Merge misc fixes from Andrew Morton:
 "8 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  MAINTAINERS: demote ARM port to "odd fixes"
  MAINTAINERS: correct rmk's email address
  mm/kmemleak.c: wait for scan completion before disabling free
  mm/memcontrol.c: fix parameter description mismatch
  mm/vmstat.c: fix vmstat_update() preemption BUG
  mm/page_owner: fix recursion bug after changing skip entries
  ipc/shm.c: add split function to shm_vm_ops
  mm, slab: memcg_link the SLAB's kmem_cache

Pull powerpc fixes from Michael Ellerman:
 "Some more powerpc fixes for 4.16. Apologies if this is a bit big at
  rc7, but they're all reasonably important fixes. None are actually for
  new code, so they aren't indicative of 4.16 being in bad shape from
  our point of view.

   - Fix missing AT_BASE_PLATFORM (in auxv) when we're using a new
     firmware interface for describing CPU features.

   - Fix lost pending interrupts due to a race in our interrupt
     soft-masking code.

   - A workaround for a nest MMU bug with TLB invalidations on Power9.

   - A workaround for broadcast TLB invalidations on Power9.

   - Fix a bug in our instruction SLB miss handler, when handling bad
     addresses (eg. >= TASK_SIZE), which could corrupt non-volatile user
     GPRs.

  Thanks to: Aneesh Kumar K.V, Balbir Singh, Benjamin Herrenschmidt,
  Nicholas Piggin"

* tag 'powerpc-4.16-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/64s: Fix i-side SLB miss bad address handler saving nonvolatile GPRs
  powerpc/mm: Fixup tlbie vs store ordering issue on POWER9
  powerpc/mm/radix: Move the functions that does the actual tlbie closer
  powerpc/mm/radix: Remove unused code
  powerpc/mm: Workaround Nest MMU bug with TLB invalidations
  powerpc/mm: Add tracking of the number of coprocessors using a context
  powerpc/64s: Fix lost pending interrupt due to race causing lost update to irq_happened
  powerpc/64s: Fix NULL AT_BASE_PLATFORM when using DT CPU features

Pull ARM SoC fixes from Arnd Bergmann:
 "Here are are a couple of last-minute fixes for 4.16, mostly for
  regressions. As usual, the majory are device tree changes:

   - USB 3 support on rk3399 didn't work and is being reverted for now

   - One fix for an old suspend/resume bug on rk3399

   - A few regulator related fixes on Banana Pi M2, and on imx7d-sdb

   - A boot regression fix for all Aspeed SoCs failing to find their
     memory

   - One more dtc warning fix

  The other changes are:

   - A few updates to the MAINTAINERS file

   - A revert for an incorrect orion5x cleanup

   - Two power management fixes for OMAP"

* tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
  ARM: OMAP: Fix SRAM W+X mapping
  ARM: dts: aspeed: Add default memory node
  mailmap: Update email address for Gregory CLEMENT
  ARM: davinci: fix the GPIO lookup for omapl138-hawk
  MAINTAINERS: Update Tegra IOMMU maintainer
  ARM: dts: imx7d-sdb: Fix regulator-usb-otg2-vbus node name
  ARM: ux500: Fix PMU IRQ regression
  ARM: dts: rockchip: Add missing #sound-dai-cells on rk3288
  Revert "arm64: dts: rockchip: add usb3-phy otg-port support for rk3399"
  arm64: dts: rockchip: Fix rk3399-gru-* s2r (pinctrl hogs, wifi reset)
  ARM: OMAP: Fix dmtimer init for omap1
  MAINTAINERS: update email address for Maxime Ripard
  ARM: dts: sun6i: a31s: bpi-m2: add missing regulators
  ARM: dts: sun6i: a31s: bpi-m2: improve pmic properties

As of the start of 2018, I am no longer paid to support the core 32-bit
ARM architecture code.  This means that this code is no longer
commercially supported, and is now only supported through voluntary
effort.

I will continue to merge patches as and when able, but this will be at a
lower priority than before (which means a longer latency.) I have also
be scaled back the amount of time spent reading email, so email that is
intended for my attention needs to make itself plainly obvious, or I
will miss it.

