ldconfig: remove chroot

[Andreas Jaeger <aj at suse dot de>]

Hi Uli,

please test the appended patch.  Now ldconfig doesn't call chroot
anymore.

Ok to commit?

Andreas

2000-09-26  Andreas Jaeger  <aj@suse.de>

	* elf/ldconfig.c (parse_opt): Remove trailing slashes from opt_chroot.
	(search_dir): Handle chroot.
	(setup_file): New function.
	(main): Use it to handle chroot.

============================================================
Index: elf/ldconfig.c
--- elf/ldconfig.c	2000/09/24 18:35:02	1.7
+++ elf/ldconfig.c	2000/09/26 14:03:40
@@ -105,14 +105,16 @@
 /* Path to root for chroot.  */
 static char *opt_chroot;
 
+static int use_chroot;
+
 /* Manually link given shared libraries.  */
 static int opt_manual_link = 0;
 
 /* Cache file to use.  */
-static const char *cache_file;
+static char *cache_file;
 
 /* Configuration file.  */
-static const char *config_file;
+static char *config_file;
 
 /* Name and version of program.  */
 static void print_version (FILE *stream, struct argp_state *state);
@@ -221,7 +223,19 @@
       opt_print_cache = 1;
       break;
     case 'r':
-      opt_chroot = arg;
+      {
+	size_t len = strlen (arg);
+	opt_chroot = arg;
+	use_chroot = 1;
+
+	/* Make sure that opt_chroot ends without a slash.  */
+	len = strlen (opt_chroot);
+	while (len && opt_chroot [len - 1] == '/')
+	  {
+	    --len;
+	    opt_chroot [len] = '\0';
+	  }
+      }
       break;
     case 'v':
       opt_verbose = 1;
@@ -512,7 +526,7 @@
   DIR *dir;
   struct dirent *direntry;
   char buf [PATH_MAX];
-  char *soname;
+  char *soname, *buf_ptr;
   struct dlib_entry *dlibs;
   struct dlib_entry *dlib_ptr;
   int nchars;
@@ -529,8 +543,26 @@
       else
 	printf ("%s:\n", entry->path);
     }
+
+  if (use_chroot)
+    buf_ptr = stpncpy (buf, opt_chroot, sizeof (buf));
+  else
+    buf_ptr = buf;
+
+  buf_ptr = stpncpy (buf_ptr, entry->path, sizeof (buf) - (buf_ptr - buf));
+  /* Check for overflow.  */
+  if ((buf_ptr - buf) >= sizeof (buf))
+    {
+      if (use_chroot)
+	error (0, 0, _("Length of directory %s%s is too large -- directory is ignored\n"),
+	       opt_chroot, entry->path);
+      else
+	error (0, 0, _("Length of directory %s is too large -- directory is ignored\n"),
+	       entry->path);
+      return;
+    }
 
-  dir = opendir (entry->path);
+  dir = opendir (buf);
   if (dir == NULL)
     {
       if (opt_verbose)
@@ -558,13 +590,21 @@
 	   || strstr (direntry->d_name, ".so") == NULL)
 	  && !is_hwcap (direntry->d_name))
 	continue;
-      nchars = snprintf (buf, sizeof (buf), "%s/%s", entry->path,
-			 direntry->d_name);
+      if (use_chroot)
+	nchars = snprintf (buf, sizeof (buf), "%s%s/%s", opt_chroot, entry->path,
+			   direntry->d_name);
+      else
+	nchars = snprintf (buf, sizeof (buf), "%s/%s", entry->path,
+			   direntry->d_name);
       /* Check for overflow.  */
       if (nchars >= (int) sizeof (buf))
 	{
-	  error (0, 0, _("buffer for snprintf too small for %s/%s--file is ignored\n"),
-		 entry->path, direntry->d_name);
+	  if (use_chroot)
+	    error (0, 0, _("Length of file %s%s/%s is too large -- file is ignored\n"),
+		   opt_chroot, entry->path, direntry->d_name);
+	  else
+	    error (0, 0, _("Length of file %s/%s is too large -- file is ignored\n"),
+		   entry->path, direntry->d_name);
 	  continue;
 	}
 #ifdef _DIRENT_HAVE_D_TYPE
@@ -582,10 +622,14 @@
 	{
 	  /* Handle subdirectory later.  */
 	  struct dir_entry *new_entry;
+	  char tmp [PATH_MAX];
 
 	  new_entry = xmalloc (sizeof (struct dir_entry));
+	  /* No need to check for overflow.  */
+	  nchars = snprintf (tmp, sizeof (tmp), "%s/%s", entry->path,
+			     direntry->d_name);
 
-	  new_entry->path = buf;
+	  new_entry->path = xstrdup (tmp);
 	  new_entry->flag = entry->flag;
 	  new_entry->next = NULL;
 	  add_single_dir (new_entry, 0);
@@ -761,7 +805,34 @@
   fclose (file);
 }
 
+static char *
+setup_file (const char *file, const char *default_name)
+{
+  char *res, *tmp;
+  int len_chroot = use_chroot ? strlen (opt_chroot) : 0;
 
+  if (file == NULL)
+    {
+      res = xmalloc (len_chroot + strlen (default_name) + 1);
+      tmp = res;
+      if (use_chroot)
+	tmp = stpcpy (tmp, opt_chroot);
+      stpcpy (tmp, default_name);
+    }
+  else
+    {
+      res = xmalloc (len_chroot + strlen (file) + 1);
+
+      tmp = res;
+      if (use_chroot)
+	tmp = stpcpy (tmp, opt_chroot);
+      stpcpy (tmp, file);
+    }
+
+  return res;
+}
+
+
 int
 main (int argc, char **argv)
 {
@@ -779,27 +850,13 @@
 	add_dir (argv [i]);
     }
 
-  if (cache_file == NULL)
-    cache_file = LD_SO_CACHE;
+  cache_file = setup_file (cache_file, LD_SO_CACHE);
+  config_file = setup_file (config_file, LD_SO_CONF);
 
-  if (config_file == NULL)
-    config_file = LD_SO_CONF;
-
-  /* Chroot first.  */
-  if (opt_chroot)
-    {
-      if (chroot (opt_chroot))
-	/* Report failure and exit program.  */
-	error (EXIT_FAILURE, errno, _("Can't chroot to %s"), opt_chroot);
-      /* chroot doesn't change the working directory, let's play safe.  */
-      if (chdir ("/"))
-	error (EXIT_FAILURE, errno, _("Can't chdir to /"));
-    }
-
   if (opt_print_cache)
     {
       print_cache (cache_file);
-      exit (0);
+      goto cleanup;
     }
 
   if (opt_manual_link)
@@ -810,10 +867,9 @@
       for (i = remaining; i < argc; ++i)
 	manual_link (argv [i]);
 
-      exit (0);
+      goto cleanup;
     }
 
-
   if (opt_build_cache)
     init_cache ();
 
@@ -831,6 +887,12 @@
 
   if (opt_build_cache)
     save_cache (cache_file);
+
+  /* Cleanup.  */
+ cleanup:
+
+  free (cache_file);
+  free (config_file);
 
   return 0;
 }

-- 
 Andreas Jaeger
  SuSE Labs aj@suse.de
   private aj@arthur.inka.de
    http://www.suse.de/~aj