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UBSAN: shift-out-of-bounds in parse_options

Status: upstream: reported C repro on 2024/08/17 08:59
Bug presence: origin:lts
[Documentation on labels]
Reported-by: syzbot+561af80c4a21ada6cf3e@syzkaller.appspotmail.com
First crash: 30d, last: 7d14h
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2024/08/17 lts (merge base) 909ba1f1b414 C [report] UBSAN: shift-out-of-bounds in parse_options
2024/08/17 upstream (ToT) e5fa841af679 C Didn't crash
▶ ▼ Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 UBSAN: shift-out-of-bounds in parse_options ext4 origin:lts C error 31 3d04h 617d 0/2 upstream: reported C repro on 2023/01/08 05:56
linux-6.1 UBSAN: shift-out-of-bounds in parse_options origin:lts-only C 7 29d 33d 0/3 upstream: reported C repro on 2024/08/13 23:52
linux-5.15 UBSAN: shift-out-of-bounds in parse_options origin:lts-only C unreliable 38 1d10h 301d 0/3 upstream: reported C repro on 2023/11/19 20:08

Sample crash report:
loop0: detected capacity change from 0 to 40427
================================================================================
UBSAN: shift-out-of-bounds in fs/f2fs/super.c:911:5
shift exponent 105 is too large for 64-bit type 'unsigned long'
CPU: 1 PID: 292 Comm: syz-executor202 Not tainted 6.1.90-syzkaller-00020-gd6a513a78492 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 dump_stack+0x15/0x1c lib/dump_stack.c:113
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3e1/0x440 lib/ubsan.c:321
 parse_options+0x4b90/0x4ba0 fs/f2fs/super.c:911
 f2fs_fill_super+0x23bc/0x6dc0 fs/f2fs/super.c:4288
 mount_bdev+0x282/0x3b0 fs/super.c:1434
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4724
 legacy_get_tree+0xf1/0x190 fs/fs_context.c:632
 vfs_get_tree+0x88/0x290 fs/super.c:1564
 do_new_mount+0x2ba/0xb30 fs/namespace.c:3051
 path_mount+0x671/0x1070 fs/namespace.c:3381
 do_mount fs/namespace.c:3394 [inline]
 __do_sys_mount fs/namespace.c:3602 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3579
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3579
 x64_sys_call+0x49d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd7f1143cfa
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ffc8943f878 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc8943f890 RCX: 00007fd7f1143cfa
RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 00007ffc8943f890
RBP: 0000000000000004 R08: 00007ffc8943f8d0 R09: 00000000000054fa
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000000
R13: 00007ffc8943f8d0 R14: 0000000000000003 R15: 00000000013bd7ef
 </TASK>
================================================================================
F2FS-fs (loop0): Not support 2199023255552, larger than 256

Crashes (14):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/08/17 09:04 android14-6.1 d6a513a78492 dbc93b08 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
2024/08/17 08:58 android14-6.1 d6a513a78492 dbc93b08 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
2024/08/17 08:52 android14-6.1 d6a513a78492 dbc93b08 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
2024/09/09 04:08 android14-6.1 27310ed6b677 9750182a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
2024/09/08 07:18 android14-6.1 27310ed6b677 9750182a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
2024/09/08 07:17 android14-6.1 27310ed6b677 9750182a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
2024/09/01 22:30 android14-6.1 b5e374dda921 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
2024/09/01 18:09 android14-6.1 b5e374dda921 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
2024/09/01 15:05 android14-6.1 b5e374dda921 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
2024/09/01 08:26 android14-6.1 b5e374dda921 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
2024/08/31 14:35 android14-6.1 b5e374dda921 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
2024/08/17 20:05 android14-6.1 d6a513a78492 dbc93b08 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
2024/08/17 08:44 android14-6.1 d6a513a78492 dbc93b08 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
2024/08/17 08:44 android14-6.1 d6a513a78492 dbc93b08 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 UBSAN: shift-out-of-bounds in parse_options
* Struck through repros no longer work on HEAD.