pysquishy 0.1.1

LLVM pass wrapper library for creating robust shellcode

squishy 🐻‍❄️

A collection of new (LLVM 15) passes to compile normal-looking code to a callable, jump-to-able blob.

Inspired by SheLLVM, but should address some of the outdated issues with that project. Thanks to SheLLVM for the inspiration :)

Building

squishy 🐻‍❄️ uses the meson modern build system. To build, first ensure that meson and ninja are installed, and that you have an installation of llvm-15 which you can get here.

Then, invoke:

meson build
cd build
meson compile

to produce the library.

Passes

1. Aggressive Inliner: Recursively applies alwaysinline and inlines function calls.
2. Deduplicate Calls: Repeated calls to inlined code can be directed to a block in the main function as if it were a function without making a call.
3. Inline Globals: Global variables need to be inlined wherever they are used (in practice, stack all globals into the main function).