Eric Lee / smarc-fsl-linux-kernel

10 Jan, 2012

1 commit

  • 38e5781bb   Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net ... Browse Code »

    * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
    igmp: Avoid zero delay when receiving odd mixture of IGMP queries
    netdev: make net_device_ops const
    bcm63xx: make ethtool_ops const
    usbnet: make ethtool_ops const
    net: Fix build with INET disabled.
    net: introduce netif_addr_lock_nested() and call if when appropriate
    net: correct lock name in dev_[uc/mc]_sync documentations.
    net: sk_update_clone is only used in net/core/sock.c
    8139cp: fix missing napi_gro_flush.
    pktgen: set correct max and min in pktgen_setup_inject()
    smsc911x: Unconditionally include linux/smscphy.h in smsc911x.h
    asix: fix infinite loop in rx_fixup()
    net: Default UDP and UNIX diag to 'n'.
    r6040: fix typo in use of MCR0 register bits
    net: fix sock_clone reference mismatch with tcp memcontrol

    Linus Torvalds
     

09 Jan, 2012

1 commit

  • 972b2c719   Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs ... Browse Code »

    * 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (165 commits)
    reiserfs: Properly display mount options in /proc/mounts
    vfs: prevent remount read-only if pending removes
    vfs: count unlinked inodes
    vfs: protect remounting superblock read-only
    vfs: keep list of mounts for each superblock
    vfs: switch ->show_options() to struct dentry *
    vfs: switch ->show_path() to struct dentry *
    vfs: switch ->show_devname() to struct dentry *
    vfs: switch ->show_stats to struct dentry *
    switch security_path_chmod() to struct path *
    vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb
    vfs: trim includes a bit
    switch mnt_namespace ->root to struct mount
    vfs: take /proc/*/mounts and friends to fs/proc_namespace.c
    vfs: opencode mntget() mnt_set_mountpoint()
    vfs: spread struct mount - remaining argument of next_mnt()
    vfs: move fsnotify junk to struct mount
    vfs: move mnt_devname
    vfs: move mnt_list to struct mount
    vfs: switch pnode.h macros to struct mount *
    ...

    Linus Torvalds
     

08 Jan, 2012

1 commit

04 Jan, 2012

1 commit

31 Dec, 2011

3 commits

27 Dec, 2011

2 commits

21 Dec, 2011

1 commit

  • 2ea744a58   net: unix -- Add missing module.h inclusion ... Browse Code »

    Otherwise getting

    | net/unix/diag.c:312:16: error: expected declaration specifiers or ‘...’ before string constant
    | net/unix/diag.c:313:1: error: expected declaration specifiers or ‘...’ before string constant

    Signed-off-by: Cyrill Gorcunov
    Signed-off-by: David S. Miller

    Cyrill Gorcunov
     

17 Dec, 2011

10 commits

27 Nov, 2011

1 commit

29 Sep, 2011

1 commit

  • 16e572626   af_unix: dont send SCM_CREDENTIALS by default ... Browse Code »
    44

    Since commit 7361c36c5224 (af_unix: Allow credentials to work across
    user and pid namespaces) af_unix performance dropped a lot.

    This is because we now take a reference on pid and cred in each write(),
    and release them in read(), usually done from another process,
    eventually from another cpu. This triggers false sharing.

    # Events: 154K cycles
    #
    # Overhead Command Shared Object Symbol
    # ........ ....... .................. .........................
    #
    10.40% hackbench [kernel.kallsyms] [k] put_pid
    8.60% hackbench [kernel.kallsyms] [k] unix_stream_recvmsg
    7.87% hackbench [kernel.kallsyms] [k] unix_stream_sendmsg
    6.11% hackbench [kernel.kallsyms] [k] do_raw_spin_lock
    4.95% hackbench [kernel.kallsyms] [k] unix_scm_to_skb
    4.87% hackbench [kernel.kallsyms] [k] pid_nr_ns
    4.34% hackbench [kernel.kallsyms] [k] cred_to_ucred
    2.39% hackbench [kernel.kallsyms] [k] unix_destruct_scm
    2.24% hackbench [kernel.kallsyms] [k] sub_preempt_count
    1.75% hackbench [kernel.kallsyms] [k] fget_light
    1.51% hackbench [kernel.kallsyms] [k]
    __mutex_lock_interruptible_slowpath
    1.42% hackbench [kernel.kallsyms] [k] sock_alloc_send_pskb

    This patch includes SCM_CREDENTIALS information in a af_unix message/skb
    only if requested by the sender, [man 7 unix for details how to include
    ancillary data using sendmsg() system call]

    Note: This might break buggy applications that expected SCM_CREDENTIAL
    from an unaware write() system call, and receiver not using SO_PASSCRED
    socket option.

