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      1 /*	$NetBSD: gelf_symshndx.c,v 1.7 2026/05/17 21:40:50 jkoshy Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2006,2008,2020 Joseph Koshy
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #if HAVE_NBTOOL_CONFIG_H
     30 # include "nbtool_config.h"
     31 #endif
     32 
     33 #include <sys/cdefs.h>
     34 
     35 #include <assert.h>
     36 #include <gelf.h>
     37 
     38 #include "_libelf.h"
     39 
     40 ELFTC_VCSID("Id: gelf_symshndx.c 4074 2025-01-07 15:34:21Z jkoshy");
     41 
     42 __RCSID("$NetBSD: gelf_symshndx.c,v 1.7 2026/05/17 21:40:50 jkoshy Exp $");
     43 
     44 GElf_Sym *
     45 gelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst,
     46     Elf32_Word *shindex)
     47 {
     48 	Elf *e;
     49 	size_t msz;
     50 	Elf_Scn *scn;
     51 	unsigned int ec;
     52 	uint32_t sh_type;
     53 	struct _Libelf_Data *ld, *lid;
     54 
     55 	ld = (struct _Libelf_Data *) d;
     56 	lid = (struct _Libelf_Data *) id;
     57 
     58 	if (gelf_getsym(d, ndx, dst) == 0)
     59 		return (NULL);
     60 
     61 	if (shindex == NULL)
     62 		return (dst);
     63 
     64 	if (lid == NULL) {
     65 		*shindex = 0;
     66 		return (dst);
     67 	}
     68 
     69 	if ((scn = lid->d_scn) == NULL ||
     70 	    (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf)) {
     71 		LIBELF_SET_ERROR(ARGUMENT, 0);
     72 		return (NULL);
     73 	}
     74 
     75 	ec = e->e_class;
     76 	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
     77 
     78 	if (ec == ELFCLASS32)
     79 		sh_type = scn->s_shdr.s_shdr32.sh_type;
     80 	else
     81 		sh_type = scn->s_shdr.s_shdr64.sh_type;
     82 
     83 	if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
     84 	   id->d_type != ELF_T_WORD) {
     85 		LIBELF_SET_ERROR(ARGUMENT, 0);
     86 		return (NULL);
     87 	}
     88 
     89 	if ((msz = _libelf_msize(ELF_T_WORD, ec, e->e_version)) == 0)
     90 		return (NULL);
     91 
     92 	assert(ndx >= 0);
     93 
     94 	if (msz * (size_t) ndx >= id->d_size) {
     95 		LIBELF_SET_ERROR(ARGUMENT, 0);
     96 		return (NULL);
     97 	}
     98 
     99 	*shindex = ((Elf32_Word *) id->d_buf)[ndx];
    100 
    101 	return (dst);
    102 }
    103 
    104 int
    105 gelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs,
    106     Elf32_Word xindex)
    107 {
    108 	Elf *e;
    109 	size_t msz;
    110 	Elf_Scn *scn;
    111 	unsigned int ec;
    112 	uint32_t sh_type;
    113 	struct _Libelf_Data *ld, *lid;
    114 
    115 	ld = (struct _Libelf_Data *) d;
    116 	lid = (struct _Libelf_Data *) id;
    117 
    118 	if (gelf_update_sym(d, ndx, gs) == 0)
    119 		return (0);
    120 
    121 	if (lid == NULL || (scn = lid->d_scn) == NULL ||
    122 	    (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf)) {
    123 		LIBELF_SET_ERROR(ARGUMENT, 0);
    124 		return (0);
    125 	}
    126 
    127 	ec = e->e_class;
    128 	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
    129 
    130 	if (ec == ELFCLASS32)
    131 		sh_type = scn->s_shdr.s_shdr32.sh_type;
    132 	else
    133 		sh_type = scn->s_shdr.s_shdr64.sh_type;
    134 
    135 	if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
    136 	    d->d_type != ELF_T_WORD) {
    137 		LIBELF_SET_ERROR(ARGUMENT, 0);
    138 		return (0);
    139 	}
    140 
    141 	if ((msz = _libelf_msize(ELF_T_WORD, ec, e->e_version)) == 0)
    142 		return (0);
    143 
    144 	assert(ndx >= 0);
    145 
    146 	if (msz * (size_t) ndx >= id->d_size) {
    147 		LIBELF_SET_ERROR(ARGUMENT, 0);
    148 		return (0);
    149 	}
    150 
    151 	*(((Elf32_Word *) id->d_buf) + ndx) = xindex;
    152 
    153 	return (1);
    154 }
    155