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  1. 20 4月, 2010 4 次提交
    • T
      eCryptfs: Copy lower directory inode times and size on link · 3a8380c0
      由 Tyler Hicks 提交于 
      The timestamps and size of a lower inode involved in a link() call was
being copied to the upper parent inode.  Instead, we should be
copying lower parent inode's timestamps and size to the upper parent
inode.  I discovered this bug using the POSIX test suite at Tuxera.
Signed-off-by: NTyler Hicks <tyhicks@linux.vnet.ibm.com>
      3a8380c0
    • J
      ecryptfs: fix use with tmpfs by removing d_drop from ecryptfs_destroy_inode · 133b8f9d
      由 Jeff Mahoney 提交于 
      Since tmpfs has no persistent storage, it pins all its dentries in memory
so they have d_count=1 when other file systems would have d_count=0.
->lookup is only used to create new dentries. If the caller doesn't
instantiate it, it's freed immediately at dput(). ->readdir reads
directly from the dcache and depends on the dentries being hashed.

When an ecryptfs mount is mounted, it associates the lower file and dentry
with the ecryptfs files as they're accessed. When it's umounted and
destroys all the in-memory ecryptfs inodes, it fput's the lower_files and
d_drop's the lower_dentries. Commit 4981e081 added this and a d_delete in
2008 and several months later commit caeeeecf removed the d_delete. I
believe the d_drop() needs to be removed as well.

The d_drop effectively hides any file that has been accessed via ecryptfs
from the underlying tmpfs since it depends on it being hashed for it to
be accessible. I've removed the d_drop on my development node and see no
ill effects with basic testing on both tmpfs and persistent storage.

As a side effect, after ecryptfs d_drops the dentries on tmpfs, tmpfs
BUGs on umount. This is due to the dentries being unhashed.
tmpfs->kill_sb is kill_litter_super which calls d_genocide to drop
the reference pinning the dentry. It skips unhashed and negative dentries,
but shrink_dcache_for_umount_subtree doesn't. Since those dentries
still have an elevated d_count, we get a BUG().

This patch removes the d_drop call and fixes both issues.

This issue was reported at:
https://bugzilla.novell.com/show_bug.cgi?id=567887Reported-by: NÁrpád Bíró <biroa@demasz.hu>
Signed-off-by: NJeff Mahoney <jeffm@suse.com>
Cc: Dustin Kirkland <kirkland@canonical.com>
Cc: stable@kernel.org
Signed-off-by: NTyler Hicks <tyhicks@linux.vnet.ibm.com>
      133b8f9d
    • C
      ecryptfs: fix error code for missing xattrs in lower fs · cfce08c6
      由 Christian Pulvermacher 提交于 
      If the lower file system driver has extended attributes disabled,
ecryptfs' own access functions return -ENOSYS instead of -EOPNOTSUPP.
This breaks execution of programs in the ecryptfs mount, since the
kernel expects the latter error when checking for security
capabilities in xattrs.
Signed-off-by: NChristian Pulvermacher <pulvermacher@gmx.de>
Cc: stable@kernel.org
Signed-off-by: NTyler Hicks <tyhicks@linux.vnet.ibm.com>
      cfce08c6
    • T
      eCryptfs: Decrypt symlink target for stat size · 3a60a168
      由 Tyler Hicks 提交于 
      Create a getattr handler for eCryptfs symlinks that is capable of
reading the lower target and decrypting its path.  Prior to this patch,
a stat's st_size field would represent the strlen of the encrypted path,
while readlink() would return the strlen of the decrypted path.  This
could lead to confusion in some userspace applications, since the two
values should be equal.

https://bugs.launchpad.net/bugs/524919Reported-by: NLoïc Minier <loic.minier@canonical.com>
Cc: stable@kernel.org
Signed-off-by: NTyler Hicks <tyhicks@linux.vnet.ibm.com>
      3a60a168
  3. 24 3月, 2010 4 次提交
  5. 20 3月, 2010 12 次提交
  7. 19 3月, 2010 20 次提交