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Author Topic: Writing shellcode in C++  (Read 1389 times)


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Re: Writing shellcode in C++
« on: October 17, 2016, 08:16:21 pm »
Some parts of the language generate position-independent code and others don't.

Safe stuff:
  • Functions
  • Classes
  • Templates
  • new/delete: the implementation of these can be overriden to make them use HealAlloc/HeapFree

Unsafe stuff:
  • String literals, global variables, static members of classes: in x86, the compiler hard-codes the adresses of these variables, so you have to create some kind of idiom (eg. delta offset) to access them. And still they are stored out of .text, so you have to work around that merging data sections into .text and giving it RWE attributes. In x64 references are relative to RIP so it's all good. For string literals there are a lot of options, one example is this.
  • Class hierarchies with virtual functions,C++ exceptions: the implementation of these is usually in stdlibc++, which means if you link with /nodefaultlib you can't use them

My two cents
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