CatJ

A light process isolation sandbox used for Competitive Programming contest.

Features

cgroups: Record cpu and memory usage (may fall back to getrusage)
mount and chroot: Created an isolated file system
setrlimit: Set resource limits (cpu, address size, stack size, file size)
setuid and setgid: Run submission under another user and group
ptrace: Filter submission syscall

Note

To enable all of above features, it is highly recommended to use it under the root user, otherwise it may fall back automatically.

Installation

```bash

Install using cargo

$ cargo install catj

Or you can download binary with installation script

$ curl -fsSL https://bina.egoist.sh/CaCatHead/CatBox | sh

Check installation

$ catj --version catj 0.1.4

Init cgroup for current user

$ ./init.sh $USER ```

Usage

```bash

Compile C++ source code

$ catj compile ./fixtures/aplusb/source/ac.cpp -o a.out

Run a.out

$ catj run --stdin ./fixtures/aplusb/testcases/1.in --read . -- ./a.out 2

Generate report

$ catj --report run --stdin ./fixtures/aplusb/testcases/1.in --stdout ./sub.out --read . -- ./a.out

or

$ catj -r run -i ./fixtures/aplusb/testcases/1.in -o ./sub.out -R . -- ./a.out Status 0 Signal ✓ Time 1 ms Time user 1 ms Time sys 0 ms Memory 0 KB ```