** Also affects: ubuntu-power-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-power-systems
Status: New => Triaged
** Tags added: triage-g
** Changed in: ubuntu-power-systems
Importance: Undecided => High
** Changed in: ubuntu-power-systems
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
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https://bugs.launchpad.net/bugs/1771844
Title:
powerpc/livepatch: Implement reliable stack tracing for the
consistency model
Status in The Ubuntu-power-systems project:
Triaged
Status in linux package in Ubuntu:
New
Bug description:
== 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
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