diff options
Diffstat (limited to 'kernel/livepatch/transition.c')
| -rw-r--r-- | kernel/livepatch/transition.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c index f1b25ec581e0..135fc73e2e5d 100644 --- a/kernel/livepatch/transition.c +++ b/kernel/livepatch/transition.c @@ -14,6 +14,8 @@ #include "transition.h" #define MAX_STACK_ENTRIES 100 +DEFINE_PER_CPU(unsigned long[MAX_STACK_ENTRIES], klp_stack_entries); + #define STACK_ERR_BUF_SIZE 128 #define SIGNALS_TIMEOUT 15 @@ -240,12 +242,15 @@ static int klp_check_stack_func(struct klp_func *func, unsigned long *entries, */ static int klp_check_stack(struct task_struct *task, const char **oldname) { - static unsigned long entries[MAX_STACK_ENTRIES]; + unsigned long *entries = this_cpu_ptr(klp_stack_entries); struct klp_object *obj; struct klp_func *func; int ret, nr_entries; - ret = stack_trace_save_tsk_reliable(task, entries, ARRAY_SIZE(entries)); + /* Protect 'klp_stack_entries' */ + lockdep_assert_preemption_disabled(); + + ret = stack_trace_save_tsk_reliable(task, entries, MAX_STACK_ENTRIES); if (ret < 0) return -EINVAL; nr_entries = ret; |