binary bomb

[Lina]

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

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

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

[Tonto]

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

[zx-1]

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.

[psychopath]

Doesn't this violate the homework policy?

[valis]

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

[zx-1]

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.

[Frobozz]

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.