Don't align start of segment unless alignment is larger than page size.

This fixes an issue where a page-aligned data section, combined with -z relro,
could lead to a gap between text and data segments larger than a page, and
we would fail to overlap the segments in the file.

gold/
	* layout.cc (Layout::set_segment_offsets): Don't align start of segment
	unless alignment is larger than page size.

diff --git a/gold/ChangeLog b/gold/ChangeLog
index 93529fe..1e73aa8 100644 (file)
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,8 @@
+2015-01-09  Cary Coutant  <ccoutant@google.com>
+
+       * layout.cc (Layout::set_segment_offsets): Don't align start of segment
+       unless alignment is larger than page size.
+
 2015-01-06  H.J. Lu  <hongjiu.lu@intel.com>
            Cary Coutant  <ccoutant@google.com>
 

diff --git a/gold/layout.cc b/gold/layout.cc
index acc03b2..bcdaac8 100644 (file)
--- a/gold/layout.cc
+++ b/gold/layout.cc
@@ -3524,7 +3524,9 @@ Layout::set_segment_offsets(const Target* target, Output_segment* load_seg,
              // put them on different pages in memory. We will revisit this
              // decision once we know the size of the segment.
 
-             addr = align_address(addr, (*p)->maximum_alignment());
+             uint64_t max_align = (*p)->maximum_alignment();
+             if (max_align > abi_pagesize)
+               addr = align_address(addr, max_align);
              aligned_addr = addr;
 
              if (load_seg == *p)