KMSAN: uninit-value in hash_ip6_add

Status: auto-closed as invalid on 2020/10/20 06:53
Subsystems: netfilter
[Documentation on labels]
Reported-by: syzbot+89bacaf2be1277d1e6de@syzkaller.appspotmail.com
First crash: 2249d, last: 2245d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
KMSAN: uninit-value in hash_ip6_add 0 (1) 2020/06/18 17:36
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in hash_ip6_add (2) netfilter 7 2 2095d 2095d 0/29 auto-closed as invalid on 2021/02/17 03:50

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in __read_once_size include/linux/compiler.h:206 [inline]
BUG: KMSAN: uninit-value in hash_ip6_add+0x14eb/0x30c0 net/netfilter/ipset/ip_set_hash_gen.h:892
CPU: 0 PID: 1427 Comm: syz-executor.5 Not tainted 5.7.0-rc4-syzkaller #0
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+0x1c9/0x220 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 __read_once_size include/linux/compiler.h:206 [inline]
 hash_ip6_add+0x14eb/0x30c0 net/netfilter/ipset/ip_set_hash_gen.h:892
 hash_ip6_uadt+0x8e6/0xad0 net/netfilter/ipset/ip_set_hash_ip.c:267
 call_ad+0x2dc/0xbc0 net/netfilter/ipset/ip_set_core.c:1732
 ip_set_ad+0xad2/0x1110 net/netfilter/ipset/ip_set_core.c:1820
 ip_set_uadd+0xf6/0x110 net/netfilter/ipset/ip_set_core.c:1845
 nfnetlink_rcv_msg+0xb86/0xcf0 net/netfilter/nfnetlink.c:229
 netlink_rcv_skb+0x451/0x650 net/netlink/af_netlink.c:2469
 nfnetlink_rcv+0x3b5/0x3ab0 net/netfilter/nfnetlink.c:563
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2362
 ___sys_sendmsg net/socket.c:2416 [inline]
 __sys_sendmsg+0x623/0x750 net/socket.c:2449
 __do_sys_sendmsg net/socket.c:2458 [inline]
 __se_sys_sendmsg+0x97/0xb0 net/socket.c:2456
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2456
 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ca59
Code: 0d 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fcc709dec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004fe3e0 RCX: 000000000045ca59
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000003
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000946 R14: 00000000004cc0e0 R15: 00007fcc709df6d4

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165
 ip6_netmask include/linux/netfilter/ipset/pfxlen.h:49 [inline]
 hash_ip6_netmask net/netfilter/ipset/ip_set_hash_ip.c:185 [inline]
 hash_ip6_uadt+0x9df/0xad0 net/netfilter/ipset/ip_set_hash_ip.c:263
 call_ad+0x2dc/0xbc0 net/netfilter/ipset/ip_set_core.c:1732
 ip_set_ad+0xad2/0x1110 net/netfilter/ipset/ip_set_core.c:1820
 ip_set_uadd+0xf6/0x110 net/netfilter/ipset/ip_set_core.c:1845
 nfnetlink_rcv_msg+0xb86/0xcf0 net/netfilter/nfnetlink.c:229
 netlink_rcv_skb+0x451/0x650 net/netlink/af_netlink.c:2469
 nfnetlink_rcv+0x3b5/0x3ab0 net/netfilter/nfnetlink.c:563
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2362
 ___sys_sendmsg net/socket.c:2416 [inline]
 __sys_sendmsg+0x623/0x750 net/socket.c:2449
 __do_sys_sendmsg net/socket.c:2458 [inline]
 __se_sys_sendmsg+0x97/0xb0 net/socket.c:2456
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2456
 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116
 ip_set_get_ipaddr6+0x26a/0x300 net/netfilter/ipset/ip_set_core.c:325
 hash_ip6_uadt+0x450/0xad0 net/netfilter/ipset/ip_set_hash_ip.c:255
 call_ad+0x2dc/0xbc0 net/netfilter/ipset/ip_set_core.c:1732
 ip_set_ad+0xad2/0x1110 net/netfilter/ipset/ip_set_core.c:1820
 ip_set_uadd+0xf6/0x110 net/netfilter/ipset/ip_set_core.c:1845
 nfnetlink_rcv_msg+0xb86/0xcf0 net/netfilter/nfnetlink.c:229
 netlink_rcv_skb+0x451/0x650 net/netlink/af_netlink.c:2469
 nfnetlink_rcv+0x3b5/0x3ab0 net/netfilter/nfnetlink.c:563
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2362
 ___sys_sendmsg net/socket.c:2416 [inline]
 __sys_sendmsg+0x623/0x750 net/socket.c:2449
 __do_sys_sendmsg net/socket.c:2458 [inline]
 __se_sys_sendmsg+0x97/0xb0 net/socket.c:2456
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2456
 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127
 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80
 slab_alloc_node mm/slub.c:2802 [inline]
 __kmalloc_node_track_caller+0xb40/0x1200 mm/slub.c:4436
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2fd/0xac0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1083 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1175 [inline]
 netlink_sendmsg+0x7d3/0x14d0 net/netlink/af_netlink.c:1893
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2362
 ___sys_sendmsg net/socket.c:2416 [inline]
 __sys_sendmsg+0x623/0x750 net/socket.c:2449
 __do_sys_sendmsg net/socket.c:2458 [inline]
 __se_sys_sendmsg+0x97/0xb0 net/socket.c:2456
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2456
 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/06/18 19:40 https://github.com/google/kmsan.git master f0d5ec902b23 d45a4d69 .config console log report ci-upstream-kmsan-gce
2020/06/17 23:16 https://github.com/google/kmsan.git master f0d5ec902b23 b9f3810b .config console log report ci-upstream-kmsan-gce
2020/06/22 06:52 https://github.com/google/kmsan.git master f0d5ec902b23 eabcced4 .config console log report ci-upstream-kmsan-gce-386
* Struck through repros no longer work on HEAD.