[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   14.811599] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   19.575855] random: sshd: uninitialized urandom read (32 bytes read)
[   19.821737] random: sshd: uninitialized urandom read (32 bytes read)
[   20.487142] random: sshd: uninitialized urandom read (32 bytes read)
[   33.939658] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.60' (ECDSA) to the list of known hosts.
[   39.418977] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   39.504531] ==================================================================
[   39.511935] BUG: KASAN: use-after-free in _copy_to_user+0xe9/0x110
[   39.518239] Read of size 985 at addr ffff8801a5fffff2 by task syz-executor650/4461
[   39.525926] 
[   39.527531] CPU: 0 PID: 4461 Comm: syz-executor650 Not tainted 4.18.0-rc3+ #48
[   39.534864] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.544189] Call Trace:
[   39.546777]  dump_stack+0x1c9/0x2b4
[   39.550401]  ? dump_stack_print_info.cold.2+0x52/0x52
[   39.555568]  ? printk+0xa7/0xcf
[   39.558823]  ? kmsg_dump_rewind_nolock+0xe4/0xe4
[   39.563553]  ? _copy_to_user+0xe9/0x110
[   39.567513]  print_address_description+0x6c/0x20b
[   39.572336]  ? _copy_to_user+0xe9/0x110
[   39.576284]  kasan_report.cold.7+0x242/0x2fe
[   39.580672]  check_memory_region+0x13e/0x1b0
[   39.585059]  kasan_check_read+0x11/0x20
[   39.589008]  _copy_to_user+0xe9/0x110
[   39.592794]  bpf_test_finish.isra.7+0xee/0x1f0
[   39.597357]  ? bpf_test_init.isra.8+0x100/0x100
[   39.602001]  ? bpf_test_run+0x2fc/0x3b0
[   39.605952]  bpf_prog_test_run_skb+0x7d7/0xa30
[   39.610512]  ? bpf_test_finish.isra.7+0x1f0/0x1f0
[   39.615334]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   39.620856]  ? __bpf_prog_get+0x9b/0x290
[   39.624891]  ? bpf_test_finish.isra.7+0x1f0/0x1f0
[   39.629707]  bpf_prog_test_run+0x130/0x1a0
[   39.633928]  __x64_sys_bpf+0x3d8/0x510
[   39.637791]  ? bpf_prog_get+0x20/0x20
[   39.641582]  ? do_page_fault+0xf6/0x8c0
[   39.645535]  do_syscall_64+0x1b9/0x820
[   39.649413]  ? syscall_return_slowpath+0x5e0/0x5e0
[   39.654323]  ? syscall_return_slowpath+0x31d/0x5e0
[   39.659228]  ? prepare_exit_to_usermode+0x3b0/0x3b0
[   39.664220]  ? prepare_exit_to_usermode+0x291/0x3b0
[   39.669211]  ? perf_trace_sys_enter+0xb10/0xb10
[   39.673868]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   39.678688]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   39.683853] RIP: 0033:0x4402f9
[   39.687016] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
[   39.706140] RSP: 002b:00007ffc87505f78 EFLAGS: 00000213 ORIG_RAX: 0000000000000141
[   39.713831] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402f9
[   39.721089] RDX: 0000000000000028 RSI: 0000000020000180 RDI: 000000000000000a
[   39.728340] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
[   39.735677] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401b80
[   39.742925] R13: 0000000000401c10 R14: 0000000000000000 R15: 0000000000000000
[   39.750179] 
[   39.751781] The buggy address belongs to the page:
[   39.756686] page:ffffea000697ffc0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
[   39.764812] flags: 0x2fffc0000000000()
[   39.768689] raw: 02fffc0000000000 ffffea000697ffc8 ffffea000697ffc8 0000000000000000
[   39.776549] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[   39.784402] page dumped because: kasan: bad access detected
[   39.790082] 
[   39.791684] Memory state around the buggy address:
[   39.796586]  ffff8801a5fffe80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   39.803928]  ffff8801a5ffff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   39.811264] >ffff8801a5ffff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   39.818594]                                                              ^
[   39.825579]  ffff8801a6000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   39.832915]  ffff8801a6000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   39.840249] ==================================================================
[   39.847685] Kernel panic - not syncing: panic_on_warn set ...
[   39.847685] 
[   39.855040] CPU: 0 PID: 4461 Comm: syz-executor650 Tainted: G    B             4.18.0-rc3+ #48
[   39.863764] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.873091] Call Trace:
[   39.875664]  dump_stack+0x1c9/0x2b4
[   39.879272]  ? dump_stack_print_info.cold.2+0x52/0x52
[   39.884449]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[   39.889187]  panic+0x238/0x4e7
[   39.892452]  ? add_taint.cold.5+0x16/0x16
[   39.896578]  ? do_raw_spin_unlock+0xa7/0x2f0
[   39.900962]  ? do_raw_spin_unlock+0xa7/0x2f0
[   39.905348]  ? _copy_to_user+0xe9/0x110
[   39.909298]  kasan_end_report+0x47/0x4f
[   39.913251]  kasan_report.cold.7+0x76/0x2fe
[   39.917560]  check_memory_region+0x13e/0x1b0
[   39.921946]  kasan_check_read+0x11/0x20
[   39.925894]  _copy_to_user+0xe9/0x110
[   39.929672]  bpf_test_finish.isra.7+0xee/0x1f0
[   39.934229]  ? bpf_test_init.isra.8+0x100/0x100
[   39.938877]  ? bpf_test_run+0x2fc/0x3b0
[   39.943100]  bpf_prog_test_run_skb+0x7d7/0xa30
[   39.947661]  ? bpf_test_finish.isra.7+0x1f0/0x1f0
[   39.952484]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   39.958515]  ? __bpf_prog_get+0x9b/0x290
[   39.962565]  ? bpf_test_finish.isra.7+0x1f0/0x1f0
[   39.967382]  bpf_prog_test_run+0x130/0x1a0
[   39.971593]  __x64_sys_bpf+0x3d8/0x510
[   39.975455]  ? bpf_prog_get+0x20/0x20
[   39.979234]  ? do_page_fault+0xf6/0x8c0
[   39.983188]  do_syscall_64+0x1b9/0x820
[   39.987073]  ? syscall_return_slowpath+0x5e0/0x5e0
[   39.991978]  ? syscall_return_slowpath+0x31d/0x5e0
[   39.996883]  ? prepare_exit_to_usermode+0x3b0/0x3b0
[   40.002137]  ? prepare_exit_to_usermode+0x291/0x3b0
[   40.007142]  ? perf_trace_sys_enter+0xb10/0xb10
[   40.011790]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   40.016612]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   40.021786] RIP: 0033:0x4402f9
[   40.024950] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
[   40.044072] RSP: 002b:00007ffc87505f78 EFLAGS: 00000213 ORIG_RAX: 0000000000000141
[   40.051765] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402f9
[   40.059024] RDX: 0000000000000028 RSI: 0000000020000180 RDI: 000000000000000a
[   40.066270] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
[   40.073522] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401b80
[   40.080776] R13: 0000000000401c10 R14: 0000000000000000 R15: 0000000000000000
[   40.088732] Dumping ftrace buffer:
[   40.092246]    (ftrace buffer empty)
[   40.095932] Kernel Offset: disabled
[   40.099536] Rebooting in 86400 seconds..