linux-kernel - Re: [RFC PATCH 2/2] docs: Update kernel-parameters.txt for signature verification enhancement

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Message-ID: <CAPp5cGRgDVFO2pes9ThOr+h_P_yF1aOFQbd1mYef-LvYawUjnQ@mail.gmail.com>
Date:   Thu, 9 Nov 2023 11:40:40 +0100
From:   Alessandro Carminati <alessandro.carminati@...il.com>
To:     Prarit Bhargava <prarit@...hat.com>
Cc:     linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luis Chamberlain <mcgrof@...nel.org>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] docs: Update kernel-parameters.txt for signature
 verification enhancement

Hello Prarit,

Il giorno mer 8 nov 2023 alle ore 16:33 Prarit Bhargava
<prarit@...hat.com> ha scritto:
>
> On 9/14/23 07:27, Alessandro Carminati (Red Hat) wrote:
> > Update kernel-parameters.txt to reflect new deferred signature
> > verification.
> > Enhances boot speed by allowing unsigned modules in initrd after
> > bootloader check.
> >
> > Signed-off-by: Alessandro Carminati (Red Hat) <alessandro.carminati@...il.com>
> > ---
> >   Documentation/admin-guide/kernel-parameters.txt | 9 +++++++++
> >   1 file changed, 9 insertions(+)
> >
> > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> > index 0c38a8af95ce..beec86f0dd05 100644
> > --- a/Documentation/admin-guide/kernel-parameters.txt
> > +++ b/Documentation/admin-guide/kernel-parameters.txt
> > @@ -3410,6 +3410,15 @@
> >                       Note that if CONFIG_MODULE_SIG_FORCE is set, that
> >                       is always true, so this option does nothing.
> >
> > +     module_sig_check_wait=
> > +                     This parameter enables delayed activation of module
> > +                     signature checks, deferring the process until userspace
> > +                     triggers it. Once activated, this setting becomes
> > +                     permanent and cannot be reversed. This feature proves
> > +                     valuable for incorporating unsigned modules within
> > +                     initrd, especially after bootloader verification.
> > +                     By employing this option, boot times can be quicker.
> > +
>
> Please keep these in alphabetical order.
>
> Would making the kernel-parameters.txt warning a little bit more
> informative be a good thing?  This should only be used in environments
> where some other signature verification method is employed.
>
> Also, for future reference, it would be good to have hard numbers to
> show the boot time improvement in the changelog.
I'll do the necessary adjustments in the v2, thank you for your feedback.
>
> P.
>
> >       module_blacklist=  [KNL] Do not load a comma-separated list of
> >                       modules.  Useful for debugging problem modules.
> >
>