This is a note to let you know that I've just added the patch titled
macvlan: enforce a consistent minimal mtu
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
macvlan-enforce-a-consistent-minimal-mtu.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b64085b00044bdf3cd1c9825e9ef5b2e0feae91a Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Fri, 7 Oct 2022 15:57:43 -0700
Subject: macvlan: enforce a consistent minimal mtu
From: Eric Dumazet <edumazet@xxxxxxxxxx>
commit b64085b00044bdf3cd1c9825e9ef5b2e0feae91a upstream.
macvlan should enforce a minimal mtu of 68, even at link creation.
This patch avoids the current behavior (which could lead to crashes
in ipv6 stack if the link is brought up)
$ ip link add macvlan1 link eno1 mtu 8 type macvlan # This should fail !
$ ip link sh dev macvlan1
5: macvlan1@eno1: <BROADCAST,MULTICAST> mtu 8 qdisc noop
state DOWN mode DEFAULT group default qlen 1000
link/ether 02:47:6c:24:74:82 brd ff:ff:ff:ff:ff:ff
$ ip link set macvlan1 mtu 67
Error: mtu less than device minimum.
$ ip link set macvlan1 mtu 68
$ ip link set macvlan1 mtu 8
Error: mtu less than device minimum.
Fixes: 91572088e3fd ("net: use core MTU range checking in core net infra")
Reported-by: syzbot <syzkaller@xxxxxxxxxxxxxxxx>
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/macvlan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1176,7 +1176,7 @@ void macvlan_common_setup(struct net_dev
{
ether_setup(dev);
- dev->min_mtu = 0;
+ /* ether_setup() has set dev->min_mtu to ETH_MIN_MTU. */
dev->max_mtu = ETH_MAX_MTU;
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
netif_keep_dst(dev);
Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are
queue-5.10/kcm-avoid-potential-race-in-kcm_tx_work.patch
queue-5.10/mm-fs-initialize-fsdata-passed-to-write_begin-write_end-interface.patch
queue-5.10/macvlan-enforce-a-consistent-minimal-mtu.patch
queue-5.10/tcp-cdg-allow-tcp_cdg_release-to-be-called-multiple-times.patch
queue-5.10/bpf-test_run-fix-alignment-problem-in-bpf_prog_test_.patch
