linux-kernel - [PATCH 6/6] tracing: Have event inject files inc the trace array ref count

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Message-ID: <20230907024804.292337868@goodmis.org>
Date:   Wed, 06 Sep 2023 22:47:16 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Zheng Yejian <zhengyejian1@...wei.com>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        stable@...r.kernel.org
Subject: [PATCH 6/6] tracing: Have event inject files inc the trace array ref count

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

The event inject files add events for a specific trace array. For an
instance, if the file is opened and the instance is deleted, reading or
writing to the file will cause a use after free.

Up the ref count of the trace_array when a event inject file is opened.

Link: https://lore.kernel.org/all/1cb3aee2-19af-c472-e265-05176fe9bd84@huawei.com/

Cc: stable@...r.kernel.org
Fixes: 6c3edaf9fd6a ("tracing: Introduce trace event injection")
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace_events_inject.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_inject.c b/kernel/trace/trace_events_inject.c
index abe805d471eb..8650562bdaa9 100644
--- a/kernel/trace/trace_events_inject.c
+++ b/kernel/trace/trace_events_inject.c
@@ -328,7 +328,8 @@ event_inject_read(struct file *file, char __user *buf, size_t size,
 }
 
 const struct file_operations event_inject_fops = {
-	.open = tracing_open_generic,
+	.open = tracing_open_file_tr,
 	.read = event_inject_read,
 	.write = event_inject_write,
+	.release = tracing_release_file_tr,
 };
-- 
2.40.1