Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
234 views
in Technique[技术] by (71.8m points)

c++ - Execute Instructions From The Heap

Can I allocate a block on the heap, set its bytes to values that correspond to a function call and its parameters, then use the function call and dereference operators to execute that sequence?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

Yes. How else could Dynamic loading and Linking work? Remembering that some (most?) Operating Systems, and some (most?) Linkers are also written in C/C++. For example,

#include <dlfcn.h>
void* initializer = dlsym(sdl_library,"SDL_Init");
if (initializer == NULL) {
    // report error ...
} else {
    // cast initializer to its proper type and use
}

Also, I believe that a JIT (e.g. GNU lightning and others) in general performs those operations.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...