[sudo-users] strange error for some users on AIX

Levente Szente lewus at zeraw.org
Fri Jul 15 07:18:15 MDT 2016

On Fri, Jul 15, 2016 at 1:43 PM, Todd C. Miller wrote:

> On Fri, 15 Jul 2016 13:17:56 +0200, Levente Szente wrote:
> > users using kerberos authentication are receiving a strange error message
> > when trying to run sudo on an AIX box part of a PowerHA cluster:
> > $ sudo -l
> > sudo: perm stack underflow: A system call received a parameter that is
> not
> > valid.
> > sudo: unknown uid: 113
> > Segmentation fault
> >
> > I have seen in the past the large userid could cause problems, but this
> is
> > clearly not the case, the username has only two letters, but on other
> boxes
> > is working, so that should also not be a problem.
> The "perm stack underflow" bug was fixed in sudo 1.8.8.  It is
> triggered by the "unknown uid 113" warning.  The real issue is that
> sudo can't lookup uid 113 to find its name.
> Are you runing the same version of sudo on the working AIX boxes?
> Sudo 1.8.5p3 is somewhat old, I'd suggest trying 1.8.17 and see if
> that resolves the problem.  You can find AIX packages at
> https://www.sudo.ws/download.html#binary
>  - todd

Thanks for the quick reply, I am running the same version on the working
AIX boxes, the only difference is where is not working the boxes are part
of a PowerHA cluster.

Not sure what caused the problem, but updating to 1.8.17 solved it.


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