Hello,

I am new to QNX, and have recently installed the QNX 6.6.0 Neutrino
RTOS runtime in VMware Player, from theVM-QNXSDP660-201402230339.iso
image (downloaded from this link
http://www.qnx.com/download/feature.html?programid=26217).

I have created a new user and set up passwords for both root and the
new user.  However, I am having problems with the "su" command. I can
switch from root (logged in automatically) to the new user without a
problem:

# su new_user

(as root, I'm never prompted for the user's password). However, when
trying to switch from new_user to root:

$ su root
password:

After entering the password, the su command crashes wth the following error:

*** stack smashing detected ***: su terminated
Abort (core dumped)

Note 1: I have modified the setuid property of the su command with

# chmod u+s /bin/su

as described in the User's guie and in this post:
http://www.openqnx.com/phpbbforum/viewtopic.php?t=218

so the command now has the following permissions: -rwsr-xr-x

Note 2: If I remove the password for root, the crash does not hapen,
i.e., everything works fine.

Any help with this issue will be greately appreciated.

Best regards,
damjan