binary bomb

i'm working on the binary bomb assignment, i've defused phase_1 bomb , but not phase_2.

Please help me on doing so

this following is the disassmbled code using objdump

Code:

08048b80 <phase_2>: 8048b80: 55 push %ebp 8048b81: 89 e5 mov %esp,%ebp 8048b83: 56 push %esi 8048b84: 53 push %ebx 8048b85: 83 ec 30 sub $0x30,%esp 8048b88: be 00 00 00 00 mov $0x0,%esi 8048b8d: 8d 45 d8 lea 0xffffffd8(%ebp),%eax 8048b90: 89 44 24 04 mov %eax,0x4(%esp) 8048b94: 8b 45 08 mov 0x8(%ebp),%eax 8048b97: 89 04 24 mov %eax,(%esp) 8048b9a: e8 d5 03 00 00 call 8048f74 <read_six_numbers> 8048b9f: bb 00 00 00 00 mov $0x0,%ebx 8048ba4: 8b 44 9d d8 mov 0xffffffd8(%ebp,%ebx,4),%eax 8048ba8: 3b 44 9d e4 cmp 0xffffffe4(%ebp,%ebx,4),%eax 8048bac: 74 05 je 8048bb3 <phase_2+0x33> 8048bae: e8 f2 07 00 00 call 80493a5 <explode_bomb> 8048bb3: 03 74 9d d8 add 0xffffffd8(%ebp,%ebx,4),%esi 8048bb7: 43 inc %ebx 8048bb8: 83 fb 02 cmp $0x2,%ebx 8048bbb: 7e e7 jle 8048ba4 <phase_2+0x24> 8048bbd: 85 f6 test %esi,%esi 8048bbf: 75 05 jne 8048bc6 <phase_2+0x46> 8048bc1: e8 df 07 00 00 call 80493a5 <explode_bomb> 8048bc6: 83 c4 30 add $0x30,%esp 8048bc9: 5b pop %ebx 8048bca: 5e pop %esi 8048bcb: 5d pop %ebp 8048bcc: c3 ret

and the following using gdb

Code:

08048b80 <phase_2>: 8048b80: 55 push %ebp 8048b81: 89 e5 mov %esp,%ebp 8048b83: 56 push %esi 8048b84: 53 push %ebx 8048b85: 83 ec 30 sub $0x30,%esp 8048b88: be 00 00 00 00 mov $0x0,%esi 8048b8d: 8d 45 d8 lea 0xffffffd8(%ebp),%eax 8048b90: 89 44 24 04 mov %eax,0x4(%esp) 8048b94: 8b 45 08 mov 0x8(%ebp),%eax 8048b97: 89 04 24 mov %eax,(%esp) 8048b9a: e8 d5 03 00 00 call 8048f74 <read_six_numbers> 8048b9f: bb 00 00 00 00 mov $0x0,%ebx 8048ba4: 8b 44 9d d8 mov 0xffffffd8(%ebp,%ebx,4),%eax 8048ba8: 3b 44 9d e4 cmp 0xffffffe4(%ebp,%ebx,4),%eax 8048bac: 74 05 je 8048bb3 <phase_2+0x33> 8048bae: e8 f2 07 00 00 call 80493a5 <explode_bomb> 8048bb3: 03 74 9d d8 add 0xffffffd8(%ebp,%ebx,4),%esi 8048bb7: 43 inc %ebx 8048bb8: 83 fb 02 cmp $0x2,%ebx 8048bbb: 7e e7 jle 8048ba4 <phase_2+0x24> 8048bbd: 85 f6 test %esi,%esi 8048bbf: 75 05 jne 8048bc6 <phase_2+0x46> 8048bc1: e8 df 07 00 00 call 80493a5 <explode_bomb> 8048bc6: 83 c4 30 add $0x30,%esp 8048bc9: 5b pop %ebx 8048bca: 5e pop %esi 8048bcb: 5d pop %ebp 8048bcc: c3 ret

Hey, it's exactly the same. Maybe you should provide more details.

What the OP is talking about: http://www.cs.rochester.edu/~scott/2...ments/A2.shtml

As this appears to have more to do with assembly-level debugging than C, I /r/ a move to Tech Board.

Doesn't this violate the homework policy?

Why don't you just replace all calls to explode_bomb with a call to the defuse function?

Quote:

Originally Posted by valis

Why don't you just replace all calls to explode_bomb with a call to the defuse function?

Read the link I posted. You're supposed to defuse the bomb by inputting passwords.

I can't quite make up mind about this assignment though, because you could construe it as cracker-training. It's certainly walking the thin line of blasphemy. I'll leave it to the Mods to decide the legitimacy, though.

I don't see how this could be considered any more cracker training than learning VBScript. Especially if a university is teaching the class. But yeah this definately would constitute a homework assignment. :p