[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 31.543771] random: sshd: uninitialized urandom read (32 bytes read) [ 31.892639] kauditd_printk_skb: 10 callbacks suppressed [ 31.892647] audit: type=1400 audit(1575911402.897:35): avc: denied { map } for pid=6966 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 [ 31.948636] random: sshd: uninitialized urandom read (32 bytes read) [ 32.531409] random: sshd: uninitialized urandom read (32 bytes read) [ 40.896199] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.253' (ECDSA) to the list of known hosts. [ 46.451656] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 46.573221] audit: type=1400 audit(1575911417.577:36): avc: denied { map } for pid=6980 comm="syz-executor237" path="/root/syz-executor237277072" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 46.656632] BUG: unable to handle kernel paging request at 000000010000000e [ 46.656648] IP: do_con_trol+0x2fac/0x5b40 [ 46.656650] PGD 8ea9a067 P4D 8ea9a067 PUD 0 [ 46.656663] Oops: 0002 [#1] PREEMPT SMP KASAN [ 46.656667] Modules linked in: [ 46.656677] CPU: 1 PID: 6980 Comm: syz-executor237 Not tainted 4.14.158-syzkaller #0 [ 46.656681] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.656685] task: ffff8880a950c300 task.stack: ffff888098ec0000 [ 46.656692] RIP: 0010:do_con_trol+0x2fac/0x5b40 [ 46.656696] RSP: 0018:ffff888098ec7878 EFLAGS: 00010202 [ 46.656702] RAX: 0000000000000720 RBX: 1ffff110131d8f13 RCX: 0000000000000001 [ 46.656706] RDX: 1ffff110100fbe51 RSI: 1ffff110100fbe67 RDI: 000000010000000e [ 46.656710] RBP: ffff888098ec7960 R08: ffff8880807df28c R09: 0000000000000002 [ 46.656714] R10: 0000000000000000 R11: ffff8880a950c300 R12: ffff8880807deec0 [ 46.656717] R13: 0000000000000001 R14: 000000010000000e R15: 0000000000000002 [ 46.656722] FS: 0000000000e53880(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 [ 46.656726] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.656730] CR2: 000000010000000e CR3: 00000000a4870000 CR4: 00000000001406e0 [ 46.656737] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.656740] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.656742] Call Trace: [ 46.656750] ? reset_palette+0x180/0x180 [ 46.656760] ? __atomic_notifier_call_chain+0xc2/0x150 [ 46.656768] do_con_write.part.0+0xcc7/0x1b50 [ 46.656777] ? mark_held_locks+0xb1/0x100 [ 46.656786] ? retint_kernel+0x2d/0x2d [ 46.656796] ? do_con_trol+0x5b40/0x5b40 [ 46.656806] con_write+0x38/0xc0 [ 46.656814] n_tty_write+0x38b/0xee0 [ 46.656826] ? process_echoes+0x150/0x150 [ 46.656833] ? do_wait_intr_irq+0x2a0/0x2a0 [ 46.656841] ? kasan_check_write+0x14/0x20 [ 46.656848] ? _copy_from_user+0x99/0x110 [ 46.656855] tty_write+0x3f6/0x700 [ 46.656863] ? process_echoes+0x150/0x150 [ 46.656877] __vfs_write+0x105/0x6b0 [ 46.656884] ? tty_read+0x270/0x270 [ 46.656890] ? kernel_read+0x120/0x120 [ 46.656898] ? __inode_security_revalidate+0xd6/0x130 [ 46.656903] ? avc_policy_seqno+0x9/0x20 [ 46.656909] ? selinux_file_permission+0x85/0x480 [ 46.656919] ? security_file_permission+0x89/0x1f0 [ 46.656926] ? rw_verify_area+0xea/0x2b0 [ 46.656932] ? putname+0xe0/0x120 [ 46.656941] vfs_write+0x198/0x500 [ 46.656949] SyS_write+0xfd/0x230 [ 46.656955] ? SyS_read+0x230/0x230 [ 46.656963] ? do_syscall_64+0x53/0x640 [ 46.656969] ? SyS_read+0x230/0x230 [ 46.656976] do_syscall_64+0x1e8/0x640 [ 46.656983] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.656992] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 46.656997] RIP: 0033:0x4404f9 [ 46.657000] RSP: 002b:00007ffed2974698 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 46.657006] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9 [ 46.657009] RDX: 0000000000000078 RSI: 0000000020000200 RDI: 0000000000000004 [ 46.657013] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 46.657016] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0 [ 46.657020] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 46.657027] Code: c1 e0 2a 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 2c 01 0f 8e e4 29 00 00 41 0f b7 84 24 c8 03 00 00 44 89 f9 4c 89 f7 d1 e9 66 ab 49 8d bc 24 78 04 00 00 b8 ff ff 37 00 48 89 fa 48 c1 [ 46.657138] RIP: do_con_trol+0x2fac/0x5b40 RSP: ffff888098ec7878 [ 46.657140] CR2: 000000010000000e [ 46.657147] ---[ end trace 9ed48a5e027adfcd ]--- [ 46.657150] Kernel panic - not syncing: Fatal exception [ 46.657829] Kernel Offset: disabled [ 47.007499] Rebooting in 86400 seconds..