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/* $OpenBSD: elf_hide.c,v 1.10 2015/08/20 22:39:29 deraadt Exp $ */ |
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/* |
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* Copyright (c) 1997 Dale Rahn. |
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* All rights reserved. |
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* |
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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 ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include <sys/types.h> |
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#include <sys/mman.h> |
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#include <sys/stat.h> |
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#include <sys/exec_elf.h> |
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#include <err.h> |
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#include <errno.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "mangle.h" |
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extern int elf_mangle; |
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void load_strtab(Elf_Ehdr * pehdr, char *pexe); |
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void dump_strtab(void); |
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char *get_str(int indx); |
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void load_symtab(Elf_Ehdr * pehdr, char *pexe); |
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void dump_symtab(Elf_Shdr * symsect, Elf_Sym * symtab, int symtabsize); |
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void fprint_str(FILE * channel, int indx); |
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void load_shstr_tab(Elf_Ehdr * pehdr, char *pexe); |
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char *get_shstr(int indx); |
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void fprint_shstr(FILE * channel, int indx); |
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void hide_sym(Elf_Ehdr * ehdr, Elf_Shdr * symsect, |
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Elf_Sym * symtab, int symtabsize, int symtabsecnum); |
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void reorder_syms(Elf_Ehdr * ehdr, Elf_Shdr * symsect, |
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Elf_Sym * symtab, int symtabsize, int symtabsecnum); |
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typedef long Symmap; |
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void renum_reloc_syms(Elf_Ehdr * ehdr, Symmap * symmap, |
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int symtabsecnum); |
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void elf_hide(int pfile, char *p); |
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char *pexe; |
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void |
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elf_hide(int pfile, char *p) |
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{ |
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Elf_Ehdr *pehdr; |
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#ifdef DEBUG |
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Elf_Shdr *pshdr; |
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Elf_Phdr *pphdr; |
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int i; |
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#endif |
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pexe = p; |
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pehdr = (Elf_Ehdr *) pexe; |
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#ifdef DEBUG |
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printf("elf header\n"); |
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printf("e_type %x\n", pehdr->e_type); |
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printf("e_machine %x\n", pehdr->e_machine); |
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printf("e_version %x\n", pehdr->e_version); |
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printf("e_entry %x\n", pehdr->e_entry); |
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printf("e_phoff %x\n", pehdr->e_phoff); |
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printf("e_shoff %x\n", pehdr->e_shoff); |
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printf("e_flags %x\n", pehdr->e_flags); |
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printf("e_ehsize %x\n", pehdr->e_ehsize); |
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printf("e_phentsize %x\n", pehdr->e_phentsize); |
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printf("e_phnum %x\n", pehdr->e_phnum); |
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printf("e_shentsize %x\n", pehdr->e_shentsize); |
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printf("e_shnum %x\n", pehdr->e_shnum); |
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printf("e_shstrndx %x\n", pehdr->e_shstrndx); |
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#endif |
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load_shstr_tab(pehdr, pexe); |
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#ifdef DEBUG |
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for (i = 0; i < pehdr->e_shnum; i++) { |
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pshdr = (Elf_Phdr *) (pexe + pehdr->e_shoff + |
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(i * pehdr->e_shentsize)); |
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printf("section header %d\n", i); |
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printf("sh_name %x ", pshdr->sh_name); |
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fprint_shstr(stdout, pshdr->sh_name); |
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printf("\n"); |
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printf("sh_type %x\n", pshdr->sh_type); |
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printf("sh_flags %x\n", pshdr->sh_flags); |
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printf("sh_addr %x\n", pshdr->sh_addr); |
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printf("sh_offset %x\n", pshdr->sh_offset); |
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printf("sh_size %x\n", pshdr->sh_size); |
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printf("sh_link %x\n", pshdr->sh_link); |
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printf("sh_info %x\n", pshdr->sh_info); |
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printf("sh_addralign %x\n", pshdr->sh_addralign); |
