LinuxLists.cc - 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]

2019-08-13 16:18:48

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

Attachments:

smime.p7s (5.05 kB)
S/MIME Cryptographic Signature

2019-08-15 14:52:24

by Greg Kroah-Hartman

[permalink] [raw]

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