2017-04-03 17:03:14 +02:00
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/* ELF program property support.
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Copyright (C) 2017 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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/* GNU program property draft is at:
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https://github.com/hjl-tools/linux-abi/wiki/property-draft.pdf
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*/
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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/* Get a property, allocate a new one if needed. */
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elf_property *
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_bfd_elf_get_property (bfd *abfd, unsigned int type, unsigned int datasz)
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{
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elf_property_list *p, **lastp;
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if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
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{
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/* Never should happen. */
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abort ();
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}
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/* Keep the property list in order of type. */
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lastp = &elf_properties (abfd);
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for (p = *lastp; p; p = p->next)
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{
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/* Reuse the existing entry. */
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if (type == p->property.pr_type)
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{
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if (datasz > p->property.pr_datasz)
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{
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/* This can happen when mixing 32-bit and 64-bit objects. */
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p->property.pr_datasz = datasz;
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}
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return &p->property;
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}
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else if (type < p->property.pr_type)
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break;
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lastp = &p->next;
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}
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p = (elf_property_list *) bfd_alloc (abfd, sizeof (*p));
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if (p == NULL)
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{
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_bfd_error_handler (_("%B: out of memory in _bfd_elf_get_property"),
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abfd);
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_exit (EXIT_FAILURE);
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}
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memset (p, 0, sizeof (*p));
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p->property.pr_type = type;
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p->property.pr_datasz = datasz;
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p->next = *lastp;
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*lastp = p;
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return &p->property;
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}
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/* Parse GNU properties. */
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bfd_boolean
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_bfd_elf_parse_gnu_properties (bfd *abfd, Elf_Internal_Note *note)
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{
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const struct elf_backend_data *bed = get_elf_backend_data (abfd);
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unsigned int align_size = bed->s->elfclass == ELFCLASS64 ? 8 : 4;
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bfd_byte *ptr = (bfd_byte *) note->descdata;
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bfd_byte *ptr_end = ptr + note->descsz;
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if (note->descsz < 8 || (note->descsz % align_size) != 0)
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{
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bad_size:
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_bfd_error_handler
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2017-04-12 00:41:00 +02:00
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(_("warning: %B: corrupt GNU_PROPERTY_TYPE (%ld) size: %#lx"),
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2017-04-03 17:03:14 +02:00
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abfd, note->type, note->descsz);
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return FALSE;
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}
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2017-10-17 13:27:29 +02:00
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while (ptr != ptr_end)
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2017-04-03 17:03:14 +02:00
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{
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2017-10-17 13:27:29 +02:00
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unsigned int type;
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unsigned int datasz;
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2017-04-03 17:03:14 +02:00
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elf_property *prop;
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2017-10-17 13:27:29 +02:00
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if ((size_t) (ptr_end - ptr) < 8)
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goto bad_size;
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type = bfd_h_get_32 (abfd, ptr);
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datasz = bfd_h_get_32 (abfd, ptr + 4);
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2017-04-03 17:03:14 +02:00
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ptr += 8;
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2017-10-17 13:27:29 +02:00
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if (datasz > (size_t) (ptr_end - ptr))
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2017-04-03 17:03:14 +02:00
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{
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_bfd_error_handler
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2017-04-12 00:41:00 +02:00
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(_("warning: %B: corrupt GNU_PROPERTY_TYPE (%ld) type (0x%x) datasz: 0x%x"),
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2017-04-03 17:03:14 +02:00
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abfd, note->type, type, datasz);
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/* Clear all properties. */
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elf_properties (abfd) = NULL;
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return FALSE;
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}
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if (type >= GNU_PROPERTY_LOPROC)
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{
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2017-04-12 00:07:41 +02:00
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if (bed->elf_machine_code == EM_NONE)
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{
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/* Ignore processor-specific properties with generic ELF
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target vector. They should be handled by the matching
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ELF target vector. */
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goto next;
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}
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else if (type < GNU_PROPERTY_LOUSER
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&& bed->parse_gnu_properties)
