UBSAN: undefined-behaviour in arch_uprobe_analyze

audit: type=1400 audit(1603298439.994:8): avc:  denied  { execmem } for  pid=8114 comm="syz-executor178" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
================================================================================
UBSAN: Undefined behaviour in arch/x86/kernel/uprobes.c:276:56
index 4 is out of range for type 'insn_byte_t [4]'
CPU: 1 PID: 8114 Comm: syz-executor178 Not tainted 4.19.152-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_out_of_bounds.cold+0x63/0x6f lib/ubsan.c:383
 is_prefix_bad arch/x86/kernel/uprobes.c:276 [inline]
 uprobe_init_insn arch/x86/kernel/uprobes.c:299 [inline]
 arch_uprobe_analyze_insn+0x9d8/0xaa0 arch/x86/kernel/uprobes.c:868
 prepare_uprobe kernel/events/uprobes.c:611 [inline]
 install_breakpoint kernel/events/uprobes.c:654 [inline]
 uprobe_mmap+0x8c2/0xa70 kernel/events/uprobes.c:1096
 mmap_region+0x552/0x1510 mm/mmap.c:1803
 do_mmap+0x8e8/0x1080 mm/mmap.c:1530
 do_mmap_pgoff include/linux/mm.h:2326 [inline]
 vm_mmap_pgoff+0x197/0x200 mm/util.c:357
 ksys_mmap_pgoff+0x2d1/0x660 mm/mmap.c:1580
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440379
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff00a08798 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440379
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020007000
RBP: 00000000006ca018 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000412 R11: 0000000000000246 R12: 0000000000401b80
R13: 0000000000401c10 R14: 0000000000000000 R15: 0000000000000000
==========================================================

