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bonding: change ipsec_lock from spin lock to mutex
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In the cited commit, bond->ipsec_lock is added to protect ipsec_list,
hence xdo_dev_state_add and xdo_dev_state_delete are called inside
this lock. As ipsec_lock is a spin lock and such xfrmdev ops may sleep,
"scheduling while atomic" will be triggered when changing bond's
active slave.

[  101.055189] BUG: scheduling while atomic: bash/902/0x00000200
[  101.055726] Modules linked in:
[  101.058211] CPU: 3 PID: 902 Comm: bash Not tainted 6.9.0-rc4+ #1
[  101.058760] Hardware name:
[  101.059434] Call Trace:
[  101.059436]  <TASK>
[  101.060873]  dump_stack_lvl+0x51/0x60
[  101.061275]  __schedule_bug+0x4e/0x60
[  101.061682]  __schedule+0x612/0x7c0
[  101.062078]  ? __mod_timer+0x25c/0x370
[  101.062486]  schedule+0x25/0xd0
[  101.062845]  schedule_timeout+0x77/0xf0
[  101.063265]  ? asm_common_interrupt+0x22/0x40
[  101.063724]  ? __bpf_trace_itimer_state+0x10/0x10
[  101.064215]  __wait_for_common+0x87/0x190
[  101.064648]  ? usleep_range_state+0x90/0x90
[  101.065091]  cmd_exec+0x437/0xb20 [mlx5_core]
[  101.065569]  mlx5_cmd_do+0x1e/0x40 [mlx5_core]
[  101.066051]  mlx5_cmd_exec+0x18/0x30 [mlx5_core]
[  101.066552]  mlx5_crypto_create_dek_key+0xea/0x120 [mlx5_core]
[  101.067163]  ? bonding_sysfs_store_option+0x4d/0x80 [bonding]
[  101.067738]  ? kmalloc_trace+0x4d/0x350
[  101.068156]  mlx5_ipsec_create_sa_ctx+0x33/0x100 [mlx5_core]
[  101.068747]  mlx5e_xfrm_add_state+0x47b/0xaa0 [mlx5_core]
[  101.069312]  bond_change_active_slave+0x392/0x900 [bonding]
[  101.069868]  bond_option_active_slave_set+0x1c2/0x240 [bonding]
[  101.070454]  __bond_opt_set+0xa6/0x430 [bonding]
[  101.070935]  __bond_opt_set_notify+0x2f/0x90 [bonding]
[  101.071453]  bond_opt_tryset_rtnl+0x72/0xb0 [bonding]
[  101.071965]  bonding_sysfs_store_option+0x4d/0x80 [bonding]
[  101.072567]  kernfs_fop_write_iter+0x10c/0x1a0
[  101.073033]  vfs_write+0x2d8/0x400
[  101.073416]  ? alloc_fd+0x48/0x180
[  101.073798]  ksys_write+0x5f/0xe0
[  101.074175]  do_syscall_64+0x52/0x110
[  101.074576]  entry_SYSCALL_64_after_hwframe+0x4b/0x53

As bond_ipsec_add_sa_all and bond_ipsec_del_sa_all are only called
from bond_change_active_slave, which requires holding the RTNL lock.
And bond_ipsec_add_sa and bond_ipsec_del_sa are xfrm state
xdo_dev_state_add and xdo_dev_state_delete APIs, which are in user
context. So ipsec_lock doesn't have to be spin lock, change it to
mutex, and thus the above issue can be resolved.

