mirror of
https://sourceware.org/git/binutils-gdb.git
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5474d94f03
Variables defined in shared libraries are copied into an executable's .bss section when code in the executable is non-PIC and thus would require dynamic text relocations to access the variable directly in the shared library. Recent x86 toolchains also copy variables into the executable to gain a small speed improvement. The problem is that if the variable was originally read-only, the copy in .bss is writable, potentially opening a security hole. This patch cures that problem by putting the copy in a section that becomes read-only after ld.so relocation, provided -z relro is in force. The patch also fixes a microblaze linker segfault on attempting to use dynamic bss variables. bfd/ PR ld/20995 * elf-bfd.h (struct elf_link_hash_table): Add sdynrelro and sreldynrelro. (struct elf_backend_data): Add want_dynrelro. * elfxx-target.h (elf_backend_want_dynrelro): Define. (elfNN_bed): Update initializer. * elflink.c (_bfd_elf_create_dynamic_sections): Create sdynrelro and sreldynrelro sections. * elf32-arm.c (elf32_arm_adjust_dynamic_symbol): Place variables copied into the executable from read-only sections into sdynrelro. (elf32_arm_size_dynamic_sections): Handle sdynrelro. (elf32_arm_finish_dynamic_symbol): Select sreldynrelro for dynamic relocs in sdynrelro. (elf_backend_want_dynrelro): Define. * elf32-hppa.c (elf32_hppa_adjust_dynamic_symbol) (elf32_hppa_size_dynamic_sections, elf32_hppa_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-i386.c (elf_i386_adjust_dynamic_symbol) (elf_i386_size_dynamic_sections, elf_i386_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-metag.c (elf_metag_adjust_dynamic_symbol) (elf_metag_size_dynamic_sections, elf_metag_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-microblaze.c (microblaze_elf_adjust_dynamic_symbol) (microblaze_elf_size_dynamic_sections) (microblaze_elf_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-nios2.c (nios2_elf32_finish_dynamic_symbol) (nios2_elf32_adjust_dynamic_symbol) (nios2_elf32_size_dynamic_sections) (elf_backend_want_dynrelro): As above. * elf32-or1k.c (or1k_elf_finish_dynamic_symbol) (or1k_elf_adjust_dynamic_symbol, or1k_elf_size_dynamic_sections) (elf_backend_want_dynrelro): As above. * elf32-ppc.c (ppc_elf_adjust_dynamic_symbol) (ppc_elf_size_dynamic_sections, ppc_elf_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-s390.c (elf_s390_adjust_dynamic_symbol) (elf_s390_size_dynamic_sections, elf_s390_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-tic6x.c (elf32_tic6x_adjust_dynamic_symbol) (elf32_tic6x_size_dynamic_sections) (elf32_tic6x_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-tilepro.c (tilepro_elf_adjust_dynamic_symbol) (tilepro_elf_size_dynamic_sections) (tilepro_elf_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf64-ppc.c (ppc64_elf_adjust_dynamic_symbol) (ppc64_elf_size_dynamic_sections, ppc64_elf_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf64-s390.c (elf_s390_adjust_dynamic_symbol) (elf_s390_size_dynamic_sections, elf_s390_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf64-x86-64.c (elf_x86_64_adjust_dynamic_symbol) (elf_x86_64_size_dynamic_sections) (elf_x86_64_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elfnn-aarch64.c (elfNN_aarch64_adjust_dynamic_symbol) (elfNN_aarch64_size_dynamic_sections) (elfNN_aarch64_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elfnn-riscv.c (riscv_elf_adjust_dynamic_symbol) (riscv_elf_size_dynamic_sections, riscv_elf_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elfxx-mips.c (_bfd_mips_elf_adjust_dynamic_symbol) (_bfd_mips_elf_size_dynamic_sections) (_bfd_mips_vxworks_finish_dynamic_symbol): As above. * elfxx-sparc.c (_bfd_sparc_elf_adjust_dynamic_symbol) (_bfd_sparc_elf_size_dynamic_sections) (_bfd_sparc_elf_finish_dynamic_symbol): As above. * elfxx-tilegx.c (tilegx_elf_adjust_dynamic_symbol) (tilegx_elf_size_dynamic_sections) (tilegx_elf_finish_dynamic_symbol): As above. * elf32-mips.c (elf_backend_want_dynrelro): Define. * elf64-mips.c (elf_backend_want_dynrelro): Define. * elf32-sparc.c (elf_backend_want_dynrelro): Define. * elf64-sparc.c (elf_backend_want_dynrelro): Define. * elf32-tilegx.c (elf_backend_want_dynrelro): Define. * elf64-tilegx.c (elf_backend_want_dynrelro): Define. * elf32-microblaze.c (microblaze_elf_adjust_dynamic_symbol): Tidy. (microblaze_elf_size_dynamic_sections): Handle sdynbss. * elf32-nios2.c (nios2_elf32_size_dynamic_sections): Make use of linker shortcuts to dynamic sections rather than comparing names. Correctly set "got" flag. ld/ PR ld/20995 * testsuite/ld-arm/farcall-mixed-app-v5.d: Update to suit changed stub hash table traversal caused by section id increment. Accept the previous output too. * testsuite/ld-arm/farcall-mixed-app.d: Likewise. * testsuite/ld-arm/farcall-mixed-lib-v4t.d: Likewise. * testsuite/ld-arm/farcall-mixed-lib.d: Likewise. * testsuite/ld-elf/pr20995a.s, * testsuite/ld-elf/pr20995b.s, * testsuite/ld-elf/pr20995.r: New test. * testsuite/ld-elf/elf.exp: Run it.
