphal <fw@...len.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Hugh Dickins <hughd@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        Jan Kara <jack@...e.com>, Jason Gunthorpe <jgg@...pe.ca>,
        Jens Axboe <axboe@...nel.dk>,
        Johannes Berg <johannes@...solutions.net>,
        Jonathan Corbet <corbet@....net>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        KP Singh <kpsingh@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Marco Elver <elver@...gle.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Paolo Abeni <pabeni@...hat.com>, Theodore Ts'o <tytso@....edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Thomas Graf <tgraf@...g.ch>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Yury Norov <yury.norov@...il.com>,
        dri-devel@...ts.freedesktop.org, kasan-dev@...glegroups.com,
        kernel-janitors@...r.kernel.org, linux-block@...r.kernel.org,
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        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2 1/5] treewide: use prandom_u32_max() when possible

On Thu 06-10-22 07:25:06, Jason A. Donenfeld wrote:
> Rather than incurring a division or requesting too many random bytes for
> the given range, use the prandom_u32_max() function, which only takes
> the minimum required bytes from the RNG and avoids divisions.
> 
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Reviewed-by: KP Singh <kpsingh@...nel.org>
> Reviewed-by: Christoph Böhmwalder <christoph.boehmwalder@...bit.com>
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>

Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

for the ext2, ext4, and lib/sbitmap.c bits.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR