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Message-Id: <BC54C211-FD19-4105-833C-BB3B297B9BD5@chopps.org>
Date: Mon, 17 Jun 2024 11:17:08 -0400
From: Christian Hopps <chopps@...pps.org>
To: Antony Antony <antony@...nome.org>
Cc: devel@...ux-ipsec.org,
Steffen Klassert <steffen.klassert@...unet.com>,
netdev@...r.kernel.org,
Christian Hopps <chopps@...n.net>
Subject: Re: [devel-ipsec] [PATCH ipsec-next v2 0/17] Add IP-TFS mode to xfrm
Very sorry, it appears that when I did git history cleanup, the fix for the dont-frag toobig case was removed. I will get the fix restored and new patch posted.
Thanks,
Chris.
> On Jun 11, 2024, at 2:24 AM, Antony Antony via Devel <devel@...ux-ipsec.org> wrote:
>
> On Sat, May 25, 2024 at 01:55:01AM -0400, Christian Hopps via Devel wrote:
>>
>> Found. This was happening b/c the skb was locally generated on the gateway and so had no net_device. Fixed by checking for skb->dev == NULL before incrementing the error stats in the output path.
>>
>> Thanks!
>> Chris.
>
> I tried v3 quickly and I still see kernel oops on misconfigurations. Did you
> test with IP-TFS DF enabled? I understand IP-TFS DF is a misconfiguration.
> However, it should not casue a null-ptr-deref.
>
> I suspect there is another misconfiguration that is cuasing null-ptr-deref.
> sysctl -w net.core.xfrm_iptfs_maxqsize=0
>
> I will try later this week to get to you crash message.
>
> -antony
>
>>
>> Christian Hopps <chopps@...pps.org> writes:
>>
>>> [[PGP Signed Part:Good signature from 2E1D830ED7B83025 Christian Hopps <chopps@...il.com> (trust ultimate) created at 2024-05-24T08:08:58-0400 using RSA]]
>>>
>>> This is very helpful thanks.
>>>
>>> I think the tunnel endpoints are east/west 192.1.2.{23,45}, but I can't determine the north/east endpoints b/c they don't appear connected. :)
>>>
>>> Are there any other iptfs options? The code you highlight mentions the `dont-frag` option, but I wonder if you actually have that enabled?
>>>
>>> It also seems like you are pinging and forcing the source IP of a red interface
>>> on the tunnel endpoint gateway directly (so that it doesn't try and use the
>>> black interface I would guess) is that correct?
>>>
>>> Thanks!
>>> Chris.
>>>
>>> P.S. the addresses on the NIC host in the picture seem reversed, but this doesn't seem relevant to this test :)
>>>
>>> Antony Antony <antony@...nome.org> writes:
>>>
>>>> On Thu, May 23, 2024 at 07:04:58PM -0400, Christian Hopps wrote:
>>>>>
>>>>> Could you let me know some more details about this test? What is your interface config / topology?. I tried to guess given the ping command but it's not replicating for me.
>>>>
>>>> I am using Libreswan testing topology. However, I am running test manually.
>>>> Yesterday tunnel between north and east. This morning I quickly tried
>>>> between west-east. Just two VM. I see the same issue there too.
>>>>
>>>> https://libreswan.org/wiki/images/f/f1/Testnet-202102.png
>>>>
>>>> I am using CONFIG_ESP_OFFLOAD. That is only thing standing out. Besides it
>>>> is just a 1500 MTU tunnels using qemu/kvm and tap network.
>>>>
>>>> attached is my kernel .config
>>>>
>>>>> PS, I've changed the subject and In-reply-to to be based on the corrected
>>>>> cover-letter I sent, I initially sent the cover letter with the wrong
>>>>> subject. :(
>>>>
>>>> I noticed a second cover letter. However, it was not showing as related to
>>>> patch set correctly. It showed up as a diffrent thread. That is why I
>>>> replied to the initial one
>>>>
>>>> -antony
>>>>>
>>>>>
>>>>> Antony Antony <antony@...nome.org> writes:
>>>>>
>>>>>> Hi Chris,
>>>>>>
>>>>>> On Mon, May 20, 2024 at 05:42:38PM -0400, Christian Hopps via Devel wrote:
>>>>>>> From: Christian Hopps <chopps@...n.net>
>>>>>>> - iptfs: remove some BUG_ON() assertions questioned in review.
