Sometimes it is helpful to build a kernel compilation unit
directly, i.e.:

  make .../<filename>.i

in order to look at compiler output.

Since asm-offsets_{32,64}.c are included by asm-offsets.c and
building them directly doesn't evaluate the macros used (thus
making the preprocessor output not very useful), error out when
an attempt is made to build them. Issue a hint for the user to
build asm-offsets.c instead.
Suggested-by: NMichael Matz <matz@suse.de>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1418139917-12722-1-git-send-email-bp@alien8.deSigned-off-by: NIngo Molnar <mingo@kernel.org>

Otherwise, if buggy user code points DS or ES into the TLS
array, they would be corrupted after a context switch.

This also significantly improves the comments and documents some
gotchas in the code.

Before this patch, the both tests below failed.  With this
patch, the es test passes, although the gsbase test still fails.

 ----- begin es test -----

/*
 * Copyright (c) 2014 Andy Lutomirski
 * GPL v2
 */

static unsigned short GDT3(int idx)
{
	return (idx << 3) | 3;
}

static int create_tls(int idx, unsigned int base)
{
	struct user_desc desc = {
		.entry_number    = idx,
		.base_addr       = base,
		.limit           = 0xfffff,
		.seg_32bit       = 1,
		.contents        = 0, /* Data, grow-up */
		.read_exec_only  = 0,
		.limit_in_pages  = 1,
		.seg_not_present = 0,
		.useable         = 0,
	};

	if (syscall(SYS_set_thread_area, &desc) != 0)
		err(1, "set_thread_area");

	return desc.entry_number;
}

int main()
{
	int idx = create_tls(-1, 0);
	printf("Allocated GDT index %d\n", idx);

	unsigned short orig_es;
	asm volatile ("mov %%es,%0" : "=rm" (orig_es));

	int errors = 0;
	int total = 1000;
	for (int i = 0; i < total; i++) {
		asm volatile ("mov %0,%%es" : : "rm" (GDT3(idx)));
		usleep(100);

		unsigned short es;
		asm volatile ("mov %%es,%0" : "=rm" (es));
		asm volatile ("mov %0,%%es" : : "rm" (orig_es));
		if (es != GDT3(idx)) {
			if (errors == 0)
				printf("[FAIL]\tES changed from 0x%hx to 0x%hx\n",
				       GDT3(idx), es);
			errors++;
		}
	}

	if (errors) {
		printf("[FAIL]\tES was corrupted %d/%d times\n", errors, total);
		return 1;
	} else {
		printf("[OK]\tES was preserved\n");
		return 0;
	}
}

 ----- end es test -----

 ----- begin gsbase test -----

/*
 * gsbase.c, a gsbase test
 * Copyright (c) 2014 Andy Lutomirski
 * GPL v2
 */

static unsigned char *testptr, *testptr2;

static unsigned char read_gs_testvals(void)
{
	unsigned char ret;
	asm volatile ("movb %%gs:%1, %0" : "=r" (ret) : "m" (*testptr));
	return ret;
}

int main()
{
	int errors = 0;

	testptr = mmap((void *)0x200000000UL, 1, PROT_READ | PROT_WRITE,
		       MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
	if (testptr == MAP_FAILED)
		err(1, "mmap");

	testptr2 = mmap((void *)0x300000000UL, 1, PROT_READ | PROT_WRITE,
		       MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
	if (testptr2 == MAP_FAILED)
		err(1, "mmap");

	*testptr = 0;
	*testptr2 = 1;

	if (syscall(SYS_arch_prctl, ARCH_SET_GS,
		    (unsigned long)testptr2 - (unsigned long)testptr) != 0)
		err(1, "ARCH_SET_GS");

	usleep(100);

	if (read_gs_testvals() == 1) {
		printf("[OK]\tARCH_SET_GS worked\n");
	} else {
		printf("[FAIL]\tARCH_SET_GS failed\n");
		errors++;
	}

	asm volatile ("mov %0,%%gs" : : "r" (0));

	if (read_gs_testvals() == 0) {
		printf("[OK]\tWriting 0 to gs worked\n");
	} else {
		printf("[FAIL]\tWriting 0 to gs failed\n");
		errors++;
	}

	usleep(100);

	if (read_gs_testvals() == 0) {
		printf("[OK]\tgsbase is still zero\n");
	} else {
		printf("[FAIL]\tgsbase was corrupted\n");
		errors++;
	}

	return errors == 0 ? 0 : 1;
}

 ----- end gsbase test -----
Signed-off-by: NAndy Lutomirski <luto@amacapital.net>
Cc: <stable@vger.kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/509d27c9fec78217691c3dad91cec87e1006b34a.1418075657.git.luto@amacapital.netSigned-off-by: NIngo Molnar <mingo@kernel.org>

