On Mon, 2018-03-12 at 17:05 -0600, Jason Gunthorpe wrote: > On Mon, Mar 12, 2018 at 06:58:45PM -0400, Mimi Zohar wrote: > > On Mon, 2018-03-12 at 15:59 -0600, Jason Gunthorpe wrote: > > > On Mon, Mar 12, 2018 at 05:53:18PM -0400, Mimi Zohar wrote: > > > > > > > Using Kconfig to force the TPM to be builtin is not required, but > > > > helpful. Users interested in IMA-measurement could configure the TPM > > > > as builtin themselves. Without the TPM builtin, IMA goes into TPM- > > > > bypass mode. > > > > > > This issues, broadly speaking, we have lots of TPM drivers, selecting > > > only some to actually support IMA shows we have some kind of problem > > > here. > > > > True, IMA is not selecting the older TPM vendor specific modules, but > > only the newer TPM_TIS and now TPM_CRB modules. That doesn't imply > > that IMA only supports some TPMs. It means that by default, these > > TPMs are builtin. Anyone building a kernel, can select the vendor > > specific TPM to be builtin. > > That doesn't help distros, which is the main point of the complaint > with this scheme :) Years ago because of faulty TPM drivers, IMA was disabled in one of the main distro's. Deciding which vendor specific TPMs should be builtin, is a discussion between the distro's and TPM vendors. Mimi