Fixes: 9a56055 ("bonding: Add struct bond_ipesc to manage SA")
Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Jay Vosburgh <jv@jvosburgh.net>
Link: https://patch.msgid.link/20240823031056.110999-4-jianbol@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Jianbo Liu authored and kuba-moo committed Aug 27, 2024
1 parent 907ed83 commit 2aeeef9
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Showing 2 changed files with 44 additions and 37 deletions.
79 changes: 43 additions & 36 deletions drivers/net/bonding/bond_main.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -428,6 +428,7 @@ static int bond_ipsec_add_sa(struct xfrm_state *xs,
{
struct net_device *bond_dev = xs->xso.dev;
struct net_device *real_dev;
netdevice_tracker tracker;
struct bond_ipsec *ipsec;
struct bonding *bond;
struct slave *slave;
Expand All @@ -439,38 +440,41 @@ static int bond_ipsec_add_sa(struct xfrm_state *xs,
rcu_read_lock();
bond = netdev_priv(bond_dev);
slave = rcu_dereference(bond->curr_active_slave);
if (!slave) {
rcu_read_unlock();
return -ENODEV;
real_dev = slave ? slave->dev : NULL;
netdev_hold(real_dev, &tracker, GFP_ATOMIC);
rcu_read_unlock();
if (!real_dev) {
err = -ENODEV;
goto out;
}

real_dev = slave->dev;
if (!real_dev->xfrmdev_ops ||
!real_dev->xfrmdev_ops->xdo_dev_state_add ||
netif_is_bond_master(real_dev)) {
NL_SET_ERR_MSG_MOD(extack, "Slave does not support ipsec offload");
rcu_read_unlock();
return -EINVAL;
err = -EINVAL;
goto out;
}

ipsec = kmalloc(sizeof(*ipsec), GFP_ATOMIC);
ipsec = kmalloc(sizeof(*ipsec), GFP_KERNEL);
if (!ipsec) {
rcu_read_unlock();
return -ENOMEM;
err = -ENOMEM;
goto out;
}

xs->xso.real_dev = real_dev;
err = real_dev->xfrmdev_ops->xdo_dev_state_add(xs, extack);
if (!err) {
ipsec->xs = xs;
INIT_LIST_HEAD(&ipsec->list);
spin_lock_bh(&bond->ipsec_lock);
mutex_lock(&bond->ipsec_lock);
list_add(&ipsec->list, &bond->ipsec_list);
spin_unlock_bh(&bond->ipsec_lock);
mutex_unlock(&bond->ipsec_lock);
} else {
kfree(ipsec);
}
rcu_read_unlock();
out:
netdev_put(real_dev, &tracker);
return err;
}

Expand All @@ -481,35 +485,35 @@ static void bond_ipsec_add_sa_all(struct bonding *bond)
struct bond_ipsec *ipsec;
struct slave *slave;

rcu_read_lock();
slave = rcu_dereference(bond->curr_active_slave);
if (!slave)
goto out;
slave = rtnl_dereference(bond->curr_active_slave);
real_dev = slave ? slave->dev : NULL;
if (!real_dev)
return;

real_dev = slave->dev;
mutex_lock(&bond->ipsec_lock);
if (!real_dev->xfrmdev_ops ||
!real_dev->xfrmdev_ops->xdo_dev_state_add ||
netif_is_bond_master(real_dev)) {
spin_lock_bh(&bond->ipsec_lock);
if (!list_empty(&bond->ipsec_list))
slave_warn(bond_dev, real_dev,
"%s: no slave xdo_dev_state_add\n",
__func__);
spin_unlock_bh(&bond->ipsec_lock);
goto out;
}

spin_lock_bh(&bond->ipsec_lock);
list_for_each_entry(ipsec, &bond->ipsec_list, list) {
/* If new state is added before ipsec_lock acquired */
if (ipsec->xs->xso.real_dev == real_dev)
continue;

ipsec->xs->xso.real_dev = real_dev;
if (real_dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs, NULL)) {
slave_warn(bond_dev, real_dev, "%s: failed to add SA\n", __func__);
ipsec->xs->xso.real_dev = NULL;
}
}
spin_unlock_bh(&bond->ipsec_lock);
out:
rcu_read_unlock();
mutex_unlock(&bond->ipsec_lock);
}

