[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.89' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.932866] audit: type=1400 audit(1601776257.602:8): avc: denied { execmem } for pid=6511 comm="syz-executor967" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 39.938964] erofs: read_super, device -> /dev/loop0 [ 39.959865] erofs: options -> [ 39.966607] ================================================================================ [ 39.975303] UBSAN: Undefined behaviour in drivers/staging/erofs/super.c:122:3 [ 39.982569] shift exponent 55 is too large for 32-bit type 'int' [ 39.988698] CPU: 1 PID: 6511 Comm: syz-executor967 Not tainted 4.19.149-syzkaller #0 [ 39.996642] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.006060] Call Trace: [ 40.008631] dump_stack+0x22c/0x33e [ 40.012243] ubsan_epilogue+0xe/0x3a [ 40.015957] __ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 [ 40.022096] ? __bread_gfp+0x81/0x300 [ 40.025881] erofs_fill_super+0x397/0x12fc [ 40.030185] ? trace_event_raw_event_erofs_fill_inode.cold+0x68/0x68 [ 40.036693] ? vsprintf+0x30/0x30 [ 40.040136] ? __mutex_add_waiter+0x160/0x160 [ 40.044650] ? set_blocksize+0x163/0x3f0 [ 40.048712] mount_bdev+0x2fc/0x3b0 [ 40.052334] ? trace_event_raw_event_erofs_fill_inode.cold+0x68/0x68 [ 40.058813] erofs_mount+0x8c/0xc0 [ 40.062338] ? erofs_kill_sb+0x20/0x20 [ 40.066214] mount_fs+0xa3/0x318 [ 40.069565] vfs_kern_mount.part.0+0x68/0x470 [ 40.074057] do_mount+0x51c/0x2f10 [ 40.077602] ? do_raw_spin_unlock+0x171/0x240 [ 40.082080] ? check_preemption_disabled+0x41/0x2b0 [ 40.087098] ? copy_mount_string+0x40/0x40 [ 40.091325] ? kmem_cache_alloc_trace+0x379/0x4b0 [ 40.096158] ? copy_mount_options+0x261/0x370 [ 40.100634] ksys_mount+0xcf/0x130 [ 40.104154] __x64_sys_mount+0xba/0x150 [ 40.108107] ? lockdep_hardirqs_on+0x3c1/0x5e0 [ 40.112668] do_syscall_64+0xf9/0x670 [ 40.116457] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.121624] RIP: 0033:0x446d4a [ 40.124811] Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00 [ 40.143698] RSP: 002b:00007fff86bca7c8 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 [ 40.151399] RAX: ffffffffffffffda RBX: 00007fff86bca820 RCX: 0000000000446d4a [ 40.158666] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fff86bca7e0 [ 40.165918] RBP: 00007fff86bca7e0 R08: 00007fff86bca820 R09: 00007fff00000015 [ 40.173164] R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000002 [ 40.180412] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 40.187669] ================================================================================ [ 40.198271] erofs: blksize 8388608 isn't supported on this platform