From 1051ce4ab64db91f7b62369ddc321ba8747f8c84 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 16 Mar 2023 01:10:09 +0000 Subject: net/packet: annotate accesses to po->tp_tstamp tp_tstamp is read locklessly. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/packet/af_packet.c | 9 +++++---- net/packet/diag.c | 2 +- 2 files changed, 6 insertions(+), 5 deletions(-) (limited to 'net') diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index ecd9fc27e360..a27a811fa2b0 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -474,7 +474,7 @@ static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame, struct timespec64 ts; __u32 ts_status; - if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) + if (!(ts_status = tpacket_get_timestamp(skb, &ts, READ_ONCE(po->tp_tstamp)))) return 0; h.raw = frame; @@ -2403,7 +2403,8 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, * closer to the time of capture. */ ts_status = tpacket_get_timestamp(skb, &ts, - po->tp_tstamp | SOF_TIMESTAMPING_SOFTWARE); + READ_ONCE(po->tp_tstamp) | + SOF_TIMESTAMPING_SOFTWARE); if (!ts_status) ktime_get_real_ts64(&ts); @@ -3945,7 +3946,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, sockptr_t optval, if (copy_from_sockptr(&val, optval, sizeof(val))) return -EFAULT; - po->tp_tstamp = val; + WRITE_ONCE(po->tp_tstamp, val); return 0; } case PACKET_FANOUT: @@ -4097,7 +4098,7 @@ static int packet_getsockopt(struct socket *sock, int level, int optname, val = po->tp_loss; break; case PACKET_TIMESTAMP: - val = po->tp_tstamp; + val = READ_ONCE(po->tp_tstamp); break; case PACKET_FANOUT: val = (po->fanout ? diff --git a/net/packet/diag.c b/net/packet/diag.c index d704c7bf51b2..0abca32e2f87 100644 --- a/net/packet/diag.c +++ b/net/packet/diag.c @@ -18,7 +18,7 @@ static int pdiag_put_info(const struct packet_sock *po, struct sk_buff *nlskb) pinfo.pdi_version = po->tp_version; pinfo.pdi_reserve = po->tp_reserve; pinfo.pdi_copy_thresh = po->copy_thresh; - pinfo.pdi_tstamp = po->tp_tstamp; + pinfo.pdi_tstamp = READ_ONCE(po->tp_tstamp); pinfo.pdi_flags = 0; if (po->running) -- cgit v1.2.3-58-ga151