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IFUNC: Update IFUNC resolver check with DT_TEXTREL
Add ifunc_resolvers to elf_link_hash_table and use it for both x86 and ppc64. Before glibc commit b5c45e837, DT_TEXTREL is incompatible with IFUNC resolvers. Set ifunc_resolvers if there are IFUNC resolvers and issue a warning for IFUNC resolvers with DT_TEXTREL. bfd/ PR ld/18801 * elf-bfd.h (elf_link_hash_table): Add ifunc_resolvers. (_bfd_elf_allocate_ifunc_dyn_relocs): Remove the bfd_boolean * argument. Set ifunc_resolvers if there are IFUNC resolvers. * elf-ifunc.c (_bfd_elf_allocate_ifunc_dyn_relocs): Updated. Set ifunc_resolvers if there are FUNC resolvers. * elf64-ppc.c (ppc_link_hash_table): Remove local_ifunc_resolver. (build_global_entry_stubs_and_plt): Replace local_ifunc_resolver with elf.ifunc_resolvers. (write_plt_relocs_for_local_syms): Likewise. (ppc64_elf_relocate_section): Likewise. (ppc64_elf_finish_dynamic_sections): Likewise. * elfnn-aarch64.c (elfNN_aarch64_allocate_ifunc_dynrelocs): Updated. * elfxx-x86.c (elf_x86_allocate_dynrelocs): Likewise. (_bfd_x86_elf_size_dynamic_sections): Check elf.ifunc_resolvers instead of readonly_dynrelocs_against_ifunc. * elfxx-x86.h (elf_x86_link_hash_table): Remove readonly_dynrelocs_against_ifunc. ld/ PR ld/18801 * testsuite/ld-i386/i386.exp: Run ifunc-textrel-1a, ifunc-textrel-1b, ifunc-textrel-2a and ifunc-textrel-2b. * testsuite/ld-x86-64/x86-64.exp: Likewise. * testsuite/ld-i386/ifunc-textrel-1a.d: Likewise. * testsuite/ld-i386/ifunc-textrel-1b.d: Likewise. * testsuite/ld-i386/ifunc-textrel-2a.d: Likewise. * testsuite/ld-i386/ifunc-textrel-2b.d: Likewise. * testsuite/ld-x86-64/ifunc-textrel-1.s: Likewise. * testsuite/ld-x86-64/ifunc-textrel-1a.d: Likewise. * testsuite/ld-x86-64/ifunc-textrel-1b.d: Likewise. * testsuite/ld-x86-64/ifunc-textrel-2.s: Likewise. * testsuite/ld-x86-64/ifunc-textrel-2a.d: Likewise. * testsuite/ld-x86-64/ifunc-textrel-2b.d: Likewise. * testsuite/ld-i386/pr18801a.d: Expect warning for IFUNC resolvers. * testsuite/ld-i386/pr18801b.d: Likewise. * estsuite/ld-x86-64/pr18801a.d: Likewise. * estsuite/ld-x86-64/pr18801b.d: Likewise.
This commit is contained in:
H.J. Lu
parent
f9630fa654
commit
cebd6b8ac1
@ -1,3 +1,26 @@
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2020-06-09 H.J. Lu <hongjiu.lu@intel.com>
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PR ld/18801
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* elf-bfd.h (elf_link_hash_table): Add ifunc_resolvers.
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(_bfd_elf_allocate_ifunc_dyn_relocs): Remove the
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bfd_boolean * argument. Set ifunc_resolvers if there are IFUNC
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resolvers.
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* elf-ifunc.c (_bfd_elf_allocate_ifunc_dyn_relocs): Updated.
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Set ifunc_resolvers if there are FUNC resolvers.
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* elf64-ppc.c (ppc_link_hash_table): Remove local_ifunc_resolver.
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(build_global_entry_stubs_and_plt): Replace local_ifunc_resolver
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with elf.ifunc_resolvers.
