1. 05 Jul, 2016 1 commit
  2. 23 May, 2016 1 commit
    • Stefan Hajnoczi's avatar
      net/atm: sk_err_soft must be positive · c685293a
      Stefan Hajnoczi authored
      The sk_err and sk_err_soft fields are positive errno values and
      userspace applications rely on this when using getsockopt(SO_ERROR).
      
      ATM code places an -errno into sk_err_soft in sigd_send() and returns it
      from svc_addparty()/svc_dropparty().
      
      Although I am not familiar with ATM code I came to this conclusion
      because:
      
      1. sigd_send() msg->type cases as_okay and as_error both have:
      
         sk->sk_err = -msg->reply;
      
         while the as_addparty and as_dropparty cases have:
      
         sk->sk_err_soft = msg->reply;
      
         This is the source of the inconsistency.
      
      2. svc_addparty() returns an -errno and assumes sk_err_soft is also an
         -errno:
      
             if (flags & O_NONBLOCK) {
                 error = -EINPROGRESS;
                 goto out;
             }
             ...
             error = xchg(&sk->sk_err_soft, 0);
         out:
             release_sock(sk);
             return error;
      
         This shows that sk_err_soft is indeed being treated as an -errno.
      
      This patch ensures that sk_err_soft is always a positive errno.
      Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c685293a
  3. 04 May, 2016 1 commit
  4. 30 Nov, 2015 1 commit
  5. 23 Nov, 2015 1 commit
  6. 17 Sep, 2015 1 commit
    • Sasha Levin's avatar
      atm: deal with setting entry before mkip was called · 34f5b006
      Sasha Levin authored
      If we didn't call ATMARP_MKIP before ATMARP_ENCAP the VCC descriptor is
      non-existant and we'll end up dereferencing a NULL ptr:
      
      [1033173.491930] kasan: GPF could be caused by NULL-ptr deref or user memory accessirq event stamp: 123386
      [1033173.493678] general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN
      [1033173.493689] Modules linked in:
      [1033173.493697] CPU: 9 PID: 23815 Comm: trinity-c64 Not tainted 4.2.0-next-20150911-sasha-00043-g353d875-dirty #2545
      [1033173.493706] task: ffff8800630c4000 ti: ffff880063110000 task.ti: ffff880063110000
      [1033173.493823] RIP: clip_ioctl (net/atm/clip.c:320 net/atm/clip.c:689)
      [1033173.493826] RSP: 0018:ffff880063117a88  EFLAGS: 00010203
      [1033173.493828] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 000000000000000c
      [1033173.493830] RDX: 0000000000000002 RSI: ffffffffb3f10720 RDI: 0000000000000014
      [1033173.493832] RBP: ffff880063117b80 R08: ffff88047574d9a4 R09: 0000000000000000
      [1033173.493834] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1000c622f53
      [1033173.493836] R13: ffff8800cb905500 R14: ffff8808d6da2000 R15: 00000000fffffdfd
      [1033173.493840] FS:  00007fa56b92d700(0000) GS:ffff880478000000(0000) knlGS:0000000000000000
      [1033173.493843] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
      [1033173.493845] CR2: 0000000000000000 CR3: 00000000630e8000 CR4: 00000000000006a0
      [1033173.493855] Stack:
      [1033173.493862]  ffffffffb0b60444 000000000000eaea 0000000041b58ab3 ffffffffb3c3ce32
      [1033173.493867]  ffffffffb0b6f3e0 ffffffffb0b60444 ffffffffb5ea2e50 1ffff1000c622f5e
      [1033173.493873]  ffff8800630c4cd8 00000000000ee09a ffffffffb3ec4888 ffffffffb5ea2de8
      [1033173.493874] Call Trace:
      [1033173.494108] do_vcc_ioctl (net/atm/ioctl.c:170)
      [1033173.494113] vcc_ioctl (net/atm/ioctl.c:189)
      [1033173.494116] svc_ioctl (net/atm/svc.c:605)
      [1033173.494200] sock_do_ioctl (net/socket.c:874)
      [1033173.494204] sock_ioctl (net/socket.c:958)
      [1033173.494244] do_vfs_ioctl (fs/ioctl.c:43 fs/ioctl.c:607)
      [1033173.494290] SyS_ioctl (fs/ioctl.c:622 fs/ioctl.c:613)
      [1033173.494295] entry_SYSCALL_64_fastpath (arch/x86/entry/entry_64.S:186)
      [1033173.494362] Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 50 09 00 00 49 8b 9e 60 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 14 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 14 09 00
      All code
      
