linux-hardening - Re: [PATCH] dlm: Replace all non-returning strlcpy with strscpy

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Message-ID: <CADmuW3U7tFfSKrQL5TopOYnDNNiHPsC42E3ghWhpqCDtKeOSYg@mail.gmail.com>
Date:   Mon, 22 May 2023 12:18:45 -0400
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Christine Caulfield <ccaulfie@...hat.com>,
        David Teigland <teigland@...hat.com>,
        linux-hardening@...r.kernel.org, cluster-devel@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dlm: Replace all non-returning strlcpy with strscpy

On Thu, May 11, 2023 at 12:26 PM Kees Cook <keescook@...omium.org> wrote:
>
> On Wed, May 10, 2023 at 10:12:37PM +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>
>
> --
> Kees Cook

Friendly ping on this.