Compel

[1]

Usage ideas

One thing parasite code can do is call clone() and create thread having access to main process VM, FDT, FS, etc. The new thread can then

• Check socket FDs to get stuck/closed by polling them
• Apply "logrotate" on the fly
• Garbage collector
• Catch SIGSEGV, do smth with mappings and act upon "illegal" memory access

Another is to do some activity on the victim and then just unload. With this we can

• Death detection. Open pipe/socket and pass the other end outside. Once the victim dies the pipe/socket will wake up.
• Binary updates. E.g. live patching or libr relink
• Inject socket spy -- instead of opened socket create a unix one, put it in place of original one and send the latter back to caller so that any traffic flow in one goes "through" the spy
• Do "nohup" on the fly
• Debug stuff by MSG_PEEK-ing sockets messages of tee+splice sockets
• Re-connect sleeping sockets to other addresses (not 100% safe)
• "Soft" restart of a service -- call execve() from it's context
• Force entering into CT (except pid namespace, probably)
• Re-open all files (and cwd, root) to facilitate moving on new / (e.g. for disk replacement)
• Remove leaks from e.g. malloc/free heap