[PATCH 1/3] batman-adv: Do not send uninitialized TT changes
From: Simon Wunderlich <sw@simonwunderlich.de>
Date: 2024-12-10 13:50:37
Also in:
batman
Subsystem:
batman advanced, the rest · Maintainers:
Marek Lindner, Simon Wunderlich, Antonio Quartulli, Sven Eckelmann, Linus Torvalds
From: Remi Pommarel <redacted>
The number of TT changes can be less than initially expected in
batadv_tt_tvlv_container_update() (changes can be removed by
batadv_tt_local_event() in ADD+DEL sequence between reading
tt_diff_entries_num and actually iterating the change list under lock).
Thus tt_diff_len could be bigger than the actual changes size that need
to be sent. Because batadv_send_my_tt_response sends the whole
packet, uninitialized data can be interpreted as TT changes on other
nodes leading to weird TT global entries on those nodes such as:
* 00:00:00:00:00:00 -1 [....] ( 0) 88:12:4e:ad:7e:ba (179) (0x45845380)
* 00:00:00:00:78:79 4092 [.W..] ( 0) 88:12:4e:ad:7e:3c (145) (0x8ebadb8b)
All of the above also applies to OGM tvlv container buffer's tvlv_len.
Remove the extra allocated space to avoid sending uninitialized TT
changes in batadv_send_my_tt_response() and batadv_v_ogm_send_softif().
Fixes: e1bf0c14096f ("batman-adv: tvlv - convert tt data sent within OGMs")
Signed-off-by: Remi Pommarel <redacted>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
---
net/batman-adv/translation-table.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index b44c382226a1..996d1f01171a 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c@@ -948,6 +948,7 @@ static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv) int tt_diff_len, tt_change_len = 0; int tt_diff_entries_num = 0; int tt_diff_entries_count = 0; + size_t tt_extra_len = 0; u16 tvlv_len; tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
@@ -985,6 +986,9 @@ static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv) } spin_unlock_bh(&bat_priv->tt.changes_list_lock); + tt_extra_len = batadv_tt_len(tt_diff_entries_num - + tt_diff_entries_count); + /* Keep the buffer for possible tt_request */ spin_lock_bh(&bat_priv->tt.last_changeset_lock); kfree(bat_priv->tt.last_changeset);
@@ -993,6 +997,7 @@ static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv) tt_change_len = batadv_tt_len(tt_diff_entries_count); /* check whether this new OGM has no changes due to size problems */ if (tt_diff_entries_count > 0) { + tt_diff_len -= tt_extra_len; /* if kmalloc() fails we will reply with the full table * instead of providing the diff */
@@ -1005,6 +1010,8 @@ static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv) } spin_unlock_bh(&bat_priv->tt.last_changeset_lock); + /* Remove extra packet space for OGM */ + tvlv_len -= tt_extra_len; container_register: batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data, tvlv_len);
--
2.39.5