Commit: PR 22875: Stop strip corrupting unknown relocs

Nick Clifton
Tue Feb 27 10:13:00 GMT 2018

Hi Guys,

  I am going to apply the attached patch to fix PR 22875, which is about
  strip corrupting binaries because it does not recognise some of the
  relocs that it contains.

  In order to do this I had to make two changes - first strip/objcopy
  needed to notice if relocation processing failed, and if it does, then
  stop the strip process and return an error result.

  Second I needed a way to get an error result back to strip/objcopy,
  without corrupting any relocations in the process.  The solution is to
  change the info_to_howto functions in the elf backend data structure
  from returning void to returning a boolean success/fail result.  This
  means that these functions no longer need to always create a valid
  howto pointer, and so they do not need to change an unknown reloc into
  a known, null, reloc.

  The patch is quite large, because it touches almost all of the ELF
  files in the BFD library, but it is actually quite simple in
  execution.  I have tested it with a large number of different targets,
  and added a small testcase to the binutils testsuite as well.


2018-02-26  Nick Clifton  <>

	PR 22875
	* elf-bfd.h (struct elf_backend_data): Change the return type of
	the elf_info_to_howto and elf_info_to_howto_rel function pointers
	to bfd_boolean.
	* elfcode.h (elf_slurp_reloc_table_from_section): Check the
	return value from the info_to_howto function and fail if that
	function failed.
	* elf32-h8300.c (elf32_h8_relocate_section): Check return value
	from the info_to_howto function.
	(elf32_h8_relax_section): Likewise.
	* elf32-lm32.c (lm32_elf_relocate_section): Likewise.
	* elf32-m68hc1x.c (elf32_m68hc11_relocate_section): Likewise.
	* elf32-score.c (s3_bfd_score_elf_relocate_section): Likewise.
	* elf32-score7.c (s7_bfd_score_elf_relocate_section): Likewise.
	* elf32-tic6x.c (elf32_tic6x_relocate_section): Likewise.
	* elf64-ia64-vms.c (elf64_ia64_relocate_section): Likewise.
	* elf64-sparc.c (elf64_sparc_slurp_one_reloc_table): Likewise.
	* elf64-x86-64.c (elf_x86_64_tls_transition): Likewise.
	* elfnn-ia64.c (elfNN_ia64_relocate_section): Likewise.
	* elfnn-riscv.c (riscv_elf_check_relocs): Likewise.
	(riscv_elf_relocate_section): Likewise.
	* elf-hppa.h (elf_hppa_info_to_howto): Change return type to
	bfd_boolean.  Issue an error message, set an error value and
	return FALSE if the reloc is not recognized.
	(elf_hppa_info_to_howto_rel): Likewise.
	* elf-m10200.c (mn10200_info_to_howto): Likewise.
	* elf-m10300.c (mn10300_info_to_howto): Likewise.
	* elf.c (_bfd_elf_no_info_to_howto): Likewise.
	* elf32-arc.c (arc_info_to_howto_rel): Likewise.
	* elf32-arm.c (elf32_arm_info_to_howto): Likewise.
	* elf32-avr.c (avr_info_to_howto_rela): Likewise.
	* elf32-bfin.c (bfin_info_to_howto): Likewise.
	* elf32-cr16.c (elf_cr16_info_to_howto): Likewise.
	* elf32-cr16c.c (elf_cr16c_info_to_howto): Likewise.
	* elf32-cris.c (elf_cr16c_info_to_howto_rel,
	cris_info_to_howto_rela): Likewise. 
	* elf32-crx.c (elf_crx_info_to_howto): Likewise.
	* elf32-d10v.c (d10v_info_to_howto_rel): Likewise.
	* elf32-d30v.c (d30v_info_to_howto_rel,
	d30v_info_to_howto_rela): Likewise.
	* elf32-dlx.c (dlx_rtype_to_howto, elf32_dlx_info_to_howto,
	elf32_dlx_info_to_howto_rel): Likewise. 
	* elf32-epiphany.c (epiphany_info_to_howto_rela): Likewise.
	* elf32-fr30.c (fr30_info_to_howto_rela): Likewise.
	* elf32-frv.c (frv_info_to_howto_rela,
	frvfdpic_info_to_howto_rel): Likewise.
	* elf32-ft32.c (ft32_info_to_howto_rela): Likewise.
	* elf32-gen.c (elf_generic_info_to_howto,
	elf_generic_info_to_howto_rel): Likewise.
	* elf32-h8300.c (elf32_h8_info_to_howto,
	elf32_h8_info_to_howto_rel): Likewise.
	* elf32-i370.c (i370_elf_info_to_howto): Likewise.
	* elf32-i386.c (elf_i386_reloc_type_lookup,
	elf_i386_rtype_to_howto, elf_i386_info_to_howto_rel): Likewise.
	* elf32-i860.c (lookup_howto, elf32_i860_info_to_howto_rela):
