[PATCH 0/1] [Lucid][SRU] eCryptfs: Handle failed metadata read in lookup

[Herton Ronaldo Krzesinski]

On Thu, Mar 01, 2012 at 04:52:41PM +0000, Colin King wrote:
> From: Colin Ian King <colin.king at canonical.com>
> 
> SRU Justification:
> 
> When failing to read the lower file's crypto metadata during a lookup,
> eCryptfs must continue on without throwing an error. For example, there
> may be a plaintext file in the lower mount point that the user wants to
> delete through the eCryptfs mount.
> 
> If an error is encountered while reading the metadata in lookup(), the
> eCryptfs inode's size could be incorrect. We must be sure to reread the
> plaintext inode size from the metadata when performing an open() or
> setattr(). The metadata is already being read in those paths, so this
> adds minimal performance overhead.
> 
> BugLink: http://bugs.launchpad.net/bugs/509180
> 
> Note:
> 
> This patch is a backport by Tim Gardner that was SRU'd back in 20 Jul 2011
> but wasn't tested and so was reverted as part of the SRU process.  I'm
> sending back to the list again as I think it should be included. 
> 
> Test:
> 
> See https://bugs.launchpad.net/ecryptfs/+bug/509180/comments/50,
> without this patch, the file as garbage at the end of the, file. With
> the fix, the file contains just the expected data with no garbage at
> the end.
> 
> I've also got a suitable test working for the ecryptfs test suite 
> which I hope will be included fairly shortly.
> 
> Tim Gardner (1):
>   eCryptfs: Handle failed metadata read in lookup

Ack, I guess the testcase got lost on the bug noise originally, other
issues were mixed up, and people are still complaining of problems in
Oneiric/Precise which has the fix already, which should be in new bug
reports.

> 
>  fs/ecryptfs/crypto.c          |   21 +++++++++++++++++++++
>  fs/ecryptfs/ecryptfs_kernel.h |    2 ++
>  fs/ecryptfs/file.c            |    3 ++-
>  fs/ecryptfs/inode.c           |   18 +++---------------
>  4 files changed, 28 insertions(+), 16 deletions(-)
> 
> 
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-- 
[]'s
Herton