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UBSAN: shift-out-of-bounds in aio_iiro_16_attach

Status: upstream: reported C repro on 2025/07/21 17:32
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+2878aad7ec0921e901b5@syzkaller.appspotmail.com
First crash: 40d, last: 6d10h
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/07/25 linux-5.15.y (ToT) c79648372d02 C [report] UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/24 upstream (ToT) dd9c17322a6c C Didn't crash
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream UBSAN: shift-out-of-bounds in aio_iiro_16_attach comedi -1 C 56 42d 54d 0/29 upstream: reported C repro on 2025/07/07 16:32
linux-6.6 UBSAN: shift-out-of-bounds in aio_iiro_16_attach -1 2 39d 39d 0/2 upstream: reported on 2025/07/22 11:15
linux-6.1 UBSAN: shift-out-of-bounds in aio_iiro_16_attach -1 5 38d 40d 0/3 upstream: reported on 2025/07/21 19:38

Sample crash report:
================================================================================
UBSAN: shift-out-of-bounds in drivers/comedi/drivers/aio_iiro_16.c:181:9
shift exponent 8550 is too large for 32-bit type 'int'
CPU: 0 PID: 4312 Comm: syz.0.16 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 ubsan_epilogue+0xa/0x30 lib/ubsan.c:151
 __ubsan_handle_shift_out_of_bounds+0x37c/0x400 lib/ubsan.c:321
 aio_iiro_16_attach+0x5db/0x790 drivers/comedi/drivers/aio_iiro_16.c:181
 comedi_device_attach+0x515/0x650 drivers/comedi/drivers.c:996
 do_devconfig_ioctl drivers/comedi/comedi_fops.c:851 [inline]
 comedi_unlocked_ioctl+0x5ec/0xe90 drivers/comedi/comedi_fops.c:2131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f5cfb0d49a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd00dd9fb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5cfb2fbfa0 RCX: 00007f5cfb0d49a9
RDX: 0000200000000140 RSI: 0000000040946400 RDI: 0000000000000003
RBP: 00007f5cfb156d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5cfb2fbfa0 R14: 00007f5cfb2fbfa0 R15: 0000000000000003
 </TASK>
================================================================================

Crashes (29):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/21 22:05 linux-5.15.y c79648372d02 56d87229 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/24 21:59 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/24 21:59 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/23 18:54 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/23 18:04 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/23 00:29 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/23 00:27 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/22 13:55 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/22 13:55 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/15 17:05 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/15 17:04 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/10 05:55 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/09 18:23 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/08 23:27 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/08 23:27 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/08/06 10:03 linux-5.15.y c79648372d02 ffe1dd46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/28 10:23 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/28 10:23 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/28 01:34 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/28 01:34 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/26 17:37 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/26 17:36 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/23 12:47 linux-5.15.y c79648372d02 e1dd4f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/23 01:32 linux-5.15.y c79648372d02 8e9d1dc1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/23 01:32 linux-5.15.y c79648372d02 8e9d1dc1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/22 09:17 linux-5.15.y c79648372d02 1555463b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/22 09:17 linux-5.15.y c79648372d02 1555463b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/21 17:32 linux-5.15.y c79648372d02 56d87229 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/21 17:32 linux-5.15.y c79648372d02 56d87229 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: shift-out-of-bounds in aio_iiro_16_attach
* Struck through repros no longer work on HEAD.