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2017-04-03 17:03:14 +02:00
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{
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enum elf_property_kind kind
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= bed->parse_gnu_properties (abfd, type, ptr, datasz);
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if (kind == property_corrupt)
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{
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/* Clear all properties. */
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elf_properties (abfd) = NULL;
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return FALSE;
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}
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else if (kind != property_ignored)
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goto next;
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}
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}
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else
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{
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switch (type)
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{
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case GNU_PROPERTY_STACK_SIZE:
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if (datasz != align_size)
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{
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_bfd_error_handler
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2017-04-12 00:41:00 +02:00
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(_("warning: %B: corrupt stack size: 0x%x"),
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2017-04-03 17:03:14 +02:00
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abfd, datasz);
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/* Clear all properties. */
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elf_properties (abfd) = NULL;
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return FALSE;
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}
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prop = _bfd_elf_get_property (abfd, type, datasz);
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if (datasz == 8)
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prop->u.number = bfd_h_get_64 (abfd, ptr);
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else
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prop->u.number = bfd_h_get_32 (abfd, ptr);
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prop->pr_kind = property_number;
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goto next;
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case GNU_PROPERTY_NO_COPY_ON_PROTECTED:
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if (datasz != 0)
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{
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_bfd_error_handler
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2017-04-12 00:41:00 +02:00
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(_("warning: %B: corrupt no copy on protected size: 0x%x"),
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2017-04-03 17:03:14 +02:00
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abfd, datasz);
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/* Clear all properties. */
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elf_properties (abfd) = NULL;
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return FALSE;
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}
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prop = _bfd_elf_get_property (abfd, type, datasz);
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2017-08-27 04:22:26 +02:00
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elf_has_no_copy_on_protected (abfd) = TRUE;
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2017-04-03 17:03:14 +02:00
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prop->pr_kind = property_number;
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goto next;
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default:
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break;
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}
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}
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_bfd_error_handler
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2017-04-12 00:41:00 +02:00
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(_("warning: %B: unsupported GNU_PROPERTY_TYPE (%ld) type: 0x%x"),
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2017-04-03 17:03:14 +02:00
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abfd, note->type, type);
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next:
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ptr += (datasz + (align_size - 1)) & ~ (align_size - 1);
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}
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return TRUE;
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}
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/* Merge GNU property BPROP with APROP. If APROP isn't NULL, return TRUE
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if APROP is updated. Otherwise, return TRUE if BPROP should be merged
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with ABFD. */
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static bfd_boolean
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2017-06-12 16:37:15 +02:00
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elf_merge_gnu_properties (struct bfd_link_info *info, bfd *abfd,
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elf_property *aprop, elf_property *bprop)
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2017-04-03 17:03:14 +02:00
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{
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const struct elf_backend_data *bed = get_elf_backend_data (abfd);
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unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type;
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if (bed->merge_gnu_properties != NULL
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&& pr_type >= GNU_PROPERTY_LOPROC
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&& pr_type < GNU_PROPERTY_LOUSER)
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2017-06-12 16:37:15 +02:00
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return bed->merge_gnu_properties (info, abfd, aprop, bprop);
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2017-04-03 17:03:14 +02:00
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switch (pr_type)
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{
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case GNU_PROPERTY_STACK_SIZE:
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if (aprop != NULL && bprop != NULL)
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{
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if (bprop->u.number > aprop->u.number)
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{
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aprop->u.number = bprop->u.number;
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return TRUE;
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}
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break;
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}
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/* FALLTHROUGH */
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case GNU_PROPERTY_NO_COPY_ON_PROTECTED:
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/* Return TRUE if APROP is NULL to indicate that BPROP should
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be added to ABFD. */
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return aprop == NULL;
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default:
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/* Never should happen. */
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abort ();
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}
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return FALSE;
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}
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/* Return the property of TYPE on *LISTP and remove it from *LISTP.
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Return NULL if not found. */
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static elf_property *
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elf_find_and_remove_property (elf_property_list **listp,
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unsigned int type)
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{
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elf_property_list *list;
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for (list = *listp; list; list = list->next)
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{
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if (type == list->property.pr_type)
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{
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/* Remove this property. */
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*listp = list->next;
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return &list->property;
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}
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else if (type < list->property.pr_type)
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break;
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listp = &list->next;
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}
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return NULL;
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}
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/* Merge GNU property list *LISTP with ABFD. */
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static void
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2017-06-12 16:37:15 +02:00
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elf_merge_gnu_property_list (struct bfd_link_info *info, bfd *abfd,
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elf_property_list **listp)
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2017-04-03 17:03:14 +02:00
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{
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elf_property_list *p, **lastp;
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elf_property *pr;
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/* Merge each GNU property in ABFD with the one on *LISTP. */
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lastp = &elf_properties (abfd);
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for (p = *lastp; p; p = p->next)
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{
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pr = elf_find_and_remove_property (listp, p->property.pr_type);
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/* Pass NULL to elf_merge_gnu_properties for the property which
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isn't on *LISTP. */
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2017-06-12 16:37:15 +02:00
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elf_merge_gnu_properties (info, abfd, &p->property, pr);
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2017-04-03 17:03:14 +02:00
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if (p->property.pr_kind == property_remove)
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{
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/* Remove this property. */
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*lastp = p->next;
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continue;
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}
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lastp = &p->next;
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}
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/* Merge the remaining properties on *LISTP with ABFD. */
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for (p = *listp; p != NULL; p = p->next)
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2017-06-12 16:37:15 +02:00
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if (elf_merge_gnu_properties (info, abfd, NULL, &p->property))
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2017-04-03 17:03:14 +02:00
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{
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2017-08-27 04:22:26 +02:00
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if (p->property.pr_type == GNU_PROPERTY_NO_COPY_ON_PROTECTED)
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elf_has_no_copy_on_protected (abfd) = TRUE;
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2017-04-03 17:03:14 +02:00
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pr = _bfd_elf_get_property (abfd, p->property.pr_type,
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p->property.pr_datasz);
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/* It must be a new property. */
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if (pr->pr_kind != property_unknown)
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abort ();
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/* Add a new property. */