    If SOCK_PASSCRED is set on source or destination socket, we still
    include credentials for mere write() syscalls.

    Performance boost in hackbench : more than 50% gain on a 16 thread
    machine (2 quad-core cpus, 2 threads per core)

    hackbench 20 thread 2000

    4.228 sec instead of 9.102 sec

    Signed-off-by: Eric Dumazet
    Acked-by: Tim Chen
    Signed-off-by: David S. Miller

    Eric Dumazet
     

17 Sep, 2011

1 commit

25 Aug, 2011

1 commit

  • 0856a3040   Scm: Remove unnecessary pid & credential references in Unix socket's send and receive path ... Browse Code »

    Patch series 109f6e39..7361c36c back in 2.6.36 added functionality to
    allow credentials to work across pid namespaces for packets sent via
    UNIX sockets. However, the atomic reference counts on pid and
    credentials caused plenty of cache bouncing when there are numerous
    threads of the same pid sharing a UNIX socket. This patch mitigates the
    problem by eliminating extraneous reference counts on pid and
    credentials on both send and receive path of UNIX sockets. I found a 2x
    improvement in hackbench's threaded case.

    On the receive path in unix_dgram_recvmsg, currently there is an
    increment of reference count on pid and credentials in scm_set_cred.
    Then there are two decrement of the reference counts. Once in scm_recv
    and once when skb_free_datagram call skb->destructor function
    unix_destruct_scm. One pair of increment and decrement of ref count on
    pid and credentials can be eliminated from the receive path. Until we
    destroy the skb, we already set a reference when we created the skb on
    the send side.

    On the send path, there are two increments of ref count on pid and
    credentials, once in scm_send and once in unix_scm_to_skb. Then there
    is a decrement of the reference counts in scm_destroy's call to
    scm_destroy_cred at the end of unix_dgram_sendmsg functions. One pair
    of increment and decrement of the reference counts can be removed so we
    only need to increment the ref counts once.

    By incorporating these changes, for hackbench running on a 4 socket
    NHM-EX machine with 40 cores, the execution of hackbench on
    50 groups of 20 threads sped up by factor of 2.

    Hackbench command used for testing:
    ./hackbench 50 thread 2000

    Signed-off-by: Tim Chen
    Signed-off-by: David S. Miller

    Tim Chen
     

20 Jul, 2011

1 commit

24 May, 2011

1 commit

  • 71338aa7d   net: convert %p usage to %pK ... Browse Code »

    The %pK format specifier is designed to hide exposed kernel pointers,
    specifically via /proc interfaces. Exposing these pointers provides an
    easy target for kernel write vulnerabilities, since they reveal the
    locations of writable structures containing easily triggerable function
    pointers. The behavior of %pK depends on the kptr_restrict sysctl.

    If kptr_restrict is set to 0, no deviation from the standard %p behavior
    occurs. If kptr_restrict is set to 1, the default, if the current user
    (intended to be a reader via seq_printf(), etc.) does not have CAP_SYSLOG
    (currently in the LSM tree), kernel pointers using %pK are printed as 0's.
    If kptr_restrict is set to 2, kernel pointers using %pK are printed as
    0's regardless of privileges. Replacing with 0's was chosen over the
    default "(null)", which cannot be parsed by userland %p, which expects
    "(nil)".

    The supporting code for kptr_restrict and %pK are currently in the -mm
    tree. This patch converts users of %p in net/ to %pK. Cases of printing
    pointers to the syslog are not covered, since this would eliminate useful
    information for postmortem debugging and the reading of the syslog is
    already optionally protected by the dmesg_restrict sysctl.

