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Commit bfc01ddf authored by Steffen Klassert's avatar Steffen Klassert
Browse files

Revert "net: xfrm: Add '_rcu' tag for rcu protected pointer in netns_xfrm" 



This reverts commit f10e0010.

This commit was just wrong. It caused a lot of
syzbot warnings, so just revert it.

Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent 6ee02a54

include/net/netns/xfrm.h

+1 −1
Original line number Original line Diff line number Diff line
@@ -57,7 +57,7 @@ struct netns_xfrm { 
	struct list_head	inexact_bins;

	struct list_head	inexact_bins;









	struct sock		__rcu *nlsk;

	struct sock		*nlsk;

	struct sock		*nlsk_stash;

	struct sock		*nlsk_stash;





	u32			sysctl_aevent_etime;

	u32			sysctl_aevent_etime;

net/xfrm/xfrm_user.c

+7 −23
Original line number Original line Diff line number Diff line
@@ -1071,22 +1071,6 @@ static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, 
	return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);

	return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);

}

}





/* A similar wrapper like xfrm_nlmsg_multicast checking that nlsk is still

 * available.

 */

static inline int xfrm_nlmsg_unicast(struct net *net, struct sk_buff *skb,

				     u32 pid)

{

	struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);



	if (!nlsk) {

		kfree_skb(skb);

		return -EPIPE;

	}



	return nlmsg_unicast(nlsk, skb, pid);

}



static inline unsigned int xfrm_spdinfo_msgsize(void)

static inline unsigned int xfrm_spdinfo_msgsize(void)

{

{

	return NLMSG_ALIGN(4)

	return NLMSG_ALIGN(4)
@@ -1211,7 +1195,7 @@ static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 
	err = build_spdinfo(r_skb, net, sportid, seq, *flags);

	err = build_spdinfo(r_skb, net, sportid, seq, *flags);

	BUG_ON(err < 0);

	BUG_ON(err < 0);





	return xfrm_nlmsg_unicast(net, r_skb, sportid);

	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);

}

}





static inline unsigned int xfrm_sadinfo_msgsize(void)

static inline unsigned int xfrm_sadinfo_msgsize(void)
@@ -1270,7 +1254,7 @@ static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, 
	err = build_sadinfo(r_skb, net, sportid, seq, *flags);

	err = build_sadinfo(r_skb, net, sportid, seq, *flags);

	BUG_ON(err < 0);

	BUG_ON(err < 0);





	return xfrm_nlmsg_unicast(net, r_skb, sportid);

	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);

}

}





static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,

static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
@@ -1290,7 +1274,7 @@ static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 
	if (IS_ERR(resp_skb)) {

	if (IS_ERR(resp_skb)) {

		err = PTR_ERR(resp_skb);

		err = PTR_ERR(resp_skb);

	} else {

	} else {

		err = xfrm_nlmsg_unicast(net, resp_skb, NETLINK_CB(skb).portid);

		err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);

	}

	}

	xfrm_state_put(x);

	xfrm_state_put(x);

out_noput:

out_noput:
@@ -1353,7 +1337,7 @@ static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, 
		goto out;

		goto out;

	}

	}





	err = xfrm_nlmsg_unicast(net, resp_skb, NETLINK_CB(skb).portid);

	err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);





out:

out:

	xfrm_state_put(x);

	xfrm_state_put(x);
@@ -1919,7 +1903,7 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 
		if (IS_ERR(resp_skb)) {

		if (IS_ERR(resp_skb)) {

			err = PTR_ERR(resp_skb);

			err = PTR_ERR(resp_skb);

		} else {

		} else {

			err = xfrm_nlmsg_unicast(net, resp_skb,

			err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,

					    NETLINK_CB(skb).portid);

					    NETLINK_CB(skb).portid);

		}

		}

	} else {

	} else {
@@ -2078,7 +2062,7 @@ static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, 
	err = build_aevent(r_skb, x, &c);

	err = build_aevent(r_skb, x, &c);

	BUG_ON(err < 0);

	BUG_ON(err < 0);





	err = xfrm_nlmsg_unicast(net, r_skb, NETLINK_CB(skb).portid);

	err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);

	spin_unlock_bh(&x->lock);

	spin_unlock_bh(&x->lock);

	xfrm_state_put(x);

	xfrm_state_put(x);

	return err;

	return err;