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Date: Mon, 3 Jun 2013 00:02:52 +0200 From: Sébastien RAULT <sebastien@...er.com> To: <netdev@...r.kernel.org> Subject: Oops when masquerading ipv4 on ipv6 ipsec Hi, I wish to report an oops which occurred when using NAT for IPv4 and an ipv6 ipsec tunnel. Steps to reproduce the bug: - Host A is a linux router for the private network 192.168.0.1/24. his public address is 2001::a on enp2s0, the public interface. - Host B is a linux router (same as A) for the private network 192.168.1.1/24, his public address is 2001::b. - On Host A, have this only rule on PSOTROUTING of table nat: iptables -t nat -A POSTROUTING -o enp2s0 -s 192.168.0.0/24 -j MASQUERADE --random - Configure & start ipsec (I use strongswan) to link the 2 private networks. - Do this ping on Host A: ping 192.168.1.1 This bug exists at least on kernel 3.7.5, 3.8.3, 3.8.6 and 3.9.2 (archi x64). The trace (it's with grsec, but I have also tested with a vanilla kernel): May 20 12:51:06 sargeras kernel: PAX: please report this to pageexec@...email.hu May 20 12:51:06 sargeras kernel: BUG: unable to handle kernel NULL pointer dereference at 00000000000002a0 May 20 12:51:06 sargeras kernel: IP: [<ffffffff813bd7b6>] xfrm_output_one+0xa7/0x230 May 20 12:51:06 sargeras kernel: PGD 7ca5f000 May 20 12:51:06 sargeras kernel: Thread overran stack, or stack corrupted May 20 12:51:06 sargeras kernel: Oops: 0000 [#1] SMP May 20 12:51:06 sargeras kernel: Modules linked in: xfrm_user vsock(O) vmsync(O) coretemp processor thermal_sys microcode vmci(O) May 20 12:51:06 sargeras kernel: CPU 0 May 20 12:51:06 sargeras kernel: Pid: 2274, comm: ping Tainted: G O 3.8.6-hardened #2 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform May 20 12:51:06 sargeras kernel: RIP: 0010:[<ffffffff813bd7b6>] [<ffffffff813bd7b6>] xfrm_output_one+0xa7/0x230 # /usr/src/linux/net/xfrm/xfrm_output.c:57 May 20 12:51:06 sargeras kernel: RSP: 0018:ffff88007b4b98e8 EFLAGS: 00010286 May 20 12:51:06 sargeras kernel: RAX: 000000000000021c RBX: ffff88007b400d80 RCX: 0000000000000000 May 20 12:51:06 sargeras kernel: RDX: 00000000fffffde4 RSI: 0000000000000000 RDI: ffff88007b400d80 May 20 12:51:06 sargeras kernel: RBP: ffff88007b4b9918 R08: 00000000d97586c6 R09: 0000000000000600 May 20 12:51:06 sargeras kernel: R10: ffff88007b4b9718 R11: ffff88007ada90f0 R12: 0000000000000000 May 20 12:51:06 sargeras kernel: R13: 8000000000000000 R14: 000000000203a8c0 R15: 0000000000000000 May 20 12:51:06 sargeras kernel: FS: 0000032bc14a9700(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000 May 20 12:51:06 sargeras kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b May 20 12:51:06 sargeras kernel: CR2: 00000000000002a0 CR3: 0000000001434000 CR4: 00000000000007f0 May 20 12:51:06 sargeras kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 May 20 12:51:06 sargeras kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 May 20 12:51:06 sargeras kernel: Process ping (pid: 2274, threadinfo ffff88007cb1dc40, task ffff88007cb1d850) May 20 12:51:06 sargeras kernel: Stack: May 20 12:51:06 sargeras