Re: module signing: Changing to MODULE_SIG_SHA3_512

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On Thu, Nov 9, 2023 at 8:03 AM Prarit Bhargava <prarit@xxxxxxxxxx> wrote:
>
> On 11/8/23 08:33, Prarit Bhargava wrote:
> > Hey everyone,
> >
> > The current kernel configs generate
> >
> > # CONFIG_MODULE_SIG_FORCE is not set
> > CONFIG_MODULE_SIG_ALL=y
> > # CONFIG_MODULE_SIG_SHA256 is not set
> > # CONFIG_MODULE_SIG_SHA384 is not set
> > CONFIG_MODULE_SIG_SHA512=y
> > # CONFIG_MODULE_SIG_SHA3_256 is not set
> > # CONFIG_MODULE_SIG_SHA3_384 is not set
> > # CONFIG_MODULE_SIG_SHA3_512 is not set
> > CONFIG_MODULE_SIG_HASH="sha512"
> >
> > With https://gitlab.com/cki-project/kernel-ark/-/merge_requests/2802
> >
> > we can strengthen the module signing algorithm to
> > CONFIG_MODULE_SIG_SHA3_512.
> >
> > I'd like to do this before Fedora40, as it will be the basis of
> > centos-stream-10 and RHEL10.
> >
> > Thoughts or concerns?
> >
> > P.
>
> I took a closer look at this and there doesn't appear to be an issue
> with doing this in the kernel.  Build times and boot times seem
> consistent before and after the change.
>
> However, depmod (from kmod) needs an update if we make this change.  The
> current fedora version of kmod, -31, segfaults in the modules_install
> target.  I ran the latest upstream version of kmod and AFAICT that works.
>
> I will wait for kmod to be updated to at least version -32 and then
> request that we change the module signing algorithm to SHA3_512, unless
> there any objections.

The latest kmod in fedora is -30.  I was just looking at packaging -31
today.  Are the above version numbers typos, or did you get kmod from
somewhere else?

josh
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