[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 33.689976] random: sshd: uninitialized urandom read (32 bytes read) [ 34.026796] kauditd_printk_skb: 10 callbacks suppressed [ 34.026804] audit: type=1400 audit(1575758969.948:35): avc: denied { map } for pid=7023 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 [ 34.125754] random: sshd: uninitialized urandom read (32 bytes read) [ 34.707485] random: sshd: uninitialized urandom read (32 bytes read) [ 34.930115] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. [ 40.643229] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 40.761966] audit: type=1400 audit(1575758976.688:36): avc: denied { map } for pid=7036 comm="syz-executor540" path="/root/syz-executor540613663" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 40.792982] ================================================================== [ 40.793002] BUG: KASAN: global-out-of-bounds in fb_pad_aligned_buffer+0x102/0x120 [ 40.793006] Read of size 1 at addr ffffffff87064ff6 by task syz-executor540/7036 [ 40.793008] [ 40.793014] CPU: 1 PID: 7036 Comm: syz-executor540 Not tainted 4.14.158-syzkaller #0 [ 40.793018] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.793020] Call Trace: [ 40.793026] dump_stack+0x142/0x197 [ 40.793032] ? fb_pad_aligned_buffer+0x102/0x120 [ 40.793039] print_address_description.cold+0x5/0x1dc [ 40.793044] ? fb_pad_aligned_buffer+0x102/0x120 [ 40.793048] kasan_report.cold+0xa9/0x2af [ 40.793054] __asan_report_load1_noabort+0x14/0x20 [ 40.793058] fb_pad_aligned_buffer+0x102/0x120 [ 40.793067] bit_putcs+0xbc4/0xdb0 [ 40.793072] ? memcpy+0x46/0x50 [ 40.793082] ? update_attr.isra.0+0x160/0x160 [ 40.793090] ? update_attr.isra.0+0x160/0x160 [ 40.793094] ? fb_get_color_depth+0x5f/0x70 [ 40.793100] ? update_attr.isra.0+0x160/0x160 [ 40.793104] fbcon_putcs+0x3c2/0x480 [ 40.793113] do_update_region+0x3b3/0x650 [ 40.793121] ? con_get_trans_old+0x230/0x230 [ 40.793125] ? fbcon_set_palette+0x203/0x5b0 [ 40.793129] ? fbcon_redraw.isra.0+0x440/0x440 [ 40.793136] redraw_screen+0x589/0x7c0 [ 40.793143] ? con_flush_chars+0x90/0x90 [ 40.793150] fbcon_do_set_font+0x6d1/0x9a0 [ 40.793158] fbcon_copy_font+0x12c/0x190 [ 40.793162] ? fbcon_do_set_font+0x9a0/0x9a0 [ 40.793167] con_font_op+0x5c6/0x1060 [ 40.793173] ? con_write+0xc0/0xc0 [ 40.793180] ? kasan_check_write+0x14/0x20 [ 40.793186] ? _copy_from_user+0x99/0x110 [ 40.793191] vt_ioctl+0x179f/0x2170 [ 40.793197] ? avc_has_extended_perms+0x8ec/0xe40 [ 40.793202] ? complete_change_console+0x360/0x360 [ 40.793207] ? avc_ss_reset+0x110/0x110 [ 40.793211] ? kasan_slab_free+0x75/0xc0 [ 40.793218] ? SyS_open+0x2d/0x40 [ 40.793224] ? do_syscall_64+0x1e8/0x640 [ 40.793228] ? entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 40.793234] ? debug_check_no_obj_freed+0x2aa/0x7b7 [ 40.793238] ? tty_jobctrl_ioctl+0x44/0xc10 [ 40.793242] ? complete_change_console+0x360/0x360 [ 40.793248] tty_ioctl+0x841/0x1320 [ 40.793254] ? tty_vhangup+0x30/0x30 [ 40.793263] ? __might_sleep+0x93/0xb0 [ 40.793273] ? tty_vhangup+0x30/0x30 [ 40.793279] do_vfs_ioctl+0x7ae/0x1060 [ 40.793292] ? selinux_file_mprotect+0x5d0/0x5d0 [ 40.793298] ? ioctl_preallocate+0x1c0/0x1c0 [ 40.793302] ? putname+0xe0/0x120 [ 40.793308] ? do_sys_open+0x221/0x430 [ 40.793315] ? security_file_ioctl+0x7d/0xb0 [ 40.793319] ? security_file_ioctl+0x89/0xb0 [ 40.793325] SyS_ioctl+0x8f/0xc0 [ 40.793329] ? do_vfs_ioctl+0x1060/0x1060 [ 40.793335] do_syscall_64+0x1e8/0x640 [ 40.793339] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.793346] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 40.793351] RIP: 0033:0x440269 [ 40.793354] RSP: 002b:00007ffc87e75d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 40.793359] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440269 [ 40.793362] RDX: 0000000020000000 RSI: 0000000000004b72 RDI: 0000000000000004 [ 40.793365] RBP: 00000000006cb018 R08: 000000000000000d R09: 00000000004002c8 [ 40.793368] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b50 [ 40.793375] R13: 