Disallow copy relocation against protected data symbol

We shpouldn't generate copy relocation to resolve reference to protected
data symbol defined in shared object with the NO_COPY_ON_PROTECTED
property.  This patch adds a bit to elf_obj_tdata as well as
elf_i386_link_hash_entry and elf_x86_64_link_hash_entry to track the bfd
with the NO_COPY_ON_PROTECTED property as well as protected symbol
defined in shared object.  extern_protected_data is set to FALSE if any
input relocatable file contains the NO_COPY_ON_PROTECTED property.

bfd/

	PR ld/21997
	* elf-bfd.h (elf_obj_tdata): Use ENUM_BITFIELD on object_id,
	dyn_lib_class and has_gnu_symbols.  Change bad_symtab to bitfield.
	Add a has_no_copy_on_protected bitfield.
	(elf_has_no_copy_on_protected): New.
	* elf-properties.c (_bfd_elf_parse_gnu_properties): Set
	elf_has_no_copy_on_protected for GNU_PROPERTY_NO_COPY_ON_PROTECTED.
	(elf_merge_gnu_property_list): Likewise.
	(_bfd_elf_link_setup_gnu_properties): Set extern_protected_data
	to FALSE for elf_has_no_copy_on_protected.
	* elf32-i386.c (SYMBOL_NO_COPYRELOC): New.
	(elf_i386_link_hash_entry): Add def_protected.
	(elf_i386_adjust_dynamic_symbol): Also check SYMBOL_NO_COPYRELOC
	when checking info->nocopyreloc.
	(elf_i386_link_setup_gnu_properties): Don't set
	extern_protected_data here.
	(elf_i386_merge_symbol_attribute): New function.
	(elf_backend_merge_symbol_attribute): New.
	* elf64-x86-64.c (SYMBOL_NO_COPYRELOC): New.
	(elf_x86_64_link_hash_entry): Add def_protected.
	(elf_x86_64_need_pic): Report protected symbol for def_protected.
	(elf_x86_64_adjust_dynamic_symbol): Also check SYMBOL_NO_COPYRELOC
	when checking info->nocopyreloc.
	(elf_x86_64_relocate_section): Also check for R_X86_64_PC32
	relocation run-time overflow and unresolvable R_X86_64_32S
	relocation against protected data symbol defined in shared object
	with GNU_PROPERTY_NO_COPY_ON_PROTECTED.
	(elf_x86_64_link_setup_gnu_properties): Don't set
	extern_protected_data here.
	(elf_x86_64_merge_symbol_attribute): New function.
	(elf_backend_merge_symbol_attribute): New.

ld/

	PR ld/21997
	* testsuite/ld-i386/i386.exp: Run PR ld/21997 tests.
	* testsuite/ld-x86-64/x86-64.exp: Likewise.
	* testsuite/ld-i386/pr21997-1a.S: New file.
	* testsuite/ld-i386/pr21997-1b.c: Likewise.
	* testsuite/ld-i386/pr21997-1c.S: Likewise.
	* testsuite/ld-x86-64/pr21997-1a.S: Likewise.
	* testsuite/ld-x86-64/pr21997-1a.err: Likewise.
	* testsuite/ld-x86-64/pr21997-1b.c: Likewise.
	* testsuite/ld-x86-64/pr21997-1b.err: Likewise.
	* testsuite/ld-x86-64/pr21997-1c.c: Likewise.

4 files changed, 153 insertions, 0 deletions

diff --git a/ld/testsuite/ld-i386/i386.exp b/ld/testsuite/ld-i386/i386.exp
index c813a80..bd15610 100644
--- a/ld/testsuite/ld-i386/i386.exp
+++ b/ld/testsuite/ld-i386/i386.exp
@@ -1254,6 +1254,14 @@ if { [isnative]
 	    {} \
 	    "pr22001-1.so" \
 	] \
+	[list \
+	    "Build pr21997-1.so" \
+	    "-shared" \
+	    "" \
+	    { property-stack.S property-no-copy.S pr21997-1a.S } \
+	    {} \
+	    "pr21997-1.so" \
+	] \
     ]
 
     run_ld_link_exec_tests [list \
@@ -1309,6 +1317,49 @@ if { [isnative]
 	    "pass.out" \
 	    "-fPIC" \
 	] \
+	[list \
+	    "Run pr21997-1" \
+	    "$NOPIE_LDFLAGS -Wl,--no-as-needed tmpdir/pr21997-1.so" \
+	    "" \
+	    { pr21997-1b.c } \
+	    "pr21997-1" \
+	    "pass.out" \
+	    "$NOPIE_CFLAGS" \
+	] \
+	[list \
+	    "Run pr21997-1 (PIC 1)" \
+	    "$NOPIE_LDFLAGS -Wl,--no-as-needed tmpdir/pr21997-1.so" \
+	    "" \
+	    { pr21997-1b.c } \
+	    "pr21997-1-pic-1" \
+	    "pass.out" \
+	    "-fPIC" \
+	] \
+	[list \
+	    "Run pr21997-1 (PIC 2)" \
+	    "-pie -Wl,--no-as-needed tmpdir/pr21997-1.so" \
+	    "" \
+	    { pr21997-1b.c } \
+	    "pr21997-1-pic-2" \
+	    "pass.out" \
+	    "-fPIC" \
+	] \
+	[list \
+	    "Run pr21997-1 (PIE 1)" \
+	    "$NOPIE_LDFLAGS -Wl,--no-as-needed tmpdir/pr21997-1.so" \
+	    "" \
+	    { pr21997-1c.S } \
+	    "pr21997-1-pie-1" \
+	    "pass.out" \
+	] \
+	[list \
+	    "Run pr21997-1 (PIE 2)" \
+	    "-pie -Wl,--no-as-needed tmpdir/pr21997-1.so" \
+	    "" \
+	    { pr21997-1c.S } \
+	    "pr21997-1-pie-2" \
+	    "pass.out" \
+	] \
     ]
 
     if { [at_least_gcc_version 5 0] } {
diff --git a/ld/testsuite/ld-i386/pr21997-1a.S b/ld/testsuite/ld-i386/pr21997-1a.S
new file mode 100644
index 0000000..aea17f8
--- /dev/null
+++ b/ld/testsuite/ld-i386/pr21997-1a.S
@@ -0,0 +1,35 @@
+	.text
+	.p2align 4,,15
+	.globl	get_protected
+	.type	get_protected, @function
+get_protected:
+	call	__x86.get_pc_thunk.ax
+	addl	$_GLOBAL_OFFSET_TABLE_, %eax
+	movl	protected@GOTOFF(%eax), %eax
+	ret
+	.size	get_protected, .-get_protected
+	.p2align 4,,15
+	.globl	get_protected_p
+	.type	get_protected_p, @function
+get_protected_p:
+	call	__x86.get_pc_thunk.ax
+	addl	$_GLOBAL_OFFSET_TABLE_, %eax
+	leal	protected@GOTOFF(%eax), %eax
+	ret
+	.size	get_protected_p, .-get_protected_p
+	.protected	protected
+	.globl	protected
+	.data
+	.align 4
+	.type	protected, @object
+	.size	protected, 4
+protected:
+	.long	1
+	.section	.text.__x86.get_pc_thunk.ax,"axG",@progbits,__x86.get_pc_thunk.ax,comdat
+	.globl	__x86.get_pc_thunk.ax
+	.hidden	__x86.get_pc_thunk.ax
+	.type	__x86.get_pc_thunk.ax, @function
+__x86.get_pc_thunk.ax:
+	movl	(%esp), %eax
+	ret
+	.section	.note.GNU-stack,"",@progbits
diff --git a/ld/testsuite/ld-i386/pr21997-1b.c b/ld/testsuite/ld-i386/pr21997-1b.c
new file mode 100644
index 0000000..576362e
--- /dev/null
+++ b/ld/testsuite/ld-i386/pr21997-1b.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+extern int protected;
+extern int get_protected (void);
+extern int* get_protected_p (void);
+
+int
+main ()
+{
+
+  if (protected == get_protected ()
+      && &protected == get_protected_p ())
+    printf ("PASS\n");
+
+  return 0;
+}
diff --git a/ld/testsuite/ld-i386/pr21997-1c.S b/ld/testsuite/ld-i386/pr21997-1c.S
new file mode 100644
index 0000000..8534877
--- /dev/null
+++ b/ld/testsuite/ld-i386/pr21997-1c.S
@@ -0,0 +1,51 @@
+	.section	.rodata.str1.1,"aMS",@progbits,1
+.LC0:
+	.string	"PASS"
+	.section	.text.startup,"ax",@progbits
+	.p2align 4,,15
+	.globl	main
+	.type	main, @function
+main:
+	leal	4(%esp), %ecx
+	andl	$-16, %esp
+	pushl	-4(%ecx)
+	pushl	%ebp
+	movl	%esp, %ebp
+	pushl	%esi
+	pushl	%ebx
+	pushl	%ecx
+	call	__x86.get_pc_thunk.bx
+	addl	$_GLOBAL_OFFSET_TABLE_, %ebx
+	subl	$12, %esp
+	call	get_protected@PLT
+	movl	protected@GOT(%ebx), %esi
+	cmpl	(%esi), %eax
+	je	.L7
+.L3:
+	leal	-12(%ebp), %esp
+	xorl	%eax, %eax
+	popl	%ecx
+	popl	%ebx
+	popl	%esi
+	popl	%ebp
+	leal	-4(%ecx), %esp
+	ret
+.L7:
+	call	get_protected_p@PLT
+	cmpl	%esi, %eax
+	jne	.L3
+	leal	.LC0@GOTOFF(%ebx), %eax
+	subl	$12, %esp
+	pushl	%eax
+	call	puts@PLT
+	addl	$16, %esp
+	jmp	.L3
+	.size	main, .-main
+	.section	.text.__x86.get_pc_thunk.bx,"axG",@progbits,__x86.get_pc_thunk.bx,comdat
+	.globl	__x86.get_pc_thunk.bx
+	.hidden	__x86.get_pc_thunk.bx
+	.type	__x86.get_pc_thunk.bx, @function
+__x86.get_pc_thunk.bx:
+	movl	(%esp), %ebx
+	ret
+	.section	.note.GNU-stack,"",@progbits