1. 02 Oct, 2019 3 commits
    • Eric Dumazet's avatar
      tcp: adjust rto_base in retransmits_timed_out() · 3256a2d6
      Eric Dumazet authored
      The cited commit exposed an old retransmits_timed_out() bug
      which assumed it could call tcp_model_timeout() with
      TCP_RTO_MIN as rto_base for all states.
      
      But flows in SYN_SENT or SYN_RECV state uses a different
      RTO base (1 sec instead of 200 ms, unless BPF choses
      another value)
      
      This caused a reduction of SYN retransmits from 6 to 4 with
      the default /proc/sys/net/ipv4/tcp_syn_retries value.
      
      Fixes: a41e8a88
      
       ("tcp: better handle TCP_USER_TIMEOUT in SYN_SENT state")
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Cc: Yuchung Cheng <ycheng@google.com>
      Cc: Marek Majkowski <marek@cloudflare.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3256a2d6
    • Dexuan Cui's avatar
      vsock: Fix a lockdep warning in __vsock_release() · 0d9138ff
      Dexuan Cui authored
      
      
      Lockdep is unhappy if two locks from the same class are held.
      
      Fix the below warning for hyperv and virtio sockets (vmci socket code
      doesn't have the issue) by using lock_sock_nested() when __vsock_release()
      is called recursively:
      
      ============================================
      WARNING: possible recursive locking detected
      5.3.0+ #1 Not tainted
      --------------------------------------------
      server/1795 is trying to acquire lock:
      ffff8880c5158990 (sk_lock-AF_VSOCK){+.+.}, at: hvs_release+0x10/0x120 [hv_sock]
      
      but task is already holding lock:
      ffff8880c5158150 (sk_lock-AF_VSOCK){+.+.}, at: __vsock_release+0x2e/0xf0 [vsock]
      
      other info that might help us debug this:
       Possible unsafe locking scenario:
      
             CPU0
             ----
        lock(sk_lock-AF_VSOCK);
        lock(sk_lock-AF_VSOCK);
      
       *** DEADLOCK ***
      
       May be due to missing lock nesting notation
      
      2 locks held by server/1795:
       #0: ffff8880c5d05ff8 (&sb->s_type->i_mutex_key#10){+.+.}, at: __sock_release+0x2d/0xa0
       #1: ffff8880c5158150 (sk_lock-AF_VSOCK){+.+.}, at: __vsock_release+0x2e/0xf0 [vsock]
      
      stack backtrace:
      CPU: 5 PID: 1795 Comm: server Not tainted 5.3.0+ #1
      Call Trace:
       dump_stack+0x67/0x90
       __lock_acquire.cold.67+0xd2/0x20b
       lock_acquire+0xb5/0x1c0
       lock_sock_nested+0x6d/0x90
       hvs_release+0x10/0x120 [hv_sock]
       __vsock_release+0x24/0xf0 [vsock]
       __vsock_release+0xa0/0xf0 [vsock]
       vsock_release+0x12/0x30 [vsock]
       __sock_release+0x37/0xa0
       sock_close+0x14/0x20
       __fput+0xc1/0x250
       task_work_run+0x98/0xc0
       do_exit+0x344/0xc60
       do_group_exit+0x47/0xb0
       get_signal+0x15c/0xc50
       do_signal+0x30/0x720
       exit_to_usermode_loop+0x50/0xa0
       do_syscall_64+0x24e/0x270
       entry_SYSCALL_64_after_hwframe+0x49/0xbe
      RIP: 0033:0x7f4184e85f31
      Tested-by: default avatarStefano Garzarella <sgarzare@redhat.com>
      Signed-off-by: default avatarDexuan Cui <decui@microsoft.com>
      Reviewed-by: default avatarStefano Garzarella <sgarzare@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0d9138ff
    • Johan Hovold's avatar
      hso: fix NULL-deref on tty open · 8353da9f
      Johan Hovold authored
      Fix NULL-pointer dereference on tty open due to a failure to handle a
      missing interrupt-in endpoint when probing modem ports:
      
      	BUG: kernel NULL pointer dereference, address: 0000000000000006
      	...
      	RIP: 0010:tiocmget_submit_urb+0x1c/0xe0 [hso]
      	...
      	Call Trace:
      	hso_start_serial_device+0xdc/0x140 [hso]
      	hso_serial_open+0x118/0x1b0 [hso]
      	tty_open+0xf1/0x490
      
      Fixes: 542f5482
      
       ("tty: Modem functions for the HSO driver")
      Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8353da9f
  2. 01 Oct, 2019 31 commits
  3. 30 Sep, 2019 3 commits
    • Haishuang Yan's avatar
      erspan: remove the incorrect mtu limit for erspan · 0e141f75
      Haishuang Yan authored
      erspan driver calls ether_setup(), after commit 61e84623
      ("net: centralize net_device min/max MTU checking"), the range
      of mtu is [min_mtu, max_mtu], which is [68, 1500] by default.
      
