From 5cc0261b6abb36ceeaf5da4ea28dcc8b360899c7 Mon Sep 17 00:00:00 2001 From: Tyler Hicks Date: Thu, 23 Sep 2010 02:35:04 -0500 Subject: eCryptfs: Clear LOOKUP_OPEN flag when creating lower file commit 2e21b3f124eceb6ab5a07c8a061adce14ac94e14 upstream. eCryptfs was passing the LOOKUP_OPEN flag through to the lower file system, even though ecryptfs_create() doesn't support the flag. A valid filp for the lower filesystem could be returned in the nameidata if the lower file system's create() function supported LOOKUP_OPEN, possibly resulting in unencrypted writes to the lower file. However, this is only a potential problem in filesystems (FUSE, NFS, CIFS, CEPH, 9p) that eCryptfs isn't known to support today. https://bugs.launchpad.net/ecryptfs/+bug/641703 Reported-by: Kevin Buhr Signed-off-by: Tyler Hicks Signed-off-by: Greg Kroah-Hartman --- fs/ecryptfs/inode.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs/ecryptfs') diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 585987ce4e8..b582f09a901 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -69,15 +69,19 @@ ecryptfs_create_underlying_file(struct inode *lower_dir_inode, struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); struct dentry *dentry_save; struct vfsmount *vfsmount_save; + unsigned int flags_save; int rc; dentry_save = nd->path.dentry; vfsmount_save = nd->path.mnt; + flags_save = nd->flags; nd->path.dentry = lower_dentry; nd->path.mnt = lower_mnt; + nd->flags &= ~LOOKUP_OPEN; rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); nd->path.dentry = dentry_save; nd->path.mnt = vfsmount_save; + nd->flags = flags_save; return rc; } -- cgit v1.2.3-18-g5258