Commit eed4d47e (ACPI / sleep: Ignore spurious SCI wakeups from
suspend-to-idle) modified the core suspend-to-idle code to filter
out spurious SCI interrupts received while suspended, which requires
ACPI event source handlers to report wakeup events in a way that
will trigger a wakeup from suspend to idle (or abort system suspends
in progress, which is equivalent).

That needs to be done in the rtc-cmos driver too, which was overlooked
by the above commit, so do that now.

Fixes: eed4d47e (ACPI / sleep: Ignore spurious SCI wakeups from suspend-to-idle)
Reported-by: NDavid E. Box <david.e.box@linux.intel.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

Commit 8a537ece (PM / wakeup: Integrate mechanism to abort
transitions in progress) modified wakeup_source_report_event()
and wakeup_source_activate() to make it possible to call
pm_system_wakeup() from the latter if so indicated by the
caller of the former (via a new function argument added by that
commit), but it overlooked the fact that in some situations
wakeup_source_report_event() is called to signal a "hard" event
(ie. such that should abort a system suspend in progress) after
pm_stay_awake() has been called for the same wakeup source object,
in which case the pm_system_wakeup() will not trigger.

To work around this issue, modify wakeup_source_activate() and
wakeup_source_report_event() again so that pm_system_wakeup() is
called by the latter directly (if its last argument is true), in
which case the additional argument does not need to be passed
to wakeup_source_activate() any more, so drop it from there.

Fixes: 8a537ece (PM / wakeup: Integrate mechanism to abort transitions in progress)
Reported-by: NDavid E. Box <david.e.box@linux.intel.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

The ACPI SCI (System Control Interrupt) is set up as a wakeup IRQ
during suspend-to-idle transitions and, consequently, any events
signaled through it wake up the system from that state.  However,
on some systems some of the events signaled via the ACPI SCI while
suspended to idle should not cause the system to wake up.  In fact,
quite often they should just be discarded.

Arguably, systems should not resume entirely on such events, but in
order to decide which events really should cause the system to resume
and which are spurious, it is necessary to resume up to the point
when ACPI SCIs are actually handled and processed, which is after
executing dpm_resume_noirq() in the system resume path.

For this reasons, add a loop around freeze_enter() in which the
platforms can process events signaled via multiplexed IRQ lines
like the ACPI SCI and add suspend-to-idle hooks that can be
used for this purpose to struct platform_freeze_ops.

In the ACPI case, the ->wake hook is used for checking if the SCI
has triggered while suspended and deferring the interrupt-induced
system wakeup until the events signaled through it are actually
processed sufficiently to decide whether or not the system should
resume.  In turn, the ->sync hook allows all of the relevant event
queues to be flushed so as to prevent events from being missed due
to race conditions.

In addition to that, some ACPI code processing wakeup events needs
to be modified to use the "hard" version of wakeup triggers, so that
it will cause a system resume to happen on device-induced wakeup
events even if the "soft" mechanism to prevent the system from
suspending is not enabled (that also helps to catch device-induced
wakeup events occurring during suspend transitions in progress).
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

The system wakeup framework is not very consistent with respect to
the way it handles suspend-to-idle and generally wakeup events
occurring during transitions to system low-power states.

First off, system transitions in progress are aborted by the event
reporting helpers like pm_wakeup_event() only if the wakeup_count
sysfs attribute is in use (as documented), but there are cases in
which system-wide transitions should be aborted even if that is
not the case.  For example, a wakeup signal from a designated
wakeup device during system-wide PM transition, it should cause
the transition to be aborted right away.

Moreover, there is a freeze_wake() call in wakeup_source_activate(),
but that really is only effective after suspend_freeze_state has
been set to FREEZE_STATE_ENTER by freeze_enter().  However, it
is very unlikely that wakeup_source_activate() will ever be called
at that time, as it could only be triggered by a IRQF_NO_SUSPEND
interrupt handler, so wakeups from suspend-to-idle don't really
occur in wakeup_source_activate().

At the same time there is a way to abort a system suspend in
progress (or wake up the system from suspend-to-idle), which is by
calling pm_system_wakeup(), but in turn that doesn't cause any
wakeup source objects to be activated, so it will not be covered
by wakeup source statistics and will not prevent the system from
suspending again immediately (in case autosleep is used, for
example).  Consequently, if anyone wants to abort system transitions
in progress and allow the wakeup_count mechanism to work, they need
to use both pm_system_wakeup() and pm_wakeup_event(), say, at the
same time which is awkward.

