eCryptfs: Copy up POSIX ACL and read-only flags from lower mount

When the eCryptfs mount options do not include '-o acl', but the lower
filesystem's mount options do include 'acl', the MS_POSIXACL flag is not
flipped on in the eCryptfs super block flags. This flag is what the VFS
checks in do_last() when deciding if the current umask should be applied
to a newly created inode's mode or not. When a default POSIX ACL mask is
set on a directory, the current umask is incorrectly applied to new
inodes created in the directory. This patch ignores the MS_POSIXACL flag
passed into ecryptfs_mount() and sets the flag on the eCryptfs super
block depending on the flag's presence on the lower super block.

Additionally, it is incorrect to allow a writeable eCryptfs mount on top
of a read-only lower mount. This missing check did not allow writes to
the read-only lower mount because permissions checks are still performed
on the lower filesystem's objects but it is best to simply not allow a
rw mount on top of ro mount. However, a ro eCryptfs mount on top of a rw
mount is valid and still allowed.

https://launchpad.net/bugs/1009207

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Reported-by: Stefan Beller <stefanbeller@googlemail.com>
Cc: John Johansen <john.johansen@canonical.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 68954937a071..df217dc9f1d9 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -505,7 +505,6 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
                 goto out;
         }
 
-        s->s_flags = flags;
         rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs", BDI_CAP_MAP_COPY);
         if (rc)
                 goto out1;
@@ -541,6 +540,15 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
         }
 
         ecryptfs_set_superblock_lower(s, path.dentry->d_sb);
+
+        /**
+         * Set the POSIX ACL flag based on whether they're enabled in the lower
+         * mount. Force a read-only eCryptfs mount if the lower mount is ro.
+         * Allow a ro eCryptfs mount even when the lower mount is rw.
+         */
+        s->s_flags = flags & ~MS_POSIXACL;
+        s->s_flags |= path.dentry->d_sb->s_flags & (MS_RDONLY | MS_POSIXACL);
+
         s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
         s->s_blocksize = path.dentry->d_sb->s_blocksize;
         s->s_magic = ECRYPTFS_SUPER_MAGIC;