linux-kernel - Re: [PATCH 2/2] module: Show the last unloaded module's taint flag(s)

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Message-ID: <20220628074708.fg3ocx3vu7affkxl@ava.usersys.com>
Date:   Tue, 28 Jun 2022 08:47:08 +0100
From:   Aaron Tomlin <atomlin@...hat.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     "mcgrof@...nel.org" <mcgrof@...nel.org>,
        "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] module: Show the last unloaded module's taint flag(s)

On Tue 2022-06-28 05:54 +0000, Christophe Leroy wrote:
> > -	/* Store the name of the last unloaded module for diagnostic purposes */
> >   	strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
> > +	strcat(last_unloaded_module, module_flags(mod, buf, false));
> 
> You replace a bounded string copy by an unbounded strict contat.
> 
> Should you use strlcat() instead ?

Hi Christophe,

Why? If I understand correctly, both the destination and source string are
NULL-terminated (see module_flags()). So, strcat() should be sufficient.


Kind regards,

-- 
Aaron Tomlin