tree b5492d96321c40a9dd066646d09e26ffd9a945ef
parent 768f69c3720c9de7bd66a8debc76628bd63d1ae9
author David Brazdil <dbrazdil@google.com> 1576771446 +0000
committer David Brazdil <dbrazdil@google.com> 1576835590 +0000

Emit speculation barriers after ERETs

According to Linux commit 679db70801da9fda91d26caf13bf5b5ccc74e8e8
some ARM64 CPUs may speculate past an ERET. This could be used as part
of a side-channel attack.

To mitigate the issue, emit DSB/ISB barriers after every ERET.

Add a build step which dumps the generated ELF and check that this holds
for every ERET in the binary to prevent regressing.

Bug: 146490856
Change-Id: Idf1c2690637a7edb4a366d30fec26ed444069f5e