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2013-12-08net: rework recvmsg handler msg_name and msg_namelen logicHannes Frederic Sowa
[ Upstream commit f3d3342602f8bcbf37d7c46641cb9bca7618eb1c ] This patch now always passes msg->msg_namelen as 0. recvmsg handlers must set msg_namelen to the proper size <= sizeof(struct sockaddr_storage) to return msg_name to the user. This prevents numerous uninitialized memory leaks we had in the recvmsg handlers and makes it harder for new code to accidentally leak uninitialized memory. Optimize for the case recvfrom is called with NULL as address. We don't need to copy the address at all, so set it to NULL before invoking the recvmsg handler. We can do so, because all the recvmsg handlers must cope with the case a plain read() is called on them. read() also sets msg_name to NULL. Also document these changes in include/linux/net.h as suggested by David Miller. Changes since RFC: Set msg->msg_name = NULL if user specified a NULL in msg_name but had a non-null msg_namelen in verify_iovec/verify_compat_iovec. This doesn't affect sendto as it would bail out earlier while trying to copy-in the address. It also more naturally reflects the logic by the callers of verify_iovec. With this change in place I could remove " if (!uaddr || msg_sys->msg_namelen == 0) msg->msg_name = NULL ". This change does not alter the user visible error logic as we ignore msg_namelen as long as msg_name is NULL. Also remove two unnecessary curly brackets in ___sys_recvmsg and change comments to netdev style. Cc: David Miller <davem@davemloft.net> Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-16Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
2013-08-05net/vmw_vsock/af_vsock.c: drop unneeded semicolonJulia Lawall
Drop the semicolon at the end of the list_for_each_entry loop header. Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-28VSOCK: Move af_vsock.h and vsock_addr.h to include/netAsias He
This is useful for other VSOCK transport implemented outside the net/vmw_vsock/ directory to use these headers. Signed-off-by: Asias He <asias@redhat.com> Acked-by: Andy King <acking@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-24VSOCK: Fix VSOCK_HASH and VSOCK_CONN_HASHAsias He
If we mod with VSOCK_HASH_SIZE -1, we get 0, 1, .... 249. Actually, we have vsock_bind_table[0 ... 250] and vsock_connected_table[0 .. 250]. In this case the last entry will never be used. We should mod with VSOCK_HASH_SIZE instead. Signed-off-by: Asias He <asias@redhat.com> Acked-by: Andy King <acking@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-24VSOCK: Remove unnecessary labelAsias He
Signed-off-by: Asias He <asias@redhat.com> Acked-by: Andy King <acking@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-24VSOCK: Return VMCI_ERROR_NO_MEM when fails to allocate skbAsias He
vmci_transport_recv_dgram_cb always return VMCI_SUCESS even if we fail to allocate skb, return VMCI_ERROR_NO_MEM instead. Signed-off-by: Asias He <asias@redhat.com> Acked-by: Andy King <acking@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-24VSOCK: Introduce vsock_auto_bind helperAsias He
This peace of code is called three times, let's have a helper for it. Signed-off-by: Asias He <asias@redhat.com> Acked-by: Andy King <acking@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-04-30Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
Conflicts: drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c drivers/net/ethernet/emulex/benet/be.h include/net/tcp.h net/mac802154/mac802154.h Most conflicts were minor overlapping stuff. The be2net driver brought in some fixes that added __vlan_put_tag calls, which in net-next take an additional argument. Signed-off-by: David S. Miller <davem@davemloft.net>
2013-04-25VSOCK: Drop bogus __init annotation from vsock_init_tables()Geert Uytterhoeven
If gcc (e.g. 4.1.2) decides not to inline vsock_init_tables(), this will cause a section mismatch: WARNING: net/vmw_vsock/vsock.o(.text+0x1bc): Section mismatch in reference from the function __vsock_core_init() to the function .init.text:vsock_init_tables() The function __vsock_core_init() references the function __init vsock_init_tables(). This is often because __vsock_core_init lacks a __init annotation or the annotation of vsock_init_tables is wrong. This may cause crashes if VSOCKETS=y and VMWARE_VMCI_VSOCKETS=m. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-04-25VSOCK: Fix misc device registrationAsias He
When we call vsock_core_init to init VSOCK the second time, vsock_device.minor still points to the old dynamically allocated minor number. misc_register will allocate it for us successfully as if we were asking for a static one. However, when other user call misc_register to allocate a dynamic minor number, it will give the one used by vsock_core_init(), causing this: [ 405.470687] WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xcc/0xf0() [ 405.470689] Hardware name: OptiPlex 790 [ 405.470690] sysfs: cannot create duplicate filename '/dev/char/10:54' Always set vsock_device.minor to MISC_DYNAMIC_MINOR before we register. Cc: "David S. Miller" <davem@davemloft.net> Cc: Andy King <acking@vmware.com> Cc: Dmitry Torokhov <dtor@vmware.com> Cc: Reilly Grant <grantr@vmware.com> Cc: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Asias He <asias@redhat.com> Acked-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-04-07Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
