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Groups > linux.kernel > #1230585

[PATCH 3.19.y-ckt 099/102] ipv6: lock socket in ip6_datagram_connect()

From Kamal Mostafa <kamal@canonical.com>
Newsgroups linux.kernel
Subject [PATCH 3.19.y-ckt 099/102] ipv6: lock socket in ip6_datagram_connect()
Date 2015-09-22 20:00 +0200
Message-ID <qbA1e-46k-69@gated-at.bofh.it> (permalink)
References <qbA1c-46k-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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3.19.8-ckt7 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <edumazet@google.com>

[ Upstream commit 03645a11a570d52e70631838cb786eb4253eb463 ]

ip6_datagram_connect() is doing a lot of socket changes without
socket being locked.

This looks wrong, at least for udp_lib_rehash() which could corrupt
lists because of concurrent udp_sk(sk)->udp_portaddr_hash accesses.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 include/net/ip.h    |  1 +
 net/ipv4/datagram.c | 16 ++++++++++++----
 net/ipv6/datagram.c | 20 +++++++++++++++-----
 3 files changed, 28 insertions(+), 9 deletions(-)

diff --git a/include/net/ip.h b/include/net/ip.h
index c0c26c3..d00ebdf 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -160,6 +160,7 @@ static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
 }
 
 /* datagram.c */
+int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
 
 void ip4_datagram_release_cb(struct sock *sk);
diff --git a/net/ipv4/datagram.c b/net/ipv4/datagram.c
index 90c0e83..574fad9 100644
--- a/net/ipv4/datagram.c
+++ b/net/ipv4/datagram.c
@@ -20,7 +20,7 @@
 #include <net/route.h>
 #include <net/tcp_states.h>
 
-int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 {
 	struct inet_sock *inet = inet_sk(sk);
 	struct sockaddr_in *usin = (struct sockaddr_in *) uaddr;
@@ -39,8 +39,6 @@ int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 
 	sk_dst_reset(sk);
 
-	lock_sock(sk);
-
 	oif = sk->sk_bound_dev_if;
 	saddr = inet->inet_saddr;
 	if (ipv4_is_multicast(usin->sin_addr.s_addr)) {
@@ -82,9 +80,19 @@ int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 	sk_dst_set(sk, &rt->dst);
 	err = 0;
 out:
-	release_sock(sk);
 	return err;
 }
+EXPORT_SYMBOL(__ip4_datagram_connect);
+
+int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+	int res;
+
+	lock_sock(sk);
+	res = __ip4_datagram_connect(sk, uaddr, addr_len);
+	release_sock(sk);
+	return res;
+}
 EXPORT_SYMBOL(ip4_datagram_connect);
 
 /* Because UDP xmit path can manipulate sk_dst_cache without holding
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index 49f5e73..31fb5da 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -40,7 +40,7 @@ static bool ipv6_mapped_addr_any(const struct in6_addr *a)
 	return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
 }
 
-int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+static int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 {
 	struct sockaddr_in6	*usin = (struct sockaddr_in6 *) uaddr;
 	struct inet_sock	*inet = inet_sk(sk);
@@ -56,7 +56,7 @@ int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 	if (usin->sin6_family == AF_INET) {
 		if (__ipv6_only_sock(sk))
 			return -EAFNOSUPPORT;
-		err = ip4_datagram_connect(sk, uaddr, addr_len);
+		err = __ip4_datagram_connect(sk, uaddr, addr_len);
 		goto ipv4_connected;
 	}
 
@@ -98,9 +98,9 @@ int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 		sin.sin_addr.s_addr = daddr->s6_addr32[3];
 		sin.sin_port = usin->sin6_port;
 
