mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-29 01:16:26 -05:00
96 lines
3.3 KiB
Diff
96 lines
3.3 KiB
Diff
From 8605330aac5a5785630aec8f64378a54891937cc Mon Sep 17 00:00:00 2001
|
|
From: Soheil Hassas Yeganeh <soheil@google.com>
|
|
Date: Sat, 18 Mar 2017 17:02:59 -0400
|
|
Subject: tcp: fix SCM_TIMESTAMPING_OPT_STATS for normal skbs
|
|
|
|
__sock_recv_timestamp can be called for both normal skbs (for
|
|
receive timestamps) and for skbs on the error queue (for transmit
|
|
timestamps).
|
|
|
|
Commit 1c885808e456
|
|
(tcp: SOF_TIMESTAMPING_OPT_STATS option for SO_TIMESTAMPING)
|
|
assumes any skb passed to __sock_recv_timestamp are from
|
|
the error queue, containing OPT_STATS in the content of the skb.
|
|
This results in accessing invalid memory or generating junk
|
|
data.
|
|
|
|
To fix this, set skb->pkt_type to PACKET_OUTGOING for packets
|
|
on the error queue. This is safe because on the receive path
|
|
on local sockets skb->pkt_type is never set to PACKET_OUTGOING.
|
|
With that, copy OPT_STATS from a packet, only if its pkt_type
|
|
is PACKET_OUTGOING.
|
|
|
|
Fixes: 1c885808e456 ("tcp: SOF_TIMESTAMPING_OPT_STATS option for SO_TIMESTAMPING")
|
|
Reported-by: JongHwan Kim <zzoru007@gmail.com>
|
|
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
|
|
Signed-off-by: Eric Dumazet <edumazet@google.com>
|
|
Signed-off-by: Willem de Bruijn <willemb@google.com>
|
|
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
---
|
|
net/core/skbuff.c | 10 ++++++++++
|
|
net/socket.c | 13 ++++++++++++-
|
|
2 files changed, 22 insertions(+), 1 deletion(-)
|
|
|
|
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
|
|
index cd4ba8c..b1fbd19 100644
|
|
--- a/net/core/skbuff.c
|
|
+++ b/net/core/skbuff.c
|
|
@@ -3694,6 +3694,15 @@ static void sock_rmem_free(struct sk_buff *skb)
|
|
atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
|
|
}
|
|
|
|
+static void skb_set_err_queue(struct sk_buff *skb)
|
|
+{
|
|
+ /* pkt_type of skbs received on local sockets is never PACKET_OUTGOING.
|
|
+ * So, it is safe to (mis)use it to mark skbs on the error queue.
|
|
+ */
|
|
+ skb->pkt_type = PACKET_OUTGOING;
|
|
+ BUILD_BUG_ON(PACKET_OUTGOING == 0);
|
|
+}
|
|
+
|
|
/*
|
|
* Note: We dont mem charge error packets (no sk_forward_alloc changes)
|
|
*/
|
|
@@ -3707,6 +3716,7 @@ int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb)
|
|
skb->sk = sk;
|
|
skb->destructor = sock_rmem_free;
|
|
atomic_add(skb->truesize, &sk->sk_rmem_alloc);
|
|
+ skb_set_err_queue(skb);
|
|
|
|
/* before exiting rcu section, make sure dst is refcounted */
|
|
skb_dst_force(skb);
|
|
diff --git a/net/socket.c b/net/socket.c
|
|
index e034fe4..692d698 100644
|
|
--- a/net/socket.c
|
|
+++ b/net/socket.c
|
|
@@ -652,6 +652,16 @@ int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
|
|
}
|
|
EXPORT_SYMBOL(kernel_sendmsg);
|
|
|
|
+static bool skb_is_err_queue(const struct sk_buff *skb)
|
|
+{
|
|
+ /* pkt_type of skbs enqueued on the error queue are set to
|
|
+ * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
|
|
+ * in recvmsg, since skbs received on a local socket will never
|
|
+ * have a pkt_type of PACKET_OUTGOING.
|
|
+ */
|
|
+ return skb->pkt_type == PACKET_OUTGOING;
|
|
+}
|
|
+
|
|
/*
|
|
* called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
|
|
*/
|
|
@@ -695,7 +705,8 @@ void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
|
|
put_cmsg(msg, SOL_SOCKET,
|
|
SCM_TIMESTAMPING, sizeof(tss), &tss);
|
|
|
|
- if (skb->len && (sk->sk_tsflags & SOF_TIMESTAMPING_OPT_STATS))
|
|
+ if (skb_is_err_queue(skb) && skb->len &&
|
|
+ (sk->sk_tsflags & SOF_TIMESTAMPING_OPT_STATS))
|
|
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
|
|
skb->len, skb->data);
|
|
}
|
|
--
|
|
cgit v1.1
|
|
|