linux-kernel - Re: warning: ‘memset’ offset [197, 448] from the object at ‘boot_params’ is out of the bounds of referenced subobject ‘ext_ramdisk_image’ with type, ‘unsigned int’ at offset 192 [-Warray-bounds]

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Date:   Thu, 15 Aug 2019 14:54:32 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Greg KH <gregkh@...uxfoundation.org>
cc:     Paul Menzel <pmenzel@...gen.mpg.de>, x86@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: warning: ‘memset’ offset [197, 448] from the object at ‘boot_params’ is out of the bounds of referenced subobject ‘ext_ramdisk_image’ with type, ‘unsigned int’ at offset 192 [-Warray-bounds]

On Thu, 15 Aug 2019, Greg KH wrote:
> On Tue, Aug 13, 2019 at 06:15:51PM +0200, Paul Menzel wrote:
> > Dear Linux folks,
> > 
> > 
> > No idea, if you are interested in these reports. Building Linux 5.3-rc4,
> > GCC 9.2.0 shows the warning below.
> > 
> > ```
> > In file included from arch/x86/kernel/head64.c:35:
> > In function ‘sanitize_boot_params’,
> >     inlined from ‘copy_bootdata’ at arch/x86/kernel/head64.c:391:2:
> > ./arch/x86/include/asm/bootparam_utils.h:40:3: warning: ‘memset’ offset [197, 448] from the object at ‘boot_params’ is out of the bounds of referenced subobject ‘ext_ramdisk_image’ with type
> >  ‘unsigned int’ at offset 192 [-Warray-bounds]
> >    40 |   memset(&boot_params->ext_ramdisk_image, 0,
> >       |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >    41 |          (char *)&boot_params->efi_info -
> >       |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >    42 |    (char *)&boot_params->ext_ramdisk_image);
> >       |    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > ./arch/x86/include/asm/bootparam_utils.h:43:3: warning: ‘memset’ offset [493, 497] from the object at ‘boot_params’ is out of the bounds of referenced subobject ‘kbd_status’ with type ‘unsig
> > ned char’ at offset 491 [-Warray-bounds]
> >    43 |   memset(&boot_params->kbd_status, 0,
> >       |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >    44 |          (char *)&boot_params->hdr -
> >       |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >    45 |          (char *)&boot_params->kbd_status);
> >       |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > ```
> 
> Yeah, it shows up on my builds as well :(
> 
> Any chance you can make a fix for this?

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/boot&id=a156cadef2fe445ac423670eace517b39a01ccd0

I guess I need to reprioritize that and mark it for stable....