linux-kernel - Re: linux-next: build failure after merge of the akpm tree

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Message-ID: <CAGXu5jK4wv2exKT3HnKG8TuHOWuDjKJx214y_q1QErg8djTQ9Q@mail.gmail.com>
Date:   Tue, 1 Aug 2017 11:40:33 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: linux-next: build failure after merge of the akpm tree

On Mon, Jul 31, 2017 at 11:25 PM, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> Hi Andrew,
>
> After merging the akpm tree, today's linux-next build (powerpc
> allyesconfig) failed like this:
>
> In file included from arch/powerpc/include/asm/paca.h:19:0,
>                  from arch/powerpc/include/asm/hw_irq.h:42,
>                  from arch/powerpc/include/asm/irqflags.h:11,
>                  from include/linux/irqflags.h:15,
>                  from include/linux/spinlock.h:53,
>                  from include/linux/wait.h:8,
>                  from include/linux/wait_bit.h:7,
>                  from include/linux/fs.h:5,
>                  from include/linux/buffer_head.h:11,
>                  from fs/adfs/dir_f.c:12:
> In function 'memcpy',
>     inlined from '__adfs_dir_put' at fs/adfs/dir_f.c:318:2,
>     inlined from 'adfs_f_update' at fs/adfs/dir_f.c:403:2:
> include/linux/string.h:305:4: error: call to '__read_overflow2' declared with attribute error: detected read beyond size of object passed as 2nd parameter
>     __read_overflow2();
>     ^
>
> I don't know why this has turned up now.  I have just left it broken
> for now and would appreciate any fix.

Thanks for the heads-up! I'm not sure why this suddenly appeared
either, but Arnd has sent a patch for this now.

-Kees

-- 
Kees Cook
Pixel Security