linux-kernel - Re: [PATCH] nios2: Replace all non-returning strlcpy with strscpy

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Message-ID: <202306201313.C425BCB@keescook>
Date:   Tue, 20 Jun 2023 13:15:15 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Dinh Nguyen <dinguyen@...nel.org>
Cc:     Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nios2: Replace all non-returning strlcpy with strscpy

On Tue, Jun 13, 2023 at 05:15:41PM -0500, Dinh Nguyen wrote:
> 
> 
> On 5/30/23 18:20, Kees Cook wrote:
> > On Tue, May 30, 2023 at 04:23:58PM +0000, Azeem Shaikh 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].
> > > In an effort to remove strlcpy() completely [2], replace
> > > strlcpy() here with strscpy().
> > > No return values were used, so direct replacement is safe.
> > > 
> > > [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
> > > [2] https://github.com/KSPP/linux/issues/89
> > > 
> > > Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>
> > 
> > Reviewed-by: Kees Cook <keescook@...omium.org>
> > 
> 
> Applied!

Thanks for taking this patch! I just wanted to double-check, though; I
haven't seen it show up in -next yet. Is this still queued?

Thanks!

-Kees

-- 
Kees Cook