syzbot


KASAN: use-after-free Read in __netif_receive_skb_core

Status: upstream: reported syz repro on 2020/05/16 19:24
Reported-by: syzbot+48686a94cbaf2d9dd5fb@syzkaller.appspotmail.com
First crash: 935d, last: 518d

Fix bisection: failed (bisect log)
similar bugs (3):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: use-after-free Read in __netif_receive_skb_core C 239 1900d 1862d 0/24 closed as invalid on 2017/11/01 19:36
linux-4.19 KASAN: use-after-free Read in __netif_receive_skb_core syz error 20 250d 791d 0/1 upstream: reported syz repro on 2020/10/08 04:31
upstream KMSAN: uninit-value in __netif_receive_skb_core C 343 172d 1701d 0/24 upstream: reported C repro on 2018/04/12 08:01
Patch testing requests:
Created Duration User Patch Repo Result
2022/09/18 02:29 10m retest repro linux-4.14.y report log
2022/09/18 01:29 10m retest repro linux-4.14.y report log
2022/09/18 00:29 10m retest repro linux-4.14.y report log

Sample crash report:
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
==================================================================
BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:183 [inline]
BUG: KASAN: use-after-free in deliver_ptype_list_skb net/core/dev.c:1888 [inline]
BUG: KASAN: use-after-free in __netif_receive_skb_core+0x23e1/0x2a30 net/core/dev.c:4462
Read of size 8 at addr ffff8880957eca68 by task syz-executor.3/11058

CPU: 1 PID: 11058 Comm: syz-executor.3 Not tainted 4.14.227-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 __read_once_size include/linux/compiler.h:183 [inline]
 deliver_ptype_list_skb net/core/dev.c:1888 [inline]
 __netif_receive_skb_core+0x23e1/0x2a30 net/core/dev.c:4462
 __netif_receive_skb+0x27/0x1a0 net/core/dev.c:4512
 process_backlog+0x218/0x6f0 net/core/dev.c:5194
 napi_poll net/core/dev.c:5596 [inline]
 net_rx_action+0x466/0xfd0 net/core/dev.c:5662
 __do_softirq+0x24d/0x9ff kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x193/0x240 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:638 [inline]
 smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
 </IRQ>
RIP: 0010:__rcu_read_unlock+0xe7/0x160 kernel/rcu/update.c:262
RSP: 0018:ffff88808895f670 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
RAX: 0000000080000000 RBX: ffff8880b1ae2080 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffff8880b1ae2930 RDI: 0000000000000001
RBP: ffff8880b1ae2400 R08: ffff8880b1ae2410 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880b608458c R14: ffff88809c7d3c84 R15: 0000000000000001
 rcu_read_unlock include/linux/rcupdate.h:684 [inline]
 ip_queue_xmit+0x7e9/0x1a80 net/ipv4/ip_output.c:506
 __tcp_transmit_skb+0x17e2/0x2cb0 net/ipv4/tcp_output.c:1133
 __tcp_send_ack.part.0+0x399/0x580 net/ipv4/tcp_output.c:3648
 __tcp_send_ack net/ipv4/tcp_output.c:3654 [inline]
 tcp_send_ack+0x6f/0x90 net/ipv4/tcp_output.c:3654
 __tcp_ack_snd_check+0xf6/0x380 net/ipv4/tcp_input.c:5156
 tcp_ack_snd_check net/ipv4/tcp_input.c:5169 [inline]
 tcp_rcv_established+0x76c/0x1810 net/ipv4/tcp_input.c:5584
 tcp_v4_do_rcv+0x541/0x7d0 net/ipv4/tcp_ipv4.c:1476
 sk_backlog_rcv include/net/sock.h:921 [inline]
 __release_sock+0x12a/0x350 net/core/sock.c:2269
 release_sock+0x54/0x1b0 net/core/sock.c:2805
 sk_stream_wait_memory+0x492/0xd20 net/core/stream.c:145
 tcp_sendmsg_locked+0x1179/0x2ef0 net/ipv4/tcp.c:1416
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457
 inet_sendmsg+0x11a/0x4e0 net/ipv4/af_inet.c:762
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 SYSC_sendto net/socket.c:1763 [inline]
 SyS_sendto+0x1c7/0x2c0 net/socket.c:1731
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x466459
RSP: 002b:00007f4afa6ee188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459
RDX: 000000000000fe6a RSI: 00000000200012c0 RDI: 0000000000000004
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000027
R10: 000000000020c49a R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffe6aedaeaf R14: 00007f4afa6ee300 R15: 0000000000022000

