How to hack any Whatsapp account

 

The Problem: There are lots of ways of creating a linked list. There are

only a few good ones.

The Hack: The Linux kernel's linked list implementation. (See the file

/usr/include/linux/list.h in any kernel source tree.)

There a large number of things we can learn from this simple module.

First since linked lists are a simple and common data structure it makes

sense to create a linked list module to handle them. After all things can get

confused if everyone implements his own linked list. Especially if all the

implementations are slightly different.

Lesson 1: Code Reuse.

The way the linked list is implemented is very efficient and flexible. You

can actually have items that are put on multiple lists.

Lesson 2: Flexible design.

The list functions are well documented. The header files contains

extensive comments using the Doxygen documentation convention (See Hack

65).

Lesson 3: Share your work. Document it so others can use it.

There's there's a mechanism in place to help persuade people to use this

implementation and to avoid writing their own. If you submit a kernel patch

containing a new linked list implementation you will be “politely”

5

 told to use the

standard implementation. Also your code won't get in the kernel until you do.

Lesson 4: Enforcement of standard policy. Mostly through peer pressure.

So by looking at this implementation of a simple linked list we can learn

something. Which leaves us with our final lesson:

Lesson 5: A good hacker learns by reading code written by someone who

knows more about this type of programming that you do.