[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [ 30.305434] kauditd_printk_skb: 9 callbacks suppressed [ 30.305459] audit: type=1800 audit(1538222402.240:33): pid=5317 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 30.341094] audit: type=1800 audit(1538222402.250:34): pid=5317 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 33.310329] audit: type=1400 audit(1538222405.240:35): avc: denied { map } for pid=5494 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts. executing program [ 91.022119] audit: type=1400 audit(1538222462.960:36): avc: denied { map } for pid=5509 comm="syz-executor599" path="/root/syz-executor599970059" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 91.049904] raw_sendmsg: syz-executor599 forgot to set AF_INET. Fix it! executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 91.910392] ================================================================== [ 91.917922] BUG: KASAN: use-after-free in ip_cmsg_recv_offset+0x12be/0x1390 [ 91.925008] Read of size 4 at addr ffff8801d8ae35a0 by task syz-executor599/5559 [ 91.932518] [ 91.934132] CPU: 1 PID: 5559 Comm: syz-executor599 Not tainted 4.19.0-rc5+ #38 [ 91.941578] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 91.950914] Call Trace: [ 91.953487] dump_stack+0x1c4/0x2b4 [ 91.957124] ? dump_stack_print_info.cold.2+0x52/0x52 [ 91.962304] ? printk+0xa7/0xcf [ 91.965563] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 91.970302] print_address_description.cold.8+0x9/0x1ff [ 91.975659] kasan_report.cold.9+0x242/0x309 [ 91.980049] ? ip_cmsg_recv_offset+0x12be/0x1390 [ 91.984790] __asan_report_load4_noabort+0x14/0x20 [ 91.989722] ip_cmsg_recv_offset+0x12be/0x1390 [ 91.994292] ? ip_send_unicast_reply+0x1770/0x1770 [ 91.999209] ? _copy_to_iter+0x1540/0x1540 [ 92.003431] ? rcu_lockdep_current_cpu_online+0x1f0/0x2d0 [ 92.008950] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 92.014207] ? rcu_pm_notify+0xc0/0xc0 [ 92.018090] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.023623] ? skb_copy_datagram_iter+0x26e/0xc10 [ 92.028455] ? __sk_queue_drop_skb+0x1f0/0x1f0 [ 92.033025] ? check_preemption_disabled+0x48/0x200 [ 92.038024] ? kasan_check_read+0x11/0x20 [ 92.042150] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 92.047410] raw_recvmsg+0x71d/0x8b0 [ 92.051123] ? raw_abort+0xa0/0xa0 [ 92.054647] ? sock_has_perm+0x2bc/0x3e0 [ 92.058691] ? selinux_secmark_relabel_packet+0xe0/0xe0 [ 92.064041] inet_recvmsg+0x181/0x6d0 [ 92.067825] ? inet_sendpage+0x740/0x740 [ 92.071872] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.077390] ? security_socket_recvmsg+0x9c/0xc0 [ 92.082127] ? inet_sendpage+0x740/0x740 [ 92.086189] sock_recvmsg+0xd0/0x110 [ 92.089896] sock_read_iter+0x39b/0x570 [ 92.093869] ? sock_recvmsg+0x110/0x110 [ 92.097830] ? __might_sleep+0x95/0x190 [ 92.101798] do_iter_readv_writev+0x77c/0xa80 [ 92.106280] ? vfs_dedupe_file_range+0x670/0x670 [ 92.111034] ? rw_verify_area+0x118/0x360 [ 92.115172] do_iter_read+0x26e/0x650 [ 92.118959] ? dup_iter+0x270/0x270 [ 92.122573] vfs_readv+0x175/0x1c0 [ 92.126099] ? compat_rw_copy_check_uvector+0x440/0x440 [ 92.131447] ? __ia32_sys_getpeername+0xb0/0xb0 [ 92.136097] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.141624] ? selinux_netlbl_socket_setsockopt+0xf1/0x520 [ 92.147261] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.152786] ? __fdget_pos+0xde/0x200 [ 92.156569] ? __fdget_raw+0x20/0x20 [ 92.160262] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 92.165780] ? fput+0x130/0x1a0 [ 92.169050] do_readv+0x11a/0x310 [ 92.172487] ? vfs_readv+0x1c0/0x1c0 [ 92.176186] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 92.181623] __x64_sys_readv+0x75/0xb0 [ 92.185496] do_syscall_64+0x1b9/0x820 [ 92.189366] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 92.194766] ? syscall_return_slowpath+0x5e0/0x5e0 [ 92.199683] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 