[Question] Spawning a shell starts in root directory?

[Ptomerty]

I spawned a shell to test out kafel capabilities, but I always land in the / directory. Is there any way to land in /home/ctf instead, so a player can just run cat flag.txt instead of cat /home/ctf/flag.txt? Thanks!

Source:

#include "stdio.h"
#include "stdlib.h"

int main() {
    system("/bin/sh");
    return 0;
}

---

Expected output:

root@docker-s-1vcpu-1gb-nyc3-01:~# nc 127.0.0.1 1123
pwd
/
cat flag.txt
flag{test}

---

Actual output:

root@docker-s-1vcpu-1gb-nyc3-01:~/chal# docker run -p 1123:20000 ctf1
*** Running /etc/my_init.d/00_regen_ssh_host_keys.sh...
*** Running /etc/rc.local...
*** Booting runit daemon...
*** Runit started as PID 8
Set TCPDUMP_ENABLE to enable packet capture.
ok: down: tcpdump: 0s, normally up

root@docker-s-1vcpu-1gb-nyc3-01:~# nc 127.0.0.1 1123
pwd
/
cat /home/ctf/flag.txt
flag{test}

Dockerfile:

same as default

Xinetd:

service ctf
{
    disable = no
    socket_type = stream
    protocol    = tcp
    wait        = no
    user        = root
    type        = UNLISTED
    port        = 20000
    bind        = 0.0.0.0
    server      = /home/ctf/ctf.bin
    # server_args = -R
    banner_fail = /etc/banner_fail
    # safety options
    # the maximum instances of this service per source IP address
    per_source  = 10
    # the maximum number of CPU seconds that the service may use
    rlimit_cpu  = 20
    # the Address Space resource limit for the service
    rlimit_as  = 512M
    #access_times = 2:00-9:00 12:00-24:00
    kafel_rule = /etc/pwn.kafel
}