Re: best way to disable PRIVILEGED?

[Jens Staal <staal1978@xxxxxxxxx>]

On Sun, Jun 28, 2020 at 02:31:27PM +0000, Daniel Shahaf wrote:
> Jens Staal wrote on Sun, 28 Jun 2020 14:10 +0200:
> > the zsh executes but with the error: "zsh: error on TTY read: permission denied"
> > 
> > One of the hacks I did was to redefine seteuid to setuid. I am not sure if that
> > would be the reason for the error
> 
> Set a breakpoint on seteuid and check whether it gets hit.  If it does,
> we can take it from there.
>

Thanks! If you believe that it is unlikely that this is the issue (as you
mention below) I should probably first consider the other hacks done.
Surprisingly few actually, but the major  one might be the terminfo stubs from
old pdcurses.

> > A logical first thing to try however is to follow the instructions in
> > zsh_system.h and remove the seteuid hack and disable PRIVILEGED.
> > 
> 
> I don't see any scenario in which the PRIVILEGED option causes the
> error, notwithstanding your hack.  (The only things special about
> PRIVILEGED are that it's initialized to true in some cases and that
> unsetting it changes the real, saved, and effective UIDs.  Your hack
> won't break these.
> 
> In fact, I'm having trouble seeing what it _could_ break that zsh
> does.  The best I've come up with is launching zsh with different real
> and effective UIDs and then running «EUID=$EUID; UID=$UID».  Pretty
> sure you aren't doing that.)
> 

I am at least not doing it on purpose :) There are many things about Plan9 that
I do not know...

I think I just went for the PRIVILEGED thing since "permission denied" sounded
like something that would have to do with that.

> Cheers,
> 
> Daniel