	* elf32-i960.c (elf32_i960_info_to_howto_rel): Likewise.
	* elf32-ip2k.c (ip2k_info_to_howto_rela): Likewise.
	* elf32-iq2000.c (iq2000_info_to_howto_rela): Likewise.
	* elf32-lm32.c (lm32_info_to_howto_rela): Likewise.
	* elf32-m32c.c (m32c_info_to_howto_rela): Likewise.
	* elf32-m32r.c (m32r_info_to_howto_rel, m32r_info_to_howto): Likewise.
	* elf32-m68hc11.c (m68hc11_info_to_howto_rel): Likewise.
	* elf32-m68hc12.c (m68hc11_info_to_howto_rel): Likewise.
	* elf32-m68k.c (rtype_to_howto): Likewise.
	* elf32-mcore.c (mcore_elf_info_to_howto): Likewise.
	* elf32-mep.c (mep_info_to_howto_rela): Likewise.
	* elf32-metag.c (metag_info_to_howto_rela): Likewise.
	* elf32-microblaze.c (microblaze_elf_info_to_howto): Likewise.
	* elf32-mips.c (mips_info_to_howto_rel,
	mips_info_to_howto_rela): Likewise.
	* elf32-moxie.c (moxie_info_to_howto_rela): Likewise.
	* elf32-msp430.c (msp430_info_to_howto_rela): Likewise.
	* elf32-mt.c (mt_info_to_howto_rela): Likewise.
	* elf32-nds32.c (nds32_info_to_howto_rel, nds32_info_to_howto):
	* elf32-nios2.c (nios2_elf32_info_to_howto): Likewise.
	* elf32-or1k.c (or1k_info_to_howto_rela): Likewise.
	* elf32-pj.c (pj_elf_info_to_howto): Likewise.
	* elf32-ppc.c (ppc_elf_info_to_howto): Likewise.
	* elf32-pru.c (pru_elf32_info_to_howto): Likewise.
	* elf32-rl78.c (rl78_info_to_howto_rela): Likewise.
	* elf32-rx.c (rx_info_to_howto_rela): Likewise.
	* elf32-s390.c (elf_s390_info_to_howto): Likewise.
	* elf32-score.c (s3_bfd_score_info_to_howto,
	_bfd_score_info_to_howto): Likewise.
	* elf32-score7.c (s7_bfd_score_info_to_howto): Likewise.
	* elf32-sh.c (sh_elf_info_to_howto): Likewise.
	* elf32-spu.c (spu_elf_info_to_howto): Likewise.
	* elf32-tic6x.c (elf32_tic6x_info_to_howto,
	elf32_tic6x_info_to_howto_rel): Likewise.
	* elf32-tilepro.c (tilepro_info_to_howto_rela): Likewise.
	* elf32-v850.c (v850_elf_info_to_howto_rel,
	v850_elf_info_to_howto_rela, v800_elf_info_to_howto): Likewise.
	* elf32-vax.c (rtype_to_howto): Likewise.
	* elf32-visium.c (visium_info_to_howto_rela): Likewise.
	* elf32-wasm32.c (elf32_wasm32_rtype_to_howto,
	elf32_wasm32_info_to_howto_rela): Likewise.
	* elf32-xc16x.c (elf32_xc16x_info_to_howto): Likewise.
	* elf32-xgate.c (xgate_info_to_howto_rel): Likewise.
	* elf32-xstormy16.c (xstormy16_info_to_howto_rela): Likewise.
	* elf32-xtensa.c (elf_xtensa_info_to_howto_rela): Likewise.
	* elf64-alpha.c (elf64_alpha_info_to_howto): Likewise.
	* elf64-gen.c (elf_generic_info_to_howto,
	elf_generic_info_to_howto_rel): Likewise.
	* elf64-ia64-vms.c (elf64_ia64_info_to_howto): Likewise.
	* elf64-mips.c (mips_elf64_info_to_howto_rela): Likewise.
	* elf64-mmix.c (mmix_info_to_howto_rela): Likewise.
	* elf64-ppc.c (ppc64_elf_info_to_howto): Likewise.
	* elf64-s390.c (elf_s390_reloc_type_lookup): Likewise.
	* elf64-sh64.c (elf_s390_info_to_howto, sh_elf64_info_to_howto):
	* elf64-x86-64.c (elf_x86_64_info_to_howto): Likewise.
	* elfn32-mips.c (mips_info_to_howto_rel,
	mips_info_to_howto_rela): Likewise.
	* elfnn-aarch64.c (elfNN_aarch64_info_to_howto): Likewise.
	* elfnn-ia64.c (elfNN_ia64_info_to_howto): Likewise.
	* elfnn-riscv.c (riscv_info_to_howto_rela): Likewise.
	* elfxx-ia64.c (ia64_elf_reloc_type_lookup): Likewise.
	* elfxx-sparc.c (_bfd_sparc_elf_info_to_howto): Likewise.
	* elfxx-tilegx.c (tilegx_info_to_howto_rela): Likewise.
	* elf32-score.h (s7_bfd_score_info_to_howto): Update prototype.
	* elfxx-sparc.h (_bfd_sparc_elf_info_to_howto): Update prototype.
	* elfxx-tilegx.h (tilegx_info_to_howto_rela): Update prototype.
	* elfxx-target.h (elf_info_to_howto, elf_info_to_howto_rel): Default to NULL.

2018-02-26  Nick Clifton  <>

	PR 22875
	* objcopy.c (copy_object): Check the error status after marking symbols used in relocations.
	* testsuite/binutils-all/strip-13.s: New test source file.
	* testsuite/binutils-all/strip-13.s: New test driver file.
	* testsuite/binutils-all/objcopy.exp: Run the new test.

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