From 75e63c249411773613f3f201bea9245623d9f57a Mon Sep 17 00:00:00 2001 From: Stijn Tintel Date: Thu, 15 Sep 2016 21:16:34 +0200 Subject: kernel: update kernel 3.18 to version 3.18.43 Refresh patches for all targets supporting 3.18 and not marked broken. Compile-tested on all targets using 3.18 and not marked broken. Changes to generic/610-netfilter_match_bypass_default_checks.patch based on 84d489f64f3b382d5544e342f66d8806e94e85d3. Signed-off-by: Stijn Tintel --- ...-tcp-make-challenge-acks-less-predictable.patch | 66 ---------------------- 1 file changed, 66 deletions(-) delete mode 100644 target/linux/generic/patches-3.18/096-tcp-make-challenge-acks-less-predictable.patch (limited to 'target/linux/generic/patches-3.18/096-tcp-make-challenge-acks-less-predictable.patch') diff --git a/target/linux/generic/patches-3.18/096-tcp-make-challenge-acks-less-predictable.patch b/target/linux/generic/patches-3.18/096-tcp-make-challenge-acks-less-predictable.patch deleted file mode 100644 index b984f6e86c..0000000000 --- a/target/linux/generic/patches-3.18/096-tcp-make-challenge-acks-less-predictable.patch +++ /dev/null @@ -1,66 +0,0 @@ -From 75ff39ccc1bd5d3c455b6822ab09e533c551f758 Mon Sep 17 00:00:00 2001 -From: Eric Dumazet -Date: Sun, 10 Jul 2016 10:04:02 +0200 -Subject: [PATCH] tcp: make challenge acks less predictable - -Yue Cao claims that current host rate limiting of challenge ACKS -(RFC 5961) could leak enough information to allow a patient attacker -to hijack TCP sessions. He will soon provide details in an academic -paper. - -This patch increases the default limit from 100 to 1000, and adds -some randomization so that the attacker can no longer hijack -sessions without spending a considerable amount of probes. - -Based on initial analysis and patch from Linus. - -Note that we also have per socket rate limiting, so it is tempting -to remove the host limit in the future. - -v2: randomize the count of challenge acks per second, not the period. - -Fixes: 282f23c6ee34 ("tcp: implement RFC 5961 3.2") -Reported-by: Yue Cao -Signed-off-by: Eric Dumazet -Suggested-by: Linus Torvalds -Cc: Yuchung Cheng -Cc: Neal Cardwell -Acked-by: Neal Cardwell -Acked-by: Yuchung Cheng -Signed-off-by: David S. Miller ---- - net/ipv4/tcp_input.c | 15 ++++++++++----- - 1 file changed, 10 insertions(+), 5 deletions(-) - ---- a/net/ipv4/tcp_input.c -+++ b/net/ipv4/tcp_input.c -@@ -88,7 +88,7 @@ int sysctl_tcp_adv_win_scale __read_most - EXPORT_SYMBOL(sysctl_tcp_adv_win_scale); - - /* rfc5961 challenge ack rate limiting */ --int sysctl_tcp_challenge_ack_limit = 100; -+int sysctl_tcp_challenge_ack_limit = 1000; - - int sysctl_tcp_stdurg __read_mostly; - int sysctl_tcp_rfc1337 __read_mostly; -@@ -3325,12 +3325,18 @@ static void tcp_send_challenge_ack(struc - static u32 challenge_timestamp; - static unsigned int challenge_count; - u32 now = jiffies / HZ; -+ u32 count; - - if (now != challenge_timestamp) { -+ u32 half = (sysctl_tcp_challenge_ack_limit + 1) >> 1; -+ - challenge_timestamp = now; -- challenge_count = 0; -+ WRITE_ONCE(challenge_count, half + -+ prandom_u32_max(sysctl_tcp_challenge_ack_limit)); - } -- if (++challenge_count <= sysctl_tcp_challenge_ack_limit) { -+ count = READ_ONCE(challenge_count); -+ if (count > 0) { -+ WRITE_ONCE(challenge_count, count - 1); - NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPCHALLENGEACK); - tcp_send_ack(sk); - } -- cgit v1.2.3