      ========
         0:   fa                      cli
         1:   48 c1 ea 03             shr    $0x3,%rdx
         5:   80 3c 02 00             cmpb   $0x0,(%rdx,%rax,1)
         9:   0f 85 50 09 00 00       jne    0x95f
         f:   49 8b 9e 60 06 00 00    mov    0x660(%r14),%rbx
        16:   48 b8 00 00 00 00 00    movabs $0xdffffc0000000000,%rax
        1d:   fc ff df
        20:   48 8d 7b 14             lea    0x14(%rbx),%rdi
        24:   48 89 fa                mov    %rdi,%rdx
        27:   48 c1 ea 03             shr    $0x3,%rdx
        2b:*  0f b6 04 02             movzbl (%rdx,%rax,1),%eax               <-- trapping instruction
        2f:   48 89 fa                mov    %rdi,%rdx
        32:   83 e2 07                and    $0x7,%edx
        35:   38 d0                   cmp    %dl,%al
        37:   7f 08                   jg     0x41
        39:   84 c0                   test   %al,%al
        3b:   0f 85 14 09 00 00       jne    0x955
      
      Code starting with the faulting instruction
      ===========================================
         0:   0f b6 04 02             movzbl (%rdx,%rax,1),%eax
         4:   48 89 fa                mov    %rdi,%rdx
         7:   83 e2 07                and    $0x7,%edx
         a:   38 d0                   cmp    %dl,%al
         c:   7f 08                   jg     0x16
         e:   84 c0                   test   %al,%al
        10:   0f 85 14 09 00 00       jne    0x92a
      [1033173.494366] RIP clip_ioctl (net/atm/clip.c:320 net/atm/clip.c:689)
      [1033173.494368]  RSP <ffff880063117a88>
      Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      34f5b006
  7. 31 Jul, 2015 1 commit
  8. 11 May, 2015 1 commit
  9. 06 Mar, 2015 1 commit
  10. 03 Mar, 2015 2 commits
  11. 02 Mar, 2015 1 commit
  12. 09 Dec, 2014 1 commit
    • Al Viro's avatar
      put iov_iter into msghdr · c0371da6
      Al Viro authored
      Note that the code _using_ ->msg_iter at that point will be very
      unhappy with anything other than unshifted iovec-backed iov_iter.
      We still need to convert users to proper primitives.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      c0371da6
  13. 24 Nov, 2014 1 commit
  14. 05 Nov, 2014 1 commit
    • David S. Miller's avatar
      net: Add and use skb_copy_datagram_msg() helper. · 51f3d02b
      David S. Miller authored
      This encapsulates all of the skb_copy_datagram_iovec() callers
      with call argument signature "skb, offset, msghdr->msg_iov, length".
      
      When we move to iov_iters in the networking, the iov_iter object will
      sit in the msghdr.
      
      Having a helper like this means there will be less places to touch
      during that transformation.
      
      Based upon descriptions and patch from Al Viro.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      51f3d02b
  15. 07 Oct, 2014 1 commit
    • Eric Dumazet's avatar
      net: better IFF_XMIT_DST_RELEASE support · 02875878
      Eric Dumazet authored
      Testing xmit_more support with netperf and connected UDP sockets,
      I found strange dst refcount false sharing.
      
      Current handling of IFF_XMIT_DST_RELEASE is not optimal.
      