In an attempt to reduce the amount of email Cc'd to me, exclude
arch/arm/boot/dts from the maintainers patterns, but add entries for the
SolidRun platforms I look after.

Link: http://lkml.kernel.org/r/E1ezkgn-0002fO-52@rmk-PC.armlinux.org.ukSigned-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Correct my email address in the MAINTAINTERS file.

Link: http://lkml.kernel.org/r/E1ezkgi-0002fH-01@rmk-PC.armlinux.org.ukSigned-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

A crash is observed when kmemleak_scan accesses the object->pointer,
likely due to the following race.

  TASK A             TASK B                     TASK C
  kmemleak_write
   (with "scan" and
   NOT "scan=on")
  kmemleak_scan()
                     create_object
                     kmem_cache_alloc fails
                     kmemleak_disable
                     kmemleak_do_cleanup
                     kmemleak_free_enabled = 0
                                                kfree
                                                kmemleak_free bails out
                                                 (kmemleak_free_enabled is 0)
                                                slub frees object->pointer
  update_checksum
  crash - object->pointer
   freed (DEBUG_PAGEALLOC)

kmemleak_do_cleanup waits for the scan thread to complete, but not for
direct call to kmemleak_scan via kmemleak_write.  So add a wait for
kmemleak_scan completion before disabling kmemleak_free, and while at it
fix the comment on stop_scan_thread.

[vinmenon@codeaurora.org: fix stop_scan_thread comment]
  Link: http://lkml.kernel.org/r/1522219972-22809-1-git-send-email-vinmenon@codeaurora.org
Link: http://lkml.kernel.org/r/1522063429-18992-1-git-send-email-vinmenon@codeaurora.orgSigned-off-by: Vinayak Menon <vinmenon@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

There are a couple of places where parameter description and function
name do not match the actual code.  Fix it.

Link: http://lkml.kernel.org/r/1520843448-17347-1-git-send-email-honglei.wang@oracle.comSigned-off-by: Honglei Wang <honglei.wang@oracle.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Attempting to hotplug CPUs with CONFIG_VM_EVENT_COUNTERS enabled can
cause vmstat_update() to report a BUG due to preemption not being
disabled around smp_processor_id().

Discovered on Ubiquiti EdgeRouter Pro with Cavium Octeon II processor.

  BUG: using smp_processor_id() in preemptible [00000000] code:
  kworker/1:1/269
  caller is vmstat_update+0x50/0xa0
  CPU: 0 PID: 269 Comm: kworker/1:1 Not tainted
  4.16.0-rc4-Cavium-Octeon-00009-gf83bbd5-dirty #1
  Workqueue: mm_percpu_wq vmstat_update
  Call Trace:
    show_stack+0x94/0x128
    dump_stack+0xa4/0xe0
    check_preemption_disabled+0x118/0x120
    vmstat_update+0x50/0xa0
    process_one_work+0x144/0x348
    worker_thread+0x150/0x4b8
    kthread+0x110/0x140
    ret_from_kernel_thread+0x14/0x1c

Link: http://lkml.kernel.org/r/1520881552-25659-1-git-send-email-steven.hill@cavium.comSigned-off-by: Steven J. Hill <steven.hill@cavium.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Tejun Heo <htejun@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This patch fixes commit 5f48f0bd ("mm, page_owner: skip unnecessary
stack_trace entries").

Because if we skip first two entries then logic of checking count value
as 2 for recursion is broken and code will go in one depth recursion.

so we need to check only one call of _RET_IP(__set_page_owner) while
checking for recursion.