>>>>>
>>>>> ...
>>>>>
>>>>>> I ran a couple of tests and it hit KSAN BUG.
>>>>>>
>>>>>> I was sending large ping while MTU is 1500.
>>>>>>
>>>>>> north login: shed systemd-user-sessions.service - Permit User Sessions.
>>>>>> north login: [ 78.594770] ==================================================================
>>>>>> [ 78.595825] BUG: KASAN: null-ptr-deref in iptfs_output_collect+0x263/0x57b
>>>>>> [ 78.596658] Read of size 8 at addr 0000000000000108 by task ping/493
>>>>>> [ 78.597435] ng rpc-statd-notify.service - Notify NFS peers of a restart...
>>>>>> [ 78.597651] CPU: 0 PID: 493 Comm: ping Not tainted 6.9.0-rc2-00697-g489ca863e24f-dirty #11
>>>>>> [ 78.598645] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
>>>>>> [ 78.599747] Call Trace:tty@...S2.service - Serial Getty on ttyS2.
>>>>>> [ 78.600070] <TASK>l-getty@...S3.service - Serial Getty on ttyS3.
>>>>>> [ 78.600354] dump_stack_lvl+0x2a/0x3bogin Prompts.
>>>>>> [ 78.600817] kasan_report+0x84/0xa6rvice - Hostname Service...
>>>>>> [ 78.601262] ? iptfs_output_collect+0x263/0x57bl server.
>>>>>> [ 78.601825] iptfs_output_collect+0x263/0x57bogin Management.
>>>>>> [ 78.602374] ip_send_skb+0x25/0x57vice - Notify NFS peers of a restart.
>>>>>> [ 78.602807] raw_sendmsg+0xee8/0x1011t - Multi-User System.
>>>>>> [ 78.603269] ? native_flush_tlb_one_user+0xd/0xe5e Service.
>>>>>> [ 78.603850] ? raw_hash_sk+0x21b/0x21b
>>>>>> [ 78.604331] ? kernel_init_pages+0x42/0x51
>>>>>> [ 78.604845] ? prep_new_page+0x44/0x51Re…line ext4 Metadata Check Snapshots.
>>>>>> [ 78.605318] ? get_page_from_freelist+0x72b/0x915 Interface.
>>>>>> [ 78.605903] ? signal_pending_state+0x77/0x77cord Runlevel Change in UTMP...
>>>>>> [ 78.606462] ? __might_resched+0x8a/0x240e - Record Runlevel Change in UTMP.
>>>>>> [ 78.606966] ? __might_sleep+0x25/0xa0
>>>>>> [ 78.607440] ? first_zones_zonelist+0x2c/0x43
>>>>>> [ 78.607985] ? __rcu_read_lock+0x2d/0x3a
>>>>>> [ 78.608479] ? __pte_offset_map+0x32/0xa4
>>>>>> [ 78.608979] ? __might_resched+0x8a/0x240
>>>>>> [ 78.609478] ? __might_sleep+0x25/0xa0
>>>>>> [ 78.609949] ? inet_send_prepare+0x54/0x54
>>>>>> [ 78.610464] ? sock_sendmsg_nosec+0x42/0x6c
>>>>>> [ 78.610984] sock_sendmsg_nosec+0x42/0x6c
>>>>>> [ 78.611485] __sys_sendto+0x15d/0x1cc
>>>>>> [ 78.611947] ? __x64_sys_getpeername+0x44/0x44
>>>>>> [ 78.612498] ? __handle_mm_fault+0x679/0xae4
>>>>>> [ 78.613033] ? find_vma+0x6b/0x8b
>>>>>> [ 78.613457] ? find_vma_intersection+0x8a/0x8a
>>>>>> [ 78.614006] ? __handle_irq_event_percpu+0x180/0x197
>>>>>> [ 78.614617] ? handle_mm_fault+0x38/0x154
>>>>>> [ 78.615114] ? handle_mm_fault+0xeb/0x154
>>>>>> [ 78.615620] ? preempt_latency_start+0x29/0x34
