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Learning Linux Binary Analysis

You're reading from   Learning Linux Binary Analysis Learning Linux Binary Analysis

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Product type Paperback
Published in Feb 2016
Publisher Packt
ISBN-13 9781782167105
Length 282 pages
Edition 1st Edition
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Author (1):
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Ryan "elfmaster" O'Neill Ryan "elfmaster" O'Neill
Author Profile Icon Ryan "elfmaster" O'Neill
Ryan "elfmaster" O'Neill
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Table of Contents (11) Chapters Close

Preface 1. The Linux Environment and Its Tools FREE CHAPTER 2. The ELF Binary Format 3. Linux Process Tracing 4. ELF Virus Technology – Linux/Unix Viruses 5. Linux Binary Protection 6. ELF Binary Forensics in Linux 7. Process Memory Forensics 8. ECFS – Extended Core File Snapshot Technology 9. Linux /proc/kcore Analysis Index

Detecting other forms of control flow hijacking


There are many reasons to modify a binary, and depending on the desired functionality, the binary control flow will be patched in different ways. In the previous example of the Retaliation Virus, the entry point in the ELF file header was modified. There are many other ways to transfer execution to the inserted code, and we will discuss a few of the more common approaches.

Patching the .ctors/.init_array section

In ELF executables and shared libraries, you will notice that there is a section commonly present named .ctors (commonly also named .init_array). This section contains an array of addresses that are function pointers called by the initialization code from the .init section. The function pointers refer to functions created with the constructor attribute, which are executed before main(). This means that the .ctors function pointer table can be patched with an address that points to the code that has been injected into the binary, which...

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