Help with disabling _syscall

[Guest]

I'm trying to hack NOVA 3: Freedom Edition, so obviously, being gameloft, they added in _syscall. I've attempted to remove it before but all that happens is that the app would freeze or crash. Here is what I NOP'ed:

 

 

__text:0055F054                 MOV             SP, R4

__text:0055F056                 VST1.64         {D8-D11}, [R4@128]!

__text:0055F05A                 VST1.64         {D12-D15}, [R4@128]

__text:0055F05E                 SUB.W           SP, SP, #0x250

__text:0055F062                 MOV             R10, R0

__text:0055F064                 MOV             R0, #(___stack_chk_guard_ptr - 0x55F072)

__text:0055F06C                 MOV             R8, R1

__text:0055F06E                 ADD             R0, PC ; ___stack_chk_guard_ptr

__text:0055F070                 MOVS            R5, #0

__text:0055F072                 MOVS            R1, #0x1F

__text:0055F074                 MOVS            R2, #0

__text:0055F076                 LDR             R6, [R0] ; ___stack_chk_guard

__text:0055F078                 MOVS            R3, #0

__text:0055F07A                 LDR             R0, [R6]

__text:0055F07C                 STR             R0, [sP,#0x24C]

__text:0055F07E                 MOVS            R0, #0x1A

__text:0055F080                 STR             R5, [sP]

__text:0055F082                 BLX             _syscall

__text:0055F086                 ADD             R4, SP, #0x24

__text:0055F088                 MOV.W           R0, #0x1EC

__text:0055F08C                 STR             R0, [sP,#0x210]

__text:0055F08E                 MOVS            R1, #0

__text:0055F090                 MOV             R0, R4

__text:0055F092                 MOV.W           R2, #0x1EC

__text:0055F096                 BLX             _memset

__text:0055F09A                 MOVS            R0, #1

__text:0055F09C                 MOVS            R1, #0xE

__text:0055F09E                 STR             R0, [sP,#0x14]

__text:0055F0A0                 STR             R1, [sP,#0x18]

__text:0055F0A2                 STR             R0, [sP,#0x1C]

__text:0055F0A4                 BLX             _getpid

__text:0055F0A8                 STR             R0, [sP,#0x20]

__text:0055F0AA                 ADD             R0, SP, #0x14

__text:0055F0AC                 ADD             R3, SP, #0x210

__text:0055F0AE                 MOVS            R1, #4

__text:0055F0B0                 MOV             R2, R4

__text:0055F0B2                 STR             R5, [sP]

__text:0055F0B4                 STR             R5, [sP,#4]

__text:0055F0B6                 BLX             _sysctl

__text:0055F0BA                 MOV             R4, R0

 

After I NOP'ed that the app would crash upon startup. I then NOP'ed:

 

__text:0055F054                 MOV             SP, R4

__text:0055F056                 VST1.64         {D8-D11}, [R4@128]!

__text:0055F05A                 VST1.64         {D12-D15}, [R4@128]

__text:0055F05E                 SUB.W           SP, SP, #0x250

__text:0055F062                 MOV             R10, R0

__text:0055F064                 MOV             R0, #(___stack_chk_guard_ptr - 0x55F072)

__text:0055F06C                 MOV             R8, R1

__text:0055F06E                 ADD             R0, PC ; ___stack_chk_guard_ptr

__text:0055F070                 MOVS            R5, #0

__text:0055F072                 MOVS            R1, #0x1F

__text:0055F074                 MOVS            R2, #0

__text:0055F076                 LDR             R6, [R0] ; ___stack_chk_guard

__text:0055F078                 MOVS            R3, #0

__text:0055F07A                 LDR             R0, [R6]

__text:0055F07C                 STR             R0, [sP,#0x24C]

__text:0055F07E                 MOVS            R0, #0x1A

__text:0055F080                 STR             R5, [sP]

__text:0055F082                 BLX             _syscall

__text:0055F086                 ADD             R4, SP, #0x24

__text:0055F088                 MOV.W           R0, #0x1EC

__text:0055F08C                 STR             R0, [sP,#0x210]

__text:0055F08E                 MOVS            R1, #0

__text:0055F090                 MOV             R0, R4

__text:0055F092                 MOV.W           R2, #0x1EC

__text:0055F096                 BLX             _memset

__text:0055F09A                 MOVS            R0, #1

__text:0055F09C                 MOVS            R1, #0xE

__text:0055F09E                 STR             R0, [sP,#0x14]

__text:0055F0A0                 STR             R1, [sP,#0x18]

__text:0055F0A2                 STR             R0, [sP,#0x1C]

__text:0055F0A4                 BLX             _getpid

__text:0055F0A8                 STR             R0, [sP,#0x20]

__text:0055F0AA                 ADD             R0, SP, #0x14

__text:0055F0AC                 ADD             R3, SP, #0x210

__text:0055F0AE                 MOVS            R1, #4

__text:0055F0B0                 MOV             R2, R4

__text:0055F0B2                 STR             R5, [sP]

__text:0055F0B4                 STR             R5, [sP,#4]

__text:0055F0B6                 BLX             _sysctl

__text:0055F0BA                 MOV             R4, R0

 

Again, same thing. It would crash. So the last thing I did was I changed 

 

__text:0055F072                 MOVS            R1, #0x1F

 

to

 

__text:0055F072                 MOVS            R1, #0x0

 

and the app did not crash this time, it only froze right at the gameloft logo. So I tried to attach it to GDB, because it is technically running if it is frozen, and it gave me segmentation fault: 11. Please, if any of you could help me solve this problem, I would be so happy, its been driving me crazy since the new year

 

Thanks!

Updated January 15, 2015 by Guest

[sn0wqt 42.6k iPhone X 13.3]

 

I'm trying to hack NOVA 3: Freedom Edition, so obviously, being gameloft, they added in _syscall. I've attempted to remove it before but all that happens is that the app would freeze or crash. Here is what I NOP'ed:

 

 

__text:0055F054                 MOV             SP, R4

__text:0055F056                 VST1.64         {D8-D11}, [R4@128]!

__text:0055F05A                 VST1.64         {D12-D15}, [R4@128]

__text:0055F05E                 SUB.W           SP, SP, #0x250

__text:0055F062                 MOV             R10, R0

__text:0055F064                 MOV             R0, #(___stack_chk_guard_ptr - 0x55F072)

__text:0055F06C                 MOV             R8, R1

__text:0055F06E                 ADD             R0, PC ; ___stack_chk_guard_ptr

__text:0055F070                 MOVS            R5, #0

__text:0055F072                 MOVS            R1, #0x1F

__text:0055F074                 MOVS            R2, #0

__text:0055F076                 LDR             R6, [R0] ; ___stack_chk_guard

__text:0055F078                 MOVS            R3, #0

__text:0055F07A                 LDR             R0, [R6]

__text:0055F07C                 STR             R0, [sP,#0x24C]

__text:0055F07E                 MOVS            R0, #0x1A

__text:0055F080                 STR             R5, [sP]

__text:0055F082                 BLX             _syscall

__text:0055F086                 ADD             R4, SP, #0x24

__text:0055F088                 MOV.W           R0, #0x1EC

__text:0055F08C                 STR             R0, [sP,#0x210]

__text:0055F08E                 MOVS            R1, #0

__text:0055F090                 MOV             R0, R4

__text:0055F092                 MOV.W           R2, #0x1EC

__text:0055F096                 BLX             _memset

__text:0055F09A                 MOVS            R0, #1

__text:0055F09C                 MOVS            R1, #0xE

__text:0055F09E                 STR             R0, [sP,#0x14]

__text:0055F0A0                 STR             R1, [sP,#0x18]

__text:0055F0A2                 STR             R0, [sP,#0x1C]

__text:0055F0A4                 BLX             _getpid

__text:0055F0A8                 STR             R0, [sP,#0x20]

__text:0055F0AA                 ADD             R0, SP, #0x14

__text:0055F0AC                 ADD             R3, SP, #0x210

__text:0055F0AE                 MOVS            R1, #4

__text:0055F0B0                 MOV             R2, R4

__text:0055F0B2                 STR             R5, [sP]

__text:0055F0B4                 STR             R5, [sP,#4]

__text:0055F0B6                 BLX             _sysctl

__text:0055F0BA                 MOV             R4, R0

 

After I NOP'ed that the app would crash upon startup. I then NOP'ed:

 

