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KMSAN: uninit-value in ip6_parse_tlv

Status: upstream: reported C repro on 2018/09/20 20:54
Subsystems: net (incorrect?)
Reported-by: syzbot+f08ac29f2ac8aea19826@syzkaller.appspotmail.com
First crash: 1811d, last: 627d
Last patch testing requests:
Created Duration User Patch Repo Result
2022/12/29 07:31 15m retest repro https://github.com/google/kmsan.git master error
2022/09/20 05:29 13m retest repro https://github.com/google/kmsan.git master error
2022/09/20 03:29 21m retest repro https://github.com/google/kmsan.git master OK log
2022/09/20 01:29 19m retest repro https://github.com/google/kmsan.git master OK log
2021/07/25 13:43 11m anant.thazhemadam@gmail.com https://github.com/google/kmsan.git master report log

Sample crash report:
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KMSAN: uninit-value in ip6_parse_tlv+0x8d5/0xcd0 net/ipv6/exthdrs.c:172
CPU: 1 PID: 4535 Comm: syz-executor786 Not tainted 4.17.0-rc3+ #88
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
 ip6_parse_tlv+0x8d5/0xcd0 net/ipv6/exthdrs.c:172
 ipv6_destopt_rcv+0x50d/0xd90 net/ipv6/exthdrs.c:310
 ip6_input_finish+0xaac/0x2250 net/ipv6/ip6_input.c:284
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip6_input net/ipv6/ip6_input.c:327 [inline]
 ip6_mc_input+0xa67/0x1080 net/ipv6/ip6_input.c:404
 dst_input include/net/dst.h:450 [inline]
 ip6_rcv_finish+0x46e/0x6e0 net/ipv6/ip6_input.c:71
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ipv6_rcv+0x1e16/0x2340 net/ipv6/ip6_input.c:208
 __netif_receive_skb_core+0x47df/0x4a90 net/core/dev.c:4592
 __netif_receive_skb net/core/dev.c:4657 [inline]
 process_backlog+0x62d/0xe20 net/core/dev.c:5337
 napi_poll net/core/dev.c:5735 [inline]
 net_rx_action+0x7c1/0x1a70 net/core/dev.c:5801
 __do_softirq+0x56d/0x93d kernel/softirq.c:285
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1046
 </IRQ>
 do_softirq+0xb6/0xf0 kernel/softirq.c:329
 netif_rx_ni net/core/dev.c:4219 [inline]
 dev_loopback_xmit+0x8b0/0x900 net/core/dev.c:3347
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip6_finish_output2+0x1e24/0x2110 net/ipv6/ip6_output.c:84
 ip6_finish_output+0xae9/0xba0 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip6_output+0x597/0x6c0 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:444 [inline]
 ip6_local_out+0x15e/0x1d0 net/ipv6/output_core.c:176
 ip6_send_skb net/ipv6/ip6_output.c:1702 [inline]
 ip6_push_pending_frames+0x218/0x4d0 net/ipv6/ip6_output.c:1722
 rawv6_push_pending_frames net/ipv6/raw.c:616 [inline]
 rawv6_sendmsg+0x4235/0x4fb0 net/ipv6/raw.c:935
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg net/socket.c:639 [inline]
 __sys_sendto+0x6c0/0x7e0 net/socket.c:1789
 __do_sys_sendto net/socket.c:1801 [inline]
 __se_sys_sendto net/socket.c:1797 [inline]
 __x64_sys_sendto+0x1a1/0x210 net/socket.c:1797
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x43fe79
RSP: 002b:00007ffc475970d8 EFLAGS: 00000216 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe79
RDX: 0000000000000000 RSI: 0000000020001ffe RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000020003000 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004017a0
R13: 0000000000401830 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan.c:321
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2753 [inline]
 __kmalloc_node_track_caller+0xb32/0x11b0 mm/slub.c:4395
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2cf/0x9f0 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:988 [inline]
 alloc_skb_with_frags+0x1e6/0xb80 net/core/skbuff.c:5254
 sock_alloc_send_pskb+0xb56/0x1190 net/core/sock.c:2088
 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2105
 __ip6_append_data+0x33a2/0x4e40 net/ipv6/ip6_output.c:1427
 ip6_append_data+0x40e/0x6b0 net/ipv6/ip6_output.c:1596
 rawv6_sendmsg+0x2740/0x4fb0 net/ipv6/raw.c:928
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg net/socket.c:639 [inline]
