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What: /sys/kernel/livepatch
Date: Nov 2014
KernelVersion: 3.19.0
Contact: live-patching@vger.kernel.org
Description:
Interface for kernel live patching
The /sys/kernel/livepatch directory contains subdirectories for
each loaded live patch module.
What: /sys/kernel/livepatch/<patch>
Date: Nov 2014
KernelVersion: 3.19.0
Contact: live-patching@vger.kernel.org
Description:
The patch directory contains subdirectories for each kernel
object (vmlinux or a module) in which it patched functions.
What: /sys/kernel/livepatch/<patch>/enabled
Date: Nov 2014
KernelVersion: 3.19.0
Contact: live-patching@vger.kernel.org
Description:
A writable attribute that indicates whether the patched
code is currently applied. Writing 0 will disable the patch
while writing 1 will re-enable the patch.
What: /sys/kernel/livepatch/<patch>/transition
Date: Feb 2017
KernelVersion: 4.12.0
Contact: live-patching@vger.kernel.org
Description:
An attribute which indicates whether the patch is currently in
transition.
What: /sys/kernel/livepatch/<patch>/signal
Date: Nov 2017
KernelVersion: 4.15.0
Contact: live-patching@vger.kernel.org
Description:
A writable attribute that allows administrator to affect the
course of an existing transition. Writing 1 sends a fake
signal to all remaining blocking tasks. The fake signal
means that no proper signal is delivered (there is no data in
signal pending structures). Tasks are interrupted or woken up,
and forced to change their patched state.
What: /sys/kernel/livepatch/<patch>/force
Date: Nov 2017
KernelVersion: 4.15.0
Contact: live-patching@vger.kernel.org
Description:
A writable attribute that allows administrator to affect the
course of an existing transition. Writing 1 clears
TIF_PATCH_PENDING flag of all tasks and thus forces the tasks to
the patched or unpatched state. Administrator should not
use this feature without a clearance from a patch
distributor. Removal (rmmod) of patch modules is permanently
disabled when the feature is used. See
Documentation/livepatch/livepatch.txt for more information.
What: /sys/kernel/livepatch/<patch>/<object>
Date: Nov 2014
KernelVersion: 3.19.0
Contact: live-patching@vger.kernel.org
Description:
The object directory contains subdirectories for each function
that is patched within the object.
What: /sys/kernel/livepatch/<patch>/<object>/<function,sympos>
Date: Nov 2014
KernelVersion: 3.19.0
Contact: live-patching@vger.kernel.org
Description:
The function directory contains attributes regarding the
properties and state of the patched function.
The directory name contains the patched function name and a
sympos number corresponding to the nth occurrence of the symbol
name in kallsyms for the patched object.
There are currently no such attributes.
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