tracing: Allow syscall trace events for non privileged users
As for the raw syscalls events, individual syscall events won't
leak system wide information on task bound tracing. Allow non
privileged users to use them in such workflow.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Jason Baron <jbaron@redhat.com>
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 312dce7..725bf6b 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -198,6 +198,14 @@
#endif
};
+#define __TRACE_EVENT_FLAGS(name, value) \
+ static int __init trace_init_flags_##name(void) \
+ { \
+ event_##name.flags = value; \
+ return 0; \
+ } \
+ early_initcall(trace_init_flags_##name);
+
#define PERF_MAX_TRACE_SIZE 2048
#define MAX_FILTER_PRED 32
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index cacc27a..13b9731d 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -137,7 +137,8 @@
.class = &event_class_syscall_enter, \
.event.funcs = &enter_syscall_print_funcs, \
.data = (void *)&__syscall_meta_##sname,\
- }
+ }; \
+ __TRACE_EVENT_FLAGS(enter_##sname, TRACE_EVENT_FL_CAP_ANY)
#define SYSCALL_TRACE_EXIT_EVENT(sname) \
static struct syscall_metadata \
@@ -152,7 +153,8 @@
.class = &event_class_syscall_exit, \
.event.funcs = &exit_syscall_print_funcs, \
.data = (void *)&__syscall_meta_##sname,\
- }
+ }; \
+ __TRACE_EVENT_FLAGS(exit_##sname, TRACE_EVENT_FL_CAP_ANY)
#define SYSCALL_METADATA(sname, nb) \
SYSCALL_TRACE_ENTER_EVENT(sname); \
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 6f54012..e718a91 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -84,12 +84,7 @@
#undef TRACE_EVENT_FLAGS
#define TRACE_EVENT_FLAGS(name, value) \
- static int __init trace_init_flags_##name(void) \
- { \
- event_##name.flags = value; \
- return 0; \
- } \
- early_initcall(trace_init_flags_##name);
+ __TRACE_EVENT_FLAGS(name, value)
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)