linux-kernel - Re: [syzbot] [jfs?] KASAN: slab-use-after-free Write in dtSplitPage

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Message-ID: <6777de00.050a0220.178762.0044.GAE@google.com>
Date: Fri, 03 Jan 2025 04:54:24 -0800
From: syzbot <syzbot+a939a1121380d3212940@...kaller.appspotmail.com>
To: jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org, 
	shaggy@...nel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [jfs?] KASAN: slab-use-after-free Write in dtSplitPage

syzbot has found a reproducer for the following issue on:

HEAD commit:    0bc21e701a6f MAINTAINERS: Remove Olof from SoC maintainers
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=132bbd0f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ba7cde9482d6bb6
dashboard link: https://syzkaller.appspot.com/bug?extid=a939a1121380d3212940
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10c758b0580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17d726f8580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/858bb9b76ee5/disk-0bc21e70.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f3c83ca1ab45/vmlinux-0bc21e70.xz
kernel image: https://storage.googleapis.com/syzbot-assets/813f2115e026/bzImage-0bc21e70.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/dfe2948d3efd/mount_0.gz

Bisection is inconclusive: the first bad commit could be any of:

781773e3b680 sched/fair: Implement ENQUEUE_DELAYED
a1c446611e31 sched,freezer: Mark TASK_FROZEN special
e1459a50ba31 sched: Teach dequeue_task() about special task states
f12e148892ed sched/fair: Prepare pick_next_task() for delayed dequeue
152e11f6df29 sched/fair: Implement delayed dequeue
2e0199df252a sched/fair: Prepare exit/cleanup paths for delayed_dequeue
54a58a787791 sched/fair: Implement DELAY_ZERO

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13f5fadf980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a939a1121380d3212940@...kaller.appspotmail.com

------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:1600:11
index 22 is out of range for type 'struct lv[20]'
CPU: 1 UID: 0 PID: 5819 Comm: syz-executor559 Not tainted 6.13.0-rc5-syzkaller-00012-g0bc21e701a6f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:429
 dtSplitPage+0x3e5e/0x3ed0 fs/jfs/jfs_dtree.c:1600
 dtSplitUp fs/jfs/jfs_dtree.c:1091 [inline]
 dtInsert+0x14bd/0x6c10 fs/jfs/jfs_dtree.c:870
 jfs_rename+0xafe/0x1bf0 fs/jfs/namei.c:1225
 vfs_rename+0xbdb/0xf00 fs/namei.c:5067
 do_renameat2+0xd94/0x13f0 fs/namei.c:5224
 __do_sys_rename fs/namei.c:5271 [inline]
 __se_sys_rename fs/namei.c:5269 [inline]
 __x64_sys_rename+0x82/0x90 fs/namei.c:5269
 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: 0033:0x7f57df948b79
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 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:00007ffc55072638 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f57df948b79
RDX: 00007f57df948b79 RSI: 0000000020000f40 RDI: 0000000020000300
RBP: 00007f57df9c1610 R08: 00007ffc55072808 R09: 00007ffc55072808
R10: 00007ffc55072808 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc550727f8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
---[ end trace ]---


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.