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From:   Florian Weimer <fweimer@redhat.com>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Andy Lutomirski <luto@kernel.org>,
        "Ahmed S. Darwish" <darwish.07@gmail.com>,
        Lennart Poettering <mzxreary@0pointer.de>,
        "Theodore Y. Ts'o" <tytso@mit.edu>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        "Alexander E. Patrakov" <patrakov@gmail.com>,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Willy Tarreau <w@1wt.eu>,
        Matthew Garrett <mjg59@srcf.ucam.org>,
        lkml <linux-kernel@vger.kernel.org>,
        Ext4 Developers List <linux-ext4@vger.kernel.org>,
        Linux API <linux-api@vger.kernel.org>,
        linux-man <linux-man@vger.kernel.org>
Subject: Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()
References: <20190912034421.GA2085@darwi-home-pc>
        <20190912082530.GA27365@mit.edu>
        <CAHk-=wjyH910+JRBdZf_Y9G54c1M=LBF8NKXB6vJcm9XjLnRfg@mail.gmail.com>
        <20190914122500.GA1425@darwi-home-pc>
        <008f17bc-102b-e762-a17c-e2766d48f515@gmail.com>
        <20190915052242.GG19710@mit.edu>
        <CAHk-=wgg2T=3KxrO-BY3nHJgMEyApjnO3cwbQb_0vxsn9qKN8Q@mail.gmail.com>
        <20190918211503.GA1808@darwi-home-pc>
        <20190918211713.GA2225@darwi-home-pc>
        <CAHk-=wiCqDiU7SE3FLn2W26MS_voUAuqj5XFa1V_tiGTrrW-zQ@mail.gmail.com>
        <20190920134609.GA2113@pc>
        <CALCETrWvE5es3i+to33y6jw=Yf0Tw6ZfV-6QWjZT5v0fo76tWw@mail.gmail.com>
        <CAHk-=wgW8rN2EVL_Rdn63V9vQO0GkZ=RQFeqqsYJM==8fujpPg@mail.gmail.com>
        <CALCETrV=4TX2a4uV5t2xOFzv+zM_jnOtMLJna8Vb7uXz6S=wSw@mail.gmail.com>
        <CAHk-=wjpTWgpo6d24pTv+ubfea_uEomX-sHjjOkdACfV-8Nmkg@mail.gmail.com>
Date:   Sat, 21 Sep 2019 08:07:12 +0200
In-Reply-To: <CAHk-=wjpTWgpo6d24pTv+ubfea_uEomX-sHjjOkdACfV-8Nmkg@mail.gmail.com>
        (Linus Torvalds's message of "Fri, 20 Sep 2019 11:09:53 -0700")
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* 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