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Message-ID: <CADvbK_dx=dT6j-XMA=p9QgJJp5YgA2zRCLuY08u4pz0v=vXorw@mail.gmail.com>
Date: Thu, 31 Oct 2019 17:14:15 +0800
From: Xin Long <lucien.xin@...il.com>
To: "Rantala, Tommi T. (Nokia - FI/Espoo)" <tommi.t.rantala@...ia.com>
Cc: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"stable@...r.kernel.org" <stable@...r.kernel.org>,
"davem@...emloft.net" <davem@...emloft.net>,
"syzbot+d44f7bbebdea49dbc84a@...kaller.appspotmail.com"
<syzbot+d44f7bbebdea49dbc84a@...kaller.appspotmail.com>,
"marcelo.leitner@...il.com" <marcelo.leitner@...il.com>
Subject: Re: [PATCH 4.14 024/119] sctp: change sctp_prot .no_autobind with true
On Thu, Oct 31, 2019 at 3:54 PM Rantala, Tommi T. (Nokia - FI/Espoo)
<tommi.t.rantala@...ia.com> wrote:
>
> On Sun, 2019-10-27 at 22:00 +0100, Greg Kroah-Hartman wrote:
> > From: Xin Long <lucien.xin@...il.com>
> >
> > [ Upstream commit 63dfb7938b13fa2c2fbcb45f34d065769eb09414 ]
> >
> > syzbot reported a memory leak:
> >
> > BUG: memory leak, unreferenced object 0xffff888120b3d380 (size 64):
> > backtrace:
> >
> > [...] slab_alloc mm/slab.c:3319 [inline]
> > [...] kmem_cache_alloc+0x13f/0x2c0 mm/slab.c:3483
> > [...] sctp_bucket_create net/sctp/socket.c:8523 [inline]
> > [...] sctp_get_port_local+0x189/0x5a0 net/sctp/socket.c:8270
> > [...] sctp_do_bind+0xcc/0x200 net/sctp/socket.c:402
> > [...] sctp_bindx_add+0x4b/0xd0 net/sctp/socket.c:497
> > [...] sctp_setsockopt_bindx+0x156/0x1b0 net/sctp/socket.c:1022
> > [...] sctp_setsockopt net/sctp/socket.c:4641 [inline]
> > [...] sctp_setsockopt+0xaea/0x2dc0 net/sctp/socket.c:4611
> > [...] sock_common_setsockopt+0x38/0x50 net/core/sock.c:3147
> > [...] __sys_setsockopt+0x10f/0x220 net/socket.c:2084
> > [...] __do_sys_setsockopt net/socket.c:2100 [inline]
> >
> > It was caused by when sending msgs without binding a port, in the path:
> > inet_sendmsg() -> inet_send_prepare() -> inet_autobind() ->
> > .get_port/sctp_get_port(), sp->bind_hash will be set while bp->port is
> > not. Later when binding another port by sctp_setsockopt_bindx(), a new
> > bucket will be created as bp->port is not set.
> >
> > sctp's autobind is supposed to call sctp_autobind() where it does all
> > things including setting bp->port. Since sctp_autobind() is called in
> > sctp_sendmsg() if the sk is not yet bound, it should have skipped the
> > auto bind.
> >
> > THis patch is to avoid calling inet_autobind() in inet_send_prepare()
> > by changing sctp_prot .no_autobind with true, also remove the unused
> > .get_port.
>
> Hi,
>
> I'm seeing SCTP oops in 4.14.151, reproducible easily with iperf:
>
> # iperf3 -s -1 &
> # iperf3 -c localhost --sctp
>
> This patch was also included in 4.19.81, but there it seems to be working
> fine.
>
> Any ideas if this patch is valid for 4.14, or what's missing in 4.14 to
> make this work?
