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net/tcp: Add missing lockdep annotations for TCP-AO hlist traversals

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Under CONFIG_PROVE_RCU_LIST + CONFIG_RCU_EXPERT
hlist_for_each_entry_rcu() provides very helpful splats, which help
to find possible issues. I missed CONFIG_RCU_EXPERT=y in my testing
config the same as described in
a3e4bf7f96 ("configs/debug: make sure PROVE_RCU_LIST=y takes effect").

The fix itself is trivial: add the very same lockdep annotations
as were used to dereference ao_info from the socket.

Reported-by: Jakub Kicinski <kuba@kernel.org>
Closes: https://lore.kernel.org/netdev/20241028152645.35a8be66@kernel.org/
Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com>
Link: https://patch.msgid.link/20241030-tcp-ao-hlist-lockdep-annotate-v1-1-bf641a64d7c6@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Dmitry Safonov 2024-10-30 04:22:33 +00:00 committed by Jakub Kicinski
parent 6578a7499a
commit 6b2d11e2d8
4 changed files with 29 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/tcp_ao.h
View File

@ -183,7 +183,8 @@ int tcp_ao_hash_skb(unsigned short int family,
const u8 *tkey, int hash_offset, u32 sne);
int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family,
sockptr_t optval, int optlen);
struct tcp_ao_key *tcp_ao_established_key(struct tcp_ao_info *ao,
struct tcp_ao_key *tcp_ao_established_key(const struct sock *sk,
struct tcp_ao_info *ao,
int sndid, int rcvid);
int tcp_ao_copy_all_matching(const struct sock *sk, struct sock *newsk,
struct request_sock *req, struct sk_buff *skb,

