[Bug 294003] libpam/modules/pam_xdg: #define BASE_RUNTIME_DIR_PREFIX "/var/run/xdg" add trailing slash ("/")?

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294003

            Bug ID: 294003
           Summary: libpam/modules/pam_xdg: #define
                    BASE_RUNTIME_DIR_PREFIX "/var/run/xdg" add trailing
                    slash ("/")?
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: conf
          Assignee: bugs@FreeBSD.org
          Reporter: ohartmann@walstatt.org

Just testing some issues of x11/xdm with security/sssd2 by using
security/pamtester.

I get bitten by an error in "open_session":

[ohartmann]: pamtester -v xdm ohartmann open_session
pamtester: invoking pam_start(xdm, ohartmann, ...)
pamtester: performing operation - open_session
Can't mkdir /var/run/xdgpamtester: Session failure

There is a "/" missing between xdg and pamtester.

This can be mitigated by add to /etc/pam.d/xdm:

[...]
session         required        pam_xdg.so     
runtime_dir_prefix=/var/run/xdg/

But it also can be mitigated by using in
/usr/src/lib/libpam/modules/pam_xdg/pam_xdg.c

[...]
#define BASE_RUNTIME_DIR_PREFIX "/var/run/xdg/"

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