From: Beau Belgrave <beaub@linux.microsoft.com>
To: rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com
Cc: linux-trace-devel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, beaub@linux.microsoft.com
Subject: [PATCH 3/7] tracing/user_events: Use WRITE instead of READ for io vector import
Date: Fri, 1 Apr 2022 16:43:05 -0700 [thread overview]
Message-ID: <20220401234309.21252-4-beaub@linux.microsoft.com> (raw)
In-Reply-To: <20220401234309.21252-1-beaub@linux.microsoft.com>
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://lore.kernel.org/all/2059213643.196683.1648499088753.JavaMail.zimbra@efficios.com/
Reported-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
---
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 075d694d20e3..15edbf6b1e2e 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);
--
2.25.1
next prev parent reply other threads:[~2022-04-01 23:43 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-01 23:43 [PATCH 0/7] tracing/user_events: Update user_events ABI from Beau Belgrave
2022-04-01 23:43 ` [PATCH 1/7] tracing/user_events: Fix repeated word in comments Beau Belgrave
2022-04-01 23:43 ` [PATCH 2/7] tracing/user_events: Use NULL for strstr checks Beau Belgrave
2022-04-01 23:43 ` Beau Belgrave [this message]
2022-04-01 23:43 ` [PATCH 4/7] tracing/user_events: Ensure user provided strings are safely formatted Beau Belgrave
2022-04-01 23:43 ` [PATCH 5/7] tracing/user_events: Use refcount instead of atomic for ref tracking Beau Belgrave
2022-04-01 23:43 ` [PATCH 6/7] tracing/user_events: Use bits vs bytes for enabled status page data Beau Belgrave
2022-04-19 14:35 ` Mathieu Desnoyers
2022-04-19 18:57 ` Beau Belgrave
2022-04-19 21:26 ` Mathieu Desnoyers
2022-04-19 23:48 ` Beau Belgrave
2022-04-20 17:53 ` Mathieu Desnoyers
2022-04-20 20:12 ` Beau Belgrave
2022-04-20 20:21 ` Mathieu Desnoyers
2022-04-01 23:43 ` [PATCH 7/7] tracing/user_events: Update ABI documentation to align to bits vs bytes Beau Belgrave
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