Don't make dynamic .data.rel.ro SEC_READONLY

I'd made this dynamic section read-only so a flag test distinguished
it from .dynbss, but like any other .data.rel.ro section it really
should be marked read-write.  (It is read-only after relocation, not
before.)  When using the standard linker scripts this usually doesn't
matter since the output section is among other read-write sections and
not page aligned.  However, it might matter in the extraordinary case
of the dynamic section being the only .data.rel.ro section with the
output section just happening to be page aligned and a multiple of a
page in size.  In that case the output section would be read-only, and
live it its own read-only PT_LOAD segment, which is incorrect.

	* elflink.c (_bfd_elf_create_dynamic_sections): Don't make
	dynamic .data.rel.ro read-only.
	* elf32-arm.c (elf32_arm_finish_dynamic_symbol): Compare section
	rather than section flags when deciding where copy reloc goes.
	* elf32-cris.c (elf_cris_finish_dynamic_symbol): Likewise.
	* elf32-hppa.c (elf32_hppa_finish_dynamic_symbol): Likewise.
	* elf32-i386.c (elf_i386_finish_dynamic_symbol): Likewise.
	* elf32-metag.c (elf_metag_finish_dynamic_symbol): Likewise.
	* elf32-microblaze.c (microblaze_elf_finish_dynamic_symbol): Likewise.
	* elf32-nios2.c (nios2_elf32_finish_dynamic_symbol): Likewise.
	* elf32-or1k.c (or1k_elf_finish_dynamic_symbol): Likewise.
	* elf32-ppc.c (ppc_elf_finish_dynamic_symbol): Likewise.
	* elf32-s390.c (elf_s390_finish_dynamic_symbol): Likewise.
	* elf32-tic6x.c (elf32_tic6x_finish_dynamic_symbol): Likewise.
	* elf32-tilepro.c (tilepro_elf_finish_dynamic_symbol): Likewise.
	* elf64-ppc.c (ppc64_elf_finish_dynamic_symbol): Likewise.
	* elf64-s390.c (elf_s390_finish_dynamic_symbol): Likewise.
	* elf64-x86-64.c (elf_x86_64_finish_dynamic_symbol): Likewise.
	* elfnn-aarch64.c (elfNN_aarch64_finish_dynamic_symbol): Likewise.
	* elfnn-riscv.c (riscv_elf_finish_dynamic_symbol): Likewise.
	* elfxx-mips.c (_bfd_mips_vxworks_finish_dynamic_symbol): Likewise.
	* elfxx-sparc.c (_bfd_sparc_elf_finish_dynamic_symbol): Likewise.
	* elfxx-tilegx.c (tilegx_elf_finish_dynamic_symbol): Likewise.

22 files changed, 50 insertions, 25 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 652c074..29166e7 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,29 @@
+2017-02-28  Alan Modra  <amodra@gmail.com>
+
+	* elflink.c (_bfd_elf_create_dynamic_sections): Don't make
+	dynamic .data.rel.ro read-only.
+	* elf32-arm.c (elf32_arm_finish_dynamic_symbol): Compare section
+	rather than section flags when deciding where copy reloc goes.
+	* elf32-cris.c (elf_cris_finish_dynamic_symbol): Likewise.
+	* elf32-hppa.c (elf32_hppa_finish_dynamic_symbol): Likewise.
+	* elf32-i386.c (elf_i386_finish_dynamic_symbol): Likewise.
+	* elf32-metag.c (elf_metag_finish_dynamic_symbol): Likewise.
+	* elf32-microblaze.c (microblaze_elf_finish_dynamic_symbol): Likewise.
+	* elf32-nios2.c (nios2_elf32_finish_dynamic_symbol): Likewise.
+	* elf32-or1k.c (or1k_elf_finish_dynamic_symbol): Likewise.
+	* elf32-ppc.c (ppc_elf_finish_dynamic_symbol): Likewise.
+	* elf32-s390.c (elf_s390_finish_dynamic_symbol): Likewise.
+	* elf32-tic6x.c (elf32_tic6x_finish_dynamic_symbol): Likewise.
+	* elf32-tilepro.c (tilepro_elf_finish_dynamic_symbol): Likewise.
+	* elf64-ppc.c (ppc64_elf_finish_dynamic_symbol): Likewise.
+	* elf64-s390.c (elf_s390_finish_dynamic_symbol): Likewise.
+	* elf64-x86-64.c (elf_x86_64_finish_dynamic_symbol): Likewise.
+	* elfnn-aarch64.c (elfNN_aarch64_finish_dynamic_symbol): Likewise.
+	* elfnn-riscv.c (riscv_elf_finish_dynamic_symbol): Likewise.
+	* elfxx-mips.c (_bfd_mips_vxworks_finish_dynamic_symbol): Likewise.
+	* elfxx-sparc.c (_bfd_sparc_elf_finish_dynamic_symbol): Likewise.
+	* elfxx-tilegx.c (tilegx_elf_finish_dynamic_symbol): Likewise.
+
 2017-02-28  Maciej W. Rozycki  <macro@imgtec.com>
 
