UBSAN: array-index-out-of-bounds in dtSplitPage

Date	Name	Commit	Repro	Result
2025/06/26	upstream (ToT)	ee88bddf7f2f	C	[report] UBSAN: array-index-out-of-bounds in dtSplitPage

Date

Name

Commit

Repro

Result

2025/06/26

upstream (ToT)

ee88bddf7f2f

[report] UBSAN: array-index-out-of-bounds in dtSplitPage

Kernel	Title	Repro	Cause bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: slab-use-after-free Write in dtSplitPage jfs	C	inconclusive	1407	21m	193d	0/29	upstream: reported C repro on 2024/12/15 23:15
linux-6.1	UBSAN: array-index-out-of-bounds in dtSplitPage origin:upstream	C		27	14d	179d	0/3	upstream: reported C repro on 2024/12/30 07:45
linux-5.15	UBSAN: array-index-out-of-bounds in dtSplitPage origin:upstream	C		42	1d13h	180d	0/3	upstream: reported C repro on 2024/12/29 06:57

syz-executor221[5765]: memfd_create() called without MFD_EXEC or MFD_NOEXEC_SEAL set loop0: detected capacity change from 0 to 32768 ================================================================================ UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:1601:11 index 26 is out of range for type 'struct lv[20]' CPU: 0 PID: 5765 Comm: syz-executor221 Not tainted 6.6.94-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: <TASK> dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 ubsan_epilogue+0xa/0x30 lib/ubsan.c:217 __ubsan_handle_out_of_bounds+0xe3/0xf0 lib/ubsan.c:348 dtSplitPage+0x38be/0x3b10 fs/jfs/jfs_dtree.c:1601 dtSplitUp fs/jfs/jfs_dtree.c:1092 [inline] dtInsert+0x108f/0x5f40 fs/jfs/jfs_dtree.c:871 jfs_create+0x6a1/0xa40 fs/jfs/namei.c:137 lookup_open fs/namei.c:3488 [inline] open_last_lookups fs/namei.c:3556 [inline] path_openat+0x1277/0x3190 fs/namei.c:3786 do_filp_open+0x1c5/0x3d0 fs/namei.c:3816 do_sys_openat2+0x12c/0x1c0 fs/open.c:1419 do_sys_open fs/open.c:1434 [inline] __do_sys_creat fs/open.c:1512 [inline] __se_sys_creat fs/open.c:1506 [inline] __x64_sys_creat+0x90/0xb0 fs/open.c:1506 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fd808a73a39 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff03ae0898 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fd808a73a39 RDX: 00007fd808a73a39 RSI: 0000000000000032 RDI: 00002000000008c0 RBP: 00007fd808aec610 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff03ae0a68 R14: 0000000000000001 R15: 0000000000000001 </TASK> ================================================================================

Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/06/22 03:42	linux-6.6.y	6282921b6825	d6cdfb8a	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)]	ci2-linux-6-6-kasan	UBSAN: array-index-out-of-bounds in dtSplitPage
2025/06/24 11:21	linux-6.6.y	6282921b6825	e2f27c35	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan	UBSAN: array-index-out-of-bounds in dtSplitPage
2025/06/24 11:20	linux-6.6.y	6282921b6825	e2f27c35	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan	UBSAN: array-index-out-of-bounds in dtSplitPage
2025/06/21 10:40	linux-6.6.y	6282921b6825	d6cdfb8a	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan	UBSAN: array-index-out-of-bounds in dtSplitPage
2025/06/21 10:40	linux-6.6.y	6282921b6825	d6cdfb8a	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan	UBSAN: array-index-out-of-bounds in dtSplitPage
2025/06/20 23:07	linux-6.6.y	6282921b6825	804b3919	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan	UBSAN: array-index-out-of-bounds in dtSplitPage
2025/06/20 23:07	linux-6.6.y	6282921b6825	804b3919	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan	UBSAN: array-index-out-of-bounds in dtSplitPage
2025/06/20 22:01	linux-6.6.y	6282921b6825	804b3919	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan	UBSAN: array-index-out-of-bounds in dtSplitPage
2025/06/20 22:00	linux-6.6.y	6282921b6825	804b3919	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan	UBSAN: array-index-out-of-bounds in dtSplitPage