lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Fri,  8 May 2020 00:50:21 +0000
From:   Kelly Littlepage <kelly@...chronos.com>
To:     willemdebruijn.kernel@...il.com
Cc:     davem@...emloft.net, edumazet@...gle.com, iris@...chronos.com,
        kelly@...chronos.com, kuba@...nel.org, kuznet@....inr.ac.ru,
        maloney@...gle.com, netdev@...r.kernel.org, soheil@...gle.com,
        yoshfuji@...ux-ipv6.org
Subject: [PATCH v2] net: tcp: fixes commit 98aaa913b4ed ("tcp: Extend SOF_TIMESTAMPING_RX_SOFTWARE to TCP recvmsg")

The stated intent of the original commit is to is to "return the timestamp
corresponding to the highest sequence number data returned." The current
implementation returns the timestamp for the last byte of the last fully
read skb, which is not necessarily the last byte in the recv buffer. This
patch converts behavior to the original definition, and to the behavior of
the previous draft versions of commit 98aaa913b4ed ("tcp: Extend
SOF_TIMESTAMPING_RX_SOFTWARE to TCP recvmsg") which also match this
behavior.

Co-developed-by: Iris Liu <iris@...chronos.com>
Signed-off-by: Iris Liu <iris@...chronos.com>
Signed-off-by: Kelly Littlepage <kelly@...chronos.com>
---
Thanks and credit to Willem de Bruijn for the revised commit language

 net/ipv4/tcp.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 6d87de434377..e72bd651d21a 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2154,13 +2154,15 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
 			tp->urg_data = 0;
 			tcp_fast_path_check(sk);
 		}
-		if (used + offset < skb->len)
-			continue;
 
 		if (TCP_SKB_CB(skb)->has_rxtstamp) {
 			tcp_update_recv_tstamps(skb, &tss);
 			cmsg_flags |= 2;
 		}
+
+		if (used + offset < skb->len)
+			continue;
+
 		if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)
 			goto found_fin_ok;
 		if (!(flags & MSG_PEEK))
-- 
2.26.2


-- 
This email and any attachments thereto may contain private, confidential, 
and privileged material for the sole use of the intended recipient. If you 
are not the intended recipient or otherwise believe that you have received 
this message in error, please notify the sender immediately and delete the 
original. Any review, copying, or distribution of this email (or any 
attachments thereto) by others is strictly prohibited. If this message was 
misdirected, OCX Group Inc. does not waive any confidentiality or privilege.

Powered by blists - more mailing lists