mirror of
https://sourceware.org/git/binutils-gdb.git
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fa62aafb7d
bfd_close ought to always call iovec->bclose so that cache_bclose is
called. If not, bfd_last_cache will be left pointing at freed memory.
This bug was found by oss-fuzz with the trigger being an old bug in
the ia64-vms support. Given a file of the "wrong" size,
elf64_vms_close_and_cleanup attempted to extend it, leading to an
error since the file was opened read-only by nm. nm bad_file bad_file
then hit the use-after-free when opening the second file.
commit 8219cab3f8 fixed multiple bugs of this type in bfd_close and
bfd_close_all_done, but didn't go quite far enough.
* elf64-ia64-vms.c (elf64_vms_close_and_cleanup): Don't
attempt to extend read-only files.
* opncls.c (bfd_close_all_done): Always call _close_and_cleanup.
An old bug in the ia64-vms support can be used to tickle another bug
in bfd_close_all_done. If _close_and_cleanup returns an error,
2049 lines
54 KiB
C
2049 lines
54 KiB
C
/* opncls.c -- open and close a BFD.
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Copyright (C) 1990-2023 Free Software Foundation, Inc.
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Written by Cygnus Support.
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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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#include "sysdep.h"
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#include "bfd.h"
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#include "objalloc.h"
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#include "libbfd.h"
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#include "libiberty.h"
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#include "elf-bfd.h"
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#ifndef S_IXUSR
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#define S_IXUSR 0100 /* Execute by owner. */
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#endif
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#ifndef S_IXGRP
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#define S_IXGRP 0010 /* Execute by group. */
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#endif
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#ifndef S_IXOTH
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#define S_IXOTH 0001 /* Execute by others. */
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#endif
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/*
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SECTION
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Opening and closing BFDs
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SUBSECTION
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Functions for opening and closing
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*/
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/* Counters used to initialize the bfd identifier. */
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static unsigned int bfd_id_counter = 0;
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static unsigned int bfd_reserved_id_counter = 0;
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/*
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EXTERNAL
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.{* Set to N to open the next N BFDs using an alternate id space. *}
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.extern unsigned int bfd_use_reserved_id;
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.
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*/
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unsigned int bfd_use_reserved_id = 0;
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/* fdopen is a loser -- we should use stdio exclusively. Unfortunately
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if we do that we can't use fcntl. */
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/*
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INTERNAL_FUNCTION
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_bfd_new_bfd
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SYNOPSIS
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bfd *_bfd_new_bfd (void);
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DESCRIPTION
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Return a new BFD. All BFD's are allocated through this routine.
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*/
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bfd *
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_bfd_new_bfd (void)
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{
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bfd *nbfd;
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nbfd = (bfd *) bfd_zmalloc (sizeof (bfd));
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if (nbfd == NULL)
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return NULL;
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if (bfd_use_reserved_id)
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{
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nbfd->id = --bfd_reserved_id_counter;
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--bfd_use_reserved_id;
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}
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else
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nbfd->id = bfd_id_counter++;
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nbfd->memory = objalloc_create ();
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if (nbfd->memory == NULL)
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{
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bfd_set_error (bfd_error_no_memory);
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free (nbfd);
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return NULL;
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}
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nbfd->arch_info = &bfd_default_arch_struct;
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if (!bfd_hash_table_init_n (& nbfd->section_htab, bfd_section_hash_newfunc,
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sizeof (struct section_hash_entry), 13))
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{
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objalloc_free ((struct objalloc *) nbfd->memory);
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free (nbfd);
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return NULL;
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}
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nbfd->archive_plugin_fd = -1;
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return nbfd;
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}
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static const struct bfd_iovec opncls_iovec;
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/*
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INTERNAL_FUNCTION
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_bfd_new_bfd_contained_in
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SYNOPSIS
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bfd *_bfd_new_bfd_contained_in (bfd *);
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DESCRIPTION
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Allocate a new BFD as a member of archive OBFD.
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*/
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bfd *
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_bfd_new_bfd_contained_in (bfd *obfd)
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{
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bfd *nbfd;
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/* Nested archives in bims are unsupported. */
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if ((obfd->flags & BFD_IN_MEMORY) != 0)
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{
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bfd_set_error (bfd_error_malformed_archive);
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return NULL;
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}
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nbfd = _bfd_new_bfd ();
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if (nbfd == NULL)
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return NULL;
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nbfd->xvec = obfd->xvec;
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nbfd->iovec = obfd->iovec;
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if (obfd->iovec == &opncls_iovec)
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nbfd->iostream = obfd->iostream;
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nbfd->my_archive = obfd;
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nbfd->direction = read_direction;
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nbfd->target_defaulted = obfd->target_defaulted;
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nbfd->lto_output = obfd->lto_output;
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nbfd->no_export = obfd->no_export;
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return nbfd;
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}
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/* Delete a BFD. */
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static void
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_bfd_delete_bfd (bfd *abfd)
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{
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/* Give the target _bfd_free_cached_info a chance to free memory. */
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if (abfd->memory && abfd->xvec)
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bfd_free_cached_info (abfd);
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/* The target _bfd_free_cached_info may not have done anything.. */
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if (abfd->memory)
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{
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bfd_hash_table_free (&abfd->section_htab);
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objalloc_free ((struct objalloc *) abfd->memory);
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}
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else
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free ((char *) bfd_get_filename (abfd));
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free (abfd->arelt_data);
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free (abfd);
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}
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/*
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INTERNAL_FUNCTION
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_bfd_free_cached_info
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SYNOPSIS
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bool _bfd_free_cached_info (bfd *);
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DESCRIPTION
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Free objalloc memory.
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*/
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bool
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_bfd_free_cached_info (bfd *abfd)
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{
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if (abfd->memory)
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{
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const char *filename = bfd_get_filename (abfd);
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if (filename)
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{
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/* We can't afford to lose the bfd filename when freeing
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abfd->memory, because that would kill the cache.c scheme
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of closing and reopening files in order to limit the
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number of open files. To reopen, you need the filename.
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And indeed _bfd_compute_and_write_armap calls
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_bfd_free_cached_info to free up space used by symbols
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and by check_format_matches. Which we want to continue
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doing to handle very large archives. Later the archive
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elements are copied, which might require reopening files.
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We also want to keep using objalloc memory for the
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filename since that allows the name to be updated
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without either leaking memory or implementing some sort
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of reference counted string for copies of the filename. */
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size_t len = strlen (filename) + 1;
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char *copy = bfd_malloc (len);
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if (copy == NULL)
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return false;
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memcpy (copy, filename, len);
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abfd->filename = copy;
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}
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bfd_hash_table_free (&abfd->section_htab);
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objalloc_free ((struct objalloc *) abfd->memory);
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abfd->sections = NULL;
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abfd->section_last = NULL;
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abfd->outsymbols = NULL;
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abfd->tdata.any = NULL;
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abfd->usrdata = NULL;
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abfd->memory = NULL;
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}
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return true;
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}
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/*
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FUNCTION
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bfd_fopen
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SYNOPSIS
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bfd *bfd_fopen (const char *filename, const char *target,
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const char *mode, int fd);
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DESCRIPTION
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Open the file @var{filename} with the target @var{target}.
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Return a pointer to the created BFD. If @var{fd} is not -1,
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then <<fdopen>> is used to open the file; otherwise, <<fopen>>
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is used. @var{mode} is passed directly to <<fopen>> or
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<<fdopen>>.
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Calls <<bfd_find_target>>, so @var{target} is interpreted as by
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that function.
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The new BFD is marked as cacheable iff @var{fd} is -1.
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If <<NULL>> is returned then an error has occured. Possible errors
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are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or
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<<system_call>> error.
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On error, @var{fd} is always closed.
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A copy of the @var{filename} argument is stored in the newly created
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BFD. It can be accessed via the bfd_get_filename() macro.
