linux-kernel - Re: [PATCH] m68k/atari: Avoid VLA use in atari_switches

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAMuHMdWG_s3Oc4DH=70CAKRCGn-bLwO+Gq2UsBd1reeqWE7_Cg@mail.gmail.com>
Date:   Tue, 8 Jan 2019 14:47:31 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] m68k/atari: Avoid VLA use in atari_switches_setup()

Hi Arnd,

On Tue, Jan 8, 2019 at 2:25 PM Arnd Bergmann <arnd@...db.de> wrote:
> On Mon, Jan 7, 2019 at 10:29 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > With gcc 7.3.0:
> >
> >     arch/m68k/atari/config.c: In function ‘atari_switches_setup’:
> >     arch/m68k/atari/config.c:151:2: warning: ISO C90 forbids variable length array ‘switches’ [-Wvla]
> >       char switches[strlen(str) + 1];
> >       ^~~~
> >
> > Replace the variable size by the maximum kernel command line size (512
> > bytes), which is an upper limit for all suboptions.
> >
> > Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>
> Seems fine as long as COMMAND_LINE_SIZE never grows a lot. Some

If that ever happens, it will be caught by -Wframe-larger-than=1024.

> architectures use 1024 or 2048, but m68k currently has 256 (you write
> 512 here).

Thanks for noticing, will fix!

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