linux-kernel - 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: <7e44d224-ce7e-909d-e91e-9a643b5fcd71@molgen.mpg.de>
Date:   Tue, 13 Aug 2019 18:15:51 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     x86@...nel.org
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: 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]

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


Kind regards,

Paul


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