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*/
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bfd *
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bfd_fopen (const char *filename, const char *target, const char *mode, int fd)
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{
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bfd *nbfd;
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const bfd_target *target_vec;
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nbfd = _bfd_new_bfd ();
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if (nbfd == NULL)
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{
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if (fd != -1)
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close (fd);
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return NULL;
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}
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target_vec = bfd_find_target (target, nbfd);
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if (target_vec == NULL)
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{
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if (fd != -1)
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close (fd);
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_bfd_delete_bfd (nbfd);
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return NULL;
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}
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#ifdef HAVE_FDOPEN
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if (fd != -1)
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nbfd->iostream = fdopen (fd, mode);
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else
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#endif
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nbfd->iostream = _bfd_real_fopen (filename, mode);
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if (nbfd->iostream == NULL)
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{
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bfd_set_error (bfd_error_system_call);
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if (fd != -1)
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close (fd);
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_bfd_delete_bfd (nbfd);
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return NULL;
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}
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/* OK, put everything where it belongs. */
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/* PR 11983: Do not cache the original filename, but
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rather make a copy - the original might go away. */
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if (!bfd_set_filename (nbfd, filename))
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{
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fclose (nbfd->iostream);
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_bfd_delete_bfd (nbfd);
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return NULL;
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}
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/* Figure out whether the user is opening the file for reading,
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writing, or both, by looking at the MODE argument. */
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if ((mode[0] == 'r' || mode[0] == 'w' || mode[0] == 'a')
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&& mode[1] == '+')
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nbfd->direction = both_direction;
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else if (mode[0] == 'r')
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nbfd->direction = read_direction;
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else
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nbfd->direction = write_direction;
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if (!bfd_cache_init (nbfd))
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{
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fclose (nbfd->iostream);
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_bfd_delete_bfd (nbfd);
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return NULL;
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}
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nbfd->opened_once = true;
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/* If we opened the file by name, mark it cacheable; we can close it
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and reopen it later. However, if a file descriptor was provided,
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then it may have been opened with special flags that make it
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unsafe to close and reopen the file. */
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if (fd == -1)
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(void) bfd_set_cacheable (nbfd, true);
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return nbfd;
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}
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/*
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FUNCTION
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bfd_openr
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SYNOPSIS
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bfd *bfd_openr (const char *filename, const char *target);
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DESCRIPTION
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Open the file @var{filename} (using <<fopen>>) with the target
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@var{target}. Return a pointer to the created BFD.
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Calls <<bfd_find_target>>, so @var{target} is interpreted as by
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that function.
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If <<NULL>> is returned then an error has occured. Possible errors
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are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or
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<<system_call>> error.
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A copy of the @var{filename} argument is stored in the newly created
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BFD. It can be accessed via the bfd_get_filename() macro.
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*/
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bfd *
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bfd_openr (const char *filename, const char *target)
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{
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return bfd_fopen (filename, target, FOPEN_RB, -1);
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}
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/* Don't try to `optimize' this function:
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o - We lock using stack space so that interrupting the locking
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won't cause a storage leak.
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o - We open the file stream last, since we don't want to have to
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close it if anything goes wrong. Closing the stream means closing
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the file descriptor too, even though we didn't open it. */
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/*
|
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FUNCTION
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bfd_fdopenr
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SYNOPSIS
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bfd *bfd_fdopenr (const char *filename, const char *target, int fd);
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|
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DESCRIPTION
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<<bfd_fdopenr>> is to <<bfd_fopenr>> much like <<fdopen>> is to
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<<fopen>>. It opens a BFD on a file already described by the
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@var{fd} supplied.
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|
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When the file is later <<bfd_close>>d, the file descriptor will
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be closed. If the caller desires that this file descriptor be
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cached by BFD (opened as needed, closed as needed to free
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descriptors for other opens), with the supplied @var{fd} used as
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an initial file descriptor (but subject to closure at any time),
|
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call bfd_set_cacheable(bfd, 1) on the returned BFD. The default
|
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is to assume no caching; the file descriptor will remain open
|
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until <<bfd_close>>, and will not be affected by BFD operations
|
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on other files.
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||
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Possible errors are <<bfd_error_no_memory>>,
|
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<<bfd_error_invalid_target>> and <<bfd_error_system_call>>.
|
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|
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On error, @var{fd} is closed.
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|
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A copy of the @var{filename} argument is stored in the newly created
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BFD. It can be accessed via the bfd_get_filename() macro.
|
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*/
|
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|
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bfd *
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bfd_fdopenr (const char *filename, const char *target, int fd)
|
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{
|
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const char *mode;
|
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#if defined(HAVE_FCNTL) && defined(F_GETFL)
|
||
int fdflags;
|
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#endif
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||
|
||
#if ! defined(HAVE_FCNTL) || ! defined(F_GETFL)
|
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mode = FOPEN_RUB; /* Assume full access. */
|
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#else
|
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fdflags = fcntl (fd, F_GETFL, NULL);
|
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if (fdflags == -1)
|
||
{
|
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int save = errno;
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|
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close (fd);
|
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errno = save;
|
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bfd_set_error (bfd_error_system_call);
|
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return NULL;
|
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}
|
||
|
||
/* (O_ACCMODE) parens are to avoid Ultrix header file bug. */
|
||
switch (fdflags & (O_ACCMODE))
|
||
{
|
||
case O_RDONLY: mode = FOPEN_RB; break;
|
||
case O_WRONLY: mode = FOPEN_RUB; break;
|
||
case O_RDWR: mode = FOPEN_RUB; break;
|
||
default: abort ();
|
||
}
|
||
#endif
|
||
|
||
return bfd_fopen (filename, target, mode, fd);
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_fdopenw
|
||
|
||
SYNOPSIS
|
||
bfd *bfd_fdopenw (const char *filename, const char *target, int fd);
|
||
|
||
DESCRIPTION
|
||
<<bfd_fdopenw>> is exactly like <<bfd_fdopenr>> with the exception that
|
||
the resulting BFD is suitable for output.
|
||
*/
|
||
|
||
bfd *
|
||
bfd_fdopenw (const char *filename, const char *target, int fd)
|
||
{
|
||
bfd *out = bfd_fdopenr (filename, target, fd);
|
||
|
||
if (out != NULL)
|
||
{
|
||
if (!bfd_write_p (out))
|
||
{
|
||
close (fd);
|
||
_bfd_delete_bfd (out);
|
||
out = NULL;
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
}
|
||
else
|
||
out->direction = write_direction;
|
||
}
|
||
|
||
return out;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_openstreamr
|
||
|
||
SYNOPSIS
|
||
bfd *bfd_openstreamr (const char * filename, const char * target,
|
||
void * stream);
|
||
|
||
DESCRIPTION
|
||
Open a BFD for read access on an existing stdio stream. When
|
||
the BFD is passed to <<bfd_close>>, the stream will be closed.
|
||
|
||
A copy of the @var{filename} argument is stored in the newly created
|
||
BFD. It can be accessed via the bfd_get_filename() macro.
|
||
*/
|
||
|
||
bfd *
|
||
bfd_openstreamr (const char *filename, const char *target, void *streamarg)
|
||
{
|
||
FILE *stream = (FILE *) streamarg;
|
||
bfd *nbfd;
|
||
const bfd_target *target_vec;
|
||
|
||
nbfd = _bfd_new_bfd ();
|
||
if (nbfd == NULL)
|
||
return NULL;
|
||
|
||
target_vec = bfd_find_target (target, nbfd);
|
||
if (target_vec == NULL)
|
||
{
|
||
_bfd_delete_bfd (nbfd);
|
||
return NULL;
|
||
}
|
||
|
||
nbfd->iostream = stream;
|
||
/* PR 11983: Do not cache the original filename, but
|
||
rather make a copy - the original might go away. */
|
||
if (!bfd_set_filename (nbfd, filename))
|
||
{
|
||
_bfd_delete_bfd (nbfd);
|
||
return NULL;
|
||
}
|
||
nbfd->direction = read_direction;
|
||
|
||
if (! bfd_cache_init (nbfd))
|
||
{
|
||
_bfd_delete_bfd (nbfd);
|
||
return NULL;
|
||
}
|
||
|
||
return nbfd;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_openr_iovec
|
||
|
||
SYNOPSIS
|
||
bfd *bfd_openr_iovec (const char *filename, const char *target,
|
||
void *(*open_func) (struct bfd *nbfd,
|
||
void *open_closure),
|
||
void *open_closure,
|
||
file_ptr (*pread_func) (struct bfd *nbfd,
|
||
void *stream,
|
||
void *buf,
|
||
file_ptr nbytes,
|
||
file_ptr offset),
|
||
int (*close_func) (struct bfd *nbfd,
|
||
void *stream),
|
||
int (*stat_func) (struct bfd *abfd,
|
||
void *stream,
|
||
struct stat *sb));
|
||
|
||
DESCRIPTION
|
||
Create and return a BFD backed by a read-only @var{stream}.
|
||
The @var{stream} is created using @var{open_func}, accessed using
|
||
@var{pread_func} and destroyed using @var{close_func}.
|
||
|
||
Calls <<bfd_find_target>>, so @var{target} is interpreted as by
|
||
that function.
|
||
|
||
Calls @var{open_func} (which can call <<bfd_zalloc>> and
|
||
<<bfd_get_filename>>) to obtain the read-only stream backing
|
||
the BFD. @var{open_func} either succeeds returning the
|
||
non-<<NULL>> @var{stream}, or fails returning <<NULL>>
|
||
(setting <<bfd_error>>).
