KMSAN: uninit-value in __tipc_nl_bearer

KMSAN: uninit-value in __tipc_nl_bearer_enable
Status: upstream: reported syz repro on 2018/12/18 13:01
Reported-by: syzbot+e820fdc8ce362f2dea51@syzkaller.appspotmail.com
First crash: 949d, last: 8d12h

Sample crash report:

IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
==================================================================
BUG: KMSAN: uninit-value in strncpy+0x265/0x590 lib/string.c:119
CPU: 0 PID: 10931 Comm: syz-executor.1 Not tainted 5.0.0+ #17
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x173/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x131/0x2a0 mm/kmsan/kmsan.c:624
 __msan_warning+0x7a/0xf0 mm/kmsan/kmsan_instr.c:310
 strncpy+0x265/0x590 lib/string.c:119
 bearer_name_validate net/tipc/bearer.c:143 [inline]
 tipc_enable_bearer net/tipc/bearer.c:248 [inline]
 __tipc_nl_bearer_enable+0x674/0x1d50 net/tipc/bearer.c:899
 tipc_nl_bearer_enable+0x6c/0xb0 net/tipc/bearer.c:907
 genl_family_rcv_msg net/netlink/genetlink.c:601 [inline]
 genl_rcv_msg+0x185f/0x1a60 net/netlink/genetlink.c:626
 netlink_rcv_skb+0x431/0x620 net/netlink/af_netlink.c:2477
 genl_rcv+0x63/0x80 net/netlink/genetlink.c:637
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0xf3e/0x1020 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0x127f/0x1300 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg net/socket.c:632 [inline]
 ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2115
 __sys_sendmsg net/socket.c:2153 [inline]
 __do_sys_sendmsg net/socket.c:2162 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2160
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2160
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x458209
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8ebbd81c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458209
RDX: 0000000000000000 RSI: 0000000020000480 RDI: 0000000000000006
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8ebbd826d4
R13: 00000000004c55e1 R14: 00000000004d9478 R15: 00000000ffffffff

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline]
 kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:159
 kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:173
 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:182
 slab_post_alloc_hook mm/slab.h:445 [inline]
 slab_alloc_node mm/slub.c:2773 [inline]
 __kmalloc_node_track_caller+0xe9e/0xff0 mm/slub.c:4398
 __kmalloc_reserve net/core/skbuff.c:140 [inline]
 __alloc_skb+0x309/0xa20 net/core/skbuff.c:208
 alloc_skb include/linux/skbuff.h:1012 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline]
 netlink_sendmsg+0xb82/0x1300 net/netlink/af_netlink.c:1892
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg net/socket.c:632 [inline]
 ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2115
 __sys_sendmsg net/socket.c:2153 [inline]
 __do_sys_sendmsg net/socket.c:2162 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2160
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2160
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================

