linux-imx/fs/ecryptfs
Tyler Hicks e06b5bf516 eCryptfs: Allow 2 scatterlist entries for encrypted filenames
commit 8d08dab786 upstream.

The buffers allocated while encrypting and decrypting long filenames can
sometimes straddle two pages. In this situation, virt_to_scatterlist()
will return -ENOMEM, causing the operation to fail and the user will get
scary error messages in their logs:

kernel: ecryptfs_write_tag_70_packet: Internal error whilst attempting
to convert filename memory to scatterlist; expected rc = 1; got rc =
[-12]. block_aligned_filename_size = [272]
kernel: ecryptfs_encrypt_filename: Error attempting to generate tag 70
packet; rc = [-12]
kernel: ecryptfs_encrypt_and_encode_filename: Error attempting to
encrypt filename; rc = [-12]
kernel: ecryptfs_lookup: Error attempting to encrypt and encode
filename; rc = [-12]

The solution is to allow up to 2 scatterlist entries to be used.

Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
2011-08-01 13:54:53 -07:00
..
crypto.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6 2010-04-19 14:20:32 -07:00
debug.c eCryptfs: update comment and debug statement 2007-10-16 09:43:11 -07:00
dentry.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
ecryptfs_kernel.h switch ecryptfs_write() to struct inode *, kill on-stack fake files 2010-05-21 18:31:28 -04:00
file.c fs/ecryptfs/file.c: introduce missing free 2010-08-13 13:30:52 -07:00
inode.c eCryptfs: Copy up lower inode attrs in getattr 2011-03-31 11:58:09 -07:00
Kconfig eCryptfs: Remove Kconfig NET dependency and select MD5 2009-10-08 11:31:36 -05:00
keystore.c eCryptfs: Allow 2 scatterlist entries for encrypted filenames 2011-08-01 13:54:53 -07:00
kthread.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
main.c Ban ecryptfs over ecryptfs 2010-05-21 18:31:27 -04:00
Makefile eCryptfs: remove netlink transport 2008-10-16 11:21:39 -07:00
messaging.c ecryptfs: Bugfix for error related to ecryptfs_hash_buckets 2010-07-28 19:59:24 -07:00
miscdev.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
mmap.c eCryptfs: Unlock page in write_begin error path 2011-03-31 11:58:50 -07:00
read_write.c switch ecryptfs_write() to struct inode *, kill on-stack fake files 2010-05-21 18:31:28 -04:00
super.c fix a couple of ecryptfs leaks 2010-05-21 18:31:13 -04:00