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tracing/user_events: Use WRITE instead of READ for io vector import 

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@efficios.com>
Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Beau Belgrave 2022-07-28 16:33:05 -07:00 committed by Steven Rostedt (Google)
parent 9cbf12343d
commit 95f187603d
1 changed files with 2 additions and 1 deletions
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3
kernel/trace/trace_events_user.c
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@ -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);