Warning: Permanently added '10.128.0.196' (ECDSA) to the list of known hosts. executing program [*** ] 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)[ ***] A start job is running for dev-ttyS0.device (11s / 1min 30s)[ **] A start job is running for dev-ttyS0.device (12s / 1min 30s)[ *] A start job is running for dev-ttyS0.device (12s / 1min 30s)[ **] A start job is running for dev-ttyS0.device (13s / 1min 30s)[ ***] A start job is running for dev-ttyS0.device (14s / 1min 30s)[ 21.454871][ T22] audit: type=1400 audit(1617190501.908:8): avc: denied { execmem } for pid=342 comm="syz-executor008" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 21.455202][ T342] ================================================================== [ 21.483419][ T342] BUG: KASAN: use-after-free in eth_header_parse_protocol+0xad/0xd0 [ 21.491396][ T342] Read of size 2 at addr ffff8881e8c14c0b by task syz-executor008/342 [ 21.499509][ T342] [ 21.501837][ T342] CPU: 0 PID: 342 Comm: syz-executor008 Not tainted 5.4.108-syzkaller-00849-gfb6ec348f060 #0 [ 21.511947][ T342] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.521986][ T342] Call Trace: [ 21.525256][ T342] dump_stack+0x1d8/0x24e [ 21.529565][ T342] ? show_regs_print_info+0x12/0x12 [ 21.534736][ T342] ? printk+0xcf/0x114 [ 21.538795][ T342] print_address_description+0x9b/0x650 [ 21.544316][ T342] ? devkmsg_release+0x11c/0x11c [ 21.549251][ T342] __kasan_report+0x182/0x260 [ 21.553899][ T342] ? eth_header_parse_protocol+0xad/0xd0 [ 21.559499][ T342] kasan_report+0x30/0x60 [ 21.563812][ T342] eth_header_parse_protocol+0xad/0xd0 [ 21.569239][ T342] ? eth_header_cache_update+0x30/0x30 [ 21.574685][ T342] virtio_net_hdr_to_skb+0x6de/0xd70 [ 21.579944][ T342] ? fanout_demux_bpf+0x230/0x230 [ 21.584938][ T342] ? skb_copy_datagram_from_iter+0x5ce/0x6b0 [ 21.590887][ T342] ? skb_put+0x10f/0x1e0 [ 21.595098][ T342] packet_sendmsg+0x483a/0x6780 [ 21.599921][ T342] ? stack_trace_save+0x120/0x1f0 [ 21.604937][ T342] ? check_preemption_disabled+0x9e/0x330 [ 21.610629][ T342] ? _raw_spin_lock_bh+0xa3/0x1b0 [ 21.615629][ T342] ? memset+0x1f/0x40 [ 21.619608][ T342] ? selinux_socket_sendmsg+0x11f/0x340 [ 21.625123][ T342] ? selinux_socket_accept+0x5b0/0x5b0 [ 21.630549][ T342] ? compat_packet_setsockopt+0x160/0x160 [ 21.636256][ T342] ? avc_has_perm_noaudit+0x37d/0x400 [ 21.641601][ T342] ? avc_has_perm_noaudit+0x30c/0x400 [ 21.646953][ T342] ? security_socket_sendmsg+0x9d/0xb0 [ 21.652379][ T342] ? compat_packet_setsockopt+0x160/0x160 [ 21.658065][ T342] sock_write_iter+0x330/0x450 [ 21.662812][ T342] ? sock_read_iter+0x430/0x430 [ 21.667656][ T342] ? avc_has_perm_noaudit+0x400/0x400 [ 21.672996][ T342] ? iov_iter_init+0x83/0x160 [ 21.677651][ T342] __vfs_write+0x5ec/0x780 [ 21.682038][ T342] ? __kernel_write+0x340/0x340 [ 21.686856][ T342] ? security_file_permission+0x128/0x300 [ 21.692561][ T342] vfs_write+0x212/0x4e0 [ 21.696781][ T342] ksys_write+0x186/0x2b0 [ 21.701089][ T342] ? debug_smp_processor_id+0x20/0x20 [ 21.706427][ T342] ? __ia32_sys_read+0x80/0x80 [ 21.711168][ T342] do_syscall_64+0xcb/0x1e0 [ 21.715638][ T342] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 21.721498][ T342] RIP: 0033:0x43ef59 [ 21.725362][ T342] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 21.744941][ T342] RSP: 002b:00007ffea7317b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 21.753322][ T342] RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043ef59 [ 21.761282][ T342] RDX: 000000000000005a RSI: 0000000020000700 RDI: 0000000000000003 [ 21.769222][ T342] RBP: 0000000000402f40 R08: 0000000000400488 R09: 0000000000400488 [ 21.777175][ T342] R10: 0000000000400488 R11: 0000000000000246 R12: 0000000000402fd0 [ 21.785128][ T342] R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488 [ 21.793203][ T342] [ 21.795523][ T342] Allocated by task 338: [ 21.799749][ T342] __kasan_kmalloc+0x137/0x1e0 [ 21.804482][ T342] kmem_cache_alloc+0x115/0x290 [ 21.809297][ T342] getname_flags+0xba/0x640 [ 21.813766][ T342] do_symlinkat+0x96/0x440 [ 21.818153][ T342] do_syscall_64+0xcb/0x1e0 [ 21.822622][ T342] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 21.828486][ T342] [ 21.830783][ T342] Freed by task 338: [ 21.834643][ T342] __kasan_slab_free+0x18a/0x240 [ 21.839548][ T342] slab_free_freelist_hook+0x7b/0x150 [ 21.844897][ T342] kmem_cache_free+0xb8/0x5f0 [ 21.849551][ T342] do_symlinkat+0x3b0/0x440 [ 21.854022][ T342] do_syscall_64+0xcb/0x1e0 [ 21.858488][ T342] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 21.864340][ T342] [ 21.866640][ T342] The buggy address belongs to the object at ffff8881e8c14400 [ 21.866640][ T342] which belongs to the cache names_cache of size 4096 [ 21.880760][ T342] The buggy address is located 2059 bytes inside of [ 21.880760][ T342] 4096-byte region [ffff8881e8c14400, ffff8881e8c15400) [ 21.894335][ T342] The buggy address belongs to the page: [ 21.899955][ T342] page:ffffea0007a30400 refcount:1 mapcount:0 mapping:ffff8881f5cfbb80 index:0x0 compound_mapcount: 0 [ 21.910886][ T342] flags: 0x8000000000010200(slab|head) [ 21.916323][ T342] raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5cfbb80 [ 21.924883][ T342] raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 [ 21.933440][ T342] page dumped because: kasan: bad access detected [ 21.939817][ T342] [ 21.942124][ T342] Memory state around the buggy address: [ 21.947723][ T342] ffff8881e8c14b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 21.955750][ T342] ffff8881e8c14b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 21.963777][ T342] >ffff8881e8c14c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 21.971803][ T342] ^ [ 21.976099][ T342] ffff8881e8c14c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 21.984130][ T342] ffff8881e8c14d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 21.992165][ T342] ================================================================== [ 22.000203][ T342] Disabling lock debugging due to kernel taint [