 	* elfxx-mips.c (mips_elf_perform_relocation): Also handle the
diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c
index 8171b0b..0a78595 100644
--- a/bfd/elf32-arm.c
+++ b/bfd/elf32-arm.c
@@ -16311,7 +16311,7 @@ elf32_arm_finish_dynamic_symbol (bfd * output_bfd,
 		      + h->root.u.def.section->output_section->vma
 		      + h->root.u.def.section->output_offset);
       rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY);
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->root.sdynrelro)
 	s = htab->root.sreldynrelro;
       else
 	s = htab->root.srelbss;
diff --git a/bfd/elf32-cris.c b/bfd/elf32-cris.c
index a69c7e4..97b8cc3 100644
--- a/bfd/elf32-cris.c
+++ b/bfd/elf32-cris.c
@@ -2275,7 +2275,7 @@ elf_cris_finish_dynamic_symbol (bfd *output_bfd,
 		  && (h->root.type == bfd_link_hash_defined
 		      || h->root.type == bfd_link_hash_defweak));
 
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->root.sdynrelro)
 	s = htab->root.sreldynrelro;
       else
 	s = htab->root.srelbss;
diff --git a/bfd/elf32-hppa.c b/bfd/elf32-hppa.c
index d5b911c..1deebf4 100644
--- a/bfd/elf32-hppa.c
+++ b/bfd/elf32-hppa.c
@@ -4432,7 +4432,7 @@ elf32_hppa_finish_dynamic_symbol (bfd *output_bfd,
 		      + eh->root.u.def.section->output_section->vma);
       rela.r_addend = 0;
       rela.r_info = ELF32_R_INFO (eh->dynindx, R_PARISC_COPY);
-      if ((eh->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (eh->root.u.def.section == htab->etab.sdynrelro)
 	sec = htab->etab.sreldynrelro;
       else
 	sec = htab->etab.srelbss;
diff --git a/bfd/elf32-i386.c b/bfd/elf32-i386.c
index e6e70d8..2784ef7 100644
--- a/bfd/elf32-i386.c
+++ b/bfd/elf32-i386.c
@@ -5666,7 +5666,7 @@ do_glob_dat:
 		      + h->root.u.def.section->output_section->vma
 		      + h->root.u.def.section->output_offset);
       rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->elf.sdynrelro)
 	s = htab->elf.sreldynrelro;
       else
 	s = htab->elf.srelbss;
diff --git a/bfd/elf32-metag.c b/bfd/elf32-metag.c
index 40a2baf..c45d719 100644
--- a/bfd/elf32-metag.c
+++ b/bfd/elf32-metag.c
@@ -3229,7 +3229,7 @@ elf_metag_finish_dynamic_symbol (bfd *output_bfd,
 		      + eh->root.u.def.section->output_section->vma);
       rel.r_addend = 0;
       rel.r_info = ELF32_R_INFO (eh->dynindx, R_METAG_COPY);
-      if ((eh->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (eh->root.u.def.section == htab->etab.sdynrelro)
 	s = htab->etab.sreldynrelro;
       else
 	s = htab->etab.srelbss;
diff --git a/bfd/elf32-microblaze.c b/bfd/elf32-microblaze.c
index 27118c1..325a0d6 100644
--- a/bfd/elf32-microblaze.c
+++ b/bfd/elf32-microblaze.c
@@ -3277,7 +3277,7 @@ microblaze_elf_finish_dynamic_symbol (bfd *output_bfd,
                        + h->root.u.def.section->output_offset);
       rela.r_info = ELF32_R_INFO (h->dynindx, R_MICROBLAZE_COPY);
       rela.r_addend = 0;
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->elf.sdynrelro)
 	s = htab->elf.sreldynrelro;
       else
 	s = htab->elf.srelbss;
diff --git a/bfd/elf32-nios2.c b/bfd/elf32-nios2.c
index 3e4706f..d07ef67 100644
--- a/bfd/elf32-nios2.c
+++ b/bfd/elf32-nios2.c
@@ -5280,7 +5280,7 @@ nios2_elf32_finish_dynamic_symbol (bfd *output_bfd,
 		       + h->root.u.def.section->output_offset);
       rela.r_info = ELF32_R_INFO (h->dynindx, R_NIOS2_COPY);
       rela.r_addend = 0;
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->root.sdynrelro)
 	s = htab->root.sreldynrelro;
       else
 	s = htab->root.srelbss;
diff --git a/bfd/elf32-or1k.c b/bfd/elf32-or1k.c
index 8e0ef72..224cbb8 100644
--- a/bfd/elf32-or1k.c
+++ b/bfd/elf32-or1k.c
@@ -1949,7 +1949,7 @@ or1k_elf_finish_dynamic_symbol (bfd *output_bfd,
                        + h->root.u.def.section->output_offset);
       rela.r_info = ELF32_R_INFO (h->dynindx, R_OR1K_COPY);
       rela.r_addend = 0;
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->root.sdynrelro)
 	s = htab->root.sreldynrelro;
       else
 	s = htab->root.srelbss;
diff --git a/bfd/elf32-ppc.c b/bfd/elf32-ppc.c
index e71757e..834ef67 100644
--- a/bfd/elf32-ppc.c
+++ b/bfd/elf32-ppc.c
@@ -10355,7 +10355,7 @@ ppc_elf_finish_dynamic_symbol (bfd *output_bfd,
 