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(write_plt_relocs_for_local_syms): Likewise.
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(ppc64_elf_relocate_section): Likewise.
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(ppc64_elf_finish_dynamic_sections): Likewise.
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* elfnn-aarch64.c (elfNN_aarch64_allocate_ifunc_dynrelocs):
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Updated.
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* elfxx-x86.c (elf_x86_allocate_dynrelocs): Likewise.
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(_bfd_x86_elf_size_dynamic_sections): Check elf.ifunc_resolvers
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instead of readonly_dynrelocs_against_ifunc.
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* elfxx-x86.h (elf_x86_link_hash_table): Remove
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readonly_dynrelocs_against_ifunc.
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2020-06-09 Alan Modra <amodra@gmail.com>
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* elf64-ppc.c (struct ppc_link_hash_table): Delete
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@ -570,6 +570,9 @@ struct elf_link_hash_table
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section symbols. */
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bfd_boolean is_relocatable_executable;
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/* TRUE if there are IFUNC resolvers. */
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bfd_boolean ifunc_resolvers;
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/* The BFD used to hold special sections created by the linker.
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This will be the first BFD found which requires these sections to
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be created. */
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@ -2875,8 +2878,8 @@ extern bfd_boolean _bfd_elf_create_ifunc_sections
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(bfd *, struct bfd_link_info *);
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extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
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(struct bfd_link_info *, struct elf_link_hash_entry *,
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struct elf_dyn_relocs **, bfd_boolean *, unsigned int,
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unsigned int, unsigned int, bfd_boolean);
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struct elf_dyn_relocs **, unsigned int, unsigned int,
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unsigned int, bfd_boolean);
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extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
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extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);
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@ -107,7 +107,6 @@ bfd_boolean
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_bfd_elf_allocate_ifunc_dyn_relocs (struct bfd_link_info *info,
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struct elf_link_hash_entry *h,
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struct elf_dyn_relocs **head,
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bfd_boolean *readonly_dynrelocs_against_ifunc_p,
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unsigned int plt_entry_size,
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unsigned int plt_header_size,
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unsigned int got_entry_size,
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@ -118,7 +117,6 @@ _bfd_elf_allocate_ifunc_dyn_relocs (struct bfd_link_info *info,
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unsigned int sizeof_reloc;
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const struct elf_backend_data *bed;
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struct elf_link_hash_table *htab;
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bfd_boolean readonly_dynrelocs_against_ifunc;
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/* If AVOID_PLT is TRUE, don't use PLT if possible. */
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bfd_boolean use_plt = !avoid_plt || h->plt.refcount > 0;
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bfd_boolean need_dynreloc = !use_plt || bfd_link_pic (info);
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@ -255,8 +253,6 @@ _bfd_elf_allocate_ifunc_dyn_relocs (struct bfd_link_info *info,
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if (!need_dynreloc || !h->non_got_ref)
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*head = NULL;
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readonly_dynrelocs_against_ifunc = FALSE;
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/* Finally, allocate space. */
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p = *head;
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if (p != NULL)
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@ -264,17 +260,13 @@ _bfd_elf_allocate_ifunc_dyn_relocs (struct bfd_link_info *info,
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bfd_size_type count = 0;
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do
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{
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if (!readonly_dynrelocs_against_ifunc)
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{
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asection *s = p->sec->output_section;
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if (s != NULL && (s->flags & SEC_READONLY) != 0)
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readonly_dynrelocs_against_ifunc = TRUE;
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}
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count += p->count;
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p = p->next;
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}
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while (p != NULL);
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htab->ifunc_resolvers = count != 0;
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/* Dynamic relocations are stored in
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1. .rel[a].ifunc section in PIC object.
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2. .rel[a].got section in dynamic executable.
