Sumo is a Linux Kernel module that grants root access credentials to any user-space process by PID.

# TL;DR

*.bashrc*
```bash
make                 # build
sudo insmod sumo.ko  # install
./whoami             # test
```

# How it works

In it's `init()` function, *sumo* kernel module creates `/proc/sumo` file and waits for PID to be written. Afterwards, it fetches instance of a `task_struct` [kernel structure](https://medium.com/@boutnaru/linux-kernel-task-struct-829f51d97275) associated with the given PID and modifies its values accordingly. The main point of interest is the data stored in [credentials structure](https://docs.kernel.org/security/credentials.html).

```text
sumo         __        SUdo
         ,;.'--'.      MOdule 
          /"/=,=(
          \(  __/
       ___/    (____
     .'     -  -    '.
    /         v       \
 __/    ,     |    \   '-/'_
{z, ,__/__,__/\__,_ )__(   z}
 \>'   (            \_ `--c/
    _.-'\_      ,   / \_
   (      `.______.'    '.
   \    ,   \    ( __     )
    \    )-'-\__/-'  |   /
     |   |          /  .'
     /  ,)         (   \_
    oooO'           '--Ooo
```