Starting Permit User Sessions... Starting OpenBSD Secure Shell server... [ OK ] Started Permit User Sessions. [ OK ] Started Getty on tty1. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty4. [ OK ] Started OpenBSD Secure Shell server. Warning: Permanently added '10.128.0.208' (ECDSA) to the list of known hosts. [* ] A start job is running for dev-ttyS0.device (8s / 1min 30s)[** ] A start job is running for dev-ttyS0.device (9s / 1min 30s)[*** ] A start job is running for dev-ttyS0.device (10s / 1min 30s)[ *** ] A start job is running for dev-ttyS0.device (10s / 1min 30s)[ 19.007305][ T22] audit: type=1400 audit(1616623415.725:8): avc: denied { execmem } for pid=348 comm="syz-executor106" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ *** ] A start job is running for dev-ttyS0.device (11s / 1min 30s)[ 19.053583][ T349] bridge0: port 1(bridge_slave_0) entered blocking state [ 19.060706][ T349] bridge0: port 1(bridge_slave_0) entered disabled state [ 19.068457][ T349] device bridge_slave_0 entered promiscuous mode [ 19.075557][ T349] bridge0: port 2(bridge_slave_1) entered blocking state [ 19.082832][ T349] bridge0: port 2(bridge_slave_1) entered disabled state [ 19.090131][ T349] device bridge_slave_1 entered promiscuous mode [ 19.127208][ T349] bridge0: port 2(bridge_slave_1) entered blocking state [ 19.134366][ T349] bridge0: port 2(bridge_slave_1) entered forwarding state [ 19.141599][ T349] bridge0: port 1(bridge_slave_0) entered blocking state [ 19.148621][ T349] bridge0: port 1(bridge_slave_0) entered forwarding state [ 19.168802][ T67] bridge0: port 1(bridge_slave_0) entered disabled state [ 19.176237][ T67] bridge0: port 2(bridge_slave_1) entered disabled state [ 19.184711][ T67] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 19.192082][ T67] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 19.213796][ T148] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 19.221931][ T148] bridge0: port 1(bridge_slave_0) entered blocking state [ 19.228968][ T148] bridge0: port 1(bridge_slave_0) entered forwarding state [ 19.236387][ T148] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 19.245751][ T148] bridge0: port 2(bridge_slave_1) entered blocking state [ 19.252848][ T148] bridge0: port 2(bridge_slave_1) entered forwarding state [ 19.260151][ T148] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 19.268203][ T148] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 19.277735][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 19.293759][ T97] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 19.301653][ T97] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 19.317753][ T67] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready executing program [ 19.326228][ T67] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 19.390521][ T357] ================================================================== [ 19.398625][ T357] BUG: KASAN: use-after-free in eth_header_parse_protocol+0xad/0xd0 [ 19.406576][ T357] Read of size 2 at addr ffff8881e84a800b by task syz-executor106/357 [ 19.414692][ T357] [ 19.417032][ T357] CPU: 1 PID: 357 Comm: syz-executor106 Not tainted 5.4.107-syzkaller-00754-g32de11228337 #0 [ 19.427145][ T357] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.437171][ T357] Call Trace: [ 19.440435][ T357] dump_stack+0x1d8/0x24e [ 19.444742][ T357] ? gfp_pfmemalloc_allowed+0x120/0x120 [ 19.450260][ T357] ? show_regs_print_info+0x12/0x12 [ 19.455435][ T357] ? printk+0xcf/0x114 [ 19.459480][ T357] print_address_description+0x9b/0x650 [ 19.464999][ T357] ? devkmsg_release+0x11c/0x11c [ 19.469908][ T357] ? _copy_from_iter+0x84d/0xa80 [ 19.474830][ T357] ? memcpy+0x38/0x50 [ 19.478819][ T357] __kasan_report+0x182/0x260 [ 19.483468][ T357] ? eth_header_parse_protocol+0xad/0xd0 [ 19.489069][ T357] kasan_report+0x30/0x60 [ 19.493392][ T357] eth_header_parse_protocol+0xad/0xd0 [ 19.498824][ T357] ? eth_header_cache_update+0x30/0x30 [ 19.504290][ T357] virtio_net_hdr_to_skb+0x6de/0xd70 [ 19.509555][ T357] ? fanout_demux_bpf+0x230/0x230 [ 19.514557][ T357] ? skb_copy_datagram_from_iter+0x604/0x6b0 [ 19.520517][ T357] packet_sendmsg+0x483a/0x6780 [ 19.526020][ T357] ? memset+0x1f/0x40 [ 19.530006][ T357] ? selinux_socket_sendmsg+0x11f/0x340 [ 19.535542][ T357] ? selinux_socket_accept+0x5b0/0x5b0 