Help/Support IDA/GDB issue code inject crash ,help

[Curtain 515 31 8.1.2]

hey everybody,i need your help,please

I tried to hack Simcity via GDB/IDA .i found the offset is

0x498324  

orig:str r4, [r6, #152]

hack: str r7,[r6,#152]

as usually,i changed it to str r7,[r6,#152],   set *0x498324=E5867098

press c  enter return device make money change ,then app crash  

 

so,i tried to set $r4=oxVALUE,work now,

 

my quesion is :

1.is it possible to code inject directly like change r4 value ? if it is possible ,how to do.

2.why r4 to r7 will crash.

 

Hardware watchpoint 3: *257995816

Old value = 30
New value = 29
0x00498324 in g_s3e_code ()
3: x/i $pc 0x498324: 98 40 86 e5 str r4, [r6, #152]
2: $r0 = 484640170
1: x/i $pc 0x498324: 98 40 86 e5 str r4, [r6, #152]
(gdb) info r
r0 0x1ce305aa 484640170
r1 0xc6ef3720 -957401312
r2 0x88c110 8962320
r3 0x0 0
r4 0x1d 29
r5 0x88c118 8962328
r6 0xf60b390 257995664
r7 0x1 1
r8 0x6ce500cb 1826947275
r9 0x52ae977f 1387173759
r10 0x30317681 808547969
r11 0x0 0
r12 0x0 0
sp 0x52d1ab8 86842040
lr 0x4982d4 4817620
pc 0x498324 4817700
cpsr 0x280d0010 671940624
(gdb) set $r4=0x999999
warning: Unrecognized osabi 0 in arm_set_osabi_from_host_info
(gdb) c
Continuing.
warning: Unrecognized osabi 0 in arm_set_osabi_from_host_info
warning: Unrecognized osabi 0 in arm_set_osabi_from_host_info
Hardware watchpoint 3: *257995816

Old value = 29
New value = 10066329  
0x00498324 in g_s3e_code ()
3: x/i $pc 0x498324: 98 40 86 e5 str r4, [r6, #152]
2: $r0 = 484640170
1: x/i $pc 0x498324: 98 40 86 e5 str r4, [r6, #152]
(gdb) c
Continuing.
game running image

 

