1What: /sys/kernel/livepatch 2Date: Nov 2014 3KernelVersion: 3.19.0 4Contact: live-patching@vger.kernel.org 5Description: 6 Interface for kernel live patching 7 8 The /sys/kernel/livepatch directory contains subdirectories for 9 each loaded live patch module. 10 11What: /sys/kernel/livepatch/<patch> 12Date: Nov 2014 13KernelVersion: 3.19.0 14Contact: live-patching@vger.kernel.org 15Description: 16 The patch directory contains subdirectories for each kernel 17 object (vmlinux or a module) in which it patched functions. 18 19What: /sys/kernel/livepatch/<patch>/enabled 20Date: Nov 2014 21KernelVersion: 3.19.0 22Contact: live-patching@vger.kernel.org 23Description: 24 A writable attribute that indicates whether the patched 25 code is currently applied. Writing 0 will disable the patch 26 while writing 1 will re-enable the patch. 27 28What: /sys/kernel/livepatch/<patch>/transition 29Date: Feb 2017 30KernelVersion: 4.12.0 31Contact: live-patching@vger.kernel.org 32Description: 33 An attribute which indicates whether the patch is currently in 34 transition. 35 36What: /sys/kernel/livepatch/<patch>/force 37Date: Nov 2017 38KernelVersion: 4.15.0 39Contact: live-patching@vger.kernel.org 40Description: 41 A writable attribute that allows administrator to affect the 42 course of an existing transition. Writing 1 clears 43 TIF_PATCH_PENDING flag of all tasks and thus forces the tasks to 44 the patched or unpatched state. Administrator should not 45 use this feature without a clearance from a patch 46 distributor. Removal (rmmod) of patch modules is permanently 47 disabled when the feature is used. See 48 Documentation/livepatch/livepatch.rst for more information. 49 50What: /sys/kernel/livepatch/<patch>/<object> 51Date: Nov 2014 52KernelVersion: 3.19.0 53Contact: live-patching@vger.kernel.org 54Description: 55 The object directory contains subdirectories for each function 56 that is patched within the object. 57 58What: /sys/kernel/livepatch/<patch>/<object>/<function,sympos> 59Date: Nov 2014 60KernelVersion: 3.19.0 61Contact: live-patching@vger.kernel.org 62Description: 63 The function directory contains attributes regarding the 64 properties and state of the patched function. 65 66 The directory name contains the patched function name and a 67 sympos number corresponding to the nth occurrence of the symbol 68 name in kallsyms for the patched object. 69 70 There are currently no such attributes. 71