 __sys_sendto+0x6c0/0x7e0 net/socket.c:1789
 __do_sys_sendto net/socket.c:1801 [inline]
 __se_sys_sendto net/socket.c:1797 [inline]
 __x64_sys_sendto+0x1a1/0x210 net/socket.c:1797
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
==================================================================

Crashes (450):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-kmsan-gce 2018/05/10 06:35 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report syz C
ci-upstream-kmsan-gce 2019/04/23 01:38 https://github.com/google/kmsan.git master 199a02db1f61 53199d6e .config console log report syz C
ci-upstream-kmsan-gce 2019/02/06 04:05 https://github.com/google/kmsan.git master fa1981bee40f d672172c .config console log report syz C
ci-upstream-kmsan-gce 2021/07/11 07:36 https://github.com/google/kmsan.git master 57b5797c8013 8f5a7b8c .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/07/09 13:05 https://github.com/google/kmsan.git master 57b5797c8013 281e815f .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/07/03 03:02 https://github.com/google/kmsan.git master 57b5797c8013 55aa55c2 .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/06/19 06:55 https://github.com/google/kmsan.git master bfeba8b4c158 aba2b2fb .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/06/13 03:14 https://github.com/google/kmsan.git master 6099c9da2f7d 1ba81399 .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/06/06 17:55 https://github.com/google/kmsan.git master 6099c9da2f7d 500c2339 .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/06/06 00:48 https://github.com/google/kmsan.git master 6099c9da2f7d 500c2339 .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/05/16 18:54 https://github.com/google/kmsan.git master bdefec9ab855 f54a5c09 .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/05/13 18:05 https://github.com/google/kmsan.git master bdefec9ab855 ed7d41c5 .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/05/12 00:37 https://github.com/google/kmsan.git master bdefec9ab855 b3c3bb8e .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/05/06 08:00 https://github.com/google/kmsan.git master 4ebaab5fb428 06c27ff5 .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/04/24 04:56 https://github.com/google/kmsan.git master 4ebaab5fb428 17f0b706 .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/04/16 06:21 https://github.com/google/kmsan.git master 4ebaab5fb428 c59079a6 .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/04/10 22:16 https://github.com/google/kmsan.git master 4ebaab5fb428 bfeda1b1 .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/04/02 20:17 https://github.com/google/kmsan.git master 29ad81a1074a 6a81331a .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce-386 2021/05/30 03:25 https://github.com/google/kmsan.git master 6099c9da2f7d 325a8dab .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce-386 2021/03/27 13:36 https://github.com/google/kmsan.git master 29ad81a1074a a8529b82 .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce-386 2021/03/23 03:46 https://github.com/google/kmsan.git master 29ad81a1074a 8092f30d .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce-386 2021/02/08 07:27 https://github.com/google/kmsan.git master 73d62e81b476 2ce644fc .config console log report info KMSAN: uninit-value in ip6_parse_tlv
ci-upstream-kmsan-gce 2021/01/03 23:36 https://github.com/google/kmsan.git master 73d62e81b476 79264ae3 .config console log report info
ci-upstream-kmsan-gce 2020/10/07 08:43 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info
ci-upstream-kmsan-gce 2020/10/07 05:48 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info
ci-upstream-kmsan-gce 2020/10/06 09:09 https://github.com/google/kmsan.git master 5edb1df295b9 1880b4a9 .config console log report info
ci-upstream-kmsan-gce 2020/10/01 08:23 https://github.com/google/kmsan.git master 5edb1df295b9 a9767fb2 .config console log report info
