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
27 #include <sys/cdefs.h>
36 ELFTC_VCSID("$Id: libelf_phdr.c 3009 2014-03-23 01:49:59Z jkoshy $");
39 _libelf_getphdr(Elf *e, int ec)
47 int (*xlator)(unsigned char *_d, size_t _dsz, unsigned char *_s,
48 size_t _c, int _swap);
50 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
53 LIBELF_SET_ERROR(ARGUMENT, 0);
57 if ((phdr = (ec == ELFCLASS32 ?
58 (void *) e->e_u.e_elf.e_phdr.e_phdr32 :
59 (void *) e->e_u.e_elf.e_phdr.e_phdr64)) != NULL)
63 * Check the PHDR related fields in the EHDR for sanity.
66 if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
69 phnum = e->e_u.e_elf.e_nphdr;
71 if (ec == ELFCLASS32) {
72 eh32 = (Elf32_Ehdr *) ehdr;
73 phoff = (uint64_t) eh32->e_phoff;
75 eh64 = (Elf64_Ehdr *) ehdr;
76 phoff = (uint64_t) eh64->e_phoff;
79 fsz = gelf_fsize(e, ELF_T_PHDR, phnum, e->e_version);
83 if ((uint64_t) e->e_rawsize < (phoff + fsz)) {
84 LIBELF_SET_ERROR(HEADER, 0);
88 msz = _libelf_msize(ELF_T_PHDR, ec, EV_CURRENT);
92 if ((phdr = calloc(phnum, msz)) == NULL) {
93 LIBELF_SET_ERROR(RESOURCE, 0);
98 e->e_u.e_elf.e_phdr.e_phdr32 = phdr;
100 e->e_u.e_elf.e_phdr.e_phdr64 = phdr;
103 xlator = _libelf_get_translator(ELF_T_PHDR, ELF_TOMEMORY, ec);
104 (*xlator)(phdr, phnum * msz, e->e_rawfile + phoff, phnum,
105 e->e_byteorder != LIBELF_PRIVATE(byteorder));
111 _libelf_newphdr(Elf *e, int ec, size_t count)
113 void *ehdr, *newphdr, *oldphdr;
117 LIBELF_SET_ERROR(ARGUMENT, 0);
121 if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL) {
122 LIBELF_SET_ERROR(SEQUENCE, 0);
126 assert(e->e_class == ec);
127 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
128 assert(e->e_version == EV_CURRENT);
130 msz = _libelf_msize(ELF_T_PHDR, ec, e->e_version);
135 if (count > 0 && (newphdr = calloc(count, msz)) == NULL) {
136 LIBELF_SET_ERROR(RESOURCE, 0);
140 if (ec == ELFCLASS32) {
141 if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr32) != NULL)
143 e->e_u.e_elf.e_phdr.e_phdr32 = (Elf32_Phdr *) newphdr;
145 if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr64) != NULL)
147 e->e_u.e_elf.e_phdr.e_phdr64 = (Elf64_Phdr *) newphdr;
150 e->e_u.e_elf.e_nphdr = count;
152 elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);