    Signed-off-by: Dan Rosenberg
    Cc: James Morris
    Cc: Eric Dumazet
    Cc: Thomas Graf
    Cc: Eugene Teo
    Cc: Kees Cook
    Cc: Ingo Molnar
    Cc: David S. Miller
    Cc: Peter Zijlstra
    Cc: Eric Paris
    Signed-off-by: Andrew Morton
    Signed-off-by: David S. Miller

    Dan Rosenberg
     

02 May, 2011

1 commit

  • a05d2ad1c   af_unix: Only allow recv on connected seqpacket sockets. ... Browse Code »

    This fixes the following oops discovered by Dan Aloni:
    > Anyway, the following is the output of the Oops that I got on the
    > Ubuntu kernel on which I first detected the problem
    > (2.6.37-12-generic). The Oops that followed will be more useful, I
    > guess.

    >[ 5594.669852] BUG: unable to handle kernel NULL pointer dereference
    > at           (null)
    > [ 5594.681606] IP: [] unix_dgram_recvmsg+0x1fb/0x420
    > [ 5594.687576] PGD 2a05d067 PUD 2b951067 PMD 0
    > [ 5594.693720] Oops: 0002 [#1] SMP
    > [ 5594.699888] last sysfs file:

    The bug was that unix domain sockets use a pseduo packet for
    connecting and accept uses that psudo packet to get the socket.
    In the buggy seqpacket case we were allowing unconnected
    sockets to call recvmsg and try to receive the pseudo packet.

    That is always wrong and as of commit 7361c36c5 the pseudo
    packet had become enough different from a normal packet
    that the kernel started oopsing.

    Do for seqpacket_recv what was done for seqpacket_send in 2.5
    and only allow it on connected seqpacket sockets.

    Cc: stable@kernel.org
    Tested-by: Dan Aloni
    Signed-off-by: Eric W. Biederman
    Signed-off-by: David S. Miller

    Eric W. Biederman
     

31 Mar, 2011

1 commit

17 Mar, 2011

1 commit

  • 7a6362800   Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 ... Browse Code »

    * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6: (1480 commits)
    bonding: enable netpoll without checking link status
    xfrm: Refcount destination entry on xfrm_lookup
    net: introduce rx_handler results and logic around that
    bonding: get rid of IFF_SLAVE_INACTIVE netdev->priv_flag
    bonding: wrap slave state work
    net: get rid of multiple bond-related netdevice->priv_flags
    bonding: register slave pointer for rx_handler
    be2net: Bump up the version number
    be2net: Copyright notice change. Update to Emulex instead of ServerEngines
    e1000e: fix kconfig for crc32 dependency
    netfilter ebtables: fix xt_AUDIT to work with ebtables
    xen network backend driver
    bonding: Improve syslog message at device creation time
    bonding: Call netif_carrier_off after register_netdevice
    bonding: Incorrect TX queue offset
    net_sched: fix ip_tos2prio
    xfrm: fix __xfrm_route_forward()
    be2net: Fix UDP packet detected status in RX compl
    Phonet: fix aligned-mode pipe socket buffer header reserve
    netxen: support for GbE port settings
    ...

    Fix up conflicts in drivers/staging/brcm80211/brcmsmac/wl_mac80211.c
    with the staging updates.

    Linus Torvalds
     

16 Mar, 2011

2 commits

  • 422e6c4bc   Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 ... Browse Code »

    * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (57 commits)
    tidy the trailing symlinks traversal up
    Turn resolution of trailing symlinks iterative everywhere
    simplify link_path_walk() tail
    Make trailing symlink resolution in path_lookupat() iterative
    update nd->inode in __do_follow_link() instead of after do_follow_link()
    pull handling of one pathname component into a helper
    fs: allow AT_EMPTY_PATH in linkat(), limit that to CAP_DAC_READ_SEARCH
    Allow passing O_PATH descriptors via SCM_RIGHTS datagrams
    readlinkat(), fchownat() and fstatat() with empty relative pathnames
    Allow O_PATH for symlinks
    New kind of open files - "location only".
    ext4: Copy fs UUID to superblock
    ext3: Copy fs UUID to superblock.
    vfs: Export file system uuid via /proc//mountinfo
    unistd.h: Add new syscalls numbers to asm-generic
    x86: Add new syscalls for x86_64
    x86: Add new syscalls for x86_32
    fs: Remove i_nlink check from file system link callback
    fs: Don't allow to create hardlink for deleted file
    vfs: Add open by file handle support
    ...

