[PATCH 4.17 314/324] packet: refine ring v3 block size test to hold one frame

From: Greg Kroah-Hartman
Date: Thu Aug 23 2018 - 05:10:44 EST

4.17-stable review patch. If anyone has any objections, please let me know.


From: Willem de Bruijn <willemb@xxxxxxxxxx>

commit 4576cd469d980317c4edd9173f8b694aa71ea3a3 upstream.

TPACKET_V3 stores variable length frames in fixed length blocks.
Blocks must be able to store a block header, optional private space
and at least one minimum sized frame.

Frames, even for a zero snaplen packet, store metadata headers and
optional reserved space.

In the block size bounds check, ensure that the frame of the
chosen configuration fits. This includes sockaddr_ll and optional

Syzbot was able to construct a ring with insuffient room for the
sockaddr_ll in the header of a zero-length frame, triggering an
out-of-bounds write in dev_parse_header.

Convert the comparison to less than, as zero is a valid snap len.
This matches the test for minimum tp_frame_size immediately below.

Fixes: f6fb8f100b80 ("af-packet: TPACKET_V3 flexible buffer implementation.")
Fixes: eb73190f4fbe ("net/packet: refine check for priv area size")
Reported-by: syzbot <syzkaller@xxxxxxxxxxxxxxxx>
Signed-off-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

net/packet/af_packet.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -4258,6 +4258,8 @@ static int packet_set_ring(struct sock *

if (req->tp_block_nr) {
+ unsigned int min_frame_size;
/* Sanity tests and some calculations */
err = -EBUSY;
if (unlikely(rb->pg_vec))
@@ -4280,12 +4282,12 @@ static int packet_set_ring(struct sock *
goto out;
if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
goto out;
+ min_frame_size = po->tp_hdrlen + po->tp_reserve;
if (po->tp_version >= TPACKET_V3 &&
- req->tp_block_size <=
- BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv) + sizeof(struct tpacket3_hdr))
+ req->tp_block_size <
+ BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv) + min_frame_size)
goto out;
- if (unlikely(req->tp_frame_size < po->tp_hdrlen +
- po->tp_reserve))
+ if (unlikely(req->tp_frame_size < min_frame_size))
goto out;
if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
goto out;