Conflicts: drivers/nfc/microread/mei.c net/netfilter/nfnetlink_queue_core.c Pull in 'net' to get Eric Biederman's AF_UNIX fix, upon which some cleanups are going to go on-top. Signed-off-by: David S. Miller <davem@davemloft.net>
2013-04-07VSOCK: Fix missing msg_namelen update in vsock_stream_recvmsg()Mathias Krause
The code misses to update the msg_namelen member to 0 and therefore makes net/socket.c leak the local, uninitialized sockaddr_storage variable to userland -- 128 bytes of kernel stack memory. Cc: Andy King <acking@vmware.com> Cc: Dmitry Torokhov <dtor@vmware.com> Cc: George Zhang <georgezhang@vmware.com> Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-04-07VSOCK: vmci - fix possible info leak in vmci_transport_dgram_dequeue()Mathias Krause
In case we received no data on the call to skb_recv_datagram(), i.e. skb->data is NULL, vmci_transport_dgram_dequeue() will return with 0 without updating msg_namelen leading to net/socket.c leaking the local, uninitialized sockaddr_storage variable to userland -- 128 bytes of kernel stack memory. Fix this by moving the already existing msg_namelen assignment a few lines above. Cc: Andy King <acking@vmware.com> Cc: Dmitry Torokhov <dtor@vmware.com> Cc: George Zhang <georgezhang@vmware.com> Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-04-03Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
Pull net into net-next to get the synchronize_net() bug fix in bonding. Signed-off-by: David S. Miller <davem@davemloft.net>
2013-04-02VSOCK: Handle changes to the VMCI context ID.Reilly Grant
The VMCI context ID of a virtual machine may change at any time. There is a VMCI event which signals this but datagrams may be processed before this is handled. It is therefore necessary to be flexible about the destination context ID of any datagrams received. (It can be assumed to be correct because it is provided by the hypervisor.) The context ID on existing sockets should be updated to reflect how the hypervisor is currently referring to the system. Signed-off-by: Reilly Grant <grantr@vmware.com> Acked-by: Andy King <acking@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-03-15VSOCK: Support VM sockets connected to the hypervisor.Reilly Grant
The resource ID used for VM socket control packets (0) is already used for the VMCI_GET_CONTEXT_ID hypercall so a new ID (15) must be used when the guest sends these datagrams to the hypervisor. The hypervisor context ID must also be removed from the internal blacklist. Signed-off-by: Reilly Grant <grantr@vmware.com> Acked-by: Andy King <acking@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-02-18VSOCK: Don't reject PF_VSOCK protocolAndy King
Allow our own family as the protocol value for socket creation. Reported-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Andy King <acking@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-02-18VSOCK: get rid of vsock_version.hDmitry Torokhov
There isn't really a need to have a separate file for it. Acked-by: Andy King <acking@vmware.com> Signed-off-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-02-18VSOCK: get rid of EXPORT_SYMTABDmitry Torokhov
This is the default behavior for a looooooong time. Acked-by: Andy King <acking@vmware.com> Signed-off-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-02-11VSOCK: Introduce VM SocketsAndy King
VM Sockets allows communication between virtual machines and the hypervisor. User level applications both in a virtual machine and on the host can use the VM Sockets API, which facilitates fast and efficient communication between guest virtual machines and their host. A socket address family, designed to be compatible with UDP and TCP at the interface level, is provided. Today, VM Sockets is used by various VMware Tools components inside the guest for zero-config, network-less access to VMware host services. In addition to this, VMware's users are using VM Sockets for various applications, where network access of the virtual machine is restricted or non-existent. Examples of this are VMs communicating with device proxies for proprietary hardware running as host applications and automated testing of applications running within virtual machines. The VMware VM Sockets are similar to other socket types, like Berkeley UNIX socket interface. The VM Sockets module supports both connection-oriented stream sockets like TCP, and connectionless datagram sockets like UDP. The VM Sockets protocol family is defined as "AF_VSOCK" and the socket operations split for SOCK_DGRAM and SOCK_STREAM. For additional information about the use of VM Sockets, please refer to the VM Sockets Programming Guide available at: https://www.vmware.com/support/developer/vmci-sdk/ Signed-off-by: George Zhang <georgezhang@vmware.com> Signed-off-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: Andy king <acking@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>