IABSD.fr/src/lib/libelf/elf_end.c

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• Author : jsg
  Date : 2020-05-18 06:46:23
  Hash : 63b93652
  Message : update libelf from elftoolchain r3717 to r3833 ok deraadt@

• lib/libelf/elf_end.c

• /*-
   * Copyright (c) 2006,2008-2009,2011 Joseph Koshy
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <assert.h>
  #include <libelf.h>
  #include <stdlib.h>
  
  #include "_libelf.h"
  
  #if	ELFTC_HAVE_MMAP
  #include <sys/mman.h>
  #endif
  
  ELFTC_VCSID("$Id: elf_end.c,v 1.3 2020/05/18 06:46:23 jsg Exp $");
  
  int
  elf_end(Elf *e)
  {
  	Elf *sv;
  	Elf_Scn *scn, *tscn;
  
  	if (e == NULL || e->e_activations == 0)
  		return (0);
  
  	if (--e->e_activations > 0)
  		return (e->e_activations);
  
  	assert(e->e_activations == 0);
  
  	while (e && e->e_activations == 0) {
  		switch (e->e_kind) {
  		case ELF_K_AR:
  			/*
  			 * If we still have open child descriptors, we
  			 * need to defer reclaiming resources till all
  			 * the child descriptors for the archive are
  			 * closed.
  			 */
  			if (e->e_u.e_ar.e_nchildren > 0)
  				return (0);
  			break;
  		case ELF_K_ELF:
  			/*
  			 * Reclaim all section descriptors.
  			 */
  			STAILQ_FOREACH_SAFE(scn, &e->e_u.e_elf.e_scn, s_next,
  			    tscn)
   				scn = _libelf_release_scn(scn);
  			break;
  		case ELF_K_NUM:
  			assert(0);
  		default:
  			break;
  		}
  
  		if (e->e_rawfile) {
  			if (e->e_flags & LIBELF_F_RAWFILE_MALLOC)
  				free(e->e_rawfile);
  #if	ELFTC_HAVE_MMAP
  			else if (e->e_flags & LIBELF_F_RAWFILE_MMAP)
  				(void) munmap(e->e_rawfile, (size_t) e->e_rawsize);
  #endif
  		}
  
  		sv = e;
  		if ((e = e->e_parent) != NULL)
  			e->e_u.e_ar.e_nchildren--;
  		_libelf_release_elf(sv);
  	}
  
  	return (0);
  }