syzbot


UBSAN: shift-out-of-bounds in parse_options

Status: upstream: reported C repro on 2023/01/08 05:56
Bug presence: origin:lts
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+298c1c62e38088db169c@syzkaller.appspotmail.com
First crash: 554d, last: 8d09h
Cause bisection: failed (error log, bisect log)
  
Bug presence (2)
Date Name Commit Repro Result
2023/10/28 lts (merge base) 12952a23a5da C [report] UBSAN: shift-out-of-bounds in parse_options
2023/10/28 upstream (ToT) 56567a20b22b C Didn't crash
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 UBSAN: shift-out-of-bounds in parse_options origin:lts-only C unreliable 3 2d21h 239d 0/3 upstream: reported C repro on 2023/11/19 20:08
Last patch testing requests (9)
Created Duration User Patch Repo Result
2024/06/27 13:19 6m retest repro android13-5.15-lts report log
2024/05/30 10:46 5m retest repro android13-5.15-lts error
2024/05/04 18:04 5m retest repro android13-5.15-lts report log
2024/04/18 12:17 27m retest repro android13-5.15-lts report log
2024/04/04 11:18 6m retest repro android13-5.15-lts report log
2024/03/21 10:00 13m retest repro android13-5.15-lts report log
2024/02/24 16:49 13m retest repro android13-5.15-lts report log
2023/04/12 05:56 22m tudor.ambarus@linaro.org git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev OK log
2023/04/07 11:02 12m tudor.ambarus@linaro.org git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-5.15.y report log
Fix bisection attempts (8)
Created Duration User Patch Repo Result
2024/06/03 21:48 50m bisect fix android13-5.15-lts OK (0) job log log
2023/12/16 15:24 36m bisect fix android13-5.15-lts OK (0) job log log
2023/10/28 01:39 34m bisect fix android13-5.15-lts OK (0) job log log
2023/06/09 23:50 16m bisect fix android13-5.15-lts OK (0) job log log
2023/05/10 18:57 41m bisect fix android13-5.15-lts OK (0) job log log
2023/04/09 01:19 22m bisect fix android13-5.15-lts OK (0) job log log
2023/03/09 18:29 45m bisect fix android13-5.15-lts OK (0) job log log
2023/02/07 17:54 18m bisect fix android13-5.15-lts OK (0) job log log

Sample crash report:
================================================================================
UBSAN: shift-out-of-bounds in fs/ext4/super.c:2493:15
shift exponent 1724006178 is too large for 32-bit type 'int'
CPU: 1 PID: 293 Comm: syz-executor355 Not tainted 5.15.150-syzkaller-00330-g9044d25b8ff5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 dump_stack+0x15/0x17 lib/dump_stack.c:113
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3bf/0x420 lib/ubsan.c:321
 parse_options+0x2c9d/0x2d20 fs/ext4/super.c:2493
 ext4_remount+0x8ff/0x2cf0 fs/ext4/super.c:5804
 legacy_reconfigure+0xfa/0x110 fs/fs_context.c:634
 reconfigure_super+0x436/0x860 fs/super.c:925
 do_remount fs/namespace.c:2661 [inline]
 path_mount+0xcc3/0x1070 fs/namespace.c:3327
 do_mount fs/namespace.c:3348 [inline]
 __do_sys_mount fs/namespace.c:3556 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3533
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3533
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f433c7a107a
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:00007fff59dc91b8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f433c7a107a
RDX: 0000000020000f40 RSI: 0000000020000f00 RDI: 0000000000000000
RBP: 0000000020000f00 R08: 00007fff59dc9250 R09: 0000000000000000
R10: 0000000001a4a438 R11: 0000000000000286 R12: 0000000020000f40
R13: 00007fff59dc9250 R14: 0000000000000000 R15: 00000000200008c0
 </TASK>
================================================================================
EXT4-fs (loop0): re-mounted. Opts: . Quota mode: none.
ext4 filesystem being remounted at /root/file1 supports timestamps until 2038 (0x7fffffff)

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/07/07 14:28 android13-5.15-lts 9044d25b8ff5 2a40360c .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2023/12/28 08:08 android13-5.15-lts 28e3f5851a99 fb427a07 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2023/11/02 05:55 android13-5.15-lts 61cfd264993d 69904c9f .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2023/07/03 09:57 android13-5.15-lts 241da2ad5601 bfc47836 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2023/01/08 05:54 android13-5.15-lts c73b4619ad86 1dac8c7a .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2024/07/07 14:15 android13-5.15-lts 9044d25b8ff5 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2023/09/27 03:40 android13-5.15-lts ea586874d2f9 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2023/09/20 12:27 android13-5.15-lts ea586874d2f9 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2023/09/18 02:50 android13-5.15-lts ea586874d2f9 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2023/07/06 20:22 android13-5.15-lts 879959450ec7 1a2f6297 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2023/07/03 09:38 android13-5.15-lts 241da2ad5601 bfc47836 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
* Struck through repros no longer work on HEAD.