The type of "MAX_DMA_PFN" and "xXx_pfn" are both unsigned long
now, so use min() instead of min_t().
Suggested-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NXishi Qiu <qiuxishi@huawei.com>
Cc: Linux MM <linux-mm@kvack.org>
Cc: <dave@sr71.net>
Cc: Rik van Riel <riel@redhat.com>
Link: http://lkml.kernel.org/r/5487AB3F.7050807@huawei.comSigned-off-by: NIngo Molnar <mingo@kernel.org>

This is the usual physical memory layout boot printout:
	...
	[    0.000000] Zone ranges:
	[    0.000000]   DMA      [mem 0x00001000-0x00ffffff]
	[    0.000000]   DMA32    [mem 0x01000000-0xffffffff]
	[    0.000000]   Normal   [mem 0x100000000-0xc3fffffff]
	[    0.000000] Movable zone start for each node
	[    0.000000] Early memory node ranges
	[    0.000000]   node   0: [mem 0x00001000-0x00099fff]
	[    0.000000]   node   0: [mem 0x00100000-0xbf78ffff]
	[    0.000000]   node   0: [mem 0x100000000-0x63fffffff]
	[    0.000000]   node   1: [mem 0x640000000-0xc3fffffff]
	...

This is the log when we set "mem=2G" on the boot cmdline:
	...
	[    0.000000] Zone ranges:
	[    0.000000]   DMA      [mem 0x00001000-0x00ffffff]
	[    0.000000]   DMA32    [mem 0x01000000-0xffffffff]  // should be 0x7fffffff, right?
	[    0.000000]   Normal   empty
	[    0.000000] Movable zone start for each node
	[    0.000000] Early memory node ranges
	[    0.000000]   node   0: [mem 0x00001000-0x00099fff]
	[    0.000000]   node   0: [mem 0x00100000-0x7fffffff]
	...

This patch fixes the printout, the following log shows the right
ranges:
	...
	[    0.000000] Zone ranges:
	[    0.000000]   DMA      [mem 0x00001000-0x00ffffff]
	[    0.000000]   DMA32    [mem 0x01000000-0x7fffffff]
	[    0.000000]   Normal   empty
	[    0.000000] Movable zone start for each node
	[    0.000000] Early memory node ranges
	[    0.000000]   node   0: [mem 0x00001000-0x00099fff]
	[    0.000000]   node   0: [mem 0x00100000-0x7fffffff]
	...
Suggested-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NXishi Qiu <qiuxishi@huawei.com>
Cc: Linux MM <linux-mm@kvack.org>
Cc: <dave@sr71.net>
Cc: Rik van Riel <riel@redhat.com>
Link: http://lkml.kernel.org/r/5487AB3D.6070306@huawei.comSigned-off-by: NIngo Molnar <mingo@kernel.org>

While at it, also refer to the 32 bit entry file.
Signed-off-by: NLuis R. Rodriguez <mcgrof@suse.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: linux-doc@vger.kernel.org
Cc: bpoirier@suse.de
Link: http://lkml.kernel.org/r/1418165684-6226-1-git-send-email-mcgrof@do-not-panic.comSigned-off-by: NIngo Molnar <mingo@kernel.org>

First, there was this: https://bugzilla.kernel.org/show_bug.cgi?id=88001

The problem there was that microcode patches are not being reapplied
after suspend-to-ram. It was important to reapply them, though, because
of for example Haswell's TSX erratum which disabled TSX instructions
with a microcode patch.

