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