[Bug 242448] Re: Hardy ecryptfs can cause data loss

[Tim Gardner]

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


** Summary changed:

- ecryptfs: remove unnecessary page decrypt call
+ Hardy ecryptfs can cause data loss

-- 
Hardy ecryptfs can cause data loss
https://bugs.launchpad.net/bugs/242448
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