linux-kernel - Re: [PATCH 1/3] livepatch: Nullify obj->mod in klp_module

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Message-ID: <20180611090331.deciyqbbql3h2e3o@pathway.suse.cz>
Date:   Mon, 11 Jun 2018 11:03:31 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Miroslav Benes <mbenes@...e.cz>
Cc:     jikos@...nel.org, jpoimboe@...hat.com, jeyu@...nel.org,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] livepatch: Nullify obj->mod in klp_module_coming()'s
 error path

On Thu 2018-06-07 11:29:47, Miroslav Benes wrote:
> klp_module_coming() is called for every module appearing in the system.
> It sets obj->mod to a patched module for klp_object obj. Unfortunately
> it leaves it set even if an error happens later in the function and the
> patched module is not allowed to be loaded.
> 
> klp_is_object_loaded() uses obj->mod variable and could currently give a
> wrong return value. The bug is probably harmless as of now, but we're
> gonna rely on klp_is_object_loaded() and correct obj->mod much more and
> the bug would be visible then.
> 
> Signed-off-by: Miroslav Benes <mbenes@...e.cz>

Great catch!

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

Best Regards,
Petr