linux-kernel - Re: [PATCH v3 3/3] treewide: use get_random_u32

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Message-ID: <Y3axaspOlt/oEDhw@zx2c4.com>
Date:   Thu, 17 Nov 2022 23:10:50 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Richard Weinberger <richard@....at>,
        "Darrick J . Wong" <djwong@...nel.org>,
        SeongJae Park <sj@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Helge Deller <deller@....de>, netdev@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-mmc@...r.kernel.org, linux-parisc@...r.kernel.org
Subject: Re: [PATCH v3 3/3] treewide: use get_random_u32_inclusive() when
 possible

On Thu, Nov 17, 2022 at 01:57:13PM -0800, Kees Cook wrote:
> The only comment I have is that maybe these cases can just be left as-is
> with _below()?
> 
> > -             size_t len = get_random_u32_below(rs) + gs;
> > +             size_t len = get_random_u32_inclusive(gs, rs + gs - 1);
> 
> It seems like writing it in the form of base plus [0, limit) is clearer?
> 
> 		size_t len = gs + get_random_u32_below(rs);
> 
> But there is only a handful, so *shrug*

Okay, I'll drop that one.

Jason