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Is it possible to use hooks to jump to another process’ running memory, and then jump back, without anything like a DLL injection?
For instance, if process A has a procedure foo and process B has a procedure bar with an identical prototype to foo (used for a hook), is it possible to hook foo to jmp to bar, assuming both processes are running?
EDIT: This needs to be done on Windows.
A process by definition is a sandbox. If you even by mistake step outside your address space it’s raised and caught as a SIG_USR signal and reported as a segmentation fault
Having said that there are inter process communication mechanisms such as shared memory -shmem, Pipes and sockets that you can use to communicate across processes.
Edit :
There are RPC ( remote procedure calls) mechanisms available as well Such as CORBA That provide remote method invocation.