APPLIED: [SRU][Bionic][Cosmic][PATCH 0/1] powerpc/livepatch: Implement reliable stack tracing for the consistency model

[Khaled Elmously]

Applied to Bionic


On 2018-05-23 13:16:25 , Joseph Salisbury wrote:
> BugLink: http://bugs.launchpad.net/bugs/1771844
> 
> == 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.
> 
> 
> Torsten Duwe (1):
>   powerpc/livepatch: Implement reliable stack tracing for the
>     consistency model
> 
>  arch/powerpc/Kconfig             |   1 +
>  arch/powerpc/kernel/stacktrace.c | 119 ++++++++++++++++++++++++++++++-
>  2 files changed, 119 insertions(+), 1 deletion(-)
> 
> -- 
> 2.17.0
> 
> 
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