Current Backtrace while checking for recursion:-

  (save_stack)             from (__set_page_owner)  // (But recursion returns true here)
  (__set_page_owner)       from (get_page_from_freelist)
  (get_page_from_freelist) from (__alloc_pages_nodemask)
  (__alloc_pages_nodemask) from (depot_save_stack)
  (depot_save_stack)       from (save_stack)       // recursion should return true here
  (save_stack)             from (__set_page_owner)
  (__set_page_owner)       from (get_page_from_freelist)
  (get_page_from_freelist) from (__alloc_pages_nodemask+)
  (__alloc_pages_nodemask) from (depot_save_stack)
  (depot_save_stack)       from (save_stack)
  (save_stack)             from (__set_page_owner)
  (__set_page_owner)       from (get_page_from_freelist)

Correct Backtrace with fix:

  (save_stack)             from (__set_page_owner) // recursion returned true here
  (__set_page_owner)       from (get_page_from_freelist)
  (get_page_from_freelist) from (__alloc_pages_nodemask+)
  (__alloc_pages_nodemask) from (depot_save_stack)
  (depot_save_stack)       from (save_stack)
  (save_stack)             from (__set_page_owner)
  (__set_page_owner)       from (get_page_from_freelist)

Link: http://lkml.kernel.org/r/1521607043-34670-1-git-send-email-maninder1.s@samsung.com
Fixes: 5f48f0bd ("mm, page_owner: skip unnecessary stack_trace entries")
Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
Signed-off-by: Vaneet Narang <v.narang@samsung.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@techadventures.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ayush Mittal <ayush.m@samsung.com>
Cc: Prakash Gupta <guptap@codeaurora.org>
Cc: Vinayak Menon <vinmenon@codeaurora.org>
Cc: Vasyl Gomonovych <gomonovych@gmail.com>
Cc: Amit Sahrawat <a.sahrawat@samsung.com>
Cc: <pankaj.m@samsung.com>
Cc: Vaneet Narang <v.narang@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

If System V shmget/shmat operations are used to create a hugetlbfs
backed mapping, it is possible to munmap part of the mapping and split
the underlying vma such that it is not huge page aligned.  This will
untimately result in the following BUG:

  kernel BUG at /build/linux-jWa1Fv/linux-4.15.0/mm/hugetlb.c:3310!
  Oops: Exception in kernel mode, sig: 5 [#1]
  LE SMP NR_CPUS=2048 NUMA PowerNV
  Modules linked in: kcm nfc af_alg caif_socket caif phonet fcrypt
  CPU: 18 PID: 43243 Comm: trinity-subchil Tainted: G         C  E 4.15.0-10-generic #11-Ubuntu
  NIP:  c00000000036e764 LR: c00000000036ee48 CTR: 0000000000000009
  REGS: c000003fbcdcf810 TRAP: 0700   Tainted: G         C  E (4.15.0-10-generic)
  MSR:  9000000000029033 <SF,HV,EE,ME,IR,DR,RI,LE>  CR: 24002222  XER: 20040000
  CFAR: c00000000036ee44 SOFTE: 1
  NIP __unmap_hugepage_range+0xa4/0x760
  LR __unmap_hugepage_range_final+0x28/0x50
  Call Trace:
    0x7115e4e00000 (unreliable)
    __unmap_hugepage_range_final+0x28/0x50
    unmap_single_vma+0x11c/0x190
    unmap_vmas+0x94/0x140
    exit_mmap+0x9c/0x1d0
    mmput+0xa8/0x1d0
    do_exit+0x360/0xc80
    do_group_exit+0x60/0x100
    SyS_exit_group+0x24/0x30
    system_call+0x58/0x6c
  ---[ end trace ee88f958a1c62605 ]---

This bug was introduced by commit 31383c68 ("mm, hugetlbfs:
introduce ->split() to vm_operations_struct").  A split function was
added to vm_operations_struct to determine if a mapping can be split.
This was mostly for device-dax and hugetlbfs mappings which have
specific alignment constraints.

Mappings initiated via shmget/shmat have their original vm_ops
overwritten with shm_vm_ops.  shm_vm_ops functions will call back to the
original vm_ops if needed.  Add such a split function to shm_vm_ops.

Link: http://lkml.kernel.org/r/20180321161314.7711-1-mike.kravetz@oracle.com
Fixes: 31383c68 ("mm, hugetlbfs: introduce ->split() to vm_operations_struct")
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reported-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Reviewed-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Tested-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

All the root caches are linked into slab_root_caches which was
introduced by the commit 510ded33 ("slab: implement slab_root_caches
list") but it missed to add the SLAB's kmem_cache.

