linux-kernel - [PATCH 3.10 273/319] tracing: Move mutex to protect against resetting of seq data

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Message-Id: <1486322541-8206-174-git-send-email-w@1wt.eu>
Date:   Sun,  5 Feb 2017 20:21:35 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 273/319] tracing: Move mutex to protect against resetting of seq data

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

commit 1245800c0f96eb6ebb368593e251d66c01e61022 upstream.

The iter->seq can be reset outside the protection of the mutex. So can
reading of user data. Move the mutex up to the beginning of the function.

Fixes: d7350c3f45694 ("tracing/core: make the read callbacks reentrants")
Reported-by: Al Viro <viro@...IV.linux.org.uk>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 kernel/trace/trace.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 4ff36f7..d6e7252 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4121,13 +4121,6 @@ tracing_read_pipe(struct file *filp, char __user *ubuf,
 	struct trace_array *tr = iter->tr;
 	ssize_t sret;
 
-	/* return any leftover data */
-	sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
-	if (sret != -EBUSY)
-		return sret;
-
-	trace_seq_init(&iter->seq);
-
 	/* copy the tracer to avoid using a global lock all around */
 	mutex_lock(&trace_types_lock);
 	if (unlikely(iter->trace->name != tr->current_trace->name))
@@ -4140,6 +4133,14 @@ tracing_read_pipe(struct file *filp, char __user *ubuf,
 	 * is protected.
 	 */
 	mutex_lock(&iter->mutex);
+
+	/* return any leftover data */
+	sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
+	if (sret != -EBUSY)
+		goto out;
+
+	trace_seq_init(&iter->seq);
+
 	if (iter->trace->read) {
 		sret = iter->trace->read(iter, filp, ubuf, cnt, ppos);
 		if (sret)
-- 
2.8.0.rc2.1.gbe9624a