1. 26 Jan, 2012 4 commits
    • Eric Dumazet's avatar
      netns: fix net_alloc_generic() · 073862ba
      Eric Dumazet authored
      When a new net namespace is created, we should attach to it a "struct
      net_generic" with enough slots (even empty), or we can hit the following
      BUG_ON() :
      
      [  200.752016] kernel BUG at include/net/netns/generic.h:40!
      ...
      [  200.752016]  [<ffffffff825c3cea>] ? get_cfcnfg+0x3a/0x180
      [  200.752016]  [<ffffffff821cf0b0>] ? lockdep_rtnl_is_held+0x10/0x20
      [  200.752016]  [<ffffffff825c41be>] caif_device_notify+0x2e/0x530
      [  200.752016]  [<ffffffff810d61b7>] notifier_call_chain+0x67/0x110
      [  200.752016]  [<ffffffff810d67c1>] raw_notifier_call_chain+0x11/0x20
      [  200.752016]  [<ffffffff821bae82>] call_netdevice_notifiers+0x32/0x60
      [  200.752016]  [<ffffffff821c2b26>] register_netdevice+0x196/0x300
      [  200.752016]  [<ffffffff821c2ca9>] register_netdev+0x19/0x30
      [  200.752016]  [<ffffffff81c1c67a>] loopback_net_init+0x4a/0xa0
      [  200.752016]  [<ffffffff821b5e62>] ops_init+0x42/0x180
      [  200.752016]  [<ffffffff821b600b>] setup_net+0x6b/0x100
      [  200.752016]  [<ffffffff821b6466>] copy_net_ns+0x86/0x110
      [  200.752016]  [<ffffffff810d5789>] create_new_namespaces+0xd9/0x190
      
      net_alloc_generic() should take into account the maximum index into the
      ptr array, as a subsystem might use net_generic() anytime.
      
      This also reduces number of reallocations in net_assign_generic()
      Reported-by: default avatarSasha Levin <levinsasha928@gmail.com>
      Tested-by: default avatarSasha Levin <levinsasha928@gmail.com>
      Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Cc: Sjur Brændeland <sjur.brandeland@stericsson.com>
      Cc: Eric W. Biederman <ebiederm@xmission.com>
      Cc: Pavel Emelyanov <xemul@openvz.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      073862ba
    • Flavio Leitner's avatar
      tcp: bind() optimize port allocation · fddb7b57
      Flavio Leitner authored
      Port autoselection finds a port and then drop the lock,
      then right after that, gets the hash bucket again and lock it.
      
      Fix it to go direct.
      Signed-off-by: default avatarFlavio Leitner <fbl@redhat.com>
      Signed-off-by: default avatarMarcelo Ricardo Leitner <mleitner@redhat.com>
      Acked-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      fddb7b57
    • Flavio Leitner's avatar
      tcp: bind() fix autoselection to share ports · 2b05ad33
      Flavio Leitner authored
      The current code checks for conflicts when the application
      requests a specific port.  If there is no conflict, then
      the request is granted.
      
      On the other hand, the port autoselection done by the kernel
      fails when all ports are bound even when there is a port
      with no conflict available.
      
      The fix changes port autoselection to check if there is a
      conflict and use it if not.
      Signed-off-by: default avatarFlavio Leitner <fbl@redhat.com>
      Signed-off-by: default avatarMarcelo Ricardo Leitner <mleitner@redhat.com>
      Acked-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2b05ad33
    • James Chapman's avatar
      l2tp: l2tp_ip - fix possible oops on packet receive · 68315801
      James Chapman authored
      When a packet is received on an L2TP IP socket (L2TPv3 IP link
      encapsulation), the l2tpip socket's backlog_rcv function calls
      xfrm4_policy_check(). This is not necessary, since it was called
      before the skb was added to the backlog. With CONFIG_NET_NS enabled,
      xfrm4_policy_check() will oops if skb->dev is null, so this trivial
      patch removes the call.
      
      This bug has always been present, but only when CONFIG_NET_NS is
      enabled does it cause problems. Most users are probably using UDP
      encapsulation for L2TP, hence the problem has only recently
      surfaced.
      
      EIP: 0060:[<c12bb62b>] EFLAGS: 00210246 CPU: 0
      EIP is at l2tp_ip_recvmsg+0xd4/0x2a7
      EAX: 00000001 EBX: d77b5180 ECX: 00000000 EDX: 00200246
      ESI: 00000000 EDI: d63cbd30 EBP: d63cbd18 ESP: d63cbcf4
       DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
      Call Trace:
       [<c1218568>] sock_common_recvmsg+0x31/0x46
       [<c1215c92>] __sock_recvmsg_nosec+0x45/0x4d
       [<c12163a1>] __sock_recvmsg+0x31/0x3b
       [<c1216828>] sock_recvmsg+0x96/0xab
       [<c10b2693>] ? might_fault+0x47/0x81
       [<c10b2693>] ? might_fault+0x47/0x81
       [<c1167fd0>] ? _copy_from_user+0x31/0x115
       [<c121e8c8>] ? copy_from_user+0x8/0xa
       [<c121ebd6>] ? verify_iovec+0x3e/0x78
       [<c1216604>] __sys_recvmsg+0x10a/0x1aa
       [<c1216792>] ? sock_recvmsg+0x0/0xab
       [<c105a99b>] ? __lock_acquire+0xbdf/0xbee
       [<c12d5a99>] ? do_page_fault+0x193/0x375
       [<c10d1200>] ? fcheck_files+0x9b/0xca
       [<c10d1259>] ? fget_light+0x2a/0x9c
       [<c1216bbb>] sys_recvmsg+0x2b/0x43
       [<c1218145>] sys_socketcall+0x16d/0x1a5
       [<c11679f0>] ? trace_hardirqs_on_thunk+0xc/0x10
       [<c100305f>] sysenter_do_call+0x12/0x38
      Code: c6 05 8c ea a8 c1 01 e8 0c d4 d9 ff 85 f6 74 07 3e ff 86 80 00 00 00 b9 17 b6 2b c1 ba 01 00 00 00 b8 78 ed 48 c1 e8 23 f6 d9 ff <ff> 76 0c 68 28 e3 30 c1 68 2d 44 41 c1 e8 89 57 01 00 83 c4 0c
      Signed-off-by: default avatarJames Chapman <jchapman@katalix.com>
      Acked-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      68315801
  2. 24 Jan, 2012 15 commits
  3. 23 Jan, 2012 21 commits