stackprotector: add boot_init_stack_canary()

add the boot_init_stack_canary() and make the secondary idle threads
use it.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 2 insertions, 4 deletions

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index d4c7ac7aa430..5107cb214c7b 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -147,7 +147,6 @@ void cpu_idle(void)
 {
         current_thread_info()->status |= TS_POLLING;
 
-#ifdef CONFIG_CC_STACKPROTECTOR
         /*
          * If we're the non-boot CPU, nothing set the PDA stack
          * canary up for us - and if we are the boot CPU we have
@@ -156,9 +155,8 @@ void cpu_idle(void)
          * invalid canaries already on the stack wont ever
          * trigger):
          */
-        current->stack_canary = get_random_int();
-        write_pda(stack_canary, current->stack_canary);
-#endif
+        boot_init_stack_canary();
+
         /* endless idle loop with no priority at all */
         while (1) {
                 tick_nohz_stop_sched_tick();