GrahamCobb

#!/bin/sh -x
# Reproduce btrfs receive exposure of files outside path
# Background: assume two clients Alice and Mallory are using btrfs send to
# send snapshots to a single server for backup. Each client has their
# own directory on the server and the server always receives into a path
# starting at their own directory. This script demostrates that Mallory can
# get access to Alice's files if he knows Alice's subvolume UUID.

CHROOT="-C"

GrahamCobb

...lots of stats removed...

2016/07/15 04:44:33 
Transferred:   18.702 GBytes (877.377 kBytes/s)
Errors:                11
Checks:                 1
Transferred:           48
Elapsed time:  6h12m30.7s
Transferring:
 *                       DARsystemFull.4.dar.gpg: 59% done. avg:  275.5, cur:   68.4 kByte/s. ETA: 2h26m4s

GrahamCobb

Offset	Size				Content
------  -----   ----------------------------------  Header Block, Size 0x1004 (4100) bytes ---------------------------------------------
0x0000	2 byte	0x1701			Constant.
0x0000	126 byte			All Nulls.Constant
------  -----   ----------------------------------  This next part is rewritten when playback completes/pauses
                                                    It seems to contain information about the recording 
0x0080	string	254 byte max		Recording file path e.g. "/media/sda1/My Video/" (not needed when creating hmt)
0x017F	string	256 byte max		Recording  date-extended file name e.g. "The One Show_21010816_1817"
0x0280	4 byte	0x11223344		Recording start time (Epoch format)
0x0284	4 byte	0x11223344		Recording end   time (Epoch format)