diff options
| -rw-r--r-- | arch/x86/kernel/process_64.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 9e69e223023e..d4c7ac7aa430 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -150,9 +150,13 @@ void cpu_idle(void) #ifdef CONFIG_CC_STACKPROTECTOR /* * If we're the non-boot CPU, nothing set the PDA stack - * canary up for us. This is as good a place as any for - * doing that. + * canary up for us - and if we are the boot CPU we have + * a 0 stack canary. This is a good place for updating + * it, as we wont ever return from this function (so the + * invalid canaries already on the stack wont ever + * trigger): */ + current->stack_canary = get_random_int(); write_pda(stack_canary, current->stack_canary); #endif /* endless idle loop with no priority at all */ |