Ah, https://gitlab.com/gnutls/gnutls/issues/204 has more details.
** Description changed: + [Impact] + AES256-GCM ciphertext is all zero on arm64 with hardware acceleration, breaking gnome-terminal and xfce4-terminal which use encrypted scrollback buffers. + + [Test case] + Compile the program from https://gitlab.com/gnutls/gnutls/issues/204 and make sure the cipher text is not all zeros + + [Regression potential] + Code change is limited to AES256-GCM w/ HW accel on aarch64, so that's the only thing that could possibly break. But given that it's broken already, it does not seem to be a big issue even if it breaks otherwise. + + [Other info] + Original report: + The following Debian issue exists in the Ubuntu package as well https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=867581 It breaks gnome-terminal and xfce4-terminal on arm64 machines. The issue is fixed upstream in 3.5.13, and the fix was backported to Debian stretch as well (3.5.8-5+deb9u2) ** Changed in: gnutls28 (Ubuntu) Status: New => Triaged ** Changed in: gnutls28 (Ubuntu) Importance: Undecided => High ** Changed in: gnutls28 (Ubuntu) Status: Triaged => In Progress ** Changed in: gnutls28 (Ubuntu) Assignee: (unassigned) => Julian Andres Klode (juliank) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1707172 Title: AES256-GCM emits all-zeros ciphertext on aarch64 with hardware acceleration To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnutls28/+bug/1707172/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
