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authorTyler Hicks <tyhicks@linux.vnet.ibm.com>2010-09-23 02:35:04 -0500
committerTyler Hicks <tyhicks@linux.vnet.ibm.com>2010-10-29 10:31:35 -0500
commit2e21b3f124eceb6ab5a07c8a061adce14ac94e14 (patch)
tree0997d7430d83a976b5e7ff0e2201032a45ccb759 /fs/ecryptfs
parent48b512e6857139393cdfce26348c362b87537018 (diff)
downloadlinux-2e21b3f124eceb6ab5a07c8a061adce14ac94e14.tar.bz2
eCryptfs: Clear LOOKUP_OPEN flag when creating lower file
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 Cc: stable <stable@kernel.org> Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Diffstat (limited to 'fs/ecryptfs')
-rw-r--r--fs/ecryptfs/inode.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 63e6ec0e8b50..9d1a22d62765 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -71,15 +71,19 @@ 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;
}