From: syzbot <syzbot+249018ea545364f78d04@syzkaller.appspotmail.com>
To: bfoster@redhat.com, kent.overstreet@linux.dev,
linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: [syzbot] [bcachefs?] UBSAN: shift-out-of-bounds in bch2_sb_dev_has_data
Date: Tue, 14 May 2024 02:33:31 -0700 [thread overview]
Message-ID: <000000000000ebf2e0061866b102@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: cf87f46fd34d Merge tag 'drm-fixes-2024-05-11' of https://g..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=162f8fbc980000
kernel config: https://syzkaller.appspot.com/x/.config?x=9d7ea7de0cb32587
dashboard link: https://syzkaller.appspot.com/bug?extid=249018ea545364f78d04
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=13a40d04980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=102e5b70980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9c147953fc8e/disk-cf87f46f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a55c9d1f91fc/vmlinux-cf87f46f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f8dab47ae8c2/bzImage-cf87f46f.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/2c5c030a256e/mount_0.gz
The issue was bisected to:
commit 03ef80b469d5d83530ce1ce15be78a40e5300f9b
Author: Kent Overstreet <kent.overstreet@linux.dev>
Date: Sat Sep 23 22:41:51 2023 +0000
bcachefs: Ignore unknown mount options
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13d673d4980000
final oops: https://syzkaller.appspot.com/x/report.txt?x=103673d4980000
console output: https://syzkaller.appspot.com/x/log.txt?x=17d673d4980000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+249018ea545364f78d04@syzkaller.appspotmail.com
Fixes: 03ef80b469d5 ("bcachefs: Ignore unknown mount options")
loop0: detected capacity change from 0 to 32768
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/bcachefs/replicas.c:1010:20
shift exponent 155 is too large for 32-bit type 'int'
CPU: 0 PID: 5075 Comm: syz-executor397 Not tainted 6.9.0-rc7-syzkaller-00183-gcf87f46fd34d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
ubsan_epilogue lib/ubsan.c:231 [inline]
__ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468
bch2_sb_dev_has_data+0x22a/0x5f0 fs/bcachefs/replicas.c:1010
member_to_text+0xcb/0x1030 fs/bcachefs/sb-members.c:163
bch2_sb_members_v1_to_text+0x1aa/0x2f0 fs/bcachefs/sb-members.c:317
bch2_sb_field_validate+0x1f7/0x2d0 fs/bcachefs/super-io.c:1228
bch2_sb_validate+0x9b6/0xe10 fs/bcachefs/super-io.c:460
__bch2_read_super+0xc9a/0x1460 fs/bcachefs/super-io.c:822
bch2_fs_open+0x246/0xdf0 fs/bcachefs/super.c:2052
bch2_mount+0x71d/0x1320 fs/bcachefs/fs.c:1903
legacy_get_tree+0xee/0x190 fs/fs_context.c:662
vfs_get_tree+0x90/0x2a0 fs/super.c:1779
do_new_mount+0x2be/0xb40 fs/namespace.c:3352
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f16b990d8ba
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:00007ffdd930ef68 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffdd930ef80 RCX: 00007f16b990d8ba
RDX: 0000000020011a00 RSI: 0000000020011a40 RDI: 00007ffdd930ef80
RBP: 0000000000000004 R08: 00007ffdd930efc0 R09: 00000000000119f3
R10: 0000000001200014 R11: 0000000000000282 R12: 0000000001200014
R13: 00007ffdd930efc0 R14: 0000000000000003 R15: 0000000001000000
</TASK>
---[ end trace ]---
---
This report is generated by a bot. It may contain errors.
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reply other threads:[~2024-05-14 9:33 UTC|newest]
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