lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Tue, 14 Jan 2020 13:23:09 +0200
From:   Ido Schimmel <>
        Ido Schimmel <>
Subject: [PATCH net-next v2 01/10] ipv4: Replace route in list before notifying

From: Ido Schimmel <>

Subsequent patches will add an offload / trap indication to routes which
will signal if the route is present in hardware or not.

After programming the route to the hardware, drivers will have to ask
the IPv4 code to set the flags by passing the route's key.

In the case of route replace, the new route is notified before it is
actually inserted into the FIB alias list. This can prevent simple
drivers (e.g., netdevsim) that program the route to the hardware in the
same context it is notified in from being able to set the flag.

Solve this by first inserting the new route to the list and rollback the
operation in case the route was vetoed.

Signed-off-by: Ido Schimmel <>
Reviewed-by: Jiri Pirko <>
Reviewed-by: David Ahern <>
 net/ipv4/fib_trie.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index b92a42433a7d..39f56d68ec19 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1221,23 +1221,26 @@ int fib_table_insert(struct net *net, struct fib_table *tb,
 			new_fa->tb_id = tb->tb_id;
 			new_fa->fa_default = -1;
+			hlist_replace_rcu(&fa->fa_list, &new_fa->fa_list);
 			if (fib_find_alias(&l->leaf, fa->fa_slen, 0, 0,
-					   tb->tb_id, true) == fa) {
+					   tb->tb_id, true) == new_fa) {
 				enum fib_event_type fib_event;
 				fib_event = FIB_EVENT_ENTRY_REPLACE;
 				err = call_fib_entry_notifiers(net, fib_event,
 							       key, plen,
 							       new_fa, extack);
-				if (err)
+				if (err) {
+					hlist_replace_rcu(&new_fa->fa_list,
+							  &fa->fa_list);
 					goto out_free_new_fa;
+				}
 			rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen,
 				  tb->tb_id, &cfg->fc_nlinfo, nlflags);
-			hlist_replace_rcu(&fa->fa_list, &new_fa->fa_list);

Powered by blists - more mailing lists