From 661b504df9bfb8d7c5d669091720e1dc0079c05e Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Thu, 8 Jul 2021 13:49:17 -0700 Subject: x86-64: Disallow PC reloc against weak undefined symbols in PIE Disallow PC relocations against weak undefined symbols in PIE since they can lead to non-zero address at run-time. bfd/ PR ld/21782 * elf64-x86-64.c (elf_x86_64_relocate_section): Disallow PC relocations against weak undefined symbols in PIE. ld/ PR ld/21782 * testsuite/ld-x86-64/pie3.d: Expect linker error. --- bfd/elf64-x86-64.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'bfd/elf64-x86-64.c') diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c index 4c55c59..8deb62d 100644 --- a/bfd/elf64-x86-64.c +++ b/bfd/elf64-x86-64.c @@ -3161,6 +3161,8 @@ elf_x86_64_relocate_section (bfd *output_bfd, || (no_copyreloc_p && h->def_dynamic && !(h->root.u.def.section->flags & SEC_CODE)))) + || (bfd_link_pie (info) + && h->root.type == bfd_link_hash_undefweak) || bfd_link_dll (info))) { bool fail = false; @@ -3174,8 +3176,9 @@ elf_x86_64_relocate_section (bfd *output_bfd, { /* We can only use PC-relative relocations in PIE from non-code sections. */ - if (h->type == STT_FUNC - && (sec->flags & SEC_CODE) != 0) + if (h->root.type == bfd_link_hash_undefweak + || (h->type == STT_FUNC + && (sec->flags & SEC_CODE) != 0)) fail = true; } else if (no_copyreloc_p || bfd_link_dll (info)) -- cgit v1.1