diff options
Diffstat (limited to 'include/trace')
| -rw-r--r-- | include/trace/ftrace.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h index a05524fa245d..f64fbaae781a 100644 --- a/include/trace/ftrace.h +++ b/include/trace/ftrace.h | |||
| @@ -648,6 +648,9 @@ __attribute__((section("_ftrace_events"))) event_##call = { \ | |||
| 648 | * char raw_data[__entry_size]; <- allocate our sample in the stack | 648 | * char raw_data[__entry_size]; <- allocate our sample in the stack |
| 649 | * struct trace_entry *ent; | 649 | * struct trace_entry *ent; |
| 650 | * | 650 | * |
| 651 | * zero dead bytes from alignment to avoid stack leak to userspace: | ||
| 652 | * | ||
| 653 | * *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL; | ||
| 651 | * entry = (struct ftrace_raw_<call> *)raw_data; | 654 | * entry = (struct ftrace_raw_<call> *)raw_data; |
| 652 | * ent = &entry->ent; | 655 | * ent = &entry->ent; |
| 653 | * tracing_generic_entry_update(ent, irq_flags, pc); | 656 | * tracing_generic_entry_update(ent, irq_flags, pc); |
| @@ -698,6 +701,7 @@ static void ftrace_profile_##call(proto) \ | |||
| 698 | char raw_data[__entry_size]; \ | 701 | char raw_data[__entry_size]; \ |
| 699 | struct trace_entry *ent; \ | 702 | struct trace_entry *ent; \ |
| 700 | \ | 703 | \ |
| 704 | *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL; \ | ||
| 701 | entry = (struct ftrace_raw_##call *)raw_data; \ | 705 | entry = (struct ftrace_raw_##call *)raw_data; \ |
| 702 | ent = &entry->ent; \ | 706 | ent = &entry->ent; \ |
| 703 | tracing_generic_entry_update(ent, irq_flags, pc); \ | 707 | tracing_generic_entry_update(ent, irq_flags, pc); \ |