From: syzbot <syzbot+2974b85346f85b586f4d@syzkaller.appspotmail.com>
To: davem@davemloft.net, herbert@gondor.apana.org.au,
kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, steffen.klassert@secunet.com,
syzkaller-bugs@googlegroups.com, yoshfuji@linux-ipv6.org
Subject: Re: KMSAN: uninit-value in _decode_session6
Date: Tue, 01 May 2018 02:12:02 -0700 [thread overview]
Message-ID: <00000000000007fb72056b215d2b@google.com> (raw)
In-Reply-To: <000000000000311cdd0569510cc7@google.com>
syzbot has found a reproducer for the following crash on:
HEAD commit: d2d741e5d189 kmsan: add initialization for shmem pages
git tree: https://github.com/google/kmsan.git/master
console output: https://syzkaller.appspot.com/x/log.txt?id=6550343064223744
kernel config:
https://syzkaller.appspot.com/x/.config?id=328654897048964367
dashboard link: https://syzkaller.appspot.com/bug?extid=2974b85346f85b586f4d
compiler: clang version 7.0.0 (trunk 329391)
syzkaller
repro:https://syzkaller.appspot.com/x/repro.syz?id=5023772637659136
C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5102535626981376
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+2974b85346f85b586f4d@syzkaller.appspotmail.com
IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
8021q: adding VLAN 0 to HW filter on device team0
==================================================================
BUG: KMSAN: uninit-value in _decode_session6+0x6d2/0x16e0
net/ipv6/xfrm6_policy.c:151
CPU: 0 PID: 4529 Comm: syz-executor165 Not tainted 4.16.0+ #87
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x185/0x1d0 lib/dump_stack.c:53
kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
__msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
_decode_session6+0x6d2/0x16e0 net/ipv6/xfrm6_policy.c:151
__xfrm_decode_session+0x151/0x200 net/xfrm/xfrm_policy.c:2368
xfrm_decode_session_reverse include/net/xfrm.h:1213 [inline]
icmpv6_route_lookup net/ipv6/icmp.c:372 [inline]
icmp6_send+0x2bf7/0x3730 net/ipv6/icmp.c:551
icmpv6_send+0xe0/0x110 net/ipv6/ip6_icmp.c:43
ip6_link_failure+0x8f/0x580 net/ipv6/route.c:2034
dst_link_failure include/net/dst.h:426 [inline]
ip6_tnl_xmit+0x1423/0x3af0 net/ipv6/ip6_tunnel.c:1215
ip6ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1367 [inline]
ip6_tnl_start_xmit+0x1cc0/0x1ef0 net/ipv6/ip6_tunnel.c:1390
__netdev_start_xmit include/linux/netdevice.h:4066 [inline]
netdev_start_xmit include/linux/netdevice.h:4075 [inline]
xmit_one net/core/dev.c:3026 [inline]
dev_hard_start_xmit+0x5f1/0xc70 net/core/dev.c:3042
__dev_queue_xmit+0x27ee/0x3520 net/core/dev.c:3557
dev_queue_xmit+0x4b/0x60 net/core/dev.c:3590
neigh_direct_output+0x42/0x50 net/core/neighbour.c:1390
neigh_output include/net/neighbour.h:482 [inline]
ip6_finish_output2+0x1d01/0x2130 net/ipv6/ip6_output.c:120
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:443 [inline]
ip6_local_out+0x15e/0x1d0 net/ipv6/output_core.c:176
ip6_send_skb net/ipv6/ip6_output.c:1682 [inline]
ip6_push_pending_frames+0x218/0x4d0 net/ipv6/ip6_output.c:1702
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:764
sock_sendmsg_nosec net/socket.c:630 [inline]
sock_sendmsg net/socket.c:640 [inline]
sock_write_iter+0x3b9/0x470 net/socket.c:909
call_write_iter include/linux/fs.h:1782 [inline]
new_sync_write fs/read_write.c:469 [inline]
__vfs_write+0x7fb/0x9f0 fs/read_write.c:482
vfs_write+0x463/0x8d0 fs/read_write.c:544
SYSC_write+0x172/0x360 fs/read_write.c:589
SyS_write+0x55/0x80 fs/read_write.c:581
do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x4418b9
RSP: 002b:00007ffece331e68 EFLAGS: 00000217 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004418b9
RDX: 000000000000036b RSI: 0000000020000240 RDI: 0000000000000004
RBP: 00000000006cd018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004025b0
R13: 0000000000402640 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+0x11/0x20 mm/kmsan/kmsan.c:321
slab_post_alloc_hook mm/slab.h:445 [inline]
slab_alloc_node mm/slub.c:2737 [inline]
__kmalloc_node_track_caller+0xaed/0x11c0 mm/slub.c:4369
__kmalloc_reserve net/core/skbuff.c:138 [inline]
pskb_expand_head+0x21d/0x1a70 net/core/skbuff.c:1458
__pskb_pull_tail+0x1d7/0x2300 net/core/skbuff.c:1878
pskb_may_pull include/linux/skbuff.h:2112 [inline]
ip6_tnl_parse_tlv_enc_lim+0x7f5/0xa90 net/ipv6/ip6_tunnel.c:411
ip6ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1326 [inline]
ip6_tnl_start_xmit+0x911/0x1ef0 net/ipv6/ip6_tunnel.c:1390
__netdev_start_xmit include/linux/netdevice.h:4066 [inline]
netdev_start_xmit include/linux/netdevice.h:4075 [inline]
xmit_one net/core/dev.c:3026 [inline]
dev_hard_start_xmit+0x5f1/0xc70 net/core/dev.c:3042
__dev_queue_xmit+0x27ee/0x3520 net/core/dev.c:3557
dev_queue_xmit+0x4b/0x60 net/core/dev.c:3590
neigh_direct_output+0x42/0x50 net/core/neighbour.c:1390
neigh_output include/net/neighbour.h:482 [inline]
ip6_finish_output2+0x1d01/0x2130 net/ipv6/ip6_output.c:120
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:443 [inline]
ip6_local_out+0x15e/0x1d0 net/ipv6/output_core.c:176
ip6_send_skb net/ipv6/ip6_output.c:1682 [inline]
ip6_push_pending_frames+0x218/0x4d0 net/ipv6/ip6_output.c:1702
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:764
sock_sendmsg_nosec net/socket.c:630 [inline]
sock_sendmsg net/socket.c:640 [inline]
sock_write_iter+0x3b9/0x470 net/socket.c:909
call_write_iter include/linux/fs.h:1782 [inline]
new_sync_write fs/read_write.c:469 [inline]
__vfs_write+0x7fb/0x9f0 fs/read_write.c:482
vfs_write+0x463/0x8d0 fs/read_write.c:544
SYSC_write+0x172/0x360 fs/read_write.c:589
SyS_write+0x55/0x80 fs/read_write.c:581
do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
==================================================================
prev parent reply other threads:[~2018-05-01 9:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-08 7:15 KMSAN: uninit-value in _decode_session6 syzbot
2018-05-01 9:12 ` syzbot [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=00000000000007fb72056b215d2b@google.com \
--to=syzbot+2974b85346f85b586f4d@syzkaller.appspotmail.com \
--cc=davem@davemloft.net \
--cc=herbert@gondor.apana.org.au \
--cc=kuznet@ms2.inr.ac.ru \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=steffen.klassert@secunet.com \
--cc=syzkaller-bugs@googlegroups.com \
--cc=yoshfuji@linux-ipv6.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.