Fix copy relocations handling of unique objects.

(cherry picked from commit 028478fa40d85a73b19638dbe3f83b1acebf370c)

2 files changed, 22 insertions, 3 deletions

diff --git a/ChangeLog b/ChangeLog
index c97afec487..850d300713 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2011-03-10  Ulrich Drepper  <drepper@gmail.com>
+
+	[BZ #12510]
+	* elf/dl-lookup.c (do_lookup_x): For copy relocations of unique objects
+	copy from the symbol referenced in the relocation to initialize the
+	used variable.
+	Patch by Piotr Bury <pbury@goahead.com>.
+
 2011-03-06  Ulrich Drepper  <drepper@gmail.com>
 
 	* elf/dl-load.c (_dl_map_object): If we are looking for the first
diff --git a/elf/dl-lookup.c b/elf/dl-lookup.c
index 763ec16fa4..0a7b94b2ee 100644
--- a/elf/dl-lookup.c
+++ b/elf/dl-lookup.c
@@ -1,5 +1,5 @@
 /* Look up a symbol in the loaded objects.
-   Copyright (C) 1995-2005, 2006, 2007, 2009 Free Software Foundation, Inc.
+   Copyright (C) 1995-2007, 2009, 2011 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -363,8 +363,19 @@ do_lookup_x (const char *undef_name, uint_fast32_t new_hash,
 		      if (entries[idx].hashval == new_hash
 			  && strcmp (entries[idx].name, undef_name) == 0)
 			{
-			  result->s = entries[idx].sym;
-			  result->m = (struct link_map *) entries[idx].map;
+			  if ((type_class & ELF_RTYPE_CLASS_COPY) != 0)
+			    {
+			      /* We possibly have to initialize the central
+				 copy from the copy addressed through the
+				 relocation.  */
+			      result->s = sym;
+			      result->m = (struct link_map *) map;
+			    }
+			  else
+			    {
+			      result->s = entries[idx].sym;
+			      result->m = (struct link_map *) entries[idx].map;
+			    }
 			  __rtld_lock_unlock_recursive (tab->lock);
 			  return 1;
 			}