[ 15.815203] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.200561] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.705651] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.580432] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) [ 22.762901] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) Warning: Permanently added '10.128.15.192' (ECDSA) to the list of known hosts. [ 28.151053] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) executing program [ 28.255296] ================================================================== [ 28.262699] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.269691] Read of size 8 at addr ffff8800b79f1140 by task syzkaller107646/3314 [ 28.277224] [ 28.278829] CPU: 1 PID: 3314 Comm: syzkaller107646 Not tainted 4.4.112-g5f6325b #28 [ 28.286591] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.295922] 0000000000000000 e953a3dcf93a4edf ffff8801d04d79f0 ffffffff81d0579d [ 28.303918] ffffea0002de7c40 ffff8800b79f1140 0000000000000000 ffff8800b79f1140 [ 28.311907] ffff8800b4230238 ffff8801d04d7a28 ffffffff814fd9f3 ffff8800b79f1140 [ 28.319880] Call Trace: [ 28.322461] [] dump_stack+0xc1/0x124 [ 28.327807] [] print_address_description+0x73/0x260 [ 28.334447] [] kasan_report+0x285/0x370 [ 28.340054] [] ? sg_remove_request+0xf9/0x110 [ 28.346185] [] __asan_report_load8_noabort+0x14/0x20 [ 28.352927] [] sg_remove_request+0xf9/0x110 [ 28.358870] [] sg_finish_rem_req+0x295/0x340 [ 28.364900] [] sg_read+0xa21/0x1490 [ 28.370161] [] ? __check_object_size+0x154/0x35b [ 28.376540] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.383183] [] ? fsnotify+0xee0/0xee0 [ 28.388617] [] ? avc_policy_seqno+0x9/0x20 [ 28.394474] [] do_loop_readv_writev+0x141/0x1e0 [ 28.400770] [] ? security_file_permission+0x89/0x1e0 [ 28.407502] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.414144] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.420789] [] do_readv_writev+0x5dd/0x6e0 [ 28.426653] [] ? vfs_write+0x530/0x530 [ 28.432163] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.438112] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.445111] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.451234] [] ? sg_fasync+0x8d/0xb0 [ 28.456591] [] vfs_readv+0x78/0xb0 [ 28.461754] [] SyS_readv+0xd9/0x240 [ 28.467004] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.473558] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.480111] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.486658] [ 28.488259] Allocated by task 0: [ 28.491590] (stack is not available) [ 28.495268] [ 28.496866] Freed by task 0: [ 28.499850] (stack is not available) [ 28.503530] [ 28.505129] The buggy address belongs to the object at ffff8800b79f1100 [ 28.505129] which belongs to the cache fasync_cache of size 96 [ 28.517760] The buggy address is located 64 bytes inside of [ 28.517760] 96-byte region [ffff8800b79f1100, ffff8800b79f1160) [ 28.529429] The buggy address belongs to the page: [ 29.113092] kernel tried to execute NX-protected page - exploit attempt? (uid: 0) [ 29.120779] BUG: unable to handle kernel paging request at ffffea0002de7c40 [ 29.128165] IP: [] 0xffffea0002de7c40 [ 29.133675] PGD 21f7fa067 PUD 21f7f9067 PMD 800000021aa000e3 [ 29.139959] Oops: 0011 [#1] PREEMPT SMP KASAN [ 29.144987] Dumping ftrace buffer: [ 29.148524] (ftrace buffer empty) [ 29.152237] Modules linked in: [ 29.155566] CPU: 0 PID: 1734 Comm: udevd Not tainted 4.4.112-g5f6325b #28 [ 29.162494] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.171859] task: ffff8801d3a917c0 task.stack: ffff8801d3b18000 [ 29.177913] RIP: 0010:[] [] 0xffffea0002de7c40 [ 29.185862] RSP: 0018:ffff8801d3b1f900 EFLAGS: 00010293 [ 29.191312] RAX: ffffea0002de7c40 RBX: ffff8801cfcc36b0 RCX: ffffffff8153bf65 [ 29.198586] RDX: 0000000000000001 RSI: ffff8801cfcc36b0 RDI: ffff8801da27f820 [ 29.205866] RBP: ffff8801d3b1f938 R08: 0000000000000001 