[Bug 242448] [NEW] ecryptfs: remove unnecessary page decrypt call

[Dustin Kirkland]

Public bug reported:

This bug can cause data loss on an ecryptfs mounted filesystem.

The test case looks like this:

# mkdir /tmp/dir1 /tmp/dir2
# mount -t ecryptfs /tmp/dir1 /tmp/dir2
(any ecryptfs mount options are fine, choose defaults)
# cp /usr/share/common-licenses/GPL-3 /tmp/dir2
# umount /tmp/dir2
# mount -t ecryptfs /tmp/dir1 /tmp/dir2
(choose same options/passphrase as last mount)
# echo foo >> /tmp/dir2/GPL-3
# tail /tmp/dir2/GPL-3
# reset

You will see badly decrypted data printed to screen, whereas you should
see the GPLv3 plus "foo" printed to screen.  The data in this file is
permanently hosed.

The fix for this bug was applied upstream against 2.6.26, and is already
in the intrepid kernel.

The git commit diff can be seen here:
 * http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-intrepid.git;a=commitdiff;h=d3e49afbb66109613c3474f2273f5830ac2dcb09

I will gladly test a new Hardy kernel as soon as it becomes available.

:-Dustin

** Affects: linux
     Importance: Unknown
         Status: Unknown

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: New

** Bug watch added: SourceForge.net Tracker #1997977
   http://sourceforge.net/support/tracker.php?aid=1997977

** Also affects: linux via
   http://sourceforge.net/support/tracker.php?aid=1997977
   Importance: Unknown
       Status: Unknown

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium
       Target: None => ubuntu-8.04.2

-- 
ecryptfs: remove unnecessary page decrypt call
https://bugs.launchpad.net/bugs/242448
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