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SubjectKMSAN: uninit-value in inet_gro_receive (3)
From
Hello,

syzbot found the following crash on:

HEAD commit: 21c44613 kmsan: page_alloc: more assuring comment
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=1533f00c100000
kernel config: https://syzkaller.appspot.com/x/.config?x=a5915107b3106aaa
dashboard link: https://syzkaller.appspot.com/bug?extid=a83a64bf2be17a4479cf
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a83a64bf2be17a4479cf@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in pskb_may_pull include/linux/skbuff.h:2333 [inline]
BUG: KMSAN: uninit-value in skb_gro_header_slow include/linux/netdevice.h:2768 [inline]
BUG: KMSAN: uninit-value in inet_gro_receive+0x451/0x1a10 net/ipv4/af_inet.c:1423
CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.6.0-rc7-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:118
__msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
pskb_may_pull include/linux/skbuff.h:2333 [inline]
skb_gro_header_slow include/linux/netdevice.h:2768 [inline]
inet_gro_receive+0x451/0x1a10 net/ipv4/af_inet.c:1423
dev_gro_receive+0x2799/0x3260 net/core/dev.c:5774
napi_gro_receive+0x619/0xf90 net/core/dev.c:5908
gro_cell_poll+0x24c/0x400 net/core/gro_cells.c:60
napi_poll net/core/dev.c:6571 [inline]
net_rx_action+0x786/0x1aa0 net/core/dev.c:6639
__do_softirq+0x311/0x83d kernel/softirq.c:293
run_ksoftirqd+0x25/0x40 kernel/softirq.c:607
smpboot_thread_fn+0x493/0x980 kernel/smpboot.c:165
kthread+0x4b5/0x4f0 kernel/kthread.c:256
ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353

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
__skb_pull include/linux/skbuff.h:2305 [inline]
skb_pull_inline include/linux/skbuff.h:2312 [inline]
eth_type_trans+0x684/0xa90 net/ethernet/eth.c:165
ip_tunnel_rcv+0xe8b/0x1ae0 net/ipv4/ip_tunnel.c:416
erspan_rcv net/ipv4/ip_gre.c:321 [inline]
gre_rcv+0x155e/0x1940 net/ipv4/ip_gre.c:419
gre_rcv+0x2dd/0x3c0 net/ipv4/gre_demux.c:163
ip_protocol_deliver_rcu+0x700/0xbc0 net/ipv4/ip_input.c:204
ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
NF_HOOK include/linux/netfilter.h:307 [inline]
ip_local_deliver+0x62a/0x7c0 net/ipv4/ip_input.c:252
dst_input include/net/dst.h:442 [inline]
ip_rcv_finish net/ipv4/ip_input.c:428 [inline]
NF_HOOK include/linux/netfilter.h:307 [inline]
ip_rcv+0x6cf/0x750 net/ipv4/ip_input.c:538
__netif_receive_skb_one_core net/core/dev.c:5187 [inline]
__netif_receive_skb net/core/dev.c:5301 [inline]
process_backlog+0xf0b/0x1410 net/core/dev.c:6133
napi_poll net/core/dev.c:6571 [inline]
net_rx_action+0x786/0x1aa0 net/core/dev.c:6639
__do_softirq+0x311/0x83d kernel/softirq.c:293

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
__skb_pull include/linux/skbuff.h:2305 [inline]
skb_pull_rcsum+0x2ca/0x4f0 net/core/skbuff.c:3621
__iptunnel_pull_header+0x14b/0xbd0 net/ipv4/ip_tunnel_core.c:97
erspan_rcv net/ipv4/ip_gre.c:279 [inline]
gre_rcv+0x6d8/0x1940 net/ipv4/ip_gre.c:419
gre_rcv+0x2dd/0x3c0 net/ipv4/gre_demux.c:163
ip_protocol_deliver_rcu+0x700/0xbc0 net/ipv4/ip_input.c:204
ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
NF_HOOK include/linux/netfilter.h:307 [inline]
ip_local_deliver+0x62a/0x7c0 net/ipv4/ip_input.c:252
dst_input include/net/dst.h:442 [inline]
ip_rcv_finish net/ipv4/ip_input.c:428 [inline]
NF_HOOK include/linux/netfilter.h:307 [inline]
ip_rcv+0x6cf/0x750 net/ipv4/ip_input.c:538
__netif_receive_skb_one_core net/core/dev.c:5187 [inline]
__netif_receive_skb net/core/dev.c:5301 [inline]
process_backlog+0xf0b/0x1410 net/core/dev.c:6133
napi_poll net/core/dev.c:6571 [inline]
net_rx_action+0x786/0x1aa0 net/core/dev.c:6639
__do_softirq+0x311/0x83d kernel/softirq.c:293

