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UBSAN: shift-out-of-bounds in dbFindCtl

Status: upstream: reported C repro on 2022/10/09 14:15
Subsystems: jfs (incorrect?)
Reported-by: syzbot+7edb85bc97be9f350d90@syzkaller.appspotmail.com
First crash: 171d, last: 26d

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

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: 3601 Comm: syz-executor344 Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #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+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
 dbFindCtl.cold+0x52/0x57 fs/jfs/jfs_dmap.c:1671
 dbAllocAny+0xa4/0x1a0 fs/jfs/jfs_dmap.c:1502
 dbAlloc+0x46d/0xa70 fs/jfs/jfs_dmap.c:859
 extBalloc fs/jfs/jfs_extent.c:321 [inline]
 extAlloc+0x4e7/0xeb0 fs/jfs/jfs_extent.c:122
 jfs_get_block+0x661/0xa90 fs/jfs/inode.c:248
 __block_write_begin_int+0x3b9/0x14b0 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0xb5/0x4d0 fs/buffer.c:2102
 jfs_write_begin+0x2d/0xd0 fs/jfs/inode.c:304
 generic_perform_write+0x252/0x570 mm/filemap.c:3753
 __generic_file_write_iter+0x2aa/0x4d0 mm/filemap.c:3881
 generic_file_write_iter+0xdf/0x350 mm/filemap.c:3913
 call_write_iter include/linux/fs.h:2191 [inline]
 do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735
 do_iter_write+0x182/0x700 fs/read_write.c:861
 vfs_writev+0x1aa/0x630 fs/read_write.c:934
 do_pwritev+0x1b6/0x270 fs/read_write.c:1031
 __do_sys_pwritev2 fs/read_write.c:1090 [inline]
 __se_sys_pwritev2 fs/read_write.c:1081 [inline]
 __x64_sys_pwritev2+0xeb/0x150 fs/read_write.c:1081
 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: 0033:0x7f63af545f69
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:00007fff5e1d1228 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f63af545f69
RDX: 0000000000000002 RSI: 0000000020003380 RDI: 0000000000000003
RBP: 00007f63af505730 R08: 0000000002000000 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000f8008000
R13: 0000000000000000 R14: 00083878000000fc R15: 0000000000000000
 </TASK>
================================================================================

Fix bisection attempts:
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-kasan-gce-root 2023/02/28 13:05 upstream ae3419fbac84 2a71366b .config console log report syz C
ci2-upstream-fs 2023/01/28 14:15 upstream 5af6ce704936 63e790dd .config console log report syz C
* Struck through repros no longer work on HEAD.
Crashes (45):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-kasan-gce-root 2022/10/30 21:42 upstream b229b6ca5abb 2a71366b .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/21 12:12 upstream 6d36c728bc2e 63e790dd .config strace log report syz C [disk image] [vmlinux] [mounted in repro] UBSAN: shift-out-of-bounds in dbFindCtl
ci-upstream-kasan-gce-root 2022/10/10 23:59 upstream 4899a36f91a9 aea5da89 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/11/21 14:32 upstream eb7081409f94 5bb70014 .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/11/21 09:57 upstream eb7081409f94 5bb70014 .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/11/16 23:44 upstream 59d0d52c30d4 3a127a31 .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/11/16 11:02 upstream 81e7cfa3a9eb 3a127a31 .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/11/16 08:11 upstream 81e7cfa3a9eb 3a127a31 .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/11/15 17:22 upstream e01d50cbd6ee 97de9cfc .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/11/11 18:08 upstream 4bbf3422df78 f42ee5d8 .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/11/11 03:05 upstream 1767a722a708 3ead01ad .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/11/09 19:13 upstream f141df371335 bebca8b7 .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/11/03 16:18 upstream b229b6ca5abb 7a2ebf95 .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/11/03 16:16 upstream b229b6ca5abb 7a2ebf95 .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/11/02 09:20 upstream b229b6ca5abb 08977f5d .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/11/02 06:18 upstream b229b6ca5abb 08977f5d .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci-upstream-kasan-gce-root 2022/11/01 09:48 upstream b229b6ca5abb a1d8560a .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/31 11:28 upstream b229b6ca5abb 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci-qemu-upstream 2022/10/31 01:46 upstream 200204f56f3b 2a71366b .config console log report info UBSAN: shift-out-of-bounds in dbFindCtl
ci-upstream-kasan-gce-smack-root 2022/10/31 01:45 upstream b229b6ca5abb 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci-upstream-kasan-gce-selinux-root 2022/10/31 01:44 upstream b229b6ca5abb 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/30 14:01 upstream b229b6ca5abb 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/30 14:00 upstream b229b6ca5abb 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci-upstream-kasan-gce-root 2022/10/28 23:27 upstream b229b6ca5abb ea12ae9b .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/28 10:17 upstream b229b6ca5abb 5c716ff6 .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/27 00:49 upstream 4dc12f37a8e9 86777b7f .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci-qemu-upstream 2022/10/26 09:25 upstream 4dc12f37a8e9 1984aebd .config console log report info UBSAN: shift-out-of-bounds in dbFindCtl
ci-upstream-kasan-gce-smack-root 2022/10/26 09:22 upstream 4dc12f37a8e9 1984aebd .config console log report info [disk image] [vmlinux] [kernel image] UBSAN: shift-out-of-bounds in dbFindCtl
ci-upstream-kasan-gce-smack-root 2022/10/22 13:22 upstream 4da34b7d175d c0b80a55 .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci-upstream-kasan-gce-smack-root 2022/10/21 19:37 upstream e35184f32151 4bfd3c27 .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/19 21:50 upstream 493ffd6605b2 b31320fc .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/19 10:10 upstream 493ffd6605b2 b31320fc .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/19 00:55 upstream 493ffd6605b2 b31320fc .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/18 07:35 upstream 493ffd6605b2 94744d21 .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/18 06:24 upstream 493ffd6605b2 94744d21 .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci-upstream-kasan-gce-root 2022/10/17 08:59 upstream 55be6084c8e0 67cb024c .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci-upstream-kasan-gce-selinux-root 2022/10/15 23:20 upstream 55be6084c8e0 67cb024c .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/13 09:07 upstream 493ffd6605b2 3f6b40a1 .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/12 11:37 upstream 493ffd6605b2 02b6492e .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/09 18:09 upstream a6afa4199d3d aea5da89 .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/09 15:13 upstream a6afa4199d3d aea5da89 .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/08 19:53 upstream 62e6e5940c0c aea5da89 .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci2-upstream-fs 2022/10/05 14:10 upstream 0326074ff465 267e3bb1 .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
ci-qemu-upstream-386 2022/10/31 01:50 upstream 200204f56f3b 2a71366b .config console log report info UBSAN: shift-out-of-bounds in dbFindCtl
ci-upstream-linux-next-kasan-gce-root 2022/10/15 23:13 linux-next aaa11ce2ffc8 67cb024c .config console log report info [disk image] [vmlinux] UBSAN: shift-out-of-bounds in dbFindCtl
* Struck through repros no longer work on HEAD.