• Wei Yongjun's avatar
    sctp: fix to calc the INIT/INIT-ACK chunk length correctly is set · a8170c35
    Wei Yongjun authored
    When calculating the INIT/INIT-ACK chunk length, we should not
    only account the length of parameters, but also the parameters
    zero padding length, such as AUTH HMACS parameter and CHUNKS
    parameter. Without the parameters zero padding length we may get
    following oops.
    
    skb_over_panic: text:ce2068d2 len:130 put:6 head:cac3fe00 data:cac3fe00 tail:0xcac3fe82 end:0xcac3fe80 dev:<NULL>
    ------------[ cut here ]------------
    kernel BUG at net/core/skbuff.c:127!
    invalid opcode: 0000 [#2] SMP
    last sysfs file: /sys/module/aes_generic/initstate
    Modules linked in: authenc ......
    
    Pid: 4102, comm: sctp_darn Tainted: G      D    2.6.34-rc2 #6
    EIP: 0060:[<c0607630>] EFLAGS: 00010282 CPU: 0
    EIP is at skb_over_panic+0x37/0x3e
    EAX: 00000078 EBX: c07c024b ECX: c07c02b9 EDX: cb607b78
    ESI: 00000000 EDI: cac3fe7a EBP: 00000002 ESP: cb607b74
     DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
    Process sctp_darn (pid: 4102, ti=cb607000 task=cabdc990 task.ti=cb607000)
    Stack:
     c07c02b9 ce2068d2 00000082 00000006 cac3fe00 cac3fe00 cac3fe82 cac3fe80
    <0> c07c024b cac3fe7c cac3fe7a c0608dec ca986e80 ce2068d2 00000006 0000007a
    <0> cb8120ca ca986e80 cb812000 00000003 cb8120c4 ce208a25 cb8120ca cadd9400
    Call Trace:
     [<ce2068d2>] ? sctp_addto_chunk+0x45/0x85 [sctp]
     [<c0608dec>] ? skb_put+0x2e/0x32
     [<ce2068d2>] ? sctp_addto_chunk+0x45/0x85 [sctp]
     [<ce208a25>] ? sctp_make_init+0x279/0x28c [sctp]
     [<c0686a92>] ? apic_timer_interrupt+0x2a/0x30
     [<ce1fdc0b>] ? sctp_sf_do_prm_asoc+0x2b/0x7b [sctp]
     [<ce202823>] ? sctp_do_sm+0xa0/0x14a [sctp]
     [<ce2133b9>] ? sctp_pname+0x0/0x14 [sctp]
     [<ce211d72>] ? sctp_primitive_ASSOCIATE+0x2b/0x31 [sctp]
     [<ce20f3cf>] ? sctp_sendmsg+0x7a0/0x9eb [sctp]
     [<c064eb1e>] ? inet_sendmsg+0x3b/0x43
     [<c04244b7>] ? task_tick_fair+0x2d/0xd9
     [<c06031e1>] ? sock_sendmsg+0xa7/0xc1
     [<c0416afe>] ? smp_apic_timer_interrupt+0x6b/0x75
     [<c0425123>] ? dequeue_task_fair+0x34/0x19b
     [<c0446abb>] ? sched_clock_local+0x17/0x11e
     [<c052ea87>] ? _copy_from_user+0x2b/0x10c
     [<c060ab3a>] ? verify_iovec+0x3c/0x6a
     [<c06035ca>] ? sys_sendmsg+0x186/0x1e2
     [<c042176b>] ? __wake_up_common+0x34/0x5b
     [<c04240c2>] ? __wake_up+0x2c/0x3b
     [<c057e35c>] ? tty_wakeup+0x43/0x47
     [<c04430f2>] ? remove_wait_queue+0x16/0x24
     [<c0580c94>] ? n_tty_read+0x5b8/0x65e
     [<c042be02>] ? default_wake_function+0x0/0x8
     [<c0604e0e>] ? sys_socketcall+0x17f/0x1cd
     [<c040264c>] ? sysenter_do_call+0x12/0x22
    Code: 0f 45 de 53 ff b0 98 00 00 00 ff b0 94 ......
    EIP: [<c0607630>] skb_over_panic+0x37/0x3e SS:ESP 0068:cb607b74
    
    To reproduce:
    
    # modprobe sctp
    # echo 1 > /proc/sys/net/sctp/addip_enable
    # echo 1 > /proc/sys/net/sctp/auth_enable
    # sctp_test -H 3ffe:501:ffff:100:20c:29ff:fe4d:f37e -P 800 -l
    # sctp_darn -H 3ffe:501:ffff:100:20c:29ff:fe4d:f37e -P 900 -h 192.168.0.21 -p 800 -I -s -t
    sctp_darn ready to send...
    3ffe:501:ffff:100:20c:29ff:fe4d:f37e:900-192.168.0.21:800 Interactive mode> bindx-add=192.168.0.21
    3ffe:501:ffff:100:20c:29ff:fe4d:f37e:900-192.168.0.21:800 Interactive mode> bindx-add=192.168.1.21
    3ffe:501:ffff:100:20c:29ff:fe4d:f37e:900-192.168.0.21:800 Interactive mode> snd=10
    
    ------------------------------------------------------------------
    eth0 has addresses: 3ffe:501:ffff:100:20c:29ff:fe4d:f37e and 192.168.0.21
    eth1 has addresses: 192.168.1.21
    ------------------------------------------------------------------
    Reported-by: default avatarGeorge Cheimonidis <gchimon@gmail.com>
    Signed-off-by: default avatarWei Yongjun <yjwei@cn.fujitsu.com>
    Signed-off-by: default avatarVlad Yasevich <vladislav.yasevich@hp.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    a8170c35
sm_make_chunk.c 97.8 KB