tcp/udp: Call inet6_destroy_sock() in IPv6 sk->sk_destruct().
Originally, inet6_sk(sk)->XXX were changed under lock_sock(), so we were able to clean them up by calling inet6_destroy_sock() during the IPv6 -> IPv4 conversion by IPV6_ADDRFORM. However, commit03485f2adc
("udpv6: Add lockless sendmsg() support") added a lockless memory allocation path, which could cause a memory leak: setsockopt(IPV6_ADDRFORM) sendmsg() +-----------------------+ +-------+ - do_ipv6_setsockopt(sk, ...) - udpv6_sendmsg(sk, ...) - sockopt_lock_sock(sk) ^._ called via udpv6_prot - lock_sock(sk) before WRITE_ONCE() - WRITE_ONCE(sk->sk_prot, &tcp_prot) - inet6_destroy_sock() - if (!corkreq) - sockopt_release_sock(sk) - ip6_make_skb(sk, ...) - release_sock(sk) ^._ lockless fast path for the non-corking case - __ip6_append_data(sk, ...) - ipv6_local_rxpmtu(sk, ...) - xchg(&np->rxpmtu, skb) ^._ rxpmtu is never freed. - goto out_no_dst; - lock_sock(sk) For now, rxpmtu is only the case, but not to miss the future change and a similar bug fixed in commite27326009a
("net: ping6: Fix memleak in ipv6_renew_options()."), let's set a new function to IPv6 sk->sk_destruct() and call inet6_cleanup_sock() there. Since the conversion does not change sk->sk_destruct(), we can guarantee that we can clean up IPv6 resources finally. We can now remove all inet6_destroy_sock() calls from IPv6 protocol specific ->destroy() functions, but such changes are invasive to backport. So they can be posted as a follow-up later for net-next. Fixes:03485f2adc
("udpv6: Add lockless sendmsg() support") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Родитель
21985f4337
Коммит
d38afeec26
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@ -1183,6 +1183,7 @@ void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
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void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
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void inet6_cleanup_sock(struct sock *sk);
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void inet6_sock_destruct(struct sock *sk);
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int inet6_release(struct socket *sock);
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int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
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int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
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@ -247,7 +247,7 @@ static inline bool udp_sk_bound_dev_eq(struct net *net, int bound_dev_if,
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}
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/* net/ipv4/udp.c */
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void udp_destruct_sock(struct sock *sk);
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void udp_destruct_common(struct sock *sk);
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void skb_consume_udp(struct sock *sk, struct sk_buff *skb, int len);
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int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb);
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void udp_skb_destructor(struct sock *sk, struct sk_buff *skb);
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@ -25,14 +25,6 @@ static __inline__ int udplite_getfrag(void *from, char *to, int offset,
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return copy_from_iter_full(to, len, &msg->msg_iter) ? 0 : -EFAULT;
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}
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/* Designate sk as UDP-Lite socket */
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static inline int udplite_sk_init(struct sock *sk)
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{
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udp_init_sock(sk);
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udp_sk(sk)->pcflag = UDPLITE_BIT;
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return 0;
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}
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/*
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* Checksumming routines
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*/
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@ -1598,7 +1598,7 @@ drop:
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}
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EXPORT_SYMBOL_GPL(__udp_enqueue_schedule_skb);
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void udp_destruct_sock(struct sock *sk)
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void udp_destruct_common(struct sock *sk)
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{
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/* reclaim completely the forward allocated memory */
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struct udp_sock *up = udp_sk(sk);
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@ -1611,10 +1611,14 @@ void udp_destruct_sock(struct sock *sk)
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kfree_skb(skb);
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}
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udp_rmem_release(sk, total, 0, true);
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}
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EXPORT_SYMBOL_GPL(udp_destruct_common);
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static void udp_destruct_sock(struct sock *sk)
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{
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udp_destruct_common(sk);
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inet_sock_destruct(sk);
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}
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EXPORT_SYMBOL_GPL(udp_destruct_sock);
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int udp_init_sock(struct sock *sk)
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{
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@ -1622,7 +1626,6 @@ int udp_init_sock(struct sock *sk)
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sk->sk_destruct = udp_destruct_sock;
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return 0;
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}
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EXPORT_SYMBOL_GPL(udp_init_sock);
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void skb_consume_udp(struct sock *sk, struct sk_buff *skb, int len)
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{
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@ -17,6 +17,14 @@
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struct udp_table udplite_table __read_mostly;
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EXPORT_SYMBOL(udplite_table);
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/* Designate sk as UDP-Lite socket */
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static int udplite_sk_init(struct sock *sk)
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{
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udp_init_sock(sk);
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udp_sk(sk)->pcflag = UDPLITE_BIT;
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return 0;
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}
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static int udplite_rcv(struct sk_buff *skb)
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{
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return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
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@ -109,6 +109,12 @@ static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
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return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
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}
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void inet6_sock_destruct(struct sock *sk)
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{
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inet6_cleanup_sock(sk);
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inet_sock_destruct(sk);
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}
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static int inet6_create(struct net *net, struct socket *sock, int protocol,
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int kern)
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{
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@ -201,7 +207,7 @@ lookup_protocol:
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inet->hdrincl = 1;
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}
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sk->sk_destruct = inet_sock_destruct;
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sk->sk_destruct = inet6_sock_destruct;
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sk->sk_family = PF_INET6;
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sk->sk_protocol = protocol;
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@ -56,6 +56,19 @@
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#include <trace/events/skb.h>
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#include "udp_impl.h"
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static void udpv6_destruct_sock(struct sock *sk)
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{
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udp_destruct_common(sk);
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inet6_sock_destruct(sk);
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}
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int udpv6_init_sock(struct sock *sk)
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{
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skb_queue_head_init(&udp_sk(sk)->reader_queue);
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sk->sk_destruct = udpv6_destruct_sock;
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return 0;
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}
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static u32 udp6_ehashfn(const struct net *net,
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const struct in6_addr *laddr,
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const u16 lport,
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@ -1733,7 +1746,7 @@ struct proto udpv6_prot = {
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.connect = ip6_datagram_connect,
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.disconnect = udp_disconnect,
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.ioctl = udp_ioctl,
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.init = udp_init_sock,
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.init = udpv6_init_sock,
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.destroy = udpv6_destroy_sock,
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.setsockopt = udpv6_setsockopt,
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.getsockopt = udpv6_getsockopt,
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@ -12,6 +12,7 @@ int __udp6_lib_rcv(struct sk_buff *, struct udp_table *, int);
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int __udp6_lib_err(struct sk_buff *, struct inet6_skb_parm *, u8, u8, int,
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__be32, struct udp_table *);
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int udpv6_init_sock(struct sock *sk);
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int udp_v6_get_port(struct sock *sk, unsigned short snum);
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void udp_v6_rehash(struct sock *sk);
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@ -12,6 +12,13 @@
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#include <linux/proc_fs.h>
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#include "udp_impl.h"
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static int udplitev6_sk_init(struct sock *sk)
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{
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udpv6_init_sock(sk);
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udp_sk(sk)->pcflag = UDPLITE_BIT;
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return 0;
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}
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static int udplitev6_rcv(struct sk_buff *skb)
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{
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return __udp6_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
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@ -38,7 +45,7 @@ struct proto udplitev6_prot = {
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.connect = ip6_datagram_connect,
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.disconnect = udp_disconnect,
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.ioctl = udp_ioctl,
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.init = udplite_sk_init,
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.init = udplitev6_sk_init,
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.destroy = udpv6_destroy_sock,
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.setsockopt = udpv6_setsockopt,
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.getsockopt = udpv6_getsockopt,
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