linux-kernel - Re: [PATCH v7u1 22/31] x86, boot: add fields to support load bzImage and ramdisk above 4G

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Message-ID: <50F46304.3010108@zytor.com>
Date:	Mon, 14 Jan 2013 11:56:52 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kiszka <jan.kiszka@....de>,
	Jason Wessel <jason.wessel@...driver.com>,
	linux-kernel@...r.kernel.org, Rob Landley <rob@...dley.net>,
	Matt Fleming <matt.fleming@...el.com>,
	Gokul Caushik <caushik1@...il.com>,
	Josh Triplett <josh@...htriplett.org>,
	Joe Millenbach <jmillenbach@...il.com>
Subject: Re: [PATCH v7u1 22/31] x86, boot: add fields to support load bzImage
 and ramdisk above 4G

On 01/14/2013 11:50 AM, Yinghai Lu wrote:
> On Mon, Jan 14, 2013 at 10:59 AM, H. Peter Anvin <hpa@...or.com> wrote:
>> No, there were other fields that were also left uninitialized, per your
>> analysis from last year.  I don't remember the details, but I seem to
>> recall they included the EFI and graphics-related fields.
>>
>> So yes, just zero them all out.
> 
> ?
> 

Yep.

> +static void sanitize_real_mode(struct boot_params *real_mode)
> +{
> +       if (real_mode->sentinel) {
> +               /*fields in boot_params are not valid, clear them */
> +               memset(&real_mode->olpc_ofw_header, 0,
> +                      (char *)&real_mode->alt_mem_k -
> +                       (char *)&real_mode->olpc_ofw_header);
> +               memset(&real_mode->_pad7[0], 0,
> +                      (char *)&real_mode->edd_mbr_sig_buffer[0] -
> +                       (char *)&real_mode->_pad7[0]);
> +               memset(&real_mode->_pad8[0], 0,
> +                      (char *)&real_mode->eddbuf[0] -
> +                       (char *)&real_mode->_pad8[0]);
> +               memset(&real_mode->_pad9[0], 0, sizeof(real_mode->_pad9));
> +       }
> +}
> +
> 

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