linux-kernel - Re: [PATCH 15/20] ALSA: usb-audio: Manual replacement of the deprecated strlcpy() with return values

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Message-ID: <s5hwnv0w1qi.wl-tiwai@suse.de>
Date:   Mon, 22 Feb 2021 16:39:33 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Romain Perier <romain.perier@...il.com>
Cc:     Kees Cook <keescook@...omium.org>,
        kernel-hardening@...ts.openwall.com,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 15/20] ALSA: usb-audio: Manual replacement of the deprecated strlcpy() with return values

On Mon, 22 Feb 2021 16:12:26 +0100,
Romain Perier wrote:
> 
> The strlcpy() reads the entire source buffer first, it is dangerous if
> the source buffer lenght is unbounded or possibility non NULL-terminated.
> It can lead to linear read overflows, crashes, etc...
> 
> As recommended in the deprecated interfaces [1], it should be replaced
> by strscpy.
> 
> This commit replaces all calls to strlcpy that handle the return values
> by the corresponding strscpy calls with new handling of the return
> values (as it is quite different between the two functions).
> 
> [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
> 
> Signed-off-by: Romain Perier <romain.perier@...il.com>

The strlcpy() usage in sound/* have been already converted on the
latest Linus tree.  So please drop this one.


thanks,

Takashi