      Dropping dst in validate_xmit_skb() is certainly too late in case
      packet was queued by cpu X but dequeued by cpu Y
      
      The logical point to take care of drop/force is in __dev_queue_xmit()
      before even taking qdisc lock.
      
      As Julian Anastasov pointed out, need for skb_dst() might come from some
      packet schedulers or classifiers.
      
      This patch adds new helper to cleanly express needs of various drivers
      or qdiscs/classifiers.
      
      Drivers that need skb_dst() in their ndo_start_xmit() should call
      following helper in their setup instead of the prior :
      
      	dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
      ->
      	netif_keep_dst(dev);
      
      Instead of using a single bit, we use two bits, one being
      eventually rebuilt in bonding/team drivers.
      
      The other one, is permanent and blocks IFF_XMIT_DST_RELEASE being
      rebuilt in bonding/team. Eventually, we could add something
      smarter later.
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Cc: Julian Anastasov <ja@ssi.bg>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      02875878
  16. 10 Sep, 2014 1 commit
  17. 01 Sep, 2014 1 commit
  18. 25 Aug, 2014 1 commit
  19. 21 Aug, 2014 1 commit
  20. 13 Aug, 2014 2 commits
  21. 15 Jul, 2014 1 commit
    • Tom Gundersen's avatar
      net: set name_assign_type in alloc_netdev() · c835a677
      Tom Gundersen authored
      Extend alloc_netdev{,_mq{,s}}() to take name_assign_type as argument, and convert
      all users to pass NET_NAME_UNKNOWN.
      
      Coccinelle patch:
      
      @@
      expression sizeof_priv, name, setup, txqs, rxqs, count;
      @@
      
      (
      -alloc_netdev_mqs(sizeof_priv, name, setup, txqs, rxqs)
      +alloc_netdev_mqs(sizeof_priv, name, NET_NAME_UNKNOWN, setup, txqs, rxqs)
      |
      -alloc_netdev_mq(sizeof_priv, name, setup, count)
      +alloc_netdev_mq(sizeof_priv, name, NET_NAME_UNKNOWN, setup, count)
      |
      -alloc_netdev(sizeof_priv, name, setup)
      +alloc_netdev(sizeof_priv, name, NET_NAME_UNKNOWN, setup)
      )
      
      v9: move comments here from the wrong commit
      Signed-off-by: default avatarTom Gundersen <teg@jklm.no>
      Reviewed-by: default avatarDavid Herrmann <dh.herrmann@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c835a677
  22. 30 May, 2014 1 commit
  23. 18 Apr, 2014 1 commit
  24. 11 Apr, 2014 1 commit
    • David S. Miller's avatar
      net: Fix use after free by removing length arg from sk_data_ready callbacks. · 676d2369
      David S. Miller authored
      Several spots in the kernel perform a sequence like:
      
      	skb_queue_tail(&sk->s_receive_queue, skb);
      	sk->sk_data_ready(sk, skb->len);
      
      But at the moment we place the SKB onto the socket receive queue it
      can be consumed and freed up.  So this skb->len access is potentially
      to freed up memory.
      
      Furthermore, the skb->len can be modified by the consumer so it is
      possible that the value isn't accurate.
      
      And finally, no actual implementation of this callback actually uses
      the length argument.  And since nobody actually cared about it's
      value, lots of call sites pass arbitrary values in such as '0' and
      even '1'.
      
      So just remove the length argument from the callback, that way there
      is no confusion whatsoever and all of these use-after-free cases get
      fixed as a side effect.
      
