For some binaries we can get a invalid section alignment, for example if 
sh_align = 1 and sh_addralign is 0. In the case of a zero size section like 
".note.GNU-stack", this is irrelavent as far as I can tell and we shouldn't
error in this case.

RP 2014/6/11

Upstream-Status: Pending

Index: elfutils-0.158/libelf/elf32_updatenull.c
===================================================================
--- elfutils-0.158.orig/libelf/elf32_updatenull.c	2012-12-14 22:40:48.000000000 +0000
+++ elfutils-0.158/libelf/elf32_updatenull.c	2014-06-11 16:35:43.417386291 +0000
@@ -327,8 +327,8 @@
 		     we test for the alignment of the section being large
 		     enough for the largest alignment required by a data
 		     block.  */
-		  if (unlikely (! powerof2 (shdr->sh_addralign))
-		      || unlikely (shdr->sh_addralign < sh_align))
+		  if (shdr->sh_size && (unlikely (! powerof2 (shdr->sh_addralign))
+		      || unlikely (shdr->sh_addralign < sh_align)))
 		    {
 		      __libelf_seterrno (ELF_E_INVALID_ALIGN);
 		      return -1;