1*f8fb3368SJohn Marino /*-
2*f8fb3368SJohn Marino * Copyright (c) 2006,2008 Joseph Koshy
3*f8fb3368SJohn Marino * All rights reserved.
4*f8fb3368SJohn Marino *
5*f8fb3368SJohn Marino * Redistribution and use in source and binary forms, with or without
6*f8fb3368SJohn Marino * modification, are permitted provided that the following conditions
7*f8fb3368SJohn Marino * are met:
8*f8fb3368SJohn Marino * 1. Redistributions of source code must retain the above copyright
9*f8fb3368SJohn Marino * notice, this list of conditions and the following disclaimer.
10*f8fb3368SJohn Marino * 2. Redistributions in binary form must reproduce the above copyright
11*f8fb3368SJohn Marino * notice, this list of conditions and the following disclaimer in the
12*f8fb3368SJohn Marino * documentation and/or other materials provided with the distribution.
13*f8fb3368SJohn Marino *
14*f8fb3368SJohn Marino * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15*f8fb3368SJohn Marino * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16*f8fb3368SJohn Marino * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17*f8fb3368SJohn Marino * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18*f8fb3368SJohn Marino * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19*f8fb3368SJohn Marino * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20*f8fb3368SJohn Marino * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21*f8fb3368SJohn Marino * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22*f8fb3368SJohn Marino * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23*f8fb3368SJohn Marino * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24*f8fb3368SJohn Marino * SUCH DAMAGE.
25*f8fb3368SJohn Marino */
26*f8fb3368SJohn Marino
27*f8fb3368SJohn Marino #include <assert.h>
28*f8fb3368SJohn Marino #include <gelf.h>
29*f8fb3368SJohn Marino #include <libelf.h>
30*f8fb3368SJohn Marino #include <stdlib.h>
31*f8fb3368SJohn Marino
32*f8fb3368SJohn Marino #include "_libelf.h"
33*f8fb3368SJohn Marino
34*f8fb3368SJohn Marino ELFTC_VCSID("$Id: libelf_phdr.c 3174 2015-03-27 17:13:41Z emaste $");
35*f8fb3368SJohn Marino
36*f8fb3368SJohn Marino void *
_libelf_getphdr(Elf * e,int ec)37*f8fb3368SJohn Marino _libelf_getphdr(Elf *e, int ec)
38*f8fb3368SJohn Marino {
39*f8fb3368SJohn Marino size_t phnum;
40*f8fb3368SJohn Marino size_t fsz, msz;
41*f8fb3368SJohn Marino uint64_t phoff;
42*f8fb3368SJohn Marino Elf32_Ehdr *eh32;
43*f8fb3368SJohn Marino Elf64_Ehdr *eh64;
44*f8fb3368SJohn Marino void *ehdr, *phdr;
45*f8fb3368SJohn Marino int (*xlator)(unsigned char *_d, size_t _dsz, unsigned char *_s,
46*f8fb3368SJohn Marino size_t _c, int _swap);
47*f8fb3368SJohn Marino
48*f8fb3368SJohn Marino assert(ec == ELFCLASS32 || ec == ELFCLASS64);
49*f8fb3368SJohn Marino
50*f8fb3368SJohn Marino if (e == NULL) {
51*f8fb3368SJohn Marino LIBELF_SET_ERROR(ARGUMENT, 0);
52*f8fb3368SJohn Marino return (NULL);
53*f8fb3368SJohn Marino }
54*f8fb3368SJohn Marino
55*f8fb3368SJohn Marino if ((phdr = (ec == ELFCLASS32 ?
56*f8fb3368SJohn Marino (void *) e->e_u.e_elf.e_phdr.e_phdr32 :
57*f8fb3368SJohn Marino (void *) e->e_u.e_elf.e_phdr.e_phdr64)) != NULL)
58*f8fb3368SJohn Marino return (phdr);
59*f8fb3368SJohn Marino
60*f8fb3368SJohn Marino /*
61*f8fb3368SJohn Marino * Check the PHDR related fields in the EHDR for sanity.
