Re: [PATCHv3 0/3] Kernel Live Patching

From: Masami Hiramatsu
Date: Thu Nov 20 2014 - 21:44:58 EST

Hi Seth,

(2014/11/21 7:29), Seth Jennings wrote:
> Summary:
> This patchset implements an ftrace-based mechanism and kernel interface for
> doing live patching of kernel and kernel module functions. It represents the
> greatest common functionality set between kpatch [1] and kGraft [2] and can
> accept patches built using either method. This solution was discussed in the
> Live Patching Mini-conference at LPC 2014 [3].
> The model consists of a live patching "core" that provides an interface for
> other "patch" kernel modules to register patches with the core.
> Patch modules contain the new function code and create an klp_patch structure
> containing the required data about what functions to patch, where the new code
> for each patched function resides, and in which kernel object (vmlinux or
> module) the function to be patch resides. The patch module then invokes the
> klp_register_patch() function to register with the core, then klp_enable_patch()
> to have the core redirect the execution paths using ftrace.
> An example patch module can be found here:

Hmm, I think we should import this example under samples/livepatch/ or
tools/testing/selftests/livepatch/ for self testing, so that others
can easily see what will happen. :)

Thank you,

Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory

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