|
||
|
||
Calls @var{pread_func} to request @var{nbytes} of data from
|
||
@var{stream} starting at @var{offset} (e.g., via a call to
|
||
<<bfd_read>>). @var{pread_func} either succeeds returning the
|
||
number of bytes read (which can be less than @var{nbytes} when
|
||
end-of-file), or fails returning -1 (setting <<bfd_error>>).
|
||
|
||
Calls @var{close_func} when the BFD is later closed using
|
||
<<bfd_close>>. @var{close_func} either succeeds returning 0, or
|
||
fails returning -1 (setting <<bfd_error>>).
|
||
|
||
Calls @var{stat_func} to fill in a stat structure for bfd_stat,
|
||
bfd_get_size, and bfd_get_mtime calls. @var{stat_func} returns 0
|
||
on success, or returns -1 on failure (setting <<bfd_error>>).
|
||
|
||
If <<bfd_openr_iovec>> returns <<NULL>> then an error has
|
||
occurred. Possible errors are <<bfd_error_no_memory>>,
|
||
<<bfd_error_invalid_target>> and <<bfd_error_system_call>>.
|
||
|
||
A copy of the @var{filename} argument is stored in the newly created
|
||
BFD. It can be accessed via the bfd_get_filename() macro.
|
||
*/
|
||
|
||
struct opncls
|
||
{
|
||
void *stream;
|
||
file_ptr (*pread) (struct bfd *abfd, void *stream, void *buf,
|
||
file_ptr nbytes, file_ptr offset);
|
||
int (*close) (struct bfd *abfd, void *stream);
|
||
int (*stat) (struct bfd *abfd, void *stream, struct stat *sb);
|
||
file_ptr where;
|
||
};
|
||
|
||
static file_ptr
|
||
opncls_btell (struct bfd *abfd)
|
||
{
|
||
struct opncls *vec = (struct opncls *) abfd->iostream;
|
||
return vec->where;
|
||
}
|
||
|
||
static int
|
||
opncls_bseek (struct bfd *abfd, file_ptr offset, int whence)
|
||
{
|
||
struct opncls *vec = (struct opncls *) abfd->iostream;
|
||
switch (whence)
|
||
{
|
||
case SEEK_SET: vec->where = offset; break;
|
||
case SEEK_CUR: vec->where += offset; break;
|
||
case SEEK_END: return -1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
static file_ptr
|
||
opncls_bread (struct bfd *abfd, void *buf, file_ptr nbytes)
|
||
{
|
||
struct opncls *vec = (struct opncls *) abfd->iostream;
|
||
file_ptr nread = (vec->pread) (abfd, vec->stream, buf, nbytes, vec->where);
|
||
|
||
if (nread < 0)
|
||
return nread;
|
||
vec->where += nread;
|
||
return nread;
|
||
}
|
||
|
||
static file_ptr
|
||
opncls_bwrite (struct bfd *abfd ATTRIBUTE_UNUSED,
|
||
const void *where ATTRIBUTE_UNUSED,
|
||
file_ptr nbytes ATTRIBUTE_UNUSED)
|
||
{
|
||
return -1;
|
||
}
|
||
|
||
static int
|
||
opncls_bclose (struct bfd *abfd)
|
||
{
|
||
struct opncls *vec = (struct opncls *) abfd->iostream;
|
||
/* Since the VEC's memory is bound to the bfd deleting the bfd will
|
||
free it. */
|
||
int status = 0;
|
||
|
||
if (vec->close != NULL)
|
||
status = (vec->close) (abfd, vec->stream);
|
||
abfd->iostream = NULL;
|
||
return status;
|
||
}
|
||
|
||
static int
|
||
opncls_bflush (struct bfd *abfd ATTRIBUTE_UNUSED)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
opncls_bstat (struct bfd *abfd, struct stat *sb)
|
||
{
|
||
struct opncls *vec = (struct opncls *) abfd->iostream;
|
||
|
||
memset (sb, 0, sizeof (*sb));
|
||
if (vec->stat == NULL)
|
||
return 0;
|
||
|
||
return (vec->stat) (abfd, vec->stream, sb);
|
||
}
|
||
|
||
static void *
|
||
opncls_bmmap (struct bfd *abfd ATTRIBUTE_UNUSED,
|
||
void *addr ATTRIBUTE_UNUSED,
|
||
bfd_size_type len ATTRIBUTE_UNUSED,
|
||
int prot ATTRIBUTE_UNUSED,
|
||
int flags ATTRIBUTE_UNUSED,
|
||
file_ptr offset ATTRIBUTE_UNUSED,
|
||
void **map_addr ATTRIBUTE_UNUSED,
|
||
bfd_size_type *map_len ATTRIBUTE_UNUSED)
|
||
{
|
||
return (void *) -1;
|
||
}
|
||
|
||
static const struct bfd_iovec opncls_iovec =
|
||
{
|
||
&opncls_bread, &opncls_bwrite, &opncls_btell, &opncls_bseek,
|
||
&opncls_bclose, &opncls_bflush, &opncls_bstat, &opncls_bmmap
|
||
};
|
||
|
||
bfd *
|
||
bfd_openr_iovec (const char *filename, const char *target,
|
||
void *(*open_p) (struct bfd *, void *),
|
||
void *open_closure,
|
||
file_ptr (*pread_p) (struct bfd *, void *, void *,
|
||
file_ptr, file_ptr),
|
||
int (*close_p) (struct bfd *, void *),
|
||
int (*stat_p) (struct bfd *, void *, struct stat *))
|
||
{
|
||
bfd *nbfd;
|
||
const bfd_target *target_vec;
|
||
struct opncls *vec;
|
||
void *stream;
|
||
|
||
nbfd = _bfd_new_bfd ();
|
||
if (nbfd == NULL)
|
||
return NULL;
|
||
|
||
target_vec = bfd_find_target (target, nbfd);
|
||
if (target_vec == NULL)
|
||
{
|
||
_bfd_delete_bfd (nbfd);
|
||
return NULL;
|
||
}
|
||
|
||
/* PR 11983: Do not cache the original filename, but
|
||
rather make a copy - the original might go away. */
|
||
if (!bfd_set_filename (nbfd, filename))
|
||
{
|
||
_bfd_delete_bfd (nbfd);
|
||
return NULL;
|
||
}
|
||
nbfd->direction = read_direction;
|
||
|
||
/* `open_p (...)' would get expanded by an the open(2) syscall macro. */
|
||
stream = (*open_p) (nbfd, open_closure);
|
||
if (stream == NULL)
|
||
{
|
||
_bfd_delete_bfd (nbfd);
|
||
return NULL;
|
||
}
|
||
|
||
vec = (struct opncls *) bfd_zalloc (nbfd, sizeof (struct opncls));
|
||
vec->stream = stream;
|
||
vec->pread = pread_p;
|
||
vec->close = close_p;
|
||
vec->stat = stat_p;
|
||
|
||
nbfd->iovec = &opncls_iovec;
|
||
nbfd->iostream = vec;
|
||
|
||
return nbfd;
|
||
}
|
||
|
||
/* bfd_openw -- open for writing.
|
||
Returns a pointer to a freshly-allocated BFD on success, or NULL.
|
||
|
||
See comment by bfd_fdopenr before you try to modify this function. */
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_openw
|
||
|
||
SYNOPSIS
|
||
bfd *bfd_openw (const char *filename, const char *target);
|
||
|
||
DESCRIPTION
|
||
Create a BFD, associated with file @var{filename}, using the
|
||
file format @var{target}, and return a pointer to it.
|
||
|
||
Possible errors are <<bfd_error_system_call>>, <<bfd_error_no_memory>>,
|
||
<<bfd_error_invalid_target>>.
|
||
|
||
A copy of the @var{filename} argument is stored in the newly created
|
||
BFD. It can be accessed via the bfd_get_filename() macro.
