From 8410d65b77164d020a45cc9aa17a0147dc76862d Mon Sep 17 00:00:00 2001 From: "Jose E. Marchesi" Date: Tue, 4 Sep 2018 19:02:38 +0200 Subject: [PATCH] bfd, sparc: issue an error when reading relocations with invalid symbol references. The function `elf64_sparc_slurp_one_reloc_table' in elf64-sparc.c currently checks that the symbol indexes read in the r_sym fields of relocations are in range. This is done for both dynamic and non-dynamic symbols. This avoids subsequent invalid memory accesses. However, no error is issued to the user. This patch makes BFD to issue an error when the read symbol index is out of range, following the same behavior implemented in both the generic ELF routines and other ELF backends (such as mips64). Tested in x86_64-linux-gnu, sparc64-linux-gnu, and --enable-targets=all. 2018-09-04 Jose E. Marchesi * elf64-sparc.c (elf64_sparc_slurp_one_reloc_table): Issue an error when an invalid symbol index is retrieved in ELF64_R_SYM of a relocation seen in an input file. --- bfd/ChangeLog | 6 ++++++ bfd/elf64-sparc.c | 18 +++++++++++++----- 2 files changed, 19 insertions(+), 5 deletions(-) diff --git a/bfd/ChangeLog b/bfd/ChangeLog index 9a3b9b1ec2..22837e0f0e 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,9 @@ +2018-09-04 Jose E. Marchesi + + * elf64-sparc.c (elf64_sparc_slurp_one_reloc_table): Issue an + error when an invalid symbol index is retrieved in ELF64_R_SYM of + a relocation seen in an input file. + 2018-09-03 Jozef Lawrynowicz Alan Modra diff --git a/bfd/elf64-sparc.c b/bfd/elf64-sparc.c index 8c45d3257e..41e1b7acf7 100644 --- a/bfd/elf64-sparc.c +++ b/bfd/elf64-sparc.c @@ -97,12 +97,20 @@ elf64_sparc_slurp_one_reloc_table (bfd *abfd, asection *asect, else relent->address = rela.r_offset - asect->vma; - if (ELF64_R_SYM (rela.r_info) == STN_UNDEF - /* PR 17512: file: 996185f8. */ - || (!dynamic && ELF64_R_SYM(rela.r_info) > bfd_get_symcount(abfd)) - || (dynamic - && ELF64_R_SYM(rela.r_info) > bfd_get_dynamic_symcount(abfd))) + if (ELF64_R_SYM (rela.r_info) == STN_UNDEF) relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; + else if (/* PR 17512: file: 996185f8. */ + (!dynamic && ELF64_R_SYM(rela.r_info) > bfd_get_symcount(abfd)) + || (dynamic + && ELF64_R_SYM(rela.r_info) > bfd_get_dynamic_symcount(abfd))) + { + _bfd_error_handler + /* xgettext:c-format */ + (_("%pB(%pA): relocation %d has invalid symbol index %ld"), + abfd, asect, i, (long) ELF64_R_SYM (rela.r_info)); + bfd_set_error (bfd_error_bad_value); + relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; + } else { asymbol **ps, *s; -- 2.34.1