      It causes the dev mtu of the erspan device to not be greater
      than 1500, this limit value is not correct for ipgre tap device.
      
      Tested:
      Before patch:
      # ip link set erspan0 mtu 1600
      Error: mtu greater than device maximum.
      After patch:
      # ip link set erspan0 mtu 1600
      # ip -d link show erspan0
      21: erspan0@NONE: <BROADCAST,MULTICAST> mtu 1600 qdisc noop state DOWN
      mode DEFAULT group default qlen 1000
          link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff promiscuity 0 minmtu 68 maxmtu 0
      
      Fixes: 61e84623
      
       ("net: centralize net_device min/max MTU checking")
      Signed-off-by: default avatarHaishuang Yan <yanhaishuang@cmss.chinamobile.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0e141f75
    • Eric Dumazet's avatar
      sch_cbq: validate TCA_CBQ_WRROPT to avoid crash · e9789c7c
      Eric Dumazet authored
      syzbot reported a crash in cbq_normalize_quanta() caused
      by an out of range cl->priority.
      
      iproute2 enforces this check, but malicious users do not.
      
      kasan: CONFIG_KASAN_INLINE enabled
      kasan: GPF could be caused by NULL-ptr deref or user memory access
      general protection fault: 0000 [#1] SMP KASAN PTI
      Modules linked in:
      CPU: 1 PID: 26447 Comm: syz-executor.1 Not tainted 5.3+ #0
      Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      RIP: 0010:cbq_normalize_quanta.part.0+0x1fd/0x430 net/sched/sch_cbq.c:902
      RSP: 0018:ffff8801a5c333b0 EFLAGS: 00010206
      RAX: 0000000020000003 RBX: 00000000fffffff8 RCX: ffffc9000712f000
      RDX: 00000000000043bf RSI: ffffffff83be8962 RDI: 0000000100000018
      RBP: ffff8801a5c33420 R08: 000000000000003a R09: 0000000000000000
      R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000002ef
      R13: ffff88018da95188 R14: dffffc0000000000 R15: 0000000000000015
      FS:  00007f37d26b1700(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000
      CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      CR2: 00000000004c7cec CR3: 00000001bcd0a006 CR4: 00000000001626f0
      DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      Call Trace:
       [<ffffffff83be9d57>] cbq_normalize_quanta include/net/pkt_sched.h:27 [inline]
       [<ffffffff83be9d57>] cbq_addprio net/sched/sch_cbq.c:1097 [inline]
       [<ffffffff83be9d57>] cbq_set_wrr+0x2d7/0x450 net/sched/sch_cbq.c:1115
       [<ffffffff83bee8a7>] cbq_change_class+0x987/0x225b net/sched/sch_cbq.c:1537
       [<ffffffff83b96985>] tc_ctl_tclass+0x555/0xcd0 net/sched/sch_api.c:2329
       [<ffffffff83a84655>] rtnetlink_rcv_msg+0x485/0xc10 net/core/rtnetlink.c:5248
       [<ffffffff83cadf0a>] netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2510
       [<ffffffff83a7db6d>] rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5266
       [<ffffffff83cac2c6>] netlink_unicast_kernel net/netlink/af_netlink.c:1324 [inline]
       [<ffffffff83cac2c6>] netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1350
       [<ffffffff83cacd4a>] netlink_sendmsg+0x89a/0xd50 net/netlink/af_netlink.c:1939
       [<ffffffff8399d46e>] sock_sendmsg_nosec net/socket.c:673 [inline]
       [<ffffffff8399d46e>] sock_sendmsg+0x12e/0x170 net/socket.c:684
       [<ffffffff8399f1fd>] ___sys_sendmsg+0x81d/0x960 net/socket.c:2359
       [<ffffffff839a2d05>] __sys_sendmsg+0x105/0x1d0 net/socket.c:2397
       [<ffffffff839a2df9>] SYSC_sendmsg net/socket.c:2406 [inline]
       [<ffffffff839a2df9>] SyS_sendmsg+0x29/0x30 net/socket.c:2404
       [<ffffffff8101ccc8>] do_syscall_64+0x528/0x770 arch/x86/entry/common.c:305
       [<ffffffff84400091>] entry_SYSCALL_64_after_hwframe+0x42/0xb7
      
      Fixes: 1da177e4
      
       ("Linux-2.6.12-rc2")
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Reported-by: default avatarsyzbot <syzkaller@googlegroups.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e9789c7c
    • Michal Vokáč's avatar
      net: dsa: qca8k: Use up to 7 ports for all operations · 7ae6d93c
      Michal Vokáč authored
      The QCA8K family supports up to 7 ports. So use the existing
      QCA8K_NUM_PORTS define to allocate the switch structure and limit all
      operations with the switch ports.
      
