Help/Support [IDA] Is this Function Hackable?

Ted2 · June 28, 2016

I'm here again...

Someone told me to practice with an old version of Candy Crush because this would be "easy"...

I thought this function is hackable:

I did this:

; _DWORD __fastcall CSaveData::SetNumLives(CSaveData *__hidden this, int)
EXPORT _ZN9CSaveData11SetNumLivesEi
_ZN9CSaveData11SetNumLivesEi
STMFD           SP!, {R4-R6,LR}
MOV             R4, R0
LDR             R6, [R0,#0x29C] --> LDR R6 [R7,#0x29C]
MOV             R5, R1
BL              _ZN9CSaveData14GetNumMaxLivesEv ; CSaveData::GetNumMaxLives(void)
CMP             R6, R0
BLT             loc_F4DC0

loc_F4DC0
STR             R5, [R4,#0x29C] --> STR R7, [R4,#0x29C]
LDMFD           SP!, {R4-R6,PC}
; End of function CSaveData::SetNumLives(int)

I though this would be it because the LDR function tells #0x29C and so does the STR function.

Results: after playing one level it gave me a negative number of lives...

any help?

Oxytyramine · June 28, 2016

pm me

Rook · June 28, 2016

You can mshook that.

And are you sure the lives are minus? Or is the value too large to fit on screen?

castix · June 28, 2016

Why do you ask us and don't test it?

Yes it is

Ted2 · June 28, 2016

You can mshook that.

And are you sure the lives are minus? Or is the value too large to fit on screen?

mshook on a android .so?

and yes, I am sure. I tried playing a level and it says not enough lives

Why do you ask us and don't test it?

Yes it is

I already tested it, I already told you the results so....

Rook · June 28, 2016

mshook on a android .so?

and yes, I am sure. I tried playing a level and it says not enough lives

I already tested it, I already told you the results so....

Oops