linux-hardening - Re: [PATCH v3] drivers/edac/edac

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Date:   Mon, 9 Aug 2021 12:05:04 +0200
From:   Robert Richter <rric@...nel.org>
To:     Len Baker <len.baker@....com>
Cc:     Joe Perches <joe@...ches.com>, Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        Kees Cook <keescook@...omium.org>,
        linux-hardening@...r.kernel.org, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] drivers/edac/edac_mc: Remove all strcpy() uses

On 08.08.21 13:26:17, Len Baker wrote:

> > Perhaps this should use scnprintf rather than strscpy
> > Something like:
> > 			n += scnprintf(buf + n, len - n, "%s",
> > 				       p == e->label ? dim->label : OTHER_LABEL);
> >
> In the first version [1] the scnprintf was used but Robert Richter don't
> see any benefit compared with the current implementation.
> 
> [1] https://lore.kernel.org/linux-hardening/20210725162954.9861-1-len.baker@gmx.com/

Reason is that there is the assumption that p must always point at the
end of the string and its trailing zero byte. I am not opposed using
the string function's return code instead of strlen() to get the
length. But why using formated output if strscpy() can be used?

-Robert