Public bug reported:
SRU Justification
[Impact]
MSFT has requested the inclusion of commit
e8dfdf3162eb549d064b8c10b1564f7e8ee82591 ('arm64: efi: Recover from
synchronous exceptions occurring in firmware'). It looks generic enough
to apply to the master kernel.
Unlike x86, which has machinery to deal with page faults that occur
during the execution of EFI runtime services, arm64 has nothing like
that, and a synchronous exception raised by firmware code brings down
the whole system.
[Test Plan]
This looks like a hard one to reproduce. Boot and regression testing
should be sufficient.
[Regression Potential]
Firmware exceptions could still take down the system.
[Other Info]
SF: #00362062
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Fix Released
** Affects: linux (Ubuntu Jammy)
Importance: Medium
Assignee: Tim Gardner (timg-tpi)
Status: In Progress
** Affects: linux (Ubuntu Kinetic)
Importance: Medium
Assignee: Tim Gardner (timg-tpi)
Status: In Progress
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Kinetic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Fix Released
** Changed in: linux (Ubuntu Jammy)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Jammy)
Status: New => In Progress
** Changed in: linux (Ubuntu Kinetic)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Kinetic)
Status: New => In Progress
** Changed in: linux (Ubuntu Jammy)
Assignee: (unassigned) => Tim Gardner (timg-tpi)
** Changed in: linux (Ubuntu Kinetic)
Assignee: (unassigned) => Tim Gardner (timg-tpi)
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https://bugs.launchpad.net/bugs/2023311
Title:
Resolve synchronous exception on arm64
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Jammy:
In Progress
Status in linux source package in Kinetic:
In Progress
Bug description:
SRU Justification
[Impact]
MSFT has requested the inclusion of commit
e8dfdf3162eb549d064b8c10b1564f7e8ee82591 ('arm64: efi: Recover from
synchronous exceptions occurring in firmware'). It looks generic
enough to apply to the master kernel.
Unlike x86, which has machinery to deal with page faults that occur
during the execution of EFI runtime services, arm64 has nothing like
that, and a synchronous exception raised by firmware code brings down
the whole system.
[Test Plan]
This looks like a hard one to reproduce. Boot and regression testing
should be sufficient.
[Regression Potential]
Firmware exceptions could still take down the system.
[Other Info]
SF: #00362062
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2023311/+subscriptions
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