** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1771844
Title:
powerpc/livepatch: Implement reliable stack tracing for the
consistency model
Status in The Ubuntu-power-systems project:
In Progress
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Cosmic:
In Progress
Bug description:
== SRU Justification ==
Livepatch has a consistency model which is a hybrid of kGraft and kpatch:
it uses kGraft's per-task consistency and syscall barrier switching
combined with kpatch's stack trace switching. The current approach is
stack checking of sleeping tasks. If no affected functions are on the
stack of a given task, the task is patched. In most cases this will patch
most or all of the tasks on the first try. Otherwise, it'll keep trying
periodically. This patch implements the reliable stack tracing for
consistency model a.k.a HAVE_RELIABLE_STACKTRACE.
This will help in switching livepatching implementation to basic per-task
consistency model. It is the foundation, which will help us enable
security patches changing function or data semantics. This is the biggest
remaining piece needed on ppc64le to make livepatch more generally useful.
== Fix ==
df78d3f61480 ("powerpc/livepatch: Implement reliable stack tracing for the
consistency model")
== Regression Potential ==
Low. Limited to powerpc.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1771844/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