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printf("sh_entsize %x\n", pshdr->sh_entsize); |
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} |
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#endif /* DEBUG */ |
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#ifdef DEBUG |
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for (i = 0; i < pehdr->e_phnum; i++) { |
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pshdr = (Elf_Phdr *) (pexe + pehdr->e_phoff + |
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(i * pehdr->e_phentsize)); |
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printf("program header %d\n", i); |
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printf("p_type %x\n", pphdr->p_type); |
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printf("p_offset %x\n", pphdr->p_offset); |
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printf("p_vaddr %x\n", pphdr->p_vaddr); |
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printf("p_paddr %x\n", pphdr->p_paddr); |
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printf("p_filesz %x\n", pphdr->p_filesz); |
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printf("p_memsz %x\n", pphdr->p_memsz); |
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printf("p_flags %x\n", pphdr->p_flags); |
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printf("p_align %x\n", pphdr->p_align); |
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} |
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#endif /* DEBUG */ |
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#if 0 |
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for (i = 0; i < pehdr->e_shnum; i++) { |
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pshdr = (Elf_Phdr *) (pexe + pehdr->e_shoff + |
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(i * pehdr->e_shentsize)); |
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if (strcmp(".strtab", get_shstr(pshdr->sh_name)) == 0) |
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break; |
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} |
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fprint_shstr(stdout, pshdr->sh_name); |
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printf("\n"); |
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#endif |
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load_strtab(pehdr, pexe); |
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load_symtab(pehdr, pexe); |
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close(pfile); |
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} |
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char *shstrtab; |
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void |
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load_shstr_tab(Elf_Ehdr * pehdr, char *pexe) |
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{ |
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Elf_Shdr *pshdr; |
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shstrtab = NULL; |
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if (pehdr->e_shstrndx == 0) |
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return; |
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pshdr = (Elf_Shdr *) (pexe + pehdr->e_shoff + |
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(pehdr->e_shstrndx * pehdr->e_shentsize)); |
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shstrtab = (char *) (pexe + pshdr->sh_offset); |
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} |
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void |
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fprint_shstr(FILE * channel, int indx) |
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{ |
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if (shstrtab != NULL) |
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fprintf(channel, "\"%s\"", &(shstrtab[indx])); |
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} |
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char * |
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get_shstr(int indx) |
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{ |
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return &(shstrtab[indx]); |
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} |
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void |
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load_symtab(Elf_Ehdr * pehdr, char *pexe) |
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{ |
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Elf_Sym *symtab; |
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Elf_Shdr *symsect; |
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int symtabsize; |
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Elf_Shdr *psymshdr; |
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Elf_Shdr *pshdr; |
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#ifdef DEBUG |
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char *shname; |
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#endif |
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int i; |
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symtab = NULL; |
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for (i = 0; i < pehdr->e_shnum; i++) { |
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pshdr = (Elf_Shdr *) (pexe + pehdr->e_shoff + |
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(i * pehdr->e_shentsize)); |
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if (SHT_REL != pshdr->sh_type && SHT_RELA != pshdr->sh_type) |
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continue; |
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psymshdr = (Elf_Shdr *) (pexe + pehdr->e_shoff + |
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(pshdr->sh_link * pehdr->e_shentsize)); |
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#ifdef DEBUG |
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fprint_shstr(stdout, pshdr->sh_name); |
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printf("\n"); |
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#endif |
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symtab = (Elf_Sym *) (pexe + psymshdr->sh_offset); |
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symsect = psymshdr; |
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symtabsize = psymshdr->sh_size; |
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#ifdef DEBUG |
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dump_symtab(symsect, symtab, symtabsize); |
