Re: [BUG] 2.6.20 Oopses in xfrm_audit_log

[Charles-Edouard Ruault <ce@ruault.com>]

Joy Latten wrote:
>> i upgraded to vanilla kernel 2.6.20 and while i was using strongswan 
>> 2.8.2 to setup an IPSEC VPN i got the following kernel Ooops.
>> I had successfully established the same tunnel a few times, but key 
>> renegotiation caused a problem ( both ends did not renegotiate at the 
>> same time so the tunnel was frozen ), i decided to kill the tunnel and 
>> start a new one ( using ipsec auto --down tunnel & ipsec auto --up 
>> tunnel ), while i was doing so, i got the oops.
>>
>> BUG: unable to handle kernel NULL pointer dereference at virtual address 
>> 00000188
>> printing eip:
>> c02fb85c
>> *pde = 00000000
>> Oops: 0000 [#1]
>> PREEMPT
>> Modules linked in: xfrm4_mode_tunnel usblp deflate zlib_deflate twofish 
>> twofish_common serpent blowfish des cbc ecb blkcipher xcbc sha256 sha1 
>> crypto_null xfrm4_tunnel tunnel4 ipcomp esp4 ah4 af_key autofs4 asb100 
>> hwmon_vid hidp rfcomm l2cap bluetooth sunrpc nf_conntrack_netbios_ns 
>> ipt_LOG xt_limit xt_mark xt_state xt_tcpudp iptable_filter 
>> ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 xt_MARK 
>> iptable_mangle ip_tables x_tables binfmt_misc sd_mod ipv6 sg hfsplus 
>> video button ac lp parport_pc parport floppy nvram usb_storage scsi_mod 
>> libusual usbhid hid ehci_hcd snd_via82xx snd_ac97_codec ac97_bus 
>> ohci1394 snd_seq_dummy uhci_hcd ieee1394 snd_seq_oss snd_seq_midi_event 
>> snd_seq snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_alloc 
>> snd_mpu401_uart snd_rawmidi snd_seq_device snd via_agp agpgart 
>> i2c_viapro soundcore eepro100 i2c_core b44 pcspkr mii shpchp usbcore dm_mod
>> CPU:    0
>> EIP:    0060:[<c02fb85c>]    Not tainted VLI
>> EFLAGS: 00010246   (2.6.20 #1)
>> EIP is at xfrm_audit_log+0x4cc/0x580
>> eax: ecb71061   ebx: c039d160   ecx: 00000000   edx: 00000021
>> esi: 000001f4   edi: 00000255   ebp: 00000000   esp: e8cd5a18
>> ds: 007b   es: 007b   ss: 0068
>> Process pluto (pid: 27486, ti=e8cd4000 task=d3557070 task.ti=e8cd4000)
>> Stack: c17d2ea0 c0354bf1 e183f9c0 00000003 c03ac59c e1399800 00000001 
>> 00000003
>>       f8d0a450 00000000 00000001 00000286 e8cd5a6c c011506b 00000000 
>> 00000286
>>       f73cb8c0 00000246 c17d2ea0 00000000 00000000 f73cb8c0 f8d03c67 
>> 00000000
>> Call Trace:
>> [<c011506b>] __wake_up+0x4b/0x80
>> [<f8d03c67>] pfkey_broadcast+0x137/0x1b0 [af_key]
>> [<f8d03e5f>] pfkey_send_policy_notify+0xef/0x1a0 [af_key]
>> [<c011d90e>] local_bh_enable+0x2e/0xa0
>> [<c0306107>] xfrm_get_policy+0x2b7/0x2f0
>> [<c0305e50>] xfrm_get_policy+0x0/0x2f0
>> [<c0304702>] xfrm_user_rcv_msg+0x102/0x1b0
>> [<c0304600>] xfrm_user_rcv_msg+0x0/0x1b0
>> [<c02b3782>] netlink_run_queue+0x82/0x120