358 lines
11 KiB
C
358 lines
11 KiB
C
/* SPARC-specific support for 32-bit ELF
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Copyright (C) 1993-2016 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "bfdlink.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/sparc.h"
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#include "opcode/sparc.h"
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#include "elfxx-sparc.h"
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#include "elf-vxworks.h"
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/* Support for core dump NOTE sections. */
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static bfd_boolean
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elf32_sparc_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
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{
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switch (note->descsz)
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{
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default:
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return FALSE;
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case 260: /* Solaris prpsinfo_t. */
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elf_tdata (abfd)->core->program
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= _bfd_elfcore_strndup (abfd, note->descdata + 84, 16);
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elf_tdata (abfd)->core->command
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= _bfd_elfcore_strndup (abfd, note->descdata + 100, 80);
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break;
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case 336: /* Solaris psinfo_t. */
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elf_tdata (abfd)->core->program
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= _bfd_elfcore_strndup (abfd, note->descdata + 88, 16);
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elf_tdata (abfd)->core->command
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= _bfd_elfcore_strndup (abfd, note->descdata + 104, 80);
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break;
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}
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return TRUE;
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}
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/* Functions for dealing with the e_flags field.
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We don't define set_private_flags or copy_private_bfd_data because
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the only currently defined values are based on the bfd mach number,
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so we use the latter instead and defer setting e_flags until the
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file is written out. */
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/* Merge backend specific data from an object file to the output
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object file when linking. */
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static bfd_boolean
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elf32_sparc_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
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{
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bfd *obfd = info->output_bfd;
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bfd_boolean error;
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unsigned long ibfd_mach;
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/* FIXME: This should not be static. */
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static unsigned long previous_ibfd_e_flags = (unsigned long) -1;
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if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
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|| bfd_get_flavour (obfd) != bfd_target_elf_flavour)
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return TRUE;
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error = FALSE;
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ibfd_mach = bfd_get_mach (ibfd);
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if (bfd_mach_sparc_64bit_p (ibfd_mach))
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{
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error = TRUE;
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_bfd_error_handler
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(_("%B: compiled for a 64 bit system and target is 32 bit"), ibfd);
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}
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else if ((ibfd->flags & DYNAMIC) == 0)
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{
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if (bfd_get_mach (obfd) < ibfd_mach)
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bfd_set_arch_mach (obfd, bfd_arch_sparc, ibfd_mach);
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}
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if (((elf_elfheader (ibfd)->e_flags & EF_SPARC_LEDATA)
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!= previous_ibfd_e_flags)
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&& previous_ibfd_e_flags != (unsigned long) -1)
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{
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_bfd_error_handler
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(_("%B: linking little endian files with big endian files"), ibfd);
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error = TRUE;
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}
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previous_ibfd_e_flags = elf_elfheader (ibfd)->e_flags & EF_SPARC_LEDATA;
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if (error)
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{
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bfd_set_error (bfd_error_bad_value);
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return FALSE;
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}
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return _bfd_sparc_elf_merge_private_bfd_data (ibfd, info);
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}
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/* The final processing done just before writing out the object file.
