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From: Lee Davis <l.davis37@ymail.com>
To: "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
Subject: EXT4 partition changes every time it's mounted. (How to stop this?)
Date: Sat, 21 May 2011 12:45:32 -0700 (PDT)	[thread overview]
Message-ID: <476510.14310.qm@web125206.mail.ne1.yahoo.com> (raw)

Hi folks,

I'm setting up a Linux system with full disk encryption. I've written a script (to run on every boot) which will verify that neither the MBR or /boot partition (ext4) has been modified.

Problem is that every time I boot up the system, my /boot partition hashes differently.

Trying to solve this, I set the /boot partition to mount as read only in fstab. I then took individual hashes of every file on /boot. After I rebooted none of the files had changed (and there were no new files), yet the filesystem hashed as a whole had changed.

I'm guessing there is something behind the scenes which is changed/updated each time the filesystem is mounted? If so, can it be disabled?

Any advice would be greatly appreciated!

Cheers,
Lee


             reply	other threads:[~2011-05-21 19:51 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-21 19:45 Lee Davis [this message]
2011-05-22 11:47 ` EXT4 partition changes every time it's mounted. (How to stop this?) Theodore Tso
2011-05-23  4:39   ` Lee Davis
2011-05-26  6:15     ` Lee Davis

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