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Message-ID: <Y0TcOH/BDfg5c1gj@zx2c4.com>
Date:   Mon, 10 Oct 2022 21:00:08 -0600
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     "Elliott, Robert (Servers)" <elliott@....com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "patches@...ts.linux.dev" <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>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>, Christoph Hellwig <hch@....de>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        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>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Helge Deller <deller@....de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Huacai Chen <chenhuacai@...nel.org>,
        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>,
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        KP Singh <kpsingh@...nel.org>,
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        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Paolo Abeni <pabeni@...hat.com>,
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        Richard Weinberger <richard@....at>,
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        Theodore Ts'o <tytso@....edu>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Thomas Graf <tgraf@...g.ch>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        WANG Xuerui <kernel@...0n.name>, Will Deacon <will@...nel.org>,
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        <linux-arm-kernel@...ts.infradead.org>,
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        Toke Høiland-Jørgensen <toke@...e.dk>
Subject: Re: [PATCH v6 3/7] treewide: use get_random_{u8,u16}() when
 possible, part 1

On Tue, Oct 11, 2022 at 01:18:40AM +0000, Elliott, Robert (Servers) wrote:
> 
> > diff --git a/crypto/testmgr.c b/crypto/testmgr.c
> ...
> > @@ -944,7 +944,7 @@ static void generate_random_bytes(u8 *buf, size_t count)
> >  	default:
> >  		/* Fully random bytes */
> >  		for (i = 0; i < count; i++)
> > -			buf[i] = (u8)prandom_u32();
> > +			buf[i] = get_random_u8();
> 
> Should that whole for loop be replaced with this?
>     get_random_bytes(buf, count);

Wow, that's kind of grotesque. Yea, it certainly should. But that's
beyond the scope of this patchset. I'll send a follow-up patch just for
this case to Herbert after this cleanup lands, though.

Jason

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