Cygwin: fix permissions of winpid symlinks

The winpid symlinks got created with no query permissions, so
only admins could see all Cygwin processes.  Create symlinks
so everyone has query permissions instead.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygwin/pinfo.cc

@@ -325,7 +325,8 @@ pinfo::create_winpid_symlink ()
   __small_swprintf (pid_name, L"%u", procinfo->pid);
   RtlInitUnicodeString (&pid_str, pid_name);
   InitializeObjectAttributes (&attr, &sym_str, OBJ_CASE_INSENSITIVE,
-			      get_shared_parent_dir (), NULL);
+			      get_shared_parent_dir (),
+			      everyone_sd (SYMBOLIC_LINK_QUERY));
   NtCreateSymbolicLinkObject (&winpid_hdl, SYMBOLIC_LINK_ALL_ACCESS,
 			      &attr, &pid_str);
 }

winsup/cygwin/release/3.0.4

@@ -0,0 +1,13 @@
+What's new:
+-----------
+
+
+What changed:
+-------------
+
+
+Bug Fixes
+---------
+
+- Fix access to process list
+  Addresses: https://cygwin.com/ml/cygwin/2019-03/msg00253.html