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Date: Thu, 22 Feb 2024 16:48:51 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>, Jiri Pirko <jiri@...dia.com>,
Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Subject: [PATCH net] dpll: rely on rcu for netdev_dpll_pin()
This fixes a possible UAF in if_nlmsg_size(),
which can run without RTNL.
Add rcu protection to "struct dpll_pin"
Note: This looks possible to no longer acquire RTNL in
netdev_dpll_pin_assign().
Fixes: 5f1842692880 ("netdev: expose DPLL pin handle for netdevice")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Jiri Pirko <jiri@...dia.com>
Cc: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
Cc: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
---
drivers/dpll/dpll_core.c | 2 +-
drivers/dpll/dpll_core.h | 2 ++
include/linux/dpll.h | 11 +++++++++++
include/linux/netdevice.h | 11 +----------
net/core/dev.c | 2 +-
net/core/rtnetlink.c | 2 ++
6 files changed, 18 insertions(+), 12 deletions(-)
diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c
index 5152bd1b0daf599869195e81805fbb2709dbe6b4..4c2bb27c99fe4e517b0d92c4ae3db83a679c7d11 100644
--- a/drivers/dpll/dpll_core.c
+++ b/drivers/dpll/dpll_core.c
@@ -564,7 +564,7 @@ void dpll_pin_put(struct dpll_pin *pin)
xa_destroy(&pin->parent_refs);
xa_erase(&dpll_pin_xa, pin->id);
dpll_pin_prop_free(&pin->prop);
- kfree(pin);
+ kfree_rcu(pin, rcu);
}
mutex_unlock(&dpll_lock);
}
diff --git a/drivers/dpll/dpll_core.h b/drivers/dpll/dpll_core.h
index 717f715015c742238d5585fddc5cd267fbb0db9f..2b6d8ef1cdf36cff24328e497c49d667659dd0e6 100644
--- a/drivers/dpll/dpll_core.h
+++ b/drivers/dpll/dpll_core.h
@@ -47,6 +47,7 @@ struct dpll_device {
* @prop: pin properties copied from the registerer
* @rclk_dev_name: holds name of device when pin can recover clock from it
* @refcount: refcount
+ * @rcu: rcu_head for kfree_rcu()
**/
struct dpll_pin {
u32 id;
@@ -57,6 +58,7 @@ struct dpll_pin {
struct xarray parent_refs;
struct dpll_pin_properties prop;
refcount_t refcount;
+ struct rcu_head rcu;
};
/**
diff --git a/include/linux/dpll.h b/include/linux/dpll.h
index 9cf896ea1d4122f3bc7094e46a5af81b999937dc..4ec2fe9caf5a3f284afd0cfe4fc7c2bf42cbbc60 100644
--- a/include/linux/dpll.h
+++ b/include/linux/dpll.h
@@ -10,6 +10,8 @@
#include <uapi/linux/dpll.h>
#include <linux/device.h>
#include <linux/netlink.h>
+#include <linux/netdevice.h>
+#include <linux/rtnetlink.h>
struct dpll_device;
struct dpll_pin;
@@ -167,4 +169,13 @@ int dpll_device_change_ntf(struct dpll_device *dpll);
int dpll_pin_change_ntf(struct dpll_pin *pin);
+static inline struct dpll_pin *netdev_dpll_pin(const struct net_device *dev)
+{
+#if IS_ENABLED(CONFIG_DPLL)
+ return rcu_dereference_rtnl(dev->dpll_pin);
+#else
+ return NULL;
+#endif
+}
+
#endif
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index ef7bfbb9849733fa7f1f097ba53a36a68cc3384b..a9c973b92294bb110cf3cd336485972127b01b58 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2469,7 +2469,7 @@ struct net_device {
struct devlink_port *devlink_port;
#if IS_ENABLED(CONFIG_DPLL)
- struct dpll_pin *dpll_pin;
+ struct dpll_pin __rcu *dpll_pin;
#endif
#if IS_ENABLED(CONFIG_PAGE_POOL)
/** @page_pools: page pools created for this netdevice */
@@ -4035,15 +4035,6 @@ bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b);
void netdev_dpll_pin_set(struct net_device *dev, struct dpll_pin *dpll_pin);
void netdev_dpll_pin_clear(struct net_device *dev);
-static inline struct dpll_pin *netdev_dpll_pin(const struct net_device *dev)
-{
-#if IS_ENABLED(CONFIG_DPLL)
- return dev->dpll_pin;
-#else
- return NULL;
-#endif
-}
-
struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again);
struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
struct netdev_queue *txq, int *ret);
diff --git a/net/core/dev.c b/net/core/dev.c
index 73a0219730075e666c4f11f668a50dbf9f9afa97..0230391c78f71e22d3c0e925ff8d3d792aa54a32 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -9078,7 +9078,7 @@ static void netdev_dpll_pin_assign(struct net_device *dev, struct dpll_pin *dpll
{
#if IS_ENABLED(CONFIG_DPLL)
rtnl_lock();
- dev->dpll_pin = dpll_pin;
+ rcu_assign_pointer(dev->dpll_pin, dpll_pin);
rtnl_unlock();
#endif
}
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 9c4f427f3a5057b52ec05405e8b15b8ca2246b4b..6239aa62a29cb8752a53e3f75a48a1e2fdd3b0ec 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1057,7 +1057,9 @@ static size_t rtnl_dpll_pin_size(const struct net_device *dev)
{
size_t size = nla_total_size(0); /* nest IFLA_DPLL_PIN */
+ rcu_read_lock();
size += dpll_msg_pin_handle_size(netdev_dpll_pin(dev));
+ rcu_read_unlock();
return size;
}
--
2.44.0.rc1.240.g4c46232300-goog
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