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@ -290,9 +282,6 @@ _bfd_elf_allocate_ifunc_dyn_relocs (struct bfd_link_info *info,
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}
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}
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if (readonly_dynrelocs_against_ifunc_p)
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*readonly_dynrelocs_against_ifunc_p = readonly_dynrelocs_against_ifunc;
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/* For STT_GNU_IFUNC symbol, .got.plt has the real function address
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and .got has the PLT entry adddress. We will load the GOT entry
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with the PLT entry in finish_dynamic_symbol if it is used. For
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@ -3239,10 +3239,6 @@ struct ppc_link_hash_table
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/* Whether func_desc_adjust needs to be run over symbols. */
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unsigned int need_func_desc_adj:1;
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/* Whether there exist local gnu indirect function resolvers,
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referenced by dynamic relocations. */
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unsigned int local_ifunc_resolver:1;
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/* Whether plt calls for ELFv2 localentry:0 funcs have been optimized. */
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unsigned int has_plt_localentry0:1;
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@ -13880,7 +13876,7 @@ build_global_entry_stubs_and_plt (struct elf_link_hash_entry *h, void *inf)
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{
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plt = htab->elf.iplt;
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relplt = htab->elf.irelplt;
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htab->local_ifunc_resolver = 1;
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htab->elf.ifunc_resolvers = TRUE;
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if (htab->opd_abi)
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rela.r_info = ELF64_R_INFO (0, R_PPC64_JMP_IREL);
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else
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@ -13934,7 +13930,7 @@ build_global_entry_stubs_and_plt (struct elf_link_hash_entry *h, void *inf)
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+ ((ent->plt.offset - PLT_INITIAL_ENTRY_SIZE (htab))
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/ PLT_ENTRY_SIZE (htab) * sizeof (Elf64_External_Rela)));
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if (h->type == STT_GNU_IFUNC && is_static_defined (h))
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htab->local_ifunc_resolver = 1;
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htab->elf.ifunc_resolvers = TRUE;
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bfd_elf64_swap_reloca_out (info->output_bfd, &rela, loc);
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}
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}
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@ -14076,7 +14072,7 @@ write_plt_relocs_for_local_syms (struct bfd_link_info *info)
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if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
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{
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htab->local_ifunc_resolver = 1;
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htab->elf.ifunc_resolvers = TRUE;
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plt = htab->elf.iplt;
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relplt = htab->elf.irelplt;
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}
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@ -16103,7 +16099,7 @@ ppc64_elf_relocate_section (bfd *output_bfd,
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{
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relgot = htab->elf.irelplt;
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if (indx == 0 || is_static_defined (&h->elf))
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htab->local_ifunc_resolver = 1;
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htab->elf.ifunc_resolvers = TRUE;
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}
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else if (indx != 0
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|| (bfd_link_pic (info)
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@ -16633,7 +16629,7 @@ ppc64_elf_relocate_section (bfd *output_bfd,
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{
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sreloc = htab->elf.irelplt;
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if (indx == 0 || is_static_defined (&h->elf))
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htab->local_ifunc_resolver = 1;
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htab->elf.ifunc_resolvers = TRUE;
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}
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if (sreloc == NULL)
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abort ();
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@ -17397,7 +17393,7 @@ ppc64_elf_finish_dynamic_sections (bfd *output_bfd,
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break;
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case DT_TEXTREL:
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if (htab->local_ifunc_resolver)
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if (htab->elf.ifunc_resolvers)
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info->callbacks->einfo
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(_("%P: warning: text relocations and GNU indirect "
