linux-kernel - Re: [PATCH v1] random: block in /dev/urandom

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Message-ID: <YjsOHmvDgAxwLFMg@sirena.org.uk>
Date:   Wed, 23 Mar 2022 12:10:06 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-arch@...r.kernel.org, Dinh Nguyen <dinguyen@...nel.org>,
        Nick Hu <nickhu@...estech.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        "David S . Miller" <davem@...emloft.net>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Michal Simek <monstr@...str.eu>,
        Borislav Petkov <bp@...en8.de>, Guo Ren <guoren@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Joshua Kinard <kumba@...too.org>,
        David Laight <David.Laight@...lab.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Eric Biggers <ebiggers@...gle.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Lennart Poettering <mzxreary@...inter.de>,
        Konstantin Ryabitsev <konstantin@...uxfoundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH v1] random: block in /dev/urandom

On Tue, Mar 22, 2022 at 02:54:20PM -0700, Guenter Roeck wrote:
> On 3/22/22 11:24, Mark Brown wrote:

> > Just as a datapoint for debugging at least qemu/arm is getting coverage
> > in CI systems (KernelCI is covering a bunch of different emulated
> > machines and LKFT has at least one configuration as well, clang's tests
> > have some wider architecture coverage as well I think) and they don't
> > seem to be seeing any problems - there's some other variable in there.

> I use buildroot 2021.02.3. I have not changed the buildroot code, and it
> still seems to be the same in 2022.02. I don't see the problem with all
> boot tests, only with the architectures mentioned above, and not with all
> qemu machines on the affected platforms. For arm, mostly older machines
> are affected (versatile, realview, pxa configurations, collie, integratorcp,
> sx1, mps2-an385, vexpress-a9, cubieboard). I didn't check, but maybe
> kernelci doesn't test those machines ?

Kind of academic given that Jason seems to have a handle on what the
issues are but for KernelCI it's variations on mach-virt, plus
versatile-pb.  There's a physical cubietruck as well, and BeagleBone
Blacks among others.  My best guess would be systems with low RAM are
somehow more prone to issues.

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