linux-kernel - [syzbot] [bcachefs?] UBSAN: shift-out-of-bounds in member_to

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Message-ID: <00000000000005e6c90621278371@google.com>
Date: Mon, 02 Sep 2024 11:57:25 -0700
From: syzbot <syzbot+064ce437a1ad63d3f6ef@...kaller.appspotmail.com>
To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [bcachefs?] UBSAN: shift-out-of-bounds in member_to_text

Hello,

syzbot found the following issue on:

HEAD commit:    431c1646e1f8 Linux 6.11-rc6
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1433084d980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=660f6eb11f9c7dc5
dashboard link: https://syzkaller.appspot.com/bug?extid=064ce437a1ad63d3f6ef
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=160ccf2b980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13dbab2b980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-431c1646.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e5b61d9e315e/vmlinux-431c1646.xz
kernel image: https://storage.googleapis.com/syzbot-assets/149431616278/bzImage-431c1646.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/814c5affc830/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+064ce437a1ad63d3f6ef@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/bcachefs/sb-members.c:249:2
shift exponent 69 is too large for 64-bit type 'unsigned long long'
CPU: 0 UID: 0 PID: 5099 Comm: syz-executor454 Not tainted 6.11.0-rc6-syzkaller #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:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468
 member_to_text+0x9a2/0x9b0 fs/bcachefs/sb-members.c:249
 bch2_sb_members_v2_to_text+0x267/0x3b0 fs/bcachefs/sb-members.c:310
 bch2_sb_field_validate+0x201/0x2e0 fs/bcachefs/super-io.c:1233
 bch2_sb_validate+0xb4b/0xef0 fs/bcachefs/super-io.c:472
 __bch2_read_super+0xc1b/0x1370 fs/bcachefs/super-io.c:827
 bch2_fs_open+0x246/0xdf0 fs/bcachefs/super.c:2083
 bch2_fs_get_tree+0x731/0x1700 fs/bcachefs/fs.c:1933
 vfs_get_tree+0x90/0x2b0 fs/super.c:1800
 do_new_mount+0x2be/0xb40 fs/namespace.c:3472
 do_mount fs/namespace.c:3812 [inline]
 __do_sys_mount fs/namespace.c:4020 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997
 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: 0033:0x7fe3ee4d7faa
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe262fa7b8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe262fa7d0 RCX: 00007fe3ee4d7faa
RDX: 00000000200058c0 RSI: 0000000020000100 RDI: 00007ffe262fa7d0
RBP: 0000000000000004 R08: 00007ffe262fa810 R09: 0000000000005903
R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000000000
R13: 00007ffe262fa810 R14: 0000000000000003 R15: 0000000001000000
 </TASK>
---[ end trace ]---


---
This report is generated by a bot. It may contain errors.
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