diff options
author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2023-06-14 22:47:04 +0300 |
---|---|---|
committer | Jakub Kicinski <kuba@kernel.org> | 2023-06-16 01:08:58 +0300 |
commit | be28c14ac8bbe1ff0b2a18a06cd10981f90fc741 (patch) | |
tree | 489cc506387d49ff33a1b1e8ed21ad050111245c /net/ipv4 | |
parent | 9a36e2d44d122fe73a2a76ba73f1d50a65cf8210 (diff) | |
download | linux-be28c14ac8bbe1ff0b2a18a06cd10981f90fc741.tar.xz |
udplite: Print deprecation notice.
Recently syzkaller reported a 7-year-old null-ptr-deref [0] that occurs
when a UDP-Lite socket tries to allocate a buffer under memory pressure.
Someone should have stumbled on the bug much earlier if UDP-Lite had been
used in a real app. Also, we do not always need a large UDP-Lite workload
to hit the bug since UDP and UDP-Lite share the same memory accounting
limit.
Removing UDP-Lite would simplify UDP code removing a bunch of conditionals
in fast path.
Let's add a deprecation notice when UDP-Lite socket is created and schedule
its removal to 2025.
Link: https://lore.kernel.org/netdev/20230523163305.66466-1-kuniyu@amazon.com/ [0]
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv4')
-rw-r--r-- | net/ipv4/udplite.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite.c index 56d94d23b9e0..143f93a12f25 100644 --- a/net/ipv4/udplite.c +++ b/net/ipv4/udplite.c @@ -22,6 +22,8 @@ static int udplite_sk_init(struct sock *sk) { udp_init_sock(sk); udp_sk(sk)->pcflag = UDPLITE_BIT; + pr_warn_once("UDP-Lite is deprecated and scheduled to be removed in 2025, " + "please contact the netdev mailing list\n"); return 0; } |