linux-kernel - Re: [PATCH v3 00/10] livepatch,module: Remove .klp.arch and module_disable

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Message-ID: <alpine.LSU.2.21.2004271428530.24991@pobox.suse.cz>
Date:   Mon, 27 Apr 2020 14:32:22 +0200 (CEST)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Joe Lawrence <joe.lawrence@...hat.com>
cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Jessica Yu <jeyu@...nel.org>
Subject: Re: [PATCH v3 00/10] livepatch,module: Remove .klp.arch and
 module_disable_ro()

> BTW, this may be out of scope for this patchset, but is it a large amount of
> work to support clearing klp-relocations on target module unload?  ie, this
> test case:
> 
>   - (target module and livepatch loaded)
>   - rmmod target_mod
>   - modprobe target_mod       << fails as reloc target is non-zero
> 
> IIRC, Miroslav had taken a stab at this last year, but I don't remember what
> the technical problems were then.

Yes, see 
https://lore.kernel.org/live-patching/alpine.LSU.2.21.1910031110440.9011@pobox.suse.cz/

I think the "conclusion" there still applies... but yes, it makes testing 
difficult.

Miroslav