chroot
Definition
chroot is a Unix/Linux system call and command that changes the apparent root directory for the current running process and its children. This creates an isolated environment, often referred to as a “chroot jail,” which limits the process’s access to the rest of the filesystem. It is commonly used to enhance security by restricting the file system access of potentially vulnerable applications.
Secure Settings Example
# Create a minimal chroot environment
mkdir -p /var/chroot/myapp/{bin,lib,lib64}
# Copy necessary binaries and libraries
cp /bin/bash /var/chroot/myapp/bin
cp /lib/x86_64-linux-gnu/{libtinfo.so.6,libc.so.6,ld-linux-x86-64.so.2} /var/chroot/myapp/lib
# Change root and execute the application
chroot /var/chroot/myapp /bin/bash
Insecure Settings Example
# Incorrectly setting up a chroot environment
mkdir -p /var/chroot/myapp
# Failing to copy necessary binaries and libraries
# This may lead to the application not functioning correctly or breaking out of the chroot
chroot /var/chroot/myapp /bin/bash