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Darknet – Hacking Tools, Hacker News & Cyber Security

Darknet - Hacking Tools, Hacker News & Cyber Security

Darknet is your best source for the latest hacking tools, hacker news, cyber security best practices, ethical hacking & pen-testing.

AddressSanitizer – A Fast Memory Error Detector

July 4, 2015

Views: 2,179

AddressSanitizer (aka ASan) is a very fast memory error detector for C/C++, Tthe average slowdown of the instrumented program is ~2x. The tool works on x86 Linux and Mac, and ARM Android. AddressSanitizer is based on compiler instrumentation and directly-mapped shadow memory.

AddressSanitizer - A Fast Memory Error Detector

The tool consists of a compiler instrumentation module (currently, an LLVM pass) and a run-time library which replaces the malloc function.

Features

It finds:

  • Use after free (dangling pointer dereference)
  • Heap buffer overflow
  • Stack buffer overflow
  • Global buffer overflow
  • Use after return
  • Initialization order bugs

Using AddressSanitize

In order to use AddressSanitizer you will need to compile and link your program using clang with the -fsanitize=address switch. To get a reasonable performance add -O1 or higher, and to get nicer stack traces in error messages add -fno-omit-frame-pointer.

Limitations

AddressSanitizer does not prevent any uninitialized memory reads, and only prevents some use-after-return bugs. It is also not capable of preventing all arbitrary memory corruption bugs. Arbitrary write bugs due to integer underflow/overflows (when the integer with undefined behaviour is used to calculate memory address offsets). Adjacent buffers in structs and classes are not protected from overflow, in part to prevent breaking backwards compatibility

You can get AddressSanitizer as a part of LLVM starting with version 3.1 and a part of GCC starting with version 4.8.

Or read more here.

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Filed Under: Exploits/Vulnerabilities, Hacking Tools, Secure Coding Tagged With: code security, dynamic analysis



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