Re: ext4 superblock overwritten

From	Yvan Masson <yvan.masson@openmailbox.org>
Newsgroups	linux.debian.user
Subject	Re: ext4 superblock overwritten
Date	2016-12-09 09:30 +0100
Message-ID	<sMoJ9-Wn-15@gated-at.bofh.it> (permalink)
References	<sMoJ9-Wn-17@gated-at.bofh.it> <sMozn-T1-9@gated-at.bofh.it>
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Hi,

Le vendredi 09 décembre 2016 à 09:15 +0100, Heinz Nimmervoll a écrit :
> System:
> Embedded board with Atmel SAM9x25
> Debian Wheezy Kernel 3.11.6
> 32GB Samsung SDHC card with ext4 root- partition (journal activated)
> After system running two weeks or so superblock from rootfs (ext4) at
> block 0 got overwritten with "trash data". Here is a hex comparison
> between the an original superblock and the faulty:

What tool did you use to create this picture?
 
> How is it possible, that even the magic number (and everything else)
> got overwritten?
> Why could it ever be overwritten?
> Thx for your help!

Unfortunately I have no answer to give. Any program running as root can
write anywhere on the disk…

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Re: ext4 superblock overwritten Yvan Masson <yvan.masson@openmailbox.org> - 2016-12-09 09:30 +0100

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