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| author | Masami Hiramatsu <mhiramat@kernel.org> | 2020-10-15 16:55:07 +0200 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-02-11 22:31:57 +0100 |
| commit | efbbdaa22bb78761bff8dfdde027ad04bedd47ce (patch) | |
| tree | 71624da3d658aefa36ec8b02e153e0a727cee735 /include/trace/trace_events.h | |
| parent | selftests/ftrace: Add '!event' synthetic event syntax check (diff) | |
| download | linux-efbbdaa22bb78761bff8dfdde027ad04bedd47ce.tar.xz linux-efbbdaa22bb78761bff8dfdde027ad04bedd47ce.zip | |
tracing: Show real address for trace event arguments
To help debugging kernel, show real address for trace event arguments
in tracefs/trace{,pipe} instead of hashed pointer value.
Since ftrace human-readable format uses vsprintf(), all %p are
translated to hash values instead of pointer address.
However, when debugging the kernel, raw address value gives a
hint when comparing with the memory mapping in the kernel.
(Those are sometimes used with crash log, which is not hashed too)
So converting %p with %px when calling trace_seq_printf().
Moreover, this is not improving the security because the tracefs
can be used only by root user and the raw address values are readable
from tracefs/percpu/cpu*/trace_pipe_raw file.
Link: https://lkml.kernel.org/r/160277370703.29307.5134475491761971203.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/trace/trace_events.h')
| -rw-r--r-- | include/trace/trace_events.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/trace/trace_events.h b/include/trace/trace_events.h index 7785961d82ba..e6a8b3febc49 100644 --- a/include/trace/trace_events.h +++ b/include/trace/trace_events.h @@ -364,7 +364,7 @@ trace_raw_output_##call(struct trace_iterator *iter, int flags, \ if (ret != TRACE_TYPE_HANDLED) \ return ret; \ \ - trace_seq_printf(s, print); \ + trace_event_printf(iter, print); \ \ return trace_handle_return(s); \ } \ |