Account for .tbss alignment when adjusting start of relro

Another option might be to not bump "dot" for .tbss alignment in the
main section sizing loop, but that could leak some of the following
section into the TLS segment.  Leakage shouldn't matter since it will
be to bytes past the end of .tdata, but for now this is a safer
option.

	PR ld/19264
	* ldlang.c (lang_size_sections): Don't ignore .tbss when
	adjusting start of relro region.

diff --git a/ld/ChangeLog b/ld/ChangeLog
index d4324ec..d6bf9ab 100644 (file)
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,9 @@
+2015-11-19  Alan Modra  <amodra@gmail.com>
+
+       PR ld/19264
+       * ldlang.c (lang_size_sections): Don't ignore .tbss when
+       adjusting start of relro region.
+
 2015-11-16  Nick Clifton  <nickc@redhat.com>
 
        PR ld/19106

diff --git a/ld/ldlang.c b/ld/ldlang.c
index 3841afc..c45b912 100644 (file)
--- a/ld/ldlang.c
+++ b/ld/ldlang.c
@@ -5457,18 +5457,23 @@ lang_size_sections (bfd_boolean *relax, bfd_boolean check_regions)
 
       /* For sections in the relro segment..  */
       for (sec = link_info.output_bfd->section_last; sec; sec = sec->prev)
-       if (!IGNORE_SECTION (sec)
+       if ((sec->flags & SEC_ALLOC) != 0
            && sec->vma >= expld.dataseg.base
            && sec->vma < expld.dataseg.relro_end - expld.dataseg.relro_offset)
          {
            /* Where do we want to put this section so that it ends as
               desired?  */
-           bfd_vma start = sec->vma;
-           bfd_vma end = start + sec->size;
-           bfd_vma bump = desired_end - end;
+           bfd_vma start, end, bump;
+
+           end = start = sec->vma;
+           if ((sec->flags & SEC_HAS_CONTENTS) != 0
+               || (sec->flags & SEC_THREAD_LOCAL) == 0)
+             end += sec->size;
+           bump = desired_end - end;
            /* We'd like to increase START by BUMP, but we must heed
               alignment so the increase might be less than optimum.  */
-           start += bump & ~(((bfd_vma) 1 << sec->alignment_power) - 1);
+           start += bump;
+           start &= ~(((bfd_vma) 1 << sec->alignment_power) - 1);
            /* This is now the desired end for the previous section.  */
            desired_end = start;
          }