Allocated by task 11050:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15a/0x400 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 sk_prot_alloc+0x1ba/0x290 net/core/sock.c:1467
 sk_alloc+0x36/0xcd0 net/core/sock.c:1521
 packet_create+0xf5/0x7f0 net/packet/af_packet.c:3295
 __sock_create+0x303/0x620 net/socket.c:1275
 sock_create net/socket.c:1315 [inline]
 SYSC_socket net/socket.c:1345 [inline]
 SyS_socket+0xd1/0x1b0 net/socket.c:1325
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 11044:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 sk_prot_free net/core/sock.c:1504 [inline]
 __sk_destruct+0x5e3/0x760 net/core/sock.c:1582
 sk_destruct net/core/sock.c:1597 [inline]
 __sk_free+0xd9/0x2d0 net/core/sock.c:1605
 sk_free+0x2b/0x40 net/core/sock.c:1616
 sock_put include/net/sock.h:1662 [inline]
 packet_release+0x837/0xa80 net/packet/af_packet.c:3124
 __sock_release+0xcd/0x2b0 net/socket.c:602
 sock_close+0x15/0x20 net/socket.c:1139
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff8880957ec280
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 2024 bytes inside of
 2048-byte region [ffff8880957ec280, ffff8880957eca80)
The buggy address belongs to the page:
page:ffffea000255fb00 count:1 mapcount:0 mapping:ffff8880957ec280 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff8880957ec280 0000000000000000 0000000100000003
raw: ffffea0002c44c20 ffffea0002c69e20 ffff88813fe80c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880957ec900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880957ec980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880957eca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff8880957eca80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880957ecb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (19):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-14 2021/03/30 06:59 linux-4.14.y 670d6552eda8 6a81331a .config log report syz KASAN: use-after-free Read in __netif_receive_skb_core
ci2-linux-4-14 2021/03/04 13:49 linux-4.14.y 397a88b2cc86 d7e4e604 .config log report syz KASAN: use-after-free Read in __netif_receive_skb_core
ci2-linux-4-14 2020/09/22 15:29 linux-4.14.y cbfa1702aaf6 3e8f6c27 .config log report syz
ci2-linux-4-14 2021/07/08 00:19 linux-4.14.y 313e82bbefb3 95793bce .config log report info KASAN: use-after-free Read in __netif_receive_skb_core
ci2-linux-4-14 2021/05/04 23:43 linux-4.14.y 7d7d1c0ab3eb 06c27ff5 .config log report info KASAN: use-after-free Read in __netif_receive_skb_core
ci2-linux-4-14 2021/04/02 23:25 linux-4.14.y bd634aa64163 6a81331a .config log report info KASAN: use-after-free Read in __netif_receive_skb_core
ci2-linux-4-14 2021/03/26 23:12 linux-4.14.y 670d6552eda8 a8529b82 .config log report info KASAN: use-after-free Read in __netif_receive_skb_core
ci2-linux-4-14 2021/03/23 17:30 linux-4.14.y cb83ddcd5332 e613994b .config log report info KASAN: use-after-free Read in __netif_receive_skb_core
ci2-linux-4-14 2021/03/17 20:53 linux-4.14.y cb83ddcd5332 fdb2bb2c .config log report info KASAN: use-after-free Read in __netif_receive_skb_core
ci2-linux-4-14 2021/03/04 12:04 linux-4.14.y 397a88b2cc86 d7e4e604 .config log report info KASAN: use-after-free Read in __netif_receive_skb_core
ci2-linux-4-14 2020/12/07 12:59 linux-4.14.y c196b3a9c83a f80ce148 .config log report info
ci2-linux-4-14 2020/10/01 17:00 linux-4.14.y cbfa1702aaf6 4103fce0 .config log report info
ci2-linux-4-14 2020/09/22 11:02 linux-4.14.y cbfa1702aaf6 3e8f6c27 .config log report info
ci2-linux-4-14 2020/09/10 03:11 linux-4.14.y 458a534cac0c ac7ca78e .config log report
ci2-linux-4-14 2020/08/24 21:52 linux-4.14.y 6a24ca2506d6 67b599d1 .config log report
ci2-linux-4-14 2020/08/12 00:01 linux-4.14.y 14b58326976d bb3e5fe6 .config log report
ci2-linux-4-14 2020/07/15 22:07 linux-4.14.y b850307b279c ada108d0 .config log report
ci2-linux-4-14 2020/06/17 02:39 linux-4.14.y b850307b279c b9f3810b .config log report
ci2-linux-4-14 2020/05/16 19:23 linux-4.14.y ab9dfda23248 37bccd4e .config log report
* Struck through repros no longer work on HEAD.