For the above reasons, make it possible to trigger
pm_system_wakeup() from within wakeup_source_activate() and
provide a new pm_wakeup_hard_event() helper to do so within the
wakeup framework.
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

Pull x86 fixes from Thomas Gleixner:
 "The final fixes for 4.11:

   - prevent a triple fault with function graph tracing triggered via
     suspend to ram

   - prevent optimizing for size when function graph tracing is enabled
     and the compiler does not support -mfentry

   - prevent mwaitx() being called with a zero timeout as mwaitx() might
     never return. Observed on the new Ryzen CPUs"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Prevent timer value 0 for MWAITX
  x86/build: convert function graph '-Os' error to warning
  ftrace/x86: Fix triple fault with graph tracing and suspend-to-ram

Pull scheduler fix from Thomas Gleixner:
 "A single fix for a cputime accounting regression which got introduced
  in the 4.11 cycle"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/cputime: Fix ksoftirqd cputime accounting regression

Newer hardware has uncovered a bug in the software implementation of
using MWAITX for the delay function. A value of 0 for the timer is meant
to indicate that a timeout will not be used to exit MWAITX. On newer
hardware this can result in MWAITX never returning, resulting in NMI
soft lockup messages being printed. On older hardware, some of the other
conditions under which MWAITX can exit masked this issue. The AMD APM
does not currently document this and will be updated.

Please refer to http://marc.info/?l=kvm&m=148950623231140 for
information regarding NMI soft lockup messages on an AMD Ryzen 1800X.
This has been root-caused as a 0 passed to MWAITX causing it to wait
indefinitely.

This change has the added benefit of avoiding the unnecessary setup of
MONITORX/MWAITX when the delay value is zero.
Signed-off-by: NJanakarajan Natarajan <Janakarajan.Natarajan@amd.com>
Link: http://lkml.kernel.org/r/1493156643-29366-1-git-send-email-Janakarajan.Natarajan@amd.comSigned-off-by: NThomas Gleixner <tglx@linutronix.de>

Pull iov iter fix from Al Viro.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  fix a braino in ITER_PIPE iov_iter_revert()

Fixes: 27c0e374Tested-by: NDave Jones <davej@codemonkey.org.uk>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Pull clk fix from Stephen Boyd:
 "One odd config build fix for a recent Allwinner clock driver change
  that got merged. The common code called code in another file that
  wasn't always built. This just forces it on so people don't run into
  this bad configuration"

* tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux:
  clk: sunxi-ng: always select CCU_GATE

Pull networking fixes from David Miller:
 "Just a couple more stragglers, I really hope this is it.

  1) Don't let frags slip down into the GRO segmentation handlers, from
     Steffen Klassert.

  2) Truesize under-estimation triggers warnings in TCP over loopback
     with socket filters, 2 part fix from Eric Dumazet.

  3) Fix undesirable reset of bonding MTU to ETH_HLEN on slave removal,
     from Paolo Abeni.

  4) If we flush the XFRM policy after garbage collection, it doesn't
     work because stray entries can be created afterwards. Fix from Xin
     Long.

  5) Hung socket connection fixes in TIPC from Parthasarathy Bhuvaragan.

  6) Fix GRO regression with IPSEC when netfilter is disabled, from
     Sabrina Dubroca.

  7) Fix cpsw driver Kconfig dependency regression, from Arnd Bergmann"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
  net: hso: register netdev later to avoid a race condition
  net: adjust skb->truesize in ___pskb_trim()
  tcp: do not underestimate skb->truesize in tcp_trim_head()
  bonding: avoid defaulting hard_header_len to ETH_HLEN on slave removal
  ipv4: Don't pass IP fragments to upper layer GRO handlers.
  cpsw/netcp: refine cpts dependency
  tipc: close the connection if protocol messages contain errors
  tipc: improve error validations for sockets in CONNECTING state
  tipc: Fix missing connection request handling
  xfrm: fix GRO for !CONFIG_NETFILTER
  xfrm: do the garbage collection after flushing policy

If the netdev is accessed before the urbs are initialized,
there will be NULL pointer dereferences. That is avoided by
registering it when it is fully initialized.

This case occurs e.g. if dhcpcd is running in the background
and the device is probed, either after insmod hso or
when the device appears on the usb bus.

A backtrace is the following:

