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To:     LKML <linux-kernel@vger.kernel.org>
From:   Chris Clayton <chris2553@googlemail.com>
Subject: Warnings whilst building 5.2.0+
Message-ID: <df7c7cfc-25cf-5b92-91ab-ac355b660233@googlemail.com>
Date:   Tue, 9 Jul 2019 07:06:57 +0100
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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.

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);
      |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Happy to test any patches, but please cc me as I'm not subscribed to LKML.

Chris