[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.862430] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.711084] random: sshd: uninitialized urandom read (32 bytes read) [ 24.108009] random: sshd: uninitialized urandom read (32 bytes read) [ 24.827909] random: sshd: uninitialized urandom read (32 bytes read) [ 24.987084] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.22' (ECDSA) to the list of known hosts. [ 30.475680] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.582640] ================================================================== [ 30.590096] BUG: KASAN: use-after-free in tls_sk_proto_close+0x8ab/0x9c0 [ 30.596915] Read of size 1 at addr ffff8801af6bc258 by task syz-executor060/4490 [ 30.604423] [ 30.606040] CPU: 0 PID: 4490 Comm: syz-executor060 Not tainted 4.17.0-rc3+ #34 [ 30.613378] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.622711] Call Trace: [ 30.625291] dump_stack+0x1b9/0x294 [ 30.628897] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.634077] ? printk+0x9e/0xba [ 30.637336] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 30.642072] ? kasan_check_write+0x14/0x20 [ 30.646287] print_address_description+0x6c/0x20b [ 30.651121] ? tls_sk_proto_close+0x8ab/0x9c0 [ 30.655595] kasan_report.cold.7+0x242/0x2fe [ 30.659986] __asan_report_load1_noabort+0x14/0x20 [ 30.664908] tls_sk_proto_close+0x8ab/0x9c0 [ 30.669217] ? __save_stack_trace+0x7e/0xd0 [ 30.673522] ? tcp_check_oom+0x520/0x520 [ 30.677565] ? tls_write_space+0x340/0x340 [ 30.681782] ? graph_lock+0x170/0x170 [ 30.685564] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.691081] ? locks_remove_file+0x3f7/0x5a0 [ 30.695474] ? fcntl_setlk+0x1020/0x1020 [ 30.699528] ? ip_mc_drop_socket+0x20f/0x270 [ 30.703917] inet_release+0x104/0x1f0 [ 30.707700] sock_release+0x96/0x1b0 [ 30.711393] ? sock_alloc_file+0x4e0/0x4e0 [ 30.715606] sock_close+0x16/0x20 [ 30.719045] __fput+0x34d/0x890 [ 30.722309] ? fput+0x1a0/0x1a0 [ 30.725569] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.730049] ____fput+0x15/0x20 [ 30.733330] task_work_run+0x1e4/0x290 [ 30.737200] ? task_work_cancel+0x240/0x240 [ 30.741509] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.747036] ? switch_task_namespaces+0xa2/0xd0 [ 30.751689] do_exit+0x1aee/0x2730 [ 30.755233] ? kasan_check_read+0x11/0x20 [ 30.759391] ? mm_update_next_owner+0x980/0x980 [ 30.764049] ? _raw_spin_unlock+0x22/0x30 [ 30.768197] ? __queue_work+0x685/0x13f0 [ 30.772241] ? __lock_is_held+0xb5/0x140 [ 30.776285] ? flush_rcu_work+0x90/0x90 [ 30.780241] ? print_usage_bug+0xc0/0xc0 [ 30.784281] ? graph_lock+0x170/0x170 [ 30.788060] ? graph_lock+0x170/0x170 [ 30.791846] ? find_held_lock+0x36/0x1c0 [ 30.795891] ? lock_downgrade+0x8e0/0x8e0 [ 30.800028] ? lock_downgrade+0x8e0/0x8e0 [ 30.804179] ? kasan_check_read+0x11/0x20 [ 30.808317] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.812706] ? __local_bh_enable_ip+0x161/0x230 [ 30.817358] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.822354] ? release_sock+0x1e2/0x2b0 [ 30.826309] ? trace_hardirqs_on+0xd/0x10 [ 30.830440] ? __local_bh_enable_ip+0x161/0x230 [ 30.835091] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.839481] ? release_sock+0x1e2/0x2b0 [ 30.843443] ? __release_sock+0x3a0/0x3a0 [ 30.847578] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.853098] ? _copy_from_user+0xdf/0x150 [ 30.857231] ? tls_setsockopt+0xb2/0x780 [ 30.861282] ? sock_common_setsockopt+0x9a/0xe0 [ 30.865935] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.871453] ? __sys_setsockopt+0x24f/0x390 [ 30.875759] do_group_exit+0x16f/0x430 [ 30.879630] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.885148] ? __ia32_sys_exit+0x50/0x50 [ 30.889198] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.894039] ? do_syscall_64+0x92/0x800 [ 30.898008] __x64_sys_exit_group+0x3e/0x50 [ 30.902320] do_syscall_64+0x1b1/0x800 [ 