155 lines
4.0 KiB
C
155 lines
4.0 KiB
C
/*-
|
|
* Copyright (c) 2006,2008 Joseph Koshy
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
#include <assert.h>
|
|
#include <gelf.h>
|
|
#include <libelf.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "_libelf.h"
|
|
|
|
ELFTC_VCSID("$Id: libelf_phdr.c 2931 2013-03-23 11:41:07Z jkoshy $");
|
|
|
|
void *
|
|
_libelf_getphdr(Elf *e, int ec)
|
|
{
|
|
size_t phnum;
|
|
size_t fsz, msz;
|
|
uint64_t phoff;
|
|
Elf32_Ehdr *eh32;
|
|
Elf64_Ehdr *eh64;
|
|
void *ehdr, *phdr;
|
|
int (*xlator)(char *_d, size_t _dsz, char *_s, size_t _c, int _swap);
|
|
|
|
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
|
|
|
|
if (e == NULL) {
|
|
LIBELF_SET_ERROR(ARGUMENT, 0);
|
|
return (NULL);
|
|
}
|
|
|
|
if ((phdr = (ec == ELFCLASS32 ?
|
|
(void *) e->e_u.e_elf.e_phdr.e_phdr32 :
|
|
(void *) e->e_u.e_elf.e_phdr.e_phdr64)) != NULL)
|
|
return (phdr);
|
|
|
|
/*
|
|
* Check the PHDR related fields in the EHDR for sanity.
|
|
*/
|
|
|
|
if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
|
|
return (NULL);
|
|
|
|
phnum = e->e_u.e_elf.e_nphdr;
|
|
|
|
if (ec == ELFCLASS32) {
|
|
eh32 = (Elf32_Ehdr *) ehdr;
|
|
phoff = (uint64_t) eh32->e_phoff;
|
|
} else {
|
|
eh64 = (Elf64_Ehdr *) ehdr;
|
|
phoff = (uint64_t) eh64->e_phoff;
|
|
}
|
|
|
|
fsz = gelf_fsize(e, ELF_T_PHDR, phnum, e->e_version);
|
|
|
|
assert(fsz > 0);
|
|
|
|
if ((uint64_t) e->e_rawsize < (phoff + fsz)) {
|
|
LIBELF_SET_ERROR(HEADER, 0);
|
|
return (NULL);
|
|
}
|
|
|
|
msz = _libelf_msize(ELF_T_PHDR, ec, EV_CURRENT);
|
|
|
|
assert(msz > 0);
|
|
|
|
if ((phdr = calloc(phnum, msz)) == NULL) {
|
|
LIBELF_SET_ERROR(RESOURCE, 0);
|
|
return (NULL);
|
|
}
|
|
|
|
if (ec == ELFCLASS32)
|
|
e->e_u.e_elf.e_phdr.e_phdr32 = phdr;
|
|
else
|
|
e->e_u.e_elf.e_phdr.e_phdr64 = phdr;
|
|
|
|
|
|
xlator = _libelf_get_translator(ELF_T_PHDR, ELF_TOMEMORY, ec);
|
|
(*xlator)(phdr, phnum * msz, e->e_rawfile + phoff, phnum,
|
|
e->e_byteorder != LIBELF_PRIVATE(byteorder));
|
|
|
|
return (phdr);
|
|
}
|
|
|
|
void *
|
|
_libelf_newphdr(Elf *e, int ec, size_t count)
|
|
{
|
|
void *ehdr, *newphdr, *oldphdr;
|
|
size_t msz;
|
|
|
|
if (e == NULL) {
|
|
LIBELF_SET_ERROR(ARGUMENT, 0);
|
|
return (NULL);
|
|
}
|
|
|
|
if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL) {
|
|
LIBELF_SET_ERROR(SEQUENCE, 0);
|
|
return (NULL);
|
|
}
|
|
|
|
assert(e->e_class == ec);
|
|
assert(ec == ELFCLASS32 || ec == ELFCLASS64);
|
|
assert(e->e_version == EV_CURRENT);
|
|
|
|
msz = _libelf_msize(ELF_T_PHDR, ec, e->e_version);
|
|
|
|
assert(msz > 0);
|
|
|
|
newphdr = NULL;
|
|
if (count > 0 && (newphdr = calloc(count, msz)) == NULL) {
|
|
LIBELF_SET_ERROR(RESOURCE, 0);
|
|
return (NULL);
|
|
}
|
|
|
|
if (ec == ELFCLASS32) {
|
|
if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr32) != NULL)
|
|
free(oldphdr);
|
|
e->e_u.e_elf.e_phdr.e_phdr32 = (Elf32_Phdr *) newphdr;
|
|
} else {
|
|
if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr64) != NULL)
|
|
free(oldphdr);
|
|
e->e_u.e_elf.e_phdr.e_phdr64 = (Elf64_Phdr *) newphdr;
|
|
}
|
|
|
|
e->e_u.e_elf.e_nphdr = count;
|
|
|
|
elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);
|
|
|
|
return (newphdr);
|
|
}
|