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#endif |
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hide_sym(pehdr, symsect, symtab, symtabsize, pshdr->sh_link); |
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} |
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} |
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void |
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dump_symtab(Elf_Shdr * symsect, Elf_Sym * symtab, int symtabsize) |
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{ |
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int i; |
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Elf_Sym *psymtab; |
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for (i = 0; i < (symtabsize / sizeof(Elf_Sym)); i++) { |
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psymtab = &(symtab[i]); |
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if ((psymtab->st_info & 0xf0) == 0x10 && |
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(psymtab->st_shndx != SHN_UNDEF)) { |
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printf("symbol %d:\n", i); |
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printf("st_name %x \"%s\"\n", psymtab->st_name, |
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get_str(psymtab->st_name)); |
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printf("st_value %llx\n", (unsigned long long)psymtab->st_value); |
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printf("st_size %llx\n", (unsigned long long)psymtab->st_size); |
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printf("st_info %x\n", psymtab->st_info); |
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printf("st_other %x\n", psymtab->st_other); |
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printf("st_shndx %x\n", psymtab->st_shndx); |
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} |
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} |
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} |
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char *strtab; |
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int strtabsize; |
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void |
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load_strtab(Elf_Ehdr * pehdr, char *pexe) |
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{ |
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Elf_Shdr *pshdr = NULL; |
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char *shname; |
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int i; |
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strtab = NULL; |
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for (i = 0; i < pehdr->e_shnum; i++) { |
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pshdr = (Elf_Shdr *) (pexe + pehdr->e_shoff + |
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(i * pehdr->e_shentsize)); |
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shname = get_shstr(pshdr->sh_name); |
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if (strcmp(".strtab", shname) == 0) |
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break; |
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} |
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#ifdef DEBUG |
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fprint_shstr(stdout, pshdr->sh_name); |
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printf("\n"); |
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#endif |
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strtab = (char *) (pexe + pshdr->sh_offset); |
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strtabsize = pshdr->sh_size; |
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#ifdef DEBUG |
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dump_strtab(); |
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#endif |
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} |
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void |
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dump_strtab() |
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{ |
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int index; |
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char *pstr; |
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char *pnstr; |
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int i = 0; |
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index = 0; |
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pstr = strtab; |
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while (index < strtabsize) { |
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printf("string %x: \"%s\"\n", i, pstr); |
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pnstr = pstr + strlen(pstr) + 1; |
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index = pnstr - strtab; |
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pstr = pnstr; |
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i++; |
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} |
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} |
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void |
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fprint_str(FILE * channel, int indx) |
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{ |
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if (strtab != NULL) |
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fprintf(channel, "\"%s\"", &(strtab[indx])); |
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} |
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char * |
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get_str(int indx) |
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{ |
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return &(strtab[indx]); |
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} |
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int in_keep_list(char *symbol); |
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void |
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hide_sym(Elf_Ehdr * ehdr, Elf_Shdr * symsect, |
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Elf_Sym * symtab, int symtabsize, int symtabsecnum) |
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{ |
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int i; |
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unsigned char info; |
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Elf_Sym *psymtab; |
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for (i = 0; i < (symtabsize / sizeof(Elf_Sym)); i++) { |
