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Date: Fri, 27 May 2022 15:38:33 -0700 From: Guenter Roeck <linux@...ck-us.net> To: "Jason A. Donenfeld" <Jason@...c4.com> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Pavel Machek <pavel@...x.de>, Chris.Paterson2@...esas.com, linux-kernel@...r.kernel.org, stable@...r.kernel.org, torvalds@...ux-foundation.org, akpm@...ux-foundation.org, shuah@...nel.org, patches@...nelci.org, lkft-triage@...ts.linaro.org, jonathanh@...dia.com, f.fainelli@...il.com, sudipm.mukherjee@...il.com, slade@...dewatkins.com Subject: Re: [PATCH 5.10 000/163] 5.10.119-rc1 review On Fri, May 27, 2022 at 11:10:35PM +0200, Jason A. Donenfeld wrote: > Hi Guenter, > > On Fri, May 27, 2022 at 09:59:14AM -0700, Guenter Roeck wrote: > > Given that we (ChromeOS) have been hit by rng related > > issues before (specifically boot stalls on some hardware), I am quite > > concerned about the possible impact of this series for stable releases. > > The urandom try_to_generate_entropy() change from 5.18 wasn't backported. > Was it not backported on purpose or is it missing ? Thanks, Guenter > zx2c4@...nkpad ~/Projects/random-linux $ git diff linux-5.10.y:drivers/char/random.c master:drivers/char/random.c > [...snip...] > @@ -1292,6 +1311,13 @@ static ssize_t urandom_read_iter(struct kiocb *kiocb, struct iov_iter *iter) > { > static int maxwarn = 10; > > + /* > + * Opportunistically attempt to initialize the RNG on platforms that > + * have fast cycle counters, but don't (for now) require it to succeed. > + */ > + if (!crng_ready()) > + try_to_generate_entropy(); > + > if (!crng_ready()) { > if (!ratelimit_disable && maxwarn <= 0) > ++urandom_warning.missed; > > > > Jason
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