      Based upon a patch by Eric Dumazet and his suggestion to audit this
      issue tree-wide.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      676d2369
  25. 27 Mar, 2014 1 commit
  26. 21 Jan, 2014 2 commits
    • David S. Miller's avatar
      net: Fix some fallout from the etner_addr_copy() changes. · 9be68c1a
      David S. Miller authored
      net/appletalk/aarp.c: In function ‘__aarp_send_query’:
      net/appletalk/aarp.c:137:2: error: implicit declaration of function ‘ether_addr_copy’ [-Werror=implicit-function-declaration]
       ...
      net/atm/lec.c: In function ‘send_to_lecd’:
      net/atm/lec.c:524:3: warning: passing argument 1 of ‘ether_addr_copy’ from incompatible pointer type [enabled by default]
      In file included from net/atm/lec.c:17:0:
      include/linux/etherdevice.h:227:20: note: expected ‘u8 *’ but argument is of type ‘unsigned char (*)[6]’
       ...
      net/caif/caif_usb.c: In function ‘cfusbl_create’:
      net/caif/caif_usb.c:108:2: error: implicit declaration of function ‘ether_addr_copy’ [-Werror=implicit-function-declaration]
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9be68c1a
    • Joe Perches's avatar
      atm: Use ether_addr_copy · 116e853f
      Joe Perches authored
      Use ether_addr_copy instead of memcpy(a, b, ETH_ALEN) to
      save some cycles on arm and powerpc.
      Signed-off-by: default avatarJoe Perches <joe@perches.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      116e853f
  27. 20 Nov, 2013 1 commit
    • Hannes Frederic Sowa's avatar
      net: rework recvmsg handler msg_name and msg_namelen logic · f3d33426
      Hannes Frederic Sowa authored
      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: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f3d33426
  28. 28 May, 2013 2 commits
  29. 09 Apr, 2013 1 commit
    • Al Viro's avatar
      procfs: new helper - PDE_DATA(inode) · d9dda78b
      Al Viro authored
      The only part of proc_dir_entry the code outside of fs/proc
      really cares about is PDE(inode)->data.  Provide a helper
      for that; static inline for now, eventually will be moved
      to fs/proc, along with the knowledge of struct proc_dir_entry
      layout.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      d9dda78b
  30. 07 Apr, 2013 1 commit
  31. 27 Mar, 2013 1 commit
    • Simon Horman's avatar
      net: add ETH_P_802_3_MIN · e5c5d22e
      Simon Horman authored
      Add a new constant ETH_P_802_3_MIN, the minimum ethernet type for
      an 802.3 frame. Frames with a lower value in the ethernet type field
      are Ethernet II.
      
      Also update all the users of this value that David Miller and
      I could find to use the new constant.
      
      Also correct a bug in util.c. The comparison with ETH_P_802_3_MIN
      should be >= not >.
      
      As suggested by Jesse Gross.
      
      Compile tested only.
      
      Cc: David Miller <davem@davemloft.net>
      Cc: Jesse Gross <jesse@nicira.com>
      Cc: Karsten Keil <isdn@linux-pingi.de>
      Cc: John W. Linville <linville@tuxdriver.com>
      Cc: Johannes Berg <johannes@sipsolutions.net>
      Cc: Bart De Schuymer <bart.de.schuymer@pandora.be>
      Cc: Stephen Hemminger <stephen@networkplumber.org>
      Cc: Patrick McHardy <kaber@trash.net>
      Cc: Marcel Holtmann <marcel@holtmann.org>
      Cc: Gustavo Padovan <gustavo@padovan.org>
      Cc: Johan Hedberg <johan.hedberg@gmail.com>
      Cc: linux-bluetooth@vger.kernel.org
      Cc: netfilter-devel@vger.kernel.org
      Cc: bridge@lists.linux-foundation.org
      Cc: linux-wireless@vger.kernel.org
      Cc: linux1394-devel@lists.sourceforge.net
      Cc: linux-media@vger.kernel.org
      Cc: netdev@vger.kernel.org
      Cc: dev@openvswitch.org
      Acked-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
      Acked-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
      Signed-off-by: default avatarSimon Horman <horms@verge.net.au>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e5c5d22e
  32. 27 Feb, 2013 1 commit
    • Sasha Levin's avatar
      hlist: drop the node parameter from iterators · b67bfe0d
      Sasha Levin authored
      I'm not sure why, but the hlist for each entry iterators were conceived
      
              list_for_each_entry(pos, head, member)
      
      The hlist ones were greedy and wanted an extra parameter:
      
              hlist_for_each_entry(tpos, pos, head, member)
      
      Why did they need an extra pos parameter? I'm not quite sure. Not only
      they don't really need it, it also prevents the iterator from looking
      exactly like the list iterator, which is unfortunate.
      
