File glibc-elf-localscope.diff of Package glibc

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File glibc-elf-localscope.diff of Package glibc

Index: glibc-2.15/elf/dl-close.c
===================================================================
--- glibc-2.15.orig/elf/dl-close.c
+++ glibc-2.15/elf/dl-close.c
@@ -180,24 +180,28 @@ _dl_close_worker (struct link_map *map)
       /* Signal the object is still needed.  */
       l->l_idx = IDX_STILL_USED;
 
+#define mark_used(dmap) \
+  do {								\
+    if ((dmap)->l_idx != IDX_STILL_USED)			\
+      {								\
+	assert ((dmap)->l_idx >= 0 && (dmap)->l_idx < nloaded);	\
+								\
+	if (!used[(dmap)->l_idx])				\
+	  {							\
+	    used[(dmap)->l_idx] = 1;				\
+	    if ((dmap)->l_idx - 1 < done_index)			\
+	      done_index = (dmap)->l_idx - 1;			\
+	  }							\
+      }								\
+  } while (0)
+
       /* Mark all dependencies as used.  */
       if (l->l_initfini != NULL)
 	{
 	  struct link_map **lp = &l->l_initfini[1];
 	  while (*lp != NULL)
 	    {
-	      if ((*lp)->l_idx != IDX_STILL_USED)
-		{
-		  assert ((*lp)->l_idx >= 0 && (*lp)->l_idx < nloaded);
-
-		  if (!used[(*lp)->l_idx])
-		    {
-		      used[(*lp)->l_idx] = 1;
-		      if ((*lp)->l_idx - 1 < done_index)
-			done_index = (*lp)->l_idx - 1;
-		    }
-		}
-
+	      mark_used(*lp);
 	      ++lp;
 	    }
 	}
@@ -206,19 +210,25 @@ _dl_close_worker (struct link_map *map)
 	for (unsigned int j = 0; j < l->l_reldeps->act; ++j)
 	  {
 	    struct link_map *jmap = l->l_reldeps->list[j];
-
-	    if (jmap->l_idx != IDX_STILL_USED)
-	      {
-		assert (jmap->l_idx >= 0 && jmap->l_idx < nloaded);
-
-		if (!used[jmap->l_idx])
-		  {
-		    used[jmap->l_idx] = 1;
-		    if (jmap->l_idx - 1 < done_index)
-		      done_index = jmap->l_idx - 1;
-		  }
-	      }
+	    mark_used(jmap);
 	  }
+      /* And the same for owners of our scopes; normally, our last
+	 scope provider would render us unused, but this can be
+	 prevented by the NODELETE flag. */
+      if (__builtin_expect(l->l_type == lt_loaded
+	                   && (l->l_flags_1 & DF_1_NODELETE), 0))
+	for (size_t cnt = 0; l->l_scope[cnt] != NULL; ++cnt)
+	  /* This relies on l_scope[] entries being always set either
+	     to its own l_symbolic_searchlist address, or some map's
+	     l_searchlist address.  */
+	  if (l->l_scope[cnt] != &l->l_symbolic_searchlist)
+	    {
+	      struct link_map *ls = (struct link_map *)
+		((char *) l->l_scope[cnt]
+		 - offsetof (struct link_map, l_searchlist));
+	      assert (ls->l_ns == nsid);
+	      mark_used(ls);
+	    }
     }
 
   /* Sort the entries.  */

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File glibc-elf-localscope.diff of Package glibc

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