su: /bin/bash: Permission denied
 

This problem is a bit strange. The machine is installed with FC4. I can log in as root directly. However, whenver I log in as a normal user and use su, the following error appear
su: /bin/bash: Permission denied


The same thing also happens when I tried su xxxx after logging as root.

I checked /bin/bash and file permission and did not see anything wrong. I did google around and did not find any useful suggestion. Thanks in advance for your help.

this thread is relative and might solve your problem too:
http://www.linuxquestions.org/questi...d.php?t=457474

After digging around for one hour, finally figure out the reason:
It has something to do with SELINUX. Once I typed setenforce 0, everything is working fine.

Now, it is time to dig around SELINUX. :-(

Ayup... SELinux caused me great deal of pain while setting up a new website. You will be able to identify if the problem is related to SELinux by searching through /var/log/messages for 'AVC' denials.

If you want to keep on running SELinux but unconfine some binaries and files you'd have to change the security context of the file in question to unconfined_t

chcon -t unconfined_t </path/filename>

AVC Denials
 

sounds good, but what do you do with fedora 7. You change the permissions, and in less than 5 minutes, it's back to the same denials. With friends added. It got to the point where it would not let me use my cd and dvd rom drives, access my mail, etc... And THEN, it started denying anything with defaut_t


What is with selinux?

Thanks

i've solved today exactly the same problem by adjusting permissions on all folders in root folder

all folder must be 755

and

lost+found = 770
proc = 555
root = 750
tmp =777