|
||
*/
|
||
|
||
bfd *
|
||
bfd_openw (const char *filename, const char *target)
|
||
{
|
||
bfd *nbfd;
|
||
const bfd_target *target_vec;
|
||
|
||
/* nbfd has to point to head of malloc'ed block so that bfd_close may
|
||
reclaim it correctly. */
|
||
nbfd = _bfd_new_bfd ();
|
||
if (nbfd == NULL)
|
||
return NULL;
|
||
|
||
target_vec = bfd_find_target (target, nbfd);
|
||
if (target_vec == NULL)
|
||
{
|
||
_bfd_delete_bfd (nbfd);
|
||
return NULL;
|
||
}
|
||
|
||
/* PR 11983: Do not cache the original filename, but
|
||
rather make a copy - the original might go away. */
|
||
if (!bfd_set_filename (nbfd, filename))
|
||
{
|
||
_bfd_delete_bfd (nbfd);
|
||
return NULL;
|
||
}
|
||
nbfd->direction = write_direction;
|
||
|
||
if (bfd_open_file (nbfd) == NULL)
|
||
{
|
||
/* File not writeable, etc. */
|
||
bfd_set_error (bfd_error_system_call);
|
||
_bfd_delete_bfd (nbfd);
|
||
return NULL;
|
||
}
|
||
|
||
return nbfd;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_elf_bfd_from_remote_memory
|
||
|
||
SYNOPSIS
|
||
bfd *bfd_elf_bfd_from_remote_memory
|
||
(bfd *templ, bfd_vma ehdr_vma, bfd_size_type size, bfd_vma *loadbasep,
|
||
int (*target_read_memory)
|
||
(bfd_vma vma, bfd_byte *myaddr, bfd_size_type len));
|
||
|
||
DESCRIPTION
|
||
Create a new BFD as if by bfd_openr. Rather than opening a
|
||
file, reconstruct an ELF file by reading the segments out of
|
||
remote memory based on the ELF file header at EHDR_VMA and the
|
||
ELF program headers it points to. If non-zero, SIZE is the
|
||
known extent of the object. If not null, *LOADBASEP is filled
|
||
in with the difference between the VMAs from which the
|
||
segments were read, and the VMAs the file headers (and hence
|
||
BFD's idea of each section's VMA) put them at.
|
||
|
||
The function TARGET_READ_MEMORY is called to copy LEN bytes
|
||
from the remote memory at target address VMA into the local
|
||
buffer at MYADDR; it should return zero on success or an
|
||
errno code on failure. TEMPL must be a BFD for an ELF
|
||
target with the word size and byte order found in the remote
|
||
memory.
|
||
*/
|
||
|
||
bfd *
|
||
bfd_elf_bfd_from_remote_memory
|
||
(bfd *templ,
|
||
bfd_vma ehdr_vma,
|
||
bfd_size_type size,
|
||
bfd_vma *loadbasep,
|
||
int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type))
|
||
{
|
||
if (bfd_get_flavour (templ) != bfd_target_elf_flavour)
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return NULL;
|
||
}
|
||
return (*get_elf_backend_data (templ)->elf_backend_bfd_from_remote_memory)
|
||
(templ, ehdr_vma, size, loadbasep, target_read_memory);
|
||
}
|
||
|
||
static inline void
|
||
_maybe_make_executable (bfd * abfd)
|
||
{
|
||
/* If the file was open for writing and is now executable,
|
||
make it so. */
|
||
if (abfd->direction == write_direction
|
||
&& (abfd->flags & (EXEC_P | DYNAMIC)) != 0)
|
||
{
|
||
struct stat buf;
|
||
|
||
if (stat (bfd_get_filename (abfd), &buf) == 0
|
||
/* Do not attempt to change non-regular files. This is
|
||
here especially for configure scripts and kernel builds
|
||
which run tests with "ld [...] -o /dev/null". */
|
||
&& S_ISREG(buf.st_mode))
|
||
{
|
||
unsigned int mask = umask (0);
|
||
|
||
umask (mask);
|
||
chmod (bfd_get_filename (abfd),
|
||
(0777
|
||
& (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask))));
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_close
|
||
|
||
SYNOPSIS
|
||
bool bfd_close (bfd *abfd);
|
||
|
||
DESCRIPTION
|
||
Close a BFD. If the BFD was open for writing, then pending
|
||
operations are completed and the file written out and closed.
|
||
If the created file is executable, then <<chmod>> is called
|
||
to mark it as such.
|
||
|
||
All memory attached to the BFD is released.
|
||
|
||
The file descriptor associated with the BFD is closed (even
|
||
if it was passed in to BFD by <<bfd_fdopenr>>).
|
||
|
||
<<TRUE>> is returned if all is ok, otherwise <<FALSE>>.
|
||
*/
|
||
|
||
bool
|
||
bfd_close (bfd *abfd)
|
||
{
|
||
bool ret = (!bfd_write_p (abfd)
|
||
|| BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)));
|
||
|
||
return bfd_close_all_done (abfd) && ret;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_close_all_done
|
||
|
||
SYNOPSIS
|
||
bool bfd_close_all_done (bfd *);
|
||
|
||
DESCRIPTION
|
||
Close a BFD. Differs from <<bfd_close>> since it does not
|
||
complete any pending operations. This routine would be used
|
||
if the application had just used BFD for swapping and didn't
|
||
want to use any of the writing code.
|
||
|
||
If the created file is executable, then <<chmod>> is called
|
||
to mark it as such.
|
||
|
||
All memory attached to the BFD is released.
|
||
|
||
<<TRUE>> is returned if all is ok, otherwise <<FALSE>>.
|
||
*/
|
||
|
||
bool
|
||
bfd_close_all_done (bfd *abfd)
|
||
{
|
||
bool ret = BFD_SEND (abfd, _close_and_cleanup, (abfd));
|
||
|
||
if (abfd->iovec != NULL)
|
||
ret &= abfd->iovec->bclose (abfd) == 0;
|
||
|
||
if (ret)
|
||
_maybe_make_executable (abfd);
|
||
|
||
_bfd_delete_bfd (abfd);
|
||
free (_bfd_error_buf);
|
||
_bfd_error_buf = NULL;
|
||
|
||
return ret;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_create
|
||
|
||
SYNOPSIS
|
||
bfd *bfd_create (const char *filename, bfd *templ);
|
||
|
||
DESCRIPTION
|
||
Create a new BFD in the manner of <<bfd_openw>>, but without
|
||
opening a file. The new BFD takes the target from the target
|
||
used by @var{templ}. The format is always set to <<bfd_object>>.
|
||
|
||
A copy of the @var{filename} argument is stored in the newly created
|
||
BFD. It can be accessed via the bfd_get_filename() macro.
|
||
*/
|
||
|
||
bfd *
|
||
bfd_create (const char *filename, bfd *templ)
|
||
{
|
||
bfd *nbfd;
|
||
|
||
nbfd = _bfd_new_bfd ();
|
||
if (nbfd == NULL)
|
||
return NULL;
|
||
/* PR 11983: Do not cache the original filename, but
|
||
rather make a copy - the original might go away. */
|
||
if (!bfd_set_filename (nbfd, filename))
|
||
{
|
||
_bfd_delete_bfd (nbfd);
|
||
return NULL;
|
||
}
|
||
if (templ)
|
||
nbfd->xvec = templ->xvec;
|
||
nbfd->direction = no_direction;
|
||
bfd_set_format (nbfd, bfd_object);
|
||
|
||
return nbfd;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_make_writable
|
||
|
||
SYNOPSIS
|
||
bool bfd_make_writable (bfd *abfd);
|
||
|
||
DESCRIPTION
|
||
Takes a BFD as created by <<bfd_create>> and converts it
|
||
into one like as returned by <<bfd_openw>>. It does this
|
||
by converting the BFD to BFD_IN_MEMORY. It's assumed that
|
||
you will call <<bfd_make_readable>> on this bfd later.
|
||
|
||
<<TRUE>> is returned if all is ok, otherwise <<FALSE>>.
|
||
*/
|
||
|
||
bool
|
||
bfd_make_writable (bfd *abfd)
|
||
{
|
||
struct bfd_in_memory *bim;
|
||
|
||
if (abfd->direction != no_direction)
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return false;
|
||
}
|
||
|
||
bim = (struct bfd_in_memory *) bfd_malloc (sizeof (struct bfd_in_memory));
|
||
if (bim == NULL)
|
||
return false; /* bfd_error already set. */
|
||
abfd->iostream = bim;
|
||
/* bfd_write will grow these as needed. */
|
||
bim->size = 0;
|
||
bim->buffer = 0;
|
||
|
||
abfd->flags |= BFD_IN_MEMORY;
|
||
abfd->iovec = &_bfd_memory_iovec;
|
||
abfd->origin = 0;
|
||
abfd->direction = write_direction;
|
||
abfd->where = 0;
|
||
|
||
return true;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_make_readable
|
||
|
||
SYNOPSIS
|
||
bool bfd_make_readable (bfd *abfd);
|
||
|
||
DESCRIPTION
|
||
Takes a BFD as created by <<bfd_create>> and
|
||
<<bfd_make_writable>> and converts it into one like as
|
||
returned by <<bfd_openr>>. It does this by writing the
|
||
contents out to the memory buffer, then reversing the
|
||
direction.
