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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>/replace
51Date: Jun 2024
52KernelVersion: 6.11.0
53Contact: live-patching@vger.kernel.org
54Description:
55 An attribute which indicates whether the patch supports
56 atomic-replace.
57
58What: /sys/kernel/livepatch/<patch>/stack_order
59Date: Jan 2025
60KernelVersion: 6.14.0
61Description:
62 This attribute specifies the sequence in which live patch modules
63 are applied to the system. If multiple live patches modify the same
64 function, the implementation with the biggest 'stack_order' number
65 is used, unless a transition is currently in progress.
66
67What: /sys/kernel/livepatch/<patch>/<object>
68Date: Nov 2014
69KernelVersion: 3.19.0
70Contact: live-patching@vger.kernel.org
71Description:
72 The object directory contains subdirectories for each function
73 that is patched within the object.
74
75What: /sys/kernel/livepatch/<patch>/<object>/patched
76Date: August 2022
77KernelVersion: 6.1.0
78Contact: live-patching@vger.kernel.org
79Description:
80 An attribute which indicates whether the object is currently
81 patched.
82
83What: /sys/kernel/livepatch/<patch>/<object>/<function,sympos>
84Date: Nov 2014
85KernelVersion: 3.19.0
86Contact: live-patching@vger.kernel.org
87Description:
88 The function directory contains attributes regarding the
89 properties and state of the patched function.
90
91 The directory name contains the patched function name and a
92 sympos number corresponding to the nth occurrence of the symbol
93 name in kallsyms for the patched object.
94
95 There are currently no such attributes.