tests/newdata.c - platform/external/elfutils.git - Git at Google

 /* Test program for elf_newdata function.
    Copyright (C) 2015 Red Hat, Inc.
    This file is part of elfutils.

    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 <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include "system.h"

 #include ELFUTILS_HEADER(elf)
 #include <gelf.h>

 // Random data string (16 bytes).
 static char *DATA = "123456789ABCDEF";
 static size_t DATA_LEN = 16;

 static void
 add_section_data (Elf *elf, char *buf, size_t len)
 {
   printf ("Adding %zd bytes.\n", len);

   Elf_Scn *scn = elf_getscn (elf, 1);
   if (scn == NULL)
     {
       printf ("couldn't get data section: %s\n", elf_errmsg (-1));
       exit (1);
     }

   Elf_Data *data = elf_newdata (scn);
   if (data == NULL)
     {
       printf ("cannot create newdata for section: %s\n", elf_errmsg (-1));
       exit (1);
     }

   data->d_buf = buf;
   data->d_type = ELF_T_BYTE;
   data->d_size = len;
   data->d_align = 1;
   data->d_version = EV_CURRENT;

   // 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));
       exit (1);
     }

 }

 static Elf *
 create_elf (int fd, int class, int use_mmap)
 {
   Elf *elf = elf_begin (fd, use_mmap ? ELF_C_WRITE_MMAP : ELF_C_WRITE, NULL);
   if (elf == NULL)
     {
       printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));
       exit (1);
     }

   // Create an ELF header.
   if (gelf_newehdr (elf, class) == 0)
     {
       printf ("cannot create ELF header: %s\n", elf_errmsg (-1));
       exit (1);
     }

   GElf_Ehdr ehdr_mem;
   GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem);
   if (ehdr == NULL)
     {
       printf ("cannot get ELF header: %s\n", elf_errmsg (-1));
       exit (1);
     }

   // Initialize header.
   ehdr->e_ident[EI_DATA] = class == ELFCLASS32 ? ELFDATA2LSB : ELFDATA2MSB;
   ehdr->e_ident[EI_OSABI] = ELFOSABI_GNU;
   ehdr->e_type = ET_NONE;
   ehdr->e_machine = class == ELFCLASS32 ? EM_PPC : EM_X86_64;
   ehdr->e_version = EV_CURRENT;

   // Update the ELF header.
   if (gelf_update_ehdr (elf, ehdr) == 0)
     {
       printf ("cannot update ELF header: %s\n", elf_errmsg (-1));
       exit (1);
     }

   // Create a section.
   Elf_Scn *scn = elf_newscn (elf);
   if (scn == NULL)
     {
       printf ("cannot create new section: %s\n", elf_errmsg (-1));
       exit (1);
     }

   GElf_Shdr shdr_mem;
   GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
   if (shdr == NULL)
     {
       printf ("cannot get header for data section: %s\n", elf_errmsg (-1));
       exit (1);
     }

   shdr->sh_type = SHT_PROGBITS;
   shdr->sh_flags = 0;
   shdr->sh_addr = 0;
   shdr->sh_link = SHN_UNDEF;
   shdr->sh_info = SHN_UNDEF;
   shdr->sh_addralign = 1;
   shdr->sh_entsize = 1;
   shdr->sh_name = 0;

   // Finish section, update the header.
   if (gelf_update_shdr (scn, shdr) == 0)
     {
       printf ("cannot update header for DATA section: %s\n", elf_errmsg (-1));
       exit (1);
     }

   // Add some data to the section.
   add_section_data (elf, DATA, DATA_LEN);

   // Write everything to disk.
   if (elf_update (elf, ELF_C_WRITE) < 0)
     {
       printf ("failure in elf_update(WRITE): %s\n", elf_errmsg (-1));
       exit (1);
     }

   return elf;
 }

 static Elf *
 read_elf (int fd, int use_mmap)
 {
   printf ("Reading ELF file\n");
   Elf *elf = elf_begin (fd, use_mmap ? ELF_C_RDWR_MMAP : ELF_C_RDWR, NULL);
   if (elf == NULL)
     {
       printf ("cannot create ELF descriptor read-again: %s\n", elf_errmsg (-1));
       exit (1);
     }

   return elf;
 }

 static void
 check_section_size (Elf *elf, size_t size)
 {
   Elf_Scn *scn = elf_getscn (elf, 1);
   if (scn == NULL)
     {
       printf ("couldn't get data section: %s\n", elf_errmsg (-1));
       exit (1);
     }

   GElf_Shdr shdr_mem;
   GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
   if (shdr == NULL)
     {
       printf ("cannot get header for DATA section: %s\n", elf_errmsg (-1));
       exit (1);
     }

   if (shdr->sh_size == size)
     printf ("OK %zd bytes.\n", size);
   else
     {
       printf ("BAD size, expected %zd, got %" PRIu64 "\n",
 	      size, shdr->sh_size);
       exit (-1);
     }
 }

 static void
 check_section_data (Elf *elf, char *data, size_t len, size_t times)
 {
   Elf_Scn *scn = elf_getscn (elf, 1);
   if (scn == NULL)
     {
       printf ("couldn't get data section: %s\n", elf_errmsg (-1));
       exit (1);
     }

   Elf_Data *d = NULL;
   for (size_t i = 0; i < times; i++)
     {
       if (d == NULL || i * len >= d->d_off + d->d_size)
 	{
 	  d = elf_getdata (scn, d);
 	  if (d == NULL)
 	    {
 	      printf ("cannot get data for section item %zd: %s\n",
 		      i, elf_errmsg (-1));
 	      exit (1);
 	    }
 	  else
 	    printf ("OK, section data item %zd (d_off: %" PRId64
 		    ", d_size: %zd)\n", i, d->d_off, d->d_size);
 	}
       char *d_data = (char *) d->d_buf + (len * i) - d->d_off;
       printf ("%zd data (d_off: %" PRId64
 	      ", len * i: %zd): (%p + %" PRId64 ") %s\n",
 	      i, d->d_off, len * i, d->d_buf, (len * i) - d->d_off, d_data);
       if (memcmp (data, d_data, len) != 0)
 	{
 	  printf ("Got bad data in section for item %zd.\n", i);
 	  exit (1);
 	}
     }
 }

 static void
 check_elf (int class, int use_mmap)
 {
   static const char *fname;
   if (class == ELFCLASS32)
     fname = use_mmap ? "newdata.elf32.mmap" : "newdata.elf32";
   else
     fname = use_mmap ? "newdata.elf64.mmap" : "newdata.elf64";

   printf ("\ncheck_elf: %s\n", fname);

   int fd = open (fname, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE);
   if (fd == -1)
     {
       printf ("cannot create `%s': %s\n", fname, strerror (errno));
       exit (1);
     }

   Elf *elf = create_elf (fd, class, use_mmap);
   check_section_size (elf, DATA_LEN);
   check_section_data (elf, DATA, DATA_LEN, 1);

   // Add some more data (won't be written to disk).
   add_section_data (elf, DATA, DATA_LEN);
   check_section_size (elf, 2 * DATA_LEN);
   check_section_data (elf, DATA, DATA_LEN, 2);

   if (elf_end (elf) != 0)
     {
       printf ("failure in elf_end: %s\n", elf_errmsg (-1));
       exit (1);
     }

   close (fd);

   // Read the ELF from disk now.  And add new data directly.
   fd = open (fname, O_RDONLY);
   if (fd == -1)
     {
       printf ("cannot open `%s' read-only: %s\n", fname, strerror (errno));
       exit (1);
     }

   elf = read_elf (fd, use_mmap);
   check_section_size (elf, DATA_LEN);
   // But don't check contents, that would read the data...

   // Add some more data.
   add_section_data (elf, DATA, DATA_LEN);
   check_section_size (elf, 2 * DATA_LEN);
   check_section_data (elf, DATA, DATA_LEN, 2);

   // And some more.
   add_section_data (elf, DATA, DATA_LEN);
   check_section_size (elf, 3 * DATA_LEN);
   check_section_data (elf, DATA, DATA_LEN, 3);

   if (elf_end (elf) != 0)
     {
       printf ("failure in elf_end: %s\n", elf_errmsg (-1));
       exit (1);
     }

   close (fd);

   // Read the ELF from disk now.  And add new data after raw reading.
   fd = open (fname, O_RDONLY);
   if (fd == -1)
     {
       printf ("cannot open `%s' read-only: %s\n", fname, strerror (errno));
       exit (1);
     }

   elf = read_elf (fd, use_mmap);
   check_section_size (elf, DATA_LEN);
   // But don't check contents, that would read the data...

   // Get raw data before adding new data.
   Elf_Scn *scn = elf_getscn (elf, 1);
   if (scn == NULL)
     {
       printf ("couldn't get data section: %s\n", elf_errmsg (-1));
       exit (1);
     }

   printf ("elf_rawdata\n");
   Elf_Data *data = elf_rawdata (scn, NULL);
   if (data == NULL)
     {
       printf ("couldn't get raw data from section: %s\n", elf_errmsg (-1));
       exit (1);
     }

   if (data->d_size != DATA_LEN)
     {
       printf ("Unexpected Elf_Data: %zd", data->d_size);
       exit (1);
     }

   // Now add more data.
   add_section_data (elf, DATA, DATA_LEN);
   check_section_size (elf, 2 * DATA_LEN);
   check_section_data (elf, DATA, DATA_LEN, 2);

   // And some more.
   add_section_data (elf, DATA, DATA_LEN);
   check_section_size (elf, 3 * DATA_LEN);
   check_section_data (elf, DATA, DATA_LEN, 3);

   if (elf_end (elf) != 0)
     {
       printf ("failure in elf_end: %s\n", elf_errmsg (-1));
       exit (1);
     }

   close (fd);

   // Read the ELF from disk now.  And add new data after data reading.
   fd = open (fname, O_RDONLY);
   if (fd == -1)
     {
       printf ("cannot open `%s' read-only: %s\n", fname, strerror (errno));
       exit (1);
     }

   elf = read_elf (fd, use_mmap);
   check_section_size (elf, DATA_LEN);
   // Get (converted) data before adding new data.
   check_section_data (elf, DATA, DATA_LEN, 1);

   printf ("elf_getdata\n");

   // Now add more data.
   add_section_data (elf, DATA, DATA_LEN);
   check_section_size (elf, 2 * DATA_LEN);
   check_section_data (elf, DATA, DATA_LEN, 2);

   // And some more.
   add_section_data (elf, DATA, DATA_LEN);
   check_section_size (elf, 3 * DATA_LEN);
   check_section_data (elf, DATA, DATA_LEN, 3);

   if (elf_end (elf) != 0)
     {
       printf ("failure in elf_end: %s\n", elf_errmsg (-1));
       exit (1);
     }

   close (fd);

   unlink (fname);
 }

 int
 main (int argc __attribute__ ((unused)), char *argv[] __attribute__ ((unused)))
 {
   // Initialize libelf.
   elf_version (EV_CURRENT);

   // Fill holes with something non-zero to more easily spot bad data.
   elf_fill ('X');

   check_elf (ELFCLASS32, 0);
   check_elf (ELFCLASS32, 1);
   check_elf (ELFCLASS64, 0);
   check_elf (ELFCLASS64, 1);

   return 0;
 }
	/* Test program for elf_newdata function.
	Copyright (C) 2015 Red Hat, Inc.
	This file is part of elfutils.

	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 <errno.h>
	#include <fcntl.h>
	#include <inttypes.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>
	#include "system.h"

	#include ELFUTILS_HEADER(elf)
	#include <gelf.h>

	// Random data string (16 bytes).
	static char *DATA = "123456789ABCDEF";
	static size_t DATA_LEN = 16;

	static void
	add_section_data (Elf elf, char buf, size_t len)
	{
	printf ("Adding %zd bytes.\n", len);

	Elf_Scn *scn = elf_getscn (elf, 1);
	if (scn == NULL)
	{
	printf ("couldn't get data section: %s\n", elf_errmsg (-1));
	exit (1);
	}

	Elf_Data *data = elf_newdata (scn);
	if (data == NULL)
	{
	printf ("cannot create newdata for section: %s\n", elf_errmsg (-1));
	exit (1);
	}

	data->d_buf = buf;
	data->d_type = ELF_T_BYTE;
	data->d_size = len;
	data->d_align = 1;
	data->d_version = EV_CURRENT;

	// 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));
	exit (1);
	}

	}

	static Elf *
	create_elf (int fd, int class, int use_mmap)
	{
	Elf *elf = elf_begin (fd, use_mmap ? ELF_C_WRITE_MMAP : ELF_C_WRITE, NULL);
	if (elf == NULL)
	{
	printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));
	exit (1);
	}

	// Create an ELF header.
	if (gelf_newehdr (elf, class) == 0)
	{
	printf ("cannot create ELF header: %s\n", elf_errmsg (-1));
	exit (1);
	}

	GElf_Ehdr ehdr_mem;
	GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem);
	if (ehdr == NULL)
	{
	printf ("cannot get ELF header: %s\n", elf_errmsg (-1));
	exit (1);
	}

	// Initialize header.
	ehdr->e_ident[EI_DATA] = class == ELFCLASS32 ? ELFDATA2LSB : ELFDATA2MSB;
	ehdr->e_ident[EI_OSABI] = ELFOSABI_GNU;
	ehdr->e_type = ET_NONE;
	ehdr->e_machine = class == ELFCLASS32 ? EM_PPC : EM_X86_64;
	ehdr->e_version = EV_CURRENT;

	// Update the ELF header.
	if (gelf_update_ehdr (elf, ehdr) == 0)
	{
	printf ("cannot update ELF header: %s\n", elf_errmsg (-1));
	exit (1);
	}

	// Create a section.
	Elf_Scn *scn = elf_newscn (elf);
	if (scn == NULL)
	{
	printf ("cannot create new section: %s\n", elf_errmsg (-1));
	exit (1);
	}

	GElf_Shdr shdr_mem;
	GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
	if (shdr == NULL)
	{
	printf ("cannot get header for data section: %s\n", elf_errmsg (-1));
	exit (1);
	}

	shdr->sh_type = SHT_PROGBITS;
	shdr->sh_flags = 0;
	shdr->sh_addr = 0;
	shdr->sh_link = SHN_UNDEF;
	shdr->sh_info = SHN_UNDEF;
	shdr->sh_addralign = 1;
	shdr->sh_entsize = 1;
	shdr->sh_name = 0;

	// Finish section, update the header.
	if (gelf_update_shdr (scn, shdr) == 0)
	{
	printf ("cannot update header for DATA section: %s\n", elf_errmsg (-1));
	exit (1);
	}

	// Add some data to the section.
	add_section_data (elf, DATA, DATA_LEN);

	// Write everything to disk.
	if (elf_update (elf, ELF_C_WRITE) < 0)
	{
	printf ("failure in elf_update(WRITE): %s\n", elf_errmsg (-1));
	exit (1);
	}

	return elf;
	}

	static Elf *
	read_elf (int fd, int use_mmap)
	{
	printf ("Reading ELF file\n");
	Elf *elf = elf_begin (fd, use_mmap ? ELF_C_RDWR_MMAP : ELF_C_RDWR, NULL);
	if (elf == NULL)
	{
	printf ("cannot create ELF descriptor read-again: %s\n", elf_errmsg (-1));
	exit (1);
	}

	return elf;
	}

	static void
	check_section_size (Elf *elf, size_t size)
	{
	Elf_Scn *scn = elf_getscn (elf, 1);
	if (scn == NULL)
	{
	printf ("couldn't get data section: %s\n", elf_errmsg (-1));
	exit (1);
	}

	GElf_Shdr shdr_mem;
	GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
	if (shdr == NULL)
	{
	printf ("cannot get header for DATA section: %s\n", elf_errmsg (-1));
	exit (1);
	}

	if (shdr->sh_size == size)
	printf ("OK %zd bytes.\n", size);
	else
	{
	printf ("BAD size, expected %zd, got %" PRIu64 "\n",
	size, shdr->sh_size);
	exit (-1);
	}
	}

	static void
	check_section_data (Elf elf, char data, size_t len, size_t times)
	{
	Elf_Scn *scn = elf_getscn (elf, 1);
	if (scn == NULL)
	{
	printf ("couldn't get data section: %s\n", elf_errmsg (-1));
	exit (1);
	}

	Elf_Data *d = NULL;
	for (size_t i = 0; i < times; i++)
	{
	if (d == NULL \|\| i * len >= d->d_off + d->d_size)
	{
	d = elf_getdata (scn, d);
	if (d == NULL)
	{
	printf ("cannot get data for section item %zd: %s\n",
	i, elf_errmsg (-1));
	exit (1);
	}
	else
	printf ("OK, section data item %zd (d_off: %" PRId64
	", d_size: %zd)\n", i, d->d_off, d->d_size);
	}
	char d_data = (char ) d->d_buf + (len * i) - d->d_off;
	printf ("%zd data (d_off: %" PRId64
	", len * i: %zd): (%p + %" PRId64 ") %s\n",
	i, d->d_off, len * i, d->d_buf, (len * i) - d->d_off, d_data);
	if (memcmp (data, d_data, len) != 0)
	{
	printf ("Got bad data in section for item %zd.\n", i);
	exit (1);
	}
	}
	}

	static void
	check_elf (int class, int use_mmap)
	{
	static const char *fname;
	if (class == ELFCLASS32)
	fname = use_mmap ? "newdata.elf32.mmap" : "newdata.elf32";
	else
	fname = use_mmap ? "newdata.elf64.mmap" : "newdata.elf64";

	printf ("\ncheck_elf: %s\n", fname);

	int fd = open (fname, O_RDWR\|O_CREAT\|O_TRUNC, DEFFILEMODE);
	if (fd == -1)
	{
	printf ("cannot create `%s': %s\n", fname, strerror (errno));
	exit (1);
	}

	Elf *elf = create_elf (fd, class, use_mmap);
	check_section_size (elf, DATA_LEN);
	check_section_data (elf, DATA, DATA_LEN, 1);

	// Add some more data (won't be written to disk).
	add_section_data (elf, DATA, DATA_LEN);
	check_section_size (elf, 2 * DATA_LEN);
	check_section_data (elf, DATA, DATA_LEN, 2);

	if (elf_end (elf) != 0)
	{
	printf ("failure in elf_end: %s\n", elf_errmsg (-1));
	exit (1);
	}

	close (fd);

	// Read the ELF from disk now. And add new data directly.
	fd = open (fname, O_RDONLY);
	if (fd == -1)
	{
	printf ("cannot open `%s' read-only: %s\n", fname, strerror (errno));
	exit (1);
	}

	elf = read_elf (fd, use_mmap);
	check_section_size (elf, DATA_LEN);
	// But don't check contents, that would read the data...

	// Add some more data.
	add_section_data (elf, DATA, DATA_LEN);
	check_section_size (elf, 2 * DATA_LEN);
	check_section_data (elf, DATA, DATA_LEN, 2);

	// And some more.
	add_section_data (elf, DATA, DATA_LEN);
	check_section_size (elf, 3 * DATA_LEN);
	check_section_data (elf, DATA, DATA_LEN, 3);

	if (elf_end (elf) != 0)
	{
	printf ("failure in elf_end: %s\n", elf_errmsg (-1));
	exit (1);
	}

	close (fd);

	// Read the ELF from disk now. And add new data after raw reading.
	fd = open (fname, O_RDONLY);
	if (fd == -1)
	{
	printf ("cannot open `%s' read-only: %s\n", fname, strerror (errno));
	exit (1);
	}

	elf = read_elf (fd, use_mmap);
	check_section_size (elf, DATA_LEN);
	// But don't check contents, that would read the data...

	// Get raw data before adding new data.
	Elf_Scn *scn = elf_getscn (elf, 1);
	if (scn == NULL)
	{
	printf ("couldn't get data section: %s\n", elf_errmsg (-1));
	exit (1);
	}

	printf ("elf_rawdata\n");
	Elf_Data *data = elf_rawdata (scn, NULL);
	if (data == NULL)
	{
	printf ("couldn't get raw data from section: %s\n", elf_errmsg (-1));
	exit (1);
	}

	if (data->d_size != DATA_LEN)
	{
	printf ("Unexpected Elf_Data: %zd", data->d_size);
	exit (1);
	}

	// Now add more data.
	add_section_data (elf, DATA, DATA_LEN);
	check_section_size (elf, 2 * DATA_LEN);
	check_section_data (elf, DATA, DATA_LEN, 2);

	// And some more.
	add_section_data (elf, DATA, DATA_LEN);
	check_section_size (elf, 3 * DATA_LEN);
	check_section_data (elf, DATA, DATA_LEN, 3);

	if (elf_end (elf) != 0)
	{
	printf ("failure in elf_end: %s\n", elf_errmsg (-1));
	exit (1);
	}

	close (fd);

	// Read the ELF from disk now. And add new data after data reading.
	fd = open (fname, O_RDONLY);
	if (fd == -1)
	{
	printf ("cannot open `%s' read-only: %s\n", fname, strerror (errno));
	exit (1);
	}

	elf = read_elf (fd, use_mmap);
	check_section_size (elf, DATA_LEN);
	// Get (converted) data before adding new data.
	check_section_data (elf, DATA, DATA_LEN, 1);

	printf ("elf_getdata\n");

	// Now add more data.
	add_section_data (elf, DATA, DATA_LEN);
	check_section_size (elf, 2 * DATA_LEN);
	check_section_data (elf, DATA, DATA_LEN, 2);

	// And some more.
	add_section_data (elf, DATA, DATA_LEN);
	check_section_size (elf, 3 * DATA_LEN);
	check_section_data (elf, DATA, DATA_LEN, 3);

	if (elf_end (elf) != 0)
	{
	printf ("failure in elf_end: %s\n", elf_errmsg (-1));
	exit (1);
	}

	close (fd);

	unlink (fname);
	}

	int
	main (int argc __attribute__ ((unused)), char *argv[] __attribute__ ((unused)))
	{
	// Initialize libelf.
	elf_version (EV_CURRENT);

	// Fill holes with something non-zero to more easily spot bad data.
	elf_fill ('X');

	check_elf (ELFCLASS32, 0);
	check_elf (ELFCLASS32, 1);
	check_elf (ELFCLASS64, 0);
	check_elf (ELFCLASS64, 1);

	return 0;
	}