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

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Date:	Mon, 14 Jan 2013 11:50:20 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
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 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.

?

+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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