[SOLVED] Access denied 'su' with my user.

isidro-ruiz · 07-30-2013, 06:09 PM

Hi people,

I was installing updates to my Slackware14 64 bits and the next day I turned on the computer to install a package like 'su' (because I always do well) tells me permission denied in this way:

Code:

bash-4.2 $ su
bash: / bin / su: Permission denied

I am new to this, anyone know why I can not run it again as usual?

I welcome your comments.

Regards,

Ser Olmy · 07-30-2013, 06:30 PM

Could be something wrong with the permissions on the /bin/su executable (or /usr/bin/su on older versions of Slackware). Take a look with:

Code:

ls -l /bin/su

I believe the default permissions are "-rws--x--x".

daniel w. · 07-31-2013, 04:23 AM

gpasswd -a user wheel

I dont use Slack, but i think that may do the trick. Add your user to the wheel group

regards
D.W

eklavya · 07-31-2013, 08:28 AM

I have ubuntu and CentOS and permission of su file is same in both and that is

Quote:

-rwsr-xr-x. 1 root root 34904 Jun 22 2012 /bin/su

I am not sure if 4755 is a security loop hole because the permission is given to me by default(after installation), I haven't tempered with them so if 4711 is not solving your problem, you can try with 4755.

isidro-ruiz · 07-31-2013, 10:04 AM

Thanks for your answers.

Still I have the same detail.
The above comment Ser Omly is:

Code:

bash-4.2$ ls -l /bin/su
-rws--x--x 1 root root 0 may 16 21:20 /bin/su

After the session I went to root to run what I commented daniel.wiater

Code:

gpasswd -a <user> wheel

And I don't understand eklavya with what he says.

eklavya · 07-31-2013, 10:39 AM

I meant, run this command and try again.
chmod 4755 /bin/su

SAbhi · 07-31-2013, 12:30 PM

Quote:

-rws--x--x 1 root root 0 may 16 21:20 /bin/su

Cant say what could be the issue here But 4755 will not work and should not be done.

isidro-ruiz · 07-31-2013, 12:35 PM

Run this command from the root session, because in my user session says: Operation not permitted.
It does not send the message: Permission denied.
But if I try to run the command:

Code:

slackpkg update

It tells me: Could not find the order.

Thanks for the support.

sundialsvcs · 07-31-2013, 08:35 PM

If you are not in the wheel group, the correct response (after you successfully enter your password) should be: su: sorry ...

... not operation not permitted.

This message implies that the su program is "not executable." However, you should start with which su to determine which program/file is being attempted.

isidro-ruiz · 08-01-2013, 09:12 AM

I checked the file path /bin/su and to my surprise it was empty, first proceeded to run this command:

Code:

chmod 4711 /bin/su

Because 4755 was previously executed.

After entering the root session and then change the mirror I had to update the packages. Step a few minutes to update the installed packages. Restart my Slackware and since /bin/su file contained some bytes and since I can run the command terminal su.

Thank you very much to everybody for the support.