> On 04 Nov 2015, at 01:53, Cory Spencer (via RT) > <perl6-bugs-follo...@perl.org> wrote: > > # New Ticket Created by Cory Spencer > # Please include the string: [perl #126560] > # in the subject line of all future correspondence about this issue. > # <URL: https://rt.perl.org/Ticket/Display.html?id=126560 > > > > I recently committed the starts of a POSIX module to the p6 ecosystem and > noticed that when using the POSIX::setuid and POSIX::setgid function calls, > the $*USER and $*GROUP variables to not update as expected when program > privileges change. > > I have attached a sample program demonstrating this below. Note that the > program must be run as root. > > Here is the output on my machine: > > ~$ sudo perl6 ./uid-gid.p6 > $*USER reports UID as: 0 > $*GROUP reports GID as: 0 > > POSIX::getuid reports UID as: 0 > POSIX::getgid reports GID as: 0 > > Dropping privileges to 'nobody' user... > > Privileges dropped. > > $*USER reports UID as: 0 > $*GROUP reports GID as: 0 > > POSIX::getuid reports UID as: 65534 > POSIX::getgid reports GID as: 65534 > > <uid-gid.p6>
The default implementation of $*USER and $*GROUP call an external program and parses the result at the moment. This is something you do not want to do for every access to $*USER. I recommend that the POSIX module installs its own version of $*USER / $*GROUP handling in PROCESS::<$USER> and PROCESS::<$GROUP>, which can then correctly reflect changes in privileges. Something akin to: PROCESS::<$USER> := POSIX::getuid; PROCESS::<$GROUP> := POSIX::getgid; My advise: ENOTABUG, can be closed. Liz
