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Date: Mon, 17 Oct 2022 17:50:47 -0400
From: Xin Long <lucien.xin@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: syzbot <syzbot+c5ce866a8d30f4be0651@...kaller.appspotmail.com>,
bpf@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
pabeni@...hat.com, syzkaller-bugs@...glegroups.com,
Jon Maloy <jmaloy@...hat.com>,
Ying Xue <ying.xue@...driver.com>,
tipc-discussion@...ts.sourceforge.net
Subject: Re: [syzbot] general protection fault in kernel_accept (5)
On Tue, Sep 27, 2022 at 10:26 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> Adding TIPC
>
> On Tue, 27 Sep 2022 01:49:38 -0700 syzbot wrote:
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit: bf682942cd26 Merge tag 'scsi-fixes' of git://git.kernel.or..
> > git tree: upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=117fc3ac880000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=7db7ad17eb14cb7
> > dashboard link: https://syzkaller.appspot.com/bug?extid=c5ce866a8d30f4be0651
> > 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+c5ce866a8d30f4be0651@...kaller.appspotmail.com
> >
> > general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
> > KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
> > CPU: 3 PID: 12841 Comm: kworker/u16:2 Not tainted 6.0.0-rc6-syzkaller-00210-gbf682942cd26 #0
> > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
> > Workqueue: tipc_rcv tipc_topsrv_accept
> > RIP: 0010:kernel_accept+0x22d/0x350 net/socket.c:3487
> > Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e3 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 20 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ee 00 00 00 48 8b 7b 08 e8 a0 36 1c fa e8 8b ff
> > RSP: 0018:ffffc9000494fc28 EFLAGS: 00010202
> > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
> > RDX: 0000000000000001 RSI: ffffffff874c37b2 RDI: 0000000000000008
> > RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000449 R12: 0000000000000000
> > R13: ffff888027a7b980 R14: ffff888028bc08e0 R15: 1ffff92000929f90
> > FS: 0000000000000000(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000
> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 00007fa6e1a8c920 CR3: 000000004bba0000 CR4: 0000000000150ee0
> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > Call Trace:
> > <TASK>
> > tipc_topsrv_accept+0x197/0x280 net/tipc/topsrv.c:460
It seems that we should free the lsock after the worker is done:
@@ -699,8 +699,8 @@ static void tipc_topsrv_stop(struct net *net)
__module_get(lsock->sk->sk_prot_creator->owner);
srv->listener = NULL;
spin_unlock_bh(&srv->idr_lock);
- sock_release(lsock);
tipc_topsrv_work_stop(srv);
+ sock_release(lsock);
idr_destroy(&srv->conn_idr);
kfree(srv);
}
> > process_one_work+0x991/0x1610 kernel/workqueue.c:2289
> > worker_thread+0x665/0x1080 kernel/workqueue.c:2436
> > kthread+0x2e4/0x3a0 kernel/kthread.c:376
> > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
> > </TASK>
> > Modules linked in:
> > ---[ end trace 0000000000000000 ]---
> > RIP: 0010:kernel_accept+0x22d/0x350 net/socket.c:3487
> > Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e3 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 20 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ee 00 00 00 48 8b 7b 08 e8 a0 36 1c fa e8 8b ff
> > RSP: 0018:ffffc9000494fc28 EFLAGS: 00010202
> > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
> > RDX: 0000000000000001 RSI: ffffffff874c37b2 RDI: 0000000000000008
> > RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000449 R12: 0000000000000000
> > R13: ffff888027a7b980 R14: ffff888028bc08e0 R15: 1ffff92000929f90
> > FS: 0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 000000c0154d8000 CR3: 000000006fb4b000 CR4: 0000000000150ee0
> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > ----------------
> > Code disassembly (best guess):
> > 0: 48 89 fa mov %rdi,%rdx
> > 3: 48 c1 ea 03 shr $0x3,%rdx
> > 7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
> > b: 0f 85 e3 00 00 00 jne 0xf4
> > 11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
> > 18: fc ff df
> > 1b: 48 8b 5b 20 mov 0x20(%rbx),%rbx
> > 1f: 48 8d 7b 08 lea 0x8(%rbx),%rdi
> > 23: 48 89 fa mov %rdi,%rdx
> > 26: 48 c1 ea 03 shr $0x3,%rdx
> > * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
> > 2e: 0f 85 ee 00 00 00 jne 0x122
> > 34: 48 8b 7b 08 mov 0x8(%rbx),%rdi
> > 38: e8 a0 36 1c fa callq 0xfa1c36dd
> > 3d: e8 .byte 0xe8
> > 3e: 8b ff mov %edi,%edi
> >
> >
> > ---
> > 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.
>
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