linux-kernel - Re: Build regressions/improvements in v6.5-rc3

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Message-ID: <CAMuHMdXRiacSxqDzYmakWAQB99kYvY0Bi9zALP9ZnC9Xs_xO5g@mail.gmail.com>
Date:   Mon, 14 Aug 2023 18:20:59 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org, linux-wireless@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-parisc@...r.kernel.org, linux-sh@...r.kernel.org
Subject: Re: Build regressions/improvements in v6.5-rc3

Hi Kees,

On Sat, Jul 29, 2023 at 12:57 AM Kees Cook <keescook@...omium.org> wrote:
> On Mon, Jul 24, 2023 at 02:43:02PM +0200, Geert Uytterhoeven wrote:
> > On Mon, 24 Jul 2023, Geert Uytterhoeven wrote:
> > > JFYI, when comparing v6.5-rc3[1] to v6.5-rc2[3], the summaries are:
> > >  - build errors: +5/-0
> >
> >   + /kisskb/src/include/linux/fortify-string.h: 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]:  => 583:25, 493:25
> >
> > mips-gcc13/mips-allmodconfig
> >
> > Full context:
> >
> >     In function 'fortify_memset_chk',
> >       inlined from 'memset_io' at /kisskb/src/arch/mips/include/asm/io.h:486:2,
> >       inlined from 'build_auth_frame' at /kisskb/src/drivers/net/wireless/legacy/ray_cs.c:2697:2:
> >     /kisskb/src/include/linux/fortify-string.h:493:25: 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]
> >       493 |                         __write_overflow_field(p_size_field, size);
> >         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >     In function 'fortify_memcpy_chk',
> >       inlined from 'memcpy_toio' at /kisskb/src/arch/mips/include/asm/io.h:494:2,
> >       inlined from 'translate_frame' at /kisskb/src/drivers/net/wireless/legacy/ray_cs.c:955:3,
> >       inlined from 'ray_hw_xmit.constprop' at /kisskb/src/drivers/net/wireless/legacy/ray_cs.c:912:12:
> >     /kisskb/src/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);
> >         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > Single-element flexible array abuse in drivers/net/wireless/legacy/rayctl.h:tx_msg.var
>
> ^^^^
> is this line from you or is there a tool outputting this? Because, yes,

It is a line from me.

(should I take it as a compliment that I start sounding like a tool? ;-)

> very true:
>
> struct tx_msg {
>     struct tib_structure tib;
>     struct phy_header phy;
>     struct mac_header mac;
>     UCHAR  var[1];
> };
>
> I'll send a patch.

Thanks, I noticed you took care while I was enjoying summer holidays ;-)

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds