When loading startup libraries, pass DF_1_NODELETE to indicate these are

unloadable libraries.  This allows us make consider making parts of those
libraries immutable (in future commits)
ok guenther kettenis

diff --git a/libexec/ld.so/loader.c b/libexec/ld.so/loader.c
index 4ed2527..c9e8082 100644 (file)
--- a/libexec/ld.so/loader.c
+++ b/libexec/ld.so/loader.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: loader.c,v 1.196 2022/10/28 15:07:25 kettenis Exp $ */
+/*     $OpenBSD: loader.c,v 1.197 2022/11/06 11:34:50 deraadt Exp $ */
 
 /*
  * Copyright (c) 1998 Per Fogelstrom, Opsycon AB
@@ -326,6 +326,10 @@ _dl_load_dep_libs(elf_object_t *object, int flags, int booting)
                /* propagate DF_1_NOW to deplibs (can be set by dynamic tags) */
                depflags = flags | (dynobj->obj_flags & DF_1_NOW);
 
+               /* Startup libraries are never unmapped and can be immutable */
+               if (booting)
+                       depflags |= DF_1_NODELETE;
+
                for (dynp = dynobj->load_dyn; dynp->d_tag; dynp++) {
                        if (dynp->d_tag == DT_NEEDED) {
                                libcount++;