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"functions may result in a segfault at runtime\n"));
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@ -8818,7 +8818,6 @@ elfNN_aarch64_allocate_ifunc_dynrelocs (struct elf_link_hash_entry *h,
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&& h->def_regular)
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return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
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&h->dyn_relocs,
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NULL,
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htab->plt_entry_size,
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htab->plt_header_size,
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GOT_ENTRY_SIZE,
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@ -132,7 +132,6 @@ elf_x86_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
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&& h->def_regular)
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{
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if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h, &h->dyn_relocs,
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&htab->readonly_dynrelocs_against_ifunc,
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plt_entry_size,
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(htab->plt.has_plt0
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* plt_entry_size),
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@ -1416,15 +1415,11 @@ _bfd_x86_elf_size_dynamic_sections (bfd *output_bfd,
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if ((info->flags & DF_TEXTREL) != 0)
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{
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if (htab->readonly_dynrelocs_against_ifunc)
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{
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info->callbacks->einfo
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(_("%P%X: read-only segment has dynamic IFUNC relocations;"
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" recompile with %s\n"),
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bfd_link_dll (info) ? "-fPIC" : "-fPIE");
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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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if (htab->elf.ifunc_resolvers)
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info->callbacks->einfo
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(_("%P: warning: GNU indirect functions with DT_TEXTREL "
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"may result in a segfault at runtime; recompile with %s\n"),
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bfd_link_dll (info) ? "-fPIC" : "-fPIE");
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if (!add_dynamic_entry (DT_TEXTREL, 0))
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return FALSE;
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@ -483,10 +483,6 @@ struct elf_x86_link_hash_table
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/* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
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bfd_vma next_irelative_index;
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/* TRUE if there are dynamic relocs against IFUNC symbols that apply
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to read-only sections. */
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bfd_boolean readonly_dynrelocs_against_ifunc;
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/* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
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This is used for i386 only. */
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asection *srelplt2;
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22
ld/ChangeLog
22
ld/ChangeLog
@ -1,3 +1,25 @@
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2020-06-09 H.J. Lu <hongjiu.lu@intel.com>
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PR ld/18801
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* testsuite/ld-i386/i386.exp: Run ifunc-textrel-1a,
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ifunc-textrel-1b, ifunc-textrel-2a and ifunc-textrel-2b.
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* testsuite/ld-x86-64/x86-64.exp: Likewise.
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* testsuite/ld-i386/ifunc-textrel-1a.d: Likewise.
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* testsuite/ld-i386/ifunc-textrel-1b.d: Likewise.
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* testsuite/ld-i386/ifunc-textrel-2a.d: Likewise.
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* testsuite/ld-i386/ifunc-textrel-2b.d: Likewise.
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* testsuite/ld-x86-64/ifunc-textrel-1.s: Likewise.
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* testsuite/ld-x86-64/ifunc-textrel-1a.d: Likewise.
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* testsuite/ld-x86-64/ifunc-textrel-1b.d: Likewise.
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* testsuite/ld-x86-64/ifunc-textrel-2.s: Likewise.
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* testsuite/ld-x86-64/ifunc-textrel-2a.d: Likewise.
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* testsuite/ld-x86-64/ifunc-textrel-2b.d: Likewise.
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* testsuite/ld-i386/pr18801a.d: Expect warning for IFUNC
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resolvers.
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* testsuite/ld-i386/pr18801b.d: Likewise.
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* estsuite/ld-x86-64/pr18801a.d: Likewise.
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* estsuite/ld-x86-64/pr18801b.d: Likewise.
