[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.321698] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.407465] random: sshd: uninitialized urandom read (32 bytes read) [ 15.813841] random: sshd: uninitialized urandom read (32 bytes read) [ 16.666648] random: sshd: uninitialized urandom read (32 bytes read) [ 16.800947] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts. [ 22.227084] random: sshd: uninitialized urandom read (32 bytes read) 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 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 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 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 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 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 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 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 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 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 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 [ 22.319469] ================================================================== [ 22.326847] BUG: KASAN: slab-out-of-bounds in strlen+0x91/0xa0 [ 22.332789] Read of size 1 at addr ffff8801b5f9a020 by task syz-executor267/3797 [ 22.340288] [ 22.341888] CPU: 1 PID: 3797 Comm: syz-executor267 Not tainted 4.9.105-gd7e64f8 #40 [ 22.349656] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.358987] ffff8801b5d1f978 ffffffff81eb41a9 ffffea0006d7e680 ffff8801b5f9a020 [ 22.366954] 0000000000000000 ffff8801b5f9a020 ffff8801b5f9a018 ffff8801b5d1f9b0 [ 22.374921] ffffffff81567e49 ffff8801b5f9a020 0000000000000001 0000000000000000 [ 22.382908] Call Trace: [ 22.387768] [] dump_stack+0xc1/0x128 [ 22.393110] [] print_address_description+0x6c/0x234 [ 22.399746] [] kasan_report.cold.6+0x242/0x2fe [ 22.405946] [] ? strlen+0x91/0xa0 [ 22.411021] [] __asan_report_load1_noabort+0x14/0x20 [ 22.417743] [] strlen+0x91/0xa0 [ 22.422642] [] getname_kernel+0x24/0x340 [ 22.428322] [] kern_path_mountpoint+0x24/0x70 [ 22.434437] [] ? autofs_dev_ioctl_protosubver+0x80/0x80 [ 22.441417] [] find_autofs_mount.isra.4+0x8e/0x200 [ 22.447968] [] ? autofs_dev_ioctl_compat+0x30/0x30 [ 22.454514] [] autofs_dev_ioctl_openmount+0x153/0x2d0 [ 22.461321] [] ? autofs_dev_ioctl_requester+0x530/0x530 [ 22.468303] [] ? check_stack_object+0x110/0x150 [ 22.474591] [] ? __check_object_size+0x248/0x38e [ 22.480966] [] ? autofs_dev_ioctl_requester+0x530/0x530 [ 22.487947] [] _autofs_dev_ioctl+0x4fb/0x690 [ 22.493982] [] ? autofs_dev_ioctl_closemount+0x50/0x50 [ 22.500879] [] ? _autofs_dev_ioctl+0x690/0x690 [ 22.507077] [] autofs_dev_ioctl+0x1b/0x30 [ 22.512846] [] do_vfs_ioctl+0x1ac/0x11a0 [ 22.518536] [] ? ioctl_preallocate+0x220/0x220 [ 22.524737] [] ? kmem_cache_free+0x294/0x310 [ 22.530763] [] ? selinux_capable+0x40/0x40 [ 22.536626] [] ? putname+0xe0/0x110 [ 22.541876] [] ? do_sys_open+0x224/0x5c0 [ 22.547563] [] ? filp_open+0x70/0x70 [ 22.552901] [] ? security_file_ioctl+0x8f/0xc0 [ 22.559103] [] SyS_ioctl+0x8f/0xc0 [ 22.564262] [] ? do_vfs_ioctl+0x11a0/0x11a0 [ 22.570212] [] do_syscall_64+0x1a6/0x490 [ 22.575900] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.582793] [ 22.584391] Allocated by task 3797: [ 22.587990] save_stack_trace+0x16/0x20 [ 22.591947] save_stack+0x43/0xd0 [ 22.595369] kasan_kmalloc+0xc7/0xe0 [ 22.599050] kasan_slab_alloc+0x12/0x20 [ 22.602994] __kmalloc_track_caller+0xdc/0x2b0 [ 22.607546] memdup_user+0x2c/0xb0 [ 22.611070] _autofs_dev_ioctl+0x13a/0x690 [ 22.615272] autofs_dev_ioctl+0x1b/0x30 [ 22.619215] do_vfs_ioctl+0x1ac/0x11a0 [ 22.623078] SyS_ioctl+0x8f/0xc0 [ 22.626417] do_syscall_64+0x1a6/0x490 [ 22.630274] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.635341] [ 22.636939] Freed by task 0: [ 22.639923] (stack is not available) [ 22.643602] [ 22.645202] The buggy address belongs to the object at ffff8801b5f9a000 [ 22.645202] which belongs to the cache kmalloc-32 of size 32 [ 22.657662] The buggy address is located 0 bytes to the right of [ 22.657662] 32-byte region [ffff8801b5f9a000, ffff8801b5f9a020) [ 22.669763] The buggy address belongs to the page: [ 22.674660] page:ffffea0006d7e680 count:1 mapcount:0 mapping: (null) index:0x0 [ 22.682897] flags: 0x8000000000000080(slab) [ 22.687184] page dumped because: kasan: bad access detected [ 22.692860] [ 22.694458] Memory state around the buggy address: [ 22.699370] ffff8801b5f99f00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 22.707218] ffff8801b5f99f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.714554] >ffff8801b5f9a000: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc [ 22.721899] ^ [ 22.726274] ffff8801b5f9a080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.733599] ffff8801b5f9a100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.740923] ================================================================== [ 22.748334] Disabling lock debugging due to kernel taint [ 22.754050] Kernel panic - not syncing: panic_on_warn set ... [ 22.754050] [ 22.761402] CPU: 1 PID: 3797 Comm: syz-executor267 Tainted: G B 4.9.105-gd7e64f8 #40 [ 22.770380] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.779708] ffff8801b5d1f8d8 ffffffff81eb41a9 ffffffff843c625d 00000000ffffffff [ 22.787711] 0000000000000000 0000000000000001 ffff8801b5f9a018 ffff8801b5d1f998 [ 22.795698] ffffffff81421e15 0000000041b58ab3 ffffffff843b9990 ffffffff81421c56 [ 22.803670] Call Trace: [ 22.806229] [] dump_stack+0xc1/0x128 [ 22.811565] [] panic+0x1bf/0x3bc [ 22.816551] [] ? add_taint.cold.6+0x16/0x16 [ 22.822491] [] ? ___preempt_schedule+0x16/0x18 [ 22.828695] [] kasan_end_report+0x47/0x4f [ 22.834462] [] kasan_report.cold.6+0x76/0x2fe [ 22.840575] [] ? strlen+0x91/0xa0 [ 22.845650] [] __asan_report_load1_noabort+0x14/0x20 [ 22.852374] [] strlen+0x91/0xa0 [ 22.857282] [] getname_kernel+0x24/0x340 [ 22.862971] [] kern_path_mountpoint+0x24/0x70 [ 22.869088] [] ? autofs_dev_ioctl_protosubver+0x80/0x80 [ 22.876070] [] find_autofs_mount.isra.4+0x8e/0x200 [ 22.882617] [] ? autofs_dev_ioctl_compat+0x30/0x30 [ 22.889164] [] autofs_dev_ioctl_openmount+0x153/0x2d0 [ 22.895974] [] ? autofs_dev_ioctl_requester+0x530/0x530 [ 22.902958] [] ? check_stack_object+0x110/0x150 [ 22.909253] [] ? __check_object_size+0x248/0x38e [ 22.915628] [] ? autofs_dev_ioctl_requester+0x530/0x530 [ 22.922611] [] _autofs_dev_ioctl+0x4fb/0x690 [ 22.928647] [] ? autofs_dev_ioctl_closemount+0x50/0x50 [ 22.935543] [] ? _autofs_dev_ioctl+0x690/0x690 [ 22.941747] [] autofs_dev_ioctl+0x1b/0x30 [ 22.947514] [] do_vfs_ioctl+0x1ac/0x11a0 [ 22.953195] [] ? ioctl_preallocate+0x220/0x220 [ 22.959399] [] ? kmem_cache_free+0x294/0x310 [ 22.965430] [] ? selinux_capable+0x40/0x40 [ 22.971287] [] ? putname+0xe0/0x110 [ 22.976534] [] ? do_sys_open+0x224/0x5c0 [ 22.982221] [] ? filp_open+0x70/0x70 [ 22.987553] [] ? security_file_ioctl+0x8f/0xc0 [ 22.993763] [] SyS_ioctl+0x8f/0xc0 [ 22.998920] [] ? do_vfs_ioctl+0x11a0/0x11a0 [ 23.004862] [] do_syscall_64+0x1a6/0x490 [ 23.010543] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 23.017871] Dumping ftrace buffer: [ 23.021382] (ftrace buffer empty) [ 23.025061] Kernel Offset: disabled [ 23.028657] Rebooting in 86400 seconds..