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We need to set the e_machine field appropriately. */
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static void
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elf32_sparc_final_write_processing (bfd *abfd,
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bfd_boolean linker ATTRIBUTE_UNUSED)
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{
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switch (bfd_get_mach (abfd))
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{
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case bfd_mach_sparc :
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case bfd_mach_sparc_sparclet :
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case bfd_mach_sparc_sparclite :
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break; /* nothing to do */
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case bfd_mach_sparc_v8plus :
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elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
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elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
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elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS;
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break;
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case bfd_mach_sparc_v8plusa :
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elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
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elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
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elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1;
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break;
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case bfd_mach_sparc_v8plusb :
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case bfd_mach_sparc_v8plusc :
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case bfd_mach_sparc_v8plusd :
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case bfd_mach_sparc_v8pluse :
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case bfd_mach_sparc_v8plusv :
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case bfd_mach_sparc_v8plusm :
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elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
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elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
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elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1
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| EF_SPARC_SUN_US3;
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break;
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case bfd_mach_sparc_sparclite_le :
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elf_elfheader (abfd)->e_flags |= EF_SPARC_LEDATA;
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break;
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default :
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abort ();
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break;
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}
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}
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static enum elf_reloc_type_class
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elf32_sparc_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
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const asection *rel_sec ATTRIBUTE_UNUSED,
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const Elf_Internal_Rela *rela)
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{
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switch ((int) ELF32_R_TYPE (rela->r_info))
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{
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case R_SPARC_RELATIVE:
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return reloc_class_relative;
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case R_SPARC_JMP_SLOT:
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return reloc_class_plt;
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case R_SPARC_COPY:
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return reloc_class_copy;
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default:
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return reloc_class_normal;
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}
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}
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/* Hook called by the linker routine which adds symbols from an object
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file. */
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static bfd_boolean
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elf32_sparc_add_symbol_hook (bfd * abfd,
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struct bfd_link_info * info,
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Elf_Internal_Sym * sym,
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const char ** namep ATTRIBUTE_UNUSED,
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flagword * flagsp ATTRIBUTE_UNUSED,
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asection ** secp ATTRIBUTE_UNUSED,
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bfd_vma * valp ATTRIBUTE_UNUSED)
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{
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if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
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&& (abfd->flags & DYNAMIC) == 0
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&& bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
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elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
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return TRUE;
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}
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#define TARGET_BIG_SYM sparc_elf32_vec
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#define TARGET_BIG_NAME "elf32-sparc"
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#define ELF_ARCH bfd_arch_sparc
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#define ELF_TARGET_ID SPARC_ELF_DATA
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#define ELF_MACHINE_CODE EM_SPARC
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#define ELF_MACHINE_ALT1 EM_SPARC32PLUS
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#define ELF_MAXPAGESIZE 0x10000
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#define ELF_COMMONPAGESIZE 0x2000
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#define bfd_elf32_bfd_merge_private_bfd_data \
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elf32_sparc_merge_private_bfd_data
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#define elf_backend_final_write_processing \
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elf32_sparc_final_write_processing
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#define elf_backend_grok_psinfo elf32_sparc_grok_psinfo
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#define elf_backend_reloc_type_class elf32_sparc_reloc_type_class
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#define elf_info_to_howto _bfd_sparc_elf_info_to_howto
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#define bfd_elf32_bfd_reloc_type_lookup _bfd_sparc_elf_reloc_type_lookup
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#define bfd_elf32_bfd_reloc_name_lookup \
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_bfd_sparc_elf_reloc_name_lookup
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#define bfd_elf32_bfd_link_hash_table_create \
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_bfd_sparc_elf_link_hash_table_create
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#define bfd_elf32_bfd_relax_section _bfd_sparc_elf_relax_section
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#define bfd_elf32_new_section_hook _bfd_sparc_elf_new_section_hook
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#define elf_backend_copy_indirect_symbol \
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_bfd_sparc_elf_copy_indirect_symbol
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#define elf_backend_create_dynamic_sections \
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_bfd_sparc_elf_create_dynamic_sections
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#define elf_backend_check_relocs _bfd_sparc_elf_check_relocs
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#define elf_backend_adjust_dynamic_symbol \
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_bfd_sparc_elf_adjust_dynamic_symbol
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#define elf_backend_omit_section_dynsym _bfd_sparc_elf_omit_section_dynsym
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#define elf_backend_size_dynamic_sections \
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_bfd_sparc_elf_size_dynamic_sections
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#define elf_backend_relocate_section _bfd_sparc_elf_relocate_section
