UBSAN: undefined-behaviour in ext4_fill

audit: type=1400 audit(1601632956.817:8): avc:  denied  { execmem } for  pid=6496 comm="syz-executor397" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
================================================================================
UBSAN: Undefined behaviour in fs/ext4/super.c:3763:25
shift exponent 32770 is too large for 32-bit type 'int'
CPU: 0 PID: 6496 Comm: syz-executor397 Not tainted 4.19.149-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x22c/0x33e lib/dump_stack.c:118
 ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
 __ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
 ext4_fill_super.cold+0x33b/0x4ea fs/ext4/super.c:3763
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x318 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x51c/0x2f10 fs/namespace.c:2799
 ksys_mount+0xcf/0x130 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3026
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446d1a
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
RSP: 002b:00007ffe166dad48 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe166dada0 RCX: 0000000000446d1a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe166dad60
RBP: 00007ffe166dad60 R08: 00007ffe166dada0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000001
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003
================================================================================
EXT4-f

Crashes (770):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Manager
2020/10/02 10:04	linux-4.19.y	b09c34517e1a	9602ddf4	.config	console log	report	syz	C		ci2-linux-4-19
2020/09/20 16:22	linux-4.19.y	015e94d0e37b	9564d2e9	.config	console log	report	syz	C		ci2-linux-4-19
2020/10/21 20:12	linux-4.19.y	ad326970d25c	99c64d5c	.config	console log	report			info	ci2-linux-4-19
2020/10/21 19:08	linux-4.19.y	ad326970d25c	99c64d5c	.config	console log	report			info	ci2-linux-4-19
2020/10/21 16:25	linux-4.19.y	ad326970d25c	99c64d5c	.config	console log	report			info	ci2-linux-4-19
2020/10/21 14:58	linux-4.19.y	ad326970d25c	99c64d5c	.config	console log	report			info	ci2-linux-4-19
2020/10/21 13:34	linux-4.19.y	ad326970d25c	99c64d5c	.config	console log	report			info	ci2-linux-4-19
2020/10/21 08:15	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/21 07:00	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/21 01:20	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/21 00:09	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/20 22:43	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/20 20:31	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/20 15:58	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/20 14:03	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/20 10:44	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/20 08:49	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/20 05:14	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/20 04:05	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/20 02:32	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/20 01:11	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/19 22:25	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/19 21:10	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/19 20:09	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/19 18:47	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/19 17:43	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/19 15:05	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/19 13:58	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/19 12:54	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/19 10:56	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/19 07:05	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/19 04:33	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/18 23:46	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/18 19:34	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/18 18:07	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/18 15:52	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/18 14:46	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/18 11:36	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/18 09:21	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/18 06:30	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/18 02:33	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/18 01:02	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/17 23:57	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/17 22:50	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/17 22:40	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/17 19:50	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/17 16:41	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/09/20 14:31	linux-4.19.y	015e94d0e37b	9564d2e9	.config	console log	report			info	ci2-linux-4-19

Crashes (770):

Time

Assets (help?)

2020/10/02 10:04

linux-4.19.y

syz

ci2-linux-4-19

2020/09/20 16:22

linux-4.19.y

syz

ci2-linux-4-19

2020/10/21 20:12

linux-4.19.y

ci2-linux-4-19

2020/10/21 19:08

linux-4.19.y

ci2-linux-4-19

2020/10/21 16:25

linux-4.19.y

ci2-linux-4-19

2020/10/21 14:58

linux-4.19.y

ci2-linux-4-19

2020/10/21 13:34

linux-4.19.y

ci2-linux-4-19

2020/10/21 08:15

linux-4.19.y

ci2-linux-4-19

2020/10/21 07:00

linux-4.19.y

ci2-linux-4-19

2020/10/21 01:20

linux-4.19.y

ci2-linux-4-19

2020/10/21 00:09

linux-4.19.y

ci2-linux-4-19

2020/10/20 22:43

linux-4.19.y

ci2-linux-4-19

2020/10/20 20:31

linux-4.19.y

ci2-linux-4-19

2020/10/20 15:58

linux-4.19.y

ci2-linux-4-19

2020/10/20 14:03

linux-4.19.y

ci2-linux-4-19

2020/10/20 10:44

linux-4.19.y

ci2-linux-4-19

2020/10/20 08:49

linux-4.19.y

ci2-linux-4-19

2020/10/20 05:14

linux-4.19.y

ci2-linux-4-19

2020/10/20 04:05

linux-4.19.y

ci2-linux-4-19

2020/10/20 02:32

linux-4.19.y

ci2-linux-4-19

2020/10/20 01:11

linux-4.19.y

ci2-linux-4-19

2020/10/19 22:25

linux-4.19.y

ci2-linux-4-19

2020/10/19 21:10

linux-4.19.y

ci2-linux-4-19

2020/10/19 20:09

linux-4.19.y

ci2-linux-4-19

2020/10/19 18:47

linux-4.19.y

ci2-linux-4-19

2020/10/19 17:43

linux-4.19.y

ci2-linux-4-19

2020/10/19 15:05

linux-4.19.y

ci2-linux-4-19

2020/10/19 13:58

linux-4.19.y

ci2-linux-4-19

2020/10/19 12:54

linux-4.19.y

ci2-linux-4-19

2020/10/19 10:56

linux-4.19.y

ci2-linux-4-19

2020/10/19 07:05

linux-4.19.y

ci2-linux-4-19

2020/10/19 04:33

linux-4.19.y

ci2-linux-4-19

2020/10/18 23:46

linux-4.19.y

ci2-linux-4-19

2020/10/18 19:34

linux-4.19.y

ci2-linux-4-19

2020/10/18 18:07

linux-4.19.y

ci2-linux-4-19

2020/10/18 15:52

linux-4.19.y

ci2-linux-4-19

2020/10/18 14:46

linux-4.19.y

ci2-linux-4-19

2020/10/18 11:36

linux-4.19.y

ci2-linux-4-19

2020/10/18 09:21

linux-4.19.y

ci2-linux-4-19

2020/10/18 06:30

linux-4.19.y

ci2-linux-4-19

2020/10/18 02:33

linux-4.19.y

ci2-linux-4-19

2020/10/18 01:02

linux-4.19.y

ci2-linux-4-19

2020/10/17 23:57

linux-4.19.y

ci2-linux-4-19

2020/10/17 22:50

linux-4.19.y

ci2-linux-4-19

2020/10/17 22:40

linux-4.19.y

ci2-linux-4-19

2020/10/17 19:50

linux-4.19.y

ci2-linux-4-19

2020/10/17 16:41

linux-4.19.y

ci2-linux-4-19

2020/09/20 14:31

linux-4.19.y

ci2-linux-4-19