This is a note to let you know that I've just added the patch titled [PATCH stable 5.9 20/24] socket: fix option SO_TIMESTAMPING_NEW to the 5.9-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: socket-fix-option-so_timestamping_new.patch and it can be found in the queue-5.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Sat Oct 17 08:52:03 AM CEST 2020 From: Christian Eggers <ceggers@xxxxxxx> Date: Mon, 12 Oct 2020 11:35:41 +0200 Subject: [PATCH stable 5.9 20/24] socket: fix option SO_TIMESTAMPING_NEW From: Christian Eggers <ceggers@xxxxxxx> [ Upstream commit 59e611a566e7cd48cf54b6777a11fe3f9c2f9db5 ] The comparison of optname with SO_TIMESTAMPING_NEW is wrong way around, so SOCK_TSTAMP_NEW will first be set and than reset again. Additionally move it out of the test for SOF_TIMESTAMPING_RX_SOFTWARE as this seems unrelated. This problem happens on 32 bit platforms were the libc has already switched to struct timespec64 (from SO_TIMExxx_OLD to SO_TIMExxx_NEW socket options). ptp4l complains with "missing timestamp on transmitted peer delay request" because the wrong format is received (and discarded). Fixes: 9718475e6908 ("socket: Add SO_TIMESTAMPING_NEW") Signed-off-by: Christian Eggers <ceggers@xxxxxxx> Reviewed-by: Willem de Bruijn <willemdebruijn.kernel@xxxxxxxxx> Reviewed-by: Deepa Dinamani <deepa.kernel@xxxxxxxxx> Acked-by: Willem de Bruijn <willemb@xxxxxxxxxx> Acked-by: Deepa Dinamani <deepa.kernel@xxxxxxxxx> Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/core/sock.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1007,8 +1007,6 @@ set_sndbuf: __sock_set_timestamps(sk, valbool, true, true); break; case SO_TIMESTAMPING_NEW: - sock_set_flag(sk, SOCK_TSTAMP_NEW); - fallthrough; case SO_TIMESTAMPING_OLD: if (val & ~SOF_TIMESTAMPING_MASK) { ret = -EINVAL; @@ -1037,16 +1035,14 @@ set_sndbuf: } sk->sk_tsflags = val; + sock_valbool_flag(sk, SOCK_TSTAMP_NEW, optname == SO_TIMESTAMPING_NEW); + if (val & SOF_TIMESTAMPING_RX_SOFTWARE) sock_enable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE); - else { - if (optname == SO_TIMESTAMPING_NEW) - sock_reset_flag(sk, SOCK_TSTAMP_NEW); - + else sock_disable_timestamp(sk, (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); - } break; case SO_RCVLOWAT: Patches currently in stable-queue which might be from ceggers@xxxxxxx are queue-5.9/socket-fix-option-so_timestamping_new.patch queue-5.9/net-dsa-microchip-fix-race-condition.patch queue-5.9/socket-don-t-clear-sock_tstamp_new-when-so_timestampns-is-disabled.patch