Frago9876543210 / libshim-demo

Example usage of libshim to prevent runtime errors

libshim-demo

Example usage of libshim to prevent runtime errors

Building

export CC=/usr/bin/clang
export CXX=/usr/bin/clang++

mkdir -p build && cd build
cmake ..
make VERBOSE=1

LD_PRELOAD=./injector/libinjector.so ./binary/binary

Output with symbols map (see injector/shim_demo)

injected into process

string_wrapper::string_wrapper("custom string from injector.so", 31)
custom string from injector.so
injector.so called string_wrapper::getBuffer(): "This data would be copied into heap"
string_wrapper::~string_wrapper()

string_wrapper::string_wrapper("regular string from this executable", 36)
regular string from this executable
binary called string_wrapper::getBuffer(): "This data would be copied into heap"
string_wrapper::~string_wrapper()

Output without it (empty file)

injected into process

./binary/binary: symbol lookup error: ./injector/libinjector.so: undefined symbol: _ZN14string_wrapperC1EPcm