R09: 0000000000000001 [ 29.213151] R10: 0000000000000000 R11: 1ffff1003a763ec2 R12: ffff8801da27f820 [ 29.220429] R13: 0000000000000001 R14: ffff8801cfcc36b2 R15: ffff8801cfcc3710 [ 29.227702] FS: 00007f165a2457a0(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.235931] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.241818] CR2: ffffea0002de7c40 CR3: 00000001d3b20000 CR4: 0000000000160670 [ 29.249098] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.256377] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.263649] Stack: [ 29.265803] ffffffff8153bf74 ffffea0002de7c40 0000000000000001 ffff8801cfcc36b0 [ 29.273895] ffff8801da27f820 ffff8801d3b1fd40 ffff8800b4103329 ffff8801d3b1f968 [ 29.281968] ffffffff8153c0af ffff8801da27f820 0000000000000000 ffff8801cfcc36b0 [ 29.290044] Call Trace: [ 29.292639] [] ? __inode_permission2+0x164/0x240 [ 29.299056] [] inode_permission2+0x2f/0x100 [ 29.305045] [] link_path_walk+0x8a8/0x16e0 [ 29.310945] [] ? walk_component+0xff0/0xff0 [ 29.316935] [] ? __mutex_init+0xca/0x100 [ 29.322661] [] path_openat+0x22d/0x3b60 [ 29.328309] [] ? path_mountpoint+0x830/0x830 [ 29.334382] [] ? getname_flags+0xcb/0x580 [ 29.340196] [] ? getname+0x19/0x20 [ 29.345405] [] ? do_sys_open+0x205/0x4b0 [ 29.351135] [] ? SyS_open+0x2d/0x40 [ 29.356427] [] ? entry_SYSCALL_64_fastpath+0x16/0x92 [ 29.363195] [] ? __mutex_unlock_slowpath+0x208/0x3b0 [ 29.369964] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 29.376998] [] ? __lock_is_held+0xa1/0xf0 [ 29.382818] [] do_filp_open+0x197/0x290 [ 29.388466] [] ? user_path_mountpoint_at+0x40/0x40 [ 29.395063] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.401053] [] ? __alloc_fd+0x1e3/0x500 [ 29.406697] [] do_sys_open+0x343/0x4b0 [ 29.412255] [] ? filp_open+0x70/0x70 [ 29.417634] [] ? SyS_read+0x1b0/0x1b0 [ 29.423106] [] SyS_open+0x2d/0x40 [ 29.428224] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 29.434807] Code: 00 00 00 ff ff ff ff 00 00 00 00 e0 7f dd 02 00 ea ff ff e0 35 d5 02 00 ea ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <80> 00 00 00 00 00 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 29.462441] RIP [] 0xffffea0002de7c40 [ 29.468026] RSP [ 29.471646] CR2: ffffea0002de7c40 [ 29.475105] ---[ end trace af6d1c17598444d5 ]--- [ 29.479861] Kernel panic - not syncing: Fatal exception [ 30.248052] PANIC: double fault, error_code: 0x0 [ 30.252867] CPU: 1 PID: 3314 Comm: syzkaller107646 Tainted: G D 4.4.112-g5f6325b #28 [ 30.261853] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.271184] task: ffff8801d1fd4740 task.stack: ffff8801d04d0000 [ 30.277215] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 30.285985] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 30.291408] RAX: ffff8801d1fd4740 RBX: ffffea0002de7c40 RCX: ffffffff8148ff40 [ 30.298655] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea0002de7c40 [ 30.305901] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 30.313151] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 30.320403] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 30.327654] FS: 00000000012a8880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.335856] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.341714] CR2: ffff8800fffffff8 CR3: 00000000b75f0000 CR4: 0000000000160670 [ 30.348960] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.356209] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.363453] Stack: [ 30.365577] [ 30.367179] Call Trace: [ 30.369734] [ 30.371775] Code: 00 e9 83 fd ff ff e8 a8 e2 06 00 e9 50 fd ff ff e8 9e e2 06 00 e9 1d fd ff ff 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 <41> 55 49 89 f5 41 54 49 89 d4 53 48 89 fb 48 83 ec 08 e8 11 01 [ 30.610436] Shutting down cpus with NMI [ 30.614865] Dumping ftrace buffer: [ 30.618377] (ftrace buffer empty) [ 30.622058] Kernel Offset: disabled [ 30.625656] Rebooting in 86400 seconds..