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: <50F455A3.4070706@zytor.com>
Date:	Mon, 14 Jan 2013 10:59:47 -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 10:57 AM, Yinghai Lu wrote:
>>
>> If the sentinel is flagged, zero *all fields not explicitly set by the
>> broken versions of kexec*, not just your new "ext" fields.
> 
> other fields are pad* fields, so do we zero out them
> with memset with exact address?
> so next times, when someone change pad fields to other ext_*,
> they don't need to change code again here.
> 

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.

	-hpa


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