[kernel-hardening] [RFC 5/7] cpu: mark ro_mostly_after_init for cpuhp_ap/bp_states

Hoeun Ryu
2017-02-19T10:04:08Z

It would be good that `__ro_mostly_after_init` is marked to cpuhp state
objects. They can not be simply marked as `__ro_after_init` because they
should be writable during module_init/exit. Now that they can be read-only
except during module_init/exit

Signed-off-by: Hoeun Ryu <hoeun.ryu@gmail.com>
---
kernel/cpu.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 0a5f630..12ad4c2 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1126,7 +1126,7 @@ core_initcall(cpu_hotplug_pm_sync_init);
#endif /* CONFIG_SMP */

/* Boot processor state steps */
-static struct cpuhp_step cpuhp_bp_states[] = {
+static struct cpuhp_step cpuhp_bp_states[] __ro_mostly_after_init = {
[CPUHP_OFFLINE] = {
.name = "offline",
.startup.single = NULL,
@@ -1212,7 +1212,7 @@ static struct cpuhp_step cpuhp_bp_states[] = {
};

/* Application processor state steps */
-static struct cpuhp_step cpuhp_ap_states[] = {
+static struct cpuhp_step cpuhp_ap_states[] __ro_mostly_after_init = {
#ifdef CONFIG_SMP
/* Final state before CPU kills itself */
[CPUHP_AP_IDLE_DEAD] = {
--
2.7.4