[systemd-bugs] [Bug 70810] libpam-systemd does not change XDG_RUNTIME_DIR when using su - username

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70810

--- Comment #2 from Gabriel Mainberger <gabisoft at freesurf.ch> ---
If getting the struct passwd * allways by username, it is working with su.

src/login/pam-module.c:166:static int get_user_data

        /*r = audit_loginuid_from_pid(0, &uid);
        if (r >= 0)
                pw = pam_modutil_getpwuid(handle, uid);
        else {*/
                r = pam_get_user(handle, &username, NULL);


Oct 27 08:40:11 andromeda su[8585]: pam_unix(su:session): session closed for
user root
Oct 27 08:40:16 andromeda su[8601]: Successful su for root by gabriel
Oct 27 08:40:16 andromeda su[8601]: + /dev/pts/2 gabriel:root
Oct 27 08:40:16 andromeda su[8601]: pam_unix(su:session): session opened for
user root by gabriel(uid=1000)
Oct 27 08:40:16 andromeda su[8601]: pam_systemd(su:session): Asking logind to
create session: uid=0 pid=8601 service=su type=tty class=user seat=seat0 vtnr=7
tty=/dev/pts/2 display= remote=no remote_user=gabriel remote_host=
Oct 27 08:40:16 andromeda su[8601]: pam_systemd(su:session): Reply from logind:
id=2 object_path=/org/freedesktop/login1/session/_32
runtime_path=/run/user/1000 session_fd=6 seat=seat0 vtnr=7
Oct 27 08:42:31 andromeda su[8601]: pam_unix(su:session): session closed for
user root

The runtime_path is still wrong, but the correct uid is overgiven.

Is there any reason to use the function audit_loginuid_from_pid?

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