** Description changed:
[Impact]
In bug 1756096, we backported SDEI (Software Delegated Exception Interface)
support for arm64. However, this backport missed 2 changes that make the SDEI
entry point a trampoline which make sure the kernel is mapped before
processing. (The kernel may not be
This bug was fixed in the package linux - 4.15.0-23.25
---
linux (4.15.0-23.25) bionic; urgency=medium
* linux: 4.15.0-23.25 -proposed tracker (LP: #1772927)
* arm64 SDEI support needs trampoline code for KPTI (LP: #1768630)
- arm64: mmu: add the entry trampolines start/end s
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1768630
Title:
arm64 SDEI support needs trampoline code fo
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag 'verifica
I've smoke-tested the proposed kernel on a system that uses kpti by
default:
ubuntu@awrep3:~$ dmesg | grep -i kpti
[0.074874] CPU features: detected feature: Kernel page table isolation
(KPTI)
ubuntu@awrep3:~$ cat /proc/version
Linux version 4.15.0-23-generic (buildd@bos02-arm64-002) (gcc ver
This bug was fixed in the package linux - 4.15.0-23.25
---
linux (4.15.0-23.25) bionic; urgency=medium
* linux: 4.15.0-23.25 -proposed tracker (LP: #1772927)
* arm64 SDEI support needs trampoline code for KPTI (LP: #1768630)
- arm64: mmu: add the entry trampolines start/end s
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