linux-kernel - Re: Can KEY_DH_OPERATIONS become tristate? (was: Re: Kernel 5.3.0 stuck during boot on Amiga)

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Date:   Wed, 18 Sep 2019 16:54:17 +0100
From:   David Howells <dhowells@...hat.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     dhowells@...hat.com,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Michael Schmitz <schmitzmic@...il.com>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Can KEY_DH_OPERATIONS become tristate? (was: Re: Kernel 5.3.0 stuck during boot on Amiga)

Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> CC crypto keys people
> 
> TL;DR: CONFIG_CRYPTO_DH=y is reported to cause boot delays of several
> minutes on old and slow machines.

Why is it doing that?  It doesn't do anything unless it is called, so
something must be calling it.

> Can KEY_DH_OPERATIONS be made tristate?

Um.  It's non-trivial since it's implementing a keyctl() function for
userspace to call and there's currently no ops table to jump through.

David