__text:0055F054                 MOV             SP, R4

__text:0055F056                 VST1.64         {D8-D11}, [R4@128]!

__text:0055F05A                 VST1.64         {D12-D15}, [R4@128]

__text:0055F05E                 SUB.W           SP, SP, #0x250

__text:0055F062                 MOV             R10, R0

__text:0055F064                 MOV             R0, #(___stack_chk_guard_ptr - 0x55F072)

__text:0055F06C                 MOV             R8, R1

__text:0055F06E                 ADD             R0, PC ; ___stack_chk_guard_ptr

__text:0055F070                 MOVS            R5, #0

__text:0055F072                 MOVS            R1, #0x1F

__text:0055F074                 MOVS            R2, #0

__text:0055F076                 LDR             R6, [R0] ; ___stack_chk_guard

__text:0055F078                 MOVS            R3, #0

__text:0055F07A                 LDR             R0, [R6]

__text:0055F07C                 STR             R0, [sP,#0x24C]

__text:0055F07E                 MOVS            R0, #0x1A

__text:0055F080                 STR             R5, [sP]

__text:0055F082                 BLX             _syscall

__text:0055F086                 ADD             R4, SP, #0x24

__text:0055F088                 MOV.W           R0, #0x1EC

__text:0055F08C                 STR             R0, [sP,#0x210]

__text:0055F08E                 MOVS            R1, #0

__text:0055F090                 MOV             R0, R4

__text:0055F092                 MOV.W           R2, #0x1EC

__text:0055F096                 BLX             _memset

__text:0055F09A                 MOVS            R0, #1

__text:0055F09C                 MOVS            R1, #0xE

__text:0055F09E                 STR             R0, [sP,#0x14]

__text:0055F0A0                 STR             R1, [sP,#0x18]

__text:0055F0A2                 STR             R0, [sP,#0x1C]

__text:0055F0A4                 BLX             _getpid

__text:0055F0A8                 STR             R0, [sP,#0x20]

__text:0055F0AA                 ADD             R0, SP, #0x14

__text:0055F0AC                 ADD             R3, SP, #0x210

__text:0055F0AE                 MOVS            R1, #4

__text:0055F0B0                 MOV             R2, R4

__text:0055F0B2                 STR             R5, [sP]

__text:0055F0B4                 STR             R5, [sP,#4]

__text:0055F0B6                 BLX             _sysctl

__text:0055F0BA                 MOV             R4, R0

 

Again, same thing. It would crash. So the last thing I did was I changed 

 

__text:0055F072                 MOVS            R1, #0x1F

 

to

 

__text:0055F072                 MOVS            R1, #0x0

 

and the app did not crash this time, it only froze right at the gameloft logo. So I tried to attach it to GDB, because it is technically running if it is frozen, and it gave me segmentation fault: 11. Please, if any of you could help me solve this problem, I would be so happy, its been driving me crazy since the new year

 

Thanks!

 

bro GameLoft's game are not that easy lol u should learn save game hack then ms then ida then code inject  

[Guest]

bro GameLoft's game are not that easy lol u should learn save game hack then ms then ida then code inject

 

I know that already, this is one of the first forums I've signed up with. I know how to use GDB to find offsets in IDA and I know how to patch a binary. My first hack was a savegame for COD: BOZ for v1.3.3, I already learned MS, MSHook, and I'm doing IDA and code inject (writeData) right now and I'm working on Dead Trigger 2 but decided to take a break and do this because I get angry very easily lol

 

so im not really a beginner

 

@ 

@

Updated January 15, 2015 by Guest

[AnotherLurker 1.5k]

@

he already understands arm, no need to go through all that outdated crap

 

@@Shmoo419

hmmm... me and Swag had the same issue with Brothers In arms 3...

 

trying disabling calls to _dlsym

[Laxus 813.6k iPhone 5s 10.3.3]

@

he already understands arm, no need to go through all that outdated crap

 

@@Shmoo419

hmmm... me and Swag had the same issue with Brothers In arms 3...

 

trying disabling calls to _dlsym

hmm Its work for me

[AnotherLurker 1.5k]

@@Laxus

 

really?, with syscall patched? try brothers in arms 3, me and Swag had it crash on our devices

[Laxus 813.6k iPhone 5s 10.3.3]

@@Laxus

 

really?, with syscall patched? try brothers in arms 3, me and Swag had it crash on our devices

Works fine on my iP5, not sure about 64 bit devices

[CmakLove 9.7k 17]

I had the same issue with brothers in arms 3...

[Guest]

@

he already understands arm, no need to go through all that outdated crap

 

@@Shmoo419

hmmm... me and Swag had the same issue with Brothers In arms 3...

 

trying disabling calls to _dlsym

OK, I'll try that. Thanks for an answer, I'll see what happenes once I do it. But who is Swag?

 

@

Updated January 16, 2015 by Guest

[sn0wqt 42.6k iPhone X 13.3]

OK, I'll try that. Thanks for an answer, I'll see what happenes once I do it. But who is Swag?

 

@

Swag is @@Aswag1