TF-A January 2023

tf-a@lists.trustedfirmware.org

15 participants
16 discussions

by Jens Wiklander

Hi, The recent patch [1] for the OP-TEE Dispatcher in TF-A proposes a way of post-boot loading OP-TEE by the Linux kernel with signature verification in the normal world only. This has previously been discussed in this mail thread [2] about half a year ago. Ultimately, it was concluded that this should in principle be accepted upstream as a platform choice to allow this or not. There are concerns that what we have in upstream TF-A should serve as good examples, and trusting the normal world to verify secure world software might not meet that criterion. There are also concerns about adding signature verification to BL31 Leaving the secure world wide open until the Linux kernel has been able to successfully load and verify an OP-TEE binary seems very risky. Even if it's claimed that the normal world can be trusted at this point, we're still giving up a critical level of defense without a good reason. I've started to review [1], but it should not be accepted for merging without support and approval from other maintainers. I would like to explore other options in this mail thread. In [2] it was suggested that a remnant of bl2 could be kept to verify OP-TEE before starting to execute it. This could be taken one step further and load a limited OP-TEE at boot which later is updated live, almost like what's discussed in [3]. This should minimize the impact on TF-A and also leave OP-TEE in charge of accepting an update instead of a divided responsibility between the normal world and TF-A. [1] https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/18635 [2] https://lists.trustedfirmware.org/archives/list/tf-a@lists.trustedfirmware.… [3] https://github.com/OP-TEE/optee_os/issues/5699 Thanks, Jens

1 year, 10 months

New vulnerability: Out-of-bounds read in TF-A X.509 parser

by Sandrine Bailleux

Hello everyone, A new security vulnerability has been identified in TF-A X.509 parser, used for trusted boot in BL1 and BL2. Please note that this vulnerability is *not* exploitable in TF-A upstream code. Only downstream code might be affected under specific circumstances. The security advisory has been published in TF-A documentation and has all the details: https://trustedfirmware-a.readthedocs.io/en/latest/security_advisories/secu… Patches to fix the identified bugs have already been merged in TF-A tree. The advisory lists the relevant patches. I would like to thank Demi Marie Obenour from Invisible Things Lab for responsibly disclosing this security vulnerability to TrustedFirmware.org, for providing patches to fix the identified bugs and further harden the X.509 parser, for providing a detailed impact analysis and for helping put this security advisory together. Best regards, Sandrine Bailleux, on behalf of TF-A security team.

1 year, 10 months

Updated invitation with note: TF-A Tech Forum @ Thu Jan 26, 2023 4pm - 5pm (GMT) (tf-a@lists.trustedfirmware.org)

by joanna.farley＠arm.com

This event has been updated with a note: "Correcting the deletion of the wrong Techforum." Changed: time TF-A Tech Forum Thursday Jan 26, 2023 ⋅ 4pm – 5pm United Kingdom Time We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/Tr… Firmware is inviting you to a scheduled Zoom meeting.Join Zoom Meetinghttps://zoom.us/j/9159704974Meeting ID: 915 970 4974One tap mobile+16465588656,,9159704974# US (New York)+16699009128,,9159704974# US (San Jose)Dial by your location        +1 646 558 8656 US (New York)        +1 669 900 9128 US (San Jose)        877 853 5247 US Toll-free        888 788 0099 US Toll-freeMeeting ID: 915 970 4974Find your local number: https://zoom.us/u/ad27hc6t7h   Guests marek.bykowski(a)gmail.com okash.khawaja(a)gmail.com tf-a(a)lists.trustedfirmware.org View all guest info https://calendar.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1… Reply for tf-a(a)lists.trustedfirmware.org and view more details https://calendar.google.com/calendar/event?action=VIEW&eid=NWlub3Ewdm1tMmk1… Your attendance is optional. ~~//~~ Invitation from Google Calendar: https://calendar.google.com/calendar/ You are receiving this email because you are an attendee on the event. To stop receiving future updates for this event, decline this event. Forwarding this invitation could allow any recipient to send a response to the organizer, be added to the guest list, invite others regardless of their own invitation status, or modify your RSVP. Learn more https://support.google.com/calendar/answer/37135#forwarding

1 year, 10 months

Canceled event with note: TF-A Tech Forum @ Thu Jan 26, 2023 4pm - 5pm (GMT) (tf-a@lists.trustedfirmware.org)

by joanna.farley＠arm.com

This event has been canceled with a note: "No topic this week. Cancelling. Joanna" TF-A Tech Forum Thursday Jan 26, 2023 ⋅ 4pm – 5pm United Kingdom Time We run an open technical forum call for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC. Feel free to forward this invite to colleagues. Invites are via the TF-A mailing list and also published on the Trusted Firmware website. Details are here: https://www.trustedfirmware.org/meetings/tf-a-technical-forum/Tr… Firmware is inviting you to a scheduled Zoom meeting.Join Zoom Meetinghttps://zoom.us/j/9159704974Meeting ID: 915 970 4974One tap mobile+16465588656,,9159704974# US (New York)+16699009128,,9159704974# US (San Jose)Dial by your location        +1 646 558 8656 US (New York)        +1 669 900 9128 US (San Jose)        877 853 5247 US Toll-free        888 788 0099 US Toll-freeMeeting ID: 915 970 4974Find your local number: https://zoom.us/u/ad27hc6t7h   Guests marek.bykowski(a)gmail.com okash.khawaja(a)gmail.com tf-a(a)lists.trustedfirmware.org ~~//~~ Invitation from Google Calendar: https://calendar.google.com/calendar/ You are receiving this email because you are an attendee on the event. To stop receiving future updates for this event, decline this event. Forwarding this invitation could allow any recipient to send a response to the organizer, be added to the guest list, invite others regardless of their own invitation status, or modify your RSVP. Learn more https://support.google.com/calendar/answer/37135#forwarding

1 year, 10 months

TF-A Tech Forum Sessions Jan/Feb

by Joanna Farley

Hi all, With the start of the new year I’m looking to see what TF-A Techforums should cover over the next few sessions. As folks may know these are held every two weeks on a Thursday at 4pm GMT. If you need an invite do reach out to me. If folks have anything they would like to present to the TF-A community please do reach out to me as we often need topics. If we don’t have anything to present on upcoming sessions I will cancel the sessions the day before they are due to be held. Currently I tentatively have the following for the first 4 sessions which will be confirmed nearer the dates: * 12th January – No topic * 26th January – LTS Update * 9th February – No topic * 23rd February - Tech talk for PSCI OS-initiated mode Thanks Joanna

1 year, 10 months

Runtime loading of SEL-1

by Jeffrey Kardatzke

Hello, I'm working on a project for ChromeOS where we would like to be able to load the BL32 payload (OpTee) for SEL-1 after the linux kernel has booted rather than during the usual BL32 stage. We would do this via an SMC we would add which would take the OpTee image from linux and then have EL3 load it and perform the init for SEL-1 at that time. The reasoning behind this is that it's much easier to update the rootfs than the FW on our devices, and we can still ensure the integrity of the OpTee image if we load it early enough after the kernel boots. The main questions I have are if there are any issues people would be aware of by loading it after linux boots rather than during the usual BL32 stage? And I would definitely want to upstream this work if it's something we can do. Thanks, Jeffrey Kardatzke Google, Inc.

1 year, 10 months

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TF-A January 2023