android_kernel_motorola_sm6225/fs/ecryptfs
Michael Halcrow e4465fdaeb eCryptfs: make ecryptfs_prepare_write decrypt the page
When the page is not up to date, ecryptfs_prepare_write() should be
acting much like ecryptfs_readpage(). This includes the painfully
obvious step of actually decrypting the page contents read from the
lower encrypted file.

Note that this patch resolves a bug in eCryptfs in 2.6.24 that one can
produce with these steps:

# mount -t ecryptfs /secret /secret
# echo "abc" > /secret/file.txt
# umount /secret
# mount -t ecryptfs /secret /secret
# echo "def" >> /secret/file.txt
# cat /secret/file.txt

Without this patch, the resulting data returned from cat is likely to
be something other than "abc\ndef\n".

(Thanks to Benedikt Driessen for reporting this.)

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Cc: Benedikt Driessen <bdriessen@escrypt.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-04 16:35:16 -08:00
..
crypto.c ecryptfs: check for existing key_tfm at mount time 2008-02-06 10:41:13 -08:00
debug.c eCryptfs: update comment and debug statement 2007-10-16 09:43:11 -07:00
dentry.c Embed a struct path into struct nameidata instead of nd->{dentry,mnt} 2008-02-14 21:13:33 -08:00
ecryptfs_kernel.h ecryptfs: check for existing key_tfm at mount time 2008-02-06 10:41:13 -08:00
file.c eCryptfs: Minor fixes to printk messages 2008-02-06 10:41:12 -08:00
inode.c Embed a struct path into struct nameidata instead of nd->{dentry,mnt} 2008-02-14 21:13:33 -08:00
keystore.c eCryptfs: change the type of cipher_code from u16 to u8 2008-02-06 10:41:13 -08:00
main.c Introduce path_put() 2008-02-14 21:13:33 -08:00
Makefile eCryptfs: read_write.c routines 2007-10-16 09:43:12 -07:00
messaging.c ecryptfs: fix unlocking in error paths 2007-12-23 12:54:37 -08:00
mmap.c eCryptfs: make ecryptfs_prepare_write decrypt the page 2008-03-04 16:35:16 -08:00
netlink.c [NETNS]: Consolidate kernel netlink socket destruction. 2008-01-28 15:08:07 -08:00
read_write.c fs/ecryptfs/: possible cleanups 2008-02-06 10:41:12 -08:00
super.c ecryptfs: remove debug as mount option, and warn if set via modprobe 2008-02-06 10:41:12 -08:00