Re: how to extract vmlinux from vmlinuz?

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"Robert P. J. Day" <rpjday@xxxxxxxxxxxxxx> writes:

>   i know i've asked this before but is there a way to extract the
> original vmlinux kernel executable from the corresponding vmlinuz file
> that's installed in /boot?  that would require stripping the piggyback
> header and decompression code and so on, but i was wondering if
> there's a single utility out there that handles all that.  thanks.
>
> rday

Seriously, a quick google search on the matter spits _many_ results. 
One of those is this cute one-liner:
http://jcmdev0.blogspot.com/2009/12/one-liner-to-extract-vmlinuz-to-vmlinux.html
which unfortunately is wrong (byte pattern is screwed up), but with a quick fix it becomes:
dd if=/boot/vmlinuz skip=`grep -a -b -o -m 1 -e $'\x1f\x8b\x08\x00' /boot/vmlinuz | cut -d: -f 1` bs=1 | zcat > /tmp/vmlinux
which should work alright.

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