Practical Binary Analysis: Build Your Own Linux Tools for Binary Instrumentation, Analysis, and Disassembly by Dennis Andriesse

Author:Dennis Andriesse
Language: eng
Format: epub, mobi, pdf
Publisher: No Starch Press, Inc.
Published: 2019-11-29T16:00:00+00:00

Running the Gadget Finder

The command line interface for the gadget finder is the same as for the disassembly tools. Listing 8-12 shows what the output should look like.

Listing 8-12: Example output of the ROP scanner

$ ./capstone_gadget_finder /bin/ls | head -n 10

adc byte ptr [r8], r8b; ret [ 0x40b5ac ]

adc byte ptr [rax - 0x77], cl; ret [ 0x40eb10 ]

adc byte ptr [rax], al; ret [ 0x40b5ad ]

adc byte ptr [rbp - 0x14], dh; xor eax, eax; ret [ 0x412f42 ]

adc byte ptr [rcx + 0x39], cl; ret [ 0x40eb8c ]

adc eax, 0x5c415d5b; ret [ 0x4096d7 0x409747 ]

add al, 0x5b; ret [ 0x41254b ]

add al, 0xf3; ret [ 0x404d8b ]

add al, ch; ret [ 0x406697 ]

add bl, dh; ret ; xor eax, eax; ret [ 0x40b4cf ]

Each line of output shows a gadget string, followed by the addresses where this gadget is found. For instance, there’s an add al, ch; ret gadget at address 0x406697, which you could use in a ROP payload to add the al and ch registers together. Having an overview of the available gadgets like this helps a lot in selecting suitable ROP gadgets to use when crafting a ROP payload for use in an exploit.

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