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: 1129d, last: 2d07h

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KMSAN: uninit-value in strstr	C			42	23h22m	543d	0/22	upstream: reported C repro on 2020/07/25 18:13

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 (946):
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	2022/01/17 12:22	https://github.com/google/kmsan.git master	fa3879a274df	731a2d23	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2022/01/16 01:15	https://github.com/google/kmsan.git master	fa3879a274df	723cfaf0	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2022/01/15 21:13	https://github.com/google/kmsan.git master	fa3879a274df	723cfaf0	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2022/01/14 10:47	https://github.com/google/kmsan.git master	fa3879a274df	b8d780ab	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2022/01/07 21:08	https://github.com/google/kmsan.git master	81c325bbf94e	2ca0d385	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2022/01/07 11:46	https://github.com/google/kmsan.git master	81c325bbf94e	6acc789a	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2022/01/03 09:19	https://github.com/google/kmsan.git master	81c325bbf94e	e1768e9c	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/28 04:18	https://github.com/google/kmsan.git master	81c325bbf94e	6b3c5e64	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/25 09:00	https://github.com/google/kmsan.git master	81c325bbf94e	6caa12e4	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/22 18:25	https://github.com/google/kmsan.git master	81c325bbf94e	6caa12e4	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/18 18:52	https://github.com/google/kmsan.git master	b0a8b5053e8b	44068e19	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/18 17:08	https://github.com/google/kmsan.git master	b0a8b5053e8b	44068e19	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/17 21:38	https://github.com/google/kmsan.git master	b0a8b5053e8b	44068e19	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/16 11:11	https://github.com/google/kmsan.git master	cc9a49821cdb	572bcb40	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/15 02:10	https://github.com/google/kmsan.git master	b1e1bb6f7a2e	d018dd31	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/14 16:12	https://github.com/google/kmsan.git master	b1e1bb6f7a2e	d018dd31	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/14 15:56	https://github.com/google/kmsan.git master	b1e1bb6f7a2e	d018dd31	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/13 22:23	https://github.com/google/kmsan.git master	d82a8a8ca942	49ca1f59	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/07 17:01	https://github.com/google/kmsan.git master	8b936c96768e	0230ba3e	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/03 15:55	https://github.com/google/kmsan.git master	093998ececa3	c7c20675	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/12/02 20:31	https://github.com/google/kmsan.git master	a535b0caaa2f	61f86278	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/11/28 14:04	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/11/27 20:50	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/11/25 22:41	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/11/25 14:44	https://github.com/google/kmsan.git master	b05f62d953b9	545ab074	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/11/22 09:27	https://github.com/google/kmsan.git master	425295055ce6	4eb20a4e	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/11/20 19:29	https://github.com/google/kmsan.git master	425295055ce6	4eb20a4e	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce	2021/11/19 11:20	https://github.com/google/kmsan.git master	412af9cd936d	31a30fc0	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
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-386	2021/12/14 23:00	https://github.com/google/kmsan.git master	b1e1bb6f7a2e	d018dd31	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce-386	2021/12/14 19:41	https://github.com/google/kmsan.git master	b1e1bb6f7a2e	d018dd31	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce-386	2021/12/13 19:03	https://github.com/google/kmsan.git master	8b936c96768e	49ca1f59	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce-386	2021/12/07 06:26	https://github.com/google/kmsan.git master	cdfb223e7e63	0230ba3e	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce-386	2021/12/03 08:15	https://github.com/google/kmsan.git master	a535b0caaa2f	61f86278	.config	log	report		info	KMSAN: uninit-value in __tipc_nl_bearer_enable
ci-upstream-kmsan-gce-386	2021/11/26 04:42	https://github.com/google/kmsan.git master	a535b0caaa2f	63eeac02	.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	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