linux-kernel - Re: [PATCH] crypto: marvell/cesa

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Date:   Wed, 31 May 2023 18:58:10 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Kees Cook <keescook@...omium.org>
Cc:     arno@...isbad.org, arnd@...nel.org, schalla@...vell.com,
        bbrezillon@...nel.org, davem@...emloft.net,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        linux-crypto@...r.kernel.org
Subject: Re: [PATCH] crypto: marvell/cesa - Fix type mismatch warning

On Tue, May 30, 2023 at 03:48:49PM -0700, Kees Cook wrote:
> On Tue, 23 May 2023 10:33:04 +0200, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> > 
> > Commit df8fc4e934c1 ("kbuild: Enable -fstrict-flex-arrays=3") uncovered
> > a type mismatch in cesa 3des support that leads to a memcpy beyond the
> > end of a structure:
> > 
> > In function 'fortify_memcpy_chk',
> >     inlined from 'mv_cesa_des3_ede_setkey' at drivers/crypto/marvell/cesa/cipher.c:307:2:
> > include/linux/fortify-string.h:583:25: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning]
> >   583 |                         __write_overflow_field(p_size_field, size);
> >       |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > 
> > [...]
> 
> Applied to for-next/hardening, thanks!
> 
> [1/1] crypto: marvell/cesa - Fix type mismatch warning
>       https://git.kernel.org/kees/c/37f3abddda8d

Why did you apply it to your tree? This patch makes sense on its
own regardless of the fortify changes.

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt