Attachment 211151 Details for Bug 312011 – Simple testcase (but check rather /proc/self/maps).

Simple testcase (but check rather /proc/self/maps).

vdso-size.c (text/plain), 8.05 KB, created by Jan Kratochvil on 2007-09-28 23:52:42 UTC

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Creator: Jan Kratochvil

Created: 2007-09-28 23:52:42 UTC

Size: 8.05 KB

patch

obsolete

>/* RHEL-5.1beta (kernel-PAE-2.6.18-48.el5.i686): No bugs.  */
>/* RHEL-4.5 (kernel-2.6.9-55.0.9.EL.ia64): No bugs.  */
>
>/* Test VDSO size to be 1 page in `/proc/self/maps'.
>   Copyright (C) 2005, 2007 Red Hat, Inc.
>   This file is part of Red Hat elfutils.
>
>   Red Hat elfutils 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; version 2 of the License.
>
>   Red Hat 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 Red Hat elfutils; if not, write to the Free Software Foundation,
>   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
>
>   In addition, as a special exception, Red Hat, Inc. gives You the
>   additional right to link the code of Red Hat elfutils with code licensed
>   under any Open Source Initiative certified open source license
>   (http://www.opensource.org/licenses/index.php) which requires the
>   distribution of source code with any binary distribution and to
>   distribute linked combinations of the two.  Non-GPL Code permitted under
>   this exception must only link to the code of Red Hat elfutils through
>   those well defined interfaces identified in the file named EXCEPTION
>   found in the source code files (the "Approved Interfaces").  The files
>   of Non-GPL Code may instantiate templates or use macros or inline
>   functions from the Approved Interfaces without causing the resulting
>   work to be covered by the GNU General Public License.  Only Red Hat,
>   Inc. may make changes or additions to the list of Approved Interfaces.
>   Red Hat's grant of this exception is conditioned upon your not adding
>   any new exceptions.  If you wish to add a new Approved Interface or
>   exception, please contact Red Hat.  You must obey the GNU General Public
>   License in all respects for all of the Red Hat elfutils code and other
>   code used in conjunction with Red Hat elfutils except the Non-GPL Code
>   covered by this exception.  If you modify this file, you may extend this
>   exception to your version of the file, but you are not obligated to do
>   so.  If you do not wish to provide this exception without modification,
>   you must delete this exception statement from your version and license
>   this file solely under the GPL without exception.
>
>   Red Hat elfutils is an included package of the Open Invention Network.
>   An included package of the Open Invention Network is a package for which
>   Open Invention Network licensees cross-license their patents.  No patent
>   license is granted, either expressly or impliedly, by designation as an
>   included package.  Should you wish to participate in the Open Invention
>   Network licensing program, please visit www.openinventionnetwork.com
>   <http://www.openinventionnetwork.com>.  */
>
>/* The reason for SKIP on many systems:
>   VDSO memory without AT_SYSINFO_EHDR is present on systems where it is
>   either disabled by `/proc/sys/kernel/vdso' or not needed.
>   In these cases the VDSO is never present in backtraces anyway.
>   We would fail on some systems which behave right on the real runs.  */
>
>#define _GNU_SOURCE
>
>#include <inttypes.h>
>#include <sys/types.h>
>#include <errno.h>
>#include <stdio.h>
>#include <stdio_ext.h>
>#include <stdbool.h>
>#include <string.h>
>#include <stdlib.h>
>#include <fcntl.h>
>#include <unistd.h>
>#include <assert.h>
>#include <endian.h>
>
>/* Provide the <gelf.h> symbol substitutions.  */
>typedef uint64_t Elf64_Addr;
>typedef Elf64_Addr GElf_Addr;
>typedef struct
>{
>  uint64_t a_type;		/* Entry type */
>  union
>    {
>      uint64_t a_val;		/* Integer value */
>      /* We use to have pointer elements added here.  We cannot do that,
>	 though, since it does not work when using 32-bit definitions
>	 on 64-bit platforms and vice versa.  */
>    } a_un;
>} Elf64_auxv_t;
>typedef struct
>{
>  uint32_t a_type;		/* Entry type */
>  union
>    {
>      uint32_t a_val;		/* Integer value */
