diff options
Diffstat (limited to 'include/linux/stackleak.h')
| -rw-r--r-- | include/linux/stackleak.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/include/linux/stackleak.h b/include/linux/stackleak.h index ccaab2043fcd..67430faa5c51 100644 --- a/include/linux/stackleak.h +++ b/include/linux/stackleak.h @@ -15,9 +15,22 @@ #ifdef CONFIG_GCC_PLUGIN_STACKLEAK #include <asm/stacktrace.h> +/* + * The lowest address on tsk's stack which we can plausibly erase. + */ +static __always_inline unsigned long +stackleak_task_low_bound(const struct task_struct *tsk) +{ + /* + * The lowest unsigned long on the task stack contains STACK_END_MAGIC, + * which we must not corrupt. + */ + return (unsigned long)end_of_stack(tsk) + sizeof(unsigned long); +} + static inline void stackleak_task_init(struct task_struct *t) { - t->lowest_stack = (unsigned long)end_of_stack(t) + sizeof(unsigned long); + t->lowest_stack = stackleak_task_low_bound(t); # ifdef CONFIG_STACKLEAK_METRICS t->prev_lowest_stack = t->lowest_stack; # endif |