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Date: Tue, 27 Nov 2001 16:02:36 +0100 (CET)
From: Martin Josefsson <gandalf@marcelothewonderpenguin.com>
To: Rolf Fokkens <fokkensr@linux06.vertis.nl>
cc: linux-kernel@vger.kernel.org, netfilter-devel@lists.samba.org
Subject: Re: [BUG] vanilla 2.4.15 iptables/REDIRECT kernel oops
In-Reply-To: <200111271143.MAA11403@linux06.vertis.nl>
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On Tue, 27 Nov 2001, Rolf Fokkens wrote:

I've forwarded this report to the place where it should be reported, the
netfilter-devel@lists.samba.org mailinglist as I havn't seen this report
there.

/Martin

> I got another kernel oops related to iptables/REDIRECT, this time it's a plain vanilla kernel 2.4.15
> 
> iptables -t nat -I PREROUTING -p tcp --dst 145.66.1.1 \
>                --dport 1080 -j REDIRECT --to 80 > /dev/null 2>&1
> iptables -t nat -I OUTPUT     -p tcp --dst 145.66.1.1 \
>                --dport 1080 -j REDIRECT --to 80 > /dev/null 2>&1
> 
> This redirects connects to the machine itself (145.66.1.1) port 1080 to port
> 80, which is where apache listens. Connecting to http://145.66.1.1:1080/ seems
> to result in the reported oops, as reported before. It's very reproducable
> here, on several machines. So enjoy!
> 
> Rolf
> 
> [fokkensr@iasdev fokkensr]$ ksymoops -k ksyms-2.4.15 -i -m /boot/System.map-2.4.15 -o /lib/modules/2.4.15/ < oops-2.4.15.txt
> 
> ksymoops 2.4.3 on i686 2.4.8-clk.  Options used
>      -V (default)
>      -k ksyms-2.4.15 (specified)
>      -l /proc/modules (default)
>      -o /lib/modules/2.4.15/ (specified)
>      -m /boot/System.map-2.4.15 (specified)
>      -i
> 
> Unable to handle kernel NULL pointer dereference at virtual address 0000034e
> c0200cb5
> *pde = 00000000
> Oops:   0000
> CPU:    0
> EIP:    0010:[<c0200cb5>] not tainted
> Using defaults from ksymoops -t elf32-i386 -a i386
> EFLAGS: 00010246
> eax: 000005dc ebx: f76b0ea0 ecx: f76be800 edx: 00000000
> esi: f76b30ac edi: 00000000 ebp: f72ab224 esp: f7193d98
> ds: 0010 es: 0018 ss: 0018
> Stack: 00000001 f7192000 00000003 00000000 f76be800 c01f102d f76b0ea0 f76bc0ac
>        f72fa6d4 f76b0130 f76bc0c0 f7193dd8 c034bed8 c01ffb46 00000002 00000003
>        f76b0ea0 00000000 f76be800 c0200c14 0000003c f72fa6d4 f76b0130 f76bc0c0
> Call Trace: <c01f102d> <c01ffb46> <c0200c14> <c0198c23> <c0216179>
>             <c0210238> <c02107f2> <c0210b23> <c020617f> <c0223acc> <c0223b06>
>             <c01e115d> <c0223acc> <c01e137b> <c01437ec> <c01076a3>
> Code: 8a 87 4c 03 00 00 3c 02 74 0a 3c 01 75 0b f6 45 20 04 75 05
> 
> >>EIP; c0200cb4 <ip_queue_xmit2+a0/22c>   <=====
> Trace; c01f102c <nf_hook_slow+19c/21c>
> Trace; c01ffb46 <ip_queue_xmit+28e/300>
> Trace; c0200c14 <ip_queue_xmit2+0/22c>
> Trace; c0198c22 <generic_unplug_device+62/b0>
> Trace; c0216178 <tcp_v4_send_check+6c/ac>
> Trace; c0210238 <tcp_cwnd_restart+18/a4>
> Trace; c02107f2 <tcp_transmit_skb+52e/5ec>
> Trace; c0210b22 <tcp_push_one+8a/114>
> Trace; c020617e <tcp_sendmsg+b3a/1370>
> Trace; c0223acc <inet_sendmsg+0/40>
> Trace; c0223b06 <inet_sendmsg+3a/40>
> Trace; c01e115c <sock_sendmsg+80/a4>
> Trace; c0223acc <inet_sendmsg+0/40>
> Trace; c01e137a <sock_write+a2/ac>
> Trace; c01437ec <sys_write+8c/c4>
> Trace; c01076a2 <system_call+2e/34>
> Code;  c0200cb4 <ip_queue_xmit2+a0/22c>
> 00000000 <_EIP>:
> Code;  c0200cb4 <ip_queue_xmit2+a0/22c>   <=====
>    0:   8a 87 4c 03 00 00         mov    0x34c(%edi),%al   <=====
> Code;  c0200cba <ip_queue_xmit2+a6/22c>
>    6:   3c 02                     cmp    $0x2,%al
> Code;  c0200cbc <ip_queue_xmit2+a8/22c>
>    8:   74 0a                     je     14 <_EIP+0x14> c0200cc8 <ip_queue_xmit2+b4/22c>
> Code;  c0200cbe <ip_queue_xmit2+aa/22c>
>    a:   3c 01                     cmp    $0x1,%al
> Code;  c0200cc0 <ip_queue_xmit2+ac/22c>
>    c:   75 0b                     jne    19 <_EIP+0x19> c0200ccc <ip_queue_xmit2+b8/22c>
> Code;  c0200cc2 <ip_queue_xmit2+ae/22c>
>    e:   f6 45 20 04               testb  $0x4,0x20(%ebp)
> Code;  c0200cc6 <ip_queue_xmit2+b2/22c>
>   12:   75 05                     jne    19 <_EIP+0x19> c0200ccc <ip_queue_xmit2+b8/22c>
> -
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