Patch "AIO: properly check iovec sizes" has been added to the 3.10-stable tree

This is a note to let you know that I've just added the patch titled

AIO: properly check iovec sizes

to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
aio-properly-check-iovec-sizes.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Greg KH <[email protected]>
Date: Fri, 19 Feb 2016 17:36:21 -0800
Subject: AIO: properly check iovec sizes

From: Greg Kroah-Hartman <[email protected]>

In Linus's tree, the iovec code has been reworked massively, but in older kernels the AIO layer should be checking this before passing the request on to other layers.

Many thanks to Ben Hawkes of Google Project Zero for pointing out the issue.

---
 fs/aio.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

@@ -977,12 +977,17 @@ static ssize_t aio_setup_vectored_rw(int
 
 static ssize_t aio_setup_single_vector(int rw, struct kiocb *kiocb)
 {
-	if (unlikely(!access_ok(!rw, kiocb->ki_buf, kiocb->ki_nbytes)))
-		return -EFAULT;
+	size_t len = kiocb->ki_nbytes;
+
+	if (len > MAX_RW_COUNT)
+		len = MAX_RW_COUNT;
+
+	if (unlikely(!access_ok(!rw, kiocb->ki_buf, len)))
+                return -EFAULT;
 
 	kiocb->ki_iovec = &kiocb->ki_inline_vec;
 	kiocb->ki_iovec->iov_base = kiocb->ki_buf;
-	kiocb->ki_iovec->iov_len = kiocb->ki_nbytes;
+	kiocb->ki_iovec->iov_len = len;
 	kiocb->ki_nr_segs = 1;
 	return 0;
 }

Patches currently in stable-queue which might be from [email protected] are

queue-3.10/mm-memory_hotplug.c-check-for-missing-sections-in-test_pages_in_a_zone.patch queue-3.10/aio-properly-check-iovec-sizes.patch