Crashes (288):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Manager
2020/10/21 16:42	linux-4.19.y	ad326970d25c	99c64d5c	.config	console log	report	syz	C		ci2-linux-4-19
2020/10/06 00:28	linux-4.19.y	b09c34517e1a	1880b4a9	.config	console log	report	syz	C		ci2-linux-4-19
2020/10/05 18:40	linux-4.19.y	b09c34517e1a	1880b4a9	.config	console log	report	syz	C		ci2-linux-4-19
2020/10/02 10:17	linux-4.19.y	b09c34517e1a	9602ddf4	.config	console log	report	syz	C		ci2-linux-4-19
2020/09/20 16:48	linux-4.19.y	015e94d0e37b	9564d2e9	.config	console log	report	syz	C		ci2-linux-4-19
2020/10/21 19:20	linux-4.19.y	ad326970d25c	99c64d5c	.config	console log	report			info	ci2-linux-4-19
2020/10/21 16:36	linux-4.19.y	ad326970d25c	99c64d5c	.config	console log	report			info	ci2-linux-4-19
2020/10/21 14:29	linux-4.19.y	ad326970d25c	99c64d5c	.config	console log	report			info	ci2-linux-4-19
2020/10/21 08:08	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/20 03:41	linux-4.19.y	ad326970d25c	ff4a3345	.config	console log	report			info	ci2-linux-4-19
2020/10/19 05:10	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/18 00:29	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/17 23:14	linux-4.19.y	ad326970d25c	fea47c01	.config	console log	report			info	ci2-linux-4-19
2020/10/17 06:41	linux-4.19.y	a1b977b49b66	6e262c73	.config	console log	report			info	ci2-linux-4-19
2020/10/17 00:01	linux-4.19.y	a1b977b49b66	6e262c73	.config	console log	report			info	ci2-linux-4-19
2020/10/16 21:27	linux-4.19.y	a1b977b49b66	6e262c73	.config	console log	report			info	ci2-linux-4-19
2020/10/16 07:26	linux-4.19.y	a1b977b49b66	6e262c73	.config	console log	report			info	ci2-linux-4-19
2020/10/16 03:49	linux-4.19.y	a1b977b49b66	6e262c73	.config	console log	report			info	ci2-linux-4-19
2020/10/16 00:10	linux-4.19.y	a1b977b49b66	6e262c73	.config	console log	report			info	ci2-linux-4-19
2020/10/15 22:43	linux-4.19.y	a1b977b49b66	6e262c73	.config	console log	report			info	ci2-linux-4-19
2020/10/15 07:38	linux-4.19.y	a1b977b49b66	fc7735a2	.config	console log	report			info	ci2-linux-4-19
2020/10/14 15:24	linux-4.19.y	a1b977b49b66	fc7735a2	.config	console log	report			info	ci2-linux-4-19
2020/10/13 14:35	linux-4.19.y	a1b977b49b66	bd69ee0d	.config	console log	report			info	ci2-linux-4-19
2020/10/13 09:59	linux-4.19.y	a1b977b49b66	bd69ee0d	.config	console log	report			info	ci2-linux-4-19
2020/10/12 14:20	linux-4.19.y	a1b977b49b66	4a77ae0b	.config	console log	report			info	ci2-linux-4-19
2020/10/12 11:25	linux-4.19.y	a1b977b49b66	4a77ae0b	.config	console log	report			info	ci2-linux-4-19
2020/10/12 09:33	linux-4.19.y	a1b977b49b66	4a77ae0b	.config	console log	report			info	ci2-linux-4-19
2020/10/11 08:39	linux-4.19.y	a1b977b49b66	4a77ae0b	.config	console log	report			info	ci2-linux-4-19
2020/10/11 08:27	linux-4.19.y	a1b977b49b66	4a77ae0b	.config	console log	report			info	ci2-linux-4-19
2020/10/10 16:58	linux-4.19.y	a1b977b49b66	b74c49a6	.config	console log	report			info	ci2-linux-4-19
2020/10/10 08:55	linux-4.19.y	a1b977b49b66	b74c49a6	.config	console log	report			info	ci2-linux-4-19
2020/10/09 10:46	linux-4.19.y	a1b977b49b66	fa79ed2a	.config	console log	report			info	ci2-linux-4-19
2020/10/08 08:26	linux-4.19.y	a1b977b49b66	1880b4a9	.config	console log	report			info	ci2-linux-4-19
2020/10/08 00:14	linux-4.19.y	a1b977b49b66	1880b4a9	.config	console log	report			info	ci2-linux-4-19
2020/10/07 00:26	linux-4.19.y	b09c34517e1a	1880b4a9	.config	console log	report			info	ci2-linux-4-19
2020/10/06 14:26	linux-4.19.y	b09c34517e1a	1880b4a9	.config	console log	report			info	ci2-linux-4-19
2020/10/06 06:40	linux-4.19.y	b09c34517e1a	1880b4a9	.config	console log	report			info	ci2-linux-4-19
2020/10/06 04:57	linux-4.19.y	b09c34517e1a	1880b4a9	.config	console log	report			info	ci2-linux-4-19
2020/10/06 03:21	linux-4.19.y	b09c34517e1a	1880b4a9	.config	console log	report			info	ci2-linux-4-19
2020/10/05 21:48	linux-4.19.y	b09c34517e1a	1880b4a9	.config	console log	report			info	ci2-linux-4-19
2020/10/05 18:29	linux-4.19.y	b09c34517e1a	1880b4a9	.config	console log	report			info	ci2-linux-4-19
2020/10/05 15:20	linux-4.19.y	b09c34517e1a	1880b4a9	.config	console log	report			info	ci2-linux-4-19
2020/10/05 06:39	linux-4.19.y	b09c34517e1a	5ef9c291	.config	console log	report			info	ci2-linux-4-19
2020/10/04 11:07	linux-4.19.y	b09c34517e1a	5ef9c291	.config	console log	report			info	ci2-linux-4-19
2020/10/04 05:33	linux-4.19.y	b09c34517e1a	1a3f9408	.config	console log	report			info	ci2-linux-4-19
2020/10/03 20:54	linux-4.19.y	b09c34517e1a	1a3f9408	.config	console log	report			info	ci2-linux-4-19
2020/10/03 18:17	linux-4.19.y	b09c34517e1a	1a3f9408	.config	console log	report			info	ci2-linux-4-19
2020/10/03 08:14	linux-4.19.y	b09c34517e1a	2653fa43	.config	console log	report			info	ci2-linux-4-19
2020/10/02 21:41	linux-4.19.y	b09c34517e1a	062c9832	.config	console log	report			info	ci2-linux-4-19
2020/10/02 16:22	linux-4.19.y	b09c34517e1a	062c9832	.config	console log	report			info	ci2-linux-4-19
2020/10/02 10:41	linux-4.19.y	b09c34517e1a	9602ddf4	.config	console log	report			info	ci2-linux-4-19
2020/10/02 08:31	linux-4.19.y	b09c34517e1a	9602ddf4	.config	console log	report			info	ci2-linux-4-19
2020/09/17 01:47	linux-4.19.y	a87f96283793	8247808b	.config	console log	report			info	ci2-linux-4-19

Crashes (288):

Time

Assets (help?)

