linux-kernel - [PATCH AUTOSEL 5.19 16/29] tracing/user_events: Use WRITE instead of READ for io vector import

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Date:   Mon, 17 Oct 2022 20:08:25 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Beau Belgrave <beaub@...ux.microsoft.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sasha Levin <sashal@...nel.org>, mingo@...hat.com
Subject: [PATCH AUTOSEL 5.19 16/29] tracing/user_events: Use WRITE instead of READ for io vector import

From: Beau Belgrave <beaub@...ux.microsoft.com>

[ Upstream commit 95f187603dbff69bef19b2ab3bb54d2c060f556d ]

import_single_range expects the direction/rw to be where it came from,
not the protection/limit. Since the import is in a write path use WRITE.

Link: https://lkml.kernel.org/r/20220728233309.1896-3-beaub@linux.microsoft.com
Link: https://lore.kernel.org/all/2059213643.196683.1648499088753.JavaMail.zimbra@efficios.com/

Reported-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Signed-off-by: Beau Belgrave <beaub@...ux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/trace/trace_events_user.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c
index 706e1686b5eb..4c9f6c776618 100644
--- a/kernel/trace/trace_events_user.c
+++ b/kernel/trace/trace_events_user.c
@@ -1245,7 +1245,8 @@ static ssize_t user_events_write(struct file *file, const char __user *ubuf,
 	if (unlikely(*ppos != 0))
 		return -EFAULT;
 
-	if (unlikely(import_single_range(READ, (char *)ubuf, count, &iov, &i)))
+	if (unlikely(import_single_range(WRITE, (char __user *)ubuf,
+					 count, &iov, &i)))
 		return -EFAULT;
 
 	return user_events_write_core(file, &i);
-- 
2.35.1