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KMSAN: uninit-value in tipc_nl_compat_link_reset_stats

Status: fixed on 2019/03/06 07:43
Subsystems: tipc
[Documentation on labels]
Reported-by: syzbot+e01d94b5a4c266be6e4c@syzkaller.appspotmail.com
Fix commit: 8b66fee7f8ee tipc: fix uninit-value in tipc_nl_compat_link_reset_stats
First crash: 2147d, last: 2023d
▶ ▼ Discussions (7)
Title Replies (including bot) Last reply
[PATCH 4.19 00/99] 4.19.17-stable review 109 (109) 2019/04/22 19:40
[PATCH 4.4 000/104] 4.4.172-stable review 111 (111) 2019/01/30 07:30
[PATCH 4.14 00/59] 4.14.95-stable review 65 (65) 2019/01/23 12:55
[PATCH 4.9 00/51] 4.9.152-stable review 56 (56) 2019/01/23 09:06
[PATCH 4.20 000/111] 4.20.4-stable review 120 (120) 2019/01/23 06:43
[net 0/6] tipc: fix uninit-value issues reported by syzbot 8 (8) 2019/01/16 04:29
KMSAN: uninit-value in tipc_nl_compat_link_reset_stats 0 (1) 2019/01/07 13:47
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in tipc_nl_compat_link_reset_stats (2) tipc C 5 1919d 1972d 0/28 closed as invalid on 2022/11/07 15:00

Sample crash report:
hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network
IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
==================================================================
BUG: KMSAN: uninit-value in strlen+0x3b/0xa0 lib/string.c:486
CPU: 1 PID: 10597 Comm: syz-executor0 Not tainted 4.20.0-rc7+ #2
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+0x12e/0x2a0 mm/kmsan/kmsan.c:613
 __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
 strlen+0x3b/0xa0 lib/string.c:486
 nla_put_string include/net/netlink.h:1154 [inline]
 tipc_nl_compat_link_reset_stats+0x1f0/0x360 net/tipc/netlink_compat.c:760
 __tipc_nl_compat_doit net/tipc/netlink_compat.c:311 [inline]
 tipc_nl_compat_doit+0x3aa/0xaf0 net/tipc/netlink_compat.c:344
 tipc_nl_compat_handle net/tipc/netlink_compat.c:1107 [inline]
 tipc_nl_compat_recv+0x14d7/0x2760 net/tipc/netlink_compat.c:1210
 genl_family_rcv_msg net/netlink/genetlink.c:601 [inline]
 genl_rcv_msg+0x185f/0x1a60 net/netlink/genetlink.c:626
 netlink_rcv_skb+0x444/0x640 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+0xf40/0x1020 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0x127f/0x1300 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116
 __sys_sendmsg net/socket.c:2154 [inline]
 __do_sys_sendmsg net/socket.c:2163 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2161
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457ec9
Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb820335c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb8203366d4
R13: 00000000004cb660 R14: 00000000004d8aa0 R15: 00000000ffffffff

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:204 [inline]
 kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:158
 kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:176
 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:185
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2759 [inline]
 __kmalloc_node_track_caller+0xe18/0x1030 mm/slub.c:4383
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0x309/0xa20 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:998 [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:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116
 __sys_sendmsg net/socket.c:2154 [inline]
 __do_sys_sendmsg net/socket.c:2163 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2161
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================

Crashes (16):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/01/05 13:50 https://github.com/google/kmsan.git master 11587f6ee534 53be0a37 .config console log report syz ci-upstream-kmsan-gce
2019/01/04 07:26 https://github.com/google/kmsan.git master 68006459ade0 7da23925 .config console log report syz ci-upstream-kmsan-gce
2019/01/03 07:40 https://github.com/google/kmsan.git master 8ba10281f9e5 06a2b89f .config console log report syz ci-upstream-kmsan-gce
2019/03/02 00:07 https://github.com/google/kmsan.git master fa1981bee40f 68d9e495 .config console log report ci-upstream-kmsan-gce
2019/02/05 02:13 https://github.com/google/kmsan.git master fa1981bee40f d672172c .config console log report ci-upstream-kmsan-gce
2019/01/16 17:46 https://github.com/google/kmsan.git master 02f2d5aea531 d538790b .config console log report ci-upstream-kmsan-gce
2019/01/14 17:01 https://github.com/google/kmsan.git master 02f2d5aea531 95485883 .config console log report ci-upstream-kmsan-gce
2019/01/11 22:53 https://github.com/google/kmsan.git master 02f2d5aea531 c3f3344c .config console log report ci-upstream-kmsan-gce
2019/01/05 04:31 https://github.com/google/kmsan.git master 11587f6ee534 53be0a37 .config console log report ci-upstream-kmsan-gce
2019/01/04 00:16 https://github.com/google/kmsan.git master 68006459ade0 7da23925 .config console log report ci-upstream-kmsan-gce
2019/01/03 00:03 https://github.com/google/kmsan.git master 8ba10281f9e5 06a2b89f .config console log report ci-upstream-kmsan-gce
2018/12/25 12:57 https://github.com/google/kmsan.git master 79fc24ff6184 8a41a0ad .config console log report ci-upstream-kmsan-gce
2018/12/24 22:38 https://github.com/google/kmsan.git master 79fc24ff6184 8a41a0ad .config console log report ci-upstream-kmsan-gce
2018/12/16 20:29 https://github.com/google/kmsan.git master 0a602458c72c def91db3 .config console log report ci-upstream-kmsan-gce
2018/10/30 23:42 https://github.com/google/kmsan.git master cb4c1d77c7e1 8dbb755a .config console log report ci-upstream-kmsan-gce
2018/10/29 08:51 https://github.com/google/kmsan.git master 4bb25354f0b0 9ca2afa1 .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.