[systemd-devel] Permanently remove services

[Mantas Mikulėnas]

On Fri, Jan 19, 2024, 19:12 Morten Bo Johansen <mortenbo at hotmail.com> wrote:

> On 2024-01-19 Mantas Mikulėnas wrote:
>
> > In general I've learned to not quite trust what the firmware shows...
> we've
> > had a batch of Skylake-or-so desktops that *did* have a CPU-integrated
> fTPM
> > but it wasn't even mentioned until we did a BIOS update, even though CPU
> > spec said it should be present.
> >
> > However, your CPU is from Haswell era and according to the spec sheet it
> > definitely seems to lack Intel's PTT "built-in TPM 2.0" feature (it has
> the
> > older IPT but that's a different thing, not a TPM equivalent), so that
> > seems correct. If I understand correctly, the only option for that CPU
> > would be a discrete TPM chip, and if the manufacturer had bothered to
> > include one, it ought to be showing up in the BIOS settings.
> >
> > On the other hand, you said you have a /dev/tpm0... I'm somewhat curious
> > about whether there are any mentions 'tpm' or 'tis' or something like
> that
> > in your `dmesg`?
>
> ~/ % dmesg | grep -i tpm
>
> [    0.275738] tpm_tis 00:05: 1.2 TPM (device-id 0x0, rev-id 78)
>

Well, that also looks like a TPM1.2 is present; it matches the absence of
/dev/tpmrm0 (which is a 2.0 thing).

(It's not very useful in general; I've used it to store my SSH key in the
past, but it's slow and only does RSA-2048, and the software is completely
different from what's used for newer variants. You can use it through
TrouSerS + OpenCryptoki.)

I wonder what makes systemd think it's a 2.0.
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