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
pskb_expand_head+0x38b/0x1b00 net/core/skbuff.c:1636
__skb_cow include/linux/skbuff.h:3169 [inline]
skb_cow_head include/linux/skbuff.h:3203 [inline]
ip_tunnel_xmit+0x2a10/0x34f0 net/ipv4/ip_tunnel.c:811
__gre_xmit net/ipv4/ip_gre.c:448 [inline]
erspan_xmit+0x1779/0x2ae0 net/ipv4/ip_gre.c:683
__netdev_start_xmit include/linux/netdevice.h:4523 [inline]
netdev_start_xmit include/linux/netdevice.h:4537 [inline]
xmit_one net/core/dev.c:3477 [inline]
dev_hard_start_xmit+0x531/0xab0 net/core/dev.c:3493
sch_direct_xmit+0x512/0x18b0 net/sched/sch_generic.c:314
qdisc_restart net/sched/sch_generic.c:377 [inline]
__qdisc_run+0x15ec/0x3350 net/sched/sch_generic.c:385
qdisc_run include/net/pkt_sched.h:126 [inline]
__dev_xmit_skb net/core/dev.c:3668 [inline]
__dev_queue_xmit+0x23b7/0x3b20 net/core/dev.c:4021
dev_queue_xmit+0x4b/0x60 net/core/dev.c:4085
neigh_resolve_output+0xab0/0xb40 net/core/neighbour.c:1487
neigh_output include/net/neighbour.h:510 [inline]
ip_finish_output2+0x1acc/0x2610 net/ipv4/ip_output.c:228
__ip_finish_output+0xaa7/0xd80 net/ipv4/ip_output.c:306
ip_finish_output+0x166/0x410 net/ipv4/ip_output.c:316
NF_HOOK_COND include/linux/netfilter.h:296 [inline]
ip_mc_output+0xfbf/0x1090 net/ipv4/ip_output.c:415
dst_output include/net/dst.h:436 [inline]
ip_local_out net/ipv4/ip_output.c:125 [inline]
ip_send_skb+0x179/0x360 net/ipv4/ip_output.c:1560
udp_send_skb+0x1046/0x18b0 net/ipv4/udp.c:891
udp_sendmsg+0x3bb5/0x4100 net/ipv4/udp.c:1178
inet_sendmsg+0x276/0x2e0 net/ipv4/af_inet.c:807
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg net/socket.c:672 [inline]
____sys_sendmsg+0x1056/0x1350 net/socket.c:2345
___sys_sendmsg net/socket.c:2399 [inline]
__sys_sendmmsg+0x5b6/0xc90 net/socket.c:2489
__do_sys_sendmmsg net/socket.c:2518 [inline]
__se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2515
__x64_sys_sendmmsg+0x56/0x70 net/socket.c:2515
do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296
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:2801 [inline]
__kmalloc_node_track_caller+0xb40/0x1200 mm/slub.c:4420
__kmalloc_reserve net/core/skbuff.c:142 [inline]
__alloc_skb+0x2fd/0xac0 net/core/skbuff.c:210
alloc_skb include/linux/skbuff.h:1081 [inline]
alloc_skb_with_frags+0x18c/0xa70 net/core/skbuff.c:5764
sock_alloc_send_pskb+0xada/0xc60 net/core/sock.c:2245
sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2262
__ip_append_data+0x3b41/0x5660 net/ipv4/ip_output.c:1089
ip_make_skb+0x394/0x880 net/ipv4/ip_output.c:1626
udp_sendmsg+0x36dc/0x4100 net/ipv4/udp.c:1173
inet_sendmsg+0x276/0x2e0 net/ipv4/af_inet.c:807
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg net/socket.c:672 [inline]
____sys_sendmsg+0x1056/0x1350 net/socket.c:2345
___sys_sendmsg net/socket.c:2399 [inline]
__sys_sendmmsg+0x5b6/0xc90 net/socket.c:2489
__do_sys_sendmmsg net/socket.c:2518 [inline]
__se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2515
__x64_sys_sendmmsg+0x56/0x70 net/socket.c:2515
do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
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