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tracing: Avoid -Warray-bounds warning for __rel_loc macro

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Since -Warray-bounds checks the destination size from the type of given
pointer, __assign_rel_str() macro gets warned because it passes the
pointer to the 'u32' field instead of 'trace_event_raw_*' data structure.
Pass the data address calculated from the 'trace_event_raw_*' instead of
'u32' __rel_loc field.

Link: https://lkml.kernel.org/r/20220125233154.dac280ed36944c0c2fe6f3ac@kernel.org

Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
[ This did not fix the warning, but is still a nice clean up ]
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2022-01-25 23:19:30 +09:00 committed by Steven Rostedt (Google)
parent e629e7b525
commit 58c5724ec2
1 changed files with 4 additions and 3 deletions
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7
include/trace/trace_events.h
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@ -318,9 +318,10 @@ TRACE_MAKE_SYSTEM_STR();
#define __get_str(field) ((char *)__get_dynamic_array(field))
#undef __get_rel_dynamic_array
#define __get_rel_dynamic_array(field) \
((void *)(&__entry->__rel_loc_##field) + \
sizeof(__entry->__rel_loc_##field) + \
#define __get_rel_dynamic_array(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