1 What: /sys/kernel/livepatch 1 What: /sys/kernel/livepatch
2 Date: Nov 2014 2 Date: Nov 2014
3 KernelVersion: 3.19.0 3 KernelVersion: 3.19.0
4 Contact: live-patching@vger.kernel.org 4 Contact: live-patching@vger.kernel.org
5 Description: 5 Description:
6 Interface for kernel live patc 6 Interface for kernel live patching
7 7
8 The /sys/kernel/livepatch dire 8 The /sys/kernel/livepatch directory contains subdirectories for
9 each loaded live patch module. 9 each loaded live patch module.
10 10
11 What: /sys/kernel/livepatch/<patch> 11 What: /sys/kernel/livepatch/<patch>
12 Date: Nov 2014 12 Date: Nov 2014
13 KernelVersion: 3.19.0 13 KernelVersion: 3.19.0
14 Contact: live-patching@vger.kernel.org 14 Contact: live-patching@vger.kernel.org
15 Description: 15 Description:
16 The patch directory contains s 16 The patch directory contains subdirectories for each kernel
17 object (vmlinux or a module) i 17 object (vmlinux or a module) in which it patched functions.
18 18
19 What: /sys/kernel/livepatch/<patch>/ 19 What: /sys/kernel/livepatch/<patch>/enabled
20 Date: Nov 2014 20 Date: Nov 2014
21 KernelVersion: 3.19.0 21 KernelVersion: 3.19.0
22 Contact: live-patching@vger.kernel.org 22 Contact: live-patching@vger.kernel.org
23 Description: 23 Description:
24 A writable attribute that indi 24 A writable attribute that indicates whether the patched
25 code is currently applied. Wr 25 code is currently applied. Writing 0 will disable the patch
26 while writing 1 will re-enable 26 while writing 1 will re-enable the patch.
27 27
28 What: /sys/kernel/livepatch/<patch>/ 28 What: /sys/kernel/livepatch/<patch>/transition
29 Date: Feb 2017 29 Date: Feb 2017
30 KernelVersion: 4.12.0 30 KernelVersion: 4.12.0
31 Contact: live-patching@vger.kernel.org 31 Contact: live-patching@vger.kernel.org
32 Description: 32 Description:
33 An attribute which indicates w 33 An attribute which indicates whether the patch is currently in
34 transition. 34 transition.
35 35
>> 36 What: /sys/kernel/livepatch/<patch>/signal
>> 37 Date: Nov 2017
>> 38 KernelVersion: 4.15.0
>> 39 Contact: live-patching@vger.kernel.org
>> 40 Description:
>> 41 A writable attribute that allows administrator to affect the
>> 42 course of an existing transition. Writing 1 sends a fake
>> 43 signal to all remaining blocking tasks. The fake signal
>> 44 means that no proper signal is delivered (there is no data in
>> 45 signal pending structures). Tasks are interrupted or woken up,
>> 46 and forced to change their patched state.
>> 47
36 What: /sys/kernel/livepatch/<patch>/ 48 What: /sys/kernel/livepatch/<patch>/force
37 Date: Nov 2017 49 Date: Nov 2017
38 KernelVersion: 4.15.0 50 KernelVersion: 4.15.0
39 Contact: live-patching@vger.kernel.org 51 Contact: live-patching@vger.kernel.org
40 Description: 52 Description:
41 A writable attribute that allo 53 A writable attribute that allows administrator to affect the
42 course of an existing transiti 54 course of an existing transition. Writing 1 clears
43 TIF_PATCH_PENDING flag of all 55 TIF_PATCH_PENDING flag of all tasks and thus forces the tasks to
44 the patched or unpatched state 56 the patched or unpatched state. Administrator should not
45 use this feature without a cle 57 use this feature without a clearance from a patch
46 distributor. Removal (rmmod) o 58 distributor. Removal (rmmod) of patch modules is permanently
47 disabled when the feature is u 59 disabled when the feature is used. See
48 Documentation/livepatch/livepa !! 60 Documentation/livepatch/livepatch.txt for more information.
49 <<
50 What: /sys/kernel/livepatch/<patch>/ <<
51 Date: Jun 2024 <<
52 KernelVersion: 6.11.0 <<
53 Contact: live-patching@vger.kernel.org <<
54 Description: <<
55 An attribute which indicates w <<
56 atomic-replace. <<
57 61
58 What: /sys/kernel/livepatch/<patch>/ 62 What: /sys/kernel/livepatch/<patch>/<object>
59 Date: Nov 2014 63 Date: Nov 2014
60 KernelVersion: 3.19.0 64 KernelVersion: 3.19.0
61 Contact: live-patching@vger.kernel.org 65 Contact: live-patching@vger.kernel.org
62 Description: 66 Description:
63 The object directory contains 67 The object directory contains subdirectories for each function
64 that is patched within the obj 68 that is patched within the object.
65 <<
66 What: /sys/kernel/livepatch/<patch>/ <<
67 Date: August 2022 <<
68 KernelVersion: 6.1.0 <<
69 Contact: live-patching@vger.kernel.org <<
70 Description: <<
71 An attribute which indicates w <<
72 patched. <<
73 69
74 What: /sys/kernel/livepatch/<patch>/ 70 What: /sys/kernel/livepatch/<patch>/<object>/<function,sympos>
75 Date: Nov 2014 71 Date: Nov 2014
76 KernelVersion: 3.19.0 72 KernelVersion: 3.19.0
77 Contact: live-patching@vger.kernel.org 73 Contact: live-patching@vger.kernel.org
78 Description: 74 Description:
79 The function directory contain 75 The function directory contains attributes regarding the
80 properties and state of the pa 76 properties and state of the patched function.
81 77
82 The directory name contains th 78 The directory name contains the patched function name and a
83 sympos number corresponding to 79 sympos number corresponding to the nth occurrence of the symbol
84 name in kallsyms for the patch 80 name in kallsyms for the patched object.
85 81
86 There are currently no such at 82 There are currently no such attributes.
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