    Linus Torvalds
     
  • c337ffb68   Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Browse Code »
    David S. Miller
     

15 Mar, 2011

2 commits

14 Mar, 2011

1 commit

11 Mar, 2011

1 commit

08 Mar, 2011

2 commits

  • 6118e35a7   af_unix: remove unused struct sockaddr_un cruft ... Browse Code »

    Signed-off-by: Hagen Paul Pfeifer
    Signed-off-by: David S. Miller

    Hagen Paul Pfeifer
     
  • b3ca9b02b   net: fix multithreaded signal handling in unix recv routines ... Browse Code »

    The unix_dgram_recvmsg and unix_stream_recvmsg routines in
    net/af_unix.c utilize mutex_lock(&u->readlock) calls in order to
    serialize read operations of multiple threads on a single socket. This
    implies that, if all n threads of a process block in an AF_UNIX recv
    call trying to read data from the same socket, one of these threads
    will be sleeping in state TASK_INTERRUPTIBLE and all others in state
    TASK_UNINTERRUPTIBLE. Provided that a particular signal is supposed to
    be handled by a signal handler defined by the process and that none of
    this threads is blocking the signal, the complete_signal routine in
    kernel/signal.c will select the 'first' such thread it happens to
    encounter when deciding which thread to notify that a signal is
    supposed to be handled and if this is one of the TASK_UNINTERRUPTIBLE
    threads, the signal won't be handled until the one thread not blocking
    on the u->readlock mutex is woken up because some data to process has
    arrived (if this ever happens). The included patch fixes this by
    changing mutex_lock to mutex_lock_interruptible and handling possible
    error returns in the same way interruptions are handled by the actual
    receive-code.

    Signed-off-by: Rainer Weikusat
    Signed-off-by: David S. Miller

    Rainer Weikusat
     

23 Feb, 2011

1 commit

20 Jan, 2011

1 commit

19 Jan, 2011

1 commit

  • d6ae3bae3   af_unix: implement socket filter ... Browse Code »

    Linux Socket Filters can already be successfully attached and detached on unix
    sockets with setsockopt(sockfd, SOL_SOCKET, SO_{ATTACH,DETACH}_FILTER, ...).
    See: Documentation/networking/filter.txt

    But the filter was never used in the unix socket code so it did not work. This
    patch uses sk_filter() to filter buffers before delivery.

    This short program demonstrates the problem on SOCK_DGRAM.

    int main(void) {
    int i, j, ret;
    int sv[2];
    struct pollfd fds[2];
    char *message = "Hello world!";
    char buffer[64];
    struct sock_filter ins[32] = {{0,},};
    struct sock_fprog filter;

    socketpair(AF_UNIX, SOCK_DGRAM, 0, sv);

    for (i = 0 ; i < 2 ; i++) {
    fds[i].fd = sv[i];
    fds[i].events = POLLIN;
    fds[i].revents = 0;
    }

    for(j = 1 ; j < 13 ; j++) {

    /* Set a socket filter to truncate the message */
    memset(ins, 0, sizeof(ins));
    ins[0].code = BPF_RET|BPF_K;
    ins[0].k = j;
    filter.len = 1;
    filter.filter = ins;
    setsockopt(sv[1], SOL_SOCKET, SO_ATTACH_FILTER, &filter, sizeof(filter));

    /* send a message */
    send(sv[0], message, strlen(message) + 1, 0);

    /* The filter should let the message pass but truncated. */
    poll(fds, 2, 0);

    /* Receive the truncated message*/
    ret = recv(sv[1], buffer, 64, 0);
    printf("received %d bytes, expected %d\n", ret, j);
    }

    for (i = 0 ; i < 2 ; i++)
    close(sv[i]);

    return 0;
    }

    Signed-off-by: Alban Crequy
    Reviewed-by: Ian Molton
    Signed-off-by: David S. Miller

    Alban Crequy