       if (ppc_elf_hash_entry (h)->has_sda_refs)
 	s = htab->relsbss;
-      else if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      else if (h->root.u.def.section == htab->elf.sdynrelro)
 	s = htab->elf.sreldynrelro;
       else
 	s = htab->elf.srelbss;
diff --git a/bfd/elf32-s390.c b/bfd/elf32-s390.c
index e5cb3b4..fd1bc13 100644
--- a/bfd/elf32-s390.c
+++ b/bfd/elf32-s390.c
@@ -3827,7 +3827,7 @@ elf_s390_finish_dynamic_symbol (bfd *output_bfd,
 		       + h->root.u.def.section->output_offset);
       rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
       rela.r_addend = 0;
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->elf.sdynrelro)
 	s = htab->elf.sreldynrelro;
       else
 	s = htab->elf.srelbss;
diff --git a/bfd/elf32-tic6x.c b/bfd/elf32-tic6x.c
index 08361d9..f65e24f 100644
--- a/bfd/elf32-tic6x.c
+++ b/bfd/elf32-tic6x.c
@@ -1876,7 +1876,7 @@ elf32_tic6x_finish_dynamic_symbol (bfd * output_bfd,
 		      + h->root.u.def.section->output_offset);
       rel.r_info = ELF32_R_INFO (h->dynindx, R_C6000_COPY);
       rel.r_addend = 0;
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->elf.sdynrelro)
 	s = htab->elf.sreldynrelro;
       else
 	s = htab->elf.srelbss;
diff --git a/bfd/elf32-tilepro.c b/bfd/elf32-tilepro.c
index 660b112..fb06a47 100644
--- a/bfd/elf32-tilepro.c
+++ b/bfd/elf32-tilepro.c
@@ -3813,7 +3813,7 @@ tilepro_elf_finish_dynamic_symbol (bfd *output_bfd,
 		       + h->root.u.def.section->output_offset);
       rela.r_info = ELF32_R_INFO (h->dynindx, R_TILEPRO_COPY);
       rela.r_addend = 0;
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->elf.sdynrelro)
 	s = htab->elf.sreldynrelro;
       else
 	s = htab->elf.srelbss;
diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c
index 4d90e0a..7b8bacf 100644
--- a/bfd/elf64-ppc.c
+++ b/bfd/elf64-ppc.c
@@ -15477,7 +15477,7 @@ ppc64_elf_finish_dynamic_symbol (bfd *output_bfd,
 		       + h->root.u.def.section->output_offset);
       rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_COPY);
       rela.r_addend = 0;
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->elf.sdynrelro)
 	srel = htab->elf.sreldynrelro;
       else
 	srel = htab->elf.srelbss;
diff --git a/bfd/elf64-s390.c b/bfd/elf64-s390.c
index edc9b86..b5fd05f 100644
--- a/bfd/elf64-s390.c
+++ b/bfd/elf64-s390.c
@@ -3623,7 +3623,7 @@ elf_s390_finish_dynamic_symbol (bfd *output_bfd,
 		       + h->root.u.def.section->output_offset);
       rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
       rela.r_addend = 0;
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->elf.sdynrelro)
 	s = htab->elf.sreldynrelro;
       else
 	s = htab->elf.srelbss;
diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c
index a058eca..e0e6c16 100644
--- a/bfd/elf64-x86-64.c
+++ b/bfd/elf64-x86-64.c
@@ -6189,7 +6189,7 @@ do_glob_dat:
 		       + h->root.u.def.section->output_offset);
       rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
       rela.r_addend = 0;
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->elf.sdynrelro)
 	s = htab->elf.sreldynrelro;
       else
 	s = htab->elf.srelbss;
diff --git a/bfd/elflink.c b/bfd/elflink.c
index 027ce83..776357f 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -424,7 +424,7 @@ _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
