linux-kernel - Re: [syzbot] [kernfs?] [bcachefs?] UBSAN: shift-out-of-bounds in radix_tree_delete

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <67b075e0.050a0220.6f0b7.0002.GAE@google.com>
Date: Sat, 15 Feb 2025 03:09:20 -0800
From: syzbot <syzbot+b581c7106aa616bb522c@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, kent.overstreet@...ux.dev, 
	linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com, tj@...nel.org
Subject: Re: [syzbot] [kernfs?] [bcachefs?] UBSAN: shift-out-of-bounds in radix_tree_delete_item

syzbot has found a reproducer for the following issue on:

HEAD commit:    04f41cbf03ec Merge tag 'sched_ext-for-6.14-rc2-fixes' of g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=158239b0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c776e555cfbdb82d
dashboard link: https://syzkaller.appspot.com/bug?extid=b581c7106aa616bb522c
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=16b399a4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17dd4bf8580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-04f41cbf.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/04aaec67f85e/vmlinux-04f41cbf.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0b8db5fac3a6/bzImage-04f41cbf.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/402dc55a596d/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b581c7106aa616bb522c@...kaller.appspotmail.com

------------[ cut here ]------------
UBSAN: shift-out-of-bounds in lib/radix-tree.c:88:31
shift exponent 240 is too large for 64-bit type 'unsigned long'
CPU: 0 UID: 0 PID: 5331 Comm: syz-executor299 Not tainted 6.14.0-rc2-syzkaller-00228-g04f41cbf03ec #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468
 radix_tree_descend lib/radix-tree.c:88 [inline]
 __radix_tree_lookup lib/radix-tree.c:766 [inline]
 radix_tree_delete_item+0x1df/0x3f0 lib/radix-tree.c:1420
 kernfs_put+0x1ba/0x370 fs/kernfs/dir.c:575
 __kernfs_remove+0x768/0x870 fs/kernfs/dir.c:1509
 kernfs_remove+0x7a/0xa0 fs/kernfs/dir.c:1529
 __kobject_del+0xe2/0x310 lib/kobject.c:604
 kobject_del+0x45/0x60 lib/kobject.c:627
 __bch2_fs_stop+0x288/0x5c0 fs/bcachefs/super.c:641
 bch2_fs_stop+0x15/0x20 fs/bcachefs/super.c:691
 bch2_fs_get_tree+0xdee/0x17a0 fs/bcachefs/fs.c:2299
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3560
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
 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: 0033:0x7f17e484402a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 7e 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f17e3fe7fd8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f17e3fe7ff0 RCX: 00007f17e484402a
RDX: 00004000000058c0 RSI: 0000400000005900 RDI: 00007f17e3fe7ff0
RBP: 0000400000005900 R08: 00007f17e3fe8030 R09: 0000000000005931
R10: 0000000000010000 R11: 0000000000000282 R12: 00004000000058c0
R13: 00007f17e3fe8030 R14: 0000000000000003 R15: 0000000000010000
 </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.