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 linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-Id: <20230811025530.3510703-1-imagedong@tencent.com> Date: Fri, 11 Aug 2023 10:55:26 +0800 From: menglong8.dong@...il.com To: edumazet@...gle.com, ncardwell@...gle.com Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, dsahern@...nel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, flyingpeng@...cent.com, Menglong Dong <imagedong@...cent.com> Subject: [PATCH net-next v4 0/4] net: tcp: support probing OOM From: Menglong Dong <imagedong@...cent.com> In this series, we make some small changes to make the tcp retransmission become zero-window probes if the receiver drops the skb because of memory pressure. In the 1st patch, we reply a zero-window ACK if the skb is dropped because out of memory, instead of dropping the skb silently. In the 2nd patch, we allow a zero-window ACK to update the window. In the 3rd patch, fix unexcepted socket die when snd_wnd is 0 in tcp_retransmit_timer(). In the 4th patch, we refactor the debug message in tcp_retransmit_timer() to make it more correct. After these changes, the tcp can probe the OOM of the receiver forever. Changes since v3: - make the timeout "2 * TCP_RTO_MAX" in the 3rd patch - tp->retrans_stamp is not based on jiffies and can't be compared with icsk->icsk_timeout in the 3rd patch. Fix it. - introduce the 4th patch Changes since v2: - refactor the code to avoid code duplication in the 1st patch - use after() instead of max() in tcp_rtx_probe0_timed_out() Changes since v1: - send 0 rwin ACK for the receive queue empty case when necessary in the 1st patch - send the ACK immediately by using the ICSK_ACK_NOW flag in the 1st patch - consider the case of the connection restart from idle, as Neal comment, in the 3rd patch Menglong Dong (4): net: tcp: send zero-window ACK when no memory net: tcp: allow zero-window ACK update the window net: tcp: fix unexcepted socket die when snd_wnd is 0 net: tcp: refactor the dbg message in tcp_retransmit_timer() include/net/inet_connection_sock.h | 3 ++- net/ipv4/tcp_input.c | 20 ++++++++++----- net/ipv4/tcp_output.c | 14 +++++++--- net/ipv4/tcp_timer.c | 41 ++++++++++++++++++++++-------- 4 files changed, 56 insertions(+), 22 deletions(-) -- 2.40.1
Powered by blists - more mailing lists