While experimenting with opt-in/opt-out kmem accounting, I noticed
system crashes due to NULL dereference inside cache_from_memcg_idx()
while deferencing kmem_cache.memcg_params.memcg_caches.  The upstream
clean kernel will not see these crashes but SLAB should be consistent
with SLUB which does linked its boot caches (kmem_cache_node and
kmem_cache) into slab_root_caches.

Link: http://lkml.kernel.org/r/20180319210020.60289-1-shakeelb@google.com
Fixes: 510ded33 ("slab: implement slab_root_caches list")
Signed-off-by: Shakeel Butt <shakeelb@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull ARM fixes from Russell King:
 "A small number of small fixes for ARM, mostly for some build issues.

  One fix for a regression caused by the cpu hotplug conversion from a
  few kernel versions ago"

* 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 8750/1: deflate_xip_data.sh: minor fixes
  ARM: 8748/1: mm: Define vdso_start, vdso_end as array
  ARM: 8747/1: make CONFIG_DEBUG_WX depend on MMU
  ARM: 8746/1: vfp: Go back to clearing vfp_current_hw_state[]

Pull SCSI fixes from James Bottomley:
 "Two driver fixes (ibmvfc, iscsi_tcp) and a USB fix for devices that
  give the wrong return to Read Capacity and cause a huge log spew.

  The remaining five patches all try to fix commit 84676c1f
  ("genirq/affinity: assign vectors to all possible CPUs") which broke
  the non-mq I/O path"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: iscsi_tcp: set BDI_CAP_STABLE_WRITES when data digest enabled
  scsi: sd: Remember that READ CAPACITY(16) succeeded
  scsi: ibmvfc: Avoid unnecessary port relogin
  scsi: virtio_scsi: unify scsi_host_template
  scsi: virtio_scsi: fix IO hang caused by automatic irq vector affinity
  scsi: core: introduce force_blk_mq
  scsi: megaraid_sas: fix selection of reply queue
  scsi: hpsa: fix selection of reply queue

Merge tag 'sunxi-fixes-for-4.16' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/sunxi/linux into fixes

Pull "Allwinner Fixes for 4.16" from Maxime Ripard:

The first and second patches fix the regulator support for the Bananapi M2
board.

The last one updates my email address in MAINTAINERS.

* tag 'sunxi-fixes-for-4.16' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/sunxi/linux:
  MAINTAINERS: update email address for Maxime Ripard
  ARM: dts: sun6i: a31s: bpi-m2: add missing regulators
  ARM: dts: sun6i: a31s: bpi-m2: improve pmic properties

Merge tag 'omap-for-v4.16/sram-fix-signed' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into fixes

Pull "Two fixes for omap variants for v4.16-rc cycle" from Tony Lindgren:

Fix insecure W+X mapping warning for SRAM for omaps that
don't yet use drivers/misc/*sram*.c code. An earlier attempt
at fixing this turned out to cause problems with PM on omap3,
this version works with PM on omap3.

Also fix dmtimer probe for omap16xx devices that was noticed
with the pending dmtimer move to drivers. It seems this has
been broken for a while and is a non-critical for booting.
It is needed for PM on omap16xx though.

* tag 'omap-for-v4.16/sram-fix-signed' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
  ARM: OMAP: Fix SRAM W+X mapping
  ARM: OMAP: Fix dmtimer init for omap1

Merge tag 'tegra-for-4.17-misc' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tegra/linux into fixes

Pull "ARM: tegra: Miscellaneous changes for v4.17-rc1" from Thierry Reding:

This contains a single patch to update the MAINTAINERS entry for the
Tegra SMMU driver.

* tag 'tegra-for-4.17-misc' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
  MAINTAINERS: Update Tegra IOMMU maintainer

The SLB bad address handler's trap number fixup does not preserve the
low bit that indicates nonvolatile GPRs have not been saved. This
leads save_nvgprs to skip saving them, and subsequent functions and
return from interrupt will think they are saved.

