Daniel Borkmann says:

====================
Two generic xdp related follow-ups

Two follow-ups for the generic XDP API, would be great if
both could still be considered, since the XDP API is not
frozen yet. For details please see individual patches.

v1 -> v2:
  - Implemented feedback from Jakub Kicinski (reusing
    attribute on dump), thanks!
  - Rest as is.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

While working on the iproute2 generic XDP frontend, I noticed that
as of right now it's possible to have native *and* generic XDP
programs loaded both at the same time for the case when a driver
supports native XDP.

The intended model for generic XDP from b5cdae32 ("net: Generic
XDP") is, however, that only one out of the two can be present at
once which is also indicated as such in the XDP netlink dump part.
The main rationale for generic XDP is to ease accessibility (in
case a driver does not yet have XDP support) and to generically
provide a semantical model as an example for driver developers
wanting to add XDP support. The generic XDP option for an XDP
aware driver can still be useful for comparing and testing both
implementations.

However, it is not intended to have a second XDP processing stage
or layer with exactly the same functionality of the first native
stage. Only reason could be to have a partial fallback for future
XDP features that are not supported yet in the native implementation
and we probably also shouldn't strive for such fallback and instead
encourage native feature support in the first place. Given there's
currently no such fallback issue or use case, lets not go there yet
if we don't need to.

Therefore, change semantics for loading XDP and bail out if the
user tries to load a generic XDP program when a native one is
present and vice versa. Another alternative to bailing out would
be to handle the transition from one flavor to another gracefully,
but that would require to bring the device down, exchange both
types of programs, and bring it up again in order to avoid a tiny
window where a packet could hit both hooks. Given this complicates
the logic for just a debugging feature in the native case, I went
with the simpler variant.

For the dump, remove IFLA_XDP_FLAGS that was added with b5cdae32
and reuse IFLA_XDP_ATTACHED for indicating the mode. Dumping all
or just a subset of flags that were used for loading the XDP prog
is suboptimal in the long run since not all flags are useful for
dumping and if we start to reuse the same flag definitions for
load and dump, then we'll waste bit space. What we really just
want is to dump the mode for now.

Current IFLA_XDP_ATTACHED semantics are: nothing was installed (0),
a program is running at the native driver layer (1). Thus, add a
mode that says that a program is running at generic XDP layer (2).
Applications will handle this fine in that older binaries will
just indicate that something is attached at XDP layer, effectively
this is similar to IFLA_XDP_FLAGS attr that we would have had
modulo the redundancy.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

After commit b5cdae32 ("net: Generic XDP") we automatically fall
back to a generic XDP variant if the driver does not support native
XDP. Allow for an option where the user can specify that always the
native XDP variant should be selected and in case it's not supported
by a driver, just bail out.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

We do not want to use the architecture's type.h header when
building BPF programs which are always 64-bit.
Signed-off-by: David S. Miller <davem@davemloft.net>

David S. Miller says:

====================
bpf: Add alignment tracker to verifier.

First we add the alignment tracking logic to the verifier.

Next, we work on building up infrastructure to facilitate regression
testing of this facility.

Finally, we add the "test_align" test case.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>

This allows a test case to load a BPF program and unconditionally
acquire the verifier log.

It also allows specification of the strict alignment flag.
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>

Add a new field, "prog_flags", and an initial flag value
BPF_F_STRICT_ALIGNMENT.

When set, the verifier will enforce strict pointer alignment
regardless of the setting of CONFIG_EFFICIENT_UNALIGNED_ACCESS.

The verifier, in this mode, will also use a fixed value of "2" in
place of NET_IP_ALIGN.

This facilitates test cases that will exercise and validate this part
of the verifier even when run on architectures where alignment doesn't
matter.
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>

If log_level > 1, do a state dump every instruction and emit it in
a more compact way (without a leading newline).

This will facilitate more sophisticated test cases which inspect the
verifier log for register state.
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>

Currently if we add only constant values to pointers we can fully
validate the alignment, and properly check if we need to reject the
program on !CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS architectures.

