KMSAN: uninit-value in ip_rcv_core

From: syzbot
Date: Sun Sep 16 2018 - 07:03:10 EST

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Previous message: Jonathan Cameron: "Re: [PATCH v5] iio: proximity: Add driver support for ST's VL53L0X ToF ranging sensor."
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Hello,

syzbot found the following crash on:

HEAD commit: 42a037ca8d9d kmsan: update README.md to reference LLVM r34..
git tree: https://github.com/google/kmsan.git/master
console output: https://syzkaller.appspot.com/x/log.txt?x=1089adea400000
kernel config: https://syzkaller.appspot.com/x/.config?x=3431f03869413153
dashboard link: https://syzkaller.appspot.com/bug?extid=2e406a9ac75bb71d4b7a
compiler: clang version 8.0.0 (trunk 339414)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12d6d421400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13fdeb7a400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+2e406a9ac75bb71d4b7a@xxxxxxxxxxxxxxxxxxxxxxxxx

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 ip_rcv_core+0xabd/0x1160 net/ipv4/ip_input.c:464
CPU: 1 PID: 4270 Comm: syz-executor158 Not tainted 4.19.0-rc1+ #42
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+0x14b/0x190 lib/dump_stack.c:113
kmsan_report+0x183/0x2b0 mm/kmsan/kmsan.c:956
__msan_warning+0x70/0xc0 mm/kmsan/kmsan_instr.c:645
ip_rcv_core+0xabd/0x1160 net/ipv4/ip_input.c:464
ip_rcv+0xbb/0x6d0 net/ipv4/ip_input.c:521
__netif_receive_skb_one_core net/core/dev.c:4892 [inline]
__netif_receive_skb net/core/dev.c:5002 [inline]
process_backlog+0x752/0x10b0 net/core/dev.c:5808
napi_poll net/core/dev.c:6228 [inline]
net_rx_action+0x723/0x19d0 net/core/dev.c:6294
__do_softirq+0x562/0x948 kernel/softirq.c:292
do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1055
</IRQ>
do_softirq kernel/softirq.c:336 [inline]
__local_bh_enable_ip+0x119/0x150 kernel/softirq.c:189
local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32
rcu_read_unlock_bh include/linux/rcupdate.h:723 [inline]
__dev_queue_xmit+0x35a8/0x3ab0 net/core/dev.c:3830
dev_queue_xmit+0x4b/0x60 net/core/dev.c:3836
packet_snd net/packet/af_packet.c:2925 [inline]
packet_sendmsg+0x80ff/0x8c60 net/packet/af_packet.c:2950
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg net/socket.c:631 [inline]
___sys_sendmsg+0xe70/0x1290 net/socket.c:2114
__sys_sendmsg net/socket.c:2152 [inline]
__do_sys_sendmsg net/socket.c:2161 [inline]
__se_sys_sendmsg+0x2a3/0x3d0 net/socket.c:2159
__x64_sys_sendmsg+0x4a/0x70 net/socket.c:2159
do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x441149
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffebf721a18 EFLAGS: 00000286 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000441149
RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003
RBP: 00000000006cc018 R08: 0000000000000100 R09: 0000000000000100
R10: 0000000000000100 R11: 0000000000000286 R12: 00000000004020b0
R13: 0000000000402140 R14: 0000000000000000 R15: 0000000000000000

Uninit was stored to memory at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
kmsan_save_stack mm/kmsan/kmsan.c:271 [inline]
kmsan_internal_chain_origin+0x128/0x210 mm/kmsan/kmsan.c:573
__msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:482
iptunnel_xmit+0xa3c/0xd50 net/ipv4/ip_tunnel_core.c:85
ip_tunnel_xmit+0x33e1/0x3750 net/ipv4/ip_tunnel.c:778
__gre_xmit net/ipv4/ip_gre.c:449 [inline]
ipgre_xmit+0xdcf/0xeb0 net/ipv4/ip_gre.c:703
__netdev_start_xmit include/linux/netdevice.h:4287 [inline]
netdev_start_xmit include/linux/netdevice.h:4296 [inline]
xmit_one net/core/dev.c:3217 [inline]
dev_hard_start_xmit+0x5df/0xc20 net/core/dev.c:3233
__dev_queue_xmit+0x2f35/0x3ab0 net/core/dev.c:3803
dev_queue_xmit+0x4b/0x60 net/core/dev.c:3836
packet_snd net/packet/af_packet.c:2925 [inline]
packet_sendmsg+0x80ff/0x8c60 net/packet/af_packet.c:2950
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg net/socket.c:631 [inline]
___sys_sendmsg+0xe70/0x1290 net/socket.c:2114
__sys_sendmsg net/socket.c:2152 [inline]
__do_sys_sendmsg net/socket.c:2161 [inline]
__se_sys_sendmsg+0x2a3/0x3d0 net/socket.c:2159
__x64_sys_sendmsg+0x4a/0x70 net/socket.c:2159
do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was created at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:181
kmsan_kmalloc+0x98/0x100 mm/kmsan/kmsan_hooks.c:91
kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:100
slab_post_alloc_hook mm/slab.h:446 [inline]
slab_alloc_node mm/slub.c:2719 [inline]
__kmalloc_node_track_caller+0x9e7/0x1160 mm/slub.c:4352
__kmalloc_reserve net/core/skbuff.c:138 [inline]
__alloc_skb+0x2f5/0x9e0 net/core/skbuff.c:206
alloc_skb include/linux/skbuff.h:996 [inline]
alloc_skb_with_frags+0x1d0/0xac0 net/core/skbuff.c:5276
sock_alloc_send_pskb+0xb47/0x1170 net/core/sock.c:2082
packet_alloc_skb net/packet/af_packet.c:2779 [inline]
packet_snd net/packet/af_packet.c:2870 [inline]
packet_sendmsg+0x6599/0x8c60 net/packet/af_packet.c:2950
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg net/socket.c:631 [inline]
___sys_sendmsg+0xe70/0x1290 net/socket.c:2114
__sys_sendmsg net/socket.c:2152 [inline]
__do_sys_sendmsg net/socket.c:2161 [inline]
__se_sys_sendmsg+0x2a3/0x3d0 net/socket.c:2159
__x64_sys_sendmsg+0x4a/0x70 net/socket.c:2159
do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================

---
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Next message: Pavel Machek: "Re: [linuxwifi] [PATCH] fix iwlwifi on old cards in v4.19 was Re: 4.19-rc[23] iwlwifi: BUG in swiotlb"
Previous message: Jonathan Cameron: "Re: [PATCH v5] iio: proximity: Add driver support for ST's VL53L0X ToF ranging sensor."
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]