[PATCH 0/1][Lucid][SRU] eCryptfs: Initialize empty lower files when opening them

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

BugLink: https://launchpad.net/bugs/911507

SRU justification:

Impact:

eCryptfs only initialized lower files in the ecryptfs_create() path.
A number of users have reported empty lower files in beneath their
eCryptfs mounts.  The presence of empty files causes problems due to
the lack of proper cryptographic metadata.

Fix:

Backport upstream commit e3ccaa9761200952cc269b1f4b7d7bb77a5e071b

Testcase:

http://bazaar.launchpad.net/~colin-king/ecryptfs/test-fixes/revision/723

sudo ./tests/run_tests.sh -K -c safe -b 1000000 -D /tmp/image -l /lower -u /upper \
 -f ext2,ext3,ext4,xfs,btrfs -t lp-911507.sh

Without the fix, this test fails. With the fix, it passes.

Note: Tested this against all other eCryptfs tests to ensure we don't regress
plus did 1+ hour soak test of multiple parallel builds.

Colin Ian King (1):
  eCryptfs: Initialize empty lower files when opening them

 fs/ecryptfs/ecryptfs_kernel.h |    1 +
 fs/ecryptfs/file.c            |   71 ++++++++++++++++++++++++++---------------
 fs/ecryptfs/inode.c           |    2 +-
 3 files changed, 47 insertions(+), 27 deletions(-)

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1.7.9.5