Re: TPM 2.0 Linux sysfs interface

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On Mon, Sep 02, 2019 at 05:35:18PM -0400, Mimi Zohar wrote:
> On Mon, 2019-09-02 at 16:26 -0300, Jason Gunthorpe wrote:
> > On Fri, Aug 30, 2019 at 02:20:54PM -0700, Tadeusz Struk wrote:
> > > On 8/28/19 9:15 AM, Jason Gunthorpe wrote:
> > > >>> So exposing PCRs and things through sysfs is not going to happen.
> > > >>>
> > > >>> If you had some very narrowly defined things like version, then
> > > >>> *maybe* but I think a well defined use case is needed for why this
> > > >>> needs to be sysfs and can't be done in C as Jarkko explained.
> > > >> Piotr's request for a sysfs file to differentiate between TPM 1.2 and
> > > >> TPM 2.0 is a reasonable request and probably could be implemented on
> > > >> TPM registration.
> > > >>
> > > >> If exposing the PCRs through sysfs is not acceptable, then perhaps
> > > >> suggest an alternative.
> > > > Use the char dev, this is exactly what is is for.
> > > 
> > > What about a new /proc entry?
> > > Currently there are /proc/cpuinfo, /proc/meminfo, /proc/slabinfo...
> > > What about adding a new /proc/tpminfo that would print info like
> > > version, number of enabled PCR banks, physical interface [tis|crb],
> > > vendor, etc.
> > 
> > I thought we were not really doing new proc entries?
> > 
> > Why this focus on making some textual output?
> 
> I don't really care if we define procfs, sysfs, or securityfs file(s)
> or whether those files are ascii or binary.  Whatever is defined,
> should be defined for both TPM 1.2 and TPM 2.0 (eg. TPM version).

Use an ioctl on the char dev?

Jason



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