Given the following code containing errors, provide Common Weakness Enumeration (CWE) identifiers and corresponding messages in JSON format. Each identified weakness should have a unique entry in the JSON array.
    Code: static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs,
		int exception_state)
{
	unsigned long flags;
	int sstep_tries = 100;
	int error;
	int cpu;
	int trace_on = 0;
	int online_cpus = num_online_cpus();
	u64 time_left;

	kgdb_info[ks->cpu].enter_kgdb++;
	kgdb_info[ks->cpu].exception_state |= exception_state;

	if (exception_state == DCPU_WANT_MASTER)
		atomic_inc(&masters_in_kgdb);
	else
		atomic_inc(&slaves_in_kgdb);

	if (arch_kgdb_ops.disable_hw_break)
		arch_kgdb_ops.disable_hw_break(regs);

acquirelock:
	rcu_read_lock();
	/*
	 * Interrupts will be restored by the 'trap return' code, except when
	 * single stepping.
	 */
	local_irq_save(flags);

	cpu = ks->cpu;
	kgdb_info[cpu].debuggerinfo = regs;
	kgdb_info[cpu].task = current;
	kgdb_info[cpu].ret_state = 0;
	kgdb_info[cpu].irq_depth = hardirq_count() >> HARDIRQ_SHIFT;

	/* Make sure the above info reaches the primary CPU */
	smp_mb();

	if (exception_level == 1) {
		if (raw_spin_trylock(&dbg_master_lock))
			atomic_xchg(&kgdb_active, cpu);
		goto cpu_master_loop;
	}

	/*
	 * CPU will loop if it is a slave or request to become a kgdb
	 * master cpu and acquire the kgdb_active lock:
	 */
	while (1) {
cpu_loop:
		if (kgdb_info[cpu].exception_state & DCPU_NEXT_MASTER) {
			kgdb_info[cpu].exception_state &= ~DCPU_NEXT_MASTER;
			goto cpu_master_loop;
		} else if (kgdb_info[cpu].exception_state & DCPU_WANT_MASTER) {
			if (raw_spin_trylock(&dbg_master_lock)) {
				atomic_xchg(&kgdb_active, cpu);
				break;
			}
		} else if (kgdb_info[cpu].exception_state & DCPU_WANT_BT) {
			dump_stack();
			kgdb_info[cpu].exception_state &= ~DCPU_WANT_BT;
		} else if (kgdb_info[cpu].exception_state & DCPU_IS_SLAVE) {
			if (!raw_spin_is_locked(&dbg_slave_lock))
				goto return_normal;
		} else {
return_normal:
			/* Return to normal operation by executing any
			 * hw breakpoint fixup.
			 */
			if (arch_kgdb_ops.correct_hw_break)
				arch_kgdb_ops.correct_hw_break();
			if (trace_on)
				tracing_on();
			kgdb_info[cpu].debuggerinfo = NULL;
			kgdb_info[cpu].task = NULL;
			kgdb_info[cpu].exception_state &=
				~(DCPU_WANT_MASTER | DCPU_IS_SLAVE);
			kgdb_info[cpu].enter_kgdb--;
			smp_mb__before_atomic();
			atomic_dec(&slaves_in_kgdb);
			dbg_touch_watchdogs();
			local_irq_restore(flags);
			rcu_read_unlock();
			return 0;
		}
		cpu_relax();
	}

	/*
	 * For single stepping, try to only enter on the processor
	 * that was single stepping.  To guard against a deadlock, the
	 * kernel will only try for the value of sstep_tries before
	 * giving up and continuing on.
	 */
	if (atomic_read(&kgdb_cpu_doing_single_step) != -1 &&
	    (kgdb_info[cpu].task &&
	     kgdb_info[cpu].task->pid != kgdb_sstep_pid) && --sstep_tries) {
		atomic_set(&kgdb_active, -1);
		raw_spin_unlock(&dbg_master_lock);
		dbg_touch_watchdogs();
		local_irq_restore(flags);
		rcu_read_unlock();

		goto acquirelock;
	}

	if (!kgdb_io_ready(1)) {
		kgdb_info[cpu].ret_state = 1;
		goto kgdb_restore; /* No I/O connection, resume the system */
	}

	/*
	 * Don't enter if we have hit a removed breakpoint.
	 */
	if (kgdb_skipexception(ks->ex_vector, ks->linux_regs))
		goto kgdb_restore;

	atomic_inc(&ignore_console_lock_warning);

	/* Call the I/O driver's pre_exception routine */
	if (dbg_io_ops->pre_exception)
		dbg_io_ops->pre_exception();

	/*
	 * Get the passive CPU lock which will hold all the non-primary
	 * CPU in a spin state while the debugger is active
	 */
	if (!kgdb_single_step)
		raw_spin_lock(&dbg_slave_lock);

