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

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Message-ID: <000000000000df57ee05e9978cce@google.com>
Date:   Mon, 26 Sep 2022 10:06:36 -0700
From:   syzbot <syzbot+027aa1f5f8487ba60a97@...kaller.appspotmail.com>
To:     jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        shaggy@...nel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] UBSAN: shift-out-of-bounds in jfs_open

Hello,

syzbot found the following issue on:

HEAD commit:    f76349cf4145 Linux 6.0-rc7
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17928d60880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ba0d23aa7e1ffaf5
dashboard link: https://syzkaller.appspot.com/bug?extid=027aa1f5f8487ba60a97
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+027aa1f5f8487ba60a97@...kaller.appspotmail.com

================================================================================
UBSAN: shift-out-of-bounds in fs/jfs/file.c:65:20
shift exponent 8205 is too large for 64-bit type '__u64' (aka 'unsigned long long')
CPU: 0 PID: 9735 Comm: syz-executor.4 Not tainted 6.0.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_shift_out_of_bounds+0x33d/0x3b0 lib/ubsan.c:322
 jfs_open+0x3a2/0x3d0 fs/jfs/file.c:65
 do_dentry_open+0x777/0x1180 fs/open.c:880
 do_open fs/namei.c:3557 [inline]
 path_openat+0x25fc/0x2df0 fs/namei.c:3691
 do_filp_open+0x264/0x4f0 fs/namei.c:3718
 do_sys_openat2+0x124/0x4e0 fs/open.c:1313
 do_sys_open fs/open.c:1329 [inline]
 __do_sys_open fs/open.c:1337 [inline]
 __se_sys_open fs/open.c:1333 [inline]
 __x64_sys_open+0x221/0x270 fs/open.c:1333
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5cbf28a669
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5cc0365168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f5cbf3ac120 RCX: 00007f5cbf28a669
RDX: 00000000000003ec RSI: 0000000000004042 RDI: 00000000200058c0
RBP: 00007f5cbf2e5560 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc1545e9af R14: 00007f5cc0365300 R15: 0000000000022000
 </TASK>
================================================================================


---
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