>      /* We use to have pointer elements added here.  We cannot do that,
>	 though, since it does not work when using 32-bit definitions
>	 on 64-bit platforms and vice versa.  */
>    } a_un;
>} Elf32_auxv_t;
>/* <linux/auxvec.h> is not present on RHEL-4.5.  */
>#define AT_SYSINFO_EHDR		33
>
>
>
>#define PROCMAPSFMT	"/proc/%d/maps"
>#define PROCAUXVFMT	"/proc/%d/auxv"
>
>
>/* Search /proc/PID/auxv for the AT_SYSINFO_EHDR tag.  */
>
>static int
>find_sysinfo_ehdr (pid_t pid, GElf_Addr *sysinfo_ehdr)
>{
>  char *fname;
>  if (asprintf (&fname, PROCAUXVFMT, pid) < 0)
>    return ENOMEM;
>
>  int fd = open64 (fname, O_RDONLY);
>  free (fname);
>  if (fd < 0)
>    return errno == ENOENT ? 0 : errno;
>
>  ssize_t nread;
>  do
>    {
>      union
>      {
>	char buffer[sizeof (long int) * 2 * 64];
>	Elf64_auxv_t a64[sizeof (long int) * 2 * 64 / sizeof (Elf64_auxv_t)];
>	Elf32_auxv_t a32[sizeof (long int) * 2 * 32 / sizeof (Elf32_auxv_t)];
>      } d;
>      nread = read (fd, &d, sizeof d);
>      if (nread > 0)
>	{
>	  size_t i;
>
>	  switch (sizeof (long int))
>	    {
>	    case 4:
>	      for (i = 0; (char *) &d.a32[i] < &d.buffer[nread]; ++i)
>		if (d.a32[i].a_type == AT_SYSINFO_EHDR)
>		  {
>		    *sysinfo_ehdr = d.a32[i].a_un.a_val;
>		    nread = 0;
>		    break;
>		  }
>	      break;
>	    case 8:
>	      for (i = 0; (char *) &d.a64[i] < &d.buffer[nread]; ++i)
>		if (d.a64[i].a_type == AT_SYSINFO_EHDR)
>		  {
>		    *sysinfo_ehdr = d.a64[i].a_un.a_val;
>		    nread = 0;
>		    break;
>		  }
>	      break;
>	    default:
>	      abort ();
>	      break;
>	    }
>	}
>    }
>  while (nread > 0);
>
>  close (fd);
>
>  return nread < 0 ? errno : 0;
>}
>
>static int
>check (GElf_Addr start, GElf_Addr end)
>{
>  if (end < start)
>    return 1;
>
>#if defined __ia64__
>  /* getpagesize() == 16K and VDSO == 2 * 64KB.  */
>  return end - start == 8 * getpagesize() ? 0 : 1;
>#elif defined __ppc64__ || defined __powerpc64__ \
>      || defined __ppc__ || defined __powerpc__
>  /* getpagesize() == 64K and VDSO == 128KB.  */
>  return end - start == 2 * getpagesize() ? 0 : 1;
>#else
>  return end - start == getpagesize() ? 0 : 1;
>#endif
>}
>
>static int
>proc_maps_report (FILE *f, GElf_Addr sysinfo_ehdr, pid_t pid)
>{
>  char *line = NULL;
>  size_t linesz;
>  ssize_t len;
>  while ((len = getline (&line, &linesz, f)) > 0)
>    {
>      if (line[len - 1] == '\n')
>	line[len - 1] = '\0';
>
>      GElf_Addr start, end;
>      int nread = -1;
>      char *filename = NULL;
>      /* FILENAME may be missing there but we must not stop on such entry.  */
>      if (sscanf (line, "%" PRIx64 "-%" PRIx64 " %*s %*x %*x:%*x %*i %n %as",
>		  &start, &end, &nread, &filename) < 2
>	  || nread <= 0)
>	{
>	  free (line);
>	  free (filename);
>	  /* Should not happen.  Considered as FAIl.  */
>	  return 1;
>	}
>
>      /* If this is the special mapping AT_SYSINFO_EHDR pointed us at,
>	 report the last one and then this special one.  */
>      if ((start == sysinfo_ehdr && start != 0)
>/* VDSO memory without AT_SYSINFO_EHDR is present on systems where it is
>   either disabled by `/proc/sys/kernel/vdso' or not needed.
>   In these cases the VDSO is never present in backtraces anyway.
>   We would fail on some systems which behave right on the real runs.  */
>#if 0
>	  || (filename != NULL && strcmp (filename, "[vdso]") == 0)
>#endif
>	  )
>        {
>	  int retval = check (start, end);
>
>	  free (line);
>	  free (filename);
>	  return retval;
>	}
>      free (filename);
>    }
>  free (line);
>
>  /* VDSO has not been found so its state cannot be a Frysk showstopper.  */
>  return 77;
>}
>
>int
>main (void)
>{
>  pid_t pid = getpid ();
>  int retval;
>
>  /* We'll notice the AT_SYSINFO_EHDR address specially when we hit it.  */
>  GElf_Addr sysinfo_ehdr = 0;
>  int result = find_sysinfo_ehdr (pid, &sysinfo_ehdr);
>  if (result != 0)
>    return result;
>
>  char *fname;
>  if (asprintf (&fname, PROCMAPSFMT, pid) < 0)
>    return ENOMEM;
>
>  FILE *f = fopen (fname, "r");
>  free (fname);
>  if (f == NULL)
>    return errno;
>
>  (void) __fsetlocking (f, FSETLOCKING_BYCALLER);
>
>  retval = proc_maps_report (f, sysinfo_ehdr, pid);
>
>  fclose (f);
>
>  return retval;
>}

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Attachments on bug 312011: 211151