Retro68/elfutils/tests/alldts.c
Wolfgang Thaller d21be3b4e1 Add elfutils-0.170
(from https://sourceware.org/elfutils/, GPL/LGPL licensed)
2017-09-21 21:04:42 +02:00

271 lines
7.6 KiB
C

/* Create an ELF file with all the DT_* flags set.
Copyright (C) 2011, 2016 Red Hat, Inc.
This file is part of elfutils.
Written by Marek Polacek <mpolacek@redhat.com>, 2011.
This file is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
elfutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include ELFUTILS_HEADER(dwelf)
#include <elf.h>
#include <gelf.h>
#include <fcntl.h>
#include <libelf.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int
main (void)
{
static const char fname[] = "testfile-alldts";
Dwelf_Strtab *shst;
Dwelf_Strent *dynscn;
Dwelf_Strent *shstrtabse;
const Elf32_Sword dtflags[] =
{
DT_NULL, DT_NEEDED, DT_PLTRELSZ, DT_PLTGOT,
DT_HASH, DT_STRTAB, DT_SYMTAB, DT_RELA,
DT_RELASZ, DT_RELAENT, DT_STRSZ, DT_SYMENT,
DT_INIT, DT_FINI, DT_SONAME, DT_RPATH,
DT_SYMBOLIC, DT_REL, DT_RELSZ, DT_RELENT,
DT_PLTREL, DT_DEBUG, DT_TEXTREL, DT_JMPREL,
DT_BIND_NOW, DT_INIT_ARRAY, DT_FINI_ARRAY,
DT_INIT_ARRAYSZ, DT_FINI_ARRAYSZ, DT_RUNPATH,
DT_FLAGS, DT_ENCODING, DT_PREINIT_ARRAY,
DT_PREINIT_ARRAYSZ, DT_VERSYM, DT_GNU_PRELINKED,
DT_GNU_CONFLICTSZ, DT_GNU_LIBLISTSZ, DT_CHECKSUM,
DT_PLTPADSZ, DT_MOVEENT, DT_MOVESZ, DT_FEATURE_1,
DT_POSFLAG_1, DT_SYMINSZ, DT_SYMINENT, DT_GNU_HASH,
DT_TLSDESC_PLT, DT_TLSDESC_GOT, DT_GNU_CONFLICT,
DT_GNU_LIBLIST, DT_CONFIG, DT_DEPAUDIT, DT_AUDIT,
DT_PLTPAD, DT_MOVETAB, DT_SYMINFO, DT_RELACOUNT,
DT_RELCOUNT, DT_FLAGS_1, DT_VERDEF, DT_VERDEFNUM,
DT_VERNEED, DT_VERNEEDNUM, DT_AUXILIARY, DT_FILTER
};
const int ndtflags = sizeof (dtflags) / sizeof (dtflags[0]);
/* We use no threads here which can interfere with handling a stream. */
(void) __fsetlocking (stdout, FSETLOCKING_BYCALLER);
/* Open the file. */
int fd = open (fname, O_RDWR | O_CREAT | O_TRUNC, 0666);
if (fd == -1)
{
printf ("cannot open `%s': %m\n", fname);
return 1;
}
/* Tell the library which version are we expecting. */
elf_version (EV_CURRENT);
/* Create an ELF descriptor. */
Elf *elf = elf_begin (fd, ELF_C_WRITE, NULL);
if (elf == NULL)
{
printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));
return 1;
}
/* Create an ELF header. */
Elf32_Ehdr *ehdr = elf32_newehdr (elf);
if (ehdr == NULL)
{
printf ("cannot create ELF header: %s\n", elf_errmsg (-1));
return 1;
}
ehdr->e_ident[0] = 42;
ehdr->e_ident[5] = 1;
ehdr->e_ident[6] = 2;
ehdr->e_type = ET_EXEC;
ehdr->e_machine = EM_386;
ehdr->e_version = 1;
ehdr->e_ehsize = 1;
ehdr->e_shnum = 3;
elf_flagehdr (elf, ELF_C_SET, ELF_F_DIRTY);
/* Create the program headers. */
Elf32_Phdr *phdr = elf32_newphdr (elf, 2);
if (phdr == NULL)
{
printf ("cannot create program headers: %s\n", elf_errmsg (-1));
return 1;
}
phdr[0].p_type = PT_PHDR;
phdr[1].p_type = PT_DYNAMIC;
elf_flagphdr (elf, ELF_C_SET, ELF_F_DIRTY);
shst = dwelf_strtab_init (true);
/* Create the .dynamic section. */
Elf_Scn *scn = elf_newscn (elf);
if (scn == NULL)
{
printf ("cannot create DYNAMIC section: %s\n", elf_errmsg (-1));
return 1;
}
Elf32_Shdr *shdr = elf32_getshdr (scn);
if (shdr == NULL)
{
printf ("cannot get header for DYNAMIC section: %s\n", elf_errmsg (-1));
return 1;
}
dynscn = dwelf_strtab_add (shst, ".dynamic");
/* We'll need to know the section offset. But this will be set up
by elf_update later, so for now just store the address. */
const Elf32_Off *const dynscn_offset = &shdr->sh_offset;
shdr->sh_type = SHT_DYNAMIC;
shdr->sh_flags = SHF_ALLOC | SHF_WRITE;
shdr->sh_link = SHN_UNDEF;
shdr->sh_info = SHN_UNDEF;
/* This section will start here. */
shdr->sh_addr = 0x1a0;
/* Create new section data. */
Elf_Data *data = elf_newdata (scn);
if (data == NULL)
{
printf ("cannot create data for DYNAMIC section: %s\n", elf_errmsg (-1));
return 1;
}
/* Allocate memory for all the .dynamic entries. */
Elf32_Dyn *dyn = malloc (ndtflags * sizeof (Elf32_Dyn));
if (dyn == NULL)
{
printf ("malloc failed: %m\n");
return 1;
}
/* Now write all the DT_* flags. */
for (int i = 0; i < ndtflags; ++i)
{
dyn[i].d_tag = dtflags[i];
dyn[i].d_un.d_val = 0xdeadbeef;
}
/* Set the pointer to allocated memory. */
data->d_buf = dyn;
data->d_type = ELF_T_DYN;
data->d_version = EV_CURRENT;
data->d_size = ndtflags * sizeof (Elf32_Dyn);
data->d_align = 0x8;
/* Create .shstrtab section. */
scn = elf_newscn (elf);
if (scn == NULL)
{
printf ("cannot create SHSTRTAB section: %s\n", elf_errmsg (-1));
return 1;
}
shdr = elf32_getshdr (scn);
if (shdr == NULL)
{
printf ("cannot get header for SHSTRTAB section: %s\n", elf_errmsg (-1));
return 1;
}
shstrtabse = dwelf_strtab_add (shst, ".shstrtab");
shdr->sh_type = SHT_STRTAB;
shdr->sh_flags = 0;
shdr->sh_addr = 0;
shdr->sh_link = SHN_UNDEF;
shdr->sh_info = SHN_UNDEF;
shdr->sh_entsize = 1;
/* We have to store the section index in the ELF header. */
ehdr->e_shstrndx = elf_ndxscn (scn);
data = elf_newdata (scn);
if (data == NULL)
{
printf ("cannot create data SHSTRTAB section: %s\n", elf_errmsg (-1));
return 1;
}
/* No more sections, finalize the section header string table. */
dwelf_strtab_finalize (shst, data);
elf32_getshdr (elf_getscn (elf, 1))->sh_name = dwelf_strent_off (dynscn);
shdr->sh_name = dwelf_strent_off (shstrtabse);
/* Let the library compute the internal structure information. */
if (elf_update (elf, ELF_C_NULL) < 0)
{
printf ("failure in elf_update(NULL): %s\n", elf_errmsg (-1));
return 1;
}
ehdr = elf32_getehdr (elf);
phdr[0].p_offset = ehdr->e_phoff;
phdr[0].p_vaddr = ehdr->e_phoff;
phdr[0].p_paddr = ehdr->e_phoff;
phdr[0].p_flags = PF_R | PF_X;
phdr[0].p_filesz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT);
phdr[0].p_memsz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT);
phdr[0].p_align = sizeof (Elf32_Word);
phdr[1].p_flags = PF_W | PF_R;
phdr[1].p_offset = *dynscn_offset;
/* Set up the start of this segment to equal start address of the
.dynamic section. */
phdr[1].p_vaddr = 0x1a0;
phdr[1].p_paddr = 0x1a0;
phdr[1].p_align = 2 * sizeof (Elf32_Word);
phdr[1].p_filesz = ndtflags * sizeof (Elf32_Dyn);
phdr[1].p_memsz = ndtflags * sizeof (Elf32_Dyn);
/* Write out the file. */
if (elf_update (elf, ELF_C_WRITE) < 0)
{
printf ("failure in elf_update(WRITE): %s\n", elf_errmsg (-1));
return 1;
}
/* We don't need the string table anymore. */
dwelf_strtab_free (shst);
/* And the data allocated in the .shstrtab section. */
free (data->d_buf);
/* And the dynamic entries. */
free (dyn);
/* All done. */
if (elf_end (elf) != 0)
{
printf ("failure in elf_end: %s\n", elf_errmsg (-1));
return 1;
}
return 0;
}