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

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Message-ID: <0000000000005902e205d301dd7e@google.com>
Date:   Sun, 12 Dec 2021 23:17:25 -0800
From:   syzbot <syzbot+5ad0824204c7bf9b67f2@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, christian.brauner@...ntu.com,
        gregkh@...uxfoundation.org, jack@...e.cz,
        jamorris@...ux.microsoft.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] UBSAN: shift-out-of-bounds in minix_statfs

Hello,

syzbot found the following issue on:

HEAD commit:    b8a98b6bf66a Merge tag 'pci-v5.16-fixes-2' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1342c069b00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=221ffc09e39ebbd1
dashboard link: https://syzkaller.appspot.com/bug?extid=5ad0824204c7bf9b67f2
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15e8a551b00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=176da9b9b00000

Bisection is inconclusive: the issue happens on the oldest tested release.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17e8a7bdb00000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1418a7bdb00000
console output: https://syzkaller.appspot.com/x/log.txt?x=1018a7bdb00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5ad0824204c7bf9b67f2@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 272
================================================================================
UBSAN: shift-out-of-bounds in fs/minix/inode.c:380:57
shift exponent 65510 is too large for 64-bit type 'long unsigned int'
CPU: 0 PID: 3601 Comm: syz-executor657 Not tainted 5.16.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 ubsan_epilogue+0xb/0x5a lib/ubsan.c:151
 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:330
 minix_statfs.cold+0x17/0x1c fs/minix/inode.c:380
 statfs_by_dentry+0x133/0x210 fs/statfs.c:66
 vfs_statfs fs/statfs.c:90 [inline]
 fd_statfs+0x66/0x100 fs/statfs.c:120
 __do_sys_fstatfs+0x7a/0xf0 fs/statfs.c:216
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f33e4f00e09
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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffeedacabd8 EFLAGS: 00000246 ORIG_RAX: 000000000000008a
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f33e4f00e09
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f33e4ec06a0 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffeedacaa90 R11: 0000000000000246 R12: 00007f33e4ec0730
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
================================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches