linux-kernel - Re: [PATCH] livepatch: Cancel transition a safe way for immediate patches

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Message-ID: <alpine.LSU.2.20.1704112054580.28004@cbobk.fhfr.pm>
Date:   Tue, 11 Apr 2017 20:55:35 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Petr Mladek <pmladek@...e.com>
cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>, Jessica Yu <jeyu@...hat.com>,
        linux-kernel@...r.kernel.org, live-patching@...r.kernel.org
Subject: Re: [PATCH] livepatch: Cancel transition a safe way for immediate
 patches

On Tue, 11 Apr 2017, Petr Mladek wrote:

> klp_init_transition() does not set func->transition for immediate patches.
> Then klp_ftrace_handler() could use the new code immediately. As a result,
> it is not safe to put the livepatch module in klp_cancel_transition().
> 
> This patch reverts most of the last minute changes klp_cancel_transition().
> It keeps the warning about a misuse because it still makes sense.
> 
> Signed-off-by: Petr Mladek <pmladek@...e.com>
> ---
> Hi,
> 
> I am afraid that Mirek was not right in the mail
> https://lkml.kernel.org/r/alpine.LSU.2.20.1702161504020.16310@pobox.suse.cz
> IMHO, it is not safe to put the module when the immediate
> patch cannot be applied.

That's a very good catch indeed, thanks. Applied.

-- 
Jiri Kosina
SUSE Labs