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authorLinus Lüssing <linus.luessing@c0d3.blue>2015-06-16 18:10:26 +0300
committerAntonio Quartulli <antonio@meshcoding.com>2015-08-14 23:52:08 +0300
commit8a4023c5b5e30b11f1f383186f4a7222b3b823cf (patch)
tree47a3414f2843011b95fdad1c05e413c3957d050a /net/batman-adv/multicast.c
parent9c936e3f4c4fad07abb6c082a89508b8f724c88f (diff)
downloadlinux-8a4023c5b5e30b11f1f383186f4a7222b3b823cf.tar.xz
batman-adv: Fix potential synchronization issues in mcast tvlv handler
So far the mcast tvlv handler did not anticipate the processing of multiple incoming OGMs from the same originator at the same time. This can lead to various issues: * Broken refcounting: For instance two mcast handlers might both assume that an originator just got multicast capabilities and will together wrongly decrease mcast.num_disabled by two, potentially leading to an integer underflow. * Potential kernel panic on hlist_del_rcu(): Two mcast handlers might one after another try to do an hlist_del_rcu(&orig->mcast_want_all_*_node). The second one will cause memory corruption / crashes. (Reported by: Sven Eckelmann <sven@narfation.org>) Right in the beginning the code path makes assumptions about the current multicast related state of an originator and bases all updates on that. The easiest and least error prune way to fix the issues in this case is to serialize multiple mcast handler invocations with a spinlock. Fixes: 60432d756cf0 ("batman-adv: Announce new capability via multicast TVLV") Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
Diffstat (limited to 'net/batman-adv/multicast.c')
-rw-r--r--net/batman-adv/multicast.c63
1 files changed, 50 insertions, 13 deletions
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index 8f1ec21bf2d0..68a9554961eb 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -20,6 +20,7 @@
#include <linux/atomic.h>
#include <linux/bitops.h>
+#include <linux/bug.h>
#include <linux/byteorder/generic.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
@@ -589,19 +590,26 @@ batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
*
* If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator,
* orig, has toggled then this method updates counter and list accordingly.
+ *
+ * Caller needs to hold orig->mcast_handler_lock.
*/
static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
uint8_t mcast_flags)
{
+ struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node;
+ struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list;
+
/* switched from flag unset to set */
if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
!(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) {
atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
- hlist_add_head_rcu(&orig->mcast_want_all_unsnoopables_node,
- &bat_priv->mcast.want_all_unsnoopables_list);
+ /* flag checks above + mcast_handler_lock prevents this */
+ WARN_ON(!hlist_unhashed(node));
+
+ hlist_add_head_rcu(node, head);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
/* switched from flag set to unset */
} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) &&
@@ -609,7 +617,10 @@ static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv,
atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
- hlist_del_rcu(&orig->mcast_want_all_unsnoopables_node);
+ /* flag checks above + mcast_handler_lock prevents this */
+ WARN_ON(hlist_unhashed(node));
+
+ hlist_del_init_rcu(node);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
}
}
@@ -622,19 +633,26 @@ static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv,
*
* If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has
* toggled then this method updates counter and list accordingly.
+ *
+ * Caller needs to hold orig->mcast_handler_lock.
*/
static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
uint8_t mcast_flags)
{
+ struct hlist_node *node = &orig->mcast_want_all_ipv4_node;
+ struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list;
+
/* switched from flag unset to set */
if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 &&
!(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) {
atomic_inc(&bat_priv->mcast.num_want_all_ipv4);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
- hlist_add_head_rcu(&orig->mcast_want_all_ipv4_node,
- &bat_priv->mcast.want_all_ipv4_list);
+ /* flag checks above + mcast_handler_lock prevents this */
+ WARN_ON(!hlist_unhashed(node));
+
+ hlist_add_head_rcu(node, head);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
/* switched from flag set to unset */
} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) &&
@@ -642,7 +660,10 @@ static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv,
atomic_dec(&bat_priv->mcast.num_want_all_ipv4);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
- hlist_del_rcu(&orig->mcast_want_all_ipv4_node);
+ /* flag checks above + mcast_handler_lock prevents this */
+ WARN_ON(hlist_unhashed(node));
+
+ hlist_del_init_rcu(node);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
}
}
@@ -655,19 +676,26 @@ static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv,
*
* If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has
* toggled then this method updates counter and list accordingly.
+ *
+ * Caller needs to hold orig->mcast_handler_lock.
*/
static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
uint8_t mcast_flags)
{
+ struct hlist_node *node = &orig->mcast_want_all_ipv6_node;
+ struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list;
+
/* switched from flag unset to set */
if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 &&
!(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) {
atomic_inc(&bat_priv->mcast.num_want_all_ipv6);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
- hlist_add_head_rcu(&orig->mcast_want_all_ipv6_node,
- &bat_priv->mcast.want_all_ipv6_list);
+ /* flag checks above + mcast_handler_lock prevents this */
+ WARN_ON(!hlist_unhashed(node));
+
+ hlist_add_head_rcu(node, head);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
/* switched from flag set to unset */
} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) &&
@@ -675,7 +703,10 @@ static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv,
atomic_dec(&bat_priv->mcast.num_want_all_ipv6);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
- hlist_del_rcu(&orig->mcast_want_all_ipv6_node);
+ /* flag checks above + mcast_handler_lock prevents this */
+ WARN_ON(hlist_unhashed(node));
+
+ hlist_del_init_rcu(node);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
}
}
@@ -698,6 +729,11 @@ static void batadv_mcast_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
uint8_t mcast_flags = BATADV_NO_FLAGS;
bool orig_initialized;
+ if (orig_mcast_enabled && tvlv_value &&
+ (tvlv_value_len >= sizeof(mcast_flags)))
+ mcast_flags = *(uint8_t *)tvlv_value;
+
+ spin_lock_bh(&orig->mcast_handler_lock);
orig_initialized = test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
&orig->capa_initialized);
@@ -723,15 +759,12 @@ static void batadv_mcast_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized);
- if (orig_mcast_enabled && tvlv_value &&
- (tvlv_value_len >= sizeof(mcast_flags)))
- mcast_flags = *(uint8_t *)tvlv_value;
-
batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags);
batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags);
batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags);
orig->mcast_flags = mcast_flags;
+ spin_unlock_bh(&orig->mcast_handler_lock);
}
/**
@@ -765,6 +798,8 @@ void batadv_mcast_purge_orig(struct batadv_orig_node *orig)
{
struct batadv_priv *bat_priv = orig->bat_priv;
+ spin_lock_bh(&orig->mcast_handler_lock);
+
if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) &&
test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized))
atomic_dec(&bat_priv->mcast.num_disabled);
@@ -772,4 +807,6 @@ void batadv_mcast_purge_orig(struct batadv_orig_node *orig)
batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS);
batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS);
batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS);
+
+ spin_unlock_bh(&orig->mcast_handler_lock);
}