红帽全球峰会8.3. Access to kernel live patches
A kernel module (kmod) implements kernel live patching capability and is provided as an RPM package.
You are provided an access to kernel live patches, which are delivered through the standard channels. However, if you are not subscribed to an extended support offering, you lose access to new patches for the current minor release when the next minor release becomes available. For example, in the standard subscriptions, you are able to live patch RHEL 10.1 kernel until the RHEL 10.2 kernel is released. After the release of RHEL 10.2, live patches for RHEL 10.1 are not available.
The components of kernel live patching are as follows:
- Kernel patch module
- The delivery mechanism for kernel live patches.
- A kernel module built specifically for the kernel being patched.
- The patch module contains the code of the required fixes for the kernel.
-
Patch modules register with the
livepatchkernel subsystem and specify the original functions to replace, along with pointers to the replacement functions. Kernel patch modules are delivered as RPMs. -
The naming convention is
kpatch_<kernel version>_<kpatch version>_<kpatch release>. The "kernel version" part of the name has dots replaced with underscores.
- The
kpatchutility - A command-line utility for managing patch modules.
- The
kpatchservice -
A
systemdservice required bymultiuser.target. This target loads the kernel patch module at boot time. - The
kpatch-dnfpackage - A DNF plugin delivered in the form of an RPM package. This plugin manages automatic subscription to kernel live patches.
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