>>>>>> [ 78.616169] ? preempt_count_sub+0x14/0xb3
>>>>>> [ 78.616678] ? up_read+0x4b/0x5c
>>>>>> [ 78.617094] __x64_sys_sendto+0x76/0x82
>>>>>> [ 78.617577] do_syscall_64+0x6b/0xd7
>>>>>> [ 78.618043] entry_SYSCALL_64_after_hwframe+0x46/0x4e
>>>>>> [ 78.618667] RIP: 0033:0x7fed3de99a73
>>>>>> [ 78.619118] Code: 8b 15 a9 83 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8
>>>>>> 0f 1f 00 80 3d 71 0b 0d 00 00 41 89 ca 74 14 b8 2c 00 00 00 0f 05 <48> 3d 00 f0
>>>>>> ff ff 77 75 c3 0f 1f 40 00 55 48 83 ec 30 44 89 4c 24
>>>>>> [ 78.621291] RSP: 002b:00007ffff6bdf478 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
>>>>>> [ 78.622205] RAX: ffffffffffffffda RBX: 000055c538159340 RCX: 00007fed3de99a73
>>>>>> [ 78.623056] RDX: 00000000000007d8 RSI: 000055c53815f3c0 RDI: 0000000000000003
>>>>>> [ 78.623908] RBP: 000055c53815f3c0 R08: 000055c53815b5c0 R09: 0000000000000010
>>>>>> [ 78.624765] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000007d8
>>>>>> [ 78.625619] R13: 00007ffff6be0b60 R14: 0000001d00000001 R15: 000055c53815c680
>>>>>> [ 78.626480] </TASK>
>>>>>> [ 78.626773] ==================================================================
>>>>>> [ 78.627656] Disabling lock debugging due to kernel taint
>>>>>> [ 78.628305] BUG: kernel NULL pointer dereference, address: 0000000000000108
>>>>>> [ 78.629136] #PF: supervisor read access in kernel mode
>>>>>> [ 78.629766] #PF: error_code(0x0000) - not-present page
>>>>>> [ 78.630402] PGD 0 P4D 0
>>>>>> [ 78.630739] Oops: 0000 [#1] PREEMPT DEBUG_PAGEALLOC KASAN
>>>>>> [ 78.631398] CPU: 0 PID: 493 Comm: ping Tainted: G B 6.9.0-rc2-00697-g489ca863e24f-dirty #11
>>>>>> [ 78.632548] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
>>>>>> [ 78.633649] RIP: 0010:iptfs_output_collect+0x263/0x57b
>>>>>> [ 78.634283] Code: 73 70 0f 84 25 01 00 00 45 39 f4 0f 83 1c 01 00 00 48 8d 7b
>>>>>> 10 e8 27 37 62 ff 4c 8b 73 10 49 8d be 08 01 00 00 e8 17 37 62 ff <4d> 8b b6 08
>>>>>> 01 00 00 49 8d be b0 01 00 00 e8 04 37 62 ff 49 8b 86
>>>>>> [ 78.636444] RSP: 0018:ffffc90000d679c8 EFLAGS: 00010296
>>>>>> [ 78.637076] RAX: 0000000000000001 RBX: ffff888110ffbc80 RCX: fffffbfff07623ad
>>>>>> [ 78.637923] RDX: fffffbfff07623ad RSI: fffffbfff07623ad RDI: ffffffff83b11d60
>>>>>> [ 78.638792] RBP: ffff88810e3a1400 R08: 0000000000000008 R09: 0000000000000001
>>>>>> [ 78.639645] R10: ffffffff83b11d67 R11: fffffbfff07623ac R12: 00000000000005a2
>>>>>> [ 78.640498] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810e9a3401
>>>>>> [ 78.641359] FS: 00007fed3dbddc40(0000) GS:ffffffff82cb2000(0000) knlGS:0000000000000000
