From: Ulrich Drepper <drepper@gmail.com>
Date: Mon, 30 May 2011 05:55:40 +0000 (-0400)
Subject: Prevent loader from loading itself
X-Git-Tag: upstream/2.30~12328
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=01f16ab0a581838d44ad79e82c0c3e1691d8506e;p=external%2Fglibc.git

Prevent loader from loading itself
---

diff --git a/ChangeLog b/ChangeLog
index 70dbc40..bb7f02e 100644
--- 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
--- 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