Crashes (901):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	VM info	Title
ci-upstream-kmsan-gce	2019/03/27 01:46	https://github.com/google/kmsan.git master	3c26d882e695	55684ce1	.config	log	report	syz
ci-upstream-kmsan-gce	2019/03/23 11:35	https://github.com/google/kmsan.git master	c10a026b8dee	3361bde5	.config	log	report	syz
ci-upstream-kmsan-gce	2019/03/21 01:12	https://github.com/google/kmsan.git master	c10a026b8dee	a664c187	.config	log	report	syz
ci-upstream-kmsan-gce	2019/02/07 15:30	https://github.com/google/kmsan.git master	fa1981bee40f	aa4feb03	.config	log	report	syz
ci-upstream-kmsan-gce	2019/02/02 18:09	https://github.com/google/kmsan.git master	fa1981bee40f	c198d5dd	.config	log	report	syz
ci-upstream-kmsan-gce	2019/01/06 08:01	https://github.com/google/kmsan.git master	11587f6ee534	53be0a37	.config	log	report	syz
ci-upstream-kmsan-gce	2019/01/01 20:33	https://github.com/google/kmsan.git master	8ba10281f9e5	3d85f48c	.config	log	report	syz
ci-upstream-kmsan-gce	2019/01/01 13:00	https://github.com/google/kmsan.git master	8ba10281f9e5	3d85f48c	.config	log	report	syz
ci-upstream-kmsan-gce	2018/12/26 09:42	https://github.com/google/kmsan.git master	79fc24ff6184	8a41a0ad	.config	log	report	syz
ci-upstream-kmsan-gce	2018/12/18 09:44	https://github.com/google/kmsan.git master	0a602458c72c	def91db3	.config	log	report	syz
ci-upstream-kmsan-gce	2021/07/15 21:31	https://github.com/google/kmsan.git master	57b5797c8013	b9a2f64e	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/07/15 02:34	https://github.com/google/kmsan.git master	57b5797c8013	94e0b707	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/07/13 21:57	https://github.com/google/kmsan.git master	57b5797c8013	fa0594c3	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/07/11 18:59	https://github.com/google/kmsan.git master	57b5797c8013	8f5a7b8c	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/07/06 11:38	https://github.com/google/kmsan.git master	57b5797c8013	6c4484eb	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/07/06 04:22	https://github.com/google/kmsan.git master	57b5797c8013	55aa55c2	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/07/06 02:20	https://github.com/google/kmsan.git master	57b5797c8013	55aa55c2	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/07/06 01:03	https://github.com/google/kmsan.git master	57b5797c8013	55aa55c2	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/07/05 21:05	https://github.com/google/kmsan.git master	57b5797c8013	55aa55c2	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/07/04 11:57	https://github.com/google/kmsan.git master	57b5797c8013	55aa55c2	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/29 06:11	https://github.com/google/kmsan.git master	57b5797c8013	9d2ab5df	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/28 21:00	https://github.com/google/kmsan.git master	57b5797c8013	9d2ab5df	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/27 18:18	https://github.com/google/kmsan.git master	57b5797c8013	9d2ab5df	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/27 06:48	https://github.com/google/kmsan.git master	57b5797c8013	9d2ab5df	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/25 06:33	https://github.com/google/kmsan.git master	a520ce29b172	0edbbe31	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/22 14:20	https://github.com/google/kmsan.git master	6a6a67f21dec	aba2b2fb	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/22 12:24	https://github.com/google/kmsan.git master	6a6a67f21dec	aba2b2fb	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/22 10:55	https://github.com/google/kmsan.git master	6a6a67f21dec	aba2b2fb	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/19 18:16	https://github.com/google/kmsan.git master	bfeba8b4c158	aba2b2fb	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/15 12:57	https://github.com/google/kmsan.git master	7bcc9a7be76b	58636922	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/15 11:55	https://github.com/google/kmsan.git master	7bcc9a7be76b	58636922	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/15 05:07	https://github.com/google/kmsan.git master	6099c9da2f7d	1ba81399	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/14 21:25	https://github.com/google/kmsan.git master	6099c9da2f7d	1ba81399	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/14 17:29	https://github.com/google/kmsan.git master	6099c9da2f7d	1ba81399	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/14 14:19	https://github.com/google/kmsan.git master	6099c9da2f7d	1ba81399	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/14 07:24	https://github.com/google/kmsan.git master	6099c9da2f7d	1ba81399	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/13 18:46	https://github.com/google/kmsan.git master	6099c9da2f7d	1ba81399	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/13 15:11	https://github.com/google/kmsan.git master	6099c9da2f7d	1ba81399	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/13 14:10	https://github.com/google/kmsan.git master	6099c9da2f7d	1ba81399	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/13 05:24	https://github.com/google/kmsan.git master	6099c9da2f7d	1ba81399	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/12 17:27	https://github.com/google/kmsan.git master	6099c9da2f7d	1ba81399	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/12 07:24	https://github.com/google/kmsan.git master	6099c9da2f7d	1ba81399	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/06/12 03:45	https://github.com/google/kmsan.git master	6099c9da2f7d	1ba81399	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/05/29 13:34	https://github.com/google/kmsan.git master	6099c9da2f7d	858ea628	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/05/27 10:55	https://github.com/google/kmsan.git master	6099c9da2f7d	858ea628	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce-386	2021/07/14 01:27	https://github.com/google/kmsan.git master	57b5797c8013	fa0594c3	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce-386	2021/07/14 00:26	https://github.com/google/kmsan.git master	57b5797c8013	fa0594c3	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce-386	2021/06/25 07:03	https://github.com/google/kmsan.git master	a520ce29b172	0edbbe31	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce-386	2021/06/23 01:54	https://github.com/google/kmsan.git master	6a6a67f21dec	aba2b2fb	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce-386	2021/06/12 21:15	https://github.com/google/kmsan.git master	6099c9da2f7d	1ba81399	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce-386	2021/06/05 18:38	https://github.com/google/kmsan.git master	6099c9da2f7d	500c2339	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce-386	2021/05/29 01:28	https://github.com/google/kmsan.git master	6099c9da2f7d	858ea628	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce-386	2021/05/28 00:02	https://github.com/google/kmsan.git master	6099c9da2f7d	858ea628	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2018/12/17 18:03	https://github.com/google/kmsan.git master	0a602458c72c	def91db3	.config	log	report
ci-upstream-kmsan-gce-386	2021/01/09 03:31	https://github.com/google/kmsan.git master	73d62e81b476	c104d4a3	.config	log	report		info