linux-hardening - Re: [PATCH][next] cifs: Replace a couple of one-element arrays with flexible-array members

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Message-ID: <CAH2r5muz9cGwtX5HF5wL0g9ix=cKs6C35BZObqMr6dgL-sOF-g@mail.gmail.com>
Date:   Wed, 5 Oct 2022 02:01:45 -0500
From:   Steve French <smfrench@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Steve French <sfrench@...ba.org>, Paulo Alcantara <pc@....nz>,
        Ronnie Sahlberg <lsahlber@...hat.com>,
        Shyam Prasad N <sprasad@...rosoft.com>,
        Tom Talpey <tom@...pey.com>, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] cifs: Replace a couple of one-element arrays with
 flexible-array members

merged into cifs-2.6.git for-next

On Tue, Oct 4, 2022 at 10:17 PM Kees Cook <keescook@...omium.org> wrote:
>
> On Tue, Oct 04, 2022 at 08:51:39PM -0500, Gustavo A. R. Silva wrote:
> > One-element arrays are deprecated, and we are replacing them with flexible
> > array members instead. So, replace one-element arrays with flexible-array
> > member in structs negotiate_req and extended_response, and refactor the
> > rest of the code, accordingly.
> >
> > Also, make use of the DECLARE_FLEX_ARRAY() helper to declare flexible
> > array member EncryptionKey in union u. This new helper allows for
> > flexible-array members in unions.
> >
> > Change pointer notation to proper array notation in a call to memcpy()
> > where flexible-array member DialectsArray is being used as destination
> > argument.
> >
> > Important to mention is that doing a build before/after this patch results
> > in no binary output differences.
> >
> > This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> > routines on memcpy() and help us make progress towards globally
> > enabling -fstrict-flex-arrays=3 [1].
> >
> > Link: https://github.com/KSPP/linux/issues/79
> > Link: https://github.com/KSPP/linux/issues/229
> > Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836 [1]
> > Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
>
> Looks good to me; thanks!
>
> Reviewed-by: Kees Cook <keescook@...omium.org>
>
> --
> Kees Cook



-- 
Thanks,

Steve