documentation on polkit-agent-helper-1 and suid

[Alad Wenter]

Hi,

While looking suid files on my system I noticed that 
/usr/lib/polkit-1/polkit-agent-helper-1 is suid root, and I was curious 
on the reasoning beyond this.

If this file is not suid, polkit tty and GUI agents stop working with 
"Error: Incorrect permissions on /usr/lib/polkit-1/polkit-agent-helper-1 
(needs to be setuid root)"

The responsible code: 
https://cgit.freedesktop.org/polkit/tree/src/polkitagent/polkitagenthelper-pam.c#n93

FWIW, I couldn't find a hint in the polkit(8) man page.

Regards,

Alad