CVE-2023-52845

In the Linux kernel, the following vulnerability has been resolved: tipc:
Change nla_policy for bearer-related names to NLA_NUL_STRING syzbot
reported the following uninit-value access issue [1]:
===================================================== BUG: KMSAN:
uninit-value in strlen lib/string.c:418 [inline] BUG: KMSAN: uninit-value
in strstr+0xb8/0x2f0 lib/string.c:756 strlen lib/string.c:418 [inline]
strstr+0xb8/0x2f0 lib/string.c:756
tipc_nl_node_reset_link_stats+0x3ea/0xb50 net/tipc/node.c:2595
genl_family_rcv_msg_doit net/netlink/genetlink.c:971 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:1051 [inline]
genl_rcv_msg+0x11ec/0x1290 net/netlink/genetlink.c:1066
netlink_rcv_skb+0x371/0x650 net/netlink/af_netlink.c:2545
genl_rcv+0x40/0x60 net/netlink/genetlink.c:1075 netlink_unicast_kernel
net/netlink/af_netlink.c:1342 [inline] netlink_unicast+0xf47/0x1250
net/netlink/af_netlink.c:1368 netlink_sendmsg+0x1238/0x13d0
net/netlink/af_netlink.c:1910 sock_sendmsg_nosec net/socket.c:730 [inline]
sock_sendmsg net/socket.c:753 [inline] ____sys_sendmsg+0x9c2/0xd60
net/socket.c:2541 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2595
__sys_sendmsg net/socket.c:2624 [inline] __do_sys_sendmsg net/socket.c:2633
[inline] __se_sys_sendmsg net/socket.c:2631 [inline]
__x64_sys_sendmsg+0x307/0x490 net/socket.c:2631 do_syscall_x64
arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0
arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Uninit
was created at: slab_post_alloc_hook+0x12f/0xb70 mm/slab.h:767
slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x577/0xa80
mm/slub.c:3523 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:559
__alloc_skb+0x318/0x740 net/core/skbuff.c:650 alloc_skb
include/linux/skbuff.h:1286 [inline] netlink_alloc_large_skb
net/netlink/af_netlink.c:1214 [inline] netlink_sendmsg+0xb34/0x13d0
net/netlink/af_netlink.c:1885 sock_sendmsg_nosec net/socket.c:730 [inline]
sock_sendmsg net/socket.c:753 [inline] ____sys_sendmsg+0x9c2/0xd60
net/socket.c:2541 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2595
__sys_sendmsg net/socket.c:2624 [inline] __do_sys_sendmsg net/socket.c:2633
[inline] __se_sys_sendmsg net/socket.c:2631 [inline]
__x64_sys_sendmsg+0x307/0x490 net/socket.c:2631 do_syscall_x64
arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0
arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd TIPC
bearer-related names including link names must be null-terminated strings.
If a link name which is not null-terminated is passed through netlink,
strstr() and similar functions can cause buffer overrun. This causes the
above issue. This patch changes the nla_policy for bearer-related names
from NLA_STRING to NLA_NUL_STRING. This resolves the issue by ensuring that
only null-terminated strings are accepted as bearer-related names. syzbot
reported similar uninit-value issue related to bearer names [2]. The root
cause of this issue is that a non-null-terminated bearer name was passed.
This patch also resolved this issue.