Re: [PATCH v2 0/4] rpmb subsystem, uapi and virtio-rpmb driver

[Ilias Apalodimas]

On Thu, 1 Jun 2023 at 08:49, Sumit Garg <sumit.garg@xxxxxxxxxx> wrote:
>
> On Thu, 1 Jun 2023 at 11:02, Ilias Apalodimas
> <ilias.apalodimas@xxxxxxxxxx> wrote:
> >
> > Hi Bing
> >
> > On Thu, 1 Jun 2023 at 04:03, Zhu, Bing <bing.zhu@xxxxxxxxx> wrote:
> > >
> > > As an alternative, Is it possible to change ftpm design not to depend on RPMB access at the earlier/boot stage? Because to my understanding, typically PCRs don't require persistent/NV storage (for example, before RPMB or tee-supplicant is ready, use TEE memory instead as temporary storage)
> >
> > I am not entirely sure this will solve our problem here.  You are
> > right that we shouldn't depend on the supplicant to extend PCRs. But
> > what happens if an object is sealed against certain PCR values?  We
> > are back to the same problem
>
> +1
>
> Temporary storage may be a stop gap solution for some use-cases but
> having a fast path access to RPMB via kernel should be our final goal.
> I would suggest we start small with the MMC subsystem to expose RPMB
> access APIs for OP-TEE driver rather than a complete RPMB subsystem.

I discussed with the OP-TEE maintainers about adding parts of the
supplicant in the kernel.  The supplicant 'just' sends an ioctl to
store/read stuff anyway.  So it would make sense to have a closer and
see if that looks reasonable.
Thanks

/Ilias

>
> -Sumit
>
> >
> > Thanks
> > /Ilias
> > >
> > > Bing
> > >
> > > IPAS Security Brown Belt (https://www.credly.com/badges/69ea809f-3a96-4bc7-bb2f-442c1b17af26)
> > > System Software Engineering
> > > Software and Advanced Technology Group
> > > Zizhu Science Park, Shanghai, China
> > >
> > > -----Original Message-----
> > > From: Shyam Saini <shyamsaini@xxxxxxxxxxxxxxxxxxx>
> > > Sent: Thursday, June 1, 2023 3:10 AM
> > > To: alex.bennee@xxxxxxxxxx
> > > Cc: code@xxxxxxxxxxx; Matti.Moell@xxxxxxxxxxxxxxx; arnd@xxxxxxxxxx; Zhu, Bing <bing.zhu@xxxxxxxxx>; hmo@xxxxxxxxxxxxxxx; ilias.apalodimas@xxxxxxxxxx; joakim.bech@xxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-mmc@xxxxxxxxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx; maxim.uvarov@xxxxxxxxxx; ruchika.gupta@xxxxxxxxxx; Winkler, Tomas <tomas.winkler@xxxxxxxxx>; ulf.hansson@xxxxxxxxxx; Huang, Yang <yang.huang@xxxxxxxxx>; sumit.garg@xxxxxxxxxx; jens.wiklander@xxxxxxxxxx; op-tee@xxxxxxxxxxxxxxxxxxxxxxxxx
> > > Subject: [PATCH v2 0/4] rpmb subsystem, uapi and virtio-rpmb driver
> > >
> > > Hi Alex,
> > >
> > > [ Resending, Sorry for the noise ]
> > >
> > > Are you still working on it or planning to resubmit it ?
> > >
> > > [1] The current optee tee kernel driver implementation doesn't work when IMA is used with optee implemented ftpm.
> > >
> > > The ftpm has dependency on tee-supplicant which comes once the user space is up and running and IMA attestation happens at boot time and it requires to extend ftpm PCRs.
> > >
> > > But IMA can't use PCRs if ftpm use secure emmc RPMB partition. As optee can only access RPMB via tee-supplicant(user space). So, there should be a fast path to allow optee os to access the RPMB parititon without waiting for user-space tee supplicant.
> > >
> > > To achieve this fast path linux optee driver and mmc driver needs some work and finally it will need RPMB driver which you posted.
> > >
> > > Please let me know what's your plan on this.
> > >
> > > [1] https://optee.readthedocs.io/en/latest/architecture/secure_storage.html
> > >
> > > Best Regards,
> > > Shyam