|
||
|
||
<<TRUE>> is returned if all is ok, otherwise <<FALSE>>. */
|
||
|
||
bool
|
||
bfd_make_readable (bfd *abfd)
|
||
{
|
||
if (abfd->direction != write_direction || !(abfd->flags & BFD_IN_MEMORY))
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return false;
|
||
}
|
||
|
||
if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)))
|
||
return false;
|
||
|
||
if (! BFD_SEND (abfd, _close_and_cleanup, (abfd)))
|
||
return false;
|
||
|
||
abfd->arch_info = &bfd_default_arch_struct;
|
||
|
||
abfd->where = 0;
|
||
abfd->format = bfd_unknown;
|
||
abfd->my_archive = NULL;
|
||
abfd->origin = 0;
|
||
abfd->opened_once = false;
|
||
abfd->output_has_begun = false;
|
||
abfd->section_count = 0;
|
||
abfd->usrdata = NULL;
|
||
abfd->cacheable = false;
|
||
abfd->flags |= BFD_IN_MEMORY;
|
||
abfd->mtime_set = false;
|
||
|
||
abfd->target_defaulted = true;
|
||
abfd->direction = read_direction;
|
||
abfd->sections = 0;
|
||
abfd->symcount = 0;
|
||
abfd->outsymbols = 0;
|
||
abfd->tdata.any = 0;
|
||
abfd->size = 0;
|
||
|
||
bfd_section_list_clear (abfd);
|
||
bfd_check_format (abfd, bfd_object);
|
||
|
||
return true;
|
||
}
|
||
|
||
/*
|
||
GNU Extension: separate debug-info files
|
||
|
||
The idea here is that a special section called .gnu_debuglink might be
|
||
embedded in a binary file, which indicates that some *other* file
|
||
contains the real debugging information. This special section contains a
|
||
filename and CRC32 checksum, which we read and resolve to another file,
|
||
if it exists.
|
||
|
||
This facilitates "optional" provision of debugging information, without
|
||
having to provide two complete copies of every binary object (with and
|
||
without debug symbols). */
|
||
|
||
#define GNU_DEBUGLINK ".gnu_debuglink"
|
||
#define GNU_DEBUGALTLINK ".gnu_debugaltlink"
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_calc_gnu_debuglink_crc32
|
||
|
||
SYNOPSIS
|
||
uint32_t bfd_calc_gnu_debuglink_crc32
|
||
(uint32_t crc, const bfd_byte *buf, bfd_size_type len);
|
||
|
||
DESCRIPTION
|
||
Computes a CRC value as used in the .gnu_debuglink section.
|
||
Advances the previously computed @var{crc} value by computing
|
||
and adding in the crc32 for @var{len} bytes of @var{buf}.
|
||
|
||
Return the updated CRC32 value.
|
||
*/
|
||
|
||
uint32_t
|
||
bfd_calc_gnu_debuglink_crc32 (uint32_t crc,
|
||
const bfd_byte *buf,
|
||
bfd_size_type len)
|
||
{
|
||
static const uint32_t crc32_table[256] =
|
||
{
|
||
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
|
||
0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
|
||
0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
|
||
0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
|
||
0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
|
||
0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
|
||
0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
|
||
0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
|
||
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
|
||
0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
|
||
0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
|
||
0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
|
||
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
|
||
0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
|
||
0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
|
||
0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
|
||
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
|
||
0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
|
||
0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
|
||
0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
|
||
0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
|
||
0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
|
||
0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
|
||
0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
|
||
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
|
||
0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
|
||
0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
|
||
0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
|
||
0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
|
||
0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
|
||
0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
|
||
0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
|
||
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
|
||
0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
|
||
0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
|
||
0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
|
||
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
|
||
0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
|
||
0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
|
||
0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
|
||
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
|
||
0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
|
||
0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
|
||
0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
|
||
0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
|
||
0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
|
||
0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
|
||
0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
|
||
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
|
||
0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
|
||
0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
|
||
0x2d02ef8d
|
||
};
|
||
const bfd_byte *end;
|
||
|
||
crc = ~crc & 0xffffffff;
|
||
for (end = buf + len; buf < end; ++ buf)
|
||
crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
|
||
return ~crc & 0xffffffff;
|
||
}
|
||
|
||
|
||
/* Extracts the filename and CRC32 value for any separate debug
|
||
information file associated with @var{abfd}.
|
||
|
||
The @var{crc32_out} parameter is an untyped pointer because
|
||
this routine is used as a @code{get_func_type} function, but it
|
||
is expected to be a uint32_t pointer.
|
||
|
||
Returns the filename of the associated debug information file,
|
||
or NULL if there is no such file. If the filename was found
|
||
then the contents of @var{crc32_out} are updated to hold the
|
||
corresponding CRC32 value for the file.
|
||
|
||
The returned filename is allocated with @code{malloc}; freeing
|
||
it is the responsibility of the caller. */
|
||
|
||
static char *
|
||
bfd_get_debug_link_info_1 (bfd *abfd, void *crc32_out)
|
||
{
|
||
asection *sect;
|
||
uint32_t *crc32 = crc32_out;
|
||
bfd_byte *contents;
|
||
unsigned int crc_offset;
|
||
char *name;
|
||
bfd_size_type size;
|
||
|
||
BFD_ASSERT (abfd);
|
||
BFD_ASSERT (crc32_out);
|
||
|
||
sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK);
|
||
|
||
if (sect == NULL || (sect->flags & SEC_HAS_CONTENTS) == 0)
|
||
return NULL;
|
||
|
||
size = bfd_section_size (sect);
|
||
|
||
/* PR 22794: Make sure that the section has a reasonable size. */
|
||
if (size < 8)
|
||
return NULL;
|
||
|
||
if (!bfd_malloc_and_get_section (abfd, sect, &contents))
|
||
return NULL;
|
||
|
||
/* CRC value is stored after the filename, aligned up to 4 bytes. */
|
||
name = (char *) contents;
|
||
/* PR 17597: Avoid reading off the end of the buffer. */
|
||
crc_offset = strnlen (name, size) + 1;
|
||
crc_offset = (crc_offset + 3) & ~3;
|
||
if (crc_offset + 4 > size)
|
||
{
|
||
free (name);
|
||
return NULL;
|
||
}
|
||
|
||
*crc32 = bfd_get_32 (abfd, contents + crc_offset);
|
||
return name;
|
||
}
|
||
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_get_debug_link_info
|
||
|
||
SYNOPSIS
|
||
char *bfd_get_debug_link_info (bfd *abfd, uint32_t *crc32_out);
|
||
|
||
DESCRIPTION
|
||
Extracts the filename and CRC32 value for any separate debug
|
||
information file associated with @var{abfd}.
|
||
|
||
Returns the filename of the associated debug information file,
|
||
or NULL if there is no such file. If the filename was found
|
||
then the contents of @var{crc32_out} are updated to hold the
|
||
corresponding CRC32 value for the file.
|
||
|
||
The returned filename is allocated with @code{malloc}; freeing
|
||
it is the responsibility of the caller.
|
||
*/
|
||
|
||
char *
|
||
bfd_get_debug_link_info (bfd *abfd, uint32_t *crc32_out)
|
||
{
|
||
return bfd_get_debug_link_info_1 (abfd, crc32_out);
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_get_alt_debug_link_info
|
||
|
||
SYNOPSIS
|
||
char *bfd_get_alt_debug_link_info (bfd * abfd,
|
||
bfd_size_type *buildid_len,
|
||
bfd_byte **buildid_out);
|
||
|
||
DESCRIPTION
|
||
Fetch the filename and BuildID value for any alternate debuginfo
|
||
associated with @var{abfd}. Return NULL if no such info found,
|
||
otherwise return filename and update @var{buildid_len} and
|
||
@var{buildid_out}. The returned filename and build_id are
|
||
allocated with @code{malloc}; freeing them is the responsibility
|
||
of the caller.
|
||
*/
|
||
|
||
char *
|
||
bfd_get_alt_debug_link_info (bfd * abfd, bfd_size_type *buildid_len,
|
||
bfd_byte **buildid_out)
|
||
{
|
||
asection *sect;
|
||
bfd_byte *contents;
|
||
unsigned int buildid_offset;
|
||
char *name;
|
||
bfd_size_type size;
|
||
|
||
BFD_ASSERT (abfd);
|
||
BFD_ASSERT (buildid_len);
|
||
BFD_ASSERT (buildid_out);
|
||
|
||
sect = bfd_get_section_by_name (abfd, GNU_DEBUGALTLINK);
|
||
|
||
if (sect == NULL || (sect->flags & SEC_HAS_CONTENTS) == 0)
|
||
return NULL;
|
||
|
||
size = bfd_section_size (sect);
|
||
if (size < 8)
|
||
return NULL;
|
||
|
||
if (!bfd_malloc_and_get_section (abfd, sect, & contents))
|
||
return NULL;
|
||
|
||
/* BuildID value is stored after the filename. */
|
||
name = (char *) contents;
|
||
buildid_offset = strnlen (name, size) + 1;
|
||
if (buildid_offset >= bfd_section_size (sect))
|
||
return NULL;
|
||
|
||
*buildid_len = size - buildid_offset;
|
||
*buildid_out = bfd_malloc (*buildid_len);
|
||
memcpy (*buildid_out, contents + buildid_offset, *buildid_len);
|
||
|
||
return name;
|
||
}
|
||
|
||
/* Checks to see if @var{name} is a file and if its contents match
|
||
@var{crc32}, which is a pointer to a @code{uint32_t}
|
||
containing a CRC32.