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psymtab = &(symtab[i]); |
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if ((psymtab->st_info & 0xf0) == 0x10 && |
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(psymtab->st_shndx != SHN_UNDEF)) { |
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if (in_keep_list(get_str(psymtab->st_name))) |
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continue; |
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#ifdef DEBUG |
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printf("symbol %d:\n", i); |
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printf("st_name %x \"%s\"\n", psymtab->st_name, |
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get_str(psymtab->st_name)); |
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printf("st_info %x\n", psymtab->st_info); |
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#endif |
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if (!elf_mangle) { |
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info = psymtab->st_info; |
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info = info & 0xf; |
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psymtab->st_info = info; |
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} else { |
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mangle_str(get_str(psymtab->st_name)); |
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} |
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#ifdef DEBUG |
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printf("st_info %x\n", psymtab->st_info); |
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#endif |
334 |
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} |
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} |
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reorder_syms(ehdr, symsect, symtab, symtabsize, symtabsecnum); |
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} |
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void |
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reorder_syms(Elf_Ehdr * ehdr, Elf_Shdr * symsect, |
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Elf_Sym * symtab, int symtabsize, int symtabsecnum) |
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{ |
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int i; |
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int nsyms; |
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int cursym; |
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Elf_Sym *tmpsymtab; |
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Symmap *symmap; |
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349 |
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nsyms = symtabsize / sizeof(Elf_Sym); |
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tmpsymtab = calloc(1, symtabsize); |
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symmap = calloc(nsyms, sizeof(Symmap)); |
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if (!tmpsymtab || !symmap) |
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errc(5, ENOMEM, "calloc"); |
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bcopy(symtab, tmpsymtab, symtabsize); |
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359 |
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cursym = 1; |
360 |
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for (i = 1; i < nsyms; i++) { |
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if ((tmpsymtab[i].st_info & 0xf0) == 0x00) { |
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#ifdef DEBUG |
363 |
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printf("copying l o%d n%d <%s>\n", i, cursym, |
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get_str(tmpsymtab[i].st_name)); |
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#endif |
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|
bcopy(&(tmpsymtab[i]), &(symtab[cursym]), |
367 |
|
|
sizeof(Elf_Sym)); |
368 |
|
|
symmap[i] = cursym; |
369 |
|
|
cursym++; |
370 |
|
|
} |
371 |
|
|
} |
372 |
|
|
symsect->sh_info = cursym; |
373 |
|
|
for (i = 1; i < nsyms; i++) { |
374 |
|
|
if ((tmpsymtab[i].st_info & 0xf0) != 0x00) { |
375 |
|
|
#ifdef DEBUG |
376 |
|
|
printf("copying nl o%d n%d <%s>\n", i, cursym, |
377 |
|
|
get_str(tmpsymtab[i].st_name)); |
378 |
|
|
#endif |
379 |
|
|
bcopy(&(tmpsymtab[i]), &(symtab[cursym]), |
380 |
|
|
sizeof(Elf_Sym)); |
381 |
|
|
symmap[i] = cursym; |
382 |
|
|
cursym++; |
383 |
|
|
} |
384 |
|
|
} |
385 |
|
|
if (cursym != nsyms) { |
386 |
|
|
printf("miscounted symbols somewhere c %d n %d \n", |
387 |
|
|
cursym, nsyms); |
388 |
|
|
exit(5); |
389 |
|
|
} |
390 |
|
|
renum_reloc_syms(ehdr, symmap, symtabsecnum); |
391 |
|
|
free(tmpsymtab); |
392 |
|
|
free(symmap); |
393 |
|
|
} |
394 |
|
|
|
395 |
|
|
void |
396 |
|
|
renum_reloc_syms(Elf_Ehdr * ehdr, Symmap * symmap, int symtabsecnum) |
397 |
|
|
{ |
398 |
|
|
Elf_Shdr *pshdr; |
399 |
|
|
int i, j; |
400 |
|
|
int num_reloc; |
401 |
|
|
Elf_Rel *prel; |
402 |
|
|
Elf_RelA *prela; |
403 |
|
|
int symnum; |
404 |
|
|
|
405 |
|
|
for (i = 0; i < ehdr->e_shnum; i++) { |
406 |
|
|
pshdr = (Elf_Shdr *) (pexe + ehdr->e_shoff + |
407 |
|
|
(i * ehdr->e_shentsize)); |
408 |
|
|
if ((pshdr->sh_type == SHT_RELA) && |
409 |
|
|
pshdr->sh_link == symtabsecnum) { |
410 |
|
|
|
411 |
|
|
#ifdef DEBUG |
412 |
|
|
printf("section %d has rela relocations in symtab\n", i); |
413 |
|
|
#endif |
414 |
|
|
prela = (Elf_RelA *) (pexe + pshdr->sh_offset); |
415 |
|
|
num_reloc = pshdr->sh_size / sizeof(Elf_RelA); |
416 |
|
|
for (j = 0; j < num_reloc; j++) { |
417 |
|
|
symnum = ELF_R_SYM(prela[j].r_info); |
418 |
|
|
#ifdef DEBUG |
419 |
|
|
printf("sym num o %d n %d\n", symnum, |
420 |
|
|
symmap[symnum]); |
421 |
|
|
#endif |
422 |
|
|
prela[j].r_info = ELF_R_INFO(symmap[symnum], |
423 |
|
|
ELF_R_TYPE(prela[j].r_info)); |
424 |
|
|
} |
425 |
|
|
} |
426 |
|
|
if ((pshdr->sh_type == SHT_REL) && |
427 |
|
|
pshdr->sh_link == symtabsecnum) { |
428 |
|
|
#ifdef DEBUG |
429 |
|
|
printf("section %d has rel relocations in symtab\n", i); |
430 |
|
|
#endif |
431 |
|
|
prel = (Elf_Rel *) (pexe + pshdr->sh_offset); |
432 |
|
|
num_reloc = pshdr->sh_size / sizeof(Elf_Rel); |
433 |
|
|
for (j = 0; j < num_reloc; j++) { |
434 |
|
|
symnum = ELF_R_SYM(prel[j].r_info); |
435 |
|
|
#ifdef DEBUG |
436 |
|
|
printf("sym num o %d n %d\n", symnum, |
437 |
|
|
symmap[symnum]); |
438 |
|
|
#endif |
439 |
|
|
prel[j].r_info = ELF_R_INFO(symmap[symnum], |
440 |
|
|
ELF_R_TYPE(prel[j].r_info)); |
441 |
|
|
} |
442 |
|
|
} |
443 |
|
|
} |
444 |
|
|
|
445 |
|
|
} |