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,v 1.3 2020/05/18 06:46:23 jsg Exp $");
38
39 int
elf_end(Elf * e)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 STAILQ_FOREACH_SAFE(scn, &e->e_u.e_elf.e_scn, s_next,
70 tscn)
71 scn = _libelf_release_scn(scn);
72 break;
73 case ELF_K_NUM:
74 assert(0);
75 default:
76 break;
77 }
78
79 if (e->e_rawfile) {
80 if (e->e_flags & LIBELF_F_RAWFILE_MALLOC)
81 free(e->e_rawfile);
82 #if ELFTC_HAVE_MMAP
83 else if (e->e_flags & LIBELF_F_RAWFILE_MMAP)
84 (void) munmap(e->e_rawfile, (size_t) e->e_rawsize);
85 #endif
86 }
87
88 sv = e;
89 if ((e = e->e_parent) != NULL)
90 e->e_u.e_ar.e_nchildren--;
91 _libelf_release_elf(sv);
92 }
93
94 return (0);
95 }
96