eCryptfs: don't pass fs-specific ioctl commands through

commit 6d65261a upstream.

eCryptfs can't be aware of what to expect when after passing an
arbitrary ioctl command through to the lower filesystem. The ioctl
command may trigger an action in the lower filesystem that is
incompatible with eCryptfs.

One specific example is when one attempts to use the Btrfs clone
ioctl command when the source file is in the Btrfs filesystem that
eCryptfs is mounted on top of and the destination fd is from a new file
created in the eCryptfs mount. The ioctl syscall incorrectly returns
success because the command is passed down to Btrfs which thinks that it
was able to do the clone operation. However, the result is an empty
eCryptfs file.

This patch allows the trim, {g,s}etflags, and {g,s}etversion ioctl
commands through and then copies up the inode metadata from the lower
inode to the eCryptfs inode to catch any changes made to the lower
inode's metadata. Those five ioctl commands are mostly common across all
filesystems but the whitelist may need to be further pruned in the
future.

https://bugzilla.kernel.org/show_bug.cgi?id=93691
https://launchpad.net/bugs/1305335Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Cc: Rocko <rockorequin@hotmail.com>
Cc: Colin Ian King <colin.king@canonical.com>
[bwh: Backported to 3.2:
 - Adjust context
 - We don't have file_inode() so open-code the inode lookup]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

fs/ecryptfs/file.c

@@ -307,9 +307,23 @@ ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 	if (ecryptfs_file_to_private(file))
 		lower_file = ecryptfs_file_to_lower(file);
-	if (lower_file && lower_file->f_op && lower_file->f_op->unlocked_ioctl)
+	if (!(lower_file && lower_file->f_op && lower_file->f_op->unlocked_ioctl))
+		return rc;
+
+	switch (cmd) {
+	case FITRIM:
+	case FS_IOC_GETFLAGS:
+	case FS_IOC_SETFLAGS:
+	case FS_IOC_GETVERSION:
+	case FS_IOC_SETVERSION:
 		rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
-	return rc;
+		fsstack_copy_attr_all(file->f_path.dentry->d_inode,
+				      lower_file->f_path.dentry->d_inode);
+
+		return rc;
+	default:
+		return rc;
+	}
 }
 
 #ifdef CONFIG_COMPAT
@@ -321,9 +335,23 @@ ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 	if (ecryptfs_file_to_private(file))
 		lower_file = ecryptfs_file_to_lower(file);
-	if (lower_file && lower_file->f_op && lower_file->f_op->compat_ioctl)
+	if (!(lower_file && lower_file->f_op && lower_file->f_op->compat_ioctl))
+		return rc;
+
+	switch (cmd) {
+	case FITRIM:
+	case FS_IOC32_GETFLAGS:
+	case FS_IOC32_SETFLAGS:
+	case FS_IOC32_GETVERSION:
+	case FS_IOC32_SETVERSION:
 		rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
-	return rc;
+		fsstack_copy_attr_all(file->f_path.dentry->d_inode,
+				      lower_file->f_path.dentry->d_inode);
+
+		return rc;
+	default:
+		return rc;
+	}
 }
 #endif