fixes for 4.4

Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/queue-4.4/net-prevent-load-store-tearing-on-sk-sk_stamp.patch b/queue-4.4/net-prevent-load-store-tearing-on-sk-sk_stamp.patch
new file mode 100644 (file)
index 0000000..cdead3f
--- /dev/null
+++ b/queue-4.4/net-prevent-load-store-tearing-on-sk-sk_stamp.patch
@@ -0,0 +1,50 @@
+From 82c3f8a1f819e30e37e648f45a493b2d3f0a5abe Mon Sep 17 00:00:00 2001
+From: Sasha Levin <sashal@kernel.org>
+Date: Mon, 4 Nov 2019 21:38:43 -0800
+Subject: net: prevent load/store tearing on sk->sk_stamp
+
+From: Eric Dumazet <edumazet@google.com>
+
+[ Upstream commit f75359f3ac855940c5718af10ba089b8977bf339 ]
+
+Add a couple of READ_ONCE() and WRITE_ONCE() to prevent
+load-tearing and store-tearing in sock_read_timestamp()
+and sock_write_timestamp()
+
+This might prevent another KCSAN report.
+
+Fixes: 3a0ed3e96197 ("sock: Make sock->sk_stamp thread-safe")
+Signed-off-by: Eric Dumazet <edumazet@google.com>
+Cc: Deepa Dinamani <deepa.kernel@gmail.com>
+Acked-by: Deepa Dinamani <deepa.kernel@gmail.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+Signed-off-by: Sasha Levin <sashal@kernel.org>
+---
+ include/net/sock.h | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/include/net/sock.h b/include/net/sock.h
+index 1571ab68de160..5ed4786a2058b 100644
+--- a/include/net/sock.h
++++ b/include/net/sock.h
+@@ -2174,7 +2174,7 @@ static inline ktime_t sock_read_timestamp(struct sock *sk)
+ 
+       return kt;
+ #else
+-      return sk->sk_stamp;
++      return READ_ONCE(sk->sk_stamp);
+ #endif
+ }
+ 
+@@ -2185,7 +2185,7 @@ static inline void sock_write_timestamp(struct sock *sk, ktime_t kt)
+       sk->sk_stamp = kt;
+       write_sequnlock(&sk->sk_stamp_seq);
+ #else
+-      sk->sk_stamp = kt;
++      WRITE_ONCE(sk->sk_stamp, kt);
+ #endif
+ }
+ 
+-- 
+2.20.1
+

diff --git a/queue-4.4/series b/queue-4.4/series
index 5248c74cf2c1dc474f743c5230e35c1e7190185e..5da2c49da745856078329964e067906f301f55e5 100644 (file)
--- a/queue-4.4/series
+++ b/queue-4.4/series
@@ -40,3 +40,4 @@ e1000-fix-memory-leaks.patch
 can-flexcan-disable-completely-the-ecc-mechanism.patch
 mm-filemap.c-don-t-initiate-writeback-if-mapping-has-no-dirty-pages.patch
 cgroup-writeback-don-t-switch-wbs-immediately-on-dead-wbs-if-the-memcg-is-dead.patch
+net-prevent-load-store-tearing-on-sk-sk_stamp.patch