Help/Support GDB Error: Segmentation fault: 11

[TheChief 351 iPad Pro 12.9" 10.3.3]

What I do after that ....

 

Read the tutorials in the Tutorials section. If you need help with something in it. Open a new topic in Help & Support section.

[Curtain 519 31 8.1.2]

@@DiDA

i got address "0x31b68e78" of ptrace follow your way.and i load binary to IDA,then i try to search for it.but there isnt the address which i found.any ideas ?

 

 

 

"Breakpoint 1 at 0x31b68e78

Pending breakpoint 1 - "ptrace" resolved

warning: Unrecognized osabi 0 in arm_set_osabi_from_host_info"

[Rook 561.3k iPad Pro (2nd gen) 17.4 Donor]

@@DiDA

i got address "0x31b68e78" of ptrace follow your way.and i load binary to IDA,then i try to search for it.but there isnt the address which i found.any ideas ?

 

 

 

"Breakpoint 1 at 0x31b68e78

Pending breakpoint 1 - "ptrace" resolved

warning: Unrecognized osabi 0 in arm_set_osabi_from_host_info"

Search for ptrace/syscall/sysctl and xref it to see how many there are.

 

If the app has sysctl, look for the one with memset, getpid near it and if you see a MOVS R1, #0x1F, NOP it.

[Curtain 519 31 8.1.2]

Search for ptrace/syscall/sysctl and xref it to see how many there are.

 

If the app has sysctl, look for the one with memset, getpid near it and if you see a MOVS R1, #0x1F, NOP it.

i`ve found this,but without "MOVS R1, #0x1F",

and is it must me the same as "MOVS R1, #0x1F"

 

 

ADD             R7, SP, #0xC

STMFD           SP!, {R8,R10}

SUB             SP, SP, #0x20C

BIC             SP, SP, #7

MOV             R5, R1

MOV             R1, #0x1EC------->is this correct one??

MOV             R6, R0

STR             R1, [sP,#0x220+var_28]

MOV             R0, R5  ; void *

MOV             R1, #0  ; int

MOV             R4, R2

BL              _memset

MOV             R0, #1

MOV             R1, #0xE

STR             R0, [sP,#0x220+var_24]

MOV             R8, #0

STR             R1, [sP,#0x220+var_20]

MOV             R1, #4  ; u_int

STR             R0, [sP,#0x220+var_1C]

ADD             R0, SP, #0x220+var_24 ; int *

STR             R6, [sP,#0x220+var_18]

ADD             R6, SP, #0x220+var_218

ADD             R3, SP, #0x220+var_28 ; size_t *

STR             R8, [sP,#0x220+var_220] ; void *

MOV             R2, R6  ; void *

STR             R8, [sP,#0x220+var_21C] ; size_t

BL              _sysctl

CMP             R0, #0

BLT             loc_19531E4

Updated May 13, 2015 by zzmutu

[Curtain 519 31 8.1.2]

i found MOVS            R1, #0x1F      app crashed when i changed to whatever values or nop it .any ideas ?

__text:00F36D08                 PUSH            {R4-R7,LR}

__text:00F36D0A                 ADD             R7, SP, #0xC

__text:00F36D0C                 PUSH.W          {R8,R10}

__text:00F36D10                 SUB.W           SP, SP, #0x20C

__text:00F36D14                 MOV             R5, R0

__text:00F36D16                 MOV             R0, #(___stack_chk_guard_ptr - 0xF36D24)

__text:00F36D1E                 MOV             R10, R1

__text:00F36D20                 ADD             R0, PC ; ___stack_chk_guard_ptr

__text:00F36D22                 MOVS            R4, #0

__text:00F36D24                 MOVS            R1, #0x1F     nop or changed to any values different 

__text:00F36D26                 MOVS            R2, #0

__text:00F36D28                 LDR.W           R8, [R0] ; ___stack_chk_guard

__text:00F36D2C                 MOVS            R3, #0

__text:00F36D2E                 LDR.W           R0, [R8]

__text:00F36D32                 STR             R0, [sP,#0x220+var_18]

__text:00F36D34                 MOVS            R0, #0x1A ; int

__text:00F36D36                 STR             R4, [sP,#0x220+var_220]

__text:00F36D38                 BLX             _syscall

__text:00F36D3C                 ADD             R6, SP, #0x220+var_204

__text:00F36D3E                 MOV.W           R0, #0x1EC

__text:00F36D42                 STR             R0, [sP,#0x220+var_218]

__text:00F36D44                 MOVS            R1, #0  ; int

__text:00F36D46                 MOV             R0, R6  ; void *

__text:00F36D48                 MOV.W           R2, #0x1EC ; size_t

__text:00F36D4C                 BLX             _memset

__text:00F36D50                 MOVS            R0, #1

__text:00F36D52                 MOVS            R1, #0xE

__text:00F36D54                 STR             R0, [sP,#0x220+var_214]

__text:00F36D56                 STR             R1, [sP,#0x220+var_210]

__text:00F36D58                 STR             R0, [sP,#0x220+var_20C]

__text:00F36D5A                 BLX             _getpid

__text:00F36D5E                 STR             R0, [sP,#0x220+var_208]

__text:00F36D60                 ADD             R0, SP, #0x220+var_214 ; int *

__text:00F36D62                 ADD             R3, SP, #0x220+var_218 ; size_t *

__text:00F36D64                 MOVS            R1, #4  ; u_int

__text:00F36D66                 MOV             R2, R6  ; void *

__text:00F36D68                 STR             R4, [sP,#0x220+var_220] ; void *

__text:00F36D6A                 STR             R4, [sP,#0x220+var_21C] ; size_t

__text:00F36D6C                 BLX             _sysctl

__text:00F36D70                 CMP             R0, #0

 

 

[3r0rfadeness 0 30]

When I do this with bloons monkey city i get to the run part and it says no executable file specified

[sisky_the_sheep 0 11]

Hello DiDa, nice tut! I am currently trying this on my jailbroken iphone (iphone5 with iOS 8.0.2), and when i type run to start the process, my app gets killed.

 

photo with the error

[Goran 1.9k]

On 11/23/2014 at 1:13 AM, DiDA said:

World At Arms has Anti-Debugging Protection (ptrace)

 

You need to disable ptrace in order to debug the process. Disable ptrace by doing this:

 

Open Terminal and type in:

gdb /User/Containers/Bundle/Application/xxxxxx-xxxx-xxx-xxx-xxxxxx/MCT.app/MCT

Then:

break ptrace

Then:

run

Terminal will show you the Offset. Go to the offset in IDA and NOP ptrace and then attach MCT again normally.

 

More info: http://www.coredump.gr/articles/ios-anti-debugging-protections-part-1/

 

Tutorial by shmoo: https://iosgods.com/topic/26721-breaking-securityhow-to-disable-syscall-anti-debugging-protection/

is it same command for LLDB??? and is there some option in ida pro to remove that permanet....?

[Mr_BigBoss 541 iPhone Xs Max 14.6]

Hi there,

 

I did break ptrace on Terminal for the game Dynasty Blades, it said invalid command?

[mmss0909 2 iPhone 7 Plus 14.2]

E