IO-Uring Archive on lore.kernel.org
 help / color / Atom feed
From: syzbot <syzbot+6b340e00888c8016e91d@syzkaller.appspotmail.com>
To: axboe@kernel.dk, io-uring@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
Subject: general protection fault in __io_uring_register
Date: Thu, 26 Dec 2019 23:13:08 -0800
Message-ID: <000000000000ca7268059aaa3987@google.com> (raw)

Hello,

syzbot found the following crash on:

HEAD commit:    7ddd09fc Add linux-next specific files for 20191220
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1295eec1e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f183b01c3088afc6
dashboard link: https://syzkaller.appspot.com/bug?extid=6b340e00888c8016e91d
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

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

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+6b340e00888c8016e91d@syzkaller.appspotmail.com

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 21080 Comm: syz-executor.2 Not tainted  
5.5.0-rc2-next-20191220-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:io_sqe_files_register fs/io_uring.c:4941 [inline]
RIP: 0010:__io_uring_register+0x555/0x2790 fs/io_uring.c:6121
Code: 3c 02 00 0f 85 7e 20 00 00 49 8b 9f 68 01 00 00 e8 e0 90 9d ff 48 8d  
7b 48 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f  
85 49 20 00 00 48 8b 95 20 ff ff ff 48 c7 43 48 00
RSP: 0018:ffffc9000491fd10 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000e02f000
RDX: 0000000000000009 RSI: ffffffff81d7c4b0 RDI: 0000000000000048
RBP: ffffc9000491fea8 R08: 1ffffffff165b7dd R09: fffffbfff165b7de
R10: fffffbfff165b7dd R11: ffffffff8b2dbeef R12: ffff88809457a600
R13: 0000000000000002 R14: 000000000000035b R15: ffff8880a76c5800
FS:  00007f6f11615700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff73a203db8 CR3: 000000009ae2a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  __do_sys_io_uring_register fs/io_uring.c:6177 [inline]
  __se_sys_io_uring_register fs/io_uring.c:6159 [inline]
  __x64_sys_io_uring_register+0x1a1/0x570 fs/io_uring.c:6159
  do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a919
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f6f11614c78 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919
RDX: 0000000020000280 RSI: 0000000000000002 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000035b R11: 0000000000000246 R12: 00007f6f116156d4
R13: 00000000004cf810 R14: 00000000004d70a0 R15: 00000000ffffffff
Modules linked in:
---[ end trace 128a762a80939ab8 ]---
RIP: 0010:io_sqe_files_register fs/io_uring.c:4941 [inline]
RIP: 0010:__io_uring_register+0x555/0x2790 fs/io_uring.c:6121
Code: 3c 02 00 0f 85 7e 20 00 00 49 8b 9f 68 01 00 00 e8 e0 90 9d ff 48 8d  
7b 48 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f  
85 49 20 00 00 48 8b 95 20 ff ff ff 48 c7 43 48 00
RSP: 0018:ffffc9000491fd10 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000e02f000
RDX: 0000000000000009 RSI: ffffffff81d7c4b0 RDI: 0000000000000048
RBP: ffffc9000491fea8 R08: 1ffffffff165b7dd R09: fffffbfff165b7de
R10: fffffbfff165b7dd R11: ffffffff8b2dbeef R12: ffff88809457a600
R13: 0000000000000002 R14: 000000000000035b R15: ffff8880a76c5800
FS:  00007f6f11615700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff73a203db8 CR3: 000000009ae2a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug 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@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

                 reply index

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=000000000000ca7268059aaa3987@google.com \
    --to=syzbot+6b340e00888c8016e91d@syzkaller.appspotmail.com \
    --cc=axboe@kernel.dk \
    --cc=io-uring@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=syzkaller-bugs@googlegroups.com \
    --cc=viro@zeniv.linux.org.uk \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

IO-Uring Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/io-uring/0 io-uring/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 io-uring io-uring/ https://lore.kernel.org/io-uring \
		io-uring@vger.kernel.org
	public-inbox-index io-uring

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.io-uring


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git