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2f822da535
Previously, the prefixname field of struct cmd_list_element was manually
set for prefix commands. This seems verbose and error prone as it
required every single call to functions adding prefix commands to
specify the prefix name while the same information can be easily
generated.
Historically, this was not possible as the prefix field was null for
many commands, but this was fixed in commit
3f4d92ebdf by Philippe Waroquiers, so
we can rely on the prefix field being set when generating the prefix
name.
This commit also fixes a use after free in this scenario:
* A command gets created via Python (using the gdb.Command class).
The prefix name member is dynamically allocated.
* An alias to the new command is created. The alias's prefixname is set
to point to the prefixname for the original command with a direct
assignment.
* A new command with the same name as the Python command is created.
* The object for the original Python command gets freed and its
prefixname gets freed as well.
* The alias is updated to point to the new command, but its prefixname
is not updated so it keeps pointing to the freed one.
gdb/ChangeLog:
* command.h (add_prefix_cmd): Remove the prefixname argument as
it can now be generated automatically. Update all callers.
(add_basic_prefix_cmd): Ditto.
(add_show_prefix_cmd): Ditto.
(add_prefix_cmd_suppress_notification): Ditto.
(add_abbrev_prefix_cmd): Ditto.
* cli/cli-decode.c (add_prefix_cmd): Ditto.
(add_basic_prefix_cmd): Ditto.
(add_show_prefix_cmd): Ditto.
(add_prefix_cmd_suppress_notification): Ditto.
(add_prefix_cmd_suppress_notification): Ditto.
(add_abbrev_prefix_cmd): Ditto.
* cli/cli-decode.h (struct cmd_list_element): Replace the
prefixname member variable with a method which generates the
prefix name at runtime. Update all code reading the prefix
name to use the method, and remove all code setting it.
* python/py-cmd.c (cmdpy_destroyer): Remove code to free the
prefixname member as it's now a method.
(cmdpy_function): Determine if the command is a prefix by
looking at prefixlist, not prefixname.
226 lines
7.7 KiB
C
226 lines
7.7 KiB
C
/* Maintenance commands for testing the settings framework.
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Copyright (C) 2019-2021 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdbcmd.h"
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/* Command list for "maint set test-settings". */
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static cmd_list_element *maintenance_set_test_settings_list;
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/* Command list for "maint show test-settings". */
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static cmd_list_element *maintenance_show_test_settings_list;
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/* Control variables for all the "maintenance set/show test-settings
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xxx" commands. */
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static bool maintenance_test_settings_boolean;
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static auto_boolean maintenance_test_settings_auto_boolean = AUTO_BOOLEAN_AUTO;
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static unsigned int maintenance_test_settings_uinteger;
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static int maintenance_test_settings_integer;
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static int maintenance_test_settings_zinteger;
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static unsigned int maintenance_test_settings_zuinteger;
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static int maintenance_test_settings_zuinteger_unlimited;
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static char *maintenance_test_settings_string;
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static char *maintenance_test_settings_string_noescape;
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static char *maintenance_test_settings_optional_filename;
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static char *maintenance_test_settings_filename;
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/* Enum values for the "maintenance set/show test-settings boolean"
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commands. */
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static const char maintenance_test_settings_xxx[] = "xxx";
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static const char maintenance_test_settings_yyy[] = "yyy";
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static const char maintenance_test_settings_zzz[] = "zzz";
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static const char *const maintenance_test_settings_enums[] = {
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maintenance_test_settings_xxx,
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maintenance_test_settings_yyy,
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maintenance_test_settings_zzz,
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nullptr
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};
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static const char *maintenance_test_settings_enum
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= maintenance_test_settings_xxx;
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/* The "maintenance show test-settings xxx" commands. */
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static void
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maintenance_show_test_settings_value_cmd
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(struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file, (("%s\n")), value);
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}
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void _initialize_maint_test_settings ();
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void
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_initialize_maint_test_settings ()
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{
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maintenance_test_settings_filename = xstrdup ("/foo/bar");
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add_basic_prefix_cmd ("test-settings", class_maintenance,
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_("\
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Set GDB internal variables used for set/show command infrastructure testing."),
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&maintenance_set_test_settings_list,
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0/*allow-unknown*/,
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&maintenance_set_cmdlist);
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add_show_prefix_cmd ("test-settings", class_maintenance,
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_("\
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Show GDB internal variables used for set/show command infrastructure testing."),
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&maintenance_show_test_settings_list,
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0/*allow-unknown*/,
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&maintenance_show_cmdlist);
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add_setshow_boolean_cmd ("boolean", class_maintenance,
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&maintenance_test_settings_boolean, _("\
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command used for internal testing."), _("\
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command used for internal testing."),
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nullptr, /* help_doc */
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nullptr, /* set_cmd */
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maintenance_show_test_settings_value_cmd,
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&maintenance_set_test_settings_list,
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&maintenance_show_test_settings_list);
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add_setshow_auto_boolean_cmd ("auto-boolean", class_maintenance,
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&maintenance_test_settings_auto_boolean, _("\
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command used for internal testing."), _("\
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command used for internal testing."),
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nullptr, /* help_doc */
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nullptr, /* set_cmd */
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maintenance_show_test_settings_value_cmd,
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&maintenance_set_test_settings_list,
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&maintenance_show_test_settings_list);
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add_setshow_uinteger_cmd ("uinteger", class_maintenance,
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&maintenance_test_settings_uinteger, _("\
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command used for internal testing."), _("\
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command used for internal testing."),
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nullptr, /* help_doc */
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nullptr, /* set_cmd */
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maintenance_show_test_settings_value_cmd,
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&maintenance_set_test_settings_list,
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&maintenance_show_test_settings_list);
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add_setshow_integer_cmd ("integer", class_maintenance,
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&maintenance_test_settings_integer, _("\
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command used for internal testing."), _("\
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command used for internal testing."),
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nullptr, /* help_doc */
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nullptr, /* set_cmd */
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maintenance_show_test_settings_value_cmd,
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&maintenance_set_test_settings_list,
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&maintenance_show_test_settings_list);
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add_setshow_string_cmd ("string", class_maintenance,
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&maintenance_test_settings_string, _("\
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command used for internal testing."), _("\
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command used for internal testing."),
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nullptr, /* help_doc */
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nullptr, /* set_cmd */
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maintenance_show_test_settings_value_cmd,
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&maintenance_set_test_settings_list,
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&maintenance_show_test_settings_list);
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add_setshow_string_noescape_cmd
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("string-noescape", class_maintenance,
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&maintenance_test_settings_string_noescape, _("\
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command used for internal testing."), _("\
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command used for internal testing."),
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nullptr, /* help_doc */
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nullptr, /* set_cmd */
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maintenance_show_test_settings_value_cmd,
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&maintenance_set_test_settings_list,
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&maintenance_show_test_settings_list);
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add_setshow_optional_filename_cmd
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("optional-filename", class_maintenance,
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&maintenance_test_settings_optional_filename, _("\
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command used for internal testing."), _("\
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command used for internal testing."),
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nullptr, /* help_doc */
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nullptr, /* set_cmd */
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maintenance_show_test_settings_value_cmd,
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&maintenance_set_test_settings_list,
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&maintenance_show_test_settings_list);
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add_setshow_filename_cmd ("filename", class_maintenance,
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&maintenance_test_settings_filename, _("\
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command used for internal testing."), _("\
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command used for internal testing."),
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nullptr, /* help_doc */
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nullptr, /* set_cmd */
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maintenance_show_test_settings_value_cmd,
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&maintenance_set_test_settings_list,
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&maintenance_show_test_settings_list);
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add_setshow_zinteger_cmd ("zinteger", class_maintenance,
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&maintenance_test_settings_zinteger, _("\
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command used for internal testing."), _("\
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command used for internal testing."),
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nullptr, /* help_doc */
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nullptr, /* set_cmd */
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maintenance_show_test_settings_value_cmd,
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&maintenance_set_test_settings_list,
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&maintenance_show_test_settings_list);
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add_setshow_zuinteger_cmd ("zuinteger", class_maintenance,
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&maintenance_test_settings_zuinteger, _("\
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command used for internal testing."), _("\
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command used for internal testing."),
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nullptr, /* help_doc */
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nullptr, /* set_cmd */
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maintenance_show_test_settings_value_cmd,
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&maintenance_set_test_settings_list,
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&maintenance_show_test_settings_list);
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add_setshow_zuinteger_unlimited_cmd
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("zuinteger-unlimited", class_maintenance,
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&maintenance_test_settings_zuinteger_unlimited, _("\
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command used for internal testing."), _("\
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command used for internal testing."),
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nullptr, /* help_doc */
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nullptr, /* set_cmd */
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maintenance_show_test_settings_value_cmd,
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&maintenance_set_test_settings_list,
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&maintenance_show_test_settings_list);
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add_setshow_enum_cmd ("enum", class_maintenance,
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maintenance_test_settings_enums,
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&maintenance_test_settings_enum, _("\
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command used for internal testing."), _("\
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command used for internal testing."),
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nullptr, /* help_doc */
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nullptr, /* set_cmd */
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maintenance_show_test_settings_value_cmd,
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&maintenance_set_test_settings_list,
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&maintenance_show_test_settings_list);
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}
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