|
||
|
||
The @var{crc32_p} parameter is an untyped pointer because this
|
||
routine is used as a @code{check_func_type} function. */
|
||
|
||
static bool
|
||
separate_debug_file_exists (const char *name, void *crc32_p)
|
||
{
|
||
unsigned char buffer[8 * 1024];
|
||
uint32_t file_crc = 0;
|
||
FILE *f;
|
||
bfd_size_type count;
|
||
uint32_t crc;
|
||
|
||
BFD_ASSERT (name);
|
||
BFD_ASSERT (crc32_p);
|
||
|
||
crc = *(uint32_t *) crc32_p;
|
||
|
||
f = _bfd_real_fopen (name, FOPEN_RB);
|
||
if (f == NULL)
|
||
return false;
|
||
|
||
while ((count = fread (buffer, 1, sizeof (buffer), f)) > 0)
|
||
file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count);
|
||
|
||
fclose (f);
|
||
|
||
return crc == file_crc;
|
||
}
|
||
|
||
/* Checks to see if @var{name} is a file. */
|
||
|
||
static bool
|
||
separate_alt_debug_file_exists (const char *name, void *unused ATTRIBUTE_UNUSED)
|
||
{
|
||
FILE *f;
|
||
|
||
BFD_ASSERT (name);
|
||
|
||
f = _bfd_real_fopen (name, FOPEN_RB);
|
||
if (f == NULL)
|
||
return false;
|
||
|
||
fclose (f);
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Searches for a debug information file corresponding to @var{abfd}.
|
||
|
||
The name of the separate debug info file is returned by the
|
||
@var{get} function. This function scans various fixed locations
|
||
in the filesystem, including the file tree rooted at @var{dir}.
|
||
If the @var{include_dirs} parameter is true then the directory
|
||
components of @var{abfd}'s filename will be included in the
|
||
searched locations.
|
||
|
||
@var{data} is passed unmodified to the @var{get} and @var{check}
|
||
functions. It is generally used to implement build-id-like
|
||
matching in the callback functions.
|
||
|
||
Returns the filename of the first file to be found which
|
||
receives a TRUE result from the @var{check} function.
|
||
Returns NULL if no valid file could be found. */
|
||
|
||
typedef char * (*get_func_type) (bfd *, void *);
|
||
typedef bool (*check_func_type) (const char *, void *);
|
||
|
||
static char *
|
||
find_separate_debug_file (bfd *abfd,
|
||
const char *debug_file_directory,
|
||
bool include_dirs,
|
||
get_func_type get_func,
|
||
check_func_type check_func,
|
||
void *func_data)
|
||
{
|
||
char *base;
|
||
char *dir;
|
||
char *debugfile;
|
||
char *canon_dir;
|
||
size_t dirlen;
|
||
size_t canon_dirlen;
|
||
|
||
BFD_ASSERT (abfd);
|
||
if (debug_file_directory == NULL)
|
||
debug_file_directory = ".";
|
||
|
||
/* BFD may have been opened from a stream. */
|
||
if (bfd_get_filename (abfd) == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return NULL;
|
||
}
|
||
|
||
base = get_func (abfd, func_data);
|
||
|
||
if (base == NULL)
|
||
return NULL;
|
||
|
||
if (base[0] == '\0')
|
||
{
|
||
free (base);
|
||
bfd_set_error (bfd_error_no_debug_section);
|
||
return NULL;
|
||
}
|
||
|
||
if (include_dirs)
|
||
{
|
||
const char *fname = bfd_get_filename (abfd);
|
||
for (dirlen = strlen (fname); dirlen > 0; dirlen--)
|
||
if (IS_DIR_SEPARATOR (fname[dirlen - 1]))
|
||
break;
|
||
|
||
dir = (char *) bfd_malloc (dirlen + 1);
|
||
if (dir == NULL)
|
||
{
|
||
free (base);
|
||
return NULL;
|
||
}
|
||
memcpy (dir, fname, dirlen);
|
||
dir[dirlen] = '\0';
|
||
}
|
||
else
|
||
{
|
||
dir = (char *) bfd_malloc (1);
|
||
* dir = 0;
|
||
dirlen = 0;
|
||
}
|
||
|
||
/* Compute the canonical name of the bfd object with all symbolic links
|
||
resolved, for use in the global debugfile directory. */
|
||
canon_dir = lrealpath (bfd_get_filename (abfd));
|
||
for (canon_dirlen = strlen (canon_dir); canon_dirlen > 0; canon_dirlen--)
|
||
if (IS_DIR_SEPARATOR (canon_dir[canon_dirlen - 1]))
|
||
break;
|
||
canon_dir[canon_dirlen] = '\0';
|
||
|
||
#ifndef EXTRA_DEBUG_ROOT1
|
||
#define EXTRA_DEBUG_ROOT1 "/usr/lib/debug"
|
||
#endif
|
||
#ifndef EXTRA_DEBUG_ROOT2
|
||
#define EXTRA_DEBUG_ROOT2 "/usr/lib/debug/usr"
|
||
#endif
|
||
|
||
debugfile = (char *)
|
||
bfd_malloc (strlen (debug_file_directory) + 1
|
||
+ (canon_dirlen > dirlen ? canon_dirlen : dirlen)
|
||
+ strlen (".debug/")
|
||
#ifdef EXTRA_DEBUG_ROOT1
|
||
+ strlen (EXTRA_DEBUG_ROOT1)
|
||
#endif
|
||
#ifdef EXTRA_DEBUG_ROOT2
|
||
+ strlen (EXTRA_DEBUG_ROOT2)
|
||
#endif
|
||
+ strlen (base)
|
||
+ 1);
|
||
if (debugfile == NULL)
|
||
goto found; /* Actually this returns NULL. */
|
||
|
||
/* First try in the same directory as the original file.
|
||
|
||
FIXME: Strictly speaking if we are using the build-id method,
|
||
(ie include_dirs == FALSE) then we should only check absolute
|
||
paths, not relative ones like this one (and the next one).
|
||
The check is left in however as this allows the binutils
|
||
testsuite to exercise this feature without having to install
|
||
a file into the root filesystem. (See binutils/testsuite/
|
||
binutils-all/objdump.exp for the test). */
|
||
sprintf (debugfile, "%s%s", dir, base);
|
||
if (check_func (debugfile, func_data))
|
||
goto found;
|
||
|
||
/* Then try in a subdirectory called .debug. */
|
||
sprintf (debugfile, "%s.debug/%s", dir, base);
|
||
if (check_func (debugfile, func_data))
|
||
goto found;
|
||
|
||
#ifdef EXTRA_DEBUG_ROOT1
|
||
/* Try the first extra debug file root. */
|
||
sprintf (debugfile, "%s%s%s", EXTRA_DEBUG_ROOT1,
|
||
include_dirs ? canon_dir : "/", base);
|
||
if (check_func (debugfile, func_data))
|
||
goto found;
|
||
#endif
|
||
|
||
#ifdef EXTRA_DEBUG_ROOT2
|
||
/* Try the second extra debug file root. */
|
||
sprintf (debugfile, "%s%s%s", EXTRA_DEBUG_ROOT2,
|
||
include_dirs ? canon_dir : "/", base);
|
||
if (check_func (debugfile, func_data))
|
||
goto found;
|
||
#endif
|
||
|
||
/* Then try in the global debugfile directory. */
|
||
strcpy (debugfile, debug_file_directory);
|
||
dirlen = strlen (debug_file_directory) - 1;
|
||
if (include_dirs)
|
||
{
|
||
if (dirlen > 0
|
||
&& debug_file_directory[dirlen] != '/'
|
||
&& canon_dir[0] != '/')
|
||
strcat (debugfile, "/");
|
||
strcat (debugfile, canon_dir);
|
||
}
|
||
else
|
||
{
|
||
if (dirlen > 0 && debug_file_directory[dirlen] != '/')
|
||
strcat (debugfile, "/");
|
||
}
|
||
strcat (debugfile, base);
|
||
|
||
if (check_func (debugfile, func_data))
|
||
goto found;
|
||
|
||
/* Failed to find the file. */
|
||
free (debugfile);
|
||
debugfile = NULL;
|
||
|
||
found:
|
||
free (base);
|
||
free (dir);
|
||
free (canon_dir);
|
||
return debugfile;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_follow_gnu_debuglink
|
||
|
||
SYNOPSIS
|
||
char *bfd_follow_gnu_debuglink (bfd *abfd, const char *dir);
|
||
|
||
DESCRIPTION
|
||
Takes a BFD and searches it for a .gnu_debuglink section. If this
|
||
section is found, it examines the section for the name and checksum
|
||
of a '.debug' file containing auxiliary debugging information. It
|
||
then searches the filesystem for this .debug file in some standard
|
||
locations, including the directory tree rooted at @var{dir}, and if
|
||
found returns the full filename.
