Commit 51454ea4 authored by Niels Dossche's avatar Niels Dossche Committed by Jakub Kicinski

ipv6: fix locking issues with loops over idev->addr_list

idev->addr_list needs to be protected by idev->lock. However, it is not
always possible to do so while iterating and performing actions on
inet6_ifaddr instances. For example, multiple functions (like
addrconf_{join,leave}_anycast) eventually call down to other functions
that acquire the idev->lock. The current code temporarily unlocked the
idev->lock during the loops, which can cause race conditions. Moving the
locks up is also not an appropriate solution as the ordering of lock
acquisition will be inconsistent with for example mc_lock.

This solution adds an additional field to inet6_ifaddr that is used
to temporarily add the instances to a temporary list while holding
idev->lock. The temporary list can then be traversed without holding
idev->lock. This change was done in two places. In addrconf_ifdown, the
list_for_each_entry_safe variant of the list loop is also no longer
necessary as there is no deletion within that specific loop.
Suggested-by: default avatarPaolo Abeni <pabeni@redhat.com>
Signed-off-by: default avatarNiels Dossche <dossche.niels@gmail.com>
Acked-by: default avatarPaolo Abeni <pabeni@redhat.com>
Link: https://lore.kernel.org/r/20220403231523.45843-1-dossche.niels@gmail.comSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 8dd7cdb0
......@@ -64,6 +64,14 @@ struct inet6_ifaddr {
struct hlist_node addr_lst;
struct list_head if_list;
/*
* Used to safely traverse idev->addr_list in process context
* if the idev->lock needed to protect idev->addr_list cannot be held.
* In that case, add the items to this list temporarily and iterate
* without holding idev->lock.
* See addrconf_ifdown and dev_forward_change.
*/
struct list_head if_list_aux;
struct list_head tmp_list;
struct inet6_ifaddr *ifpub;
......
......@@ -797,6 +797,7 @@ static void dev_forward_change(struct inet6_dev *idev)
{
struct net_device *dev;
struct inet6_ifaddr *ifa;
LIST_HEAD(tmp_addr_list);
if (!idev)
return;
......@@ -815,14 +816,24 @@ static void dev_forward_change(struct inet6_dev *idev)
}
}
read_lock_bh(&idev->lock);
list_for_each_entry(ifa, &idev->addr_list, if_list) {
if (ifa->flags&IFA_F_TENTATIVE)
continue;
list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
}
read_unlock_bh(&idev->lock);
while (!list_empty(&tmp_addr_list)) {
ifa = list_first_entry(&tmp_addr_list,
struct inet6_ifaddr, if_list_aux);
list_del(&ifa->if_list_aux);
if (idev->cnf.forwarding)
addrconf_join_anycast(ifa);
else
addrconf_leave_anycast(ifa);
}
inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
NETCONFA_FORWARDING,
dev->ifindex, &idev->cnf);
......@@ -3728,7 +3739,8 @@ static int addrconf_ifdown(struct net_device *dev, bool unregister)
unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
struct net *net = dev_net(dev);
struct inet6_dev *idev;
struct inet6_ifaddr *ifa, *tmp;
struct inet6_ifaddr *ifa;
LIST_HEAD(tmp_addr_list);
bool keep_addr = false;
bool was_ready;
int state, i;
......@@ -3820,16 +3832,23 @@ static int addrconf_ifdown(struct net_device *dev, bool unregister)
write_lock_bh(&idev->lock);
}
list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
list_for_each_entry(ifa, &idev->addr_list, if_list)
list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
write_unlock_bh(&idev->lock);
while (!list_empty(&tmp_addr_list)) {
struct fib6_info *rt = NULL;
bool keep;
ifa = list_first_entry(&tmp_addr_list,
struct inet6_ifaddr, if_list_aux);
list_del(&ifa->if_list_aux);
addrconf_del_dad_work(ifa);
keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
!addr_is_local(&ifa->addr);
write_unlock_bh(&idev->lock);
spin_lock_bh(&ifa->lock);
if (keep) {
......@@ -3860,15 +3879,14 @@ static int addrconf_ifdown(struct net_device *dev, bool unregister)
addrconf_leave_solict(ifa->idev, &ifa->addr);
}
write_lock_bh(&idev->lock);
if (!keep) {
write_lock_bh(&idev->lock);
list_del_rcu(&ifa->if_list);
write_unlock_bh(&idev->lock);
in6_ifa_put(ifa);
}
}
write_unlock_bh(&idev->lock);
/* Step 5: Discard anycast and multicast list */
if (unregister) {
ipv6_ac_destroy_dev(idev);
......
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