pls get this commit into 4.14, which has been in 4.19:
commit 644fbdeacf1d3edd366e44b8ba214de9d1dd66a9
Author: Xin Long <lucien.xin@...il.com>
Date: Sun May 20 16:39:10 2018 +0800
sctp: fix the issue that flags are ignored when using kernel_connect
>
>
> [ 29.179116] sctp: Hash tables configured (bind 256/256)
> [ 29.188846] BUG: unable to handle kernel NULL pointer dereference
> at (null)
> [ 29.190189] IP: (null)
> [ 29.190758] PGD 0 P4D 0
> [ 29.191224] Oops: 0010 [#1] SMP PTI
> [ 29.191786] Modules linked in: hmac sctp libcrc32c isofs kvm_intel kvm
> irqbypass sch_fq_codel pcbc aesni_intel aes_x86_64 crypto_simd cryptd
> glue_helper ata_piix dm_mirror dm_region_hash dm_log dm_mod dax autofs4
> [ 29.194585] CPU: 5 PID: 733 Comm: iperf3 Not tainted 4.14.151-1.x86_64
> #1
> [ 29.195689] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 1.12.0-2.fc30 04/01/2014
> [ 29.197009] task: ffff93edb0e65bc0 task.stack: ffff9fcdc11b8000
> [ 29.197916] RIP: 0010: (null)
> [ 29.198532] RSP: 0018:ffff9fcdc11bbe50 EFLAGS: 00010246
> [ 29.199349] RAX: 0000000000000000 RBX: ffff93edb02d0680 RCX:
> 0000000000000002
> [ 29.200426] RDX: 0000000000000001 RSI: 0000000000000000 RDI:
> ffff93edb02d0680
> [ 29.201497] RBP: 000000000000001c R08: 0100000000000000 R09:
> 0000564277abb4e8
> [ 29.202577] R10: 0000000000000000 R11: 0000000000000000 R12:
> ffff9fcdc11bbe90
> [ 29.203656] R13: 0000564277abb4e0 R14: 0000000000000000 R15:
> 0000000000000000
> [ 29.204737] FS: 00007f0f6242cb80(0000) GS:ffff93edbfd40000(0000)
> knlGS:0000000000000000
> [ 29.205967] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 29.206863] CR2: 0000000000000000 CR3: 000000023037c002 CR4:
> 00000000003606e0
> [ 29.207958] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [ 29.209079] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
> [ 29.210162] Call Trace:
> [ 29.210577] inet_autobind+0x2c/0x60
> [ 29.211172] inet_dgram_connect+0x45/0x80
> [ 29.211808] SYSC_connect+0x89/0xb0
> [ 29.212384] ? sock_map_fd+0x3d/0x60
> [ 29.212960] do_syscall_64+0x74/0x190
> [ 29.213517] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
> [ 29.214212] RIP: 0033:0x7f0f626b5758
> [ 29.214710] RSP: 002b:00007ffc7ca624f8 EFLAGS: 00000246 ORIG_RAX:
> 000000000000002a
> [ 29.215727] RAX: ffffffffffffffda RBX: 0000564277aba260 RCX:
> 00007f0f626b5758
> [ 29.216660] RDX: 000000000000001c RSI: 0000564277abb4e0 RDI:
> 0000000000000005
> [ 29.217613] RBP: 0000000000000005 R08: 0000564277abc9d0 R09:
> 0000564277abb4e8
> [ 29.218604] R10: 0000000000000000 R11: 0000000000000246 R12:
> 00007f0f627a7170
> [ 29.219606] R13: 00007ffc7ca62520 R14: 0000564277aba260 R15:
> 0000000000000001
> [ 29.220596] Code: Bad RIP value.
> [ 29.221075] RIP: (null) RSP: ffff9fcdc11bbe50
> [ 29.221772] CR2: 0000000000000000
> [ 29.222260] ---[ end trace 831c4c1f11109ca0 ]---
>
>
> > Reported-by: syzbot+d44f7bbebdea49dbc84a@...kaller.appspotmail.com
> > Signed-off-by: Xin Long <lucien.xin@...il.com>
> > Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> > Signed-off-by: David S. Miller <davem@...emloft.net>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > ---
> > net/sctp/socket.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > --- a/net/sctp/socket.c
> > +++ b/net/sctp/socket.c
> > @@ -8313,7 +8313,7 @@ struct proto sctp_prot = {
> > .backlog_rcv = sctp_backlog_rcv,
> > .hash = sctp_hash,
> > .unhash = sctp_unhash,
> > - .get_port = sctp_get_port,
> > + .no_autobind = true,
> > .obj_size = sizeof(struct sctp_sock),
> > .sysctl_mem = sysctl_sctp_mem,
> > .sysctl_rmem = sysctl_sctp_rmem,
> > @@ -8352,7 +8352,7 @@ struct proto sctpv6_prot = {
> > .backlog_rcv = sctp_backlog_rcv,
> > .hash = sctp_hash,
> > .unhash = sctp_unhash,
> > - .get_port = sctp_get_port,
> > + .no_autobind = true,
> > .obj_size = sizeof(struct sctp6_sock),
> > .sysctl_mem = sysctl_sctp_mem,
> > .sysctl_rmem = sysctl_sctp_rmem,
> >
> >
>
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