|
||
|
||
If @var{dir} is NULL, the search will take place starting at
|
||
the current directory.
|
||
|
||
Returns <<NULL>> on any errors or failure to locate the .debug
|
||
file, otherwise a pointer to a heap-allocated string
|
||
containing the filename. The caller is responsible for
|
||
freeing this string.
|
||
*/
|
||
|
||
char *
|
||
bfd_follow_gnu_debuglink (bfd *abfd, const char *dir)
|
||
{
|
||
uint32_t crc32;
|
||
|
||
return find_separate_debug_file (abfd, dir, true,
|
||
bfd_get_debug_link_info_1,
|
||
separate_debug_file_exists, &crc32);
|
||
}
|
||
|
||
/* Helper for bfd_follow_gnu_debugaltlink. It just returns the name
|
||
of the separate debug file. */
|
||
|
||
static char *
|
||
get_alt_debug_link_info_shim (bfd * abfd, void *unused ATTRIBUTE_UNUSED)
|
||
{
|
||
bfd_size_type len;
|
||
bfd_byte *buildid = NULL;
|
||
char *result = bfd_get_alt_debug_link_info (abfd, &len, &buildid);
|
||
|
||
free (buildid);
|
||
|
||
return result;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_follow_gnu_debugaltlink
|
||
|
||
SYNOPSIS
|
||
char *bfd_follow_gnu_debugaltlink (bfd *abfd, const char *dir);
|
||
|
||
DESCRIPTION
|
||
Takes a BFD and searches it for a .gnu_debugaltlink section. If this
|
||
section is found, it examines the section for the name of a file
|
||
containing auxiliary debugging information. It then searches the
|
||
filesystem for this file in a set of standard locations, including
|
||
the directory tree rooted at @var{dir}, and if found returns the
|
||
full filename.
|
||
|
||
If @var{dir} is NULL, the search will take place starting at
|
||
the current directory.
|
||
|
||
Returns <<NULL>> on any errors or failure to locate the debug
|
||
file, otherwise a pointer to a heap-allocated string
|
||
containing the filename. The caller is responsible for
|
||
freeing this string.
|
||
*/
|
||
|
||
char *
|
||
bfd_follow_gnu_debugaltlink (bfd *abfd, const char *dir)
|
||
{
|
||
return find_separate_debug_file (abfd, dir, true,
|
||
get_alt_debug_link_info_shim,
|
||
separate_alt_debug_file_exists,
|
||
NULL);
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_create_gnu_debuglink_section
|
||
|
||
SYNOPSIS
|
||
struct bfd_section *bfd_create_gnu_debuglink_section
|
||
(bfd *abfd, const char *filename);
|
||
|
||
DESCRIPTION
|
||
Takes a @var{BFD} and adds a .gnu_debuglink section to it. The
|
||
section is sized to be big enough to contain a link to the specified
|
||
@var{filename}.
|
||
|
||
A pointer to the new section is returned if all is ok. Otherwise
|
||
<<NULL>> is returned and bfd_error is set.
|
||
*/
|
||
|
||
asection *
|
||
bfd_create_gnu_debuglink_section (bfd *abfd, const char *filename)
|
||
{
|
||
asection *sect;
|
||
bfd_size_type debuglink_size;
|
||
flagword flags;
|
||
|
||
if (abfd == NULL || filename == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return NULL;
|
||
}
|
||
|
||
/* Strip off any path components in filename. */
|
||
filename = lbasename (filename);
|
||
|
||
sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK);
|
||
if (sect)
|
||
{
|
||
/* Section already exists. */
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return NULL;
|
||
}
|
||
|
||
flags = SEC_HAS_CONTENTS | SEC_READONLY | SEC_DEBUGGING;
|
||
sect = bfd_make_section_with_flags (abfd, GNU_DEBUGLINK, flags);
|
||
if (sect == NULL)
|
||
return NULL;
|
||
|
||
/* Compute the size of the section. Allow for the CRC after the filename,
|
||
and padding so that it will start on a 4-byte boundary. */
|
||
debuglink_size = strlen (filename) + 1;
|
||
debuglink_size += 3;
|
||
debuglink_size &= ~3;
|
||
debuglink_size += 4;
|
||
|
||
if (!bfd_set_section_size (sect, debuglink_size))
|
||
/* XXX Should we delete the section from the bfd ? */
|
||
return NULL;
|
||
|
||
/* PR 21193: Ensure that the section has 4-byte alignment for the CRC.
|
||
Note - despite the name of the function being called, we are
|
||
setting an alignment power, not a byte alignment value. */
|
||
bfd_set_section_alignment (sect, 2);
|
||
|
||
return sect;
|
||
}
|
||
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_fill_in_gnu_debuglink_section
|
||
|
||
SYNOPSIS
|
||
bool bfd_fill_in_gnu_debuglink_section
|
||
(bfd *abfd, struct bfd_section *sect, const char *filename);
|
||
|
||
DESCRIPTION
|
||
Takes a @var{BFD} and containing a .gnu_debuglink section @var{SECT}
|
||
and fills in the contents of the section to contain a link to the
|
||
specified @var{filename}. The filename should be absolute or
|
||
relative to the current directory.
|
||
|
||
<<TRUE>> is returned if all is ok. Otherwise <<FALSE>> is returned
|
||
and bfd_error is set.
|
||
*/
|
||
|
||
bool
|
||
bfd_fill_in_gnu_debuglink_section (bfd *abfd,
|
||
struct bfd_section *sect,
|
||
const char *filename)
|
||
{
|
||
bfd_size_type debuglink_size;
|
||
uint32_t crc32;
|
||
char * contents;
|
||
bfd_size_type crc_offset;
|
||
FILE * handle;
|
||
unsigned char buffer[8 * 1024];
|
||
size_t count;
|
||
size_t filelen;
|
||
|
||
if (abfd == NULL || sect == NULL || filename == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return false;
|
||
}
|
||
|
||
/* Open the linked file so that we can compute a CRC. */
|
||
handle = _bfd_real_fopen (filename, FOPEN_RB);
|
||
if (handle == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_system_call);
|
||
return false;
|
||
}
|
||
|
||
crc32 = 0;
|
||
while ((count = fread (buffer, 1, sizeof buffer, handle)) > 0)
|
||
crc32 = bfd_calc_gnu_debuglink_crc32 (crc32, buffer, count);
|
||
fclose (handle);
|
||
|
||
/* Strip off any path components in filename,
|
||
now that we no longer need them. */
|
||
filename = lbasename (filename);
|
||
|
||
filelen = strlen (filename);
|
||
debuglink_size = filelen + 1;
|
||
debuglink_size += 3;
|
||
debuglink_size &= ~3;
|
||
debuglink_size += 4;
|
||
|
||
contents = (char *) bfd_malloc (debuglink_size);
|
||
if (contents == NULL)
|
||
{
|
||
/* XXX Should we delete the section from the bfd ? */
|
||
return false;
|
||
}
|
||
|
||
crc_offset = debuglink_size - 4;
|
||
memcpy (contents, filename, filelen);
|
||
memset (contents + filelen, 0, crc_offset - filelen);
|
||
|
||
bfd_put_32 (abfd, crc32, contents + crc_offset);
|
||
|
||
if (! bfd_set_section_contents (abfd, sect, contents, 0, debuglink_size))
|
||
{
|
||
/* XXX Should we delete the section from the bfd ? */
|
||
free (contents);
|
||
return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Finds the build-id associated with @var{abfd}. If the build-id is
|
||
extracted from the note section then a build-id structure is built
|
||
for it, using memory allocated to @var{abfd}, and this is then
|
||
attached to the @var{abfd}.
|
||
|
||
Returns a pointer to the build-id structure if a build-id could be
|
||
found. If no build-id is found NULL is returned and error code is
|
||
set. */
|
||
|
||
static struct bfd_build_id *
|
||
get_build_id (bfd *abfd)
|
||
{
|
||
struct bfd_build_id *build_id;
|
||
Elf_Internal_Note inote;
|
||
Elf_External_Note *enote;
|
||
bfd_byte *contents;
|
||
asection *sect;
|
||
bfd_size_type size;
|
||
|
||
BFD_ASSERT (abfd);
|
||
|
||
if (abfd->build_id && abfd->build_id->size > 0)
|
||
/* Save some time by using the already computed build-id. */
|
||
return (struct bfd_build_id *) abfd->build_id;
|
||
|
||
sect = bfd_get_section_by_name (abfd, ".note.gnu.build-id");
|
||
if (sect == NULL
|
||
|| (sect->flags & SEC_HAS_CONTENTS) == 0)
|
||
{
|
||
bfd_set_error (bfd_error_no_debug_section);
|
||
return NULL;
|
||
}
|
||
|
||
size = bfd_section_size (sect);
|
||
/* FIXME: Should we support smaller build-id notes ? */
|
||
if (size < 0x24)
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return NULL;
|
||
}
|
||
|
||
if (!bfd_malloc_and_get_section (abfd, sect, & contents))
|
||
return NULL;
|
||
|
||
/* FIXME: Paranoia - allow for compressed build-id sections.
