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net: introduce lockdep_is_held and update various places to use it

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The socket is either locked if we hold the slock spin_lock for
lock_sock_fast and unlock_sock_fast or we own the lock (sk_lock.owned
!= 0). Check for this and at the same time improve that the current
thread/cpu is really holding the lock.

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa 2016-04-05 17:10:15 +02:00 committed by David S. Miller
parent 61881cfb5a
commit 1e1d04e678
10 changed files with 26 additions and 17 deletions
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12
include/net/sock.h
View File

@ -1360,6 +1360,14 @@ do { \
lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \
} while (0) } while (0)
static bool lockdep_sock_is_held(const struct sock *csk)
{
struct sock *sk = (struct sock *)csk;
return lockdep_is_held(&sk->sk_lock) ||
lockdep_is_held(&sk->sk_lock.slock);
}
void lock_sock_nested(struct sock *sk, int subclass); void lock_sock_nested(struct sock *sk, int subclass);
static inline void lock_sock(struct sock *sk) static inline void lock_sock(struct sock *sk)
@ -1598,8 +1606,8 @@ static inline void sk_rethink_txhash(struct sock *sk)
static inline struct dst_entry * static inline struct dst_entry *
__sk_dst_get(struct sock *sk) __sk_dst_get(struct sock *sk)
{ {
return rcu_dereference_check(sk->sk_dst_cache, sock_owned_by_user(sk) || return rcu_dereference_check(sk->sk_dst_cache,
lockdep_is_held(&sk->sk_lock.slock)); lockdep_sock_is_held(sk));
} }
static inline struct dst_entry * static inline struct dst_entry *

2
net/dccp/ipv4.c
View File

@ -62,7 +62,7 @@ int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
nexthop = daddr = usin->sin_addr.s_addr; nexthop = daddr = usin->sin_addr.s_addr;
inet_opt = rcu_dereference_protected(inet->inet_opt, inet_opt = rcu_dereference_protected(inet->inet_opt,
sock_owned_by_user(sk)); lockdep_sock_is_held(sk));
if (inet_opt != NULL && inet_opt->opt.srr) { if (inet_opt != NULL && inet_opt->opt.srr) {
if (daddr == 0) if (daddr == 0)
return -EINVAL; return -EINVAL;

2
net/dccp/ipv6.c
View File

@ -868,7 +868,7 @@ static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
fl6.fl6_sport = inet->inet_sport; fl6.fl6_sport = inet->inet_sport;
security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk)); opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
final_p = fl6_update_dst(&fl6, opt, &final); final_p = fl6_update_dst(&fl6, opt, &final);
dst = ip6_dst_lookup_flow(sk, &fl6, final_p); dst = ip6_dst_lookup_flow(sk, &fl6, final_p);

2
net/ipv4/af_inet.c
View File

@ -1107,7 +1107,7 @@ static int inet_sk_reselect_saddr(struct sock *sk)
struct ip_options_rcu *inet_opt; struct ip_options_rcu *inet_opt;
inet_opt = rcu_dereference_protected(inet->inet_opt, inet_opt = rcu_dereference_protected(inet->inet_opt,
sock_owned_by_user(sk)); lockdep_sock_is_held(sk));
if (inet_opt && inet_opt->opt.srr) if (inet_opt && inet_opt->opt.srr)
daddr = inet_opt->opt.faddr; daddr = inet_opt->opt.faddr;

3
net/ipv4/cipso_ipv4.c
View File

@ -1933,7 +1933,8 @@ int cipso_v4_sock_setattr(struct sock *sk,
sk_inet = inet_sk(sk); sk_inet = inet_sk(sk);
old = rcu_dereference_protected(sk_inet->inet_opt, sock_owned_by_user(sk)); old = rcu_dereference_protected(sk_inet->inet_opt,
lockdep_sock_is_held(sk));
if (sk_inet->is_icsk) { if (sk_inet->is_icsk) {
sk_conn = inet_csk(sk); sk_conn = inet_csk(sk);
if (old) if (old)