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*pr = p->property;
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}
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}
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2017-04-27 18:07:23 +02:00
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/* Set up GNU properties. Return the first relocatable ELF input with
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GNU properties if found. Otherwise, return NULL. */
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2017-04-03 17:03:14 +02:00
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2017-04-27 18:07:23 +02:00
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bfd *
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2017-04-03 17:03:14 +02:00
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_bfd_elf_link_setup_gnu_properties (struct bfd_link_info *info)
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{
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bfd *abfd, *first_pbfd = NULL;
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elf_property_list *list;
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asection *sec;
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bfd_boolean has_properties = FALSE;
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const struct elf_backend_data *bed
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= get_elf_backend_data (info->output_bfd);
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unsigned int elfclass = bed->s->elfclass;
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int elf_machine_code = bed->elf_machine_code;
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/* Find the first relocatable ELF input with GNU properties. */
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for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
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if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
|
2017-06-20 05:30:20 +02:00
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&& (abfd->flags & DYNAMIC) == 0
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2017-04-03 17:03:14 +02:00
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&& elf_properties (abfd) != NULL)
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{
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has_properties = TRUE;
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/* Ignore GNU properties from ELF objects with different machine
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2017-11-20 16:32:55 +01:00
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code or class. Also skip objects without a GNU_PROPERTY note
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section. */
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2017-04-03 17:03:14 +02:00
|
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if ((elf_machine_code
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== get_elf_backend_data (abfd)->elf_machine_code)
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&& (elfclass
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2017-11-20 16:32:55 +01:00
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== get_elf_backend_data (abfd)->s->elfclass)
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&& bfd_get_section_by_name (abfd,
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NOTE_GNU_PROPERTY_SECTION_NAME) != NULL
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)
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2017-04-03 17:03:14 +02:00
|
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{
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/* Keep .note.gnu.property section in FIRST_PBFD. */
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first_pbfd = abfd;
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break;
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}
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}
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|
|
/* Do nothing if there is no .note.gnu.property section. */
|
|
|
|
if (!has_properties)
|
2017-04-27 18:07:23 +02:00
|
|
|
return NULL;
|
2017-04-03 17:03:14 +02:00
|
|
|
|
|
|
|
/* Merge .note.gnu.property sections. */
|
|
|
|
for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
|
2017-06-20 05:30:20 +02:00
|
|
|
if (abfd != first_pbfd && (abfd->flags & DYNAMIC) == 0)
|
2017-04-03 17:03:14 +02:00
|
|
|
{
|
|
|
|
elf_property_list *null_ptr = NULL;
|
|
|
|
elf_property_list **listp = &null_ptr;
|
|
|
|
|
|
|
|
/* Merge .note.gnu.property section in relocatable ELF input. */
|
|
|
|
if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
|
|
|
|
{
|
|
|
|
list = elf_properties (abfd);
|
|
|
|
|
|
|
|
/* Ignore GNU properties from ELF objects with different
|
|
|
|
machine code. */
|
|
|
|
if (list != NULL
|
|
|
|
&& (elf_machine_code
|
|
|
|
== get_elf_backend_data (abfd)->elf_machine_code))
|
|
|
|
