syzbot


KMSAN: uninit-value in geneve_udp_encap_recv

Status: fixed on 2024/04/10 03:59
Subsystems: net
[Documentation on labels]
Fix commit: 1ca1ba465e55 geneve: make sure to pull inner header in geneve_rx()
First crash: 114d, last: 83d
Discussions (8)
Title Replies (including bot) Last reply
[PATCH 4.19 08/41] geneve: make sure to pull inner header in geneve_rx() 1 (1) 2024/03/13 17:04
[PATCH 5.4 07/51] geneve: make sure to pull inner header in geneve_rx() 1 (1) 2024/03/13 17:01
[PATCH 5.10 11/73] geneve: make sure to pull inner header in geneve_rx() 1 (1) 2024/03/13 16:45
[PATCH 5.15 07/76] geneve: make sure to pull inner header in geneve_rx() 1 (1) 2024/03/13 16:41
[PATCH 6.1 07/71] geneve: make sure to pull inner header in geneve_rx() 1 (1) 2024/03/13 16:38
[PATCH 6.6 23/60] geneve: make sure to pull inner header in geneve_rx() 1 (1) 2024/03/13 16:36
[PATCH 6.7 26/61] geneve: make sure to pull inner header in geneve_rx() 1 (1) 2024/03/13 16:32
[PATCH net] geneve: make sure to pull inner header in geneve_rx() 4 (4) 2024/03/04 10:00
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: kernel-infoleak in copyout (2) net C 6723 346d 1514d 22/26 fixed on 2023/06/08 14:41
upstream KMSAN: uninit-value in IP6_ECN_decapsulate net C 981 151d 2067d 25/26 fixed on 2023/12/21 03:45
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/02/28 16:38 1h02m edumazet@google.com patch upstream OK log

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in IP_ECN_decapsulate include/net/inet_ecn.h:302 [inline]
BUG: KMSAN: uninit-value in geneve_rx drivers/net/geneve.c:279 [inline]
BUG: KMSAN: uninit-value in geneve_udp_encap_recv+0x36f9/0x3c10 drivers/net/geneve.c:391
 IP_ECN_decapsulate include/net/inet_ecn.h:302 [inline]
 geneve_rx drivers/net/geneve.c:279 [inline]
 geneve_udp_encap_recv+0x36f9/0x3c10 drivers/net/geneve.c:391
 udp_queue_rcv_one_skb+0x1d39/0x1f20 net/ipv4/udp.c:2108
 udp_queue_rcv_skb+0x6ae/0x6e0 net/ipv4/udp.c:2186
 udp_unicast_rcv_skb+0x184/0x4b0 net/ipv4/udp.c:2346
 __udp4_lib_rcv+0x1c6b/0x3010 net/ipv4/udp.c:2422
 udp_rcv+0x7d/0xa0 net/ipv4/udp.c:2604
 ip_protocol_deliver_rcu+0x264/0x1300 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x2b8/0x440 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ip_local_deliver+0x21f/0x490 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:461 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:449 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ip_rcv+0x46f/0x760 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core net/core/dev.c:5534 [inline]
 __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5648
 process_backlog+0x480/0x8b0 net/core/dev.c:5976
 __napi_poll+0xe3/0x980 net/core/dev.c:6576
 napi_poll net/core/dev.c:6645 [inline]
 net_rx_action+0x8b8/0x1870 net/core/dev.c:6778
 __do_softirq+0x1b7/0x7c5 kernel/softirq.c:553
 do_softirq+0x9a/0xf0 kernel/softirq.c:454
 __local_bh_enable_ip+0x9b/0xa0 kernel/softirq.c:381
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:820 [inline]
 __dev_queue_xmit+0x2768/0x51c0 net/core/dev.c:4378
 dev_queue_xmit include/linux/netdevice.h:3171 [inline]
 packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3081 [inline]
 packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 __sys_sendto+0x735/0xa10 net/socket.c:2191
 __do_sys_sendto net/socket.c:2203 [inline]
 __se_sys_sendto net/socket.c:2199 [inline]
 __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:3819 [inline]
 slab_alloc_node mm/slub.c:3860 [inline]
 kmem_cache_alloc_node+0x5cb/0xbc0 mm/slub.c:3903
 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560
 __alloc_skb+0x352/0x790 net/core/skbuff.c:651
 alloc_skb include/linux/skbuff.h:1296 [inline]
 alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6394
 sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2783
 packet_alloc_skb net/packet/af_packet.c:2930 [inline]
 packet_snd net/packet/af_packet.c:3024 [inline]
 packet_sendmsg+0x70c2/0x9f10 net/packet/af_packet.c:3113
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 __sys_sendto+0x735/0xa10 net/socket.c:2191
 __do_sys_sendto net/socket.c:2203 [inline]
 __se_sys_sendto net/socket.c:2199 [inline]
 __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

CPU: 1 PID: 5049 Comm: syz-executor350 Not tainted 6.8.0-rc5-syzkaller-00297-gf2e367d6ad3b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
=====================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/02/25 08:44 upstream f2e367d6ad3b 8d446f15 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in geneve_udp_encap_recv
2024/01/25 21:11 upstream 9f8413c4a66f cc4a4020 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in geneve_udp_encap_recv
* Struck through repros no longer work on HEAD.