CVE-2022-49865

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network<br /> <br /> When copying a `struct ifaddrlblmsg` to the network, __ifal_reserved<br /> remained uninitialized, resulting in a 1-byte infoleak:<br /> <br /> BUG: KMSAN: kernel-network-infoleak in __netdev_start_xmit ./include/linux/netdevice.h:4841<br /> __netdev_start_xmit ./include/linux/netdevice.h:4841<br /> netdev_start_xmit ./include/linux/netdevice.h:4857<br /> xmit_one net/core/dev.c:3590<br /> dev_hard_start_xmit+0x1dc/0x800 net/core/dev.c:3606<br /> __dev_queue_xmit+0x17e8/0x4350 net/core/dev.c:4256<br /> dev_queue_xmit ./include/linux/netdevice.h:3009<br /> __netlink_deliver_tap_skb net/netlink/af_netlink.c:307<br /> __netlink_deliver_tap+0x728/0xad0 net/netlink/af_netlink.c:325<br /> netlink_deliver_tap net/netlink/af_netlink.c:338<br /> __netlink_sendskb net/netlink/af_netlink.c:1263<br /> netlink_sendskb+0x1d9/0x200 net/netlink/af_netlink.c:1272<br /> netlink_unicast+0x56d/0xf50 net/netlink/af_netlink.c:1360<br /> nlmsg_unicast ./include/net/netlink.h:1061<br /> rtnl_unicast+0x5a/0x80 net/core/rtnetlink.c:758<br /> ip6addrlbl_get+0xfad/0x10f0 net/ipv6/addrlabel.c:628<br /> rtnetlink_rcv_msg+0xb33/0x1570 net/core/rtnetlink.c:6082<br /> ...<br /> Uninit was created at:<br /> slab_post_alloc_hook+0x118/0xb00 mm/slab.h:742<br /> slab_alloc_node mm/slub.c:3398<br /> __kmem_cache_alloc_node+0x4f2/0x930 mm/slub.c:3437<br /> __do_kmalloc_node mm/slab_common.c:954<br /> __kmalloc_node_track_caller+0x117/0x3d0 mm/slab_common.c:975<br /> kmalloc_reserve net/core/skbuff.c:437<br /> __alloc_skb+0x27a/0xab0 net/core/skbuff.c:509<br /> alloc_skb ./include/linux/skbuff.h:1267<br /> nlmsg_new ./include/net/netlink.h:964<br /> ip6addrlbl_get+0x490/0x10f0 net/ipv6/addrlabel.c:608<br /> rtnetlink_rcv_msg+0xb33/0x1570 net/core/rtnetlink.c:6082<br /> netlink_rcv_skb+0x299/0x550 net/netlink/af_netlink.c:2540<br /> rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:6109<br /> netlink_unicast_kernel net/netlink/af_netlink.c:1319<br /> netlink_unicast+0x9ab/0xf50 net/netlink/af_netlink.c:1345<br /> netlink_sendmsg+0xebc/0x10f0 net/netlink/af_netlink.c:1921<br /> ...<br /> <br /> This patch ensures that the reserved field is always initialized.