Prevent loader from loading itself

diff --git a/ChangeLog b/ChangeLog
index 70dbc40..bb7f02e 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2011-05-30  Ulrich Drepper  <drepper@gmail.com>
+
+       * elf/rtld.c (dl_main): Don't allow the loader to load itself.
+
 2011-05-29  Ulrich Drepper  <drepper@gmail.com>
 
        [BZ #12350]

diff --git a/elf/rtld.c b/elf/rtld.c
index 174954b..9eb9289 100644 (file)
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -1076,6 +1076,14 @@ of this helper program; chances are you did not intend to run this program.\n\
       /* Now the map for the main executable is available.  */
       main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
 
+      if (GL(dl_rtld_map).l_info[DT_SONAME] != NULL
+         && main_map->l_info[DT_SONAME] != NULL
+         && strcmp ((const char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB])
+                    + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_val,
+                    (const char *) D_PTR (main_map, l_info[DT_STRTAB])
+                    + main_map->l_info[DT_SONAME]->d_un.d_val) == 0)
+       _dl_fatal_printf ("loader cannot load itself\n");
+
       phdr = main_map->l_phdr;
       phnum = main_map->l_phnum;
       /* We overwrite here a pointer to a malloc()ed string.  But since