linux-kernel - Re: [PATCH] tracing/uprobe: Replace strlcpy() with strscpy()

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Message-ID: <202312011024.8FD7DD329F@keescook>
Date:   Fri, 1 Dec 2023 10:24:52 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] tracing/uprobe: Replace strlcpy() with strscpy()

On Fri, Dec 01, 2023 at 03:27:26PM +0900, Masami Hiramatsu wrote:
> On Thu, 30 Nov 2023 12:56:08 -0800
> Kees Cook <keescook@...omium.org> wrote:
> 
> > strlcpy() reads the entire source buffer first. This read may exceed
> > the destination size limit. This is both inefficient and can lead
> > to linear read overflows if a source string is not NUL-terminated[1].
> > Additionally, it returns the size of the source string, not the
> > resulting size of the destination string. In an effort to remove strlcpy()
> > completely[2], replace strlcpy() here with strscpy().
> > 
> > The negative return value is already handled by this code so no new
> > handling is needed here.
> > 
> > Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy [1]
> > Link: https://github.com/KSPP/linux/issues/89 [2]
> > Cc: Steven Rostedt <rostedt@...dmis.org>
> > Cc: Masami Hiramatsu <mhiramat@...nel.org>
> > Cc: linux-trace-kernel@...r.kernel.org
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> 
> Hi Kees,
> 
> As same as sample's change, should I ask you to pick this to your tree?
> Since it is a kind of a part of series patch. I'm OK for it since this
> does not change the code so much.
> 
> In that case, please feel free to add my Ack.
> 
> Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Either way is fine, but I can take it since I've got a few others
already too. :)

Thanks!

-Kees

-- 
Kees Cook