From 508270838998f151a82e9c13e7cb8a470a2dc23d Mon Sep 17 00:00:00 2001 From: Javier Martinez Canillas Date: Wed, 24 Feb 2021 15:03:26 +0100 Subject: [PATCH] gdb: Restrict GDB access when locked down The gdbstub* commands allow to start and control a GDB stub running on local host that can be used to connect from a remote debugger. Restrict this functionality when the GRUB is locked down. Signed-off-by: Javier Martinez Canillas Reviewed-by: Daniel Kiper Signed-off-by: Stefan Sørensen --- grub-core/gdb/gdb.c | 32 ++++++++++++++++++-------------- 1 file changed, 18 insertions(+), 14 deletions(-) diff --git a/grub-core/gdb/gdb.c b/grub-core/gdb/gdb.c index 847a1e1..1818cb6 100644 --- a/grub-core/gdb/gdb.c +++ b/grub-core/gdb/gdb.c @@ -75,20 +75,24 @@ static grub_command_t cmd, cmd_stop, cmd_break; GRUB_MOD_INIT (gdb) { grub_gdb_idtinit (); - cmd = grub_register_command ("gdbstub", grub_cmd_gdbstub, - N_("PORT"), - /* TRANSLATORS: GDB stub is a small part of - GDB functionality running on local host - which allows remote debugger to - connect to it. */ - N_("Start GDB stub on given port")); - cmd_break = grub_register_command ("gdbstub_break", grub_cmd_gdb_break, - /* TRANSLATORS: this refers to triggering - a breakpoint so that the user will land - into GDB. */ - 0, N_("Break into GDB")); - cmd_stop = grub_register_command ("gdbstub_stop", grub_cmd_gdbstop, - 0, N_("Stop GDB stub")); + cmd = grub_register_command_lockdown ("gdbstub", grub_cmd_gdbstub, + N_("PORT"), + /* + * TRANSLATORS: GDB stub is a small part of + * GDB functionality running on local host + * which allows remote debugger to + * connect to it. + */ + N_("Start GDB stub on given port")); + cmd_break = grub_register_command_lockdown ("gdbstub_break", grub_cmd_gdb_break, + /* + * TRANSLATORS: this refers to triggering + * a breakpoint so that the user will land + * into GDB. + */ + 0, N_("Break into GDB")); + cmd_stop = grub_register_command_lockdown ("gdbstub_stop", grub_cmd_gdbstop, + 0, N_("Stop GDB stub")); } GRUB_MOD_FINI (gdb) -- 2.14.2