Cannot access su in fedora 17

Question

I am using Fedora 17. by mistaken, I have given full permission as root, for all the files in

/usr/bin

My command was

chmod 777 *

and also I gave full permission for a file(I can't remember the name of the file) in /proc. my command was

chmod 777 [filename]

Now when I enter the su command and enter the password it says

su: incorrect password

can someone help me to fix this.

Answer 1

Try to change root's password:

1. Boot from a LiveCD.
2. Open a root shell.

3. Mount your system partition: (replace /dev/sda1 with your partition)

   mount /dev/sda1 /mnt
   

4. Chroot into your installed system:

   chroot /mnt
   

5. Change root's password:

   passwd root