62*f8fb3368SJohn Marino */
63*f8fb3368SJohn Marino
64*f8fb3368SJohn Marino if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
65*f8fb3368SJohn Marino return (NULL);
66*f8fb3368SJohn Marino
67*f8fb3368SJohn Marino phnum = e->e_u.e_elf.e_nphdr;
68*f8fb3368SJohn Marino
69*f8fb3368SJohn Marino if (ec == ELFCLASS32) {
70*f8fb3368SJohn Marino eh32 = (Elf32_Ehdr *) ehdr;
71*f8fb3368SJohn Marino phoff = (uint64_t) eh32->e_phoff;
72*f8fb3368SJohn Marino } else {
73*f8fb3368SJohn Marino eh64 = (Elf64_Ehdr *) ehdr;
74*f8fb3368SJohn Marino phoff = (uint64_t) eh64->e_phoff;
75*f8fb3368SJohn Marino }
76*f8fb3368SJohn Marino
77*f8fb3368SJohn Marino fsz = gelf_fsize(e, ELF_T_PHDR, phnum, e->e_version);
78*f8fb3368SJohn Marino
79*f8fb3368SJohn Marino assert(fsz > 0);
80*f8fb3368SJohn Marino
81*f8fb3368SJohn Marino if ((uint64_t) e->e_rawsize < (phoff + fsz)) {
82*f8fb3368SJohn Marino LIBELF_SET_ERROR(HEADER, 0);
83*f8fb3368SJohn Marino return (NULL);
84*f8fb3368SJohn Marino }
85*f8fb3368SJohn Marino
86*f8fb3368SJohn Marino msz = _libelf_msize(ELF_T_PHDR, ec, EV_CURRENT);
87*f8fb3368SJohn Marino
88*f8fb3368SJohn Marino assert(msz > 0);
89*f8fb3368SJohn Marino
90*f8fb3368SJohn Marino if ((phdr = calloc(phnum, msz)) == NULL) {
91*f8fb3368SJohn Marino LIBELF_SET_ERROR(RESOURCE, 0);
92*f8fb3368SJohn Marino return (NULL);
93*f8fb3368SJohn Marino }
94*f8fb3368SJohn Marino
95*f8fb3368SJohn Marino if (ec == ELFCLASS32)
96*f8fb3368SJohn Marino e->e_u.e_elf.e_phdr.e_phdr32 = phdr;
97*f8fb3368SJohn Marino else
98*f8fb3368SJohn Marino e->e_u.e_elf.e_phdr.e_phdr64 = phdr;
99*f8fb3368SJohn Marino
100*f8fb3368SJohn Marino
101*f8fb3368SJohn Marino xlator = _libelf_get_translator(ELF_T_PHDR, ELF_TOMEMORY, ec);
102*f8fb3368SJohn Marino (*xlator)(phdr, phnum * msz, e->e_rawfile + phoff, phnum,
103*f8fb3368SJohn Marino e->e_byteorder != LIBELF_PRIVATE(byteorder));
104*f8fb3368SJohn Marino
105*f8fb3368SJohn Marino return (phdr);
106*f8fb3368SJohn Marino }
107*f8fb3368SJohn Marino
108*f8fb3368SJohn Marino void *
_libelf_newphdr(Elf * e,int ec,size_t count)109*f8fb3368SJohn Marino _libelf_newphdr(Elf *e, int ec, size_t count)
110*f8fb3368SJohn Marino {
111*f8fb3368SJohn Marino void *ehdr, *newphdr, *oldphdr;
112*f8fb3368SJohn Marino size_t msz;
113*f8fb3368SJohn Marino
114*f8fb3368SJohn Marino if (e == NULL) {
115*f8fb3368SJohn Marino LIBELF_SET_ERROR(ARGUMENT, 0);
116*f8fb3368SJohn Marino return (NULL);
117*f8fb3368SJohn Marino }
118*f8fb3368SJohn Marino
119*f8fb3368SJohn Marino if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL) {
120*f8fb3368SJohn Marino LIBELF_SET_ERROR(SEQUENCE, 0);
121*f8fb3368SJohn Marino return (NULL);
122*f8fb3368SJohn Marino }
123*f8fb3368SJohn Marino
124*f8fb3368SJohn Marino assert(e->e_class == ec);
125*f8fb3368SJohn Marino assert(ec == ELFCLASS32 || ec == ELFCLASS64);
126*f8fb3368SJohn Marino assert(e->e_version == EV_CURRENT);
127*f8fb3368SJohn Marino
128*f8fb3368SJohn Marino msz = _libelf_msize(ELF_T_PHDR, ec, e->e_version);
129*f8fb3368SJohn Marino
130*f8fb3368SJohn Marino assert(msz > 0);
131*f8fb3368SJohn Marino
132*f8fb3368SJohn Marino newphdr = NULL;
133*f8fb3368SJohn Marino if (count > 0 && (newphdr = calloc(count, msz)) == NULL) {
134*f8fb3368SJohn Marino LIBELF_SET_ERROR(RESOURCE, 0);
135*f8fb3368SJohn Marino return (NULL);
136*f8fb3368SJohn Marino }
137*f8fb3368SJohn Marino
138*f8fb3368SJohn Marino if (ec == ELFCLASS32) {
139*f8fb3368SJohn Marino if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr32) != NULL)
140*f8fb3368SJohn Marino free(oldphdr);
141*f8fb3368SJohn Marino e->e_u.e_elf.e_phdr.e_phdr32 = (Elf32_Phdr *) newphdr;
142*f8fb3368SJohn Marino } else {
143*f8fb3368SJohn Marino if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr64) != NULL)
144*f8fb3368SJohn Marino free(oldphdr);
145*f8fb3368SJohn Marino e->e_u.e_elf.e_phdr.e_phdr64 = (Elf64_Phdr *) newphdr;
146*f8fb3368SJohn Marino }
147*f8fb3368SJohn Marino
148*f8fb3368SJohn Marino e->e_u.e_elf.e_nphdr = count;
149*f8fb3368SJohn Marino
150*f8fb3368SJohn Marino elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);
151*f8fb3368SJohn Marino
152*f8fb3368SJohn Marino return (newphdr);
153*f8fb3368SJohn Marino }
154