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UBSAN: shift-out-of-bounds in dbFindCtl

Status: fixed on 2023/06/08 14:41
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+7edb85bc97be9f350d90@syzkaller.appspotmail.com
Fix commit: fad376fce0af fs/jfs: fix shift exponent db_agl2size negative
First crash: 777d, last: 631d
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: UBSAN: shift-out-of-bounds in dbFindCtl (log)
Repro: C syz .config
  
Fix bisection: fixed by (bisect log) :
commit fad376fce0af58deebc5075b8539dc05bf639af3
Author: Liu Shixin via Jfs-discussion <jfs-discussion@lists.sourceforge.net>
Date: Thu Nov 3 03:01:59 2022 +0000

  fs/jfs: fix shift exponent db_agl2size negative

  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] UBSAN: shift-out-of-bounds in dbFindCtl 1 (4) 2023/03/31 08:43
▶ ▼ Fix bisection attempts (3)
Created Duration User Patch Repo Result
2023/03/30 13:42 6h01m bisect fix upstream OK (1) job log
2023/02/28 12:45 20m bisect fix upstream OK (0) job log log
2023/01/28 13:32 43m bisect fix upstream OK (0) job log log

Sample crash report:
loop0: detected capacity change from 0 to 32768
================================================================================
UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:1671:12
shift exponent -256 is negative
CPU: 1 PID: 3610 Comm: syz-executor865 Not tainted 6.1.0-rc1-syzkaller-00093-g6d36c728bc2e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_shift_out_of_bounds+0x33d/0x3b0 lib/ubsan.c:322
 dbFindCtl+0x426/0x590 fs/jfs/jfs_dmap.c:1671
 dbAllocAny fs/jfs/jfs_dmap.c:1502 [inline]
 dbAlloc+0x31b/0xc90 fs/jfs/jfs_dmap.c:732
 extBalloc fs/jfs/jfs_extent.c:321 [inline]
 extAlloc+0x4b9/0xff0 fs/jfs/jfs_extent.c:122
 jfs_get_block+0x342/0xce0 fs/jfs/inode.c:248
 __block_write_begin_int+0x54c/0x1a80 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0x93/0x1e0 fs/buffer.c:2102
 jfs_write_begin+0x2d/0x60 fs/jfs/inode.c:304
 generic_perform_write+0x2e4/0x5e0 mm/filemap.c:3753
 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3881
 generic_file_write_iter+0xab/0x310 mm/filemap.c:3913
 do_iter_write+0x6c2/0xc20 fs/read_write.c:861
 vfs_writev fs/read_write.c:934 [inline]
 do_pwritev+0x200/0x350 fs/read_write.c:1031
 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+0x63/0xcd
RIP: 0033:0x7f093ea9cf69
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:00007ffd8725e608 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f093ea9cf69
RDX: 0000000000000002 RSI: 0000000020003380 RDI: 0000000000000003
RBP: 00007f093ea5c730 R08: 0000000002000000 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000f8008000
R13: 0000000000000000 R14: 00083878000000fc R15: 0000000000000000
 </TASK>
================================================================================

Crashes (45):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/10/21 12:12 upstream 6d36c728bc2e 63e790dd .config strace log report syz C [disk image] [vmlinux] [mounted in repro] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/10 23:59 upstream 4899a36f91a9 aea5da89 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] ci-upstream-kasan-gce-root UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/30 21:42 upstream b229b6ca5abb 2a71366b .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/21 14:32 upstream eb7081409f94 5bb70014 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/21 09:57 upstream eb7081409f94 5bb70014 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/16 23:44 upstream 59d0d52c30d4 3a127a31 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/16 11:02 upstream 81e7cfa3a9eb 3a127a31 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/16 08:11 upstream 81e7cfa3a9eb 3a127a31 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/15 17:22 upstream e01d50cbd6ee 97de9cfc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/11 18:08 upstream 4bbf3422df78 f42ee5d8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/11 03:05 upstream 1767a722a708 3ead01ad .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/09 19:13 upstream f141df371335 bebca8b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/03 16:18 upstream b229b6ca5abb 7a2ebf95 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/03 16:16 upstream b229b6ca5abb 7a2ebf95 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/02 09:20 upstream b229b6ca5abb 08977f5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/02 06:18 upstream b229b6ca5abb 08977f5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/11/01 09:48 upstream b229b6ca5abb a1d8560a .config console log report info ci-upstream-kasan-gce-root UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/31 11:28 upstream b229b6ca5abb 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/31 01:46 upstream 200204f56f3b 2a71366b .config console log report info ci-qemu-upstream UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/31 01:45 upstream b229b6ca5abb 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/31 01:44 upstream b229b6ca5abb 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/30 14:01 upstream b229b6ca5abb 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/30 14:00 upstream b229b6ca5abb 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/28 23:27 upstream b229b6ca5abb ea12ae9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/28 10:17 upstream b229b6ca5abb 5c716ff6 .config console log report info ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/27 00:49 upstream 4dc12f37a8e9 86777b7f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/26 09:25 upstream 4dc12f37a8e9 1984aebd .config console log report info ci-qemu-upstream UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/26 09:22 upstream 4dc12f37a8e9 1984aebd .config console log report info ci-upstream-kasan-gce-smack-root UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/22 13:22 upstream 4da34b7d175d c0b80a55 .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce-smack-root UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/21 19:37 upstream e35184f32151 4bfd3c27 .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce-smack-root UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/19 21:50 upstream 493ffd6605b2 b31320fc .config console log report info [disk image] [vmlinux] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/19 10:10 upstream 493ffd6605b2 b31320fc .config console log report info [disk image] [vmlinux] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/19 00:55 upstream 493ffd6605b2 b31320fc .config console log report info [disk image] [vmlinux] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/18 07:35 upstream 493ffd6605b2 94744d21 .config console log report info ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/18 06:24 upstream 493ffd6605b2 94744d21 .config console log report info ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/17 08:59 upstream 55be6084c8e0 67cb024c .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce-root UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/15 23:20 upstream 55be6084c8e0 67cb024c .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce-selinux-root UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/13 09:07 upstream 493ffd6605b2 3f6b40a1 .config console log report info [disk image] [vmlinux] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/12 11:37 upstream 493ffd6605b2 02b6492e .config console log report info [disk image] [vmlinux] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/09 18:09 upstream a6afa4199d3d aea5da89 .config console log report info [disk image] [vmlinux] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/09 15:13 upstream a6afa4199d3d aea5da89 .config console log report info [disk image] [vmlinux] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/08 19:53 upstream 62e6e5940c0c aea5da89 .config console log report info [disk image] [vmlinux] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/05 14:10 upstream 0326074ff465 267e3bb1 .config console log report info [disk image] [vmlinux] ci2-upstream-fs UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/31 01:50 upstream 200204f56f3b 2a71366b .config console log report info ci-qemu-upstream-386 UBSAN: shift-out-of-bounds in dbFindCtl
2022/10/15 23:13 linux-next aaa11ce2ffc8 67cb024c .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root UBSAN: shift-out-of-bounds in dbFindCtl
* Struck through repros no longer work on HEAD.