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Date: Tue, 13 Sep 2011 16:46:45 +0530
From: Mahesh Jagannath Salgaonkar <mahesh@linux.vnet.ibm.com>
MIME-Version: 1.0
Subject: Re: makedumpfile: Add erased information in compressed kdump file
	and ELF formatted dumpfile
References: <682646784.634954.1315851890438.JavaMail.root@zmail05.collab.prod.int.phx2.redhat.com>
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To: Dave Anderson <anderson@redhat.com>
Cc: V Srivatsa <vsrivatsa@in.ibm.com>, kexec@lists.infradead.org, Ananth N Mavinakayanahalli <ananth@in.ibm.com>, Ken'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp>, Reinhard <BUENDGEN@de.ibm.com>

On 09/12/2011 11:54 PM, Dave Anderson wrote:
> 
> Hi Mahesh,
> 
> Now that this feature is in makedumpfile-1.4.0, I presume that you
> have crash utility "warning" patches underway?

Yup. I am working on it, will post the patches very soon.

> 
> Also, can you confirm that compressed or kdumps with (or without)
> eraseinfo data can still be handled with no problem by the current
> version of the crash utility?  I'm not talking about the ramifications
> of whatever kernel data may have been erased, but whether the changes to
> the dumpfile headers could cause a problem.  I'm presuming that the
> compressed kdump eraseinfo data would be invisible to an older version
> of crash, and that ELF kdump eraseinfo would just show up as an (unused)
> ELF note -- but I just want to make sure. 

Yes. The changes to dumpfile header and addition of eraseinfo data/ELF
note will not cause any problems with older crash version. With the
current version of crash the ELF kdump eraseinfo note would show up as
below:

Elf64_Nhdr:
               n_namesz: 10 ("ERASEINFO")
               n_descsz: 56
                 n_type: 0 (?)
                         2065736172650000 72616a5f64657263
                         697320656d616e2e 650a36353220657a
                         656e692065736172 736f746f72705f74
                         303120657a697320

Thanks,
-Mahesh.


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