linux-kernel - Re: [Patch BUGFIX] kcore: fix its wrong size on x86

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Message-ID: <20090618044055.GB6133@cr0.nay.redhat.com>
Date:	Thu, 18 Jun 2009 12:40:55 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Amerigo Wang <xiyou.wangcong@...il.com>,
	Tao Ma <tao.ma@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [Patch BUGFIX] kcore: fix its wrong size on x86_64

On Wed, Jun 17, 2009 at 08:37:40PM -0700, Eric W. Biederman wrote:
>Amerigo Wang <xiyou.wangcong@...il.com> writes:
>
>> On Tue, Jun 16, 2009 at 12:27:36PM -0700, Eric W. Biederman wrote:
>>>Américo Wang <xiyou.wangcong@...il.com> writes:
>>>>> I think a case can be made either way.  In practice neither answer
>>>>> gives us a dense offset space on x86_64 so I think I prefer the
>>>>> current definition which sets or clears the high bits as opposed
>>>>> to something that mangles the address more.
>>>>>
>>>>
>>>> I am trying to dig more... There must be something wrong there.
>>>
>>>How so?
>>
>> See what you will get for kc_vaddr_to_offset(__va(0))?
>> It is supposed to be 0.
>
>I see: 0x0000880000001000  That extra 0x1000 looks suspicous.


huh? 0x0000880000000000 not?

>
>It MUST NOT be 0. That is where the ELF header lives in the file.

Of course I knew this.

Just read the code:

     phdr->p_offset = kc_vaddr_to_offset(m->addr) + dataoff;

So it should be 0, 'dataoff' is there...
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