/Cheng-OS

A extremely simple multiple user OS implemented on top of a given kernel

Primary LanguageC++

REPORT

TARGET

  • adding current uid to process
  • adding a simple login process
  • adding permissions to files
  • adding logout commands

2014-11-21

  • Modify the file system so that the each file contains userID, groupID, permission, creation time, last access time, and last modification time.

    • now only using uid
    • leave everything else to be implemented

  • Add buffered input

    • support backspace
    • does not support arrow keys

  • Add login process

    • setuid() using some simple approach to check for security
      • only root could modify its uid
      • non-privileged process could only set the same uid
    • getuid()

  • Add "exit" command to shell

  • Add SHA1 as the one-way hashing function for password

2014-11-22

  • Add ls -l functionality

  • Add simple access control

    • support individual users
    • support group

2014-11-25

  • Writable File System

2014-11-26

  • Add setgid | setuid bits in the access control list
  • Add su
  • Enable creating new file from open syscall
  • Add chmod
  • Add cp