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f0f10541db
representations of ELF types. The ELF(3) API allows applications to request a conversion that is `in-place', i.e., with source and destinations data buffers being the same. However, the file and memory sizes of ELF sections that have additional internal structure, such as those of type `Elf_Note', or `Elf_GNU_Hash_Header', can be determined only known after the type-specific headers that comprise the first few words in these sections are read and translated. Pass in the size of destination buffer to type translation routines in "libelf_convert.m4" and have these routines return an error code if the translated data would not fit inside the destination buffer. Obtained from: elftoolchain MFC after: 1 month
237 lines
6.0 KiB
C
237 lines
6.0 KiB
C
/*-
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* Copyright (c) 2006 Joseph Koshy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <assert.h>
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#include <errno.h>
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#include <libelf.h>
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#include <stdlib.h>
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#include "_libelf.h"
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Elf_Data *
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elf_getdata(Elf_Scn *s, Elf_Data *d)
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{
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Elf *e;
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size_t fsz, msz, count;
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int elfclass, elftype;
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unsigned int sh_type;
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uint64_t sh_align, sh_offset, sh_size;
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int (*xlate)(char *_d, size_t _dsz, char *_s, size_t _c, int _swap);
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if (s == NULL || (e = s->s_elf) == NULL || e->e_kind != ELF_K_ELF ||
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(d != NULL && s != d->d_scn)) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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if (d == NULL && (d = STAILQ_FIRST(&s->s_data)) != NULL)
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return (d);
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if (d != NULL)
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return (STAILQ_NEXT(d, d_next));
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if (e->e_rawfile == NULL) {
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LIBELF_SET_ERROR(SEQUENCE, 0);
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return (NULL);
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}
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elfclass = e->e_class;
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assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64);
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if (elfclass == ELFCLASS32) {
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sh_type = s->s_shdr.s_shdr32.sh_type;
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sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset;
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sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size;
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sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign;
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} else {
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sh_type = s->s_shdr.s_shdr64.sh_type;
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sh_offset = s->s_shdr.s_shdr64.sh_offset;
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sh_size = s->s_shdr.s_shdr64.sh_size;
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sh_align = s->s_shdr.s_shdr64.sh_addralign;
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}
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if (sh_type == SHT_NULL)
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return (NULL);
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if ((elftype = _libelf_xlate_shtype(sh_type)) < ELF_T_FIRST ||
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elftype > ELF_T_LAST || (sh_type != SHT_NOBITS &&
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sh_offset + sh_size > (uint64_t) e->e_rawsize)) {
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LIBELF_SET_ERROR(SECTION, 0);
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return (NULL);
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}
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if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize)
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(elftype, (size_t) 1, e->e_version)) == 0) {
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LIBELF_SET_ERROR(UNIMPL, 0);
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return (NULL);
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}
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if (sh_size % fsz) {
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LIBELF_SET_ERROR(SECTION, 0);
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return (NULL);
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}
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count = sh_size / fsz;
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msz = _libelf_msize(elftype, elfclass, e->e_version);
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assert(msz > 0);
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if ((d = _libelf_allocate_data(s)) == NULL)
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return (NULL);
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d->d_buf = NULL;
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d->d_off = 0;
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d->d_align = sh_align;
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d->d_size = msz * count;
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d->d_type = elftype;
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d->d_version = e->e_version;
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if (sh_type == SHT_NOBITS)
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return (d);
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if ((d->d_buf = malloc(msz*count)) == NULL) {
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(void) _libelf_release_data(d);
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LIBELF_SET_ERROR(RESOURCE, 0);
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return (NULL);
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}
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d->d_flags |= LIBELF_F_MALLOCED;
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xlate = _libelf_get_translator(elftype, ELF_TOMEMORY, elfclass);
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if (!(*xlate)(d->d_buf, d->d_size, e->e_rawfile + sh_offset, count,
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e->e_byteorder != LIBELF_PRIVATE(byteorder))) {
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_libelf_release_data(d);
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LIBELF_SET_ERROR(DATA, 0);
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return (NULL);
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}
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STAILQ_INSERT_TAIL(&s->s_data, d, d_next);
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return (d);
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}
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Elf_Data *
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elf_newdata(Elf_Scn *s)
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{
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Elf *e;
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Elf_Data *d;
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if (s == NULL || (e = s->s_elf) == NULL ||
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e->e_kind != ELF_K_ELF) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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/*
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* elf_newdata() has to append a data descriptor, so
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* bring in existing section data if not already present.
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*/
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if (e->e_rawfile && s->s_size > 0 && STAILQ_EMPTY(&s->s_data))
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if (elf_getdata(s, NULL) == NULL)
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return (NULL);
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if ((d = _libelf_allocate_data(s)) == NULL)
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return (NULL);
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STAILQ_INSERT_TAIL(&s->s_data, d, d_next);
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d->d_align = 1;
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d->d_buf = NULL;
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d->d_off = (uint64_t) ~0;
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d->d_size = 0;
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d->d_type = ELF_T_BYTE;
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d->d_version = LIBELF_PRIVATE(version);
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(void) elf_flagscn(s, ELF_C_SET, ELF_F_DIRTY);
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return (d);
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}
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/*
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* Retrieve a data descriptor for raw (untranslated) data for section
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* `s'.
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*/
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Elf_Data *
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elf_rawdata(Elf_Scn *s, Elf_Data *d)
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{
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Elf *e;
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int elf_class;
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uint32_t sh_type;
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uint64_t sh_align, sh_offset, sh_size;
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if (s == NULL || (e = s->s_elf) == NULL ||
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e->e_kind != ELF_K_ELF || e->e_rawfile == NULL) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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if (d == NULL && (d = STAILQ_FIRST(&s->s_rawdata)) != NULL)
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return (d);
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if (d != NULL)
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return (STAILQ_NEXT(d, d_next));
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elf_class = e->e_class;
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assert(elf_class == ELFCLASS32 || elf_class == ELFCLASS64);
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if (elf_class == ELFCLASS32) {
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sh_type = s->s_shdr.s_shdr32.sh_type;
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sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset;
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sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size;
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sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign;
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} else {
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sh_type = s->s_shdr.s_shdr64.sh_type;
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sh_offset = s->s_shdr.s_shdr64.sh_offset;
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sh_size = s->s_shdr.s_shdr64.sh_size;
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sh_align = s->s_shdr.s_shdr64.sh_addralign;
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}
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if (sh_type == SHT_NULL)
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return (NULL);
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if ((d = _libelf_allocate_data(s)) == NULL)
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return (NULL);
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d->d_buf = sh_type == SHT_NOBITS ? NULL : e->e_rawfile + sh_offset;
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d->d_off = 0;
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d->d_align = sh_align;
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d->d_size = sh_size;
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d->d_type = ELF_T_BYTE;
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d->d_version = e->e_version;
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STAILQ_INSERT_TAIL(&s->s_rawdata, d, d_next);
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return (d);
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}
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