This causes kernel branch-to-garbage debugging to not have correct
registers, can also cause userspace to have its registers clobbered
after a segfault.

Fixes: f0f558b1 ("powerpc/mm: Preserve CFAR value on SLB miss caused by access to bogus address")
Cc: stable@vger.kernel.org # v4.9+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

Pull dmaengine fix from Vinod Koul:
 "One small fix for stm32-dmamux fixing buffer overflow"

* tag 'dmaengine-fix-4.16-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/slave-dma:
  dmaengine: stm32-dmamux: fix a potential buffer overflow

Pull x86 and PTI fixes from Ingo Molnar:
 "Misc fixes:

   - fix EFI pagetables freeing

   - fix vsyscall pagetable setting on Xen PV guests

   - remove ancient CONFIG_X86_PPRO_FENCE=y - x86 is TSO again

   - fix two binutils (ld) development version related incompatibilities

   - clean up breakpoint handling

   - fix an x86 self-test"

* 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/entry/64: Don't use IST entry for #BP stack
  x86/efi: Free efi_pgd with free_pages()
  x86/vsyscall/64: Use proper accessor to update P4D entry
  x86/cpu: Remove the CONFIG_X86_PPRO_FENCE=y quirk
  x86/boot/64: Verify alignment of the LOAD segment
  x86/build/64: Force the linker to use 2MB page size
  selftests/x86/ptrace_syscall: Fix for yet more glibc interference

Pull timer fix from Ingo Molnar:
 "Make posix clock ID usage Spectre-safe"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  posix-timers: Protect posix clock array access against speculation

Pull scheduler fixes from Ingo Molnar:
 "Two sched debug output related fixes: a console output fix and
  formatting fixes"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/debug: Adjust newlines for better alignment
  sched/debug: Fix per-task line continuation for console output

Pull perf fixes from Ingo Molnar:
 "Misc kernel side fixes.

  Generic:
   - cgroup events counting fix

  x86:
   - Intel PMU truncated-parameter fix

   - RDPMC fix

   - API naming fix/rename

   - uncore driver big-hardware PCI enumeration fix

   - uncore driver filter constraint fix"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/cgroup: Fix child event counting bug
  perf/x86/intel/uncore: Fix multi-domain PCI CHA enumeration bug on Skylake servers
  perf/x86/intel: Rename confusing 'freerunning PEBS' API and implementation to 'large PEBS'
  perf/x86/intel/uncore: Add missing filter constraint for SKX CHA event
  perf/x86/intel: Don't accidentally clear high bits in bdw_limit_period()
  perf/x86/intel: Disable userspace RDPMC usage for large PEBS

Pull locking fixes from Ingo Molnar:
 "Two fixes: tighten up a jump-labels warning to not trigger on certain
  modules and fix confusing (and non-existent) mutex API documentation"

* 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  jump_label: Disable jump labels in __exit code
  locking/mutex: Improve documentation

Tabs on a console with long lines do not wrap properly, so correctly
account for the line length when computing the tab placement location.
Reported-by: James Holderness <j4_james@hotmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull mqueuefs revert from Eric Biederman:
 "This fixes a regression that came in the merge window for v4.16.

  The problem is that the permissions for mounting and using the
  mqueuefs filesystem are broken. The necessary permission check is
  missing letting people who should not be able to mount mqueuefs mount
  mqueuefs. The field sb->s_user_ns is set incorrectly not allowing the
  mounter of mqueuefs to remount and otherwise have proper control over
  the filesystem.

  Al Viro and I see the path to the necessary fixes differently and I am
  not even certain at this point he actually sees all of the necessary
  fixes. Given a couple weeks we can probably work something out but I
  don't see the review being resolved in time for the final v4.16. I
  don't want v4.16 shipping with a nasty regression. So unfortunately I
  am sending a revert"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  Revert "mqueue: switch to on-demand creation of internal mount"

This reverts commit 36735a6a.