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2020-06-09 Alan Modra <amodra@gmail.com>
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PR 26065
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@ -519,6 +519,10 @@ run_dump_test "pr17935-1"
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run_dump_test "pr17935-2"
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run_dump_test "pr18801a"
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run_dump_test "pr18801b"
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run_dump_test "ifunc-textrel-1a"
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run_dump_test "ifunc-textrel-1b"
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run_dump_test "ifunc-textrel-2a"
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run_dump_test "ifunc-textrel-2b"
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run_dump_test "pr18815"
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run_dump_test "pr19939a"
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run_dump_test "pr19939b"
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4
ld/testsuite/ld-i386/ifunc-textrel-1a.d
Normal file
4
ld/testsuite/ld-i386/ifunc-textrel-1a.d
Normal file
@ -0,0 +1,4 @@
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#source: ../ld-x86-64/ifunc-textrel-1.s
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#as: --32
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#ld: -m elf_i386 -pie
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#warning: GNU indirect functions with DT_TEXTREL may result in a segfault at runtime; recompile with -fPIE
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4
ld/testsuite/ld-i386/ifunc-textrel-1b.d
Normal file
4
ld/testsuite/ld-i386/ifunc-textrel-1b.d
Normal file
@ -0,0 +1,4 @@
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#source: ../ld-x86-64/ifunc-textrel-1.s
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#as: --32
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#ld: -m elf_i386 -shared
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#warning: GNU indirect functions with DT_TEXTREL may result in a segfault at runtime; recompile with -fPIC
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8
ld/testsuite/ld-i386/ifunc-textrel-2a.d
Normal file
8
ld/testsuite/ld-i386/ifunc-textrel-2a.d
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@ -0,0 +1,8 @@
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#source: ../ld-x86-64/ifunc-textrel-2.s
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#as: --32
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#ld: -m elf_i386 -pie -z notext
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#readelf: -r --wide
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#failif
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[0-9a-f]+ +[0-9a-f]+ +R_386_IRELATIVE +
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#..
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8
ld/testsuite/ld-i386/ifunc-textrel-2b.d
Normal file
8
ld/testsuite/ld-i386/ifunc-textrel-2b.d
Normal file
@ -0,0 +1,8 @@
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#source: ../ld-x86-64/ifunc-textrel-2.s
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#as: --32
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#ld: -m elf_i386 -shared -z notext
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#readelf: -r --wide
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#failif
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[0-9a-f]+ +[0-9a-f]+ +R_386_IRELATIVE +
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#..
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@ -1,4 +1,4 @@
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#source: pr18801.s
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#as: --32
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#ld: -m elf_i386 -pie
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#error: read-only segment has dynamic IFUNC relocations; recompile with -fPIE
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#warning: GNU indirect functions with DT_TEXTREL may result in a segfault at runtime; recompile with -fPIE
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@ -1,4 +1,4 @@
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#source: pr18801.s
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#as: --32
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#ld: -m elf_i386 -shared
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#error: read-only segment has dynamic IFUNC relocations; recompile with -fPIC
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#warning: GNU indirect functions with DT_TEXTREL may result in a segfault at runtime; recompile with -fPIC
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28
ld/testsuite/ld-x86-64/ifunc-textrel-1.s
Normal file
28
ld/testsuite/ld-x86-64/ifunc-textrel-1.s
Normal file
@ -0,0 +1,28 @@
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.text
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.type selector, %function
