UBSAN: shift-out-of-bounds in dbAllocAG

Status: fixed on 2023/02/24 13:50
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+15342c1aa6a00fb7a438@syzkaller.appspotmail.com
Fix commit: 898f70669568 fs: jfs: fix shift-out-of-bounds in dbAllocAG
First crash: 1414d, last: 1381d
Cause bisection: failed (error log, bisect log)
  
▶ ▼ Duplicate bugs (1)
Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
UBSAN: shift-out-of-bounds in jfs_open jfs -1 syz, C 5 1368d 1415d 0/29 closed as dup on 2022/09/29 01:37
▶ ▼ Discussions (11)
Title Replies (including bot) Last reply
[PATCH AUTOSEL 6.1 01/22] fs: jfs: fix shift-out-of-bounds in dbAllocAG 24 (24) 2022/12/18 11:28
[PATCH AUTOSEL 6.0 01/16] fs: jfs: fix shift-out-of-bounds in dbAllocAG 18 (18) 2022/12/18 11:26
[PATCH AUTOSEL 5.4 1/9] fs: jfs: fix shift-out-of-bounds in dbAllocAG 10 (10) 2022/12/17 18:05
[PATCH AUTOSEL 4.9 1/8] fs: jfs: fix shift-out-of-bounds in dbAllocAG 8 (8) 2022/12/17 15:30
[PATCH AUTOSEL 4.14 1/8] fs: jfs: fix shift-out-of-bounds in dbAllocAG 8 (8) 2022/12/17 15:30
[PATCH AUTOSEL 4.19 1/8] fs: jfs: fix shift-out-of-bounds in dbAllocAG 8 (8) 2022/12/17 15:30
[PATCH AUTOSEL 5.10 1/9] fs: jfs: fix shift-out-of-bounds in dbAllocAG 9 (9) 2022/12/17 15:29
[PATCH AUTOSEL 5.15 01/10] fs: jfs: fix shift-out-of-bounds in dbAllocAG 10 (10) 2022/12/17 15:29
[PATCH v2] fs: jfs: fix shift-out-of-bounds in dbAllocAG 2 (2) 2022/10/17 20:02
[PATCH] fs: jfs: fix shift-out-of-bounds in dbAllocAG 5 (5) 2022/10/14 08:45
[syzbot] UBSAN: shift-out-of-bounds in dbAllocAG 0 (1) 2022/09/28 20:43
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream UBSAN: shift-out-of-bounds in dbAllocAG (2) jfs -1 syz, C done 5 471d 521d 29/29 fixed on 2025/07/08 00:33
upstream UBSAN: shift-out-of-bounds in dbAllocAG (3) jfs -1 syz, C error error 7 206d 298d 0/29 upstream: reported C repro on 2025/10/17 04:35
▶ ▼ Last patch testing requests (3)
Created Duration User Patch Repo Result
2022/10/14 01:24 17m mudongliangabcd@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git -- error
2022/09/29 05:06 16m mudongliangabcd@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git -- OK log
2022/09/29 01:12 6m mudongliangabcd@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git -- error

Sample crash report:
loop0: detected capacity change from 0 to 32768
================================================================================
UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:1313:21
shift exponent 8345714 is too large for 64-bit type 'long long int'
CPU: 1 PID: 3604 Comm: syz-executor158 Not tainted 6.0.0-syzkaller-07994-ge8bc52cb8df8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 ubsan_epilogue+0xb/0x50 lib/ubsan.c:151
 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x187 lib/ubsan.c:322
 dbAllocAG.cold+0xf1/0x11c fs/jfs/jfs_dmap.c:1313
 dbAlloc+0x40d/0xa70 fs/jfs/jfs_dmap.c:858
 diNewIAG fs/jfs/jfs_imap.c:2500 [inline]
 diAllocExt fs/jfs/jfs_imap.c:1898 [inline]
 diAllocAG+0xb93/0x2200 fs/jfs/jfs_imap.c:1662
 diAlloc+0x82d/0x1730 fs/jfs/jfs_imap.c:1583
 ialloc+0x89/0xaa0 fs/jfs/jfs_inode.c:56
 jfs_mkdir+0x1f0/0xab0 fs/jfs/namei.c:225
 vfs_mkdir+0x489/0x740 fs/namei.c:4013
 do_mkdirat+0x28c/0x310 fs/namei.c:4038
 __do_sys_mkdir fs/namei.c:4058 [inline]
 __se_sys_mkdir fs/namei.c:4056 [inline]
 __x64_sys_mkdir+0xf2/0x140 fs/namei.c:4056
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa750492da9
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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff03b1f728 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa750492da9
RDX: 00007fa7504512a3 RSI: 0000000000000000 RDI: 00000000200052c0
RBP: 00007fa750452570 R08: 00005555568002c0 R09: 0000000000000000
R10: 00007fff03b1f5f0 R11: 0000000000000246 R12: 00000000f8008000
R13: 0000000000000000 R14: 00080000000000fc R15: 0000000000000000
 </TASK>
================================================================================

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/10/08 21:51 upstream e8bc52cb8df8 aea5da89 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] ci-upstream-kasan-gce-root UBSAN: shift-out-of-bounds in dbAllocAG
2022/10/03 07:26 upstream a962b54e162c feb56351 .config strace log report syz C [disk image] [vmlinux] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbAllocAG
2022/09/29 00:17 upstream 49c13ed0316d e2556bc3 .config strace log report syz C ci-upstream-kasan-gce-root UBSAN: shift-out-of-bounds in dbAllocAG
2022/09/27 12:34 upstream 3800a713b607 10323ddf .config strace log report syz C ci2-upstream-fs UBSAN: shift-out-of-bounds in dbAllocAG
2022/10/30 20:34 upstream b229b6ca5abb 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbAllocAG
2022/10/30 11:03 upstream b229b6ca5abb 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbAllocAG
2022/10/26 18:55 upstream 4dc12f37a8e9 86777b7f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbAllocAG
2022/10/21 06:49 upstream 493ffd6605b2 a0fd4dab .config console log report info [disk image] [vmlinux] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbAllocAG
2022/10/15 00:09 upstream 493ffd6605b2 67cb024c .config console log report info ci2-upstream-fs UBSAN: shift-out-of-bounds in dbAllocAG
2022/10/18 13:01 linux-next 77d8bf70fac0 754863b4 .config console log report info ci-upstream-linux-next-kasan-gce-root UBSAN: shift-out-of-bounds in dbAllocAG
* Struck through repros no longer work on HEAD.