[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ 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: [ 40.761721] audit: type=1400 audit(1600683842.417:8): avc: denied { execmem } for pid=6465 comm="syz-executor555" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 40.775969] ================================================================================ [ 40.790277] UBSAN: Undefined behaviour in fs/f2fs/super.c:2227:16 [ 40.796516] shift exponent 55 is too large for 32-bit type 'int' [ 40.802669] CPU: 1 PID: 6465 Comm: syz-executor555 Not tainted 4.19.146-syzkaller #0 [ 40.810990] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.820348] Call Trace: [ 40.822946] dump_stack+0x22c/0x33e [ 40.826585] ubsan_epilogue+0xe/0x3a [ 40.830296] __ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 [ 40.836477] ? __bread_gfp+0x81/0x300 [ 40.840305] f2fs_fill_super.cold+0x1f9/0x5fb [ 40.844827] ? vsnprintf+0x2cc/0x14f0 [ 40.848630] ? lock_downgrade+0x750/0x750 [ 40.852821] ? snprintf+0xbb/0xf0 [ 40.856311] ? f2fs_commit_super+0x400/0x400 [ 40.860701] ? __mutex_add_waiter+0x160/0x160 [ 40.865182] ? set_blocksize+0x163/0x3f0 [ 40.869231] mount_bdev+0x2fc/0x3b0 [ 40.872877] ? f2fs_commit_super+0x400/0x400 [ 40.877289] mount_fs+0xa3/0x318 [ 40.880640] vfs_kern_mount.part.0+0x68/0x470 [ 40.885135] do_mount+0x51c/0x2f10 [ 40.888677] ? do_raw_spin_unlock+0x171/0x240 [ 40.893172] ? check_preemption_disabled+0x41/0x2b0 [ 40.898182] ? copy_mount_string+0x40/0x40 [ 40.902407] ? kmem_cache_alloc_trace+0x379/0x4b0 [ 40.907248] ? copy_mount_options+0x261/0x370 [ 40.911725] ksys_mount+0xcf/0x130 [ 40.915261] __x64_sys_mount+0xba/0x150 [ 40.919218] ? lockdep_hardirqs_on+0x3c1/0x5e0 [ 40.923797] do_syscall_64+0xf9/0x670 [ 40.927584] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.932775] RIP: 0033:0x44776a [ 40.935950] 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 [ 40.954836] RSP: 002b:00007ffe53ce7248 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 [ 40.962542] RAX: ffffffffffffffda RBX: 00007ffe53ce72a0 RCX: 000000000044776a [ 40.969812] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe53ce7260 [ 40.977064] RBP: 00007ffe53ce7260 R08: 00007ffe53ce72a0 R09: 00007ffe00000015 [ 40.984315] R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000045 [ 40.991564] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 40.998834] ================================================================================ [ 41.008457] F2FS-fs (loop0): Invalid blocksize (8388608), supports only 4KB [ 41.008457] [ 41.017337] F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock [ 41.025201] F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0) [ 41.032218] F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock [ 41.041212] F2FS-fs (loop0): Invalid blocksize (8388608), supports only 4KB [ 41.041212] [ 41.049875] F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock [ 41.057467] F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010)