From 49ba15a23a9d3d8a109ce2fd5053822eee7f1fdf Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Fri, 28 Jul 2017 13:39:42 -0700
Subject: gold: Add put_ch_reserved to 64-bit Chdr_write

The 64-bit ELF compression header has a reserved field.  It should be
cleared to avoid random bits in it.

elfcpp/

	PR gold/21857
	* elfcpp.h (Chdr_write): Add put_ch_reserved.
	(Chdr_write<64, true>::put_ch_reserved): New.
	(Chdr_write<64, false>::put_ch_reserved): Likewise.

gold/

	PR gold/21857
	* compressed_output.cc (Output_compressed_section::set_final_data_size):
	Call put_ch_reserved to clear the reserved field for 64-bit ELF.
---
 elfcpp/ChangeLog |  7 +++++++
 elfcpp/elfcpp.h  | 17 +++++++++++++++++
 2 files changed, 24 insertions(+)

(limited to 'elfcpp')

diff --git a/elfcpp/ChangeLog b/elfcpp/ChangeLog
index fc864bf..f669248 100644
--- a/elfcpp/ChangeLog
+++ b/elfcpp/ChangeLog
@@ -1,3 +1,10 @@
+2017-07-28  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR gold/21857
+	* elfcpp.h (Chdr_write): Add put_ch_reserved.
+	(Chdr_write<64, true>::put_ch_reserved): New.
+	(Chdr_write<64, false>::put_ch_reserved): Likewise.
+
 2017-07-03  Alan Modra  <amodra@gmail.com>
 
 	* dwarf.h (DW_FIRST_IDX, DW_IDX, DW_IDX_DUP, DW_END_IDX): Define,
diff --git a/elfcpp/elfcpp.h b/elfcpp/elfcpp.h
index a57f547..cccec4c 100644
--- a/elfcpp/elfcpp.h
+++ b/elfcpp/elfcpp.h
@@ -1351,10 +1351,27 @@ class Chdr_write
   put_ch_addralign(typename Elf_types<size>::Elf_WXword v)
   { this->p_->ch_addralign = Convert<size, big_endian>::convert_host(v); }
 
+  void
+  put_ch_reserved(Elf_Word);
+
  private:
   internal::Chdr_data<size>* p_;
 };
 
+template<>
+inline void
+elfcpp::Chdr_write<64, true>::put_ch_reserved(Elf_Word v)
+{
+  this->p_->ch_reserved = v;
+}
+
+template<>
+inline void
+elfcpp::Chdr_write<64, false>::put_ch_reserved(Elf_Word v)
+{
+  this->p_->ch_reserved = v;
+}
+
 // Accessor class for an ELF segment header.
 
 template<int size, bool big_endian>
-- 
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