2020/10/21 16:42

linux-4.19.y

syz

ci2-linux-4-19

2020/10/06 00:28

linux-4.19.y

syz

ci2-linux-4-19

2020/10/05 18:40

linux-4.19.y

syz

ci2-linux-4-19

2020/10/02 10:17

linux-4.19.y

syz

ci2-linux-4-19

2020/09/20 16:48

linux-4.19.y

syz

ci2-linux-4-19

2020/10/21 19:20

linux-4.19.y

ci2-linux-4-19

2020/10/21 16:36

linux-4.19.y

ci2-linux-4-19

2020/10/21 14:29

linux-4.19.y

ci2-linux-4-19

2020/10/21 08:08

linux-4.19.y

ci2-linux-4-19

2020/10/20 03:41

linux-4.19.y

ci2-linux-4-19

2020/10/19 05:10

linux-4.19.y

ci2-linux-4-19

2020/10/18 00:29

linux-4.19.y

ci2-linux-4-19

2020/10/17 23:14

linux-4.19.y

ci2-linux-4-19

2020/10/17 06:41

linux-4.19.y

ci2-linux-4-19

2020/10/17 00:01

linux-4.19.y

ci2-linux-4-19

2020/10/16 21:27

linux-4.19.y

ci2-linux-4-19

2020/10/16 07:26

linux-4.19.y

ci2-linux-4-19

2020/10/16 03:49

linux-4.19.y

ci2-linux-4-19

2020/10/16 00:10

linux-4.19.y

ci2-linux-4-19

2020/10/15 22:43

linux-4.19.y

ci2-linux-4-19

2020/10/15 07:38

linux-4.19.y

ci2-linux-4-19

2020/10/14 15:24

linux-4.19.y

ci2-linux-4-19

2020/10/13 14:35

linux-4.19.y

ci2-linux-4-19

2020/10/13 09:59

linux-4.19.y

ci2-linux-4-19

2020/10/12 14:20

linux-4.19.y

ci2-linux-4-19

2020/10/12 11:25

linux-4.19.y

ci2-linux-4-19

2020/10/12 09:33

linux-4.19.y

ci2-linux-4-19

2020/10/11 08:39

linux-4.19.y

ci2-linux-4-19

2020/10/11 08:27

linux-4.19.y

ci2-linux-4-19

2020/10/10 16:58

linux-4.19.y

ci2-linux-4-19

2020/10/10 08:55

linux-4.19.y

ci2-linux-4-19

2020/10/09 10:46

linux-4.19.y

ci2-linux-4-19

2020/10/08 08:26

linux-4.19.y

ci2-linux-4-19

2020/10/08 00:14

linux-4.19.y

ci2-linux-4-19

2020/10/07 00:26

linux-4.19.y

ci2-linux-4-19

2020/10/06 14:26

linux-4.19.y

ci2-linux-4-19

2020/10/06 06:40

linux-4.19.y

ci2-linux-4-19

2020/10/06 04:57

linux-4.19.y

ci2-linux-4-19

2020/10/06 03:21

linux-4.19.y

ci2-linux-4-19

2020/10/05 21:48

linux-4.19.y

ci2-linux-4-19

2020/10/05 18:29

linux-4.19.y

ci2-linux-4-19

2020/10/05 15:20

linux-4.19.y

ci2-linux-4-19

2020/10/05 06:39

linux-4.19.y

ci2-linux-4-19

2020/10/04 11:07

linux-4.19.y

ci2-linux-4-19

2020/10/04 05:33

linux-4.19.y

ci2-linux-4-19

2020/10/03 20:54

linux-4.19.y

ci2-linux-4-19

2020/10/03 18:17

linux-4.19.y

ci2-linux-4-19

2020/10/03 08:14

linux-4.19.y

ci2-linux-4-19

2020/10/02 21:41

linux-4.19.y

ci2-linux-4-19

2020/10/02 16:22

linux-4.19.y

ci2-linux-4-19

2020/10/02 10:41

linux-4.19.y

ci2-linux-4-19

2020/10/02 08:31

linux-4.19.y

ci2-linux-4-19

2020/09/17 01:47

linux-4.19.y

ci2-linux-4-19