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

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Date:   Sat, 23 Apr 2022 23:10:41 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        linux-arch <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

Hey Guenter,

On Sat, Apr 23, 2022 at 06:56:31AM -0700, Guenter Roeck wrote:
> Looks like your code is already in -next; I see the same failures in
> your tree and there.

So interestingly, none of the old issues are now present (the hangs on
versatilepb and such), so that's very positive. As for the crashes you
found:

> openrisc generates a warning backtrace.
> parisc crashes.
> s390 crashes silently, no crash log.

I've now fixed these too, and tested the fixes as well. Hopefully the
new jd/for-guenther branch has no regressions at all now... Knock on
wood.

Thanks a bunch for looking at this. Very much appreciated.

Jason