92.204509] ? trace_hardirqs_on_caller+0x310/0x310 [ 92.209506] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 92.214507] ? prepare_exit_to_usermode+0x291/0x3b0 [ 92.219508] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 92.224334] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 92.229501] RIP: 0033:0x446469 [ 92.232682] Code: e8 2c b3 02 00 48 83 c4 18 c3 0f 1f 80 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 0f 83 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 92.252497] RSP: 002b:00007f95a2e5fda8 EFLAGS: 00000293 ORIG_RAX: 0000000000000013 [ 92.262417] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446469 [ 92.271381] RDX: 0000000000000001 RSI: 0000000020000500 RDI: 0000000000000003 [ 92.278633] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 92.285886] R10: 000000000000006e R11: 0000000000000293 R12: 00000000006dbc2c [ 92.293140] R13: 00000000004ae560 R14: 0000000020001300 R15: 00000000006dbd2c [ 92.300412] [ 92.302026] Allocated by task 5559: [ 92.305645] save_stack+0x43/0xd0 [ 92.309082] kasan_kmalloc+0xc7/0xe0 [ 92.312778] __kmalloc_node_track_caller+0x47/0x70 [ 92.317688] __kmalloc_reserve.isra.39+0x41/0xe0 [ 92.322505] __alloc_skb+0x155/0x770 [ 92.326262] __ip_append_data.isra.47+0x21d6/0x29b0 [ 92.331264] ip_append_data.part.48+0xef/0x170 [ 92.335824] ip_append_data+0x6d/0x90 [ 92.339609] raw_sendmsg+0x1220/0x4380 [ 92.343501] inet_sendmsg+0x1a1/0x690 [ 92.347278] sock_sendmsg+0xd5/0x120 [ 92.350972] __sys_sendto+0x3d7/0x670 [ 92.354754] __x64_sys_sendto+0xe1/0x1a0 [ 92.358811] do_syscall_64+0x1b9/0x820 [ 92.362683] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 92.367846] [ 92.369451] Freed by task 5559: [ 92.372801] save_stack+0x43/0xd0 [ 92.376416] __kasan_slab_free+0x102/0x150 [ 92.380634] kasan_slab_free+0xe/0x10 [ 92.384430] kfree+0xcf/0x230 [ 92.387516] skb_free_head+0x99/0xc0 [ 92.391292] pskb_expand_head+0x3bb/0x10f0 [ 92.395513] __pskb_pull_tail+0x156/0x1890 [ 92.399778] ip_cmsg_recv_offset+0x113b/0x1390 [ 92.404351] raw_recvmsg+0x71d/0x8b0 [ 92.408045] inet_recvmsg+0x181/0x6d0 [ 92.411836] sock_recvmsg+0xd0/0x110 [ 92.415528] sock_read_iter+0x39b/0x570 [ 92.419491] do_iter_readv_writev+0x77c/0xa80 [ 92.423966] do_iter_read+0x26e/0x650 [ 92.427749] vfs_readv+0x175/0x1c0 [ 92.431268] do_readv+0x11a/0x310 [ 92.434703] __x64_sys_readv+0x75/0xb0 [ 92.438585] do_syscall_64+0x1b9/0x820 [ 92.442456] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 92.447616] [ 92.449239] The buggy address belongs to the object at ffff8801d8ae3580 [ 92.449239] which belongs to the cache kmalloc-512 of size 512 [ 92.461897] The buggy address is located 32 bytes inside of [ 92.461897] 512-byte region [ffff8801d8ae3580, ffff8801d8ae3780) [ 92.473660] The buggy address belongs to the page: [ 92.478571] page:ffffea000762b8c0 count:1 mapcount:0 mapping:ffff8801da800940 index:0x0 [ 92.486694] flags: 0x2fffc0000000100(slab) [ 92.491013] raw: 02fffc0000000100 ffffea00075f2708 ffffea0007555488 ffff8801da800940 [ 92.498876] raw: 0000000000000000 ffff8801d8ae3080 0000000100000006 0000000000000000 [ 92.506739] page dumped because: kasan: bad access detected [ 92.512429] [ 92.514043] Memory state around the buggy address: [ 92.519590] ffff8801d8ae3480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 92.526929] ffff8801d8ae3500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 92.534271] >ffff8801d8ae3580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 92.541606] ^ [ 92.545991] ffff8801d8ae3600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 92.554998] ffff8801d8ae3680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 92.562340] ================================================================== [ 92.569676] Disabling lock debugging due to kernel taint [ 92.575724] Kernel panic - not syncing: panic_on_warn set ... [ 92.575724] [ 92.583088] CPU: 1 PID: 5559 Comm: syz-executor599 