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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Message-ID: <20190815124306.GA17581@kroah.com>
Date:   Thu, 15 Aug 2019 14:43:06 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     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 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?

thanks,

greg k-h