[ 1357.356048] usb 1-2: new high-speed USB device number 12 using ehci-omap
[ 1357.551177] usb 1-2: New USB device found, idVendor=0af0, idProduct=8800
[ 1357.558654] usb 1-2: New USB device strings: Mfr=3, Product=2, SerialNumber=0
[ 1357.568572] usb 1-2: Product: Globetrotter HSUPA Modem
[ 1357.574096] usb 1-2: Manufacturer: Option N.V.
[ 1357.685882] hso 1-2:1.5: Not our interface
[ 1460.886352] hso: unloaded
[ 1460.889984] usbcore: deregistering interface driver hso
[ 1513.769134] hso: ../drivers/net/usb/hso.c: Option Wireless
[ 1513.846771] Unable to handle kernel NULL pointer dereference at virtual address 00000030
[ 1513.887664] hso 1-2:1.5: Not our interface
[ 1513.906890] usbcore: registered new interface driver hso
[ 1513.937988] pgd = ecdec000
[ 1513.949890] [00000030] *pgd=acd15831, *pte=00000000, *ppte=00000000
[ 1513.956573] Internal error: Oops: 817 [#1] PREEMPT SMP ARM
[ 1513.962371] Modules linked in: hso usb_f_ecm omap2430 bnep bluetooth g_ether usb_f_rndis u_ether libcomposite configfs ipv6 arc4 wl18xx wlcore mac80211 cfg80211 bq27xxx_battery panel_tpo_td028ttec1 omapdrm drm_kms_helper cfbfillrect snd_soc_simple_card syscopyarea cfbimgblt snd_soc_simple_card_utils sysfillrect sysimgblt fb_sys_fops snd_soc_omap_twl4030 cfbcopyarea encoder_opa362 drm twl4030_madc_hwmon wwan_on_off snd_soc_gtm601 pwm_omap_dmtimer generic_adc_battery connector_analog_tv pwm_bl extcon_gpio omap3_isp wlcore_sdio videobuf2_dma_contig videobuf2_memops w1_bq27000 videobuf2_v4l2 videobuf2_core omap_hdq snd_soc_omap_mcbsp ov9650 snd_soc_omap bmp280_i2c bmg160_i2c v4l2_common snd_pcm_dmaengine bmp280 bmg160_core at24 bmc150_magn_i2c nvmem_core videodev phy_twl4030_usb bmc150_accel_i2c tsc2007
[ 1514.037384]  bmc150_magn bmc150_accel_core media leds_tca6507 bno055 industrialio_triggered_buffer kfifo_buf gpio_twl4030 musb_hdrc snd_soc_twl4030 twl4030_vibra twl4030_madc twl4030_pwrbutton twl4030_charger industrialio w2sg0004 ehci_omap omapdss [last unloaded: hso]
[ 1514.062622] CPU: 0 PID: 3433 Comm: dhcpcd Tainted: G        W       4.11.0-rc8-letux+ #1
[ 1514.071136] Hardware name: Generic OMAP36xx (Flattened Device Tree)
[ 1514.077758] task: ee748240 task.stack: ecdd6000
[ 1514.082580] PC is at hso_start_net_device+0x50/0xc0 [hso]
[ 1514.088287] LR is at hso_net_open+0x68/0x84 [hso]
[ 1514.093231] pc : [<bf79c304>]    lr : [<bf79ced8>]    psr: a00f0013
sp : ecdd7e20  ip : 00000000  fp : ffffffff
[ 1514.105316] r10: 00000000  r9 : ed0e080c  r8 : ecd8fe2c
[ 1514.110839] r7 : bf79cef4  r6 : ecd8fe00  r5 : 00000000  r4 : ed0dbd80
[ 1514.117706] r3 : 00000000  r2 : c0020c80  r1 : 00000000  r0 : ecdb7800
[ 1514.124572] Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[ 1514.132110] Control: 10c5387d  Table: acdec019  DAC: 00000051
[ 1514.138153] Process dhcpcd (pid: 3433, stack limit = 0xecdd6218)
[ 1514.144470] Stack: (0xecdd7e20 to 0xecdd8000)
[ 1514.149078] 7e20: ed0dbd80 ecd8fe98 00000001 00000000 ecd8f800 ecd8fe00 ecd8fe60 00000000
[ 1514.157714] 7e40: ed0e080c bf79ced8 bf79ce70 ecd8f800 00000001 bf7a0258 ecd8f830 c068d958
[ 1514.166320] 7e60: c068d8b8 ecd8f800 00000001 00001091 00001090 c068dba4 ecd8f800 00001090
[ 1514.174926] 7e80: ecd8f940 ecd8f800 00000000 c068dc60 00000000 00000001 ed0e0800 ecd8f800
[ 1514.183563] 7ea0: 00000000 c06feaa8 c0ca39c2 beea57dc 00000020 00000000 306f7368 00000000
[ 1514.192169] 7ec0: 00000000 00000000 00001091 00000000 00000000 00000000 00000000 00008914
[ 1514.200805] 7ee0: eaa9ab60 beea57dc c0c9bfc0 eaa9ab40 00000006 00000000 00046858 c066a948
[ 1514.209411] 7f00: beea57dc eaa9ab60 ecc6b0c0 c02837b0 00000006 c0282c90 0000c000 c0283654
[ 1514.218017] 7f20: c09b0c00 c098bc31 00000001 c0c5e513 c0c5e513 00000000 c0151354 c01a20c0
[ 1514.226654] 7f40: c0c5e513 c01a3134 ecdd6000 c01a3160 ee7487f0 600f0013 00000000 ee748240
[ 1514.235260] 7f60: ee748734 00000000 ecc6b0c0 ecc6b0c0 beea57dc 00008914 00000006 00000000
[ 1514.243896] 7f80: 00046858 c02837b0 00001091 0003a1f0 00046608 0003a248 00000036 c01071e4
[ 1514.252502] 7fa0: ecdd6000 c0107040 0003a1f0 00046608 00000006 00008914 beea57dc 00001091
[ 1514.261108] 7fc0: 0003a1f0 00046608 0003a248 00000036 0003ac0c 00046608 00046610 00046858
[ 1514.269744] 7fe0: 0003a0ac beea57d4 000167eb b6f23106 400f0030 00000006 00000000 00000000
[ 1514.278411] [<bf79c304>] (hso_start_net_device [hso]) from [<bf79ced8>] (hso_net_open+0x68/0x84 [hso])
[ 1514.288238] [<bf79ced8>] (hso_net_open [hso]) from [<c068d958>] (__dev_open+0xa0/0xf4)
[ 1514.296600] [<c068d958>] (__dev_open) from [<c068dba4>] (__dev_change_flags+0x8c/0x130)
[ 1514.305023] [<c068dba4>] (__dev_change_flags) from [<c068dc60>] (dev_change_flags+0x18/0x48)
[ 1514.313934] [<c068dc60>] (dev_change_flags) from [<c06feaa8>] (devinet_ioctl+0x348/0x714)
[ 1514.322540] [<c06feaa8>] (devinet_ioctl) from [<c066a948>] (sock_ioctl+0x2b0/0x308)
[ 1514.330627] [<c066a948>] (sock_ioctl) from [<c0282c90>] (vfs_ioctl+0x20/0x34)
[ 1514.338165] [<c0282c90>] (vfs_ioctl) from [<c0283654>] (do_vfs_ioctl+0x82c/0x93c)
[ 1514.346038] [<c0283654>] (do_vfs_ioctl) from [<c02837b0>] (SyS_ioctl+0x4c/0x74)
[ 1514.353759] [<c02837b0>] (SyS_ioctl) from [<c0107040>] (ret_fast_syscall+0x0/0x1c)
[ 1514.361755] Code: e3822103 e3822080 e1822781 e5981014 (e5832030)
[ 1514.510833] ---[ end trace dfb3e53c657f34a0 ]---
Reported-by: NH. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: NAndreas Kemnade <andreas@kemnade.info>
Reviewed-by: NJohan Hovold <johan@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Andrey found a way to trigger the WARN_ON_ONCE(delta < len) in
skb_try_coalesce() using syzkaller and a filter attached to a TCP
socket.

