2 * Copyright (c) 2006,2008 Joseph Koshy
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
33 ELFTC_VCSID("$Id: elf_next.c 3710 2019-03-12 09:42:35Z jkoshy $");
44 if ((parent = e->e_parent) == NULL) {
45 LIBELF_SET_ERROR(ARGUMENT, 0);
49 assert(parent->e_kind == ELF_K_AR);
50 assert(parent->e_cmd == ELF_C_READ);
51 assert(e->e_rawfile > parent->e_rawfile);
53 next = e->e_rawfile - parent->e_rawfile + (off_t) e->e_rawsize;
54 next = (next + 1) & ~1; /* round up to an even boundary */
57 * Setup the 'e_next' field of the archive descriptor for the
58 * next call to 'elf_begin()'.
60 parent->e_u.e_ar.e_next = (next >= (off_t) parent->e_rawsize) ?
64 * Return an error if the 'e_next' field falls outside the current
67 * This check is performed after updating the parent descriptor's
68 * 'e_next' field so that the next call to elf_begin(3) will terminate
69 * traversal of a too-small archive even if client code forgets to
70 * check the return value from elf_next(3).
72 if (next > (off_t) parent->e_rawsize) {
73 LIBELF_SET_ERROR(ARGUMENT, 0);