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Message-ID: <20171027111527.GD1305@nazgul.tnic>
Date:   Fri, 27 Oct 2017 13:15:27 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Zhou Chengming <zhouchengming1@...wei.com>
Cc:     mhiramat@...nel.org, ananth@...ux.vnet.ibm.com,
        anil.s.keshavamurthy@...el.com, davem@...emloft.net, hpa@...or.com,
        tglx@...utronix.de, peterz@...radead.org, jkosina@...e.cz,
        rostedt@...dmis.org, mjurczyk@...gle.com, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kprobes, x86/alternatives: use text_mutex to protect
 smp_alt_modules

On Fri, Oct 27, 2017 at 05:34:44PM +0800, Zhou Chengming wrote:
> Fixes: 2cfa197 "ftrace/alternatives: Introducing *_text_reserved
> functions"
> 
> We use alternatives_text_reserved() to check if the address is in
> the fixed pieces of alternative reserved, but the problem is that
> we don't hold the smp_alt mutex when call this function. So the list
> traversal may encounter a deleted list_head if another path is doing
> alternatives_smp_module_del().

Is this something you've triggered on a real machine or is this just
from code staring?

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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