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7.0

diffusing a bomb

Asked by errang in Assembly Programming Language, C Programming Language

Tags: bomb, assembly, diffuse

hey, I need to diffuse a "bomb", I was hoping I could get some advice, I have a vague idea of what I need to do.

080519c4 <phase_1>:
80519c4:      55       push %ebp
80519c5:      89 e5      mov %esp,%ebp
80519c7:      83 ec 10       sub $0x10,%esp
80519ca:      68 58 28 05 08       push $0x8052858
80519cf:      ff 75 08       pushl 0x8(%ebp)
80519d2:      e8 d0 03 00 00       call 8051da7 <strings_not_equal>
80519d7:      83 c4 10       add $0x10,%esp
80519da:      85 c0      test %eax,%eax
80519dc:      74 05      je 80519e3 <phase_1+0x1f>
80519de:      e8 c9 07 00 00       call 80521ac <explode_bomb>
80519e3:      c9       leave
80519e4:      c3       ret

08051da7 <strings_not_equal>:
8051da7:      55       push %ebp
8051da8:      89 e5      mov %esp,%ebp
8051daa:      57       push %edi
8051dab:      56       push %esi
8051dac:      53       push %ebx
8051dad:      8b 75 08       mov 0x8(%ebp),%esi
8051db0:      8b 7d 0c       mov 0xc(%ebp),%edi
8051db3:      56       push %esi
8051db4:      e8 d8 ff ff ff       call 8051d91 <string_length>
8051db9:      89 c3      mov %eax,%ebx
8051dbb:      57       push %edi
8051dbc:      e8 d0 ff ff ff       call 8051d91 <string_length>
8051dc1:      83 c4 08       add $0x8,%esp
8051dc4:      ba 01 00 00 00       mov $0x1,%edx
8051dc9:      39 c3      cmp %eax,%ebx
8051dcb:      75 24      jne 8051df1 <strings_not_equal+0x4a>
8051dcd:      eb 07      jmp 8051dd6 <strings_not_equal+0x2f>
8051dcf:      ba 01 00 00 00       mov $0x1,%edx
8051dd4:      eb 1b      jmp 8051df1 <strings_not_equal+0x4a>
8051dd6:      89 f2      mov %esi,%edx
8051dd8:      89 f9      mov %edi,%ecx
8051dda:      80 3e 00       cmpb $0x0,(%esi)
8051ddd:      74 0d      je 8051dec <strings_not_equal+0x45>
8051ddf:      8a 02      mov (%edx),%al
8051de1:      3a 01      cmp (%ecx),%al
8051de3:      75 ea      jne 8051dcf <strings_not_equal+0x28>
8051de5:      42       inc %edx
8051de6:      41       inc %ecx
8051de7:      80 3a 00       cmpb $0x0,(%edx)
8051dea:      75 f3      jne 8051ddf <strings_not_equal+0x38>
8051dec:      ba 00 00 00 00       mov $0x0,%edx
8051df1:      89 d0      mov %edx,%eax
8051df3:      8d 65 f4       lea 0xfffffff4(%ebp),%esp
8051df6:      5b       pop %ebx
8051df7:      5e       pop %esi
8051df8:      5f       pop %edi
8051df9:      c9       leave
8051dfa:      c3       ret

080519e5 <phase_2>:
80519e5:      55       push %ebp
80519e6:      89 e5      mov %esp,%ebp
80519e8:      53       push %ebx
80519e9:      83 ec 2c       sub $0x2c,%esp
80519ec:      8d 45 d8       lea 0xffffffd8(%ebp),%eax
80519ef:      50       push %eax
80519f0:      ff 75 08       pushl 0x8(%ebp)
80519f3:      e8 5f 03 00 00       call 8051d57 <read_six_numbers>
80519f8:      bb 01 00 00 00       mov $0x1,%ebx
80519fd:      83 c4 10       add $0x10,%esp
8051a00:      8b 44 9d d4      mov 0xffffffd4(%ebp,%ebx,4),%eax
8051a04:      83 c0 05       add $0x5,%eax
8051a07:      39 44 9d d8      cmp %eax,0xffffffd8(%ebp,%ebx,4)
8051a0b:      74 05      je 8051a12 <phase_2+0x2d>
8051a0d:      e8 9a 07 00 00       call 80521ac <explode_bomb>
8051a12:      43       inc %ebx
8051a13:      83 fb 05       cmp $0x5,%ebx
8051a16:      7e e8      jle 8051a00 <phase_2+0x1b>
8051a18:      8b 5d fc       mov 0xfffffffc(%ebp),%ebx
8051a1b:      c9       leave
8051a1c:      c3       ret

08051d57 <read_six_numbers>:
8051d57:      55       push %ebp
8051d58:      89 e5      mov %esp,%ebp
8051d5a:      83 ec 08       sub $0x8,%esp
8051d5d:      8b 55 0c       mov 0xc(%ebp),%edx
8051d60:      8d 42 14       lea 0x14(%edx),%eax
8051d63:      50       push %eax
8051d64:      8d 42 10       lea 0x10(%edx),%eax
8051d67:      50       push %eax
8051d68:      8d 42 0c       lea 0xc(%edx),%eax
8051d6b:      50       push %eax
8051d6c:      8d 42 08       lea 0x8(%edx),%eax
8051d6f:      50       push %eax
8051d70:      8d 42 04       lea 0x4(%edx),%eax
8051d73:      50       push %eax
8051d74:      52       push %edx
8051d75:      68 72 23 05 08       push $0x8052372
8051d7a:      ff 75 08       pushl 0x8(%ebp)
8051d7d:      e8 d6 f7 ff ff       call 8051558 <_PROCEDURE_LINKAGE_TABLE_+0xb0>
8051d82:      83 c4 20       add $0x20,%esp
8051d85:      83 f8 05       cmp $0x5,%eax
8051d88:      7f 05      jg 8051d8f <read_six_numbers+0x38>
8051d8a:      e8 1d 04 00 00       call 80521ac <explode_bomb>
8051d8f:      c9       leave
8051d90:      c3       ret

For phase 1... is the answer in this line?
8051dc9:      39 c3      cmp %eax,%ebx

I'm kinda lost on how to handle phase 2 though...

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Keywords: diffusing a bomb

	Title
1	Buffer Bomb Phase 0
2	Binary Bomb Final Phase
3	defuse binary bomb
4	Binarybomb phase_2
5	Buffer Bomb Phase 2

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diffusing a bomb

Asked by errang in Assembly Programming Language, C Programming Language

Tags: bomb, assembly, diffuse

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