Programming
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You're reading from  Mastering Assembly Programming

Product typeBook
Published inSep 2017
Reading LevelIntermediate
PublisherPackt
ISBN-139781787287488
Edition1st Edition
Languages
Assembly
Concepts
Programming Language
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Author (1)
Alexey Lyashko
Alexey Lyashko
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Alexey Lyashko

Alexey Lyashko is an Assembly language addict, independent software reverse engineer, and consultant. At the very beginning of his career, when he was a malware researcher at Aladdin Knowledge Systems, he invented and developed a generic code recognition method known as HOFA™. After spending a few years in the anti-malware industry and gaining sufficient experience in low-level development and reverse engineering, Alexey switched to content protection and worked as a reverse engineering consultant with Irdeto's BD+ department, actively participating in content protection technology development. Since 2013, he has worked with several software development companies providing reverse engineering and low-level software development consultancy.
Read more about Alexey Lyashko

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The issue

Whether we try to run our executables on Windows or on Linux, we would hardly notice any problem, as the program asks for our name and then prints it back. This will keep working in a stable manner as long as the program does not encounter a name longer than 127 ASCII characters (the 128th character is the terminating NULL value) and such names exist. Let's try to run this executable (we are referring to the one built for Windows, but the same idea applies to the Linux executable too) and feed it with a long line of text, much longer than 127 characters. This is what will happen:

The reason for this message is the gets() function. If C is not your language of choice, you may be unaware of the fact that this function does not check the length of the input, which may lead to stack corruption in the best case (just like what caused the preceding message to appear...

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Mastering Assembly Programming
Published in: Sep 2017Publisher: PacktISBN-13: 9781787287488
© 2017 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Alexey Lyashko

Alexey Lyashko is an Assembly language addict, independent software reverse engineer, and consultant. At the very beginning of his career, when he was a malware researcher at Aladdin Knowledge Systems, he invented and developed a generic code recognition method known as HOFA™. After spending a few years in the anti-malware industry and gaining sufficient experience in low-level development and reverse engineering, Alexey switched to content protection and worked as a reverse engineering consultant with Irdeto's BD+ department, actively participating in content protection technology development. Since 2013, he has worked with several software development companies providing reverse engineering and low-level software development consultancy.
Read more about Alexey Lyashko

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