Aleksa Sarai <asarai@suse.de> writes:
> [REGRESSION v4.16-rc6] [PATCH] mqueue: forbid unprivileged user access to internal mount
>
> Felix reported weird behaviour on 4.16.0-rc6 with regards to mqueue[1],
> which was introduced by 36735a6a ("mqueue: switch to on-demand
> creation of internal mount").
>
> Basically, the reproducer boils down to being able to mount mqueue if
> you create a new user namespace, even if you don't unshare the IPC
> namespace.
>
> Previously this was not possible, and you would get an -EPERM. The mount
> is the *host* mqueue mount, which is being cached and just returned from
> mqueue_mount(). To be honest, I'm not sure if this is safe or not (or if
> it was intentional -- since I'm not familiar with mqueue).
>
> To me it looks like there is a missing permission check. I've included a
> patch below that I've compile-tested, and should block the above case.
> Can someone please tell me if I'm missing something? Is this actually
> safe?
>
> [1]: https://github.com/docker/docker/issues/36674

The issue is a lot deeper than a missing permission check.  sb->s_user_ns
was is improperly set as well.  So in addition to the filesystem being
mounted when it should not be mounted, so things are not allow that should
be.

We are practically to the release of 4.16 and there is no agreement between
Al Viro and myself on what the code should looks like to fix things properly.
So revert the code to what it was before so that we can take our time
and discuss this properly.

Fixes: 36735a6a ("mqueue: switch to on-demand creation of internal mount")
Reported-by: Felix Abecassis <fabecassis@nvidia.com>
Reported-by: Aleksa Sarai <asarai@suse.de>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

Pull pin control fixes from Linus Walleij:
 "Two fixes for pin control for v4.16:

   - Renesas SH-PFC: remove a duplicate clkout pin which was causing
     crashes

   - fix Samsung out of bounds exceptions"

* tag 'pinctrl-v4.16-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
  pinctrl: samsung: Validate alias coming from DT
  pinctrl: sh-pfc: r8a7795: remove duplicate of CLKOUT pin in pinmux_pins[]

Send nm complaints about broken pipe (when sed exits early) to /dev/null.
All errors should be printed to stderr.
Don't trap on normal exit so the trap can return an error code.
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Tested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Define vdso_start, vdso_end as array to avoid compile-time analysis error
for the case of built with CONFIG_FORTIFY_SOURCE.

and, since vdso_start, vdso_end are used in vdso.c only,
move extern-declaration from vdso.h to vdso.c.

If kernel is built with CONFIG_FORTIFY_SOURCE,
compile-time error happens at this code.
- if (memcmp(&vdso_start, "177ELF", 4))

The size of "&vdso_start" is recognized as 1 byte, but n is 4,
So that compile-time error is reported.
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jinbum Park <jinb.park7@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Without CONFIG_MMU, this results in a build failure:

./arch/arm/include/asm/memory.h:92:23: error: initializer element is not constant
 #define VECTORS_BASE  vectors_base
arch/arm/mm/dump.c:32:4: note: in expansion of macro 'VECTORS_BASE'
  { VECTORS_BASE, "Vectors" },

arch/arm/mm/dump.c:71:11: error: 'L_PTE_USER' undeclared here (not in a function); did you mean 'VTIME_USER'?
   .mask = L_PTE_USER,
           ^~~~~~~~~~

Obviously the feature only makes sense with an MMU, so let's add the
dependency here.

Fixes: a8e53c15 ("ARM: 8737/1: mm: dump: add checking for writable and executable")
Acked-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Commit 384b38b6 ("ARM: 7873/1: vfp: clear vfp_current_hw_state
for dying cpu") fixed the cpu dying notifier by clearing
vfp_current_hw_state[]. However commit e5b61baf ("arm: Convert VFP
hotplug notifiers to state machine") incorrectly used the original
vfp_force_reload() function in the cpu dying notifier.

Fix it by going back to clearing vfp_current_hw_state[].

Fixes: e5b61baf ("arm: Convert VFP hotplug notifiers to state machine")
Cc: linux-stable <stable@vger.kernel.org>
Reported-by: Kohji Okuno <okuno.kohji@jp.panasonic.com>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Pull kprobe fixes from Steven Rostedt:
 "The documentation for kprobe events says that symbol offets can take
  both a + and - sign to get to befor and after the symbol address.

  But in actuality, the code does not support the minus. This fixes that
  issue, and adds a few more selftests to kprobe events"

* tag 'trace-v4.16-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  selftests: ftrace: Add a testcase for probepoint
  selftests: ftrace: Add a testcase for string type with kprobe_event
  selftests: ftrace: Add probe event argument syntax testcase
  tracing: probeevent: Fix to support minus offset from symbol

There's nothing IST-worthy about #BP/int3.  We don't allow kprobes
in the small handful of places in the kernel that run at CPL0 with
an invalid stack, and 32-bit kernels have used normal interrupt
gates for #BP forever.

Furthermore, we don't allow kprobes in places that have usergs while
in kernel mode, so "paranoid" is also unnecessary.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org

The efi_pgd is allocated as PGD_ALLOCATION_ORDER pages and therefore must
also be freed as PGD_ALLOCATION_ORDER pages with free_pages().

Fixes: d9e9a641 ("x86/mm/pti: Allocate a separate user PGD")
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/1521746333-19593-1-git-send-email-longman@redhat.com

Pull MIPS fixes from James Hogan:
 "Another miscellaneous pile of MIPS fixes for 4.16:

   - lantiq: fixes for clocks and Amazon SE (4.14)

   - ralink: fix booting on MT7621 (4.5)

   - ralink: fix halt (3.9)"

* tag 'mips_fixes_4.16_5' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/mips:
  MIPS: ralink: Fix booting on MT7621
  MIPS: ralink: Remove ralink_halt()
  MIPS: lantiq: ase: Enable MFD_SYSCON
  MIPS: lantiq: Enable AHB Bus for USB
  MIPS: lantiq: Fix Danube USB clock

Pull VFIO fix from Alex Williamson:
 "Revert masking INTx where it cannot be enabled - it plays poorly with
  SR-IOV VFs and presumes DisINTx support"

* tag 'vfio-v4.16-rc7' of git://github.com/awilliam/linux-vfio:
  Revert: "vfio-pci: Mask INTx if a device is not capabable of enabling it"

Pull MTD fixes from Boris Brezillon:

 - Fix several problems in the fsl_ifc NAND controller driver

 - Fix misuse of mtd_ooblayout_ecc() in mtdchar.c

* tag 'mtd/fixes-for-4.16-rc7' of git://git.infradead.org/linux-mtd:
  mtd: nand: fsl_ifc: Read ECCSTAT0 and ECCSTAT1 registers for IFC 2.0
  mtd: nand: fsl_ifc: Fix eccstat array overflow for IFC ver >= 2.0.0
  mtd: nand: fsl_ifc: Fix nand waitfunc return value
  mtdchar: fix usage of mtd_ooblayout_ecc()

Pull staging/IIO fixes from Greg KH:
 "Here are a few small staging and IIO fixes for various reported
  issues.

  All of them are tiny, the majority being iio driver fixes for small
  issues, and one staging driver fix for a memory corruption issue.

  All have been in linux-next with no reported issues"

* tag 'staging-4.16-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: ncpfs: memory corruption in ncp_read_kernel()
  iio: st_pressure: st_accel: pass correct platform data to init
  Revert "iio: accel: st_accel: remove redundant pointer pdata"
  iio: adc: meson-saradc: unlock on error in meson_sar_adc_lock()
  dt-bindings: iio: adc: sd-modulator: fix io-channel-cells
  iio: adc: stm32-dfsdm: fix multiple channel initialization
  iio: adc: stm32-dfsdm: fix clock source selection
  iio: adc: stm32-dfsdm: fix call to stop channel
  iio: adc: stm32-dfsdm: fix compatible data use
  iio: chemical: ccs811: Corrected firmware boot/application mode transition

Pull hyperv fix from Greg KH:
 "This is a single hyperv bugfix for 4.16-rc7.

  It resolves an issue with the ring-buffer signaling to resolve
  reported problems.

  It's been in linux-next for a while now with no reported issues"

* tag 'char-misc-4.16-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  Drivers: hv: vmbus: Fix ring buffer signaling