Binary Bomb phase 4 Assembly code Dump of assembler code for function phase 4 0x0000000000400fe7 sub $0x18, rsp 0x0000000000400feb lea 0x8( rsp), rcx 0x0000000000400ff0 lea 0xc( rsp), rdx 0x0000000000400ff5 mov $0x40290d, esi 0x0000000000400ffa mov $0x0, eax 0x0000000000400fff callq 0x400c00 0x0000000000401004 cmp $0x2, eax 0x0000000000401007 jne 0x401010 0x0000000000401009 cmpl $0xe,0xc( rsp) 0x000000000040100e jbe 0x401015 0x0000000000401010 callq 0x401662 0x0000000000401015 mov $0xe, edx 0x000000000040101a mov $0x0, esi 0x000000000040101f mov 0xc( rsp), edi 0x0000000000401023 callq 0x400fb4 0x0000000000401028 cmp $0x12, eax 0x000000000040102b jne 0x401034 0x000000000040102d cmpl $0x12,0x8( rsp) 0x0000000000401032 je 0x401039 0x0000000000401034 callq 0x401662 0x0000000000401039 add $0x18, rsp 0x000000000040103d retq End of assembler dump (gdb) disassemble m func4 Dump of assembler code for function func4 0x0000000000400fb4 push rbx 0x0000000000400fb5 mov edx, eax 0x0000000000400fb7 sub esi, eax 0x0000000000400fb9 mov eax, ebx 0x0000000000400fbb shr $0x1f, ebx 0x0000000000400fbe add ebx, eax 0x0000000000400fc0 sar eax 0x0000000000400fc2 lea ( rax, rsi,1), ebx 0x0000000000400fc5 cmp edi, ebx 0x0000000000400fc7 jle 0x400fd5 0x0000000000400fc9 lea 0x1( rbx), edx 0x0000000000400fcc callq 0x400fb4 0x0000000000400fd1 add ebx, eax 0x0000000000400fd3 jmp 0x400fe5 0x0000000000400fd5 mov ebx, eax 0x0000000000400fd7 cmp edi, ebx 0x0000000000400fd9 jge 0x400fe5 0x0000000000400fdb lea 0x1( rbx), esi 0x0000000000400fde callq 0x400fb4 0x0000000000400fe3 add ebx, eax 0x0000000000400fe5 pop rbx 0x0000000000400fe6 retq End of assembler dump So what is the answer for bomb 4 Is it 0 7

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Question: Binary Bomb phase 4 Assembly code Dump of assembler code for function phase_4: > 0x0000000000400fe7 : sub $0x18,%rsp 0x0000000000400feb : lea 0x8(%rsp),%rcx 0x0000000000400ff0 : lea

Binary Bomb phase 4 Assembly code

Dump of assembler code for function phase_4: > 0x0000000000400fe7 <+0>: sub $0x18,%rsp 0x0000000000400feb <+4>: lea 0x8(%rsp),%rcx 0x0000000000400ff0 <+9>: lea 0xc(%rsp),%rdx 0x0000000000400ff5 <+14>: mov $0x40290d,%esi 0x0000000000400ffa <+19>: mov $0x0,%eax 0x0000000000400fff <+24>: callq 0x400c00 <__isoc99_sscanf@plt> 0x0000000000401004 <+29>: cmp $0x2,%eax 0x0000000000401007 <+32>: jne 0x401010 0x0000000000401009 <+34>: cmpl $0xe,0xc(%rsp) 0x000000000040100e <+39>: jbe 0x401015 0x0000000000401010 <+41>: callq 0x401662 0x0000000000401015 <+46>: mov $0xe,%edx 0x000000000040101a <+51>: mov $0x0,%esi 0x000000000040101f <+56>: mov 0xc(%rsp),%edi 0x0000000000401023 <+60>: callq 0x400fb4 0x0000000000401028 <+65>: cmp $0x12,%eax 0x000000000040102b <+68>: jne 0x401034 0x000000000040102d <+70>: cmpl $0x12,0x8(%rsp) 0x0000000000401032 <+75>: je 0x401039 0x0000000000401034 <+77>: callq 0x401662 0x0000000000401039 <+82>: add $0x18,%rsp 0x000000000040103d <+86>: retq End of assembler dump. (gdb) disassemble /m func4

Dump of assembler code for function func4: 0x0000000000400fb4 <+0>: push %rbx 0x0000000000400fb5 <+1>: mov %edx,%eax 0x0000000000400fb7 <+3>: sub %esi,%eax 0x0000000000400fb9 <+5>: mov %eax,%ebx 0x0000000000400fbb <+7>: shr $0x1f,%ebx 0x0000000000400fbe <+10>: add %ebx,%eax 0x0000000000400fc0 <+12>: sar %eax 0x0000000000400fc2 <+14>: lea (%rax,%rsi,1),%ebx 0x0000000000400fc5 <+17>: cmp %edi,%ebx 0x0000000000400fc7 <+19>: jle 0x400fd5 0x0000000000400fc9 <+21>: lea -0x1(%rbx),%edx 0x0000000000400fcc <+24>: callq 0x400fb4 0x0000000000400fd1 <+29>: add %ebx,%eax 0x0000000000400fd3 <+31>: jmp 0x400fe5 0x0000000000400fd5 <+33>: mov %ebx,%eax 0x0000000000400fd7 <+35>: cmp %edi,%ebx 0x0000000000400fd9 <+37>: jge 0x400fe5 0x0000000000400fdb <+39>: lea 0x1(%rbx),%esi 0x0000000000400fde <+42>: callq 0x400fb4 0x0000000000400fe3 <+47>: add %ebx,%eax 0x0000000000400fe5 <+49>: pop %rbx 0x0000000000400fe6 <+50>: retq End of assembler dump.

So what is the answer for bomb 4. Is it 0 7 ?

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