As we did recently in commit 158f323b ("net: adjust skb->truesize in
pskb_expand_head()") we can adjust skb->truesize from ___pskb_trim(),
via a call to skb_condense().

If all frags were freed, then skb->truesize can be recomputed.

This call can be done if skb is not yet owned, or destructor is
sock_edemux().
Signed-off-by: NEric Dumazet <edumazet@google.com>
Reported-by: NAndrey Konovalov <andreyknvl@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Andrey found a way to trigger the WARN_ON_ONCE(delta < len) in
skb_try_coalesce() using syzkaller and a filter attached to a TCP
socket over loopback interface.

I believe one issue with looped skbs is that tcp_trim_head() can end up
producing skb with under estimated truesize.

It hardly matters for normal conditions, since packets sent over
loopback are never truncated.

Bytes trimmed from skb->head should not change skb truesize, since
skb->head is not reallocated.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Reported-by: NAndrey Konovalov <andreyknvl@google.com>
Tested-by: NAndrey Konovalov <andreyknvl@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

On slave list updates, the bonding driver computes its hard_header_len
as the maximum of all enslaved devices's hard_header_len.
If the slave list is empty, e.g. on last enslaved device removal,
ETH_HLEN is used.

Since the bonding header_ops are set only when the first enslaved
device is attached, the above can lead to header_ops->create()
being called with the wrong skb headroom in place.

If bond0 is configured on top of ipoib devices, with the
following commands:

ifup bond0
for slave in $BOND_SLAVES_LIST; do
	ip link set dev $slave nomaster
done
ping -c 1 <ip on bond0 subnet>

we will obtain a skb_under_panic() with a similar call trace:
	skb_push+0x3d/0x40
	push_pseudo_header+0x17/0x30 [ib_ipoib]
	ipoib_hard_header+0x4e/0x80 [ib_ipoib]
	arp_create+0x12f/0x220
	arp_send_dst.part.19+0x28/0x50
	arp_solicit+0x115/0x290
	neigh_probe+0x4d/0x70
	__neigh_event_send+0xa7/0x230
	neigh_resolve_output+0x12e/0x1c0
	ip_finish_output2+0x14b/0x390
	ip_finish_output+0x136/0x1e0
	ip_output+0x76/0xe0
	ip_local_out+0x35/0x40
	ip_send_skb+0x19/0x40
	ip_push_pending_frames+0x33/0x40
	raw_sendmsg+0x7d3/0xb50
	inet_sendmsg+0x31/0xb0
	sock_sendmsg+0x38/0x50
	SYSC_sendto+0x102/0x190
	SyS_sendto+0xe/0x10
	do_syscall_64+0x67/0x180
	entry_SYSCALL64_slow_path+0x25/0x25

