Public bug reported:
encrypted-home directories were broken with the latest upgrade of util-
linux.
The issue is that ecryptfs tries to find a sysfs mount point by reading
/etc/fstab (ie, it wants to find 'sysfs' and '/sys').
in ecryptfs/src/libecryptfs/sysfs.c , ecryptfs_get_version tries to get
the version of ecryptfs in this kernel. and then see if it is capable.
That calls 'get_sysfs_mountpoint' which parses /etc/mtab for the sysfs
entry.
The util-linux upgrade to 2.19.1-2ubuntu1 does not write an entry in
/etc/fstab for sysfs.
The end resupt is that the user ends up with file *content* decrypted, but not
filenames. They'll see a bunch of filenames with "ECRYPTFS_FNEK_ENCRYPTED" in
their name like:
ECRYPTFS_FNEK_ENCRYPTED.FXbGolSeisjWM-Qojv3ajQsDcC-kITIu0KUxZdKsa5gkZBtZLX12p7AKgcrQTja6Hep3FSW8okccMX6-
ECRYPTFS_FNEK_ENCRYPTED.FXbGolSeisjWM-Qojv3ajQsDcC-kITIu0KUxZdKsa5gkZBtZLX12p7AKggO-5p.pSThbVFaNI8aX4-6-
ECRYPTFS_FNEK_ENCRYPTED.FXbGolSeisjWM-Qojv3ajQsDcC-kITIu0KUxZdKsa5gkZBtZLX12p7AKgirB.sNgfbm-8lk0XZWwB-A-
1 possible fix for this is for ecryptfs to read /proc/mounts rather than
/etc/mtab.
A work around for this is to:
a.) log in as another user, edit /etc/mtab and add 'sysfs' entry (see
/proc/mounts for example), then log in as new user
b.) backlevel util-linux and reboot (so /etc/mtab is updated with sysfs entry
via old util-linux).
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: util-linux 2.19.1-2ubuntu1
ProcVersionSignature: Ubuntu 3.0-1.2-generic 3.0.0-rc3
Uname: Linux 3.0-1-generic x86_64
Architecture: amd64
Date: Sun Jun 26 10:50:31 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100318)
ProcEnviron:
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: util-linux
UpgradeStatus: Upgraded to oneiric on 2010-11-15 (222 days ago)
** Affects: ecryptfs-utils (Ubuntu)
Importance: Undecided
Status: New
** Affects: util-linux (Ubuntu)
Importance: High
Status: Confirmed
** Tags: amd64 apport-bug oneiric unity-2d
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https://bugs.launchpad.net/bugs/802197
Title:
no sysfs entry in /etc/mtab breaks encrypted-home
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