0000000000401be0 R14: 0000000000000000 R15: 0000000000000000 [ 40.793383] [ 40.793384] The buggy address belongs to the variable: [ 40.793390] oid_index+0x76/0x9a0 [ 40.793391] [ 40.793393] Memory state around the buggy address: [ 40.793398] ffffffff87064e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 40.793401] ffffffff87064f00: 00 00 00 00 00 00 00 00 00 00 00 05 fa fa fa fa [ 40.793404] >ffffffff87064f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 06 fa [ 40.793407] ^ [ 40.793410] ffffffff87065000: fa fa fa fa 00 02 fa fa fa fa fa fa 00 01 fa fa [ 40.793413] ffffffff87065080: fa fa fa fa 00 00 02 fa fa fa fa fa 00 03 fa fa [ 40.793415] ================================================================== [ 40.793417] Disabling lock debugging due to kernel taint [ 40.793419] Kernel panic - not syncing: panic_on_warn set ... [ 40.793419] [ 40.793424] CPU: 1 PID: 7036 Comm: syz-executor540 Tainted: G B 4.14.158-syzkaller #0 [ 40.793426] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.793427] Call Trace: [ 40.793434] dump_stack+0x142/0x197 [ 40.793439] ? fb_pad_aligned_buffer+0x102/0x120 [ 40.793443] panic+0x1f9/0x42d [ 40.793447] ? add_taint.cold+0x16/0x16 [ 40.793453] ? lock_downgrade+0x740/0x740 [ 40.793462] kasan_end_report+0x47/0x4f [ 40.793466] kasan_report.cold+0x130/0x2af [ 40.793471] __asan_report_load1_noabort+0x14/0x20 [ 40.793475] fb_pad_aligned_buffer+0x102/0x120 [ 40.793483] bit_putcs+0xbc4/0xdb0 [ 40.793487] ? memcpy+0x46/0x50 [ 40.793494] ? update_attr.isra.0+0x160/0x160 [ 40.793499] ? update_attr.isra.0+0x160/0x160 [ 40.793503] ? fb_get_color_depth+0x5f/0x70 [ 40.793507] ? update_attr.isra.0+0x160/0x160 [ 40.793511] fbcon_putcs+0x3c2/0x480 [ 40.793516] do_update_region+0x3b3/0x650 [ 40.793526] ? con_get_trans_old+0x230/0x230 [ 40.793530] ? fbcon_set_palette+0x203/0x5b0 [ 40.793534] ? fbcon_redraw.isra.0+0x440/0x440 [ 40.793539] redraw_screen+0x589/0x7c0 [ 40.793547] ? con_flush_chars+0x90/0x90 [ 40.793553] fbcon_do_set_font+0x6d1/0x9a0 [ 40.793558] fbcon_copy_font+0x12c/0x190 [ 40.793562] ? fbcon_do_set_font+0x9a0/0x9a0 [ 40.793566] con_font_op+0x5c6/0x1060 [ 40.793570] ? con_write+0xc0/0xc0 [ 40.793575] ? kasan_check_write+0x14/0x20 [ 40.793579] ? _copy_from_user+0x99/0x110 [ 40.793583] vt_ioctl+0x179f/0x2170 [ 40.793587] ? avc_has_extended_perms+0x8ec/0xe40 [ 40.793591] ? complete_change_console+0x360/0x360 [ 40.793595] ? avc_ss_reset+0x110/0x110 [ 40.793598] ? kasan_slab_free+0x75/0xc0 [ 40.793602] ? SyS_open+0x2d/0x40 [ 40.793606] ? do_syscall_64+0x1e8/0x640 [ 40.793613] ? entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 40.793617] ? debug_check_no_obj_freed+0x2aa/0x7b7 [ 40.793621] ? tty_jobctrl_ioctl+0x44/0xc10 [ 40.793624] ? complete_change_console+0x360/0x360 [ 40.793629] tty_ioctl+0x841/0x1320 [ 40.793633] ? tty_vhangup+0x30/0x30 [ 40.793639] ? __might_sleep+0x93/0xb0 [ 40.793644] ? tty_vhangup+0x30/0x30 [ 40.793648] do_vfs_ioctl+0x7ae/0x1060 [ 40.793652] ? selinux_file_mprotect+0x5d0/0x5d0 [ 40.793657] ? ioctl_preallocate+0x1c0/0x1c0 [ 40.793660] ? putname+0xe0/0x120 [ 40.793665] ? do_sys_open+0x221/0x430 [ 40.793670] ? security_file_ioctl+0x7d/0xb0 [ 40.793673] ? security_file_ioctl+0x89/0xb0 [ 40.793678] SyS_ioctl+0x8f/0xc0 [ 40.793682] ? do_vfs_ioctl+0x1060/0x1060 [ 40.793686] do_syscall_64+0x1e8/0x640 [ 40.793689] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.793695] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 40.793698] RIP: 0033:0x440269 [ 40.793700] RSP: 002b:00007ffc87e75d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 40.793704] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440269 [ 40.793706] RDX: 0000000020000000 RSI: 0000000000004b72 RDI: 0000000000000004 [ 40.793708] RBP: 00000000006cb018 R08: 000000000000000d R09: 00000000004002c8 [ 40.793710] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b50 [ 40.793712] R13: 0000000000401be0 R14: 0000000000000000 R15: 0000000000000000 [ 40.795245] Kernel Offset: disabled [ 41.499920] Rebooting in 86400 seconds..