kernel-packages team mailing list archive

[Rocko <rockorequin@xxxxxxxxxxx>]

> I don't like the idea of eCryptfs supporting the clone ioctl by default.
> It would allow an attacker to discover that the files (the original and
> the clone) are the same.

I agree with that reasoning.

In any case, I think that the btrfs clone operation should be disallowed
in ecryptfs as a matter of urgency (upstream as well), since it can
result in data loss, which is far worse than the (presumably small in
practice) disk space savings available though using the clone.

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https://bugs.launchpad.net/bugs/1305335

Title:
  Cutting or copying files on btrfs to ecryptfs results in data loss

Status in eCryptfs:
  Confirmed
Status in The Linux Kernel:
  Unknown
Status in linux package in Ubuntu:
  Confirmed
Status in nautilus package in Ubuntu:
  Invalid

Bug description:
  I've installed a fresh copy of 14.04 beta 2 on a brand-new SSD.  I
  used btrfs as the filesystem.

  I set up a Private folder usying ecryptfs-setup-private.

  I copied a few folders into the Private folder, and the entire
  directory structure and subfolders are copied, including the files
  themselves, yet every file contains 0 bytes.

  However, I can create and save new files in the Private directory.
  Also, folders and files can be correctly copied if I use the command line cp -R.

  Thanks,
  Damon

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: nautilus 1:3.10.1-0ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
  Uname: Linux 3.13.0-23-generic x86_64
  ApportVersion: 2.14.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Apr  9 18:12:56 2014
  EcryptfsInUse: Yes
  GsettingsChanges: b'org.gnome.nautilus.list-view' b'default-column-order' b"['name', 'size', 'type', 'date_modified', 'date_accessed', 'owner', 'group', 'permissions', 'mime_type', 'where']"
  InstallationDate: Installed on 2014-04-05 (4 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  ProcEnviron:
   LANGUAGE=en_CA:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: nautilus
  UpgradeStatus: No upgrade log present (probably fresh install)

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