      This was not an issue until commit 0394a63a ("net: dsa: enable and
      disable all ports") disabled all unused ports. Since the unused ports 7-11
      are outside of the correct register range on this switch some registers
      were rewritten with invalid content.
      
      Fixes: 6b93fb46 ("net-next: dsa: add new driver for qca8xxx family")
      Fixes: a0c02161 ("net: dsa: variable number of ports")
      Fixes: 0394a63a
      
       ("net: dsa: enable and disable all ports")
      Signed-off-by: default avatarMichal Vokáč <michal.vokac@ysoft.com>
      Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7ae6d93c
  4. 29 Sep, 2019 1 commit
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net · 02dc96ef
      Linus Torvalds authored
      Pull networking fixes from David Miller:
      
       1) Sanity check URB networking device parameters to avoid divide by
          zero, from Oliver Neukum.
      
       2) Disable global multicast filter in NCSI, otherwise LLDP and IPV6
          don't work properly. Longer term this needs a better fix tho. From
          Vijay Khemka.
      
       3) Small fixes to selftests (use ping when ping6 is not present, etc.)
          from David Ahern.
      
       4) Bring back rt_uses_gateway member of struct rtable, it's semantics
          were not well understood and trying to remove it broke things. From
          David Ahern.
      
       5) Move usbnet snaity checking, ignore endpoints with invalid
          wMaxPacketSize. From Bjørn Mork.
      
       6) Missing Kconfig deps for sja1105 driver, from Mao Wenan.
      
       7) Various small fixes to the mlx5 DR steering code, from Alaa Hleihel,
          Alex Vesker, and Yevgeny Kliteynik
      
       8) Missing CAP_NET_RAW checks in various places, from Ori Nimron.
      
       9) Fix crash when removing sch_cbs entry while offloading is enabled,
          from Vinicius Costa Gomes.
      
      10) Signedness bug fixes, generally in looking at the result given by
          of_get_phy_mode() and friends. From Dan Crapenter.
      
      11) Disable preemption around BPF_PROG_RUN() calls, from Eric Dumazet.
      
      12) Don't create VRF ipv6 rules if ipv6 is disabled, from David Ahern.
      
      13) Fix quantization code in tcp_bbr, from Kevin Yang.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (127 commits)
        net: tap: clean up an indentation issue
        nfp: abm: fix memory leak in nfp_abm_u32_knode_replace
        tcp: better handle TCP_USER_TIMEOUT in SYN_SENT state
        sk_buff: drop all skb extensions on free and skb scrubbing
        tcp_bbr: fix quantization code to not raise cwnd if not probing bandwidth
        mlxsw: spectrum_flower: Fail in case user specifies multiple mirror actions
        Documentation: Clarify trap's description
        mlxsw: spectrum: Clear VLAN filters during port initialization
        net: ena: clean up indentation issue
        NFC: st95hf: clean up indentation issue
        net: phy: micrel: add Asym Pause workaround for KSZ9021
        net: socionext: ave: Avoid using netdev_err() before calling register_netdev()
        ptp: correctly disable flags on old ioctls
        lib: dimlib: fix help text typos
        net: dsa: microchip: Always set regmap stride to 1
        nfp: flower: fix memory leak in nfp_flower_spawn_vnic_reprs
        nfp: flower: prevent memory leak in nfp_flower_spawn_phy_reprs
        net/sched: Set default of CONFIG_NET_TC_SKB_EXT to N
        vrf: Do not attempt to create IPv6 mcast rule if IPv6 is disabled
        net: sched: sch_sfb: don't call qdisc_put() while holding tree lock
        ...
      02dc96ef
  5. 28 Sep, 2019 2 commits
    • Linus Torvalds's avatar
      Merge branch 'hugepage-fallbacks' (hugepatch patches from David Rientjes) · edf445ad
      Linus Torvalds authored
      Merge hugepage allocation updates from David Rientjes:
       "We (mostly Linus, Andrea, and myself) have been discussing offlist how
        to implement a sane default allocation strategy for hugepages on NUMA
        platforms.
      
