linux-kernel - [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbFree

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Message-ID: <000000000000aec88d05f759ef57@google.com>
Date:   Mon, 20 Mar 2023 12:28:48 -0700
From:   syzbot <syzbot+d2cd27dcf8e04b232eb2@...kaller.appspotmail.com>
To:     jfs-discussion@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        shaggy@...nel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbFree

Hello,

syzbot found the following issue on:

HEAD commit:    0ddc84d2dd43 Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=17f30826c80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dbab9019ad6fc418
dashboard link: https://syzkaller.appspot.com/bug?extid=d2cd27dcf8e04b232eb2
compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1211504ac80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1447df1ac80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f1aef650a28e/disk-0ddc84d2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ab9d7540bffe/vmlinux-0ddc84d2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cf0758e28298/bzImage-0ddc84d2.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/bd86262b7da2/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d2cd27dcf8e04b232eb2@...kaller.appspotmail.com

         option from the mount to silence this warning.
=======================================================
find_entry called with index = 0
read_mapping_page failed!
ERROR: (device loop0): txCommit: 
ERROR: (device loop0): remounting filesystem as read-only
================================================================================
UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:381:12
shift exponent 134217736 is too large for 64-bit type 'long long'
CPU: 1 PID: 5068 Comm: syz-executor350 Not tainted 6.3.0-rc2-syzkaller-00069-g0ddc84d2dd43 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3c3/0x420 lib/ubsan.c:387
 dbFree+0x46e/0x650 fs/jfs/jfs_dmap.c:381
 txFreeMap+0x96a/0xd50 fs/jfs/jfs_txnmgr.c:2510
 xtTruncate+0xe5c/0x3260 fs/jfs/jfs_xtree.c:2467
 jfs_free_zero_link+0x46e/0x6e0 fs/jfs/namei.c:758
 jfs_evict_inode+0x35f/0x440 fs/jfs/inode.c:153
 evict+0x2a4/0x620 fs/inode.c:665
 __dentry_kill+0x436/0x650 fs/dcache.c:607
 shrink_dentry_list+0x39c/0x6a0 fs/dcache.c:1201
 shrink_dcache_parent+0xcd/0x480
 do_one_tree+0x23/0xe0 fs/dcache.c:1682
 shrink_dcache_for_umount+0x7d/0x120 fs/dcache.c:1699
 generic_shutdown_super+0x67/0x340 fs/super.c:472
 kill_block_super+0x7e/0xe0 fs/super.c:1398
 deactivate_locked_super+0xa4/0x110 fs/super.c:331
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1177
 task_work_run+0x24a/0x300 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0x68f/0x2290 kernel/exit.c:869
 do_group_exit+0x206/0x2c0 kernel/exit.c:1019
 __do_sys_exit_group kernel/exit.c:1030 [inline]
 __se_sys_exit_group kernel/exit.c:1028 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1028
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa87e2289b9
Code: Unable to access opcode bytes at 0x7fa87e22898f.
RSP: 002b:00007fff4bfe3938 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fa87e2a3330 RCX: 00007fa87e2289b9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007fa87e29de40
R10: 00007fff4bfe3850 R11: 0000000000000246 R12: 00007fa87e2a3330
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
 </TASK>
================================================================================


---
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