30.906193] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.911028] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.915953] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.920866] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.926217] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.931053] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.936233] RIP: 0033:0x43ea58 [ 30.939402] RSP: 002b:00007ffffafc93a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.947091] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea58 [ 30.954342] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.961592] RBP: 00000000004be400 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.968841] R10: 0000000020000100 R11: 0000000000000246 R12: 0000000000000001 [ 30.976099] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.983366] [ 30.984974] Allocated by task 4490: [ 30.988588] save_stack+0x43/0xd0 [ 30.992030] kasan_kmalloc+0xc4/0xe0 [ 30.995729] kmem_cache_alloc_trace+0x152/0x780 [ 31.000377] tls_init+0x1f9/0xb00 [ 31.003810] tcp_set_ulp+0x1bc/0x520 [ 31.007506] do_tcp_setsockopt.isra.39+0x44a/0x2600 [ 31.012503] tcp_setsockopt+0xc1/0xe0 [ 31.016298] sock_common_setsockopt+0x9a/0xe0 [ 31.020777] __sys_setsockopt+0x1bd/0x390 [ 31.024905] __x64_sys_setsockopt+0xbe/0x150 [ 31.029294] do_syscall_64+0x1b1/0x800 [ 31.033165] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.038350] [ 31.039958] Freed by task 4490: [ 31.043222] save_stack+0x43/0xd0 [ 31.046673] __kasan_slab_free+0x11a/0x170 [ 31.050890] kasan_slab_free+0xe/0x10 [ 31.054680] kfree+0xd9/0x260 [ 31.057769] tls_sw_free_resources+0x2a3/0x360 [ 31.062332] tls_sk_proto_close+0x67c/0x9c0 [ 31.066634] inet_release+0x104/0x1f0 [ 31.070426] sock_release+0x96/0x1b0 [ 31.074121] sock_close+0x16/0x20 [ 31.077553] __fput+0x34d/0x890 [ 31.080811] ____fput+0x15/0x20 [ 31.084080] task_work_run+0x1e4/0x290 [ 31.087948] do_exit+0x1aee/0x2730 [ 31.091467] do_group_exit+0x16f/0x430 [ 31.095335] __x64_sys_exit_group+0x3e/0x50 [ 31.099637] do_syscall_64+0x1b1/0x800 [ 31.103515] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.108680] [ 31.110289] The buggy address belongs to the object at ffff8801af6bc200 [ 31.110289] which belongs to the cache kmalloc-256 of size 256 [ 31.122928] The buggy address is located 88 bytes inside of [ 31.122928] 256-byte region [ffff8801af6bc200, ffff8801af6bc300) [ 31.134694] The buggy address belongs to the page: [ 31.139621] page:ffffea0006bdaf00 count:1 mapcount:0 mapping:ffff8801af6bc0c0 index:0x0 [ 31.147746] flags: 0x2fffc0000000100(slab) [ 31.151965] raw: 02fffc0000000100 ffff8801af6bc0c0 0000000000000000 000000010000000c [ 31.159828] raw: ffffea0006b961a0 ffffea0006b6f4e0 ffff8801da8007c0 0000000000000000 [ 31.167691] page dumped because: kasan: bad access detected [ 31.173376] [ 31.174978] Memory state around the buggy address: [ 31.179885] ffff8801af6bc100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.187222] ffff8801af6bc180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 31.194559] >ffff8801af6bc200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.201903] ^ [ 31.208115] ffff8801af6bc280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.215461] ffff8801af6bc300: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 31.222798] ================================================================== [ 31.230140] Disabling lock debugging due to kernel taint [ 31.235632] Kernel panic - not syncing: panic_on_warn set ... [ 31.235632] [ 31.243004] CPU: 0 PID: 4490 Comm: syz-executor060 Tainted: G B 4.17.0-rc3+ #34 [ 31.251742] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.261078] Call Trace: [ 31.263652] dump_stack+0x1b9/0x294 [ 31.267260] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.272434] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.277961] ? tls_sk_proto_close+0x7f0/0x9c0 [ 31.282441] panic+0x22f/0x4de [ 31.285614] ? add_taint.cold.5+0x16/0x16 [ 31.289750] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.294156] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.298550] ? tls_sk_proto_close+0x8ab/0x9c0 [ 31.303032] kasan_end_report+0x47/0x4f [ 31.306993] kasan_report.cold.7+0x76/0x2fe [ 31.311301] __asan_report_load1_noabort+0x14/0x20 [ 31.316212] tls_sk_proto_close+0x8ab/0x9c0 [ 31.320513] ? __save_stack_trace+0x7e/0xd0 [ 31.324814] ? tcp_check_oom+0x520/0x520 [ 31.328854] ? tls_write_space+0x340/0x340 [ 31.333070] ? graph_lock+0x170/0x170 [ 31.336852] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.342370] ? locks_remove_file+0x3f7/0x5a0 [ 31.346761] ? fcntl_setlk+0x1020/0x1020 [ 31.350803] ? ip_mc_drop_socket+0x20f/0x270 [ 31.355200] inet_release+0x104/0x1f0 [ 31.358982] sock_release+0x96/0x1b0 [ 31.362675] ? sock_alloc_file+0x4e0/0x4e0 [ 31.366890] sock_close+0x16/0x20 [ 31.370331] __fput+0x34d/0x890 [ 31.373596] ? fput+0x1a0/0x1a0 [ 31.376860] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.381333] ____fput+0x15/0x20 [ 31.384589] task_work_run+0x1e4/0x290 [ 31.388455] ? task_work_cancel+0x240/0x240 [ 31.392764] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.398286] ? switch_task_namespaces+0xa2/0xd0 [ 31.402937] do_exit+0x1aee/0x2730 [ 31.406462] ? kasan_check_read+0x11/0x20 [ 31.410590] ? mm_update_next_owner+0x980/0x980 [ 31.415243] ? _raw_spin_unlock+0x22/0x30 [ 31.419373] ? __queue_work+0x685/0x13f0 [ 31.423410] ? __lock_is_held+0xb5/0x140 [ 31.427458] ? flush_rcu_work+0x90/0x90 [ 31.431409] ? print_usage_bug+0xc0/0xc0 [ 31.435456] ? graph_lock+0x170/0x170 [ 31.439233] ? graph_lock+0x170/0x170 [ 31.443017] ? find_held_lock+0x36/0x1c0 [ 31.447068] ? lock_downgrade+0x8e0/0x8e0 [ 31.451194] ? lock_downgrade+0x8e0/0x8e0 [ 31.455324] ? kasan_check_read+0x11/0x20 [ 31.459449] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.463837] ? __local_bh_enable_ip+0x161/0x230 [ 31.468486] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.473479] ? release_sock+0x1e2/0x2b0 [ 31.477433] ? trace_hardirqs_on+0xd/0x10 [ 31.481560] ? __local_bh_enable_ip+0x161/0x230 [ 31.486216] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.490602] ? release_sock+0x1e2/0x2b0 [ 31.494555] ? __release_sock+0x3a0/0x3a0 [ 31.498686] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.504204] ? _copy_from_user+0xdf/0x150 [ 31.508333] ? tls_setsockopt+0xb2/0x780 [ 31.512376] ? sock_common_setsockopt+0x9a/0xe0 [ 31.517034] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.522552] ? __sys_setsockopt+0x24f/0x390 [ 31.526861] do_group_exit+0x16f/0x430 [ 31.530737] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.536255] ? __ia32_sys_exit+0x50/0x50 [ 31.540295] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.545136] ? do_syscall_64+0x92/0x800 [ 31.549098] __x64_sys_exit_group+0x3e/0x50 [ 31.553414] do_syscall_64+0x1b1/0x800 [ 31.557289] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.562120] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.567048] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.571966] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.577313] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.582133] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.587302] RIP: 0033:0x43ea58 [ 31.590474] RSP: 002b:00007ffffafc93a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.598167] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea58 [ 31.605412] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.612661] RBP: 00000000004be400 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.619907] R10: 0000000020000100 R11: 0000000000000246 R12: 0000000000000001 [ 31.627153] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.634887] Dumping ftrace buffer: [ 31.638408] (ftrace buffer empty) [ 31.642095] Kernel Offset: disabled [ 31.645702] Rebooting in 86400 seconds..