>>>>>> [ 78.642324] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>>>> [ 78.643022] CR2: 0000000000000108 CR3: 0000000110e84000 CR4: 0000000000350ef0
>>>>>> [ 78.643882] Call Trace:
>>>>>> [ 78.644204] <TASK>
>>>>>> [ 78.644487] ? __die_body+0x1a/0x56
>>>>>> [ 78.644929] ? page_fault_oops+0x45f/0x4cd
>>>>>> [ 78.645441] ? dump_pagetable+0x1db/0x1db
>>>>>> [ 78.645942] ? vprintk_emit+0x163/0x171
>>>>>> [ 78.646425] ? iptfs_output_collect+0x263/0x57b
>>>>>> [ 78.646986] ? _printk+0xb2/0xe1
>>>>>> [ 78.647401] ? find_first_fitting_seq+0x193/0x193
>>>>>> [ 78.647982] ? iptfs_output_collect+0x263/0x57b
>>>>>> [ 78.648541] ? do_user_addr_fault+0x14f/0x56c
>>>>>> [ 78.649084] ? exc_page_fault+0xa5/0xbe
>>>>>> [ 78.649566] ? asm_exc_page_fault+0x22/0x30
>>>>>> [ 78.650100] ? iptfs_output_collect+0x263/0x57b
>>>>>> [ 78.650660] ? iptfs_output_collect+0x263/0x57b
>>>>>> [ 78.651221] ip_send_skb+0x25/0x57
>>>>>> [ 78.651652] raw_sendmsg+0xee8/0x1011
>>>>>> [ 78.652113] ? native_flush_tlb_one_user+0xd/0xe5
>>>>>> [ 78.652693] ? raw_hash_sk+0x21b/0x21b
>>>>>> [ 78.653166] ? kernel_init_pages+0x42/0x51
>>>>>> [ 78.653683] ? prep_new_page+0x44/0x51
>>>>>> [ 78.654160] ? get_page_from_freelist+0x72b/0x915
>>>>>> [ 78.654739] ? signal_pending_state+0x77/0x77
>>>>>> [ 78.655284] ? __might_resched+0x8a/0x240
>>>>>> [ 78.655784] ? __might_sleep+0x25/0xa0
>>>>>> [ 78.656255] ? first_zones_zonelist+0x2c/0x43
>>>>>> [ 78.656798] ? __rcu_read_lock+0x2d/0x3a
>>>>>> [ 78.657289] ? __pte_offset_map+0x32/0xa4
>>>>>> [ 78.657788] ? __might_resched+0x8a/0x240
>>>>>> [ 78.658291] ? __might_sleep+0x25/0xa0
>>>>>> [ 78.658763] ? inet_send_prepare+0x54/0x54
>>>>>> [ 78.659272] ? sock_sendmsg_nosec+0x42/0x6c
>>>>>> [ 78.659791] sock_sendmsg_nosec+0x42/0x6c
>>>>>> [ 78.660293] __sys_sendto+0x15d/0x1cc
>>>>>> [ 78.660755] ? __x64_sys_getpeername+0x44/0x44
>>>>>> [ 78.661304] ? __handle_mm_fault+0x679/0xae4
>>>>>> [ 78.661838] ? find_vma+0x6b/0x8b
>>>>>> [ 78.662272] ? find_vma_intersection+0x8a/0x8a
>>>>>> [ 78.662828] ? __handle_irq_event_percpu+0x180/0x197
>>>>>> [ 78.663436] ? handle_mm_fault+0x38/0x154
>>>>>> [ 78.663935] ? handle_mm_fault+0xeb/0x154
>>>>>> [ 78.664435] ? preempt_latency_start+0x29/0x34
>>>>>> [ 78.664987] ? preempt_count_sub+0x14/0xb3
>>>>>> [ 78.665498] ? up_read+0x4b/0x5c
>>>>>> [ 78.665911] __x64_sys_sendto+0x76/0x82
>>>>>> [ 78.666398] do_syscall_64+0x6b/0xd7
>>>>>> [ 78.666849] entry_SYSCALL_64_after_hwframe+0x46/0x4e
>>>>>> [ 78.667466] RIP: 0033:0x7fed3de99a73
>>>>>> [ 78.667918] Code: 8b 15 a9 83 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8
>>>>>> 0f 1f 00 80 3d 71 0b 0d 00 00 41 89 ca 74 14 b8 2c 00 00 00 0f 05 <48> 3d 00 f0
