Public bug reported: == Comment: #0 - Kamalesh Babulal - 2018-05-15 09:37:52 == 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. https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac ** Affects: ubuntu-power-systems Importance: High Assignee: Canonical Kernel Team (canonical-kernel-team) Status: Triaged ** Affects: linux (Ubuntu) Importance: Undecided Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) Status: New ** Tags: architecture-ppc64le bugnameltc-167879 severity-critical targetmilestone-inin1804 triage-g ** Tags added: architecture-ppc64le bugnameltc-167879 severity-critical targetmilestone-inin1804 ** Changed in: ubuntu Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) ** Package changed: ubuntu => linux (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1771844 Title: powerpc/livepatch: Implement reliable stack tracing for the consistency model To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1771844/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
