gdb/

New option "set auto-load safe-path".
	* NEWS: New commands "set auto-load safe-path"
	and "show auto-load safe-path".
	* auto-load.c: Include gdb_vecs.h, readline/tilde.h and completer.h.
	(auto_load_safe_path, auto_load_safe_path_vec)
	(auto_load_safe_path_vec_update, set_auto_load_safe_path)
	(show_auto_load_safe_path, add_auto_load_safe_path, filename_is_in_dir)
	(filename_is_in_auto_load_safe_path_vec, file_is_auto_load_safe): New.
	(source_gdb_script_for_objfile): New variable is_safe.  Call
	file_is_auto_load_safe.  Return if it is not.
	(struct loaded_script): New field loaded.
	(maybe_add_script): Add parameter loaded.  Initialize SLOT with it.
	(print_script): Use LOADED indicator instead of FULL_PATH.  Change
	output "Missing" to "No".
	(_initialize_auto_load): New variable cmd.  Initialize
	auto_load_safe_path.  Register "set auto-load safe-path",
	"show auto-load safe-path" and "add-auto-load-safe-path".
	* auto-load.h (maybe_add_script): Add parameter loaded.
	(file_is_auto_load_safe): New declaration.
	* config.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: New parameters --with-auto-load-safe-path
	and --without-auto-load-safe-path.
	* linux-thread-db.c (try_thread_db_load_from_pdir_1)
	(try_thread_db_load_from_dir): Check file_is_auto_load_safe first.
	* main.c (captured_main): Check file_is_auto_load_safe for
	LOCAL_GDBINIT.
	* python/py-auto-load.c (gdbpy_load_auto_script_for_objfile): New
	variable is_safe.  Call file_is_auto_load_safe.  Return if it is not.
	(source_section_scripts): Call file_is_auto_load_safe.  Return if it is
	not.

gdb/doc/
	New option "set auto-load safe-path".
	* gdb.texinfo (Auto-loading): Extend the "show auto-load"
	and "info auto-load" examples for safe-path.  Put there also references
	for "set auto-load safe-path" and "show auto-load safe-path".
	New menu item for Auto-loading safe path.
	(Auto-loading safe path): New node.
	(Python Auto-loading): Update the expected output from "Missing"
	to "No".

gdb/testsuite/
	New option "set auto-load safe-path".
	* gdb.python/py-objfile-script.exp (set auto-load safe-path): New.
	* gdb.python/py-section-script.exp (set auto-load safe-path): New.

gdb/ChangeLog

@@ -1,3 +1,37 @@
+2012-04-17  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	New option "set auto-load safe-path".
+	* NEWS: New commands "set auto-load safe-path"
+	and "show auto-load safe-path".
+	* auto-load.c: Include gdb_vecs.h, readline/tilde.h and completer.h.
+	(auto_load_safe_path, auto_load_safe_path_vec)
+	(auto_load_safe_path_vec_update, set_auto_load_safe_path)
+	(show_auto_load_safe_path, add_auto_load_safe_path, filename_is_in_dir)
+	(filename_is_in_auto_load_safe_path_vec, file_is_auto_load_safe): New.
+	(source_gdb_script_for_objfile): New variable is_safe.  Call
+	file_is_auto_load_safe.  Return if it is not.
+	(struct loaded_script): New field loaded.
+	(maybe_add_script): Add parameter loaded.  Initialize SLOT with it.
+	(print_script): Use LOADED indicator instead of FULL_PATH.  Change
+	output "Missing" to "No".
+	(_initialize_auto_load): New variable cmd.  Initialize
+	auto_load_safe_path.  Register "set auto-load safe-path",
+	"show auto-load safe-path" and "add-auto-load-safe-path".
+	* auto-load.h (maybe_add_script): Add parameter loaded.
+	(file_is_auto_load_safe): New declaration.
+	* config.in: Regenerate.
+	* configure: Regenerate.
+	* configure.ac: New parameters --with-auto-load-safe-path
+	and --without-auto-load-safe-path.
+	* linux-thread-db.c (try_thread_db_load_from_pdir_1)
+	(try_thread_db_load_from_dir): Check file_is_auto_load_safe first.
+	* main.c (captured_main): Check file_is_auto_load_safe for
+	LOCAL_GDBINIT.
+	* python/py-auto-load.c (gdbpy_load_auto_script_for_objfile): New
+	variable is_safe.  Call file_is_auto_load_safe.  Return if it is not.
+	(source_section_scripts): Call file_is_auto_load_safe.  Return if it is
+	not.
+
 2012-04-17  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	auto-load: Implementation.

gdb/NEWS

@@ -154,6 +154,11 @@ set auto-load libthread-db on|off
 show auto-load libthread-db
   Control auto-loading of inferior specific thread debugging shared library.
 
+set auto-load safe-path <dir1>[:<dir2>...]
+show auto-load safe-path
+  Set a list of directories from which it is safe to auto-load files.
+  The delimiter (':' above) may differ according to the host platform.
+
 * New remote packets
 
 z0/z1 conditional breakpoints extension

gdb/auto-load.c

@@ -32,6 +32,9 @@
 #include "gdbcmd.h"
 #include "cli/cli-decode.h"
 #include "cli/cli-setshow.h"
+#include "gdb_vecs.h"
+#include "readline/tilde.h"
+#include "completer.h"
 
 /* The suffix of per-objfile scripts to auto-load as non-Python command files.
    E.g. When the program loads libfoo.so, look for libfoo-gdb.gdb.  */
@@ -90,6 +93,181 @@ show_auto_load_local_gdbinit (struct ui_file *file, int from_tty,
 		    value);
 }
 
+/* Directory list safe to hold auto-loaded files.  It is not checked for
+   absolute paths but they are strongly recommended.  It is initialized by
+   _initialize_auto_load.  */
+static char *auto_load_safe_path;
+
+/* Vector of directory elements of AUTO_LOAD_SAFE_PATH with each one normalized
+   by tilde_expand and possibly each entries has added its gdb_realpath
+   counterpart.  */
+static VEC (char_ptr) *auto_load_safe_path_vec;
+
+/* Update auto_load_safe_path_vec from current AUTO_LOAD_SAFE_PATH.  */
+
+static void
+auto_load_safe_path_vec_update (void)
+{
+  VEC (char_ptr) *dir_vec = NULL;
+  unsigned len;
+  int ix;
+
+  free_char_ptr_vec (auto_load_safe_path_vec);
+
+  auto_load_safe_path_vec = dirnames_to_char_ptr_vec (auto_load_safe_path);
+  len = VEC_length (char_ptr, auto_load_safe_path_vec);
+
+  /* Apply tilde_expand and gdb_realpath to each AUTO_LOAD_SAFE_PATH_VEC
+     element.  */
+  for (ix = 0; ix < len; ix++)
+    {
+      char *dir = VEC_index (char_ptr, auto_load_safe_path_vec, ix);
+      char *expanded = tilde_expand (dir);
+      char *real_path = gdb_realpath (expanded);
+
+      /* Ensure the current entry is at least tilde_expand-ed.  */
+      xfree (dir);
+      VEC_replace (char_ptr, auto_load_safe_path_vec, ix, expanded);
+
+      /* If gdb_realpath returns a different content, append it.  */
+      if (strcmp (real_path, expanded) == 0)
+	xfree (real_path);
+      else
+	VEC_safe_push (char_ptr, auto_load_safe_path_vec, real_path);
+    }
+}
+
+/* "set" command for the auto_load_safe_path configuration variable.  */
+
+static void
+set_auto_load_safe_path (char *args, int from_tty, struct cmd_list_element *c)
+{
+  auto_load_safe_path_vec_update ();
+}
+
+/* "show" command for the auto_load_safe_path configuration variable.  */
+
+static void
+show_auto_load_safe_path (struct ui_file *file, int from_tty,
+			  struct cmd_list_element *c, const char *value)
+{
+  if (*value == 0)
+    fprintf_filtered (file, _("Auto-load files are safe to load from any "
+			      "directory.\n"));
+  else
+    fprintf_filtered (file, _("List of directories from which it is safe to "
+			      "auto-load files is %s.\n"),
+		      value);
+}
+
+/* "add-auto-load-safe-path" command for the auto_load_safe_path configuration
+   variable.  */
+
+static void
+add_auto_load_safe_path (char *args, int from_tty)
+{
+  char *s;
+
+  if (args == NULL || *args == 0)
+    error (_("\
+Adding empty directory element disables the auto-load safe-path security.  \
+Use 'set auto-load safe-path' instead if you mean that."));
+
+  s = xstrprintf ("%s%c%s", auto_load_safe_path, DIRNAME_SEPARATOR, args);
+  xfree (auto_load_safe_path);
+  auto_load_safe_path = s;
+
+  auto_load_safe_path_vec_update ();
+}
+
+/* Return 1 if FILENAME is equal to DIR or if FILENAME belongs to the
+   subdirectory DIR.  Return 0 otherwise.  gdb_realpath normalization is never
+   done here.  */
+
+static ATTRIBUTE_PURE int
+filename_is_in_dir (const char *filename, const char *dir)
+{
+  size_t dir_len = strlen (dir);
+
+  while (dir_len && IS_DIR_SEPARATOR (dir[dir_len - 1]))
+    dir_len--;
+
+  return (filename_ncmp (dir, filename, dir_len) == 0
+	  && (IS_DIR_SEPARATOR (filename[dir_len])
+	      || filename[dir_len] == '\0'));
+}
+
+/* Return 1 if FILENAME belongs to one of directory components of
+   AUTO_LOAD_SAFE_PATH_VEC.  Return 0 otherwise.
+   auto_load_safe_path_vec_update is never called.
+   *FILENAME_REALP may be updated by gdb_realpath of FILENAME - it has to be
+   freed by the caller.  */
+
+static int
+filename_is_in_auto_load_safe_path_vec (const char *filename,
+					char **filename_realp)
+{
+  char *dir;
+  int ix;
+
+  for (ix = 0; VEC_iterate (char_ptr, auto_load_safe_path_vec, ix, dir); ++ix)
+    if (*filename_realp == NULL && filename_is_in_dir (filename, dir))
+      break;
+  
+  if (dir == NULL)
+    {
+      if (*filename_realp == NULL)
+	*filename_realp = gdb_realpath (filename);
+
+      for (ix = 0; VEC_iterate (char_ptr, auto_load_safe_path_vec, ix, dir);
+	   ++ix)
+	if (filename_is_in_dir (*filename_realp, dir))
+	  break;
+    }
+
+  if (dir != NULL)
+    return 1;
+
+  return 0;
+}
+
+/* Return 1 if FILENAME is located in one of the directories of
+   AUTO_LOAD_SAFE_PATH.  Otherwise call warning and return 0.  FILENAME does
+   not have to be an absolute path.
+
+   Existence of FILENAME is not checked.  Function will still give a warning
+   even if the caller would quietly skip non-existing file in unsafe
+   directory.  */
+
+int
+file_is_auto_load_safe (const char *filename)
+{
+  char *filename_real = NULL;
+  struct cleanup *back_to;
+
+  back_to = make_cleanup (free_current_contents, &filename_real);
+
+  if (filename_is_in_auto_load_safe_path_vec (filename, &filename_real))
+    {
+      do_cleanups (back_to);
+      return 1;
+    }
+
+  auto_load_safe_path_vec_update ();
+  if (filename_is_in_auto_load_safe_path_vec (filename, &filename_real))
+    {
+      do_cleanups (back_to);
+      return 1;
+    }
+
+  warning (_("File \"%s\" auto-loading has been declined by your "
+	     "`auto-load safe-path' set to \"%s\"."),
+	   filename_real, auto_load_safe_path);
+
+  do_cleanups (back_to);
+  return 0;
+}
+
 /* Definition of script language for GDB canned sequences of commands.  */
 
 static const struct script_language script_language_gdb
@@ -99,13 +277,20 @@ static void
 source_gdb_script_for_objfile (struct objfile *objfile, FILE *file,
 			       const char *filename)
 {
+  int is_safe;
   struct auto_load_pspace_info *pspace_info;
   volatile struct gdb_exception e;
 
+  is_safe = file_is_auto_load_safe (filename);
+
   /* Add this script to the hash table too so "info auto-load gdb-scripts"
      can print it.  */
   pspace_info = get_auto_load_pspace_data_for_loading (current_program_space);
-  maybe_add_script (pspace_info, filename, filename, &script_language_gdb);
+  maybe_add_script (pspace_info, is_safe, filename, filename,
+		    &script_language_gdb);
+
+  if (!is_safe)
+    return;
 
   TRY_CATCH (e, RETURN_MASK_ALL)
     {
@@ -140,6 +325,9 @@ struct loaded_script
      inaccessible).  */
   const char *full_path;
 
+  /* Non-zero if this script has been loaded.  */
+  int loaded;
+
   const struct script_language *language;
 };
 
@@ -232,12 +420,13 @@ get_auto_load_pspace_data_for_loading (struct program_space *pspace)
   return info;
 }
 
-/* Add script NAME in LANGUAGE to hash table of PSPACE_INFO.
+/* Add script NAME in LANGUAGE to hash table of PSPACE_INFO.  LOADED 1 if the
-   FULL_PATH is NULL if the script wasn't found.  The result is
+   script has been (is going to) be loaded, 0 otherwise (such as if it has not
+   been found).  FULL_PATH is NULL if the script wasn't found.  The result is
    true if the script was already in the hash table.  */
 
 int
-maybe_add_script (struct auto_load_pspace_info *pspace_info,
+maybe_add_script (struct auto_load_pspace_info *pspace_info, int loaded,
 		  const char *name, const char *full_path,
 		  const struct script_language *language)
 {
@@ -271,6 +460,7 @@ maybe_add_script (struct auto_load_pspace_info *pspace_info,
 	}
       else
 	(*slot)->full_path = NULL;
+      (*slot)->loaded = loaded;
       (*slot)->language = language;
     }
 
@@ -432,7 +622,7 @@ print_script (struct loaded_script *script)
 
   chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 
-  ui_out_field_string (uiout, "loaded", script->full_path ? "Yes" : "Missing");
+  ui_out_field_string (uiout, "loaded", script->loaded ? "Yes" : "No");
   ui_out_field_string (uiout, "script", script->name);
   ui_out_text (uiout, "\n");
 
@@ -718,6 +908,8 @@ void _initialize_auto_load (void);
 void
 _initialize_auto_load (void)
 {
+  struct cmd_list_element *cmd;
+
   auto_load_pspace_data
     = register_program_space_data_with_cleanup (auto_load_pspace_data_cleanup);
 
@@ -757,4 +949,30 @@ This options has security implications for untrusted inferiors."),
 	   _("Print whether current directory .gdbinit file has been loaded.\n\
 Usage: info auto-load local-gdbinit"),
 	   auto_load_info_cmdlist_get ());
+
+  auto_load_safe_path = xstrdup (DEFAULT_AUTO_LOAD_SAFE_PATH);
+  auto_load_safe_path_vec_update ();
+  add_setshow_optional_filename_cmd ("safe-path", class_support,
+				     &auto_load_safe_path, _("\
+Set the list of directories from which it is safe to auto-load files."), _("\
+Show the list of directories from which it is safe to auto-load files."), _("\
+Various files loaded automatically for the 'set auto-load ...' options must\n\
+be located in one of the directories listed by this option.  Warning will be\n\
+printed and file will not be used otherwise.  Use empty string (or even\n\
+empty directory entry) to allow any file for the 'set auto-load ...' options.\n\
+This option is ignored for the kinds of files having 'set auto-load ... off'.\n\
+This options has security implications for untrusted inferiors."),
+				     set_auto_load_safe_path,
+				     show_auto_load_safe_path,
+				     auto_load_set_cmdlist_get (),
+				     auto_load_show_cmdlist_get ());
+
+  cmd = add_cmd ("add-auto-load-safe-path", class_support,
+		 add_auto_load_safe_path,
+		 _("Add entries to the list of directories from which it is safe "
+		   "to auto-load files.\n\
+See the commands 'set auto-load safe-path' and 'show auto-load safe-path' to\n\
+access the current full list setting."),
+		 &cmdlist);
+  set_cmd_completer (cmd, filename_completer);
 }

gdb/auto-load.h

@@ -39,7 +39,8 @@ extern int auto_load_local_gdbinit_loaded;
 extern struct auto_load_pspace_info *
   get_auto_load_pspace_data_for_loading (struct program_space *pspace);
 extern int maybe_add_script (struct auto_load_pspace_info *pspace_info,
-			     const char *name, const char *full_path,
+			     int loaded, const char *name,
+			     const char *full_path,
 			     const struct script_language *language);
 extern void auto_load_objfile_script (struct objfile *objfile,
 				      const struct script_language *language);
@@ -54,4 +55,6 @@ extern struct cmd_list_element **auto_load_set_cmdlist_get (void);
 extern struct cmd_list_element **auto_load_show_cmdlist_get (void);
 extern struct cmd_list_element **auto_load_info_cmdlist_get (void);
 
+extern int file_is_auto_load_safe (const char *filename);
+
 #endif /* AUTO_LOAD_H */

gdb/config.in

@@ -43,6 +43,9 @@
    moved. */
 #undef DEBUGDIR_RELOCATABLE
 
+/* Directories safe to hold auto-loaded files. */
+#undef DEFAULT_AUTO_LOAD_SAFE_PATH
+
 /* Define to BFD's default architecture. */
 #undef DEFAULT_BFD_ARCH
 

gdb/configure

@@ -967,6 +967,7 @@ enable_dependency_tracking
 with_separate_debug_dir
 with_gdb_datadir
 with_relocated_sources
+with_auto_load_safe_path
 enable_targets
 enable_64_bit_bfd
 enable_gdbcli
@@ -1675,6 +1676,10 @@ Optional Packages:
                           [DATADIR/gdb]
   --with-relocated-sources=PATH
                           automatically relocate this path for source files
+  --with-auto-load-safe-path=PATH
+                          directories safe to hold auto-loaded files
+  --without-auto-load-safe-path
+                          do not restrict auto-loaded files locations
   --with-libunwind-ia64   use libunwind frame unwinding for ia64 targets
   --with-curses           use the curses library instead of the termcap
                           library
@@ -9336,6 +9341,32 @@ _ACEOF
 fi
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for default auto-load safe-path" >&5
+$as_echo_n "checking for default auto-load safe-path... " >&6; }
+
+# Check whether --with-auto-load-safe-path was given.
+if test "${with_auto_load_safe_path+set}" = set; then :
+  withval=$with_auto_load_safe_path; if test "$with_auto_load_safe_path" = "no"; then
+   with_auto_load_safe_path=""
+ fi
+else
+  with_auto_load_safe_path="$prefix"
+fi
+
+
+  test "x$prefix" = xNONE && prefix="$ac_default_prefix"
+  test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
+  ac_define_dir=`eval echo $with_auto_load_safe_path`
+  ac_define_dir=`eval echo $ac_define_dir`
+
+cat >>confdefs.h <<_ACEOF
+#define DEFAULT_AUTO_LOAD_SAFE_PATH "$ac_define_dir"
+_ACEOF
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_auto_load_safe_path" >&5
+$as_echo "$with_auto_load_safe_path" >&6; }
+
 
 
 subdirs="$subdirs testsuite"

gdb/configure.ac

@@ -134,6 +134,18 @@ AS_HELP_STRING([--with-relocated-sources=PATH], [automatically relocate this pat
               [Relocated directory for source files. ])
 ])
 
+AC_MSG_CHECKING([for default auto-load safe-path])
+AC_ARG_WITH(auto-load-safe-path,
+AS_HELP_STRING([--with-auto-load-safe-path=PATH], [directories safe to hold auto-loaded files])
+AS_HELP_STRING([--without-auto-load-safe-path], [do not restrict auto-loaded files locations]),
+[if test "$with_auto_load_safe_path" = "no"; then
+   with_auto_load_safe_path=""
+ fi],
+[with_auto_load_safe_path="$prefix"])
+AC_DEFINE_DIR(DEFAULT_AUTO_LOAD_SAFE_PATH, with_auto_load_safe_path,
+	      [Directories safe to hold auto-loaded files.])
+AC_MSG_RESULT([$with_auto_load_safe_path])
+
 AC_CONFIG_SUBDIRS(testsuite)
 
 # Check whether to support alternative target configurations

gdb/doc/ChangeLog

@@ -1,3 +1,14 @@
+2012-04-17  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	New option "set auto-load safe-path".
+	* gdb.texinfo (Auto-loading): Extend the "show auto-load"
+	and "info auto-load" examples for safe-path.  Put there also references
+	for "set auto-load safe-path" and "show auto-load safe-path".
+	New menu item for Auto-loading safe path.
+	(Auto-loading safe path): New node.
+	(Python Auto-loading): Update the expected output from "Missing"
+	to "No".
+
 2012-04-17  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	auto-load: Implementation.

gdb/doc/gdb.texinfo

@@ -20892,6 +20892,8 @@ gdb-scripts:  Auto-loading of canned sequences of commands scripts is on.
 libthread-db:  Auto-loading of inferior specific libthread_db is on.
 local-gdbinit:  Auto-loading of .gdbinit script from current directory is on.
 python-scripts:  Auto-loading of Python scripts is on.
+safe-path:  List of directories from which it is safe to auto-load files
+            is /usr/local.
 @end smallexample
 
 @anchor{info auto-load}
@@ -20963,12 +20965,19 @@ These are @value{GDBN} control commands for the auto-loading:
 @tab Show setting of thread debugging library.
 @item @xref{info auto-load libthread-db}.
 @tab Show state of thread debugging library.
+@item @xref{set auto-load safe-path}.
+@tab Control directories trusted for automatic loading.
+@item @xref{show auto-load safe-path}.
+@tab Show directories trusted for automatic loading.
+@item @xref{add-auto-load-safe-path}.
+@tab Add directory trusted for automatic loading.
 @end multitable
 
 @menu
 * Init File in the Current Directory:: @samp{set/show/info auto-load local-gdbinit}
 * libthread_db.so.1 file::             @samp{set/show/info auto-load libthread-db}
 * objfile-gdb.gdb file::               @samp{set/show/info auto-load gdb-script}
+* Auto-loading safe path::             @samp{set/show/info auto-load safe-path}
 @xref{Python Auto-loading}.
 @end menu
 
@@ -21069,6 +21078,104 @@ auto-loaded.
 If @var{regexp} is supplied only canned sequences of commands scripts with
 matching names are printed.
 
+@node Auto-loading safe path
+@subsection Security restriction for auto-loading
+@cindex auto-loading safe-path
+
+As the files of inferior can come from untrusted source (such as submitted by
+an application user) @value{GDBN} does not always load any files automatically.
+@value{GDBN} provides the @samp{set auto-load safe-path} setting to list
+directories trusted for loading files not explicitly requested by user.
+
+If the path is not set properly you will see a warning and the file will not
+get loaded:
+
+@smallexample
+$ ./gdb -q ./gdb
+Reading symbols from /home/user/gdb/gdb...done.
+warning: File "/home/user/gdb/gdb-gdb.gdb" auto-loading has been
+         declined by your `auto-load safe-path' set to "/usr/local".
+warning: File "/home/user/gdb/gdb-gdb.py" auto-loading has been
+         declined by your `auto-load safe-path' set to "/usr/local".
+@end smallexample
+
+The list of trusted directories is controlled by the following commands:
+
+@table @code
+@anchor{set auto-load safe-path}
+@kindex set auto-load safe-path
+@item set auto-load safe-path @var{directories}
+Set the list of directories (and their subdirectories) trusted for automatic
+loading and execution of scripts.  You can also enter a specific trusted file.
+The list of directories uses directory separator (@samp{:} on GNU and Unix
+systems, @samp{;} on MS-Windows and MS-DOS) to separate directories, similarly
+to the @env{PATH} environment variable.
+
+@anchor{show auto-load safe-path}
+@kindex show auto-load safe-path
+@item show auto-load safe-path
+Show the list of directories trusted for automatic loading and execution of
+scripts.
+
+@anchor{add-auto-load-safe-path}
+@kindex add-auto-load-safe-path
+@item add-auto-load-safe-path
+Add an entry (or list of entries) the list of directories trusted for automatic
+loading and execution of scripts.  Multiple entries may be delimited by the
+host platform directory separator in use.
+@end table
+
+Setting this variable to an empty string disables this security protection.
+This variable is supposed to be set to the system directories writable by the
+system superuser only.  Users can add their source directories in init files in
+their home directories (@pxref{Home Directory Init File}).  See also deprecated
+init file in the current directory
+(@pxref{Init File in the Current Directory during Startup}).
+
+To force @value{GDBN} to load the files it declined to load in the previous
+example, you could use one of the following ways:
+
+@itemize @bullet
+@item ~/.gdbinit: add-auto-load-safe-path ~/src/gdb
+Specify this trusted directory (or a file) as additional component of the list.
+You have to specify also any existing directories displayed by
+by @samp{show auto-load safe-path} (such as @samp{/usr:/bin} in this example).
+
+@item @kbd{gdb -iex "set auto-load safe-path /usr:/bin:~/src/gdb" [@dots{}]}
+Specify this directory as in the previous case but just for a single
+@value{GDBN} session.
+
+@item @kbd{gdb -iex "set auto-load safe-path" [@dots{}]}
+Disable auto-loading safety for a single @value{GDBN} session.
+This assumes all the files you debug during this @value{GDBN} session will come
+from trusted sources.
+
+@item @kbd{./configure --without-auto-load-safe-path}
+During compilation of @value{GDBN} you may disable any auto-loading safety.
+This assumes all the files you will ever debug with this @value{GDBN} come from
+trusted sources.
+@end itemize
+
+On the other hand you can also explicitly forbid automatic files loading which
+also suppresses any such warning messages:
+
+@itemize @bullet
+@item @kbd{gdb -iex "set auto-load no" [@dots{}]}
+You can use @value{GDBN} command-line option for a single @value{GDBN} session.
+
+@item @samp{~/.gdbinit}: @samp{set auto-load no}
+Disable auto-loading globally for the user
+(@pxref{Home Directory Init File}).  While it is improbable, you could also
+use system init file instead (@pxref{System-wide configuration}).
+@end itemize
+
+This setting applies to the file names as entered by user.  If no entry matches
+@value{GDBN} tries as a last resort to also resolve all the file names into
+their canonical form (typically resolving symbolic links) and compare the
+entries again.  @value{GDBN} already canonicalizes most of the filenames on its
+own before starting the comparison so a canonical form of directories is
+recommended to be entered.
+
 @node Messages/Warnings
 @section Optional Warnings and Messages
 
@@ -25138,7 +25245,7 @@ Example:
 Loaded Script
 Yes    py-section-script.py
        full name: /tmp/py-section-script.py
-Missing my-foo-pretty-printers.py
+No     my-foo-pretty-printers.py
 @end smallexample
 @end table
 

gdb/linux-thread-db.c

@@ -869,6 +869,10 @@ try_thread_db_load_from_pdir_1 (struct objfile *obj)
   /* This should at minimum hit the first character.  */
   gdb_assert (cp != NULL);
   strcpy (cp + 1, LIBTHREAD_DB_SO);
+
+  if (!file_is_auto_load_safe (path))
+    result = 0;
+  else
     result = try_thread_db_load (path);
 
   do_cleanups (cleanup);
@@ -935,6 +939,10 @@ try_thread_db_load_from_dir (const char *dir, size_t dir_len)
   memcpy (path, dir, dir_len);
   path[dir_len] = '/';
   strcpy (path + dir_len + 1, LIBTHREAD_DB_SO);
+
+  if (!file_is_auto_load_safe (path))
+    result = 0;
+  else
     result = try_thread_db_load (path);
 
   do_cleanups (cleanup);

gdb/main.c

@@ -944,7 +944,8 @@ captured_main (void *data)
     {
       auto_load_local_gdbinit_pathname = gdb_realpath (local_gdbinit);
 
-      if (!inhibit_gdbinit && auto_load_local_gdbinit)
+      if (!inhibit_gdbinit && auto_load_local_gdbinit
+	  && file_is_auto_load_safe (local_gdbinit))
 	{
 	  auto_load_local_gdbinit_loaded = 1;
 

gdb/python/py-auto-load.c

@@ -72,13 +72,18 @@ static void
 gdbpy_load_auto_script_for_objfile (struct objfile *objfile, FILE *file,
 				    const char *filename)
 {
+  int is_safe;
   struct auto_load_pspace_info *pspace_info;
 
+  is_safe = file_is_auto_load_safe (filename);
+
   /* Add this script to the hash table too so "info auto-load python-scripts"
      can print it.  */
   pspace_info = get_auto_load_pspace_data_for_loading (current_program_space);
-  maybe_add_script (pspace_info, filename, filename, &script_language_python);
+  maybe_add_script (pspace_info, is_safe, filename, filename,
+		    &script_language_python);
 
+  if (is_safe)
     source_python_script_for_objfile (objfile, file, filename);
 }
 
@@ -147,6 +152,9 @@ source_section_scripts (struct objfile *objfile, const char *source_name,
 	{
 	  make_cleanup_fclose (stream);
 	  make_cleanup (xfree, full_path);
+
+	  if (!file_is_auto_load_safe (full_path))
+	    opened = 0;
 	}
       else
 	{
@@ -167,7 +175,7 @@ Use `info auto-load python [REGEXP]' to list them."),
 
 	 IWBN if complaints.c were more general-purpose.  */
 
-      in_hash_table = maybe_add_script (pspace_info, file, full_path,
+      in_hash_table = maybe_add_script (pspace_info, opened, file, full_path,
 					&script_language_python);
 
       /* If this file is not currently loaded, load it.  */

gdb/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2012-04-17  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	New option "set auto-load safe-path".
+	* gdb.python/py-objfile-script.exp (set auto-load safe-path): New.
+	* gdb.python/py-section-script.exp (set auto-load safe-path): New.
+
 2012-04-17  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	auto-load: Implementation.

gdb/testsuite/gdb.python/py-objfile-script.exp

@@ -37,6 +37,7 @@ if { [skip_python_tests] } { continue }
 set remote_python_file [remote_download host ${srcdir}/${subdir}/${testfile}-gdb.py.in ${subdir}/${testfile}-gdb.py]
 
 gdb_reinitialize_dir $srcdir/$subdir
+gdb_test_no_output "set auto-load safe-path ${remote_python_file}" "set auto-load safe-path"
 gdb_load ${binfile}
 
 # Verify gdb loaded the script.

gdb/testsuite/gdb.python/py-section-script.exp

@@ -49,6 +49,7 @@ if { [skip_python_tests] } { continue }
 set remote_python_file [remote_download host ${srcdir}/${subdir}/${testfile}.py]
 
 gdb_reinitialize_dir $srcdir/$subdir
+gdb_test_no_output "set auto-load safe-path ${remote_python_file}" "set auto-load safe-path"
 gdb_load ${binfile}
 
 # Verify gdb loaded the script.