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foo:
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movl $0, %eax
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ret
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selector:
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.ifdef __x86_64__
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leaq foo(%rip), %rax
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.else
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leal foo@GOTOFF(%eax), %eax
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.endif
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ret
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.type selector, %gnu_indirect_function
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.globl _start
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_start:
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.ifdef __x86_64__
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movabs ptr, %rax
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call *%rax
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.else
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mov ptr, %eax
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call *%eax
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.endif
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ret
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.data
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.type ptr, @object
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ptr:
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.dc.a selector
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.section .note.GNU-stack,"",@progbits
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4
ld/testsuite/ld-x86-64/ifunc-textrel-1a.d
Normal file
4
ld/testsuite/ld-x86-64/ifunc-textrel-1a.d
Normal file
@ -0,0 +1,4 @@
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#source: ifunc-textrel-1.s
|
||||
#as: --64 -defsym __x86_64__=1
|
||||
#ld: -m elf_x86_64 -pie
|
||||
#warning: GNU indirect functions with DT_TEXTREL may result in a segfault at runtime; recompile with -fPIE
|
||||
4
ld/testsuite/ld-x86-64/ifunc-textrel-1b.d
Normal file
4
ld/testsuite/ld-x86-64/ifunc-textrel-1b.d
Normal file
@ -0,0 +1,4 @@
|
||||
#source: ifunc-textrel-1.s
|
||||
#as: --64 -defsym __x86_64__=1
|
||||
#ld: -m elf_x86_64 -shared
|
||||
#warning: GNU indirect functions with DT_TEXTREL may result in a segfault at runtime; recompile with -fPIC
|
||||
28
ld/testsuite/ld-x86-64/ifunc-textrel-2.s
Normal file
28
ld/testsuite/ld-x86-64/ifunc-textrel-2.s
Normal file
@ -0,0 +1,28 @@
|
||||
.text
|
||||
.type selector, %function
|
||||
foo:
|
||||
movl $0, %eax
|
||||
ret
|
||||
selector:
|
||||
.ifdef __x86_64__
|
||||
leaq foo(%rip), %rax
|
||||
.else
|
||||
leal foo@GOTOFF(%eax), %eax
|
||||
.endif
|
||||
ret
|
||||
.type selector, %gnu_indirect_function
|
||||
.globl _start
|
||||
_start:
|
||||
.ifdef __x86_64__
|
||||
movabs ptr, %rax
|
||||
call *%rax
|
||||
.else
|
||||
mov ptr, %eax
|
||||
call *%eax
|
||||
.endif
|
||||
ret
|
||||
.data
|
||||
.type ptr, @object
|
||||
ptr:
|
||||
.dc.a foo
|
||||
.section .note.GNU-stack,"",@progbits
|
||||
8
ld/testsuite/ld-x86-64/ifunc-textrel-2a.d
Normal file
8
ld/testsuite/ld-x86-64/ifunc-textrel-2a.d
Normal file
@ -0,0 +1,8 @@
|
||||
#source: ifunc-textrel-2.s
|
||||
#as: --64 -defsym __x86_64__=1
|
||||
#ld: -m elf_x86_64 -pie -z notext
|
||||
#readelf: -r --wide
|
||||
|
||||
#failif
|
||||
[0-9a-f]+ +[0-9a-f]+ +R_X86_64_IRELATIVE +[0-9a-f]+
|
||||
#..
|
||||
8
ld/testsuite/ld-x86-64/ifunc-textrel-2b.d
Normal file
8
ld/testsuite/ld-x86-64/ifunc-textrel-2b.d
Normal file
@ -0,0 +1,8 @@
|
||||
#source: ifunc-textrel-2.s
|
||||
#as: --64 -defsym __x86_64__=1
|
||||
#ld: -m elf_x86_64 -shared -z notext
|
||||
#readelf: -r --wide
|
||||
|
||||
#failif
|
||||
[0-9a-f]+ +[0-9a-f]+ +R_X86_64_IRELATIVE +[0-9a-f]+
|
||||
#..
|
||||
@ -1,4 +1,4 @@
|
||||
#source: pr18801.s
|
||||
#as: --64
|
||||
#ld: -melf_x86_64 -pie
|
||||
#error: read-only segment has dynamic IFUNC relocations; recompile with -fPIE
|
||||
#warning: GNU indirect functions with DT_TEXTREL may result in a segfault at runtime; recompile with -fPIE
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
#source: pr18801.s
|
||||
#as: --64
|
||||
#ld: -melf_x86_64 -shared
|
||||
#error: read-only segment has dynamic IFUNC relocations; recompile with -fPIC
|
||||
#warning: GNU indirect functions with DT_TEXTREL may result in a segfault at runtime; recompile with -fPIC
|
||||
|
||||
@ -581,6 +581,10 @@ run_dump_test "pr18160"
|
||||
run_dump_test "pr18176"
|
||||
run_dump_test "pr18801a"
|
||||
run_dump_test "pr18801b"
|
||||
run_dump_test "ifunc-textrel-1a"
|
||||
run_dump_test "ifunc-textrel-1b"
|
||||
run_dump_test "ifunc-textrel-2a"
|
||||
run_dump_test "ifunc-textrel-2b"
|
||||
run_dump_test "pr18815"
|
||||
run_dump_test "pr19013"
|
||||
run_dump_test "pr19013-x32"
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user