syzbot


KMSAN: uninit-value in tipc_nl_node_reset_link_stats

Status: fixed on 2023/12/21 03:45
Subsystems: tipc
[Documentation on labels]
Reported-by: syzbot+5138ca807af9d2b42574@syzkaller.appspotmail.com
Fix commit: 19b3f72a41a8 tipc: Change nla_policy for bearer-related names to NLA_NUL_STRING
First crash: 255d, last: 241d
Discussions (4)
Title Replies (including bot) Last reply
[PATCH net v3] tipc: Change nla_policy for bearer-related names to NLA_NUL_STRING 3 (3) 2023/11/02 05:51
[PATCH net v2] tipc: Fix uninit-value access in tipc_nl_node_reset_link_stats() 3 (3) 2023/10/24 14:19
[PATCH] tipc: Fix uninit-value access in tipc_nl_node_reset_link_stats() 5 (5) 2023/10/04 16:39
[syzbot] [tipc?] KMSAN: uninit-value in tipc_nl_node_reset_link_stats 0 (1) 2023/09/21 09:36
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in __tipc_nl_bearer_enable tipc C 1288 460d 1988d 22/26 fixed on 2023/02/24 13:50
Last patch testing requests (5)
Created Duration User Patch Repo Result
2023/10/30 00:29 29m syoshida@redhat.com patch upstream OK log
2023/10/19 16:34 25m syoshida@redhat.com patch upstream OK log
2023/10/19 15:56 25m syoshida@redhat.com patch upstream OK log
2023/09/30 15:30 17m retest repro upstream report log
2023/09/24 05:01 29m syoshida@redhat.com patch upstream OK log

Sample crash report:
=====================================================
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

CPU: 0 PID: 4999 Comm: syz-executor394 Not tainted 6.6.0-rc1-syzkaller-00125-ge42bebf6db29 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
=====================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/16 09:56 upstream e42bebf6db29 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in tipc_nl_node_reset_link_stats
2023/09/16 08:22 upstream e42bebf6db29 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in tipc_nl_node_reset_link_stats
* Struck through repros no longer work on HEAD.