Public bug reported:
[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 mapped if KPTI is enabled and the exception
comes in while e.g. executing in usermode).
[Test Case]
I haven't yet found a way to inject/simulate an SDEI, so I can only regression
test by boot testing.
[Regression Risk]
The code is restricted to arm64, and should only run on systems that support
SDEI.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Affects: linux (Ubuntu Bionic)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => dann frazier (dannf)
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https://bugs.launchpad.net/bugs/1768630
Title:
arm64 SDEI support needs trampoline code for KPTI
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
In Progress
Bug description:
[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 mapped if KPTI is enabled and the exception
comes in while e.g. executing in usermode).
[Test Case]
I haven't yet found a way to inject/simulate an SDEI, so I can only
regression test by boot testing.
[Regression Risk]
The code is restricted to arm64, and should only run on systems that support
SDEI.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1768630/+subscriptions
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