netdev - Re: 3.5.1 fib_rules

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Message-ID: <1345481979.5158.333.camel@edumazet-glaptop>
Date:	Mon, 20 Aug 2012 18:59:39 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dave Jones <davej@...hat.com>
Cc:	netdev@...r.kernel.org,
	Fedora Kernel Team <kernel-team@...oraproject.org>
Subject: Re: 3.5.1 fib_rules_lookup oops

On Mon, 2012-08-20 at 12:44 -0400, Dave Jones wrote:
> Just had a user report this, which I don't think I've seen reported here yet.
> Something new, or just something missing from -stable ?
> 
> 	Dave
> 
> 
> BUG: unable to handle kernel paging request at 5f726571
> IP: [<c0884808>] fib_rules_lookup+0x38/0x130
> *pdpt = 000000002b8ef001 *pde = 0000000000000000 
> Oops: 0000 [#1] SMP 
> Modules linked in: fuse ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat xt_CHECKSUM iptable_mangle bridge stp llc ip6t_REJECT nf_conntrack_ipv4 nf_conntrack_ipv6 nf_defrag_ipv4 nf_defrag_ipv6 xt_state ip6table_filter be2iscsi nf_conntrack iscsi_boot_sysfs ip6_tables bnx2i cnic uio cxgb4i it87 hwmon_vid cxgb4 cxgb3i cxgb3 mdio libcxgbi ib_iser rdma_cm ib_addr iw_cm ib_cm ib_sa ib_mad ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi tpm_bios snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_page_alloc vhost_net ppdev tun macvtap macvlan snd_timer parport_pc kvm_amd k8temp snd kvm forcedeth soundcore nv_tco parport i2c_nforce2 nfsd nfs_acl auth_rpcgss lockd uinput binfmt_misc sunrpc btrfs libcrc32c zlib_deflate firewire_ohci firewire_core ata_generic pata_acpi crc_itu_t sata_nv pata_amd nouveau mxm_wmi wmi video i2c_algo_bit drm_kms_helper ttm drm i2c_core [last unloaded: scsi_wait_scan]
> 
> Pid: 1943, comm: transmission-gt Not tainted 3.5.1-1.fc17.i686.PAE #1    /M55S-S3
> EIP: 0060:[<c0884808>] EFLAGS: 00010a97 CPU: 0
> EIP is at fib_rules_lookup+0x38/0x130
> EAX: 5f726565 EBX: 5f726565 ECX: 00000000 EDX: c0b45a15
> ESI: eb2f1d38 EDI: c0b45a59 EBP: eb2f1c44 ESP: eb2f1c24
>  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> CR0: 80050033 CR2: 5f726571 CR3: 33f3a000 CR4: 000007f0
> DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> DR6: ffff0ff0 DR7: 00000400
> Process transmission-gt (pid: 1943, ti=eb2f0000 task=f48bf110 task.ti=eb2f0000)
> Stack:
>  eb2f1c3c c0b45a59 00000000 c0b45a15 5f726565 eb2f1c90 eb2f1d38 c0be60c0
>  eb2f1c64 c08dacc9 eb2f1c50 00000000 eb2f1c90 00000000 00000001 00000000
>  eb2f1cb0 c089a2bc f75bc8c8 00000001 eb2f1c84 c066dd4f b4298b0e 00000001
> Call Trace:
>  [<c08dacc9>] fib_lookup+0x39/0x50
>  [<c089a2bc>] __ip_route_output_key+0x5cc/0x8b0
>  [<c066dd4f>] ? cpumask_next_and+0x1f/0x40
>  [<c089a5bf>] ip_route_output_flow+0x1f/0x70
>  [<c08c49bd>] udp_sendmsg+0x73d/0x8d0
>  [<c08a0010>] ? ip_copy_metadata+0x140/0x140
>  [<c08cd126>] inet_sendmsg+0x66/0xa0
>  [<c0622d1f>] ? selinux_socket_sendmsg+0x1f/0x30
>  [<c085c230>] sock_sendmsg+0xc0/0xf0
>  [<c0410e71>] ? __switch_to+0xc1/0x270
>  [<c047fce2>] ? idle_balance+0x102/0x150
>  [<c0679dd1>] ? _copy_from_user+0x41/0x60
>  [<c085c5a3>] ? move_addr_to_kernel+0x43/0x90
>  [<c085cf0d>] sys_sendto+0xfd/0x140
>  [<c046aa70>] ? update_rmtp+0x90/0x90
>  [<c046b956>] ? hrtimer_start_range_ns+0x26/0x30
>  [<c0589afb>] ? sys_epoll_wait+0x6b/0x370
>  [<c085d921>] sys_socketcall+0x1d1/0x2d0
>  [<c09672df>] sysenter_do_call+0x12/0x28
> Code: 00 89 45 ec 89 d6 89 c2 8b 40 44 89 d7 83 c7 44 89 4d e8 89 45 f0 8b 5d f0 39 fb 0f 84 a3 00 00 00 89 7d e4 8d b4 26 00 00 00 00 <8b> 53 0c 85 d2 74 31 31 c0 3b 56 04 74 2a f6 43 20 02 74 08 85 
> EIP: [<c0884808>] fib_rules_lookup+0x38/0x130 SS:ESP 0068:eb2f1c24
> --

It looks like a buffer overflow or memory reuse

5f726565 is not a valid pointer, but ASCII "eer_"



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