linux-kernel - Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()

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Message-ID: <87blvefai7.fsf@oldenburg2.str.redhat.com>
Date:   Sat, 21 Sep 2019 08:07:12 +0200
From:   Florian Weimer <fweimer@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        "Ahmed S. Darwish" <darwish.07@...il.com>,
        Lennart Poettering <mzxreary@...inter.de>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Alexander E. Patrakov" <patrakov@...il.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Willy Tarreau <w@....eu>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        linux-man <linux-man@...r.kernel.org>
Subject: Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()

* Linus Torvalds:

> Violently agreed. And that's kind of what the GRND_EXPLICIT is really
> aiming for.
>
> However, it's worth noting that nobody should ever use GRND_EXPLICIT
> directly. That's just the name for the bit. The actual users would use
> GRND_INSECURE or GRND_SECURE.

Should we switch glibc's getentropy to GRND_EXPLICIT?  Or something
else?

I don't think we want to print a kernel warning for this function.

Thanks,
Florian