Re: [PATCH 2/3] livepatch: Allow user to specify functions to search for on a stack

On Fri, Nov 19, 2021 at 10:03:26AM +0100, Miroslav Benes wrote:

livepatch's consistency model requires that no live patched function
must be found on any task's stack during a transition process after a
live patch is applied. It is achieved by walking through stacks of all
blocked tasks.

The user might also want to define more functions to search for without
them being patched at all. It may either help with preparing a live
patch, which would otherwise require additional touches to achieve the
consistency, or it can be used to overcome deficiencies the stack
checking inherently has. For example, GCC may optimize a function so
that a part of it is moved to a different section and the function would
jump to it. This child function would not be found on a stack in this
case, but it may be important to search for it so that, again, the
consistency is achieved.

Allow the user to specify such functions on klp_object level.

Ok, so this relies on the patch generator to DTRT but then it should
work.

Thanks!