TF-M March 2019

tf-m@lists.trustedfirmware.org

17 participants
45 discussions

Re: [TF-M] Trusted boot - rollback protection

by David Brown

On Mon, Mar 11, 2019 at 01:43:19PM +0000, Tamas Ban via TF-M wrote: >https://developer.trustedfirmware.org/w/tf_m/design/trusted_boot/rollback_p… Oh, and a little terminology comment about the Trusted non-volatile (NV) counters. This section should use "increase" and "decrease" not "increment" and "decrement". There is no requirement that the counter only be incremented (having 1 added to the value), only that it be set to a larger value than the current value. You should probably also add a discussion as to how testing will be done with a HW security counter. Again, my suggestion is to not add an additional counter, but just use the existing version field (minus the build number) as the security counter value. David

5 years, 1 month

Trusted boot - rollback protection

by Tamas Ban

Hi all, Please see the following link for a design proposal on anti-rollback protection in trusted boot: https://developer.trustedfirmware.org/w/tf_m/design/trusted_boot/rollback_p… Comments are welcome! Regards Tamas Ban

5 years, 1 month

Re: [TF-M] multiple services within the same SP

by Andrew Thoelke

Hi Alan, I can answer this from the PSA Firmware Framework specification point of view, Ken (or others in the TF-M team) can clarify how closely the TF-M behaviour matches this. In the manifest each service has a "signal" attribute which is a C identifier that is given the signal value for that service. The value is allocated by the TF-M tools and should be available to the SP source code via a generated header file - the specification places these definitions in the psa_manifest/<manifestfilename>.h header file, matching the name of the manifest file itself. When the SP receives a set of signals from psa_wait(), it can identify which signals are asserted using these identifiers to test the signal bits. The example RoT Service in Appendix D of the PSA Firmware Framework demonstrates this. Regards, Andrew -----Original Message----- From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of DeMars, Alan via TF-M Sent: 08 March 2019 13:52 To: tf-m(a)lists.trustedfirmware.org Subject: [TF-M] multiple services within the same SP In a multi-service SP, how does the SP know which SID has been used to connect to it? -- TF-M mailing list TF-M(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-m IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

5 years, 1 month

Re: [TF-M] multiple services within the same SP

by Ken Liu (Arm Technology China)

Hi Alan, Services are listed in SP. SPM could enumerate the services in a SP by the list. You can check the member variable ' service_list' of ' tfm_spm_ipc_partition_t' to know details. -Ken > -----Original Message----- > From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of DeMars, > Alan via TF-M > Sent: Friday, March 8, 2019 9:52 PM > To: tf-m(a)lists.trustedfirmware.org > Subject: [TF-M] multiple services within the same SP > > In a multi-service SP, how does the SP know which SID has been used to connect > to it? > -- > TF-M mailing list > TF-M(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-m IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

5 years, 1 month

multiple services within the same SP

by DeMars, Alan

In a multi-service SP, how does the SP know which SID has been used to connect to it?

5 years, 1 month

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TF-M March 2019