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Subject: Re: Warnings whilst building 5.2.0+
To:     Chris Clayton <chris2553@googlemail.com>,
        LKML <linux-kernel@vger.kernel.org>
References: <df7c7cfc-25cf-5b92-91ab-ac355b660233@googlemail.com>
From:   "Enrico Weigelt, metux IT consult" <lkml@metux.net>
Organization: metux IT consult
Message-ID: <d5f09396-a562-7989-8e5b-8337c9c9a036@metux.net>
Date:   Tue, 9 Jul 2019 12:37:35 +0200
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On 09.07.19 08:06, Chris Clayton wrote:

Hi,

> I've pulled Linus' tree this morning and, after running 'make oldconfig', tried a build. During that build I got the
> following warnings, which look to me like they should be fixed. 'git describe' shows v5.2-915-g5ad18b2e60b7 and my
> compiler is the 20190706 snapshot of gcc 9.

Thanks for the report. I'm rebuilding right know anyways, so I'll look
out for it.

> 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 'unsigned char' at offset 491 [-Warray-bounds]
>    43 |   memset(&boot_params->kbd_status, 0,
>       |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    44 |          (char *)&boot_params->hdr -
>       |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    45 |          (char *)&boot_params->kbd_status);
>       |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Can you check older versions, too ? Maybe also trying older gcc ?


--mtx

-- 
Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@metux.net -- +49-151-27565287