Adding debian version 4.19.249-2.debian/4.19.249-2debian

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 99 insertions, 0 deletions

diff --git a/debian/patches-rt/0202-net-add-back-the-missing-serialization-in-ip_send_un.patch b/debian/patches-rt/0202-net-add-back-the-missing-serialization-in-ip_send_un.patch
new file mode 100644
index 000000000..b6925c62f
--- /dev/null
+++ b/debian/patches-rt/0202-net-add-back-the-missing-serialization-in-ip_send_un.patch
@@ -0,0 +1,99 @@
+From 3254a7bf68224051974bf79f76549e4592e45262 Mon Sep 17 00:00:00 2001
+From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Date: Wed, 31 Aug 2016 17:21:56 +0200
+Subject: [PATCH 202/347] net: add back the missing serialization in
+ ip_send_unicast_reply()
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
+
+Some time ago Sami Pietikäinen reported a crash on -RT in
+ip_send_unicast_reply() which was later fixed by Nicholas Mc Guire
+(v3.12.8-rt11). Later (v3.18.8) the code was reworked and I dropped the
+patch. As it turns out it was mistake.
+I have reports that the same crash is possible with a similar backtrace.
+It seems that vanilla protects access to this_cpu_ptr() via
+local_bh_disable(). This does not work the on -RT since we can have
+NET_RX and NET_TX running in parallel on the same CPU.
+This is brings back the old locks.
+
+|Unable to handle kernel NULL pointer dereference at virtual address 00000010
+|PC is at __ip_make_skb+0x198/0x3e8
+|[<c04e39d8>] (__ip_make_skb) from [<c04e3ca8>] (ip_push_pending_frames+0x20/0x40)
+|[<c04e3ca8>] (ip_push_pending_frames) from [<c04e3ff0>] (ip_send_unicast_reply+0x210/0x22c)
+|[<c04e3ff0>] (ip_send_unicast_reply) from [<c04fbb54>] (tcp_v4_send_reset+0x190/0x1c0)
+|[<c04fbb54>] (tcp_v4_send_reset) from [<c04fcc1c>] (tcp_v4_do_rcv+0x22c/0x288)
+|[<c04fcc1c>] (tcp_v4_do_rcv) from [<c0474364>] (release_sock+0xb4/0x150)
+|[<c0474364>] (release_sock) from [<c04ed904>] (tcp_close+0x240/0x454)
+|[<c04ed904>] (tcp_close) from [<c0511408>] (inet_release+0x74/0x7c)
+|[<c0511408>] (inet_release) from [<c0470728>] (sock_release+0x30/0xb0)
+|[<c0470728>] (sock_release) from [<c0470abc>] (sock_close+0x1c/0x24)
+|[<c0470abc>] (sock_close) from [<c0115ec4>] (__fput+0xe8/0x20c)
+|[<c0115ec4>] (__fput) from [<c0116050>] (____fput+0x18/0x1c)
+|[<c0116050>] (____fput) from [<c0058138>] (task_work_run+0xa4/0xb8)
+|[<c0058138>] (task_work_run) from [<c0011478>] (do_work_pending+0xd0/0xe4)
+|[<c0011478>] (do_work_pending) from [<c000e740>] (work_pending+0xc/0x20)
+|Code: e3530001 8a000001 e3a00040 ea000011 (e5973010)
+
+Cc: stable-rt@vger.kernel.org
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+---
+ net/ipv4/tcp_ipv4.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
+index 2719c60f285b..8e2db5007f59 100644
+--- a/net/ipv4/tcp_ipv4.c
++++ b/net/ipv4/tcp_ipv4.c
+@@ -62,6 +62,7 @@
+ #include <linux/init.h>
+ #include <linux/times.h>
+ #include <linux/slab.h>
++#include <linux/locallock.h>
+ 
+ #include <net/net_namespace.h>
+ #include <net/icmp.h>
+@@ -637,6 +638,7 @@ void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb)
+ }
+ EXPORT_SYMBOL(tcp_v4_send_check);
+ 
++static DEFINE_LOCAL_IRQ_LOCK(tcp_sk_lock);
+ /*
+  *	This routine will send an RST to the other tcp.
+  *
+@@ -771,6 +773,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
+ 	arg.tos = ip_hdr(skb)->tos;
+ 	arg.uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL);
+ 	local_bh_disable();
++	local_lock(tcp_sk_lock);
+ 	ctl_sk = *this_cpu_ptr(net->ipv4.tcp_sk);
+ 	if (sk)
+ 		ctl_sk->sk_mark = (sk->sk_state == TCP_TIME_WAIT) ?
+@@ -783,6 +786,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
+ 	ctl_sk->sk_mark = 0;
+ 	__TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
+ 	__TCP_INC_STATS(net, TCP_MIB_OUTRSTS);
++	local_unlock(tcp_sk_lock);
+ 	local_bh_enable();
+ 
+ #ifdef CONFIG_TCP_MD5SIG
+@@ -863,6 +867,7 @@ static void tcp_v4_send_ack(const struct sock *sk,
+ 	arg.tos = tos;
+ 	arg.uid = sock_net_uid(net, sk_fullsock(sk) ? sk : NULL);
+ 	local_bh_disable();
++	local_lock(tcp_sk_lock);
+ 	ctl_sk = *this_cpu_ptr(net->ipv4.tcp_sk);
+ 	if (sk)
+ 		ctl_sk->sk_mark = (sk->sk_state == TCP_TIME_WAIT) ?
+@@ -874,6 +879,7 @@ static void tcp_v4_send_ack(const struct sock *sk,
+ 
+ 	ctl_sk->sk_mark = 0;
+ 	__TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
++	local_unlock(tcp_sk_lock);
+ 	local_bh_enable();
+ }
+ 
+-- 
+2.36.1
+