IABSD.fr/src/lib/libelf/gelf_rela.c

Branch : - branch - master - tag -

• Show log

  Commit

• Author : jsg
  Date : 2020-05-18 06:46:23
  Hash : 63b93652
  Message : update libelf from elftoolchain r3717 to r3833 ok deraadt@

• lib/libelf/gelf_rela.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 <assert.h>
  #include <gelf.h>
  #include <limits.h>
  #include <stdint.h>
  
  #include "_libelf.h"
  
  ELFTC_VCSID("$Id: gelf_rela.c,v 1.2 2020/05/18 06:46:23 jsg Exp $");
  
  GElf_Rela *
  gelf_getrela(Elf_Data *ed, int ndx, GElf_Rela *dst)
  {
  	int ec;
  	Elf *e;
  	size_t msz;
  	Elf_Scn *scn;
  	uint32_t sh_type;
  	Elf32_Rela *rela32;
  	Elf64_Rela *rela64;
  	struct _Libelf_Data *d;
  
  	d = (struct _Libelf_Data *) ed;
  
  	if (d == NULL || ndx < 0 || dst == NULL ||
  	    (scn = d->d_scn) == NULL ||
  	    (e = scn->s_elf) == NULL) {
  		LIBELF_SET_ERROR(ARGUMENT, 0);
  		return (NULL);
  	}
  
  	ec = e->e_class;
  	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
  
  	if (ec == ELFCLASS32)
  		sh_type = scn->s_shdr.s_shdr32.sh_type;
  	else
  		sh_type = scn->s_shdr.s_shdr64.sh_type;
  
  	if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) {
  		LIBELF_SET_ERROR(ARGUMENT, 0);
  		return (NULL);
  	}
  
  	if ((msz = _libelf_msize(ELF_T_RELA, ec, e->e_version)) == 0)
  		return (NULL);
  
  	assert(ndx >= 0);
  
  	if (msz * (size_t) ndx >= d->d_data.d_size) {
  		LIBELF_SET_ERROR(ARGUMENT, 0);
  		return (NULL);
  	}
  
  	if (ec == ELFCLASS32) {
  		rela32 = (Elf32_Rela *) d->d_data.d_buf + ndx;
  
  		dst->r_offset = (Elf64_Addr) rela32->r_offset;
  		dst->r_info   = ELF64_R_INFO(
  		    (Elf64_Xword) ELF32_R_SYM(rela32->r_info),
  		    ELF32_R_TYPE(rela32->r_info));
  		dst->r_addend = (Elf64_Sxword) rela32->r_addend;
  
  	} else {
  
  		rela64 = (Elf64_Rela *) d->d_data.d_buf + ndx;
  
  		*dst = *rela64;
  	}
  
  	return (dst);
  }
  
  int
  gelf_update_rela(Elf_Data *ed, int ndx, GElf_Rela *dr)
  {
  	int ec;
  	Elf *e;
  	size_t msz;
  	Elf_Scn *scn;
  	uint32_t sh_type;
  	Elf32_Rela *rela32;
  	Elf64_Rela *rela64;
  	struct _Libelf_Data *d;
  
  	d = (struct _Libelf_Data *) ed;
  
  	if (d == NULL || ndx < 0 || dr == NULL ||
  	    (scn = d->d_scn) == NULL ||
  	    (e = scn->s_elf) == NULL) {
  		LIBELF_SET_ERROR(ARGUMENT, 0);
  		return (0);
  	}
  
  	ec = e->e_class;
  	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
  
  	if (ec == ELFCLASS32)
  		sh_type = scn->s_shdr.s_shdr32.sh_type;
  	else
  		sh_type = scn->s_shdr.s_shdr64.sh_type;
  
  	if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) {
  		LIBELF_SET_ERROR(ARGUMENT, 0);
  		return (0);
  	}
  
  	if ((msz = _libelf_msize(ELF_T_RELA, ec, e->e_version)) == 0)
  		return (0);
  
  	assert(ndx >= 0);
  
  	if (msz * (size_t) ndx >= d->d_data.d_size) {
  		LIBELF_SET_ERROR(ARGUMENT, 0);
  		return (0);
  	}
  
  	if (ec == ELFCLASS32) {
  		rela32 = (Elf32_Rela *) d->d_data.d_buf + ndx;
  
  		LIBELF_COPY_U32(rela32, dr, r_offset);
  
  		if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0U) ||
  		    ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) {
  			LIBELF_SET_ERROR(RANGE, 0);
  			return (0);
  		}
  		rela32->r_info = ELF32_R_INFO(
  			(Elf32_Word) ELF64_R_SYM(dr->r_info),
  			(Elf32_Word) ELF64_R_TYPE(dr->r_info));
  
  		LIBELF_COPY_S32(rela32, dr, r_addend);
  	} else {
  		rela64 = (Elf64_Rela *) d->d_data.d_buf + ndx;
  
  		*rela64 = *dr;
  	}
  
  	return (1);
  }