ci-upstream-kmsan-gce 2020/08/24 17:11 https://github.com/google/kmsan.git master ce8056d1f79e 67b599d1 .config console log report
ci-upstream-kmsan-gce 2020/08/23 06:00 https://github.com/google/kmsan.git master ce8056d1f79e 1da71ab0 .config console log report
ci-upstream-kmsan-gce 2020/08/22 15:07 https://github.com/google/kmsan.git master ce8056d1f79e 6436ce4b .config console log report
ci-upstream-kmsan-gce 2020/08/17 18:35 https://github.com/google/kmsan.git master ce8056d1f79e 424dd8e7 .config console log report
ci-upstream-kmsan-gce 2020/08/15 19:20 https://github.com/google/kmsan.git master ce8056d1f79e 424dd8e7 .config console log report
ci-upstream-kmsan-gce 2020/07/26 08:14 https://github.com/google/kmsan.git master 93f54a72361a 1f7cc1ca .config console log report
ci-upstream-kmsan-gce 2020/07/26 03:42 https://github.com/google/kmsan.git master 93f54a72361a 1f7cc1ca .config console log report
ci-upstream-kmsan-gce 2020/07/23 15:27 https://github.com/google/kmsan.git master 93f54a72361a 340ea530 .config console log report
ci-upstream-kmsan-gce 2020/07/14 23:29 https://github.com/google/kmsan.git master f0d5ec902b23 609fb517 .config console log report
ci-upstream-kmsan-gce 2020/07/14 01:13 https://github.com/google/kmsan.git master f0d5ec902b23 f90ec899 .config console log report
ci-upstream-kmsan-gce 2020/07/13 05:02 https://github.com/google/kmsan.git master f0d5ec902b23 9ebcc5b1 .config console log report
ci-upstream-kmsan-gce 2020/07/12 17:41 https://github.com/google/kmsan.git master f0d5ec902b23 115e1930 .config console log report
ci-upstream-kmsan-gce 2020/07/09 05:31 https://github.com/google/kmsan.git master f0d5ec902b23 bc238812 .config console log report
ci-upstream-kmsan-gce 2020/07/08 17:52 https://github.com/google/kmsan.git master f0d5ec902b23 51095195 .config console log report
ci-upstream-kmsan-gce 2020/07/08 03:04 https://github.com/google/kmsan.git master f0d5ec902b23 51095195 .config console log report
ci-upstream-kmsan-gce 2020/07/04 14:02 https://github.com/google/kmsan.git master f0d5ec902b23 51095195 .config console log report
ci-upstream-kmsan-gce 2020/07/03 07:16 https://github.com/google/kmsan.git master f0d5ec902b23 bed10395 .config console log report
ci-upstream-kmsan-gce 2020/06/29 09:09 https://github.com/google/kmsan.git master f0d5ec902b23 a2cdad9d .config console log report
ci-upstream-kmsan-gce 2020/06/27 23:56 https://github.com/google/kmsan.git master f0d5ec902b23 ffec44b5 .config console log report
ci-upstream-kmsan-gce 2020/06/25 14:52 https://github.com/google/kmsan.git master f0d5ec902b23 54566aff .config console log report
ci-upstream-kmsan-gce 2018/04/14 11:38 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report
ci-upstream-kmsan-gce-386 2020/12/22 18:44 https://github.com/google/kmsan.git master 73d62e81b476 04201c06 .config console log report info
ci-upstream-kmsan-gce-386 2020/12/12 15:27 https://github.com/google/kmsan.git master 73d62e81b476 bca53db9 .config console log report info
ci-upstream-kmsan-gce-386 2020/11/01 01:39 https://github.com/google/kmsan.git master e16174226146 8bc4594f .config console log report info
ci-upstream-kmsan-gce-386 2020/10/01 10:57 https://github.com/google/kmsan.git master 5edb1df295b9 a9767fb2 .config console log report info
ci-upstream-kmsan-gce-386 2020/09/04 03:20 https://github.com/google/kmsan.git master 3b3ea6028136 abf9ba4f .config console log report
ci-upstream-kmsan-gce-386 2020/09/01 16:39 https://github.com/google/kmsan.git master 3b3ea6028136 d5a3ae1f .config console log report
ci-upstream-kmsan-gce-386 2020/08/05 01:20 https://github.com/google/kmsan.git master 93f54a72361a 80a06902 .config console log report
ci-upstream-kmsan-gce-386 2020/07/28 01:52 https://github.com/google/kmsan.git master 93f54a72361a cb93dc6a .config console log report
* Struck through repros no longer work on HEAD.