Tainted: G B 4.19.0-rc5+ #38 [ 92.591817] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 92.601209] Call Trace: [ 92.603785] dump_stack+0x1c4/0x2b4 [ 92.607397] ? dump_stack_print_info.cold.2+0x52/0x52 [ 92.612572] panic+0x238/0x4e7 [ 92.615745] ? add_taint.cold.5+0x16/0x16 [ 92.619875] ? preempt_schedule+0x4d/0x60 [ 92.624004] ? ___preempt_schedule+0x16/0x18 [ 92.628398] ? trace_hardirqs_on+0xb4/0x310 [ 92.632705] kasan_end_report+0x47/0x4f [ 92.636666] kasan_report.cold.9+0x76/0x309 [ 92.640993] ? ip_cmsg_recv_offset+0x12be/0x1390 [ 92.645843] __asan_report_load4_noabort+0x14/0x20 [ 92.650754] ip_cmsg_recv_offset+0x12be/0x1390 [ 92.655327] ? ip_send_unicast_reply+0x1770/0x1770 [ 92.660238] ? _copy_to_iter+0x1540/0x1540 [ 92.664457] ? rcu_lockdep_current_cpu_online+0x1f0/0x2d0 [ 92.669974] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 92.675831] ? rcu_pm_notify+0xc0/0xc0 [ 92.680144] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.685673] ? skb_copy_datagram_iter+0x26e/0xc10 [ 92.690507] ? __sk_queue_drop_skb+0x1f0/0x1f0 [ 92.695080] ? check_preemption_disabled+0x48/0x200 [ 92.700077] ? kasan_check_read+0x11/0x20 [ 92.704208] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 92.709467] raw_recvmsg+0x71d/0x8b0 [ 92.713164] ? raw_abort+0xa0/0xa0 [ 92.716685] ? sock_has_perm+0x2bc/0x3e0 [ 92.720727] ? selinux_secmark_relabel_packet+0xe0/0xe0 [ 92.726072] inet_recvmsg+0x181/0x6d0 [ 92.729855] ? inet_sendpage+0x740/0x740 [ 92.733923] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.739448] ? security_socket_recvmsg+0x9c/0xc0 [ 92.744183] ? inet_sendpage+0x740/0x740 [ 92.748237] sock_recvmsg+0xd0/0x110 [ 92.751937] sock_read_iter+0x39b/0x570 [ 92.755898] ? sock_recvmsg+0x110/0x110 [ 92.759856] ? __might_sleep+0x95/0x190 [ 92.763819] do_iter_readv_writev+0x77c/0xa80 [ 92.768299] ? vfs_dedupe_file_range+0x670/0x670 [ 92.773035] ? rw_verify_area+0x118/0x360 [ 92.777164] do_iter_read+0x26e/0x650 [ 92.780946] ? dup_iter+0x270/0x270 [ 92.784569] vfs_readv+0x175/0x1c0 [ 92.788096] ? compat_rw_copy_check_uvector+0x440/0x440 [ 92.793439] ? __ia32_sys_getpeername+0xb0/0xb0 [ 92.798115] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.803634] ? selinux_netlbl_socket_setsockopt+0xf1/0x520 [ 92.809257] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.814775] ? __fdget_pos+0xde/0x200 [ 92.818557] ? __fdget_raw+0x20/0x20 [ 92.822253] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 92.827766] ? fput+0x130/0x1a0 [ 92.831042] do_readv+0x11a/0x310 [ 92.834487] ? vfs_readv+0x1c0/0x1c0 [ 92.838182] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 92.843620] __x64_sys_readv+0x75/0xb0 [ 92.847503] do_syscall_64+0x1b9/0x820 [ 92.851372] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 92.856715] ? syscall_return_slowpath+0x5e0/0x5e0 [ 92.861625] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 92.866448] ? trace_hardirqs_on_caller+0x310/0x310 [ 92.871444] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 92.876438] ? prepare_exit_to_usermode+0x291/0x3b0 [ 92.881433] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 92.886254] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 92.891421] RIP: 0033:0x446469 [ 92.894597] Code: e8 2c b3 02 00 48 83 c4 18 c3 0f 1f 80 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 0f 83 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 92.915397] RSP: 002b:00007f95a2e5fda8 EFLAGS: 00000293 ORIG_RAX: 0000000000000013 [ 92.923089] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446469 [ 92.930350] RDX: 0000000000000001 RSI: 0000000020000500 RDI: 0000000000000003 [ 92.937657] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 92.944911] R10: 000000000000006e R11: 0000000000000293 R12: 00000000006dbc2c [ 92.952160] R13: 00000000004ae560 R14: 0000000020001300 R15: 00000000006dbd2c [ 92.960495] Kernel Offset: disabled [ 92.964115] Rebooting in 86400 seconds..