>>>>>> ff ff 77 75 c3 0f 1f 40 00 55 48 83 ec 30 44 89 4c 24
>>>>>> [ 78.670097] RSP: 002b:00007ffff6bdf478 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
>>>>>> [ 78.671002] RAX: ffffffffffffffda RBX: 000055c538159340 RCX: 00007fed3de99a73
>>>>>> [ 78.671858] RDX: 00000000000007d8 RSI: 000055c53815f3c0 RDI: 0000000000000003
>>>>>> [ 78.672708] RBP: 000055c53815f3c0 R08: 000055c53815b5c0 R09: 0000000000000010
>>>>>> [ 78.673564] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000007d8
>>>>>> [ 78.674430] R13: 00007ffff6be0b60 R14: 0000001d00000001 R15: 000055c53815c680
>>>>>> [ 78.675287] </TASK>
>>>>>> [ 78.675580] Modules linked in:
>>>>>> [ 78.675975] CR2: 0000000000000108
>>>>>> [ 78.676396] ---[ end trace 0000000000000000 ]---
>>>>>> [ 78.676966] RIP: 0010:iptfs_output_collect+0x263/0x57b
>>>>>> [ 78.677596] Code: 73 70 0f 84 25 01 00 00 45 39 f4 0f 83 1c 01 00 00 48 8d 7b
>>>>>> 10 e8 27 37 62 ff 4c 8b 73 10 49 8d be 08 01 00 00 e8 17 37 62 ff <4d> 8b b6 08
>>>>>> 01 00 00 49 8d be b0 01 00 00 e8 04 37 62 ff 49 8b 86
>>>>>> [ 78.679768] RSP: 0018:ffffc90000d679c8 EFLAGS: 00010296
>>>>>> [ 78.680410] RAX: 0000000000000001 RBX: ffff888110ffbc80 RCX: fffffbfff07623ad
>>>>>> [ 78.681264] RDX: fffffbfff07623ad RSI: fffffbfff07623ad RDI: ffffffff83b11d60
>>>>>> [ 78.682136] RBP: ffff88810e3a1400 R08: 0000000000000008 R09: 0000000000000001
>>>>>> [ 78.682997] R10: ffffffff83b11d67 R11: fffffbfff07623ac R12: 00000000000005a2
>>>>>> [ 78.683853] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810e9a3401
>>>>>> [ 78.684710] FS: 00007fed3dbddc40(0000) GS:ffffffff82cb2000(0000) knlGS:0000000000000000
>>>>>> [ 78.685675] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>>>> [ 78.686387] CR2: 0000000000000108 CR3: 0000000110e84000 CR4: 0000000000350ef0
>>>>>> [ 78.687246] Kernel panic - not syncing: Fatal exception in interrupt
>>>>>> [ 78.688014] Kernel Offset: disabled
>>>>>> [ 78.688460] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---
>>>>>>
>>>>>> ping -s 2000 -n -q -W 1 -c 2 -I 192.0.3.254 192.0.2.254
>>>>>>
>>>>>> (gdb) list *iptfs_output_collect+0x263
>>>>>> 0xffffffff81d5076f is in iptfs_output_collect (./include/net/net_namespace.h:383).
>>>>>> 378 }
>>>>>> 379
>>>>>> 380 static inline struct net *read_pnet(const possible_net_t *pnet)
>>>>>> 381 {
>>>>>> 382 #ifdef CONFIG_NET_NS
>>>>>> 383 return rcu_dereference_protected(pnet->net, true);
>>>>>> 384 #else
>>>>>> 385 return &init_net;
>>>>>> 386 #endif
>>>>>> 387 }
>>>>>>
>>>>>> I suspect actual crash is from the line 1756 instead,
>>>>>> (gdb) list *iptfs_output_collect+0x256
>>>>>> 0xffffffff81d50762 is in iptfs_output_collect (net/xfrm/xfrm_iptfs.c:1756).
