| 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. |