listp = &elf_properties (abfd);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
list = NULL;
|
|
|
|
|
|
|
|
/* Merge properties with FIRST_PBFD. FIRST_PBFD can be NULL
|
|
|
|
when all properties are from ELF objects with different
|
|
|
|
machine code or class. */
|
|
|
|
if (first_pbfd != NULL)
|
2017-06-12 16:37:15 +02:00
|
|
|
elf_merge_gnu_property_list (info, first_pbfd, listp);
|
2017-04-03 17:03:14 +02:00
|
|
|
|
|
|
|
if (list != NULL)
|
|
|
|
{
|
2017-11-20 16:32:55 +01:00
|
|
|
/* Discard the .note.gnu.property section in this bfd. */
|
2017-04-03 17:03:14 +02:00
|
|
|
sec = bfd_get_section_by_name (abfd,
|
|
|
|
NOTE_GNU_PROPERTY_SECTION_NAME);
|
2017-11-20 16:32:55 +01:00
|
|
|
if (sec != NULL)
|
|
|
|
sec->output_section = bfd_abs_section_ptr;
|
2017-04-03 17:03:14 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Rewrite .note.gnu.property section so that GNU properties are
|
|
|
|
always sorted by type even if input GNU properties aren't sorted. */
|
|
|
|
if (first_pbfd != NULL)
|
|
|
|
{
|
|
|
|
unsigned int size;
|
|
|
|
unsigned int descsz;
|
|
|
|
bfd_byte *contents;
|
|
|
|
Elf_External_Note *e_note;
|
|
|
|
unsigned int align_size = bed->s->elfclass == ELFCLASS64 ? 8 : 4;
|
|
|
|
|
|
|
|
sec = bfd_get_section_by_name (first_pbfd,
|
|
|
|
NOTE_GNU_PROPERTY_SECTION_NAME);
|
2017-11-20 16:32:55 +01:00
|
|
|
BFD_ASSERT (sec != NULL);
|
2017-04-03 17:03:14 +02:00
|
|
|
|
|
|
|
/* Update stack size in .note.gnu.property with -z stack-size=N
|
|
|
|
if N > 0. */
|
|
|
|
if (info->stacksize > 0)
|
|
|
|
{
|
|
|
|
elf_property *p;
|
|
|
|
bfd_vma stacksize = info->stacksize;
|
|
|
|
|
|
|
|
p = _bfd_elf_get_property (first_pbfd, GNU_PROPERTY_STACK_SIZE,
|
|
|
|
align_size);
|
|
|
|
if (p->pr_kind == property_unknown)
|
|
|
|
{
|
|
|
|
/* Create GNU_PROPERTY_STACK_SIZE. */
|
|
|
|
p->u.number = stacksize;
|
|
|
|
p->pr_kind = property_number;
|
|
|
|
}
|
|
|
|
else if (stacksize > p->u.number)
|
|
|
|
p->u.number = stacksize;
|
|
|
|
}
|
|
|
|
else if (elf_properties (first_pbfd) == NULL)
|
|
|
|
{
|
|
|
|
/* Discard .note.gnu.property section if all properties have
|
|
|
|
been removed. */
|
|
|
|
sec->output_section = bfd_abs_section_ptr;
|
2017-04-27 18:07:23 +02:00
|
|
|
return NULL;
|
2017-04-03 17:03:14 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Compute the section size. */
|
|
|
|
descsz = offsetof (Elf_External_Note, name[sizeof "GNU"]);
|
|
|
|
descsz = (descsz + 3) & -(unsigned int) 4;
|
|
|
|
size = descsz;
|
|
|
|
for (list = elf_properties (first_pbfd);
|
|
|
|
list != NULL;
|
|
|
|
list = list->next)
|
|
|
|
{
|
|
|
|
/* There are 4 byte type + 4 byte datasz for each property. */
|
|
|
|
size += 4 + 4 + list->property.pr_datasz;
|
|
|
|
/* Align each property. */
|
|
|
|
size = (size + (align_size - 1)) & ~(align_size - 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Update .note.gnu.property section now. */
|
|
|
|
sec->size = size;
|
|
|
|
contents = (bfd_byte *) bfd_zalloc (first_pbfd, size);
|
|
|
|
|
|
|
|
e_note = (Elf_External_Note *) contents;
|
|
|
|
bfd_h_put_32 (first_pbfd, sizeof "GNU", &e_note->namesz);
|
|
|
|
bfd_h_put_32 (first_pbfd, size - descsz, &e_note->descsz);
|
|
|
|
bfd_h_put_32 (first_pbfd, NT_GNU_PROPERTY_TYPE_0, &e_note->type);
|
|
|
|
memcpy (e_note->name, "GNU", sizeof "GNU");
|
|
|
|
|
|
|
|
size = descsz;
|
|
|
|
for (list = elf_properties (first_pbfd);
|
|
|
|
list != NULL;
|
|
|
|
list = list->next)
|
|
|
|
{
|
|
|
|
/* There are 4 byte type + 4 byte datasz for each property. */
|
|
|
|
bfd_h_put_32 (first_pbfd, list->property.pr_type,
|
|
|
|
contents + size);
|
|
|
|
bfd_h_put_32 (first_pbfd, list->property.pr_datasz,
|
|
|
|
contents + size + 4);
|
|
|
|
size += 4 + 4;
|
|
|
|
|
|
|
|
/* Write out property value. */
|
|
|
|
switch (list->property.pr_kind)
|
|
|
|
{
|
|
|
|
case property_number:
|
|
|
|
switch (list->property.pr_datasz)
|
|
|
|
{
|
|
|
|
default:
|
|
|
|
/* Never should happen. */
|
|
|
|
abort ();
|
|
|
|
|
|
|
|
case 0:
|
|
|
|
break;
|
|
|
|
|
|
|
|
case 4:
|
|
|
|
bfd_h_put_32 (first_pbfd, list->property.u.number,
|
|
|
|
contents + size);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case 8:
|
|
|
|
bfd_h_put_64 (first_pbfd, list->property.u.number,
|
|
|
|
contents + size);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
/* Never should happen. */
|
|
|
|
abort ();
|
|
|
|
}
|
|
|
|
size += list->property.pr_datasz;
|
|
|
|
|
|
|
|
/* Align each property. */
|
|
|
|
size = (size + (align_size - 1)) & ~ (align_size - 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Cache the section contents for elf_link_input_bfd. */
|
|
|
|
elf_section_data (sec)->this_hdr.contents = contents;
|
2017-08-27 04:22:26 +02:00
|
|
|
|
|
|
|
/* If GNU_PROPERTY_NO_COPY_ON_PROTECTED is set, protected data
|
|
|
|
symbol is defined in the shared object. */
|
|
|
|
if (elf_has_no_copy_on_protected (first_pbfd))
|
|
|
|
info->extern_protected_data = FALSE;
|
2017-04-03 17:03:14 +02:00
|
|
|
}
|
2017-04-27 18:07:23 +02:00
|
|
|
|
|
|
|
return first_pbfd;
|
2017-04-03 17:03:14 +02:00
|
|
|
}
|