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You're reading from  Learning Linux Binary Analysis

Product typeBook
Published inFeb 2016
Reading LevelIntermediate
PublisherPackt
ISBN-139781782167105
Edition1st Edition
Languages
C
Tools
Linux
Concepts
Data Analysis
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Author (1)
Ryan "elfmaster" O'Neill
Ryan "elfmaster" O'Neill
author image
Ryan "elfmaster" O'Neill

Ryan "elfmaster" O'Neill is a computer security researcher and software engineer with a background in reverse engineering, software exploitation, security defense, and forensics technologies. He grew up in the computer hacker subculture, the world of EFnet, BBS systems, and remote buffer overflows on systems with an executable stack. He was introduced to system security, exploitation, and virus writing at a young age. His great passion for computer hacking has evolved into a love for software development and professional security research. Ryan has spoken at various computer security conferences, including DEFCON and RuxCon, and also conducts a 2-day ELF binary hacking workshop. He has an extremely fulfilling career and has worked at great companies such as Pikewerks, Leviathan Security Group, and more recently Backtrace as a software engineer. Ryan has not published any other books, but he is well known for some of his papers published in online journals such as Phrack and VXHeaven. Many of his other publications can be found on his website at http://www.bitlackeys.org.
Read more about Ryan "elfmaster" O'Neill

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/proc/kcore and GDB exploration

The /proc/kcore technique is an interface for accessing kernel memory, and is conveniently in the form of an ELF core file that can be easily navigated with GDB.

Using GDB with /proc/kcore is a priceless technique that can be expanded to very in-depth forensics for the skilled analyst. Here is a brief example that shows how to navigate sys_call_table.

An example of navigating sys_call_table

$ sudo gdb -q vmlinux /proc/kcore
Reading symbols from vmlinux...
[New process 1]
Core was generated by `BOOT_IMAGE=/vmlinuz-3.16.0-49-generic root=/dev/mapper/ubuntu--vg-root ro quiet'.
#0  0x0000000000000000 in ?? ()
(gdb) print &sys_call_table
$1 = (<data variable, no debug info> *) 0xffffffff81801460 <sys_call_table>
(gdb) x/gx &sys_call_table
0xffffffff81801460 <sys_call_table>:  0xffffffff811d5260
(gdb) x/5i 0xffffffff811d5260
   0xffffffff811d5260 <sys_read>:  data32 data32 data32 xchg %ax,%ax
   0xffffffff811d5265 <sys_read+5>...
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Learning Linux Binary Analysis
Published in: Feb 2016Publisher: PacktISBN-13: 9781782167105
© 2016 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Ryan "elfmaster" O'Neill

Ryan "elfmaster" O'Neill is a computer security researcher and software engineer with a background in reverse engineering, software exploitation, security defense, and forensics technologies. He grew up in the computer hacker subculture, the world of EFnet, BBS systems, and remote buffer overflows on systems with an executable stack. He was introduced to system security, exploitation, and virus writing at a young age. His great passion for computer hacking has evolved into a love for software development and professional security research. Ryan has spoken at various computer security conferences, including DEFCON and RuxCon, and also conducts a 2-day ELF binary hacking workshop. He has an extremely fulfilling career and has worked at great companies such as Pikewerks, Leviathan Security Group, and more recently Backtrace as a software engineer. Ryan has not published any other books, but he is well known for some of his papers published in online journals such as Phrack and VXHeaven. Many of his other publications can be found on his website at http://www.bitlackeys.org.
Read more about Ryan "elfmaster" O'Neill

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