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Re: some questions aoout extended attribute in my developmenât

To: jinxiu su <sujinxiu@xxxxxxxxx>
Subject: Re: some questions aoout extended attribute in my developmen​t
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Fri, 24 Aug 2012 07:57:16 +1000
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <CAPRu15CvOKd=1405rerOMAy7vVQGuf0fAimPP9=0CinRSNboiQ@xxxxxxxxxxxxxx>
References: <CAPRu15CvOKd=1405rerOMAy7vVQGuf0fAimPP9=0CinRSNboiQ@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Aug 23, 2012 at 05:16:47PM +0800, jinxiu su wrote:
> Hi....I am su, a new linuxer.
> 
> I am doing some development on linux security modules(LSM), and I use
> extended attribute to store the security information.
> 
> But problems encountered..
> 
> when the kernel module that I developed is working a long time ,the
> extended attribute of this file named /lib/ld-2.5.so lost.Exactly, it 's
> replace by zero.
> 
> and in my kernel module ,there is a policy, when create a inode, the
> extended attribute will be initialized to zero. But when I check /lib/
> ld-2.5.so, the inode is not changed, exactly it's not a new inode. I am
> becoming confused....
> 
> I think there must be some fatal bugs in my kernel module.But I am just
> wondering  in which condition  can make a file's extended attribute field
> to be replaced by zero? in which condition can make /lib/ld-2.5.so extended
> attribute to be zero?

No idea. What filesystem did this happen on, and what kernel? it
sounds like the attribute got deleted, or a system upgrade replaced
the file with a new, possibly identical version...

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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