linux-kernel - [PATCH 3/5] tracing: Have eprobes use filtering logic of trace events

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Message-ID: <20211130024319.068451680@goodmis.org>
Date:   Mon, 29 Nov 2021 21:39:48 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 3/5] tracing: Have eprobes use filtering logic of trace events

From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>

The eprobes open code the reserving of the event on the ring buffer for
ftrace instead of using the ftrace event wrappers, which means that it
doesn't get affected by the filters, breaking the filtering logic on user
space.

Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 kernel/trace/trace_eprobe.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
index 928867f527e7..88487752d307 100644
--- a/kernel/trace/trace_eprobe.c
+++ b/kernel/trace/trace_eprobe.c
@@ -489,18 +489,12 @@ __eprobe_trace_func(struct eprobe_data *edata, void *rec)
 	if (trace_trigger_soft_disabled(edata->file))
 		return;
 
-	fbuffer.trace_ctx = tracing_gen_ctx();
-	fbuffer.trace_file = edata->file;
-
 	dsize = get_eprobe_size(&edata->ep->tp, rec);
-	fbuffer.regs = NULL;
-
-	fbuffer.event =
-		trace_event_buffer_lock_reserve(&fbuffer.buffer, edata->file,
-					call->event.type,
-					sizeof(*entry) + edata->ep->tp.size + dsize,
-					fbuffer.trace_ctx);
-	if (!fbuffer.event)
+
+	entry = trace_event_buffer_reserve(&fbuffer, edata->file,
+					   sizeof(*entry) + edata->ep->tp.size + dsize);
+
+	if (!entry)
 		return;
 
 	entry = fbuffer.entry = ring_buffer_event_data(fbuffer.event);
-- 
2.33.0