linux-hardening - Re: [PATCH] drivers/input: Remove all strcpy() uses in favor of strscpy()

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Date:   Sat, 7 Aug 2021 16:10:09 +0200
From:   Len Baker <len.baker@....com>
To:     Joe Perches <joe@...ches.com>
Cc:     Kees Cook <keescook@...omium.org>,
        "Russell King (Oracle)" <linux@...linux.org.uk>,
        Len Baker <len.baker@....com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-hardening@...r.kernel.org,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/input: Remove all strcpy() uses in favor of
 strscpy()

Hi Joe,

On Mon, Aug 02, 2021 at 11:57:40AM -0700, Joe Perches wrote:
> On Mon, 2021-08-02 at 09:13 -0700, Kees Cook wrote:
> > I'm wondering, instead, if we could convert strcpy() into this instead
> > of adding another API? I.e. convert all the places that warn (if this
> > were strcpy), and then land the conversion.
>
> Perhaps not as strcpy is a builtin.
>
> It might be easier as a cocci script.  Something like:
>
> @@
> char [] dest;
> constant char [] src;
> @@
>
> *	strcpy(dest, src)
>
> There are some additional test that needs to be added so that
> only length(src) > length(dest) is reported.
>
Thanks for the ideas. I will think on this.

Regards,
Len