Spuisofs
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Introduction
- spuisofs is a Linux virtual filesystem which allows you to execute isolated SPU modules from user-space.
- spuisofs can execute only isolated SPU modules which are decrypted by isoldr.
- I used this driver e.g. to dump my EID0 key and my ATA keys.
Mounting
glevand@debian:~$ sudo mount -t spuisofs none /mnt
Filesystem Layout
glevand@debian:~$ ls -l /mnt total 0 -rw-rw-rw- 1 root root 1048576 Aug 16 11:10 app -rw-rw-rw- 1 root root 1048576 Aug 16 11:10 arg1 -rw-rw-rw- 1 root root 1048576 Aug 16 11:10 arg2 --w--w--w- 1 root root 0 Aug 16 11:10 cont -r--r--r-- 1 root root 0 Aug 16 11:10 info -rw-rw-rw- 1 root root 262144 Aug 16 11:10 ls -rw-rw-rw- 1 root root 131072 Aug 16 11:10 priv2 -rw-rw-rw- 1 root root 131072 Aug 16 11:10 problem --w--w--w- 1 root root 24 Aug 16 11:10 run -r--r--r-- 1 root root 4096 Aug 16 11:10 shadow glevand@debian:~$ cat /mnt/info arg1 d000000003b9d000 arg2 d000000003c9e000
Dumping EID0 Key with spuisofs
- I modified aim_spu_module.self to dump EID0 IV and key with my spuisofs.
SPU Program
Here is my SPU program to dump EID0 key and IV:
/* * Dump EID0 IV and key to EA with MFC * * Copyright (C) 2012 glevand <[email protected]> * All rights reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published * by the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ .text start: ila $2, 0x3dfa0 lr $sp, $2 ila $80, 0x3e000 lr $81, $3 stqd $7, 0($80) stqd $8, 0x10($80) # store EID0 IV stqd $9, 0x20($80) # store upper 16bytes of EID0 key stqd $10, 0x30($80) # store lower 16bytes of EID0 key stqd $11, 0x40($80) stqd $12, 0x50($80) lr $3, $80 lr $4, $81 il $5, 0x60 il $6, 0x7 il $7, 0x20 brsl $lr, 0x10 # mfc_dma_xfer il $3, 0x7 brsl $lr, 0x28 # mfc_dma_wait stop 0x666 # our evil stop code :) /* * r3 - LSA * r4 - EA * r5 - size * r6 - tag * r7 - cmd */ mfc_dma_xfer: wrch $ch16, $3 wrch $ch17, $4 shlqbyi $4, $4, 4 wrch $ch18, $4 wrch $ch19, $5 wrch $ch20, $6 wrch $ch21, $7 bi $lr /* * r3 - tag */ mfc_dma_wait: il $2, 0 nop $127 hbra 2f, 1f wrch $ch23, $2 1: rchcnt $2, $ch23 ceqi $2, $2, 1 nop $127 nop $127 nop $127 nop $127 nop $127 2: brz $2, 1b hbr 3f, $lr rdch $2, $ch24 il $2, 1 shl $2, $2, $3 wrch $ch22, $2 il $2, 2 wrch $ch23, $2 rdch $2, $ch24 nop $127 3: bi $lr
Result
[glevand@arch dump_eid0_key]$ ./dump_eid0_key ../dump_eid0_key.self ../eid0 spuisofs found at /mnt arg1 kernel virtual address d000000000722000 shadow: spe_execution_status 7 priv2: puint_mb_R 2 shadow: spe_execution_status b problem: spu_status_R 6660082 [glevand@arch dump_eid0_key]$ hexdump -C /mnt/arg1 ... Here are your EID0 key and IV At offset 0x10 is EID0 IV (16 bytes) At offset 0x20 is EID0 key (32 bytes) ...