        With these reverts in place, the page allocator will happily allocate
        a remote hugepage immediately rather than try to make a local hugepage
        available. This incurs a substantial performance degradation when
        memory compaction would have otherwise made a local hugepage
        available.
      
        This series reverts those reverts and attempts to propose a more sane
        default allocation strategy specifically for hugepages. Andrea
        acknowledges this is likely to fix the swap storms that he originally
        reported that resulted in the patches that removed __GFP_THISNODE from
        hugepage allocations.
      
        The immediate goal is to return 5.3 to the behavior the kernel has
        implemented over the past several years so that remote hugepages are
        not immediately allocated when local hugepages could have been made
        available because the increased access latency is untenable.
      
        The next goal is to introduce a sane default allocation strategy for
        hugepages allocations in general regardless of the configuration of
        the system so that we prevent thrashing of local memory when
        compaction is unlikely to succeed and can prefer remote hugepages over
        remote native pages when the local node is low on memory."
      
      Note on timing: this reverts the hugepage VM behavior changes that got
      introduced fairly late in the 5.3 cycle, and that fixed a huge
      performance regression for certain loads that had been around since
      4.18.
      
      Andrea had this note:
      
       "The regression of 4.18 was that it was taking hours to start a VM
        where 3.10 was only taking a few seconds, I reported all the details
        on lkml when it was finally tracked down in August 2018.
      
           https://lore.kernel.org/linux-mm/20180820032640.9896-2-aarcange@redhat.com/
      
        __GFP_THISNODE in MADV_HUGEPAGE made the above enterprise vfio
        workload degrade like in the "current upstream" above. And it still
        would have been that bad as above until 5.3-rc5"
      
      where the bad behavior ends up happening as you fill up a local node,
      and without that change, you'd get into the nasty swap storm behavior
      due to compaction working overtime to make room for more memory on the
      nodes.
      
      As a result 5.3 got the two performance fix reverts in rc5.
      
      However, David Rientjes then noted that those performance fixes in turn
      regressed performance for other loads - although not quite to the same
      degree.  He suggested reverting the reverts and instead replacing them
      with two small changes to how hugepage allocations are done (patch
      descriptions rephrased by me):
      
       - "avoid expensive reclaim when compaction may not succeed": just admit
         that the allocation failed when you're trying to allocate a huge-page
         and compaction wasn't successful.
      
       - "allow hugepage fallback to remote nodes when madvised": when that
         node-local huge-page allocation failed, retry without forcing the
         local node.
      
      but by then I judged it too late to replace the fixes for a 5.3 release.
      So 5.3 was released with behavior that harked back to the pre-4.18 logic.
      
      But now we're in the merge window for 5.4, and we can see if this
      alternate model fixes not just the horrendous swap storm behavior, but
      also restores the performance regression that the late reverts caused.
      
      Fingers crossed.
      
      * emailed patches from David Rientjes <rientjes@google.com>:
        mm, page_alloc: allow hugepage fallback to remote nodes when madvised
        mm, page_alloc: avoid expensive reclaim when compaction may not succeed
        Revert "Revert "Revert "mm, thp: consolidate THP gfp handling into alloc_hugepage_direct_gfpmask""
        Revert "Revert "mm, thp: restore node-local hugepage allocations""
      edf445ad
    • David Rientjes's avatar
      mm, page_alloc: allow hugepage fallback to remote nodes when madvised · 76e654cc
      David Rientjes authored
      
      
      For systems configured to always try hard to allocate transparent
      hugepages (thp defrag setting of "always") or for memory that has been
      explicitly madvised to MADV_HUGEPAGE, it is often better to fallback to
      remote memory to allocate the hugepage if the local allocation fails
      first.
      
      The point is to allow the initial call to __alloc_pages_node() to attempt
      to defragment local memory to make a hugepage available, if possible,
      rather than immediately fallback to remote memory.  Local hugepages will
      always have a better access latency than remote (huge)pages, so an attempt
      to make a hugepage available locally is always preferred.
      
      If memory compaction cannot be successful locally, however, it is likely
      better to fallback to remote memory.  This could take on two forms: either
      allow immediate fallback to remote memory or do per-zone watermark checks.
      It would be possible to fallback only when per-zone watermarks fail for
      order-0 memory, since that would require local reclaim for all subsequent
      faults so remote huge allocation is likely better than thrashing the local
      zone for large workloads.
      
      In this case, it is assumed that because the system is configured to try
      hard to allocate hugepages or the vma is advised to explicitly want to try
      hard for hugepages that remote allocation is better when local allocation
      and memory compaction have both failed.
      Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
      Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      76e654cc