write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/vm/nr_overcommit_hugepages failed: No such file or directory [ 19.541101][ T357] ? compat_packet_setsockopt+0x160/0x160 [ 19.546811][ T357] ? security_socket_sendmsg+0x9d/0xb0 [ 19.552257][ T357] ? compat_packet_setsockopt+0x160/0x160 [ 19.557954][ T357] kernel_sendmsg+0xf5/0x130 [ 19.562544][ T357] sock_no_sendpage+0x143/0x1b0 [ 19.567373][ T357] ? __receive_sock+0xe0/0xe0 [ 19.572024][ T357] ? avc_has_perm_noaudit+0x37d/0x400 [ 19.577373][ T357] ? avc_has_perm_noaudit+0x30c/0x400 [ 19.582720][ T357] ? __receive_sock+0xe0/0xe0 [ 19.587391][ T357] sock_sendpage+0xd0/0x120 [ 19.591881][ T357] pipe_to_sendpage+0x23b/0x300 [ 19.596700][ T357] ? sock_fasync+0xf0/0xf0 [ 19.601085][ T357] ? generic_splice_sendpage+0x210/0x210 [ 19.606700][ T357] ? avc_has_perm+0xd2/0x270 [ 19.611257][ T357] ? avc_has_perm+0x173/0x270 [ 19.615903][ T357] __splice_from_pipe+0x2d3/0x870 [ 19.620912][ T357] ? generic_splice_sendpage+0x210/0x210 [ 19.626513][ T357] generic_splice_sendpage+0x181/0x210 [ 19.631940][ T357] ? iter_file_splice_write+0xf20/0xf20 [ 19.637462][ T357] ? security_file_permission+0x128/0x300 [ 19.643153][ T357] ? iter_file_splice_write+0xf20/0xf20 [ 19.648670][ T357] __se_sys_splice+0x7a8/0x1b00 [ 19.653494][ T357] ? check_preemption_disabled+0x154/0x330 [ 19.659270][ T357] ? debug_smp_processor_id+0x20/0x20 [ 19.664607][ T357] ? __fpregs_load_activate+0x1d7/0x3c0 [ 19.670119][ T357] ? __x64_sys_splice+0xf0/0xf0 [ 19.674936][ T357] ? finish_task_switch+0x1b9/0x550 [ 19.680115][ T357] ? __x64_sys_splice+0x1d/0xf0 [ 19.684935][ T357] do_syscall_64+0xcb/0x1e0 [ 19.689426][ T357] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 19.695301][ T357] RIP: 0033:0x4504b9 [ 19.699165][ T357] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 18 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 19.718738][ T357] RSP: 002b:00007ffbff23c2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 [ 19.727115][ T357] RAX: ffffffffffffffda RBX: 00000000004cf4f8 RCX: 00000000004504b9 [ 19.735077][ T357] RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000005 [ 19.743019][ T357] RBP: 00000000004cf4f0 R08: 0000000004f44115 R09: 0000000000000000 [ 19.750972][ T357] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004cf4fc [ 19.758919][ T357] R13: 000000000049e004 R14: 6d32cc5e8ead0600 R15: 0000000000022000 [ 19.766867][ T357] [ 19.769167][ T357] Allocated by task 154: [ 19.773405][ T357] __kasan_kmalloc+0x137/0x1e0 [ 19.778152][ T357] kmem_cache_alloc+0x115/0x290 [ 19.782972][ T357] getname_flags+0xba/0x640 [ 19.787443][ T357] do_mkdirat+0x9e/0x330 [ 19.791652][ T357] do_syscall_64+0xcb/0x1e0 [ 19.796121][ T357] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 19.801975][ T357] [ 19.804277][ T357] Freed by task 154: [ 19.808151][ T357] __kasan_slab_free+0x18a/0x240 [ 19.813206][ T357] slab_free_freelist_hook+0x7b/0x150 [ 19.818566][ T357] kmem_cache_free+0xb8/0x5f0 [ 19.823223][ T357] filename_create+0x4c7/0x770 [ 19.827976][ T357] do_mkdirat+0xbc/0x330 [ 19.832188][ T357] do_syscall_64+0xcb/0x1e0 [ 19.836659][ T357] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 19.842530][ T357] [ 19.844831][ T357] The buggy address belongs to the object at ffff8881e84a8000 [ 19.844831][ T357] which belongs to the cache names_cache of size 4096 [ 19.858937][ T357] The buggy address is located 11 bytes inside of [ 19.858937][ T357] 4096-byte region [ffff8881e84a8000, ffff8881e84a9000) [ 19.872172][ T357] The buggy address belongs to the page: [ 19.877776][ T357] page:ffffea0007a12a00 refcount:1 mapcount:0 mapping:ffff8881f5cfa780 index:0xffff8881e84a9100 compound_mapcount: 0 [ 19.889973][ T357] flags: 0x8000000000010200(slab|head) [ 19.895401][ T357] raw: 8000000000010200 0000000000000000 0000000100000001 ffff8881f5cfa780 [ 19.903950][ T357] raw: ffff8881e84a9100 0000000080070000 00000001ffffffff 0000000000000000 [ 19.912497][ T357] page dumped because: kasan: bad access detected [ 19.918872][ T357] [ 19.921186][ T357] Memory state around the buggy address: [ 19.926784][ T357] ffff8881e84a7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.934811][ T357] ffff8881e84a7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/vm/nr_overcommit_hugepages failed: No such file or directory [