4
net/ipv4/ip_sockglue.c
View File

@ -642,7 +642,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
if (err) if (err)
break; break;
old = rcu_dereference_protected(inet->inet_opt, old = rcu_dereference_protected(inet->inet_opt,
sock_owned_by_user(sk)); lockdep_sock_is_held(sk));
if (inet->is_icsk) { if (inet->is_icsk) {
struct inet_connection_sock *icsk = inet_csk(sk); struct inet_connection_sock *icsk = inet_csk(sk);
#if IS_ENABLED(CONFIG_IPV6) #if IS_ENABLED(CONFIG_IPV6)
@ -1302,7 +1302,7 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
struct ip_options_rcu *inet_opt; struct ip_options_rcu *inet_opt;
inet_opt = rcu_dereference_protected(inet->inet_opt, inet_opt = rcu_dereference_protected(inet->inet_opt,
sock_owned_by_user(sk)); lockdep_sock_is_held(sk));
opt->optlen = 0; opt->optlen = 0;
if (inet_opt) if (inet_opt)
memcpy(optbuf, &inet_opt->opt, memcpy(optbuf, &inet_opt->opt,

8
net/ipv4/tcp_ipv4.c
View File

@ -157,7 +157,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
nexthop = daddr = usin->sin_addr.s_addr; nexthop = daddr = usin->sin_addr.s_addr;
inet_opt = rcu_dereference_protected(inet->inet_opt, inet_opt = rcu_dereference_protected(inet->inet_opt,
sock_owned_by_user(sk)); lockdep_sock_is_held(sk));
if (inet_opt && inet_opt->opt.srr) { if (inet_opt && inet_opt->opt.srr) {
if (!daddr) if (!daddr)
return -EINVAL; return -EINVAL;
@ -882,8 +882,7 @@ struct tcp_md5sig_key *tcp_md5_do_lookup(const struct sock *sk,
/* caller either holds rcu_read_lock() or socket lock */ /* caller either holds rcu_read_lock() or socket lock */
md5sig = rcu_dereference_check(tp->md5sig_info, md5sig = rcu_dereference_check(tp->md5sig_info,
sock_owned_by_user(sk) || lockdep_sock_is_held(sk));
lockdep_is_held((spinlock_t *)&sk->sk_lock.slock));
if (!md5sig) if (!md5sig)
return NULL; return NULL;
#if IS_ENABLED(CONFIG_IPV6) #if IS_ENABLED(CONFIG_IPV6)
@ -928,8 +927,7 @@ int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
} }
md5sig = rcu_dereference_protected(tp->md5sig_info, md5sig = rcu_dereference_protected(tp->md5sig_info,
sock_owned_by_user(sk) || lockdep_sock_is_held(sk));
lockdep_is_held(&sk->sk_lock.slock));
if (!md5sig) { if (!md5sig) {
md5sig = kmalloc(sizeof(*md5sig), gfp); md5sig = kmalloc(sizeof(*md5sig), gfp);
if (!md5sig) if (!md5sig)

6
net/ipv6/ipv6_sockglue.c
View File

@ -407,7 +407,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW)) if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
break; break;
opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk)); opt = rcu_dereference_protected(np->opt,
lockdep_sock_is_held(sk));
opt = ipv6_renew_options(sk, opt, optname, opt = ipv6_renew_options(sk, opt, optname,
(struct ipv6_opt_hdr __user *)optval, (struct ipv6_opt_hdr __user *)optval,
optlen); optlen);
@ -1124,7 +1125,8 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
struct ipv6_txoptions *opt; struct ipv6_txoptions *opt;
lock_sock(sk); lock_sock(sk);
opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk)); opt = rcu_dereference_protected(np->opt,
lockdep_sock_is_held(sk));
len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len); len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
release_sock(sk); release_sock(sk);
/* check if ipv6_getsockopt_sticky() returns err code */ /* check if ipv6_getsockopt_sticky() returns err code */

2
net/ipv6/tcp_ipv6.c
View File

@ -234,7 +234,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
fl6.fl6_dport = usin->sin6_port; fl6.fl6_dport = usin->sin6_port;
fl6.fl6_sport = inet->inet_sport; fl6.fl6_sport = inet->inet_sport;
opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk)); opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
final_p = fl6_update_dst(&fl6, opt, &final); final_p = fl6_update_dst(&fl6, opt, &final);
security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));

2
net/socket.c
View File

@ -1046,7 +1046,7 @@ static int sock_fasync(int fd, struct file *filp, int on)
return -EINVAL; return -EINVAL;
lock_sock(sk); lock_sock(sk);
wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk)); wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk));
fasync_helper(fd, filp, on, &wq->fasync_list); fasync_helper(fd, filp, on, &wq->fasync_list);
if (!wq->fasync_list) if (!wq->fasync_list)