https://wiki.alpinelinux.org/w/index.php?action=history&feed=atom&title=Kernel_live_patching
Kernel live patching - Revision history
2026-05-05T22:21:12Z
Revision history for this page on the wiki
MediaWiki 1.40.0
https://wiki.alpinelinux.org/w/index.php?title=Kernel_live_patching&diff=24439&oldid=prev
Sertonix: + Category:Kernel
2023-08-25T01:21:18Z
<p>+ <a href="/wiki/Category:Kernel" title="Category:Kernel">Category:Kernel</a></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 01:21, 25 August 2023</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># Check that the patch has been loaded: <code>grep -i chunk /proc/meminfo</code></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># Check that the patch has been loaded: <code>grep -i chunk /proc/meminfo</code></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># Disable the patch: <code>doas kpatch unload kpatch-some.ko</code></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># Disable the patch: <code>doas kpatch unload kpatch-some.ko</code></div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category:Kernel]]</ins></div></td></tr>
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Sertonix
https://wiki.alpinelinux.org/w/index.php?title=Kernel_live_patching&diff=22186&oldid=prev
Androw: Created page with "Kernel Live Patching (KLP) enables the capacity to apply patch to the kernel without rebooting the system. To use KLP, you should follow the following steps: * Run a livepatc..."
2022-08-06T12:33:43Z
<p>Created page with "Kernel Live Patching (KLP) enables the capacity to apply patch to the kernel without rebooting the system. To use KLP, you should follow the following steps: * Run a livepatc..."</p>
<p><b>New page</b></p><div>Kernel Live Patching (KLP) enables the capacity to apply patch to the kernel without rebooting the system.<br />
<br />
To use KLP, you should follow the following steps:<br />
* Run a livepatching enabled kernel<br />
* Obtain the source tree of the kernel<br />
* Prepare and build the patch<br />
* Apply the patch<br />
<br />
You can use Kernel Live Patching in Alpine Linux by running a modified kernel.<br />
<br />
= Building the kernel =<br />
<br />
# Obtain the source<br />
# Enable the following flag CONFIG_LIVEPATCH and CONFIG_DEBUG_INFO<br />
# Build the kernel: <code>make</code><br />
# Install: <code>doas make modules_install && doas make install</code><br />
# Rebuild initramfs<br />
# Update bootloader<br />
# Reboot: <code>doas reboot</code><br />
<br />
= Patching the kernel =<br />
<br />
# Install kpatch: <code>doas apk add kpatch</code><br />
# Prepare the patch. You can create a file some.patch containing something around the following (it can need update depending on the kernel version):<br />
<br />
Index: src/fs/proc/meminfo.c<br />
===================================================================<br />
--- src.orig/fs/proc/meminfo.c<br />
+++ src/fs/proc/meminfo.c<br />
@@ -95,7 +95,7 @@ static int meminfo_proc_show(struct seq_<br />
"Committed_AS: %8lu kB\n"<br />
"VmallocTotal: %8lu kB\n"<br />
"VmallocUsed: %8lu kB\n"<br />
- "VmallocChunk: %8lu kB\n"<br />
+ "VMALLOCCHUNK: %8lu kB\n"<br />
#ifdef CONFIG_MEMORY_FAILURE<br />
"HardwareCorrupted: %5lu kB\n"<br />
#endif<br />
<br />
# Build the patch: <code>kpatch-build -s /path/to/kernel/source some.patch</code><br />
<br />
= Enabling the patch =<br />
<br />
# Enable the patch: <code>doas insmod kpatch-some.ko</code> or <code>doas kpatch load kpatch-some.ko</code><br />
# Check that the patch has been loaded: <code>grep -i chunk /proc/meminfo</code><br />
# Disable the patch: <code>doas kpatch unload kpatch-some.ko</code></div>
Androw