>> [<c03045e8>] xfrm_netlink_rcv+0x28/0x40
>> [<c02b3d42>] netlink_data_ready+0x12/0x50
>> [<c02b2931>] netlink_sendskb+0x21/0x40
>> [<c02b3c50>] netlink_sendmsg+0x230/0x310
>> [<c02993cd>] sock_aio_write+0x11d/0x130
>> [<c01d538a>] avc_has_perm+0x5a/0x70
>> [<c0163ed5>] do_sync_write+0xd5/0x120
>> [<c012c960>] autoremove_wake_function+0x0/0x50
>> [<c01648c7>] vfs_write+0x177/0x180
>> [<c0164ea1>] sys_write+0x41/0x70
>> [<c0102f14>] syscall_call+0x7/0xb
>> =======================
>> Code: 8b 44 24 70 c1 e2 08 c1 e8 08 09 c2 0f b7 c2 89 44 24 08 8b 44 24 
>> 48 89 04 24 e8 10 eb e3 ff e9 bc fc ff ff 8b 8c 24 c0 00 00 00 <8b> 91 
>> 88 01 00 00 0f b7 99 82 00 00 00 85 d2 0f 85 64 fc ff ff
>> EIP: [<c02fb85c>] xfrm_audit_log+0x4cc/0x580 SS:ESP 0068:e8cd5a18
>>
>>
>>     
>
> This is similar to another bug reported last month.
> Here is the patch I sent out then. Please let me know
> how it goes.
>
> Regards,
> Joy
>
> Signed-off-by: Joy Latten <latten@austin.ibm.com>
>
>
> diff -urpN linux-2.6.19.orig/net/xfrm/xfrm_policy.c linux-2.6.19/net/xfrm/xfrm_policy.c
> --- linux-2.6.19.orig/net/xfrm/xfrm_policy.c	2007-01-02 14:24:14.000000000 -0600
> +++ linux-2.6.19/net/xfrm/xfrm_policy.c	2007-01-02 14:28:24.000000000 -0600
> @@ -2003,6 +2003,9 @@ void xfrm_audit_log(uid_t auid, u32 sid,
>  	if (audit_enabled == 0)
>  		return;
>  
> +	if ((x == NULL) && (xp == NULL))
> +		return;
> +
>  	audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type);
>  	if (audit_buf == NULL)
>  	return;
> diff -urpN linux-2.6.19.orig/net/xfrm/xfrm_user.c linux-2.6.19/net/xfrm/xfrm_user.c
> --- linux-2.6.19.orig/net/xfrm/xfrm_user.c	2007-01-02 14:24:14.000000000 -0600
> +++ linux-2.6.19/net/xfrm/xfrm_user.c	2007-01-02 14:28:14.000000000 -0600
> @@ -1268,10 +1268,6 @@ static int xfrm_get_policy(struct sk_buf
>  		xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, delete);
>  		security_xfrm_policy_free(&tmp);
>  	}
> -	if (delete)
> -		xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
> -			       AUDIT_MAC_IPSEC_DELSPD, (xp) ? 1 : 0, xp, NULL);
> -
>  	if (xp == NULL)
>  		return -ENOENT;
>  
> @@ -1289,6 +1285,10 @@ static int xfrm_get_policy(struct sk_buf
>  	} else {
>  		if ((err = security_xfrm_policy_delete(xp)) != 0)
>  			goto out;
> +
> +		xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
> +			       AUDIT_MAC_IPSEC_DELSPD, (xp) ? 1 : 0, xp, NULL);
> +
>  		c.data.byid = p->index;
>  		c.event = nlh->nlmsg_type;
>  		c.seq = nlh->nlmsg_seq;
>   
Thanks for the quick reply  & for the patch.
I'm recompiling as i write this email. I'll let you know if i experience
the problem again !
Regards.

-- 
Charles-Edouard Ruault
PGP Key ID E4D2B80C

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