This change addresses the issue avoiding updating the bonding device
hard_header_len when the slaves list become empty, forbidding to
shrink it below the value used by header_ops->create().

The bug is there since commit 54ef3137 ("[PATCH] bonding: Handle large
hard_header_len") but the panic can be triggered only since
commit fc791b63 ("IB/ipoib: move back IB LL address into the hard
header").
Reported-by: NNorbert P <noe@physik.uzh.ch>
Fixes: 54ef3137 ("[PATCH] bonding: Handle large hard_header_len")
Fixes: fc791b63 ("IB/ipoib: move back IB LL address into the hard header")
Signed-off-by: NMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: NPaolo Abeni <pabeni@redhat.com>
Signed-off-by: NJay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Upper layer GRO handlers can not handle IP fragments, so
exit GRO processing in this case.

This fixes ESP GRO because the packet must be reassembled
before we can decapsulate, otherwise we get authentication
failures.

It also aligns IPv4 to IPv6 where packets with fragmentation
headers are not passed to upper layer GRO handlers.

Fixes: 7785bba2 ("esp: Add a software GRO codepath")
Signed-off-by: NSteffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Tony Lindgren reports a kernel oops that resulted from my compile-time
fix on the default config. This shows two problems:

a) configurations that did not already enable PTP_1588_CLOCK will
   now miss the cpts driver

b) when cpts support is disabled, the driver crashes. This is a
   preexisting problem that we did not notice before my patch.

While the second problem is still being investigated, this modifies
the dependencies again, getting us back to the original state, with
another 'select NET_PTP_CLASSIFY' added in to avoid the original
link error we got, and the 'depends on POSIX_TIMERS' to hide
the CPTS support when turning it on would be useless.

Cc: stable@vger.kernel.org # 4.11 needs this
Fixes: 07fef362 ("cpsw/netcp: cpts depends on posix_timers")
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Tested-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Steffen Klassert says:

====================
pull request (net): ipsec 2017-04-28

1) Do garbage collecting after a policy flush to remove old
   bundles immediately. From Xin Long.

2) Fix GRO if netfilter is not defined.
   From Sabrina Dubroca.

Please pull or let me know if there are problems.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Pull input fix from Dmitry Torokhov:
 "Yet another quirk to i8042 to get touchpad recognized on some laptops"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: i8042 - add Clevo P650RS to the i8042 reset list

When the base driver is enabled but all SoC specific drivers are turned
off, we now get a build error after code was added to always refer to the
clk gates:

drivers/clk/built-in.o: In function `ccu_pll_notifier_cb':
:(.text+0x154f8): undefined reference to `ccu_gate_helper_disable'
:(.text+0x15504): undefined reference to `ccu_gate_helper_enable'

This changes the Kconfig to always require the gate code to be built-in
when CONFIG_SUNXI_CCU is set.

Fixes: 02ae2bc6 ("clk: sunxi-ng: Add clk notifier to gate then ungate PLL clocks")
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>

Pull btrfs fix from Chris Mason:
 "We have one more fix for btrfs.

  This gets rid of a new WARN_ON from rc1 that ended up making more
  noise than we really want. The larger fix for the underflow got
  delayed a bit and it's better for now to put it under
  CONFIG_BTRFS_DEBUG"

* 'for-linus-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  btrfs: qgroup: move noisy underflow warning to debugging build

Parthasarathy Bhuvaragan says:

====================
tipc: fix hanging socket connections

This patch series contains fixes for the socket layer to
prevent hanging / stale connections.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

When a socket is shutting down, we notify the peer node about the
connection termination by reusing an incoming message if possible.
If the last received message was a connection acknowledgment
message, we reverse this message and set the error code to
TIPC_ERR_NO_PORT and send it to peer.

In tipc_sk_proto_rcv(), we never check for message errors while
processing the connection acknowledgment or probe messages. Thus
this message performs the usual flow control accounting and leaves
the session hanging.

In this commit, we terminate the connection when we receive such
error messages.
Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Reviewed-by: NJon Maloy <jon.maloy@ericsson.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Until now, the checks for sockets in CONNECTING state was based on
the assumption that the incoming message was always from the
peer's accepted data socket.

