Warning: Permanently added '10.128.0.208' (ECDSA) to the list of known hosts. executing program [* ] 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 (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 (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 (13s / 1min 30s)[ *** ] A start job is running for dev-ttyS0.device (14s / 1min 30s)[*** ] A start job is running for dev-ttyS0.device (14s / 1min 30s)[** ] A start job is running for dev-ttyS0.device (15s / 1min 30s)[* ] A start job is running for dev-ttyS0.device (15s / 1min 30s)[** ] A start job is running for dev-ttyS0.device (16s / 1min 30s)[*** ] A start job is running for dev-ttyS0.device (16s / 1min 30s)[ *** ] A start job is running for dev-ttyS0.device (17s / 1min 30s)[ 24.007387][ T22] audit: type=1400 audit(1616016146.495:8): avc: denied { execmem } for pid=338 comm="syz-executor293" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 24.007767][ T338] ================================================================== [ 24.035946][ T338] BUG: KASAN: use-after-free in eth_header_parse_protocol+0xad/0xd0 [ 24.043889][ T338] Read of size 2 at addr ffff8881e88f000b by task syz-executor293/338 [ 24.052012][ T338] [ 24.054312][ T338] CPU: 0 PID: 338 Comm: syz-executor293 Not tainted 5.4.106-syzkaller-00698-g3941336d0e38 #0 [ 24.064420][ T338] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.074442][ T338] Call Trace: [ 24.077704][ T338] dump_stack+0x1d8/0x24e [ 24.082002][ T338] ? show_regs_print_info+0x12/0x12 [ 24.087185][ T338] ? printk+0xcf/0x114 [ 24.091234][ T338] print_address_description+0x9b/0x650 [ 24.096756][ T338] ? devkmsg_release+0x11c/0x11c [ 24.101660][ T338] ? page_fault+0x2f/0x40 [ 24.105963][ T338] __kasan_report+0x182/0x260 [ 24.110607][ T338] ? eth_header_parse_protocol+0xad/0xd0 [ 24.116219][ T338] kasan_report+0x30/0x60 [ 24.120514][ T338] eth_header_parse_protocol+0xad/0xd0 [ 24.125946][ T338] ? eth_header_cache_update+0x30/0x30 [ 24.131370][ T338] virtio_net_hdr_to_skb+0x6de/0xd70 [ 24.136625][ T338] ? fanout_demux_bpf+0x230/0x230 [ 24.141630][ T338] ? skb_copy_datagram_from_iter+0x604/0x6b0 [ 24.147573][ T338] packet_sendmsg+0x483a/0x6780 [ 24.152401][ T338] ? stack_trace_save+0x120/0x1f0 [ 24.157395][ T338] ? check_preemption_disabled+0x9e/0x330 [ 24.163092][ T338] ? _raw_spin_lock_bh+0xa3/0x1b0 [ 24.168093][ T338] ? memset+0x1f/0x40 [ 24.172143][ T338] ? selinux_socket_sendmsg+0x11f/0x340 [ 24.177800][ T338] ? selinux_socket_accept+0x5b0/0x5b0 [ 24.183261][ T338] ? compat_packet_setsockopt+0x160/0x160 [ 24.188954][ T338] ? avc_has_perm_noaudit+0x37d/0x400 [ 24.194383][ T338] ? avc_has_perm_noaudit+0x30c/0x400 [ 24.199728][ T338] ? security_socket_sendmsg+0x9d/0xb0 [ 24.205154][ T338] ? compat_packet_setsockopt+0x160/0x160 [ 24.210939][ T338] sock_write_iter+0x330/0x450 [ 24.215682][ T338] ? sock_read_iter+0x430/0x430 [ 24.220505][ T338] ? avc_has_perm_noaudit+0x400/0x400 [ 24.225856][ T338] ? iov_iter_init+0x83/0x160 [ 24.230518][ T338] __vfs_write+0x5ec/0x780 [ 24.234916][ T338] ? __kernel_write+0x340/0x340 [ 24.239739][ T338] ? security_file_permission+0x128/0x300 [ 24.245428][ T338] vfs_write+0x212/0x4e0 [ 24.249640][ T338] ksys_write+0x186/0x2b0 [ 24.254718][ T338] ? debug_smp_processor_id+0x20/0x20 [ 24.260055][ T338] ? __ia32_sys_read+0x80/0x80 [ 24.264787][ T338] do_syscall_64+0xcb/0x1e0 [ 24.269257][ T338] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 24.275113][ T338] RIP: 0033:0x43ef39 [ 24.278985][ T338] 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 [ 24.298555][ T338] RSP: 002b:00007ffd4a23ee78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 24.306936][ T338] RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043ef39 [ 24.314876][ T338] RDX: 000000000000fdef RSI: 0000000020000000 RDI: 0000000000000003 [ 24.322814][ T338] RBP: 0000000000402f20 R08: 0000000000400488 R09: 0000000000400488 [ 24.330754][ T338] R10: 0000000000400488 R11: 0000000000000246 R12: 0000000000402fb0 [ 24.338864][ T338] R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488 [ 24.346805][ T338] [ 24.349102][ T338] Allocated by task 338: [ 24.353313][ T338] __kasan_kmalloc+0x137/0x1e0 [ 24.358054][ T338] kmem_cache_alloc+0x115/0x290 [ 24.362871][ T338] getname_flags+0xba/0x640 [ 24.367340][ T338] user_path_at_empty+0x28/0x50 [ 24.372155][ T338] do_faccessat+0x323/0x7a0 [ 24.376622][ T338] do_syscall_64+0xcb/0x1e0 [ 24.381092][ T338] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 24.386945][ T338] [ 24.389242][ T338] Freed by task 338: [ 24.393104][ T338] __kasan_slab_free+0x18a/0x240 [ 24.398007][ T338] slab_free_freelist_hook+0x7b/0x150 [ 24.405946][ T338] kmem_cache_free+0xb8/0x5f0 [ 24.410587][ T338] filename_lookup+0x4bb/0x6a0 [ 24.415464][ T338] do_faccessat+0x323/0x7a0 [ 24.419948][ T338] do_syscall_64+0xcb/0x1e0 [ 24.424420][ T338] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 24.430276][ T338] [ 24.432577][ T338] The buggy address belongs to the object at ffff8881e88f0000 [ 24.432577][ T338] which belongs to the cache names_cache of size 4096 [ 24.446701][ T338] The buggy address is located 11 bytes inside of [ 24.446701][ T338] 4096-byte region [ffff8881e88f0000, ffff8881e88f1000) [ 24.460211][ T338] The buggy address belongs to the page: [ 24.460223][ T338] page:ffffea0007a23c00 refcount:1 mapcount:0 mapping:ffff8881f5cfb680 index:0x0 compound_mapcount: 0 [ 24.460228][ T338] flags: 0x8000000000010200(slab|head) [ 24.460239][ T338] raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5cfb680 [ 24.490745][ T338] raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 [ 24.499331][ T338] page dumped because: kasan: bad access detected [ 24.505714][ T338] [ 24.508016][ T338] Memory state around the buggy address: [ 24.513636][ T338] ffff8881e88eff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 24.521687][ T338] ffff8881e88eff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 24.529726][ T338] >ffff8881e88f0000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.537762][ T338] ^ [ 24.542086][ T338] ffff8881e88f0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.550145][ T338] ffff8881e88f0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.558205][ T3