* options.h (class General_options): Add -z relro.

	* layout.cc (Layout::Layout): Initialize relro_segment_.
	(Layout::add_output_section_data): Return the output section.
	(Layout::make_output_section): Rcognize relro sections and mark
	them appropriately.
	(Layout::attach_allocated_section_to_segment): Put relro sections
	in a PT_GNU_RELRO segment.
	(Layout::create_initial_dynamic_sections): Mark the .dynamic
	section as relro.
	(Layout::segment_precedes): Sort PT_GNU_RELRO segments after
	PT_TLS segments.
	(Layout::linkonce_mapping): Map d.rel.ro.local to
	.data.rel.ro.local.
	(Layout::output_section_name): Us .data.rel.ro.local for any
	section which begins with that.
	* layout.h (class Layout): Update add_output_section_data
	declaration.  Add relro_segment_ field.
	* output.cc (Output_section::Output_section): Initialize is_relro_
	and is_relro_local_ fields.
	(Output_segment::add_output_section): Group relro sections.
	(Output_segment::is_first_section_relro): New function.
	(Output_segment::maximum_alignment): If there is a relro section,
	align the segment to the common page size.
	(Output_segment::set_section_addresses): Track whether we are
	looking at relro sections.  If the last section is a relro
	section, align to the common page size.
	(Output_segment::set_section_list_addresses): Add in_relro
	parameter.  Change all callers.  Align to the page size when
	moving from relro to non-relro section.
	(Output_segment::set_offset): Align memsz of a PT_GNU_RELRO
	segment.
	* output.h (class Output_section): Add is_relro_ and
	is_relro_local_ fields.
	(Output_section::is_relro): New function.
	(Output_section::set_is_relro): New function.
	(Output_section::is_relro_local): New function.
	(Output_section::set_is_relro_local): New function.
	(class Output_segment): Update declarations.
	* i386.cc (Target_i386::got_section): Mark .got section as relro.
	* sparc.cc (Target_sparc::got_section): Likewise.
	* x86_64.cc (Target_x86_64::got_section): Likewise.
	* testsuite/relro_test_main.cc: New file.
	* testsuite/relro_test.cc: New file.
	* testsuite/Makefile.am (check_PROGRAMS): Add relro_test.
	(relro_test_SOURCES, relro_test_DEPENDENCIES): New variables.
	(relro_test_LDFLAGS, relro_test_LDADD): New variables.
	(relro_test.so, relro_test_pic.o): New targets.
	* testsuite/Makefile.in: Rebuild.

1 files changed, 11 insertions, 6 deletions

diff --git a/gold/i386.cc b/gold/i386.cc
index 1d04f4f..4785fa6 100644
--- a/gold/i386.cc
+++ b/gold/i386.cc
@@ -426,18 +426,23 @@ Target_i386::got_section(Symbol_table* symtab, Layout* layout)
 
       this->got_ = new Output_data_got<32, false>();
 
-      layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
-				      elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
-				      this->got_);
+      Output_section* os;
+      os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
+					   (elfcpp::SHF_ALLOC
+					    | elfcpp::SHF_WRITE),
+					   this->got_);
+      os->set_is_relro();
 
       // The old GNU linker creates a .got.plt section.  We just
       // create another set of data in the .got section.  Note that we
       // always create a PLT if we create a GOT, although the PLT
       // might be empty.
       this->got_plt_ = new Output_data_space(4);
-      layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
-				      elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
-				      this->got_plt_);
+      os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
+					   (elfcpp::SHF_ALLOC
+					    | elfcpp::SHF_WRITE),
+					   this->got_plt_);
+      os->set_is_relro();
 
       // The first three entries are reserved.
       this->got_plt_->set_current_data_size(3 * 4);