Comment 1 for bug 242448

SRU Justification:

Impact: ecryptfs can cause loss of data in certain scenarios

Patch Description: cherry-picked 2.6.25.y d3e49afbb66109613c3474f2273f5830ac2dcb09. The page decrypt calls in ecryptfs_write() are both pointless and buggy. Pointless because ecryptfs_get_locked_page() has already brought the page up to date, and buggy because prior mmap writes will just be blown away by the decrypt call. This patch also removes the declaration of a now-nonexistent function ecryptfs_write_zeros().

Patch: http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-hardy.git;a=commit;h=b85452a23dcdeddc4a4ae1816501e80a16bb14a8

Test Case: see Bug decscription