#ifdef CONFIG_SMP
	/* If send_ready set, slaves are already waiting */
	if (ks->send_ready)
		atomic_set(ks->send_ready, 1);

	/* Signal the other CPUs to enter kgdb_wait() */
	else if ((!kgdb_single_step) && kgdb_do_roundup)
		kgdb_roundup_cpus();
#endif

	/*
	 * Wait for the other CPUs to be notified and be waiting for us:
	 */
	time_left = MSEC_PER_SEC;
	while (kgdb_do_roundup && --time_left &&
	       (atomic_read(&masters_in_kgdb) + atomic_read(&slaves_in_kgdb)) !=
		   online_cpus)
		udelay(1000);
	if (!time_left)
		pr_crit("Timed out waiting for secondary CPUs.\n");

	/*
	 * At this point the primary processor is completely
	 * in the debugger and all secondary CPUs are quiescent
	 */
	dbg_deactivate_sw_breakpoints();
	kgdb_single_step = 0;
	kgdb_contthread = current;
	exception_level = 0;
	trace_on = tracing_is_on();
	if (trace_on)
		tracing_off();

	while (1) {
cpu_master_loop:
		if (dbg_kdb_mode) {
			kgdb_connected = 1;
			error = kdb_stub(ks);
			if (error == -1)
				continue;
			kgdb_connected = 0;
		} else {
			error = gdb_serial_stub(ks);
		}

		if (error == DBG_PASS_EVENT) {
			dbg_kdb_mode = !dbg_kdb_mode;
		} else if (error == DBG_SWITCH_CPU_EVENT) {
			kgdb_info[dbg_switch_cpu].exception_state |=
				DCPU_NEXT_MASTER;
			goto cpu_loop;
		} else {
			kgdb_info[cpu].ret_state = error;
			break;
		}
	}

	dbg_activate_sw_breakpoints();

	/* Call the I/O driver's post_exception routine */
	if (dbg_io_ops->post_exception)
		dbg_io_ops->post_exception();

	atomic_dec(&ignore_console_lock_warning);

	if (!kgdb_single_step) {
		raw_spin_unlock(&dbg_slave_lock);
		/* Wait till all the CPUs have quit from the debugger. */
		while (kgdb_do_roundup && atomic_read(&slaves_in_kgdb))
			cpu_relax();
	}

kgdb_restore:
	if (atomic_read(&kgdb_cpu_doing_single_step) != -1) {
		int sstep_cpu = atomic_read(&kgdb_cpu_doing_single_step);
		if (kgdb_info[sstep_cpu].task)
			kgdb_sstep_pid = kgdb_info[sstep_cpu].task->pid;
		else
			kgdb_sstep_pid = 0;
	}
	if (arch_kgdb_ops.correct_hw_break)
		arch_kgdb_ops.correct_hw_break();
	if (trace_on)
		tracing_on();

	kgdb_info[cpu].debuggerinfo = NULL;
	kgdb_info[cpu].task = NULL;
	kgdb_info[cpu].exception_state &=
		~(DCPU_WANT_MASTER | DCPU_IS_SLAVE);
	kgdb_info[cpu].enter_kgdb--;
	smp_mb__before_atomic();
	atomic_dec(&masters_in_kgdb);
	/* Free kgdb_active */
	atomic_set(&kgdb_active, -1);
	raw_spin_unlock(&dbg_master_lock);
	dbg_touch_watchdogs();
	local_irq_restore(flags);
	rcu_read_unlock();

	return kgdb_info[cpu].ret_state;
} ; Sample JSON Format Confermily Expected output: "examples" => "cwe": "xxx"; "message": "xxx"
    
 'cwe': ['CWE-787'], 'message': 'lockdown: also lock down previous kgdb use

KGDB and KDB allow read and write access to kernel memory, and thus
should be restricted during lockdown.  An attacker with access to a
serial port (for example, via a hypervisor console, which some cloud
vendors provide over the network) could trigger the debugger so it is
important that the debugger respect the lockdown mode when/if it is
triggered.

Fix this by integrating lockdown into kdb's existing permissions
mechanism.  Unfortunately kgdb does not have any permissions mechanism
(although it certainly could be added later) so, for now, kgdb is simply
and brutally disabled by immediately exiting the gdb stub without taking
any action.

For lockdowns established early in the boot (e.g. the normal case) then
this should be fine but on systems where kgdb has set breakpoints before
the lockdown is enacted than "bad things" will happen.

CVE: CVE-2022-21499
Co-developed-by: Stephen Brennan <stephen.s.brennan@oracle.com>
Signed-off-by: Stephen Brennan <stephen.s.brennan@oracle.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>'