[Bug 296532] Re: Reuse of a user id causes a transfer of ownership of a file from deleted user to newly created user

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https://bugs.launchpad.net/bugs/296532

Title:
  Reuse of a user id causes a transfer of ownership of a file from
  deleted user to newly created user

Status in adduser package in Ubuntu:
  Won't Fix
Status in adduser package in Debian:
  Confirmed

Bug description:
  Binary package hint: bash

  The scenario goes like this; this is a description of exactly what I
  did. User test existed on the system. I delete user test and create
  user test again. Then i go to a folder with rwxrwxrwx permissions that
  is /home/rakesh/test and switch user to test from root. Next I create
  a file hello.sh and give it permissions rwsrwsrwx. After that I exit
  user test and get back to root and delete user test, which results in
  the owner and group of the file changing to 1001 which was the uid&gid
  assigned to test. This is all fine.

  Now, I create user test2 and uid 1001 gets reused. Doing ls -l now
  shows me that hello.sh now has owner test2. Whats even more
  interesting is that the setuid still remains. How is this valid
  behaviour?

  
  Version Info:
  root at rakesh-vm:/home/rakesh/test# uname -a
  Linux rakesh-vm 2.6.24-21-generic #1 SMP Tue Oct 21 23:43:45 UTC 2008 i686 GNU/Linux
  root at rakesh-vm:/home/rakesh/test# cat /etc/issue
  Ubuntu 8.04.1 \n \l

  
  Below is the actual console output:
  -- Start copy paste from console --

  root at rakesh-vm:/home/rakesh# cd
  root at rakesh-vm:~# deluser test
  Removing user `test' ...
  Warning: Removing group `test', since no other user is part of it.
  Done.
  root at rakesh-vm:~# clear
  root at rakesh-vm:~# clear
  root at rakesh-vm:~# adduser test
  Adding user `test' ...
  Adding new group `test' (1001) ...
  Adding new user `test' (1001) with group `test' ...
  The home directory `/home/test' already exists.  Not copying from `/etc/skel'.
  Enter new UNIX password:
  Retype new UNIX password:
  passwd: password updated successfully
  Changing the user information for test
  Enter the new value, or press ENTER for the default
          Full Name []:
          Room Number []:
          Work Phone []:
          Home Phone []:
          Other []:
  Is the information correct? [y/N] y
  root at rakesh-vm:~# cd /home/rakesh/test
  root at rakesh-vm:/home/rakesh/test# ls
  root at rakesh-vm:/home/rakesh/test# su test
  test at rakesh-vm:/home/rakesh/test$ vim hello.sh
  test at rakesh-vm:/home/rakesh/test$ cat hello.sh
  echo $HOME
  test at rakesh-vm:/home/rakesh/test$ ls -l hello.sh
  -rw-r--r-- 1 test test 11 2008-11-10 17:21 hello.sh
  test at rakesh-vm:/home/rakesh/test$ chmod 777 hello.sh
  test at rakesh-vm:/home/rakesh/test$ chmod +s hello.sh
  test at rakesh-vm:/home/rakesh/test$ ls -l
  total 4
  -rwsrwsrwx 1 test test 11 2008-11-10 17:21 hello.sh
  test at rakesh-vm:/home/rakesh/test$ exit
  exit
  root at rakesh-vm:/home/rakesh/test# sh hello.sh
  /root
  root at rakesh-vm:/home/rakesh/test# ls -l
  total 4
  -rwsrwsrwx 1 test test 11 2008-11-10 17:21 hello.sh
  root at rakesh-vm:/home/rakesh/test# deluser test
  Removing user `test' ...
  Warning: Removing group `test', since no other user is part of it.
  Done.
  root at rakesh-vm:/home/rakesh/test# ls -l
  total 4
  -rwsrwsrwx 1 1001 1001 11 2008-11-10 17:21 hello.sh
  root at rakesh-vm:/home/rakesh/test# adduser test2
  Adding user `test2' ...
  Adding new group `test2' (1001) ...
  Adding new user `test2' (1001) with group `test2' ...
  Creating home directory `/home/test2' ...
  Copying files from `/etc/skel' ...
  Enter new UNIX password:
  Retype new UNIX password:
  passwd: password updated successfully
  Changing the user information for test2
  Enter the new value, or press ENTER for the default
          Full Name []:
          Room Number []:
          Work Phone []:
          Home Phone []:
          Other []:
  Is the information correct? [y/N] y
  root at rakesh-vm:/home/rakesh/test# ls -l
  total 4
  -rwsrwsrwx 1 test2 test2 11 2008-11-10 17:21 hello.sh
  root at rakesh-vm:/home/rakesh/test# uname -a
  Linux rakesh-vm 2.6.24-21-generic #1 SMP Tue Oct 21 23:43:45 UTC 2008 i686 GNU/Linux
  root at rakesh-vm:/home/rakesh/test# cat /etc/issue
  Ubuntu 8.04.1 \n \l

  root at rakesh-vm:/home/rakesh/test#

  -- End copy paste from console --

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