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