On Wed, 21 Apr 2021 at 22:51, James Bottomley <jejb@xxxxxxxxxxxxx> wrote: > > On Wed, 2021-04-21 at 16:38 +0530, Sumit Garg wrote: > > Hi James, > > > > On Wed, 21 Apr 2021 at 04:47, James Bottomley <jejb@xxxxxxxxxxxxx> > > wrote: > > > On Mon, 2021-03-01 at 18:41 +0530, Sumit Garg wrote: > > > > Current trusted keys framework is tightly coupled to use TPM > > > > device as an underlying implementation which makes it difficult > > > > for implementations like Trusted Execution Environment (TEE) etc. > > > > to provide trusted keys support in case platform doesn't posses a > > > > TPM device. > > > > > > > > Add a generic trusted keys framework where underlying > > > > implementations can be easily plugged in. Create struct > > > > trusted_key_ops to achieve this, which contains necessary > > > > functions of a backend. > > > > > > > > Also, define a module parameter in order to select a particular > > > > trust source in case a platform support multiple trust sources. > > > > In case its not specified then implementation itetrates through > > > > trust sources list starting with TPM and assign the first trust > > > > source as a backend which has initiazed successfully during > > > > iteration. > > > > > > > > Note that current implementation only supports a single trust > > > > source at runtime which is either selectable at compile time or > > > > during boot via aforementioned module parameter. > > > > > > You never actually tested this, did you? I'm now getting EINVAL > > > from all the trusted TPM key operations because of this patch. > > > > > > > Unfortunately, I don't possess a development machine with a TPM > > device. So mine testing was entirely based on TEE as a backend which > > doesn't support any optional parameters. And that being the reason I > > didn't catch this issue at first instance. > > > > Is there any TPM emulation environment available that I can use for > > testing? > > Well use the same as we all use: A software TPM running in the host > coupled with a virtual machine guest for the kernel: > > https://en.opensuse.org/Software_TPM_Emulator_For_QEMU > > It doesn't catch interface issues (like TIS timeouts) but it does catch > TPM operations problems like this patch had. > Thanks for the pointer. I will use it for future testing. -Sumit > James > >
