linux-kernel - Re: [RFC 00/31] objtool, livepatch: Livepatch module generation

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Message-ID: <20240911073942.fem2kekg3f23hzf2@treble>
Date: Wed, 11 Sep 2024 00:39:42 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: live-patching@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, x86@...nel.org,
	Miroslav Benes <mbenes@...e.cz>, Petr Mladek <pmladek@...e.com>,
	Joe Lawrence <joe.lawrence@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Marcos Paulo de Souza <mpdesouza@...e.com>,
	Song Liu <song@...nel.org>
Subject: Re: [RFC 00/31] objtool, livepatch: Livepatch module generation

On Mon, Sep 02, 2024 at 08:59:43PM -0700, Josh Poimboeuf wrote:
> Hi,
> 
> Here's a new way to build livepatch modules called klp-build.
> 
> I started working on it when I realized that objtool already does 99% of
> the work needed for detecting function changes.
> 
> This is similar in concept to kpatch-build, but the implementation is
> much cleaner.
> 
> Personally I still have reservations about the "source-based" approach
> (klp-convert and friends), including the fragility and performance
> concerns of -flive-patching.  I would submit that klp-build might be
> considered the "official" way to make livepatch modules.
> 
> Please try it out and let me know what you think.  Based on v6.10.
> 
> Also avaiable at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/jpoimboe/linux.git klp-build-rfc

Here's an updated branch with a bunch of fixes.  It's still incompatible
with BTF at the moment, otherwise it should (hopefully) fix the rest of
the issues reported so far.

While the known bugs are fixed, I haven't finished processing all the
review comments yet.  Once that happens I'll post a proper v2.

  git://git.kernel.org/pub/scm/linux/kernel/git/jpoimboe/linux.git klp-build-v1.5

-- 
Josh