|
||
Maybe we should complain if this size is different from
|
||
the one obtained above... */
|
||
size = bfd_section_size (sect);
|
||
if (size < sizeof (Elf_External_Note))
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
free (contents);
|
||
return NULL;
|
||
}
|
||
|
||
enote = (Elf_External_Note *) contents;
|
||
inote.type = H_GET_32 (abfd, enote->type);
|
||
inote.namesz = H_GET_32 (abfd, enote->namesz);
|
||
inote.namedata = enote->name;
|
||
inote.descsz = H_GET_32 (abfd, enote->descsz);
|
||
inote.descdata = inote.namedata + BFD_ALIGN (inote.namesz, 4);
|
||
/* FIXME: Should we check for extra notes in this section ? */
|
||
|
||
if (inote.descsz <= 0
|
||
|| inote.type != NT_GNU_BUILD_ID
|
||
|| inote.namesz != 4 /* sizeof "GNU" */
|
||
|| !startswith (inote.namedata, "GNU")
|
||
|| inote.descsz > 0x7ffffffe
|
||
|| size < (12 + BFD_ALIGN (inote.namesz, 4) + inote.descsz))
|
||
{
|
||
free (contents);
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return NULL;
|
||
}
|
||
|
||
build_id = bfd_alloc (abfd, sizeof (struct bfd_build_id) + inote.descsz);
|
||
if (build_id == NULL)
|
||
{
|
||
free (contents);
|
||
return NULL;
|
||
}
|
||
|
||
build_id->size = inote.descsz;
|
||
memcpy (build_id->data, inote.descdata, inote.descsz);
|
||
abfd->build_id = build_id;
|
||
free (contents);
|
||
|
||
return build_id;
|
||
}
|
||
|
||
/* Searches @var{abfd} for a build-id, and then constructs a pathname
|
||
from it. The path is computed as .build-id/NN/NN+NN.debug where
|
||
NNNN+NN is the build-id value as a hexadecimal string.
|
||
|
||
Returns the constructed filename or NULL upon error. It is the
|
||
caller's responsibility to free the memory used to hold the
|
||
filename. If a filename is returned then the @var{build_id_out_p}
|
||
parameter (which points to a @code{struct bfd_build_id} pointer) is
|
||
set to a pointer to the build_id structure. */
|
||
|
||
static char *
|
||
get_build_id_name (bfd *abfd, void *build_id_out_p)
|
||
{
|
||
struct bfd_build_id **build_id_out = build_id_out_p;
|
||
struct bfd_build_id *build_id;
|
||
char *name;
|
||
char *n;
|
||
bfd_size_type s;
|
||
bfd_byte *d;
|
||
|
||
if (abfd == NULL || bfd_get_filename (abfd) == NULL || build_id_out == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return NULL;
|
||
}
|
||
|
||
build_id = get_build_id (abfd);
|
||
if (build_id == NULL)
|
||
return NULL;
|
||
|
||
/* Compute the debug pathname corresponding to the build-id. */
|
||
name = bfd_malloc (strlen (".build-id/") + build_id->size * 2 + 2 + strlen (".debug"));
|
||
if (name == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_no_memory);
|
||
return NULL;
|
||
}
|
||
n = name;
|
||
d = build_id->data;
|
||
s = build_id->size;
|
||
|
||
n += sprintf (n, ".build-id/");
|
||
n += sprintf (n, "%02x", (unsigned) *d++); s--;
|
||
n += sprintf (n, "/");
|
||
while (s--)
|
||
n += sprintf (n, "%02x", (unsigned) *d++);
|
||
n += sprintf (n, ".debug");
|
||
|
||
*build_id_out = build_id;
|
||
return name;
|
||
}
|
||
|
||
/* Checks to see if @var{name} is a readable file and if its build-id
|
||
matches @var{buildid}.
|
||
|
||
Returns TRUE if the file exists, is readable, and contains a
|
||
build-id which matches the build-id pointed at by @var{build_id_p}
|
||
(which is really a @code{struct bfd_build_id **}). */
|
||
|
||
static bool
|
||
check_build_id_file (const char *name, void *buildid_p)
|
||
{
|
||
struct bfd_build_id *orig_build_id;
|
||
struct bfd_build_id *build_id;
|
||
bfd * file;
|
||
bool result;
|
||
|
||
BFD_ASSERT (name);
|
||
BFD_ASSERT (buildid_p);
|
||
|
||
file = bfd_openr (name, NULL);
|
||
if (file == NULL)
|
||
return false;
|
||
|
||
/* If the file is an archive, process all of its elements. */
|
||
if (! bfd_check_format (file, bfd_object))
|
||
{
|
||
bfd_close (file);
|
||
return false;
|
||
}
|
||
|
||
build_id = get_build_id (file);
|
||
if (build_id == NULL)
|
||
{
|
||
bfd_close (file);
|
||
return false;
|
||
}
|
||
|
||
orig_build_id = *(struct bfd_build_id **) buildid_p;
|
||
|
||
result = build_id->size == orig_build_id->size
|
||
&& memcmp (build_id->data, orig_build_id->data, build_id->size) == 0;
|
||
|
||
(void) bfd_close (file);
|
||
|
||
return result;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_follow_build_id_debuglink
|
||
|
||
SYNOPSIS
|
||
char *bfd_follow_build_id_debuglink (bfd *abfd, const char *dir);
|
||
|
||
DESCRIPTION
|
||
Takes @var{abfd} and searches it for a .note.gnu.build-id section.
|
||
If this section is found, it extracts the value of the NT_GNU_BUILD_ID
|
||
note, which should be a hexadecimal value @var{NNNN+NN} (for
|
||
32+ hex digits). It then searches the filesystem for a file named
|
||
@var{.build-id/NN/NN+NN.debug} in a set of standard locations,
|
||
including the directory tree rooted at @var{dir}. The filename
|
||
of the first matching file to be found is returned. A matching
|
||
file should contain a .note.gnu.build-id section with the same
|
||
@var{NNNN+NN} note as @var{abfd}, although this check is currently
|
||
not implemented.
|
||
|
||
If @var{dir} is NULL, the search will take place starting at
|
||
the current directory.
|
||
|
||
Returns <<NULL>> on any errors or failure to locate the debug
|
||
file, otherwise a pointer to a heap-allocated string
|
||
containing the filename. The caller is responsible for
|
||
freeing this string.
|
||
*/
|
||
|
||
char *
|
||
bfd_follow_build_id_debuglink (bfd *abfd, const char *dir)
|
||
{
|
||
struct bfd_build_id *build_id;
|
||
|
||
return find_separate_debug_file (abfd, dir, false,
|
||
get_build_id_name,
|
||
check_build_id_file, &build_id);
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_set_filename
|
||
|
||
SYNOPSIS
|
||
const char *bfd_set_filename (bfd *abfd, const char *filename);
|
||
|
||
DESCRIPTION
|
||
Set the filename of @var{abfd}, copying the FILENAME parameter to
|
||
bfd_alloc'd memory owned by @var{abfd}. Returns a pointer the
|
||
newly allocated name, or NULL if the allocation failed.
|
||
*/
|
||
|
||
const char *
|
||
bfd_set_filename (bfd *abfd, const char *filename)
|
||
{
|
||
size_t len = strlen (filename) + 1;
|
||
char *n = bfd_alloc (abfd, len);
|
||
|
||
if (n == NULL)
|
||
return NULL;
|
||
|
||
if (abfd->filename != NULL)
|
||
{
|
||
/* PR 29389. If we attempt to rename a file that has been closed due
|
||
to caching, then we will not be able to reopen it later on. */
|
||
if (abfd->iostream == NULL && (abfd->flags & BFD_CLOSED_BY_CACHE))
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return NULL;
|
||
}
|
||
|
||
/* Similarly if we attempt to close a renamed file because the
|
||
cache is now full, we will not be able to reopen it later on. */
|
||
if (abfd->iostream != NULL)
|
||
abfd->cacheable = 0;
|
||
}
|
||
|
||
memcpy (n, filename, len);
|
||
abfd->filename = n;
|
||
|
||
return n;
|
||
}
|