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#define elf_backend_finish_dynamic_symbol \
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_bfd_sparc_elf_finish_dynamic_symbol
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#define elf_backend_finish_dynamic_sections \
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_bfd_sparc_elf_finish_dynamic_sections
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#define bfd_elf32_mkobject _bfd_sparc_elf_mkobject
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#define elf_backend_object_p _bfd_sparc_elf_object_p
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#define elf_backend_gc_mark_hook _bfd_sparc_elf_gc_mark_hook
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#define elf_backend_gc_sweep_hook _bfd_sparc_elf_gc_sweep_hook
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#define elf_backend_plt_sym_val _bfd_sparc_elf_plt_sym_val
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#define elf_backend_init_index_section _bfd_elf_init_1_index_section
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#define elf_backend_can_gc_sections 1
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#define elf_backend_can_refcount 1
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#define elf_backend_want_got_plt 0
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#define elf_backend_plt_readonly 0
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#define elf_backend_want_plt_sym 1
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#define elf_backend_got_header_size 4
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#define elf_backend_want_dynrelro 1
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#define elf_backend_rela_normal 1
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#define elf_backend_add_symbol_hook elf32_sparc_add_symbol_hook
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#include "elf32-target.h"
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/* Solaris 2. */
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#undef TARGET_BIG_SYM
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#define TARGET_BIG_SYM sparc_elf32_sol2_vec
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#undef TARGET_BIG_NAME
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#define TARGET_BIG_NAME "elf32-sparc-sol2"
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#undef elf32_bed
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#define elf32_bed elf32_sparc_sol2_bed
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/* The 32-bit static TLS arena size is rounded to the nearest 8-byte
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boundary. */
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#undef elf_backend_static_tls_alignment
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#define elf_backend_static_tls_alignment 8
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#undef elf_backend_strtab_flags
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#define elf_backend_strtab_flags SHF_STRINGS
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static bfd_boolean
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elf32_sparc_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
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bfd *obfd ATTRIBUTE_UNUSED,
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const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
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Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
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{
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/* PR 19938: FIXME: Need to add code for setting the sh_info
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and sh_link fields of Solaris specific section types. */
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return FALSE;
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}
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#undef elf_backend_copy_special_section_fields
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#define elf_backend_copy_special_section_fields elf32_sparc_copy_solaris_special_section_fields
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#include "elf32-target.h"
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/* A wrapper around _bfd_sparc_elf_link_hash_table_create that identifies
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the target system as VxWorks. */
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static struct bfd_link_hash_table *
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elf32_sparc_vxworks_link_hash_table_create (bfd *abfd)
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{
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struct bfd_link_hash_table *ret;
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ret = _bfd_sparc_elf_link_hash_table_create (abfd);
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if (ret)
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{
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struct _bfd_sparc_elf_link_hash_table *htab;
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htab = (struct _bfd_sparc_elf_link_hash_table *) ret;
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htab->is_vxworks = 1;
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}
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return ret;
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}
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/* A final_write_processing hook that does both the SPARC- and VxWorks-
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specific handling. */
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static void
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elf32_sparc_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker)
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{
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elf32_sparc_final_write_processing (abfd, linker);
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elf_vxworks_final_write_processing (abfd, linker);
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}
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#undef TARGET_BIG_SYM
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#define TARGET_BIG_SYM sparc_elf32_vxworks_vec
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#undef TARGET_BIG_NAME
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#define TARGET_BIG_NAME "elf32-sparc-vxworks"
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#undef ELF_MINPAGESIZE
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#define ELF_MINPAGESIZE 0x1000
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#undef bfd_elf32_bfd_link_hash_table_create
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#define bfd_elf32_bfd_link_hash_table_create \
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elf32_sparc_vxworks_link_hash_table_create
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#undef elf_backend_want_got_plt
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#define elf_backend_want_got_plt 1
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#undef elf_backend_plt_readonly
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#define elf_backend_plt_readonly 1
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#undef elf_backend_got_header_size
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#define elf_backend_got_header_size 12
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#undef elf_backend_dtrel_excludes_plt
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#define elf_backend_dtrel_excludes_plt 1
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#undef elf_backend_add_symbol_hook
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#define elf_backend_add_symbol_hook \
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elf_vxworks_add_symbol_hook
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#undef elf_backend_link_output_symbol_hook
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#define elf_backend_link_output_symbol_hook \
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elf_vxworks_link_output_symbol_hook
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#undef elf_backend_emit_relocs
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#define elf_backend_emit_relocs \
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elf_vxworks_emit_relocs
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#undef elf_backend_final_write_processing
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#define elf_backend_final_write_processing \
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elf32_sparc_vxworks_final_write_processing
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#undef elf_backend_static_tls_alignment
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#undef elf_backend_strtab_flags
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#undef elf_backend_copy_special_section_fields
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#undef elf32_bed
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#define elf32_bed sparc_elf_vxworks_bed
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#include "elf32-target.h"
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