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UBSAN: shift-out-of-bounds in dbDiscardAG

Status: fixed on 2024/08/14 03:44
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+61be3359d2ee3467e7e4@syzkaller.appspotmail.com
Fix commit: 7063b80268e2 jfs: Fix shift-out-of-bounds in dbDiscardAG
First crash: 354d, last: 334d
Cause bisection: introduced by (bisect log) [merge commit]:
commit a79cdfba68a13b731004f0aafe1155a83830d472
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed May 5 20:44:19 2021 +0000

  Merge tag 'nfsd-5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

Crash: lost connection to test machine (log)
Repro: C syz .config
  
▶ ▼ Discussions (11)
Title Replies (including bot) Last reply
[PATCH 5.10.y] jfs: Fix shift-out-of-bounds in dbDiscardAG 1 (1) 2025/04/16 01:51
[PATCH 5.15.y] jfs: Fix shift-out-of-bounds in dbDiscardAG 1 (1) 2025/04/16 01:49
[PATCH AUTOSEL 4.19 1/2] jfs: fix null ptr deref in dtInsertEntry 2 (2) 2024/07/30 12:46
[PATCH AUTOSEL 5.4 1/2] jfs: fix null ptr deref in dtInsertEntry 2 (2) 2024/07/30 12:46
[PATCH AUTOSEL 5.10 3/3] jfs: Fix shift-out-of-bounds in dbDiscardAG 1 (1) 2024/07/30 12:46
[PATCH AUTOSEL 5.15 3/3] jfs: Fix shift-out-of-bounds in dbDiscardAG 1 (1) 2024/07/30 12:46
[PATCH AUTOSEL 6.1 3/3] jfs: Fix shift-out-of-bounds in dbDiscardAG 1 (1) 2024/07/30 12:45
[PATCH AUTOSEL 6.6 1/7] f2fs: fix to do sanity check on F2FS_INLINE_DATA flag in inode during GC 4 (4) 2024/07/30 12:45
[PATCH AUTOSEL 6.10 1/7] f2fs: fix to do sanity check on F2FS_INLINE_DATA flag in inode during GC 4 (4) 2024/07/30 12:45
[PATCH] jfs: Fix shift-out-of-bounds in dbDiscardAG 1 (1) 2024/06/25 16:42
[syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbDiscardAG 0 (2) 2024/06/25 05:27
▶ ▼ Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 UBSAN: shift-out-of-bounds in dbDiscardAG origin:lts-only C error 102 46d 299d 0/3 upstream: reported C repro on 2024/08/11 07:51
linux-6.1 UBSAN: shift-out-of-bounds in dbDiscardAG 1 799d 799d 0/3 auto-obsoleted due to no activity on 2023/07/28 02:34
linux-6.1 UBSAN: shift-out-of-bounds in dbDiscardAG (2) origin:lts-only C done 5 292d 296d 3/3 fixed on 2024/09/23 09:27
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/06/25 05:27 19m peili.dev@gmail.com patch upstream OK log

Sample crash report:
loop0: detected capacity change from 0 to 32768
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:1629:18
shift exponent -1 is negative
CPU: 0 PID: 5086 Comm: syz-executor290 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #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+0x241/0x360 lib/dump_stack.c:114
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468
 dbDiscardAG+0x5a7/0xa10 fs/jfs/jfs_dmap.c:1629
 jfs_ioc_trim+0x433/0x670 fs/jfs/jfs_discard.c:100
 jfs_ioctl+0x2d0/0x3e0 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6e9952bad9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 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:00007fff9232dc18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6e9952bad9
RDX: 0000000020000080 RSI: 00000000c0185879 RDI: 0000000000000004
RBP: 00007f6e995a45f0 R08: 000055556d87a4c0 R09: 000055556d87a4c0
R10: 0000000000005ea4 R11: 0000000000000246 R12: 00007fff9232dc40
R13: 00007fff9232de68 R14: 431bde82d7b634db R15: 00007f6e9957403b
 </TASK>
---[ end trace ]---

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/20 15:27 upstream 2ccbdf43d5e7 dac2aa43 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbDiscardAG
2024/07/06 20:19 upstream 1dd28064d416 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbDiscardAG
2024/06/20 14:42 upstream 2ccbdf43d5e7 dac2aa43 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbDiscardAG
2024/06/17 15:02 upstream 2ccbdf43d5e7 c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 UBSAN: shift-out-of-bounds in dbDiscardAG
2024/06/17 15:01 upstream 2ccbdf43d5e7 c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 UBSAN: shift-out-of-bounds in dbDiscardAG
* Struck through repros no longer work on HEAD.