Experimenting shell injection with ptrace.

1. Build docker image ptrace-exp:

docker build . --tag ptrace-exp

2. Run image ptrace-exp:

docker run --name ptrace-1 --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -it ptrace-exp  bash

3. In container, run tracee, copy the pid printed:

(docker) ./tracee

4. From another session, access the same container from the outside:

docker exec -it ptrace-1 /bin/bash

5. In container, run tracer to inject:

(docker) ./tracer <pid>

6. Now we should be able to run arbitrary commands from the first session.