/**
Expand All @@ -520,6 +524,7 @@ static void bond_ipsec_del_sa(struct xfrm_state *xs)
{
struct net_device *bond_dev = xs->xso.dev;
struct net_device *real_dev;
netdevice_tracker tracker;
struct bond_ipsec *ipsec;
struct bonding *bond;
struct slave *slave;
Expand All @@ -530,14 +535,16 @@ static void bond_ipsec_del_sa(struct xfrm_state *xs)
rcu_read_lock();
bond = netdev_priv(bond_dev);
slave = rcu_dereference(bond->curr_active_slave);
real_dev = slave ? slave->dev : NULL;
netdev_hold(real_dev, &tracker, GFP_ATOMIC);
rcu_read_unlock();

if (!slave)
goto out;

if (!xs->xso.real_dev)
goto out;

real_dev = slave->dev;
WARN_ON(xs->xso.real_dev != real_dev);

if (!real_dev->xfrmdev_ops ||
Expand All @@ -549,16 +556,16 @@ static void bond_ipsec_del_sa(struct xfrm_state *xs)

real_dev->xfrmdev_ops->xdo_dev_state_delete(xs);
out:
spin_lock_bh(&bond->ipsec_lock);
netdev_put(real_dev, &tracker);
mutex_lock(&bond->ipsec_lock);
list_for_each_entry(ipsec, &bond->ipsec_list, list) {
if (ipsec->xs == xs) {
list_del(&ipsec->list);
kfree(ipsec);
break;
}
}
spin_unlock_bh(&bond->ipsec_lock);
rcu_read_unlock();
mutex_unlock(&bond->ipsec_lock);
}

static void bond_ipsec_del_sa_all(struct bonding *bond)
Expand All @@ -568,15 +575,12 @@ static void bond_ipsec_del_sa_all(struct bonding *bond)
struct bond_ipsec *ipsec;
struct slave *slave;

rcu_read_lock();
slave = rcu_dereference(bond->curr_active_slave);
if (!slave) {
rcu_read_unlock();
slave = rtnl_dereference(bond->curr_active_slave);
real_dev = slave ? slave->dev : NULL;
if (!real_dev)
return;
}

real_dev = slave->dev;
spin_lock_bh(&bond->ipsec_lock);
mutex_lock(&bond->ipsec_lock);
list_for_each_entry(ipsec, &bond->ipsec_list, list) {
if (!ipsec->xs->xso.real_dev)
continue;
Expand All @@ -593,8 +597,7 @@ static void bond_ipsec_del_sa_all(struct bonding *bond)
real_dev->xfrmdev_ops->xdo_dev_state_free(ipsec->xs);
}
}
spin_unlock_bh(&bond->ipsec_lock);
rcu_read_unlock();
mutex_unlock(&bond->ipsec_lock);
}

static void bond_ipsec_free_sa(struct xfrm_state *xs)
Expand Down Expand Up @@ -5921,7 +5924,7 @@ void bond_setup(struct net_device *bond_dev)
/* set up xfrm device ops (only supported in active-backup right now) */
bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
INIT_LIST_HEAD(&bond->ipsec_list);
spin_lock_init(&bond->ipsec_lock);
mutex_init(&bond->ipsec_lock);
#endif /* CONFIG_XFRM_OFFLOAD */

/* don't acquire bond device's netif_tx_lock when transmitting */
Expand Down Expand Up @@ -5970,6 +5973,10 @@ static void bond_uninit(struct net_device *bond_dev)
__bond_release_one(bond_dev, slave->dev, true, true);
netdev_info(bond_dev, "Released all slaves\n");

#ifdef CONFIG_XFRM_OFFLOAD
mutex_destroy(&bond->ipsec_lock);
#endif /* CONFIG_XFRM_OFFLOAD */

bond_set_slave_arr(bond, NULL, NULL);

list_del_rcu(&bond->bond_list);
Expand Down
2 changes: 1 addition & 1 deletion include/net/bonding.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -260,7 +260,7 @@ struct bonding {
#ifdef CONFIG_XFRM_OFFLOAD
struct list_head ipsec_list;
/* protecting ipsec_list */
spinlock_t ipsec_lock;
struct mutex ipsec_lock;
#endif /* CONFIG_XFRM_OFFLOAD */
struct bpf_prog *xdp_prog;
};
Expand Down

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