Don't allow COPY relocations for protected symbols.

gold/
	PR gold/19823
	* copy-relocs.cc (Copy_relocs::make_copy_reloc): Add object
	parameter; check for protected symbol.
	* copy-relocs.h (Copy_relocs::make_copy_reloc): Add object parameter.
	* mips.cc (Mips_copy_relocs): Adjust call to make_copy_reloc.
	* symtab.cc (Symbol::init_fields): Initialize is_protected_.
	(Symbol_table::add_from_dynobj): Mark protected symbols.
	* symtab.h (Symbol::is_protected): New method.
	(Symbol::set_is_protected): New method.
	(Symbol::is_protected_): New data member.

	* testsuite/Makefile.am (copy_test_protected): New test.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/copy_test.cc (main): Add legal reference to protected
	symbol.
	* testsuite/copy_test_v1.cc (main): Likewise.
	* testsuite/copy_test_2.cc (ip): Add protected symbol.
	* testsuite/copy_test_protected.cc: New test source file.
	* testsuite/copy_test_protected.sh: New test script.

1 files changed, 14 insertions, 2 deletions

diff --git a/gold/copy-relocs.cc b/gold/copy-relocs.cc
index 32288c8..ce019c4 100644
--- a/gold/copy-relocs.cc
+++ b/gold/copy-relocs.cc
@@ -48,7 +48,7 @@ Copy_relocs<sh_type, size, big_endian>::copy_reloc(
     Output_data_reloc<sh_type, true, size, big_endian>* reloc_section)
 {
   if (this->need_copy_reloc(sym, object, shndx))
-    this->make_copy_reloc(symtab, layout, sym, reloc_section);
+    this->make_copy_reloc(symtab, layout, sym, object, reloc_section);
   else
     {
       // We may not need a COPY relocation.  Save this relocation to
@@ -111,11 +111,24 @@ Copy_relocs<sh_type, size, big_endian>::make_copy_reloc(
     Symbol_table* symtab,
     Layout* layout,
     Sized_symbol<size>* sym,
+    Sized_relobj_file<size, big_endian>* object,
     Output_data_reloc<sh_type, true, size, big_endian>* reloc_section)
 {
   // We should not be here if -z nocopyreloc is given.
   gold_assert(parameters->options().copyreloc());
 
+  gold_assert(sym->is_from_dynobj());
+
+  // The symbol must not have protected visibility.
+  if (sym->is_protected())
+    {
+      gold_error(_("%s: cannot make copy relocation for "
+		   "protected symbol '%s', defined in %s"),
+		 object->name().c_str(),
+		 sym->name(),
+		 sym->object()->name().c_str());
+    }
+
   typename elfcpp::Elf_types<size>::Elf_WXword symsize = sym->symsize();
 
   // There is no defined way to determine the required alignment of
@@ -124,7 +137,6 @@ Copy_relocs<sh_type, size, big_endian>::make_copy_reloc(
   // is defined; presumably we do not require an alignment larger than
   // that.  Then we reduce that alignment if the symbol is not aligned
   // within the section.
-  gold_assert(sym->is_from_dynobj());
   bool is_ordinary;
   unsigned int shndx = sym->shndx(&is_ordinary);
   gold_assert(is_ordinary);