linux-kernel - Re: [PATCH 1/2] x86: fix panic when handling "mem={invalid}" param

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Message-ID: <4D4C5F88.30506@zytor.com>
Date:	Fri, 04 Feb 2011 12:20:24 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Kamal Mostafa <kamal@...onical.com>, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Len Brown <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86: fix panic when handling "mem={invalid}" param

On 02/04/2011 12:19 PM, Yinghai Lu wrote:
>>
>> All he looks at is when the value returned is zero.  It wouldn't be zero
>> for any actual value, including mem=32M.
>>
> 
> when user pass wrong parameter like less 128M, kernel will not boot either.
> Do we need to sanity check for that?
> 

We could check for the value being smaller than the relocated value of
_end.  That is probably the smallest *fixed* value we can assign.

	-hpa

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