heap-exploitation | heap exploitation is a guide to understanding the internals

by DhavalKapil C Version: v1.0.0 License: No License

X-Ray Key Features Code Snippets Community Discussions(2)Vulnerabilities Install Support

kandi X-RAY | heap-exploitation Summary

heap-exploitation is a C library. heap-exploitation has no bugs, it has no vulnerabilities and it has medium support. You can download it from GitHub.

This short book is written for people who want to understand the internals of 'heap memory', particularly the implementation of glibc's 'malloc' and 'free' procedures, and also for security researchers who want to get started in the field of heap exploitation. The first section of the book covers an in-depth, yet concise, description about heap internals. The second section covers some of the most famous attacks. It is assumed that the reader is unfamiliar with this topic. For experienced readers, this text might be good for a quick revision. Read for free online (recommended) or download the PDF or ePUB or Mobi/Kindle editions. You can support this book by donating on Gratipay. This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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heap-exploitation has a medium active ecosystem.

It has 1199 star(s) with 129 fork(s). There are 41 watchers for this library.

It had no major release in the last 12 months.

There are 6 open issues and 2 have been closed. On average issues are closed in 30 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of heap-exploitation is v1.0.0

Quality

heap-exploitation has 0 bugs and 0 code smells.

Security

heap-exploitation has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

heap-exploitation code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

heap-exploitation does not have a standard license declared.

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Without a license, all rights are reserved, and you cannot use the library in your applications.

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heap-exploitation releases are available to install and integrate.

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heap-exploitation Key Features

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Community Discussions

Trending Discussions on heap-exploitation

Function pointer allocated on the heap

Understanding "corrupted size vs. prev_size" glibc error

QUESTION

Function pointer allocated on the heap

Asked 2019-Oct-05 at 20:30

I want to declare a local function pointer, allocate space for the pointer on the heap, point to different functions with it on the fly.

...

ANSWER

Answered 2019-May-02 at 19:38

You can't assign to *fp because that expression has function type.

fp is meant to store a pointer, in this case a pointer to a function. So you don't need to allocate anything. Just assign the function's address:

Source https://stackoverflow.com/questions/55958899

QUESTION

Understanding "corrupted size vs. prev_size" glibc error

Asked 2019-Apr-14 at 22:41

I have implemented a JNA bridge to FDK-AAC. Source code can be found in here

When bench-marking my code, I can get hundreds of successful runs on the same input, and then occasionally a C-level crash that'll kill the entire process, causing a core-dump to be generated:

Looking at the core dump, it looks like this:

...

ANSWER

Answered 2019-Apr-14 at 22:41

OK, so I've managed to overcome this issue.

First of all - A practical cause to "corrupted size vs. prev_size" is quite simple - memory chunk control structure fields in the adjacent following chunk are being overwritten due to out-of-bounds access by the code. if you allocate x bytes for pointer p but wind up writing beyond x in regards to the same pointer, you might get this error, indicating the current memory allocation (chunk) size is not the same as what's found in the next chunk control structure (due to it being overwritten).

As for the cause for this memory leak - structure mapping done in the Java/JNA layer implied different #pragma related padding/alignment from what dll/so was compiled with. This in turn, caused data to be written beyond the allocated structure boundary. Disabling that alignment made the issues go away. (Thousands of executions without a single crash!).

Source https://stackoverflow.com/questions/49628615

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

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No vulnerabilities reported

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