How to read and write to process memory using proc_rwmem

[zecoxao 1,355]

Credits(these go first):
Original authors: wskeu(for the reading part), wildcard (for the writing part)


Requirements:
* 1.76 console
* elf-loader
* ps4-sdk
* the payload source
* a brain

 

Steps:
1. Compile the payload. Specifically to what you want to patch, the size, etc. So, this:
 

/* set variables for reading and writing mem */
size_t dumphexsize = 0x200;
size_t dumpsize = 0x1; // size that you want to read
size_t writesize = 0x1; // size of the data you are overwriting
uint64_t base = start[0]; // use the number of the mapping you want to write to, starting with 0
size_t intoBase = 0x465FC9; // relative position of base

and this:

char *target = "SceShellCore";

2. Load elf-loader. Let it stabilize on stage 5. (To increase success rate, clear cookies, cache and history)
3. Load the payload. Specifically:

#listener
socat - TCP:my.ps4.ip:5052

#sender
socat -u FILE:path/to/rwmem TCP:my.ps4.ip:5053

4. This payload will take a while to listen to logs. Be patient. After a while it'll show log output with the memory before and memory after.

Notes: this is process peek and poke (reading and writing to process memory) using proc_rwmem, which is more efficient than the old method.