UBSAN: array-index-out-of-bounds in dbSplit

Status: fixed on 2024/11/18 23:34
Reported-by: syzbot+15fabea3f21e03099ab1@syzkaller.appspotmail.com
Fix commit: 25d2a3ff02f2 jfs: check if leafidx greater than num leaves per dmap tree
First crash: 660d, last: 648d
Fix bisection: fixed by (bisect log) :
commit 25d2a3ff02f22e215ce53355619df10cc5faa7ab
Author: Edward Adam Davis <eadavis@qq.com>
Date: Sat Aug 24 01:25:23 2024 +0000

  jfs: check if leafidx greater than num leaves per dmap tree

  
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2024/10/15 upstream (ToT) eca631b8fe80 C Failed due to an error; will retry later
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 UBSAN: array-index-out-of-bounds in dbSplit 15 5 656d 656d 0/3 auto-obsoleted due to no activity on 2025/01/15 20:16
upstream UBSAN: array-index-out-of-bounds in dbSplit jfs 15 C inconclusive 31 682d 730d 28/29 fixed on 2024/10/22 11:57
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/10/29 09:44 36m retest repro linux-5.15.y OK log

Sample crash report:
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:2696:27
index 4294967295 is out of range for type 's8[1365]' (aka 'signed char[1365]')
CPU: 0 PID: 3832 Comm: syz.4.18 Not tainted 5.15.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_out_of_bounds+0x118/0x140 lib/ubsan.c:282
 dbSplit+0x1fd/0x220 fs/jfs/jfs_dmap.c:2696
 dbAllocBits+0x4e5/0x9a0 fs/jfs/jfs_dmap.c:2259
 dbAllocDmap fs/jfs/jfs_dmap.c:2100 [inline]
 dbAllocDmapLev+0x24c/0x490 fs/jfs/jfs_dmap.c:2054
 dbAllocCtl+0x113/0x920 fs/jfs/jfs_dmap.c:1891
 dbAllocAG+0x28b/0x10b0 fs/jfs/jfs_dmap.c:1432
 dbDiscardAG+0x34e/0xa10 fs/jfs/jfs_dmap.c:1681
 jfs_ioc_trim+0x42f/0x660 fs/jfs/jfs_discard.c:100
 jfs_ioctl+0x2ac/0x3a0 fs/jfs/ioctl.c:132
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f08e1a91ff9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f08dfee9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f08e1c4a058 RCX: 00007f08e1a91ff9
RDX: 0000000020000080 RSI: 00000000c0185879 RDI: 0000000000000004
RBP: 00007f08e1b04296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f08e1c4a058 R15: 00007ffee0cc4388
 </TASK>
================================================================================

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/15 06:56 linux-5.15.y 3a5928702e71 b01b6661 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dbSplit
2024/10/15 06:54 linux-5.15.y 3a5928702e71 b01b6661 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dbSplit
2024/10/07 05:09 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dbSplit
2024/10/07 03:30 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dbSplit
2024/10/07 03:12 linux-5.15.y 3a5928702e71 d7906eff .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dbSplit
2024/10/07 02:26 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dbSplit
2024/10/07 02:25 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dbSplit
2024/10/03 12:38 linux-5.15.y 3a5928702e71 a4c7fd36 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dbSplit
2024/10/03 12:38 linux-5.15.y 3a5928702e71 a4c7fd36 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dbSplit
* Struck through repros no longer work on HEAD.