From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <cr@cristianrodriguez.net>
Received: from mail-wr1-f53.google.com (mail-wr1-f53.google.com
 [209.85.221.53])
 by sourceware.org (Postfix) with ESMTPS id EB4E938582AE
 for <libc-alpha@sourceware.org>; Mon, 25 Jul 2022 18:33:17 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org EB4E938582AE
Received: by mail-wr1-f53.google.com with SMTP id h8so17196097wrw.1
 for <libc-alpha@sourceware.org>; Mon, 25 Jul 2022 11:33:17 -0700 (PDT)
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20210112;
 h=x-gm-message-state:mime-version:references:in-reply-to:from:date
 :message-id:subject:to:cc;
 bh=9+idQqBWdX5mURxuBE4eJRKFRCSZyA5bMwG+uu+jVjQ=;
 b=gsZuvvPGiRoI2o8JSr0E7poa4RRKkdxoNgKj4GgGb3kAdQ7ntFMfbLDZYS2Vu0caq8
 wAiSNrdzFqOhIEQHuVKTg8qhLb/Z6e63iCUqSJebehCerZEvtxu2/DbWQ4chjN/PIBdL
 SWzZVN2cfbKbPPfm9hxIFMAMShhnyq6TV1Mdtf4tnU0QRAn4hG9BeAT3Da3G/RX7NnD8
 yE+0qh0LIk0YiN8d3YnzfFcRDrcpMtFv57bb20nCRm2G6l8TurpmJXr1n346QotA5z6l
 n19DjX3Wvw0An6EinGA9S5gs2PoRtav879EmWvtMplcT5tT5+ShQ9xhEvPqfubgQsMpB
 yIFA==
X-Gm-Message-State: AJIora8cuZgX7As6zMq9sVpfy9cXalrQ28vc8J123IgzFlm3G/zoMnEi
 yBrno98vVNZwSwWM0Cdbn7aK9p3P4tSN7DpCIHT9sCp/3/E=
X-Google-Smtp-Source: AGRyM1vCQBlffxosb8FcohFVhZ2TyRzrfS+NGXNuzNr12iMwXx+yS5qzGF7Zz/f71RCgHnvZ9q+jc2xgbhfhELxpZew=
X-Received: by 2002:a5d:584f:0:b0:21d:bcd6:5c8e with SMTP id
 i15-20020a5d584f000000b0021dbcd65c8emr8287218wrf.60.1658773996917; Mon, 25
 Jul 2022 11:33:16 -0700 (PDT)
MIME-Version: 1.0
References: <YtwgTySJyky0OcgG@zx2c4.com> <Ytwg8YEJn+76h5g9@zx2c4.com>
 <6bf352e9-1312-40de-4733-3219721b343c@linaro.org>
 <20220725153303.GF7074@brightrain.aerifal.cx>
 <878rohp2ll.fsf@oldenburg.str.redhat.com>
 <20220725174430.GI7074@brightrain.aerifal.cx>
In-Reply-To: <20220725174430.GI7074@brightrain.aerifal.cx>
From: =?UTF-8?Q?Cristian_Rodr=C3=ADguez?= <crrodriguez@opensuse.org>
Date: Mon, 25 Jul 2022 14:33:05 -0400
Message-ID: <CAPBLoAe89Pwt=F_jcZirVXQA7JtugV+5+BWHBt0RaZka1y0K=g@mail.gmail.com>
Subject: Re: arc4random - are you sure we want these?
To: Rich Felker <dalias@libc.org>
Cc: Florian Weimer <fweimer@redhat.com>, Yann Droneaud <ydroneaud@opteya.com>,
 jann@thejh.net, 
 "Jason A. Donenfeld" <Jason@zx2c4.com>, libc-alpha@sourceware.org,
 Michael@phoronix.com
Content-Type: text/plain; charset="UTF-8"
X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00,
 HEADER_FROM_DIFFERENT_DOMAINS, KAM_DMARC_STATUS, RCVD_IN_DNSWL_NONE,
 RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_PASS,
 TXREP autolearn=no autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
 server2.sourceware.org
X-BeenThere: libc-alpha@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Libc-alpha mailing list <libc-alpha.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/libc-alpha>,
 <mailto:libc-alpha-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/libc-alpha/>
List-Post: <mailto:libc-alpha@sourceware.org>
List-Help: <mailto:libc-alpha-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/libc-alpha>,
 <mailto:libc-alpha-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Mon, 25 Jul 2022 18:33:20 -0000

On Mon, Jul 25, 2022 at 1:44 PM Rich Felker <dalias@libc.org> wrote:

> Then don't fallback to /dev/urandom.

Those are my thoughts as well.. but __libc_fatal() if there is no
usable getrandom syscall with the needed semantics, in short making
this interface usable only when the kernel is.

This is quite drastic, but probably the only sane way to go.