However an application using a non-blocking socket sends an implicit
connect, this socket which is in CONNECTING state can receive error
messages from the peer's listening socket. As we discard these
messages, the application socket hangs as there due to inactivity.
In addition to this, there are other places where we process errors
but do not notify the user.

In this commit, we process such incoming error messages and notify
our users about them using sk_state_change().
Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Reviewed-by: NJon Maloy <jon.maloy@ericsson.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In filter_connect, we use waitqueue_active() to check for any
connections to wakeup. But waitqueue_active() is missing memory
barriers while accessing the critical sections, leading to
inconsistent results.

In this commit, we replace this with an SMP safe wq_has_sleeper()
using the generic socket callback sk_data_ready().
Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Reviewed-by: NJon Maloy <jon.maloy@ericsson.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Pull nfsd fixes from Bruce Fields:
 "Thanks to Ari Kauppi and Tuomas Haanpää at Synopsis for spotting bugs
  in our NFSv2/v3 xdr code that could crash the server or leak memory"

* tag 'nfsd-4.11-3' of git://linux-nfs.org/~bfields/linux:
  nfsd: stricter decoding of write-like NFSv2/v3 ops
  nfsd4: minor NFSv2/v3 write decoding cleanup
  nfsd: check for oversized NFSv2/v3 arguments

Pull ceph fix from Ilya Dryomov:
 "A fix for a kernel stack overflow bug in ceph setattr code, marked for
  stable"

* tag 'ceph-for-4.11-rc9' of git://github.com/ceph/ceph-client:
  ceph: fix recursion between ceph_set_acl() and __ceph_setattr()

Pull vfs fixes from Al Viro:

 - fix orangefs handling of faults on write() - I'd missed that one back
   when orangefs was going through review.

 - readdir counterpart of "9p: cope with bogus responses from server in
   p9_client_{read,write}" - server might be lying or broken, and we'd
   better not overrun the kmalloc'ed buffer we are copying the results
   into.

 - NFS O_DIRECT read/write can leave iov_iter advanced by too much;
   that's what had been causing iov_iter_pipe() warnings davej had been
   seeing.

 - statx_timestamp.tv_nsec type fix (s32 -> u32). That one really should
   go in before 4.11.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  uapi: change the type of struct statx_timestamp.tv_nsec to unsigned
  fix nfs O_DIRECT advancing iov_iter too much
  p9_client_readdir() fix
  orangefs_bufmap_copy_from_iovec(): fix EFAULT handling

The change in commit 1e2f82d1 ("statx: Kill fd-with-NULL-path
support in favour of AT_EMPTY_PATH") to error on a NULL pathname to
statx() is inconsistent.

It results in the error EINVAL for a NULL pathname.  Other system calls
with similar APIs (fchownat(), fstatat(), linkat()), return EFAULT.

The solution is simply to remove the EINVAL check.  As I already pointed
out in [1], user_path_at*() and filename_lookup() will handle the NULL
pathname as per the other APIs, to correctly produce the error EFAULT.

[1] https://lkml.org/lkml/2017/4/26/561Signed-off-by: NMichael Kerrisk <mtk.manpages@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

In xfrm_input() when called from GRO, async == 0, and we end up
skipping the processing in xfrm4_transport_finish(). GRO path will
always skip the NF_HOOK, so we don't need the special-case for
!NETFILTER during GRO processing.

Fixes: 7785bba2 ("esp: Add a software GRO codepath")
Signed-off-by: NSabrina Dubroca <sd@queasysnail.net>
Signed-off-by: NSteffen Klassert <steffen.klassert@secunet.com>

irq_time_read() returns the irqtime minus the ksoftirqd time. This
is necessary because irq_time_read() is used to substract the IRQ time
from the sum_exec_runtime of a task. If we were to include the softirq
time of ksoftirqd, this task would substract its own CPU time everytime
it updates ksoftirqd->sum_exec_runtime which would therefore never
progress.

But this behaviour got broken by:

  a499a5a1 ("sched/cputime: Increment kcpustat directly on irqtime account")

... which now includes ksoftirqd softirq time in the time returned by
irq_time_read().

This has resulted in wrong ksoftirqd cputime reported to userspace
through /proc/stat and thus "top" not showing ksoftirqd when it should
after intense networking load.

ksoftirqd->stime happens to be correct but it gets scaled down by
sum_exec_runtime through task_cputime_adjusted().