kernel: ffff88007b4b9948 ffffffff00000001 0000000000000001 ffff88007b400d80 May 20 12:51:06 sargeras kernel: 8000000000000000 000000000203a8c0 ffff88007b4b9958 ffffffff813bda44 May 20 12:51:06 sargeras kernel: ffffffff813ed84c ffff88007b400d80 0000000000000004 ffff88007b400d80 May 20 12:51:06 sargeras kernel: Call Trace: May 20 12:51:06 sargeras kernel: [<ffffffff813bda44>] xfrm_output_resume+0x105/0x131 # /usr/src/linux/net/xfrm/xfrm_output.c:116 May 20 12:51:06 sargeras kernel: [<ffffffff813ed84c>] ? xfrm6_extract_output+0x3d/0x3d May 20 12:51:06 sargeras kernel: [<ffffffff813ed84c>] ? xfrm6_extract_output+0x3d/0x3d # /usr/src/linux/net/ipv6/xfrm6_output.c:126 May 20 12:51:06 sargeras kernel: [<ffffffff813bda8a>] xfrm_output2+0x1a/0x22 # /usr/src/linux/net/xfrm/xfrm_output.c:144 May 20 12:51:06 sargeras kernel: [<ffffffff8136e65d>] ? ip_setup_cork+0xfb/0xfb # /usr/src/linux/net/ipv4/ip_output.c:722 May 20 12:51:06 sargeras kernel: [<ffffffff813bdb4b>] xfrm_output+0xb9/0xca # /usr/src/linux/net/xfrm/xfrm_output.c:195 May 20 12:51:06 sargeras kernel: [<ffffffff813ed84c>] ? xfrm6_extract_output+0x3d/0x3d # /usr/src/linux/net/ipv6/xfrm6_output.c:126 May 20 12:51:06 sargeras kernel: [<ffffffff813ed86c>] xfrm6_output_finish+0x20/0x28 # /usr/src/linux/net/ipv6/xfrm6_output.c:133 May 20 12:51:06 sargeras kernel: [<ffffffff813b4ea1>] xfrm4_output+0x78/0x87 # /usr/src/linux/net/ipv4/xfrm4_output.c:101 May 20 12:51:06 sargeras kernel: [<ffffffff8136fcd7>] ip_local_out+0x31/0x3b # /usr/src/linux/net/ipv4/ip_output.c:113 May 20 12:51:06 sargeras kernel: [<ffffffff81370cff>] ip_send_skb+0x15/0x41 # /usr/src/linux/net/ipv4/ip_output.c:1365 May 20 12:51:06 sargeras kernel: [<ffffffff81370d68>] ip_push_pending_frames+0x3d/0x4a # /usr/src/linux/net/ipv4/ip_output.c:1385 / /usr/src/linux/include/net/ip.h:137 May 20 12:51:06 sargeras kernel: [<ffffffff81390ab1>] raw_sendmsg+0x365/0x401 # /usr/src/linux/net/ipv4/raw.c:615 / May 20 12:51:06 sargeras kernel: [<ffffffff8139b811>] inet_sendmsg+0x97/0xa6 May 20 12:51:06 sargeras kernel: [<ffffffff8130aaa7>] sock_sendmsg+0x9e/0xc5 May 20 12:51:06 sargeras kernel: [<ffffffff81319973>] ? verify_iovec+0x168/0x1e9 May 20 12:51:06 sargeras kernel: [<ffffffff8130afc4>] __sys_sendmsg+0x3d5/0x4cf May 20 12:51:06 sargeras kernel: [<ffffffff8130ab61>] ? sockfd_lookup_light+0x2a/0x73 May 20 12:51:06 sargeras kernel: [<ffffffff8130e912>] sys_sendmsg+0x43/0x6a May 20 12:51:06 sargeras kernel: [<ffffffff81427cfa>] system_call_fastpath+0x18/0x1d May 20 12:51:06 sargeras kernel: Code: 85 f6 7f 08 31 f6 85 d2 7f 0c eb 1f 85 d2 b8 00 00 00 00 0f 48 d0 b9 20 00 00 00 48 89 df e8 6a 94 f5 ff 85 c0 0f 85 79 01 00 00 <49> 8b 84 24 a0 02 00 00 49 be 00 00 00 00 00 00 00 80 48 89 de May 20 12:51:06 sargeras kernel: RIP [<ffffffff813bd7b6>] xfrm_output_one+0xa7/0x230 May 20 12:51:06 sargeras kernel: RSP <ffff88007b4b98e8> May 20 12:51:06 sargeras kernel: CR2: 00000000000002a0 May 20 12:51:06 sargeras kernel: ---[ end trace 15eb41c127dbce11 ]--- -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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