A simple fix was fb86b973 ("x86, microcode: Update BSPs microcode
on resume") but, as it is often the case, simple fixes are too
simple. This one causes 32-bit resume to fail:

https://bugzilla.kernel.org/show_bug.cgi?id=88391

Properly fixing this would require more involved changes for which it
is too late now, right before the merge window. Thus, limit this to
64-bit only temporarily.
Signed-off-by: NBorislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1417353999-32236-1-git-send-email-bp@alien8.deSigned-off-by: NThomas Gleixner <tglx@linutronix.de>

commit e6023367 'x86, kaslr: Prevent .bss from overlaping initrd'
broke the cross compile of x86. It added a objdump invocation, which
invokes the host native objdump and ignores an active cross tool
chain.

Use $(OBJDUMP) instead which takes the CROSS_COMPILE prefix into
account.

[ tglx: Massage changelog and use $(OBJDUMP) ]

Fixes: e6023367 'x86, kaslr: Prevent .bss from overlaping initrd'
Signed-off-by: NChris Clayton <chris2553@googlemail.com>
Acked-by: NKees Cook <keescook@chromium.org>
Acked-by: NBorislav Petkov <bp@suse.de>
Cc: Junjie Mao <eternal.n08@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@linux.intel.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/54705C8E.1080400@googlemail.comSigned-off-by: NThomas Gleixner <tglx@linutronix.de>

Pull networking fixes from David Miller:

 1) Fix BUG when decrypting empty packets in mac80211, from Ronald Wahl.

 2) nf_nat_range is not fully initialized and this is copied back to
    userspace, from Daniel Borkmann.

 3) Fix read past end of b uffer in netfilter ipset, also from Dan
    Carpenter.

 4) Signed integer overflow in ipv4 address mask creation helper
    inet_make_mask(), from Vincent BENAYOUN.

 5) VXLAN, be2net, mlx4_en, and qlcnic need ->ndo_gso_check() methods to
    properly describe the device's capabilities, from Joe Stringer.

 6) Fix memory leaks and checksum miscalculations in openvswitch, from
    Pravin B SHelar and Jesse Gross.

 7) FIB rules passes back ambiguous error code for unreachable routes,
    making behavior confusing for userspace.  Fix from Panu Matilainen.

 8) ieee802154fake_probe() doesn't release resources properly on error,
    from Alexey Khoroshilov.

 9) Fix skb_over_panic in add_grhead(), from Daniel Borkmann.

10) Fix access of stale slave pointers in bonding code, from Nikolay
    Aleksandrov.

11) Fix stack info leak in PPP pptp code, from Mathias Krause.

12) Cure locking bug in IPX stack, from Jiri Bohac.

13) Revert SKB fclone memory freeing optimization that is racey and can
    allow accesses to freed up memory, from Eric Dumazet.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (71 commits)
  tcp: Restore RFC5961-compliant behavior for SYN packets
  net: Revert "net: avoid one atomic operation in skb_clone()"
  virtio-net: validate features during probe
  cxgb4 : Fix DCB priority groups being returned in wrong order
  ipx: fix locking regression in ipx_sendmsg and ipx_recvmsg
  openvswitch: Don't validate IPv6 label masks.
  pptp: fix stack info leak in pptp_getname()
  brcmfmac: don't include linux/unaligned/access_ok.h
  cxgb4i : Don't block unload/cxgb4 unload when remote closes TCP connection
  ipv6: delete protocol and unregister rtnetlink when cleanup
  net/mlx4_en: Add VXLAN ndo calls to the PF net device ops too
  bonding: fix curr_active_slave/carrier with loadbalance arp monitoring
  mac80211: minstrel_ht: fix a crash in rate sorting
  vxlan: Inline vxlan_gso_check().
  can: m_can: update to support CAN FD features
  can: m_can: fix incorrect error messages
  can: m_can: add missing delay after setting CCCR_INIT bit
  can: m_can: fix not set can_dlc for remote frame
  can: m_can: fix possible sleep in napi poll
  can: m_can: add missing message RAM initialization
  ...

Pull drm fixes from Dave Airlie:
 "Just two radeon and two intel fixes: endian and regression fixes"

* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
  drm/radeon: fix endian swapping in vbios fetch for tdp table
  drm/radeon: disable native backlight control on pre-r6xx asics (v2)
  drm/i915: Kick fbdev before vgacon
  drm/i915: drop WaSetupGtModeTdRowDispatch:snb

Pull sound fixes from Takashi Iwai:
 "This batch ended up as a relatively high volume due to pending ASoC
  fixes.  But most of fixes there are trivial and/or device- specific
  fixes and quirks, so safe to apply.  The only (ASoC) core fixes are
  the DPCM race fix and the machine-driver matching fix for
  componentization"

* tag 'sound-3.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda - fix the mic mute led problem for Latitude E5550
  ALSA: hda - move DELL_WMI_MIC_MUTE_LED to the tail in the quirk chain
  ASoC: wm_adsp: Avoid attempt to free buffers that might still be in use
  ALSA: usb-audio: Set the Control Selector to SU_SELECTOR_CONTROL for UAC2
  ALSA: usb-audio: Add ctrl message delay quirk for Marantz/Denon devices
  ASoC: sgtl5000: Fix SMALL_POP bit definition
  ASoC: cs42l51: re-hook of_match_table pointer
  ASoC: rt5670: change dapm routes of PLL connection
  ASoC: rt5670: correct the incorrect default values
  ASoC: samsung: Add MODULE_DEVICE_TABLE for Snow
  ASoC: max98090: Correct pclk divisor settings
  ASoC: dpcm: Fix race between FE/BE updates and trigger
  ASoC: Fix snd_soc_find_dai() matching component by name
  ASoC: rsnd: remove unsupported PAUSE flag
  ASoC: fsi: remove unsupported PAUSE flag
  ASoC: rt5645: Mark RT5645_TDM_CTRL_3 as readable
  ASoC: rockchip-i2s: fix infinite loop in rockchip_snd_rxctrl
  ASoC: es8328-i2c: Fix i2c_device_id name field in es8328_id
  ASoC: fsl_asrc: Add reg_defaults for regmap to fix kernel dump

Pull ACPI power management fix from Rafael Wysocki:
 "This is just a one-liner fixing a regression introduced in 3.13 that
  broke system suspend on some Chromebooks.

  On those machines there are ACPI device objects for some I2C devices
  that can wake up the system from sleep states, but that is done via a
  platform-specific mechanism and the ACPI objects don't contain any
  wakeup-related information.  When we started to use ACPI power
  management with those devices (which happened during the 3.13 cycle),
  their configuration confused the ACPI PM layer that returned error
  codes from suspend callbacks for them causing system suspend to fail.

  However, the ACPI PM layer can safely ignore the wakeup setting from a
  device driver if the ACPI object corresponding to the device in
  question doesn't contain wakeup information in which case the driver
  itself is responsible for setting up the device for system wakeup"

* tag 'pm+acpi-3.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / PM: Ignore wakeup setting if the ACPI companion can't wake up

Pull devicetree fixes from Rob Herring:
 "DeviceTree fixes for 3.18:

   - two fixes for OF selftest code
   - fix for PowerPC address parsing to disable work-around except on
     old PowerMACs
   - fix a crash when earlycon is enabled, but no device is found
   - DT documentation fixes and missing vendor prefixes

  All but the doc updates are also for stable"

* tag 'devicetree-fixes-for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  of/selftest: Fix testing when /aliases is missing
  of/selftest: Fix off-by-one error in removal path
  documentation: pinctrl bindings: Fix trivial typo 'abitrary'
  devicetree: bindings: Add vendor prefix for Micron Technology, Inc.
  of: Add vendor prefix for Chips&Media, Inc.
  of/base: Fix PowerPC address parsing hack
  devicetree: vendor-prefixes.txt: fix whitespace
  of: Fix crash if an earlycon driver is not found
  of/irq: Drop obsolete 'interrupts' vs 'interrupts-extended' text
  of: Spelling s/stucture/structure/
  devicetree: bindings: add sandisk to the vendor prefixes

Pull PCI fixes from Bjorn Helgaas:
 "These are fixes for an issue with 64-bit PCI bus addresses on 32-bit
  PAE kernels, an APM X-Gene problem (it depended on a generic change we
  removed before merging), a fix for my hotplug device configuration
  changes, and a devicetree documentation update.

  Resource management:
    - Support 64-bit bridge windows if we have 64-bit dma_addr_t (Yinghai Lu)

  PCI device hotplug:
    - Apply _HPX Link Control settings to all devices with a link (Yinghai Lu)

  Generic host bridge driver:
    - Add DT binding for "linux,pci-domain" property (Lucas Stach)

  APM X-Gene:
    - Assign resources to bus before adding new devices (Duc Dang)"

* tag 'pci-v3.18-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: Support 64-bit bridge windows if we have 64-bit dma_addr_t
  PCI: Apply _HPX Link Control settings to all devices with a link
  PCI: Add missing DT binding for "linux,pci-domain" property
  PCI: xgene: Assign resources to bus before adding new devices

Pull SCSI target fixes from Nicholas Bellinger:
 "Here are the target-pending fixes queued for v3.18-rc6.

  The highlights include:

   - target-core OOPs fix with tcm_qla2xxx + vxworks FC initiators +
     zero length SCSI commands having a transfer direction set.  (Roland
     + Craig Watson)

   - vhost-scsi OOPs fix to explicitly prevent WWPN endpoint configfs
     group removal while qemu still has an active reference.  (Paolo +
     nab)

   - ib_srpt fix for RDMA hardware with lower srp_sq_size limits.
     (Bart)

   - two ib_isert work-arounds for running on ocrdma hardware (Or + Sagi
     + Chris)

   - iscsi-target discovery portal typo + SPC-3 PR Preempt SA key
     matching fix (Steve)"

* git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending:
  IB/isert: Adjust CQ size to HW limits
  target: return CONFLICT only when SA key unmatched
  iser-target: Handle DEVICE_REMOVAL event on network portal listener correctly
  ib_isert: Add max_send_sge=2 minimum for control PDU responses
  srp-target: Retry when QP creation fails with ENOMEM
  iscsi-target: return the correct port in SendTargets
  vhost-scsi: Take configfs group dependency during VHOST_SCSI_SET_ENDPOINT
  target: Don't call TFO->write_pending if data_length == 0

Pull dmaengine fixes from Vinod Koul:
 "We have couple of fixes for dmaengine queued up:
   - dma mempcy fix for dma configuration of sun6i by Maxime
   - pl330 fixes: First the fixing allocation for data buffers by Liviu
     and then Jon's fixe for fifo width and usage"

* 'fixes' of git://git.infradead.org/users/vkoul/slave-dma:
  dmaengine: Fix allocation size for PL330 data buffer depth.
  dmaengine: pl330: Limit MFIFO usage for memcpy to avoid exhausting entries
  dmaengine: pl330: Align DMA memcpy operations to MFIFO width
  dmaengine: sun6i: Fix memcpy operation

Pull MIPS fixes from Ralf Baechle:
 "More 3.18 fixes for MIPS:

   - backtraces were not quite working on on 64-bit kernels
   - loongson needs a different cache coherency setting
   - Loongson 3 is a MIPS64 R2 version but due to erratum we treat is an
     older architecture revision.
   - fix build errors due to undefined references to __node_distances
     for certain configurations.
   - fix instruction decodig in the jump label code.
   - for certain configurations copy_{from,to}_user destroy the content
     of $3 so that register needs to be marked as clobbed by the calling
     code.
   - Hardware Table Walker fixes.
   - fill the delay slot of the last instruction of memcpy otherwise
     whatever ends up there randomly might have undesirable effects.
   - ensure get_user/__get_user always zero the variable to be read even
     in case of an error"

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
  MIPS: jump_label.c: Handle the microMIPS J instruction encoding
  MIPS: jump_label.c: Correct the span of the J instruction
  MIPS: Zero variable read by get_user / __get_user in case of an error.
  MIPS: lib: memcpy: Restore NOP on delay slot before returning to caller
  MIPS: tlb-r4k: Add missing HTW stop/start sequences
  MIPS: asm: uaccess: Add v1 register to clobber list on EVA
  MIPS: oprofile: Fix backtrace on 64-bit kernel
  MIPS: Loongson: Set Loongson-3's ISA level to MIPS64R1
  MIPS: Loongson: Fix the write-combine CCA value setting
  MIPS: IP27: Fix __node_distances undefined error
  MIPS: Loongson3: Fix __node_distances undefined error

Pull powerpc fix from Michael Ellerman:
 "One fix from Scott, he says:

  This patch fixes a crash (introduced in v3.18-rc1) in the FSL MSI driver
  when threaded IRQs are enabled"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux:
  powerpc/fsl_msi: mark the msi cascade handler IRQF_NO_THREAD

Pull x86 fixes from Thomas Gleixner:
 "Misc fixes:
   - gold linker build fix
   - noxsave command line parsing fix
   - bugfix for NX setup
   - microcode resume path bug fix
   - _TIF_NOHZ versus TIF_NOHZ bugfix as discussed in the mysterious
     lockup thread"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, syscall: Fix _TIF_NOHZ handling in syscall_trace_enter_phase1
  x86, kaslr: Handle Gold linker for finding bss/brk
  x86, mm: Set NX across entire PMD at boot
  x86, microcode: Update BSPs microcode on resume
  x86: Require exact match for 'noxsave' command line option

Pull scheduler fixes from Ingo Molnar:
 "Misc fixes: two NUMA fixes, two cputime fixes and an RCU/lockdep fix"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/cputime: Fix clock_nanosleep()/clock_gettime() inconsistency
  sched/cputime: Fix cpu_timer_sample_group() double accounting
  sched/numa: Avoid selecting oneself as swap target
  sched/numa: Fix out of bounds read in sched_init_numa()
  sched: Remove lockdep check in sched_move_task()

Pull perf fixes from Ingo Molnar:
 "Misc fixes: two Intel uncore driver fixes, a CPU-hotplug fix and a
  build dependencies fix"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel/uncore: Fix boot crash on SBOX PMU on Haswell-EP
  perf/x86/intel/uncore: Fix IRP uncore register offsets on Haswell EP
  perf: Fix corruption of sibling list with hotplug
  perf/x86: Fix embarrasing typo

Pull core fix from Ingo Molnar:
 "Fix GENMASK macro shift overflow"

Nobody seems to currently use GENMASK() to fill every single last bit
(which is what overflows) in-tree, and gcc would warn about it, so we
have that going for us.  But apparently there are pending changes that
want this.

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  bitops: Fix shift overflow in GENMASK macros

Commit c3ae62af ("tcp: should drop incoming frames without ACK
flag set") was created to mitigate a security vulnerability in which a
local attacker is able to inject data into locally-opened sockets by
using TCP protocol statistics in procfs to quickly find the correct
sequence number.

This broke the RFC5961 requirement to send a challenge ACK in response
to spurious RST packets, which was subsequently fixed by commit
7b514a88 ("tcp: accept RST without ACK flag").

Unfortunately, the RFC5961 requirement that spurious SYN packets be
handled in a similar manner remains broken.

RFC5961 section 4 states that:

   ... the handling of the SYN in the synchronized state SHOULD be
   performed as follows:

   1) If the SYN bit is set, irrespective of the sequence number, TCP
      MUST send an ACK (also referred to as challenge ACK) to the remote
      peer:

      <SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>

      After sending the acknowledgment, TCP MUST drop the unacceptable
      segment and stop processing further.

   By sending an ACK, the remote peer is challenged to confirm the loss
   of the previous connection and the request to start a new connection.
   A legitimate peer, after restart, would not have a TCB in the
   synchronized state.  Thus, when the ACK arrives, the peer should send
   a RST segment back with the sequence number derived from the ACK
   field that caused the RST.

   This RST will confirm that the remote peer has indeed closed the
   previous connection.  Upon receipt of a valid RST, the local TCP
   endpoint MUST terminate its connection.  The local TCP endpoint
   should then rely on SYN retransmission from the remote end to
   re-establish the connection.

This patch lets SYN packets through the discard added in c3ae62af,
so that spurious SYN packets are properly dealt with as per the RFC.

The challenge ACK is sent unconditionally and is rate-limited, so the
original vulnerability is not reintroduced by this patch.
Signed-off-by: NCalvin Owens <calvinowens@fb.com>
Acked-by: NEric Dumazet <edumazet@google.com>
Acked-by: NNeal Cardwell <ncardwell@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Not sure what I was thinking, but doing anything after
releasing a refcount is suicidal or/and embarrassing.

By the time we set skb->fclone to SKB_FCLONE_FREE, another cpu
could have released last reference and freed whole skb.

We potentially corrupt memory or trap if CONFIG_DEBUG_PAGEALLOC is set.
Reported-by: NChris Mason <clm@fb.com>
Fixes: ce1a4ea3 ("net: avoid one atomic operation in skb_clone()")
Signed-off-by: NEric Dumazet <edumazet@google.com>
Cc: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

We currently trigger BUG when VIRTIO_NET_F_CTRL_VQ
is not set but one of features depending on it is.
That's not a friendly way to report errors to
hypervisors.
Let's check, and fail probe instead.

Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NJason Wang <jasowang@redhat.com>
Acked-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Pablo Neira Ayuso says:

====================
Netfilter fixes for net

The following patchset contains two bugfixes for your net tree, they are:

1) Validate netlink group from nfnetlink to avoid an out of bound array
   access. This should only happen with superuser priviledges though.
   Discovered by Andrey Ryabinin using trinity.

2) Don't push ethernet header before calling the netfilter output hook
   for multicast traffic, this breaks ebtables since it expects to see
   skb->data pointing to the network header, patch from Linus Luessing.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

John W. Linville says:

====================
pull request: wireless 2014-11-20

Please full this little batch of fixes intended for the 3.18 stream!

For the mac80211 patch, Johannes says:

"Here's another last minute fix, for minstrel HT crashing
depending on the value of some uninitialised stack."

On top of that...

Ben Greear fixes an ath9k regression in which a BSSID mask is
miscalculated.

Dmitry Torokhov corrects an error handling routing in brcmfmac which
was checking an unsigned variable for a negative value.

Johannes Berg avoids a build problem in brcmfmac for arches where
linux/unaligned/access_ok.h and asm/unaligned.h conflict.

Mathy Vanhoef addresses another brcmfmac issue so as to eliminate a
use-after-free of the URB transfer buffer if a timeout occurs.

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

Peer priority groups were being reversed, but this was missed in the previous
fix sent out for this issue.

v2 : Previous patch was doing extra unnecessary work, result is the same.
Please ignore previous patch

Fixes :	ee7bc3cd ('cxgb4 : dcb open-lldp interop fixes')
Signed-off-by: NAnish Bhatt <anish@chelsio.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This fixes an old regression introduced by commit
b0d0d915 (ipx: remove the BKL).

When a recvmsg syscall blocks waiting for new data, no data can be sent on the
same socket with sendmsg because ipx_recvmsg() sleeps with the socket locked.

This breaks mars-nwe (NetWare emulator):
- the ncpserv process reads the request using recvmsg
- ncpserv forks and spawns nwconn
- ncpserv calls a (blocking) recvmsg and waits for new requests
- nwconn deadlocks in sendmsg on the same socket

Commit b0d0d915 has simply replaced BKL locking with
lock_sock/release_sock. Unlike now, BKL got unlocked while
sleeping, so a blocking recvmsg did not block a concurrent
sendmsg.

Only keep the socket locked while actually working with the socket data and
release it prior to calling skb_recv_datagram().
Signed-off-by: NJiri Bohac <jbohac@suse.cz>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

When userspace doesn't provide a mask, OVS datapath generates a fully
unwildcarded mask for the flow by copying the flow and setting all bits
in all fields. For IPv6 label, this creates a mask that matches on the
upper 12 bits, causing the following error:

openvswitch: netlink: Invalid IPv6 flow label value (value=ffffffff, max=fffff)

This patch ignores the label validation check for masks, avoiding this
error.
Signed-off-by: NJoe Stringer <joestringer@nicira.com>
Acked-by: NPravin B Shelar <pshelar@nicira.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

pptp_getname() only partially initializes the stack variable sa,
particularly only fills the pptp part of the sa_addr union. The code
thereby discloses 16 bytes of kernel stack memory via getsockname().

Fix this by memset(0)'ing the union before.

Cc: Dmitry Kozlov <xeb@mail.ru>
Signed-off-by: NMathias Krause <minipli@googlemail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

fix one regression and one endian issue.

* 'drm-fixes-3.18' of git://people.freedesktop.org/~agd5f/linux:
  drm/radeon: fix endian swapping in vbios fetch for tdp table
  drm/radeon: disable native backlight control on pre-r6xx asics (v2)

TIF_NOHZ is 19 (i.e. _TIF_SYSCALL_TRACE | _TIF_NOTIFY_RESUME |
_TIF_SINGLESTEP), not (1<<19).

This code is involved in Dave's trinity lockup, but I don't see why
it would cause any of the problems he's seeing, except inadvertently
by causing a different path through entry_64.S's syscall handling.
Signed-off-by: NAndy Lutomirski <luto@amacapital.net>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Dave Jones <davej@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/a6cd3b60a3f53afb6e1c8081b0ec30ff19003dd7.1416434075.git.luto@amacapital.netSigned-off-by: NThomas Gleixner <tglx@linutronix.de>

This is a specific implementation, <asm/unaligned.h> is the
multiplexer that has the arch-specific knowledge of which
of the implementations needs to be used, so include that.

This issue was revealed by kbuild testing
when <asm/unaligned.h> was added in <linux/ieee80211.h>
resulting in redefinition of get_unaligned_be16 (and
probably others).

Cc: stable@vger.kernel.org # v3.17
Reported-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NArend van Spriel <arend@broadcom.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

Value needs to be swapped on BE.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

Just use the acpi interface.  That's what windows uses on this
generation and it's the only thing that seems to work reliably
on these generation parts.

You can still force the native backlight interface by setting
radeon.backlight=1

Bug:
https://bugzilla.kernel.org/show_bug.cgi?id=88501

v2: merge into above if/else block
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

The /aliases node isn't always present in the device tree, but the
unittest code assumes that /aliases is there. Add a check when inserting
the testcase data to see if of_aliases needs to be updated, and undo the
settings when the nodes are removed.
Signed-off-by: NGrant Likely <grant.likely@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Gaurav Minocha <gaurav.minocha.os@gmail.com>
Cc: <stable@vger.kernel.org>

isert has an issue of trying to create a CQ with more CQEs than are
supported by the hardware, that currently results in failures during
isert_device creation during first session login.

This is the isert version of the patch that Minh Tran submitted for
iser, and is simple a workaround required to function with existing
ocrdma hardware.
Signed-off-by: NChris Moore <chris.moore@emulex.com>
Reviewied-by: NSagi Grimberg <sagig@mellanox.com>
Cc: <stable@vger.kernel.org> # 3.10+
Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>

two regression fixes.

* tag 'drm-intel-fixes-2014-11-19' of git://anongit.freedesktop.org/drm-intel:
  drm/i915: Kick fbdev before vgacon
  drm/i915: drop WaSetupGtModeTdRowDispatch:snb

As reported by Dmitry, on some Chromebooks there are devices with
corresponding ACPI objects and with unusual system wakeup
configuration.  Namely, they technically are wakeup-capable, but the
wakeup is handled via a platform-specific out-of-band mechanism and
the ACPI PM layer has no information on the wakeup capability.  As
a result, device_may_wakeup(dev) called from acpi_dev_suspend_late()
returns 'true' for those devices, but the wakeup.flags.valid flag is
unset for the corresponding ACPI device objects, so acpi_device_wakeup()
reproducibly fails for them causing acpi_dev_suspend_late() to return
an error code.  The entire system suspend is then aborted and the
machines in question cannot suspend at all.

Address the problem by ignoring the device_may_wakeup(dev) return
value in acpi_dev_suspend_late() if the ACPI companion of the device
being handled has wakeup.flags.valid unset (in which case it is clear
that the wakeup is supposed to be handled by other means).

This fixes a regression introduced by commit a76e9bd8 (i2c:
attach/detach I2C client device to the ACPI power domain) as the
affected systems could suspend and resume successfully before that
commit.

Fixes: a76e9bd8 (i2c: attach/detach I2C client device to the ACPI power domain)
Reported-by: NDmitry Torokhov <dtor@chromium.org>
Reviewed-by: NDmitry Torokhov <dtor@chromium.org>
Cc: 3.13+ <stable@vger.kernel.org> # 3.13+
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

cxgb4i was returning wrong error and not releasing module reference if remote
end abruptly closed TCP connection. This prevents the cxgb4 network module from
being unloaded, further affecting other network drivers dependent on cxgb4

Sending to net as this affects all cxgb4 based network drivers.
Signed-off-by: NAnish Bhatt <anish@chelsio.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>