1 /*- 2 * Copyright (c) 2006,2008-2009,2011 Joseph Koshy 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <assert.h> 28 #include <libelf.h> 29 #include <stdlib.h> 30 31 #include "_libelf.h" 32 33 #if ELFTC_HAVE_MMAP 34 #include <sys/mman.h> 35 #endif 36 37 ELFTC_VCSID("$Id: elf_end.c 3738 2019-05-05 21:49:06Z jkoshy $"); 38 39 int 40 elf_end(Elf *e) 41 { 42 Elf *sv; 43 Elf_Scn *scn, *tscn; 44 45 if (e == NULL || e->e_activations == 0) 46 return (0); 47 48 if (--e->e_activations > 0) 49 return (e->e_activations); 50 51 assert(e->e_activations == 0); 52 53 while (e && e->e_activations == 0) { 54 switch (e->e_kind) { 55 case ELF_K_AR: 56 /* 57 * If we still have open child descriptors, we 58 * need to defer reclaiming resources till all 59 * the child descriptors for the archive are 60 * closed. 61 */ 62 if (e->e_u.e_ar.e_nchildren > 0) 63 return (0); 64 break; 65 case ELF_K_ELF: 66 /* 67 * Reclaim all section descriptors. 68 */ 69 RB_FOREACH_SAFE(scn, scntree, &e->e_u.e_elf.e_scn, tscn) 70 scn = _libelf_release_scn(scn); 71 break; 72 case ELF_K_NUM: 73 assert(0); 74 default: 75 break; 76 } 77 78 if (e->e_rawfile) { 79 if (e->e_flags & LIBELF_F_RAWFILE_MALLOC) 80 free(e->e_rawfile); 81 #if ELFTC_HAVE_MMAP 82 else if (e->e_flags & LIBELF_F_RAWFILE_MMAP) 83 (void) munmap(e->e_rawfile, (size_t) e->e_rawsize); 84 #endif 85 } 86 87 sv = e; 88 if ((e = e->e_parent) != NULL) 89 e->e_u.e_ar.e_nchildren--; 90 _libelf_release_elf(sv); 91 } 92 93 return (0); 94 } 95