linux-kernel - Re: [PATCH 07/11 v2] livepatch: Trigger WARNING if livepatch function fails due to recursion

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Message-ID: <20201102144109.GI20201@alley>
Date:   Mon, 2 Nov 2020 15:41:09 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        live-patching@...r.kernel.org
Subject: Re: [PATCH 07/11 v2] livepatch: Trigger WARNING if livepatch
 function fails due to recursion

On Fri 2020-10-30 17:31:49, Steven Rostedt wrote:
> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
> 
> If for some reason a function is called that triggers the recursion
> detection of live patching, trigger a warning. By not executing the live
> patch code, it is possible that the old unpatched function will be called
> placing the system into an unknown state.
> 
> Link: https://lore.kernel.org/r/20201029145709.GD16774@alley
> 
> Cc: Josh Poimboeuf <jpoimboe@...hat.com>
> Cc: Jiri Kosina <jikos@...nel.org>
> Cc: Miroslav Benes <mbenes@...e.cz>
> Cc: Joe Lawrence <joe.lawrence@...hat.com>
> Cc: live-patching@...r.kernel.org
> Suggested-by: Petr Mladek <pmladek@...e.com>

It has actually been first suggested by Miroslav. He might want
to take the fame and eventual shame ;-)

> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr