** Changed in: gnutls28 (Ubuntu)
Status: In Progress => Fix Committed
** 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
+ Compile the program from https://gitlab.com/gnutls/gnutls/issues/204 and make
sure the cipher text is not all zeros when running it on an aarch64 machine w/
HW accel.
[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)
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https://bugs.launchpad.net/bugs/1707172
Title:
AES256-GCM emits all-zeros ciphertext on aarch64 with hardware
acceleration
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