# AW2Exec - \_\_malloc\_hook

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## **Malloc Hook**

As you can [Official GNU site](https://www.gnu.org/software/libc/manual/html\_node/Hooks-for-Malloc.html), the variable **`__malloc_hook`** is a pointer pointing to the **address of a function that will be called** whenever `malloc()` is called **stored in the data section of the libc library**. Therefore, if this address is overwritten with a **One Gadget** for example and `malloc` is called, the **One Gadget will be called**.

To call malloc it's possible to wait for the program to call it or by **calling `printf("%10000$c")`** which allocates too bytes many making `libc`  calling malloc to allocate them in the heap.

More info about One Gadget in:

{% content-ref url="../one-gadget.md" %}
[one-gadget.md](../one-gadget.md)
{% endcontent-ref %}

## References

* [https://ir0nstone.gitbook.io/notes/types/stack/one-gadgets-and-malloc-hook](https://ir0nstone.gitbook.io/notes/types/stack/one-gadgets-and-malloc-hook)

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<summary><strong>Learn AWS hacking from zero to hero with</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>

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