      Besides the semantic patch, there was some manual work required:
      
       - Fix up the actual hlist iterators in linux/list.h
       - Fix up the declaration of other iterators based on the hlist ones.
       - A very small amount of places were using the 'node' parameter, this
       was modified to use 'obj->member' instead.
       - Coccinelle didn't handle the hlist_for_each_entry_safe iterator
       properly, so those had to be fixed up manually.
      
      The semantic patch which is mostly the work of Peter Senna Tschudin is here:
      
      @@
      iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host;
      
      type T;
      expression a,c,d,e;
      identifier b;
      statement S;
      @@
      
      -T b;
          <+... when != b
      (
      hlist_for_each_entry(a,
      - b,
      c, d) S
      |
      hlist_for_each_entry_continue(a,
      - b,
      c) S
      |
      hlist_for_each_entry_from(a,
      - b,
      c) S
      |
      hlist_for_each_entry_rcu(a,
      - b,
      c, d) S
      |
      hlist_for_each_entry_rcu_bh(a,
      - b,
      c, d) S
      |
      hlist_for_each_entry_continue_rcu_bh(a,
      - b,
      c) S
      |
      for_each_busy_worker(a, c,
      - b,
      d) S
      |
      ax25_uid_for_each(a,
      - b,
      c) S
      |
      ax25_for_each(a,
      - b,
      c) S
      |
      inet_bind_bucket_for_each(a,
      - b,
      c) S
      |
      sctp_for_each_hentry(a,
      - b,
      c) S
      |
      sk_for_each(a,
      - b,
      c) S
      |
      sk_for_each_rcu(a,
      - b,
      c) S
      |
      sk_for_each_from
      -(a, b)
      +(a)
      S
      + sk_for_each_from(a) S
      |
      sk_for_each_safe(a,
      - b,
      c, d) S
      |
      sk_for_each_bound(a,
      - b,
      c) S
      |
      hlist_for_each_entry_safe(a,
      - b,
      c, d, e) S
      |
      hlist_for_each_entry_continue_rcu(a,
      - b,
      c) S
      |
      nr_neigh_for_each(a,
      - b,
      c) S
      |
      nr_neigh_for_each_safe(a,
      - b,
      c, d) S
      |
      nr_node_for_each(a,
      - b,
      c) S
      |
      nr_node_for_each_safe(a,
      - b,
      c, d) S
      |
      - for_each_gfn_sp(a, c, d, b) S
      + for_each_gfn_sp(a, c, d) S
      |
      - for_each_gfn_indirect_valid_sp(a, c, d, b) S
      + for_each_gfn_indirect_valid_sp(a, c, d) S
      |
      for_each_host(a,
      - b,
      c) S
      |
      for_each_host_safe(a,
      - b,
      c, d) S
      |
      for_each_mesh_entry(a,
      - b,
      c, d) S
      )
          ...+>
      
      [akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c]
      [akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c]
      [akpm@linux-foundation.org: checkpatch fixes]
      [akpm@linux-foundation.org: fix warnings]
      [akpm@linux-foudnation.org: redo intrusive kvm changes]
      Tested-by: default avatarPeter Senna Tschudin <peter.senna@gmail.com>
      Acked-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
      Cc: Wu Fengguang <fengguang.wu@intel.com>
      Cc: Marcelo Tosatti <mtosatti@redhat.com>
      Cc: Gleb Natapov <gleb@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b67bfe0d
  33. 22 Feb, 2013 1 commit
  34. 18 Feb, 2013 1 commit
  35. 17 Dec, 2012 1 commit
  36. 01 Dec, 2012 1 commit