linux-kernel - [syzbot] UBSAN: array-index-out-of-bounds in io_submit

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Message-ID: <000000000000f0b26205e04a183b@google.com>
Date:   Tue, 31 May 2022 00:55:34 -0700
From:   syzbot <syzbot+b6c9b65b6753d333d833@...kaller.appspotmail.com>
To:     asml.silence@...il.com, axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] UBSAN: array-index-out-of-bounds in io_submit_sqes

Hello,

syzbot found the following issue on:

HEAD commit:    3b46e4e44180 Add linux-next specific files for 20220531
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16e151f5f00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ccb8d66fc9489ef
dashboard link: https://syzkaller.appspot.com/bug?extid=b6c9b65b6753d333d833
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, 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+b6c9b65b6753d333d833@...kaller.appspotmail.com

================================================================================
================================================================================
UBSAN: array-index-out-of-bounds in fs/io_uring.c:8860:19
index 75 is out of range for type 'io_op_def [47]'
CPU: 0 PID: 10377 Comm: syz-executor.4 Not tainted 5.18.0-next-20220531-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/0x50 lib/ubsan.c:151
 __ubsan_handle_out_of_bounds.cold+0x62/0x6c lib/ubsan.c:283
 io_init_req fs/io_uring.c:8860 [inline]
 io_submit_sqe fs/io_uring.c:8987 [inline]
 io_submit_sqes+0x6f0e/0x8020 fs/io_uring.c:9143
 __do_sys_io_uring_enter+0x1112/0x2300 fs/io_uring.c:12077
 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+0x46/0xb0
RIP: 0033:0x7fd28ac89109
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:00007fd28be25168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007fd28ad9bf60 RCX: 00007fd28ac89109
RDX: 0000000000000000 RSI: 00000000000001b9 RDI: 0000000000000003
RBP: 00007fd28ace308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe7683a70f R14: 00007fd28be25300 R15: 0000000000022000
 </TASK>
================================================================================


---
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