To fix this, just account the strict IRQ time in a separate counter and
use it to report the IRQ time.
Reported-and-tested-by: NJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: NRik van Riel <riel@redhat.com>
Acked-by: NJesper Dangaard Brouer <brouer@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Link: http://lkml.kernel.org/r/1493129448-5356-1-git-send-email-fweisbec@gmail.comSigned-off-by: NIngo Molnar <mingo@kernel.org>

The comment asserting that the value of struct statx_timestamp.tv_nsec
must be negative when statx_timestamp.tv_sec is negative, is wrong, as
could be seen from the following example:

	#define _FILE_OFFSET_BITS 64
	#include <assert.h>
	#include <fcntl.h>
	#include <stdio.h>
	#include <sys/stat.h>
	#include <unistd.h>
	#include <asm/unistd.h>
	#include <linux/stat.h>

	int main(void)
	{
		static const struct timespec ts[2] = {
			{ .tv_nsec = UTIME_OMIT },
			{ .tv_sec = -2, .tv_nsec = 42 }
		};
		assert(utimensat(AT_FDCWD, ".", ts, 0) == 0);

		struct stat st;
		assert(stat(".", &st) == 0);
		printf("st_mtim.tv_sec = %lld, st_mtim.tv_nsec = %lu\n",
		       (long long) st.st_mtim.tv_sec,
		       (unsigned long) st.st_mtim.tv_nsec);

		struct statx stx;
		assert(syscall(__NR_statx, AT_FDCWD, ".", 0, 0, &stx) == 0);
		printf("stx_mtime.tv_sec = %lld, stx_mtime.tv_nsec = %lu\n",
		       (long long) stx.stx_mtime.tv_sec,
		       (unsigned long) stx.stx_mtime.tv_nsec);

		return 0;
	}

It expectedly prints:
st_mtim.tv_sec = -2, st_mtim.tv_nsec = 42
stx_mtime.tv_sec = -2, stx_mtime.tv_nsec = 42

The more generic comment asserting that the value of struct
statx_timestamp.tv_nsec might be negative is confusing to say the least.

It contradicts both the struct stat.st_[acm]time_nsec tradition and
struct timespec.tv_nsec requirements in utimensat syscall.
If statx syscall ever returns a stx_[acm]time containing a negative
tv_nsec that cannot be passed unmodified to utimensat syscall,
it will cause an immense confusion.

Fix this source of confusion by changing the type of struct
statx_timestamp.tv_nsec from __s32 to __u32.

Fixes: a528d35e ("statx: Add a system call to make enhanced file info available")
Signed-off-by: NDmitry V. Levin <ldv@altlinux.org>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: linux-api@vger.kernel.org
cc: mtk.manpages@gmail.com
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Pull sparc fixes from David Miller:
 "I didn't want the release to go out without the statx system call
  properly hooked up"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  sparc: Update syscall tables.
  sparc64: Fill in rest of HAVE_REGS_AND_STACK_ACCESS_API

With the new statx() syscall, the following both allow the attributes of
the file attached to a file descriptor to be retrieved:

	statx(dfd, NULL, 0, ...);

and:

	statx(dfd, "", AT_EMPTY_PATH, ...);

Change the code to reject the first option, though this means copying
the path and engaging pathwalk for the fstat() equivalent.  dfd can be a
non-directory provided path is "".

[ The timing of this isn't wonderful, but applying this now before we
  have statx() in any released kernel, before anybody starts using the
  NULL special case.    - Linus ]

Fixes: a528d35e ("statx: Add a system call to make enhanced file info available")
Reported-by: NMichael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Eric Sandeen <sandeen@sandeen.net>
cc: fstests@vger.kernel.org
cc: linux-api@vger.kernel.org
cc: linux-man@vger.kernel.org
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Pull networking fixes from David Miller:

 1) MLX5 bug fixes from Saeed Mahameed et al:
     - released wrong resources when firmware timeout happens
     - fix wrong check for encapsulation size limits
     - UAR memory leak
     - ETHTOOL_GRXCLSRLALL failed to fill in info->data

 2) Don't cache l3mdev on mis-matches local route, causes net devices to
    leak refs. From Robert Shearman.

 3) Handle fragmented SKBs properly in macsec driver, the problem is
    that we were mis-sizing the sgvec table. From Jason A. Donenfeld.

 4) We cannot have checksum offload enabled for inner UDP tunneled
    packet during IPSEC, from Ansis Atteka.

 5) Fix double SKB free in ravb driver, from Dan Carpenter.

 6) Fix CPU port handling in b53 DSA driver, from Florian Dainelli.

 7) Don't use on-stack buffers for usb_control_msg() in CAN usb driver,
    from Maksim Salau.

 8) Fix device leak in macvlan driver, from Herbert Xu. We have to purge
    the broadcast queue properly on port destroy.

 9) Fix tx ring entry limit on EF10 devices in sfc driver. From Bert
    Kenward.

10) Fix memory leaks in team driver, from Pan Bian.

11) Don't setup ipv6_stub before it can be actually used, from Paolo
    Abeni.

12) Fix tipc socket flow control accounting, from Parthasarathy
    Bhuvaragan.

13) Fix crash on module unload in hso driver, from Andreas Kemnade.

14) Fix purging of bridge multicast entries, the problem is that if we
    don't defer it to ndo_uninit it's possible for new entries to get
    added after we purge. Fix from Xin Long.

15) Don't return garbage for PACKET_HDRLEN getsockopt, from Alexander
    Potapenko.

16) Fix autoneg stall properly in PHY layer, and revert micrel driver
    change that was papering over it. From Alexander Kochetkov.

17) Don't dereference an ipv4 route as an ipv6 one in the ip6_tunnnel
    code, from Cong Wang.

18) Clear out the congestion control private of the TCP socket in all of
    the right places, from Wei Wang.

19) rawv6_ioctl measures SKB length incorrectly, fix from Jamie
    Bainbridge.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (41 commits)
  ipv6: check raw payload size correctly in ioctl
  tcp: memset ca_priv data to 0 properly
  ipv6: check skb->protocol before lookup for nexthop
  net: core: Prevent from dereferencing null pointer when releasing SKB
  macsec: dynamically allocate space for sglist
  Revert "phy: micrel: Disable auto negotiation on startup"
  net: phy: fix auto-negotiation stall due to unavailable interrupt
  net/packet: check length in getsockopt() called with PACKET_HDRLEN
  net: ipv6: regenerate host route if moved to gc list
  bridge: move bridge multicast cleanup to ndo_uninit
  ipv6: fix source routing
  qed: Fix error in the dcbx app meta data initialization.
  netvsc: fix calculation of available send sections
  net: hso: fix module unloading
  tipc: fix socket flow control accounting error at tipc_recv_stream
  tipc: fix socket flow control accounting error at tipc_send_stream
  ipv6: move stub initialization after ipv6 setup completion
  team: fix memory leaks
  sfc: tx ring can only have 2048 entries for all EF10 NICs
  macvlan: Fix device ref leak when purging bc_queue
  ...

In situations where an skb is paged, the transport header pointer and
tail pointer can be the same because the skb contents are in frags.

This results in ioctl(SIOCINQ/FIONREAD) incorrectly returning a
length of 0 when the length to receive is actually greater than zero.

skb->len is already correctly set in ip6_input_finish() with
pskb_pull(), so use skb->len as it always returns the correct result
for both linear and paged data.
Signed-off-by: NJamie Bainbridge <jbainbri@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Always zero out ca_priv data in tcp_assign_congestion_control() so that
ca_priv data is cleared out during socket creation.
Also always zero out ca_priv data in tcp_reinit_congestion_control() so
that when cc algorithm is changed, ca_priv data is cleared out as well.
We should still zero out ca_priv data even in TCP_CLOSE state because
user could call connect() on AF_UNSPEC to disconnect the socket and
leave it in TCP_CLOSE state and later call setsockopt() to switch cc
algorithm on this socket.

Fixes: 2b0a8c9e ("tcp: add CDG congestion control")
Reported-by: NAndrey Konovalov  <andreyknvl@google.com>
Signed-off-by: NWei Wang <weiwan@google.com>
Acked-by: NEric Dumazet <edumazet@google.com>
Acked-by: NYuchung Cheng <ycheng@google.com>
Acked-by: NNeal Cardwell <ncardwell@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Andrey reported a out-of-bound access in ip6_tnl_xmit(), this
is because we use an ipv4 dst in ip6_tnl_xmit() and cast an IPv4
neigh key as an IPv6 address:

        neigh = dst_neigh_lookup(skb_dst(skb),
                                 &ipv6_hdr(skb)->daddr);
        if (!neigh)
                goto tx_err_link_failure;

        addr6 = (struct in6_addr *)&neigh->primary_key; // <=== HERE
        addr_type = ipv6_addr_type(addr6);

        if (addr_type == IPV6_ADDR_ANY)
                addr6 = &ipv6_hdr(skb)->daddr;

        memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));

Also the network header of the skb at this point should be still IPv4
for 4in6 tunnels, we shold not just use it as IPv6 header.

This patch fixes it by checking if skb->protocol is ETH_P_IPV6: if it
is, we are safe to do the nexthop lookup using skb_dst() and
ipv6_hdr(skb)->daddr; if not (aka IPv4), we have no clue about which
dest address we can pick here, we have to rely on callers to fill it
from tunnel config, so just fall to ip6_route_output() to make the
decision.

Fixes: ea3dc960 ("ip6_tunnel: Add support for wildcard tunnel endpoints.")
Reported-by: NAndrey Konovalov <andreyknvl@google.com>
Tested-by: NAndrey Konovalov <andreyknvl@google.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: NCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Added NULL check to make __dev_kfree_skb_irq consistent with kfree
family of functions.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=195289Signed-off-by: NMyungho Jung <mhjungk@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>