[BZ #3924]

	* sysdeps/i386/dl-trampoline.S (_dl_runtime_profile): Fix a few
	more little bugs in creating the stack frame when pltexit has to
	be called.

ChangeLog

@@ -1,5 +1,10 @@
 2007-10-06  Ulrich Drepper  <drepper@redhat.com>
 
+	[BZ #3924]
+	* sysdeps/i386/dl-trampoline.S (_dl_runtime_profile): Fix a few
+	more little bugs in creating the stack frame when pltexit has to
+	be called.
+
 	* nscd/nscd_helper.c (__nscd_cache_search): Prevent endless loops.
 	* nscd/connections.c (verify_persistent_db): Recognize circular lists.
 

nscd/connections.c

@@ -378,8 +378,9 @@ verify_persistent_db (void *mem, struct database_pers_head *readhead, int dbnr)
   nscd_ssize_t he_cnt = 0;
   for (nscd_ssize_t cnt = 0; cnt < head->module; ++cnt)
     {
-      ref_t first = head->array[cnt];
-      ref_t work = first;
+      ref_t trail = head->array[cnt];
+      ref_t work = trail;
+      int tick = 0;
 
       while (work != ENDREF)
 	{
@@ -439,9 +440,12 @@ verify_persistent_db (void *mem, struct database_pers_head *readhead, int dbnr)
 
 	  work = here->next;
 
-	  if (work == first)
+	  if (work == trail)
 	    /* A circular list, this must not happen.  */
 	    goto fail;
+	  if (tick)
+	    trail = ((struct hashentry *) (data + trail))->next;
+	  tick = 1 - tick;
 	}
     }
 

nscd/nscd_helper.c

@@ -416,8 +416,10 @@ __nscd_cache_search (request_type type, const char *key, size_t keylen,
   unsigned long int hash = __nis_hash (key, keylen) % mapped->head->module;
   size_t datasize = mapped->datasize;
 
-  ref_t first = mapped->head->array[hash];
-  ref_t work = first;
+  ref_t trail = mapped->head->array[hash];
+  ref_t work = trail;
+  int tick = 0;
+
   while (work != ENDREF && work + sizeof (struct hashentry) <= datasize)
     {
       struct hashentry *here = (struct hashentry *) (mapped->data + work);
@@ -457,8 +459,21 @@ __nscd_cache_search (request_type type, const char *key, size_t keylen,
       work = here->next;
       /* Prevent endless loops.  This should never happen but perhaps
 	 the database got corrupted, accidentally or deliberately.  */
-      if (work == first)
+      if (work == trail)
 	break;
+      if (tick)
+	{
+	  struct hashentry *trailelem;
+	  trailelem = (struct hashentry *) (mapped->data + trail);
+
+#ifndef _STRING_ARCH_unaligned
+	  /* We have to redo the checks.  Maybe the data changed.  */
+	  if ((uintptr_t) trailelem & (__alignof__ (*trailelem) - 1))
+	    return NULL;
+#endif
+	  trail = trailelem->next;
+	}
+      tick = 1 - tick;
     }
 
   return NULL;

sysdeps/i386/dl-trampoline.S

@@ -113,6 +113,7 @@ _dl_runtime_profile:
 	movl %ebx, %ecx
 	orl $4, %ebx		# Increase frame size if necessary to align
 				# stack for the function call
+	andl $~3, %ebx
 	movl %esp, %edi
 	subl %ebx, %edi
 	movl %esp, %ebx
@@ -121,9 +122,9 @@ _dl_runtime_profile:
 	shrl $2, %ecx
 	rep
 	movsl
-	movl (%edi), %esi
+	movl (%ebx), %esi
 	cfi_restore (esi)
-	movl 4(%edi), %edi
+	movl 4(%ebx), %edi
 	cfi_restore (edi)
 	/*
 	   %ebx+40  return address