symbolstub1:004982AC ; ---------------------------------------------------------------------------
__symbolstub1:004982AC
__symbolstub1:004982AC loc_4982AC ; CODE XREF: sub_49828C+14j
__symbolstub1:004982AC ADD R4, R0, #0xA0
__symbolstub1:004982B0 ADD R5, R0, #0x98
__symbolstub1:004982B4 MOV R0, R5
__symbolstub1:004982B8 MOV R1, R4
__symbolstub1:004982BC BL loc_496AC4
__symbolstub1:004982C0 CMP R0, R7
__symbolstub1:004982C4 BCC loc_4982A4
__symbolstub1:004982C8 MOV R0, R5
__symbolstub1:004982CC MOV R1, R4
__symbolstub1:004982D0 BL loc_496AC4
__symbolstub1:004982D4 LDR R5, =0x3F3E38
__symbolstub1:004982D8 ADD R5, PC, R5
__symbolstub1:004982DC LDR R10, [R5]
__symbolstub1:004982E0 CMP R10, #0
__symbolstub1:004982E4 RSB R4, R7, R0
__symbolstub1:004982E8 BNE loc_4982F4
__symbolstub1:004982EC BL sub_3C39EC
__symbolstub1:004982F0 LDR R10, [R5]
__symbolstub1:004982F4
__symbolstub1:004982F4 loc_4982F4 ; CODE XREF: sub_49828C+5Cj
__symbolstub1:004982F4 LDR R1, =0x3F3E0C
__symbolstub1:004982F8 LDR R2, =0x3F3E04
__symbolstub1:004982FC LDR R3, =0x3F3DFC
__symbolstub1:00498300 ADD R1, PC, R1
__symbolstub1:00498304 ADD R2, PC, R2
__symbolstub1:00498308 ADD R3, PC, R3
__symbolstub1:0049830C LDR R9, [R1]
__symbolstub1:00498310 MOV R12, #0
__symbolstub1:00498314 LDR R8, [R2]
__symbolstub1:00498318 LDR R1, =0xC6EF3720
__symbolstub1:0049831C LDR R0, [R3]
__symbolstub1:00498320 MOV R3, R12
__symbolstub1:00498324 STR R4, [R6,#0x98]
__symbolstub1:00498328
__symbolstub1:00498328 loc_498328 ; CODE XREF: sub_49828C+E0j
__symbolstub1:00498328 ADD R3, R3, #0x9E000000
__symbolstub1:0049832C ADD R3, R3, #0x374000
__symbolstub1:00498330 ADD R3, R3, #0x3980
__symbolstub1:00498334 ADD R3, R3, #0x39
__symbolstub1:00498338 ADD R11, R10, R12,LSL#4
__symbolstub1:0049833C ADD R2, R9, R12,LSR#5
__symbolstub1:00498340 ADD R5, R12, R3
__symbolstub1:00498344 EOR R2, R11, R2
__symbolstub1:00498348 EOR R2, R2, R5
__symbolstub1:0049834C ADD R4, R4, R2
__symbolstub1:00498350 ADD R5, R4, R3
__symbolstub1:00498354 ADD R11, R8, R4,LSL#4
__symbolstub1:00498358 ADD R2, R0, R4,LSR#5
__symbolstub1:0049835C EOR R2, R11, R2
__symbolstub1:00498360 EOR R2, R2, R5
__symbolstub1:00498364 CMP R3, R1
__symbolstub1:00498368 ADD R12, R12, R2
__symbolstub1:0049836C BNE loc_498328
__symbolstub1:00498370 MOV R2, #0
__symbolstub1:00498374 LDR R1, [R6,#0xBC]
__symbolstub1:00498378 ORR R2, R2, R12
__symbolstub1:0049837C MOV R3, R4
__symbolstub1:00498380 CMP R1, #0
__symbolstub1:00498384 STRD R2, [R6,#0xA0]
__symbolstub1:00498388 BEQ loc_4982A4
__symbolstub1:0049838C CMP R7, R1
__symbolstub1:00498390 MOVCS R7, R1
__symbolstub1:00498394 MOV R0, R7
__symbolstub1:00498398 RSB R7, R7, R1
__symbolstub1:0049839C STR R7, [R6,#0xBC]
__symbolstub1:004983A0 LDMFD SP!, {R3-R11,PC}
__symbolstub1:004983A0 ; End of function sub_49828C
__symbolstub1:004983A0
__symbolstub1:004983A0 ; 

Updated April 18, 2015 by zzmutu

[sn0wqt 42.5k iPhone X 13.3]

Why u hided the topic...

[DeadGood 5.3k 25 8.3.0]

Hided?

 

[Curtain 515 31 8.1.2]

Why u hided the topic...

 

Hided?

i am sorry.it is my mistake

[sn0wqt 42.5k iPhone X 13.3]

Did u try set $r4=$r7 wothout 0x dude 0x is for when u set it to a new hex like set *0xoffset=0xhex

Or try set $r4=99999

[Curtain 515 31 8.1.2]

Did u try set $r4=$r7 wothout 0x dude 0x is for when u set it to a new hex like set *0xoffset=0xhex

Or try set $r4=99999

i set $r4=0x99999 only 

 

whether "$r4=0x999" or "$r4=$r7"

how converted to just like [0xoffset,0xhex]

in this way ,make a patcher.

[sn0wqt 42.5k iPhone X 13.3]

Can u talk more specific bro?

[sn0wqt 42.5k iPhone X 13.3]

U mean u want to make it a tweak or a patcher?

[Curtain 515 31 8.1.2]

U mean u want to make it a tweak or a patcher?

yes,i think so 

 

because i learned code inject tut from DIDA/airmax  etc

 

they always found offset /funtion/data

 

then done such as :

 

offset:0xaddress

 

STR R4, [R6,#0x98] ----------->STR  R7, [R6,#0x98]

 

tweak like this:writeData(0xoffset, 0xhex)

 

because once run ,app will crash

_________________​_________________​_________________

if i want to change register value,(set $r4=0xhex  or set $r4=$r7) 

 

which is my offset and hex for make a patcher.

 

 

 

 

 

i am so sorry for pool english.

[sn0wqt 42.5k iPhone X 13.3]

Can u gimme the offsets and the hex in settings i will fix it for you