linux-kernel - Re: Build error in crypto/marvell/cesa/cipher.c

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Date:   Wed, 28 Jun 2023 21:35:49 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Boris Brezillon <bbrezillon@...nel.org>,
        Arnaud Ebalard <arno@...isbad.org>,
        Srujana Challa <schalla@...vell.com>,
        Mustafa Ismail <mustafa.ismail@...el.com>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>
Subject: Re: Build error in crypto/marvell/cesa/cipher.c

On Wed, 28 Jun 2023 at 20:48, Kees Cook <keescook@...omium.org> wrote:
>
> The unexpected bit is that without -fstrict-flex-arrays=3 (i.e. the
> default since the dawn of time), the compiler treats any array that
> happens to be the last struct member as a flexible array.

Oh. Ok, that explains why it's showing up for me now, at least. It's
an odd rule, but I can see why people would have done that.

I've only seen the zero- and one-sized arrays commonly used for the
traditional "fake flex array", but I guess other sizes can easily
happen.

                 Linus