linux-kernel - Re: [PATCH] ARM: kdump: Avoid overflow when converting pfn to physaddr

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Date:	Sat, 22 Mar 2014 13:14:43 +0800
From:	Liu hua <sdu.liu@...wei.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	<wangnan0@...wei.com>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <peifeiyue@...wei.com>
Subject: Re: [PATCH] ARM: kdump: Avoid overflow when converting pfn to physaddr

On 2014/3/18 18:48, Russell King - ARM Linux wrote:
> On Tue, Mar 18, 2014 at 06:20:42PM +0800, Liu Hua wrote:
>> When we configure CONFIG_LPAE=y, pfn << PAGE_SHIFT will
>> overflow if pfn >= 0x100000 in copy_oldmem_page.
>>
>> So use __pfn_to_phys for converting.
> 
> Yes.  The sad thing is that if you grep the kernel for similar things,
> it's littered with this problem.  I'm not sure whether anyone
> particularly "owns" the crash_dump.c file - Mika Westerberg and
> Olaf Hering were the last two to touch it... I guess put this in my
> patch system please.
> 
> Thanks.
> 

Yes, I found this problem in serval places after a quick review. I will
do a check on this.

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