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 312dce7e0d5294934637c2ab557cfb2f474c5665..725bf6bd39f7c7db777b2d0980dfb09dde78b015 100644 (file)
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -198,6 +198,14 @@ struct ftrace_event_call {
 #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 cacc27a0e285163d9a8727a4131ffed478b8f46c..13b9731d30cf51c989bc91435253eaab6d1b259e 100644 (file)
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -137,7 +137,8 @@ extern struct trace_event_functions exit_syscall_print_funcs;
                .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 @@ extern struct trace_event_functions exit_syscall_print_funcs;
                .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 6f540123d43e681e92a40393dd43ab836a22b9eb..e718a917d89729e0f5c5861047a996ea71896a11 100644 (file)
--- 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)