>>>>>> 1751 return 0;
>>>>>> 1752
>>>>>> 1753 /* We only send ICMP too big if the user has configured us as
>>>>>> 1754 * dont-fragment.
>>>>>> 1755 */
>>>>>> 1756 XFRM_INC_STATS(dev_net(skb->dev), LINUX_MIB_XFRMOUTERROR);
>>>>>> 1757
>>>>>> 1758 if (sk) {
>>>>>> 1759 xfrm_local_error(skb, pmtu);
>>>>>> 1760 } else if (ip_hdr(skb)->version == 4) {
>>>>>>
>>>>>> Later I ran with gdb iptfs_is_too_big which is called twice and second time
>>>>>> it crash.
>>>>>> Here is gdb bt. Just before the crash
>>>>>>
>>>>>> #0 iptfs_is_too_big (pmtu=1442, skb=0xffff88810dbea3c0, sk=0xffff888104d4ed40) at net/xfrm/xfrm_iptfs.c:1756
>>>>>> #1 iptfs_output_collect (net=<optimized out>, sk=0xffff888104d4ed40, skb=0xffff88810dbea3c0) at net/xfrm/xfrm_iptfs.c:1847
>>>>>> #2 0xffffffff81c8a3cb in ip_send_skb (net=0xffffffff83e57f20 <init_net>, skb=0xffff88810dbea3c0)
>>>>>> at net/ipv4/ip_output.c:1492
>>>>>> #3 0xffffffff81c8a439 in ip_push_pending_frames (sk=sk@...ry=0xffff888104d4ed40, fl4=fl4@...ry=0xffffc90000e3fb90)
>>>>>> at net/ipv4/ip_output.c:1512
>>>>>> #4 0xffffffff81ccf3cf in raw_sendmsg (sk=0xffff888104d4ed40, msg=0xffffc90000e3fd80, len=<optimized out>)
>>>>>> at net/ipv4/raw.c:654
>>>>>> #5 0xffffffff81b096ea in sock_sendmsg_nosec (sock=sock@...ry=0xffff888115136040, msg=msg@...ry=0xffffc90000e3fd80)
>>>>>> at net/socket.c:730
>>>>>> #6 0xffffffff81b0c327 in __sock_sendmsg (msg=0xffffc90000e3fd80, sock=0xffff888115136040) at net/socket.c:745
>>>>>> #7 __sys_sendto (fd=<optimized out>, buff=buff@...ry=0x558edefb73c0, len=len@...ry=2008, flags=flags@...ry=0,
>>>>>> addr=addr@...ry=0x558edefb35c0, addr_len=addr_len@...ry=16) at net/socket.c:2191
>>>>>> #8 0xffffffff81b0c40c in __do_sys_sendto (addr_len=16, addr=0x558edefb35c0, flags=0, len=2008, buff=0x558edefb73c0,
>>>>>> fd=<optimized out>) at net/socket.c:2203
>>>>>> #9 __se_sys_sendto (addr_len=16, addr=94072114722240, flags=0, len=2008, buff=94072114738112, fd=<optimized out>)
>>>>>> at net/socket.c:2199
>>>>>>
>>>>>> gdb) list
>>>>>> 1751 return 0;
>>>>>> 1752
>>>>>> 1753 /* We only send ICMP too big if the user has configured us as
>>>>>> 1754 * dont-fragment.
>>>>>> 1755 */
>>>>>> 1756 XFRM_INC_STATS(dev_net(skb->dev), LINUX_MIB_XFRMOUTERROR);
>>>>>> 1757
>>>>>> 1758 if (sk) {
>>>>>> 1759 xfrm_local_error(skb, pmtu);
>>>>>> 1760 } else if (ip_hdr(skb)->version == 4) {
>>>>>>
>>>>>> -antony
>>>>>
>>>>
>>>> [2. text/plain; .config]...
>>>
>>> [[End of PGP Signed Part]]
>>
>> a
>
>
>
>> --
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>> https://linux-ipsec.org/mailman/listinfo/devel
>
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