 	 initialize them at run time.  The linker script puts the .dynbss
 	 section into the .bss section of the final image.  */
       s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
-					      (SEC_ALLOC | SEC_LINKER_CREATED));
+					      SEC_ALLOC | SEC_LINKER_CREATED);
       if (s == NULL)
 	return FALSE;
       htab->sdynbss = s;
@@ -432,11 +432,10 @@ _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
       if (bed->want_dynrelro)
 	{
 	  /* Similarly, but for symbols that were originally in read-only
-	     sections.  */
+	     sections.  This section doesn't really need to have contents,
+	     but make it like other .data.rel.ro sections.  */
 	  s = bfd_make_section_anyway_with_flags (abfd, ".data.rel.ro",
-						  (SEC_ALLOC | SEC_READONLY
-						   | SEC_HAS_CONTENTS
-						   | SEC_LINKER_CREATED));
+						  flags);
 	  if (s == NULL)
 	    return FALSE;
 	  htab->sdynrelro = s;
diff --git a/bfd/elfnn-aarch64.c b/bfd/elfnn-aarch64.c
index c86a3e1..dfba7f7 100644
--- a/bfd/elfnn-aarch64.c
+++ b/bfd/elfnn-aarch64.c
@@ -8988,7 +8988,7 @@ do_glob_dat:
 		       + h->root.u.def.section->output_offset);
       rela.r_info = ELFNN_R_INFO (h->dynindx, AARCH64_R (COPY));
       rela.r_addend = 0;
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->root.sdynrelro)
 	s = htab->root.sreldynrelro;
       else
 	s = htab->root.srelbss;
diff --git a/bfd/elfnn-riscv.c b/bfd/elfnn-riscv.c
index 2ccfc5f..e476bb1 100644
--- a/bfd/elfnn-riscv.c
+++ b/bfd/elfnn-riscv.c
@@ -2412,7 +2412,7 @@ riscv_elf_finish_dynamic_symbol (bfd *output_bfd,
       rela.r_offset = sec_addr (h->root.u.def.section) + h->root.u.def.value;
       rela.r_info = ELFNN_R_INFO (h->dynindx, R_RISCV_COPY);
       rela.r_addend = 0;
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->elf.sdynrelro)
 	s = htab->elf.sreldynrelro;
       else
 	s = htab->elf.srelbss;
diff --git a/bfd/elfxx-mips.c b/bfd/elfxx-mips.c
index 7a1d5f8..901ddc1 100644
--- a/bfd/elfxx-mips.c
+++ b/bfd/elfxx-mips.c
@@ -11173,7 +11173,7 @@ _bfd_mips_vxworks_finish_dynamic_symbol (bfd *output_bfd,
 		      + h->root.u.def.value);
       rel.r_info = ELF32_R_INFO (h->dynindx, R_MIPS_COPY);
       rel.r_addend = 0;
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->root.sdynrelro)
 	srel = htab->root.sreldynrelro;
       else
 	srel = htab->root.srelbss;
diff --git a/bfd/elfxx-sparc.c b/bfd/elfxx-sparc.c
index f66525e..80fda1b 100644
--- a/bfd/elfxx-sparc.c
+++ b/bfd/elfxx-sparc.c
@@ -4568,7 +4568,7 @@ _bfd_sparc_elf_finish_dynamic_symbol (bfd *output_bfd,
 		       + h->root.u.def.section->output_offset);
       rela.r_info = SPARC_ELF_R_INFO (htab, NULL, h->dynindx, R_SPARC_COPY);
       rela.r_addend = 0;
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->elf.sdynrelro)
 	s = htab->elf.sreldynrelro;
       else
 	s = htab->elf.srelbss;
diff --git a/bfd/elfxx-tilegx.c b/bfd/elfxx-tilegx.c
index eb12695..76dfcd8 100644
--- a/bfd/elfxx-tilegx.c
+++ b/bfd/elfxx-tilegx.c
@@ -4198,7 +4198,7 @@ tilegx_elf_finish_dynamic_symbol (bfd *output_bfd,
       /* This symbols needs a copy reloc.  Set it up.  */
       BFD_ASSERT (h->dynindx != -1);
 
-      if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+      if (h->root.u.def.section == htab->elf.sdynrelro)
 	s = htab->elf.sreldynrelro;
       else
 	s = htab->elf.srelbss;