SRU: Bug #242448 - Hardy ecryptfs can cause data loss

[Ben Collins]

On Mon, 2008-06-23 at 13:50 -0600, Tim Gardner wrote:
> 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

Doesn't look like it will change ABI, so ACK from me.