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tripwire and changing device numbers
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jagdpanther
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Joined: 22 Nov 2003
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PostPosted: Mon Oct 15, 2018 5:45 pm    Post subject: tripwire and changing device numbers Reply with quote

On one of my Gentoo systems, after a reboot and a subsequent "/usr/sbin/tripwire --check", every file that tripwire-2.4.3.7 tests shows a changed "device number". For example, a very small part of /usr/sbin/twprint -m r -r <tripwire_report>.twr shows:


Code:
 Modified object name:  /usr/bin/cmake

  Property:            Expected                    Observed                   
  -------------        -----------                 -----------                 
* Device Number        66308                       66309                       


Modified object name:  /usr/bin/cmake-gui

  Property:            Expected                    Observed                   
  -------------        -----------                 -----------                 
* Device Number        66308                       66309                       


Modified object name:  /usr/bin/cmis-client

  Property:            Expected                    Observed                   
  -------------        -----------                 -----------                 
* Device Number        66308                       66309                       


Modified object name:  /usr/bin/cmis-client-0.5

  Property:            Expected                    Observed                   
  -------------        -----------                 -----------                 
* Device Number        66308                       66309         


Any idea why the device number is changing after a reboot? This system's storage is two NVMe SSDs. I have a second Gentoo system with one NVMe SSD and one spinning HDD and it does not show this problem.

I guess I could read the Tripwire documentation and change my policy file to tell Tripwire to NOT check a file's device number.
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cboldt
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Joined: 24 Aug 2005
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PostPosted: Tue Oct 16, 2018 1:29 pm    Post subject: Reply with quote

Those are regular files, and appears they are now being found on "the other" NVMe SSD. The device ID is a hardware ID.

If you've changed hardware or moved /bin to the other drive, those are "one time" or infrequent events. I'd just rebuild the tripwire database with the new/current config and leave it at that.
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jagdpanther
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PostPosted: Tue Oct 16, 2018 3:58 pm    Post subject: Reply with quote

cboldt:

Thanks for the reply.

I have run 'tripwire -m u -r <tripwire report>' to update the tripwire database. Then all is well (except for changes caused by emerge which further 'tripwire -m u -r <tripwire report>' will update) untill a reboot. Sometimes when I reboot, ALL files have that "Device Number" change detected by tripwire.

I suspect (and this is just a guess) that the system does not always see the same NVMe drive first and this causes the device number change. If this is true then how do I fix it?
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cboldt
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PostPosted: Tue Oct 16, 2018 5:41 pm    Post subject: Reply with quote

Yes, I think you are right.

I don't know how to get consistent device assignment at boot for NVMe, just no experience with that. Might be a BIOS. EFI function, or a UDEV function. From a little bit of searching, I think udev can handle the consistent device naming for NVMe devices.

Obviously your fstab is in good order, as the system boots regardless of the device ID (/dev placement) assigned at boot.
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