See also my comments #104, #128, #129, #131, #132, #134, #141.
The above ecryptfs corruption is reduced but not gone in Ubuntu 11.10
Oneiric:
Linux ubuntu 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC
2011 x86_64 x86_64 x86_64 GNU/Linux
I repeatedly ran md5sum on a read-only ecryptfs partition with 18GB of
files (many with multiple hard links) and the md5sum results *changed*
on a few files on some of the runs.
It took many more runs (several dozen) to discover the corruption than
when using the 2.6.38 kernel, and *only* the md5sums changed between
runs, not the file sizes as well as was true with 2.6.38. I also saw the
corruption on files with only one link, where under 2.6.38 it seemed to
happen only on files with more than one link.
I'm running these tests using a VMware install of a fully-updated Ubuntu
11.10 Oneiric with a separate 32GB virtual disk containing the 18GB
ecryptfs partition.
I'm looping a full md5sum of all 18GB in one terminal window and in a
second window I'm looping a simultaneous md5sum of a 4.2GB subdirectory.
When corruption happens, both windows show it happening on the same
file(s). Out of 48 runs over the full 18GB so far, four runs turned up
files with different checksums. In the other loop, out of 171 runs over
the 4.2GB subdirectory so far, 11 runs turned up files with different
checksums.
I did see some kern.log errors early in the testing process:
Oct 20 14:57:49 ubuntu kernel: [ 65.128562] EXT4-fs (sdb1): mounted filesystem
with ordered data mode. Opts: (null)
Oct 20 16:04:30 ubuntu kernel: [ 4066.054573] ecryptfs_decrypt_page: Error
attempting to read lower page; rc = [-4]
Oct 20 16:04:30 ubuntu kernel: [ 4066.054580] ecryptfs_readpage: Error
decrypting page; rc = [-4]
Oct 20 16:47:30 ubuntu kernel: [ 6645.362178] ecryptfs_decrypt_page: Error
attempting to read lower page; rc = [-4]
Oct 20 16:47:30 ubuntu kernel: [ 6645.362263] ecryptfs_readpage: Error
decrypting page; rc = [-4]
Those errors all appeared long before the runs showing corruption.
/dev/sdb1 on /mnt/sdb1 type ext4 (ro)
/mnt/sdb1/idallen-ecryptfs/.Private on /home/idallen-ecryptfs type ecryptfs
(ro,ecryptfs_unlink_sigs,ecryptfs_cipher=aes,ecryptfs_key_bytes=16,ecryptfs_sig=xxxxxxxxxxxxxxxx,ecryptfs_fnek_sig=yyyyyyyyyyyyyyyy)
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https://bugs.launchpad.net/bugs/509180
Title:
ecryptfs sometimes seems to add trailing garbage to encrypted files
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