tracing/perf: Avoid -Warray-bounds warning for __rel_loc macro

As done for trace_events.h, also fix the __rel_loc macro in perf.h,
which silences the -Warray-bounds warning:

In file included from ./include/linux/string.h:253,
                 from ./include/linux/bitmap.h:11,
                 from ./include/linux/cpumask.h:12,
                 from ./include/linux/mm_types_task.h:14,
                 from ./include/linux/mm_types.h:5,
                 from ./include/linux/buildid.h:5,
                 from ./include/linux/module.h:14,
                 from samples/trace_events/trace-events-sample.c:2:
In function '__fortify_strcpy',
    inlined from 'perf_trace_foo_rel_loc' at samples/trace_events/./trace-events-sample.h:519:1:
./include/linux/fortify-string.h:47:33: warning: '__builtin_strcpy' offset 12 is out of the bounds [
0, 4] [-Warray-bounds]
   47 | #define __underlying_strcpy     __builtin_strcpy
      |                                 ^
./include/linux/fortify-string.h:445:24: note: in expansion of macro '__underlying_strcpy'
  445 |                 return __underlying_strcpy(p, q);
      |                        ^~~~~~~~~~~~~~~~~~~

Also make __data struct member a proper flexible array to avoid future
problems.

Link: https://lkml.kernel.org/r/20220125220037.2738923-1-keescook@chromium.org
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Fixes: 55de2c0b5610c ("tracing: Add '__rel_loc' using trace event macros")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/include/trace/perf.h b/include/trace/perf.h
index ea4405d..5d48c46 100644 (file)
--- a/include/trace/perf.h
+++ b/include/trace/perf.h
@@ -23,8 +23,9 @@
 
 #undef __get_rel_dynamic_array
 #define __get_rel_dynamic_array(field) \
-               ((void *)(&__entry->__rel_loc_##field) +        \
-                sizeof(__entry->__rel_loc_##field) +           \
+               ((void *)__entry +                                      \
+                offsetof(typeof(*__entry), __rel_loc_##field) +        \
+                sizeof(__entry->__rel_loc_##field) +                   \
                 (__entry->__rel_loc_##field & 0xffff))
 
 #undef __get_rel_dynamic_array_len

diff --git a/include/trace/trace_events.h b/include/trace/trace_events.h
index 65d927e..3d29919 100644 (file)
--- a/include/trace/trace_events.h
+++ b/include/trace/trace_events.h
@@ -128,7 +128,7 @@ TRACE_MAKE_SYSTEM_STR();
        struct trace_event_raw_##name {                                 \
                struct trace_entry      ent;                            \
                tstruct                                                 \
-               char                    __data[0];                      \
+               char                    __data[];                       \
        };                                                              \
                                                                        \
        static struct trace_event_class event_class_##name;