42
net/ipv4/tcp_ao.c
View File

@ -109,12 +109,13 @@ bool tcp_ao_ignore_icmp(const struct sock *sk, int family, int type, int code)
* it's known that the keys in ao_info are matching peer's
* family/address/VRF/etc.
*/
struct tcp_ao_key *tcp_ao_established_key(struct tcp_ao_info *ao,
struct tcp_ao_key *tcp_ao_established_key(const struct sock *sk,
struct tcp_ao_info *ao,
int sndid, int rcvid)
{
struct tcp_ao_key *key;
hlist_for_each_entry_rcu(key, &ao->head, node) {
hlist_for_each_entry_rcu(key, &ao->head, node, lockdep_sock_is_held(sk)) {
if ((sndid >= 0 && key->sndid != sndid) ||
(rcvid >= 0 && key->rcvid != rcvid))
continue;
@ -205,7 +206,7 @@ static struct tcp_ao_key *__tcp_ao_do_lookup(const struct sock *sk, int l3index,
if (!ao)
return NULL;
hlist_for_each_entry_rcu(key, &ao->head, node) {
hlist_for_each_entry_rcu(key, &ao->head, node, lockdep_sock_is_held(sk)) {
u8 prefixlen = min(prefix, key->prefixlen);
if (!tcp_ao_key_cmp(key, l3index, addr, prefixlen,
@ -793,7 +794,7 @@ int tcp_ao_prepare_reset(const struct sock *sk, struct sk_buff *skb,
if (!ao_info)
return -ENOENT;
*key = tcp_ao_established_key(ao_info, aoh->rnext_keyid, -1);
*key = tcp_ao_established_key(sk, ao_info, aoh->rnext_keyid, -1);
if (!*key)
return -ENOENT;
*traffic_key = snd_other_key(*key);
@ -979,7 +980,7 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb,
*/
key = READ_ONCE(info->rnext_key);
if (key->rcvid != aoh->keyid) {
key = tcp_ao_established_key(info, -1, aoh->keyid);
key = tcp_ao_established_key(sk, info, -1, aoh->keyid);
if (!key)
goto key_not_found;
}
@ -1003,7 +1004,7 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb,
aoh->rnext_keyid,
tcp_ao_hdr_maclen(aoh));
/* If the key is not found we do nothing. */
key = tcp_ao_established_key(info, aoh->rnext_keyid, -1);
key = tcp_ao_established_key(sk, info, aoh->rnext_keyid, -1);
if (key)
/* pairs with tcp_ao_del_cmd */
WRITE_ONCE(info->current_key, key);
@ -1163,7 +1164,7 @@ void tcp_ao_established(struct sock *sk)
if (!ao)
return;
hlist_for_each_entry_rcu(key, &ao->head, node)
hlist_for_each_entry_rcu(key, &ao->head, node, lockdep_sock_is_held(sk))
tcp_ao_cache_traffic_keys(sk, ao, key);
}
@ -1180,7 +1181,7 @@ void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb)
WRITE_ONCE(ao->risn, tcp_hdr(skb)->seq);
ao->rcv_sne = 0;
hlist_for_each_entry_rcu(key, &ao->head, node)
hlist_for_each_entry_rcu(key, &ao->head, node, lockdep_sock_is_held(sk))
tcp_ao_cache_traffic_keys(sk, ao, key);
}
@ -1256,14 +1257,14 @@ int tcp_ao_copy_all_matching(const struct sock *sk, struct sock *newsk,
key_head = rcu_dereference(hlist_first_rcu(&new_ao->head));
first_key = hlist_entry_safe(key_head, struct tcp_ao_key, node);
key = tcp_ao_established_key(new_ao, tcp_rsk(req)->ao_keyid, -1);
key = tcp_ao_established_key(req_to_sk(req), new_ao, tcp_rsk(req)->ao_keyid, -1);
if (key)
new_ao->current_key = key;
else
new_ao->current_key = first_key;
/* set rnext_key */
key = tcp_ao_established_key(new_ao, -1, tcp_rsk(req)->ao_rcv_next);
key = tcp_ao_established_key(req_to_sk(req), new_ao, -1, tcp_rsk(req)->ao_rcv_next);
if (key)
new_ao->rnext_key = key;
else
@ -1857,12 +1858,12 @@ static int tcp_ao_del_cmd(struct sock *sk, unsigned short int family,
* if there's any.
*/
if (cmd.set_current) {
new_current = tcp_ao_established_key(ao_info, cmd.current_key, -1);
new_current = tcp_ao_established_key(sk, ao_info, cmd.current_key, -1);
if (!new_current)
return -ENOENT;
}
if (cmd.set_rnext) {
new_rnext = tcp_ao_established_key(ao_info, -1, cmd.rnext);
new_rnext = tcp_ao_established_key(sk, ao_info, -1, cmd.rnext);
if (!new_rnext)
return -ENOENT;
}
@ -1902,7 +1903,8 @@ static int tcp_ao_del_cmd(struct sock *sk, unsigned short int family,
* "It is presumed that an MKT affecting a particular
* connection cannot be destroyed during an active connection"
*/
hlist_for_each_entry_rcu(key, &ao_info->head, node) {
hlist_for_each_entry_rcu(key, &ao_info->head, node,
lockdep_sock_is_held(sk)) {
if (cmd.sndid != key->sndid ||
cmd.rcvid != key->rcvid)
continue;
@ -2000,14 +2002,14 @@ static int tcp_ao_info_cmd(struct sock *sk, unsigned short int family,
* if there's any.
*/
if (cmd.set_current) {
new_current = tcp_ao_established_key(ao_info, cmd.current_key, -1);
new_current = tcp_ao_established_key(sk, ao_info, cmd.current_key, -1);
if (!new_current) {
err = -ENOENT;
goto out;
}
}
if (cmd.set_rnext) {
new_rnext = tcp_ao_established_key(ao_info, -1, cmd.rnext);
new_rnext = tcp_ao_established_key(sk, ao_info, -1, cmd.rnext);
if (!new_rnext) {
err = -ENOENT;
goto out;
@ -2101,7 +2103,8 @@ int tcp_v4_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen)
* The layout of the fields in the user and kernel structures is expected to
* be the same (including in the 32bit vs 64bit case).
*/
static int tcp_ao_copy_mkts_to_user(struct tcp_ao_info *ao_info,
static int tcp_ao_copy_mkts_to_user(const struct sock *sk,
struct tcp_ao_info *ao_info,
sockptr_t optval, sockptr_t optlen)
{
struct tcp_ao_getsockopt opt_in, opt_out;
@ -2229,7 +2232,8 @@ static int tcp_ao_copy_mkts_to_user(struct tcp_ao_info *ao_info,
/* May change in RX, while we're dumping, pre-fetch it */
current_key = READ_ONCE(ao_info->current_key);
hlist_for_each_entry_rcu(key, &ao_info->head, node) {
hlist_for_each_entry_rcu(key, &ao_info->head, node,
lockdep_sock_is_held(sk)) {
if (opt_in.get_all)
goto match;
@ -2309,7 +2313,7 @@ int tcp_ao_get_mkts(struct sock *sk, sockptr_t optval, sockptr_t optlen)
if (!ao_info)
return -ENOENT;
return tcp_ao_copy_mkts_to_user(ao_info, optval, optlen);
return tcp_ao_copy_mkts_to_user(sk, ao_info, optval, optlen);
}
int tcp_ao_get_sock_info(struct sock *sk, sockptr_t optval, sockptr_t optlen)
@ -2396,7 +2400,7 @@ int tcp_ao_set_repair(struct sock *sk, sockptr_t optval, unsigned int optlen)
WRITE_ONCE(ao->snd_sne, cmd.snd_sne);
WRITE_ONCE(ao->rcv_sne, cmd.rcv_sne);
hlist_for_each_entry_rcu(key, &ao->head, node)
hlist_for_each_entry_rcu(key, &ao->head, node, lockdep_sock_is_held(sk))
tcp_ao_cache_traffic_keys(sk, ao, key);
return 0;

3
net/ipv4/tcp_ipv4.c
View File

@ -1053,7 +1053,8 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
}
if (aoh)
key.ao_key = tcp_ao_established_key(ao_info, aoh->rnext_keyid, -1);
key.ao_key = tcp_ao_established_key(sk, ao_info,
aoh->rnext_keyid, -1);
}
}
if (key.ao_key) {

4
net/ipv6/tcp_ipv6.c
View File

@ -1172,8 +1172,8 @@ static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh))
goto out;
if (aoh)
key.ao_key = tcp_ao_established_key(ao_info,
aoh->rnext_keyid, -1);
key.ao_key = tcp_ao_established_key(sk, ao_info,
aoh->rnext_keyid, -1);
}
}
if (key.ao_key) {