-		err = ip4_datagram_connect(sk,
-					   (struct sockaddr *) &sin,
-					   sizeof(sin));
+		err = __ip4_datagram_connect(sk,
+					     (struct sockaddr *) &sin,
+					     sizeof(sin));
 
 ipv4_connected:
 		if (err)
@@ -204,6 +204,16 @@ out:
 	fl6_sock_release(flowlabel);
 	return err;
 }
+
+int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+	int res;
+
+	lock_sock(sk);
+	res = __ip6_datagram_connect(sk, uaddr, addr_len);
+	release_sock(sk);
+	return res;
+}
 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
 
 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
-- 
1.9.1

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[3.19.y-ckt stable] Linux 3.19.8-ckt7 stable review Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:00 +0200
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  [PATCH 3.19.y-ckt 093/102] net: phy: add locking to phy_read_mmd_indirect()/phy_write_mmd_indirect() Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:00 +0200
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  [PATCH 3.19.y-ckt 097/102] net: pktgen: fix race between pktgen_thread_worker() and kthread_stop() Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:00 +0200
  [PATCH 3.19.y-ckt 098/102] net: Fix skb csum races when peeking Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:00 +0200
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  [PATCH 3.19.y-ckt 099/102] ipv6: lock socket in ip6_datagram_connect() Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:00 +0200
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  [PATCH 3.19.y-ckt 069/102] x86/ldt: Further fix FPU emulation Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:10 +0200
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  [PATCH 3.19.y-ckt 065/102] mm/hwpoison: fix page refcount of unknown non LRU page Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:20 +0200
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  [PATCH 3.19.y-ckt 041/102] dm: fix dm_merge_bvec regression on 32 bit systems Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
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  [PATCH 3.19.y-ckt 037/102] usb: udc: core: add device_del() call to error pathway Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 033/102] MIPS: show_stack: Fix stack trace with EVA Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 016/102] usb: chipidea: ehci_init_driver is intended to call one time Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 045/102] mm, vmscan: Do not wait for page writeback for GFP_NOFS allocations Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 030/102] MIPS: Fix sched_getaffinity with MT FPAFF enabled Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 032/102] MIPS: do_mcheck: Fix kernel code dump with EVA Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 036/102] MIPS: Flush RPS on kernel entry with EVA Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 026/102] target/iscsi: Fix double free of a TUR followed by a solicited NOPOUT Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 022/102] usb: gadget: f_uac2: fix calculation of uac2->p_interval Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 024/102] USB: sierra: add 1199:68AB device ID Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 029/102] target: REPORT LUNS should return LUN 0 even for dynamic ACLs Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 017/102] crypto: qat - Fix invalid synchronization between register/unregister sym algs Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
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  [PATCH 3.19.y-ckt 043/102] drm/dp-mst: Remove debug WARN_ON Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 035/102] rtlwifi: rtl8723be: Add module parameter for MSI interrupts Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 039/102] drivers/usb: Delete XHCI command timer if necessary Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 038/102] xhci: fix off by one error in TRB DMA address boundary check Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 034/102] MIPS: Export get_c0_perfcount_int() Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 023/102] hwrng: core - correct error check of kthread_run call Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
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  [PATCH 3.19.y-ckt 008/102] virtio-net: drop NETIF_F_FRAGLIST Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 014/102] USB: qcserial: Add support for Dell Wireless 5809e 4G Modem Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 015/102] nfsd: Drop BUG_ON and ignore SECLABEL on absent filesystem Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 007/102] ipv6: addrconf: validate new MTU before applying it Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 021/102] xen-blkback: replace work_pending with work_busy in purge_persistent_gnt() Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 009/102] RDS: verify the underlying transport exists before creating a connection Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 005/102] md: flush ->event_work before stopping array. Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 012/102] PCI: Restore PCI_MSIX_FLAGS_BIRMASK definition Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 011/102] xen/gntdevt: Fix race condition in gntdev_release() Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 010/102] xen/gntdev: convert priv->lock to a mutex Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 020/102] xen-blkfront: don't add indirect pages to list when !feature_persistent Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200

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