However, once an unknown value is introduced we only allow byte sized
memory accesses which is too restrictive.

Add logic to track the known minimum alignment of register values,
and propagate this state into registers containing pointers.

The most common paradigm that makes use of this new logic is computing
the transport header using the IP header length field.  For example:

	struct ethhdr *ep = skb->data;
	struct iphdr *iph = (struct iphdr *) (ep + 1);
	struct tcphdr *th;
 ...
	n = iph->ihl;
	th = ((void *)iph + (n * 4));
	port = th->dest;

The existing code will reject the load of th->dest because it cannot
validate that the alignment is at least 2 once "n * 4" is added the
the packet pointer.

In the new code, the register holding "n * 4" will have a reg->min_align
value of 4, because any value multiplied by 4 will be at least 4 byte
aligned.  (actually, the eBPF code emitted by the compiler in this case
is most likely to use a shift left by 2, but the end result is identical)

At the critical addition:

	th = ((void *)iph + (n * 4));

The register holding 'th' will start with reg->off value of 14.  The
pointer addition will transform that reg into something that looks like:

	reg->aux_off = 14
	reg->aux_off_align = 4

Next, the verifier will look at the th->dest load, and it will see
a load offset of 2, and first check:

	if (reg->aux_off_align % size)

which will pass because aux_off_align is 4.  reg_off will be computed:

	reg_off = reg->off;
 ...
		reg_off += reg->aux_off;

plus we have off==2, and it will thus check:

	if ((NET_IP_ALIGN + reg_off + off) % size != 0)

which evaluates to:

	if ((NET_IP_ALIGN + 14 + 2) % size != 0)

On strict alignment architectures, NET_IP_ALIGN is 2, thus:

	if ((2 + 14 + 2) % size != 0)

which passes.

These pointer transformations and checks work regardless of whether
the constant offset or the variable with known alignment is added
first to the pointer register.
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>

Shubham was recently asking on netdev why in arm64 JIT we don't multiply
the index for accessing the tail call map by 8. That led me into testing
out arm64 JIT wrt tail calls and it turned out I got a NULL pointer
dereference on the tail call.

The buggy access is at:

  prog = array->ptrs[index];
  if (prog == NULL)
      goto out;

  [...]
  00000060:  d2800e0a  mov x10, #0x70 // #112
  00000064:  f86a682a  ldr x10, [x1,x10]
  00000068:  f862694b  ldr x11, [x10,x2]
  0000006c:  b40000ab  cbz x11, 0x00000080
  [...]

The code triggering the crash is f862694b. x1 at the time contains the
address of the bpf array, x10 offsetof(struct bpf_array, ptrs). Meaning,
above we load the pointer to the program at map slot 0 into x10. x10
can then be NULL if the slot is not occupied, which we later on try to
access with a user given offset in x2 that is the map index.

Fix this by emitting the following instead:

  [...]
  00000060:  d2800e0a  mov x10, #0x70 // #112
  00000064:  8b0a002a  add x10, x1, x10
  00000068:  d37df04b  lsl x11, x2, #3
  0000006c:  f86b694b  ldr x11, [x10,x11]
  00000070:  b40000ab  cbz x11, 0x00000084
  [...]

This basically adds the offset to ptrs to the base address of the bpf
array we got and we later on access the map with an index * 8 offset
relative to that. The tail call map itself is basically one large area
with meta data at the head followed by the array of prog pointers.
This makes tail calls working again, tested on Cavium ThunderX ARMv8.

Fixes: ddb55992 ("arm64: bpf: implement bpf_tail_call() helper")
Reported-by: Shubham Bansal <illusionist.neo@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

Fix error path while dma open channel issue. Also, no need to check output
on NULL if it's never returned.
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Julian Wiedmann says:

====================
s390/net fixes

some qeth fixes for -net, the OSM/OSN one being the most crucial.
Please also queue these up for stable.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

commit 5f78e29c ("qeth: optimize IP handling in rx_mode callback")
added new hash tables, but missed to initialize them.

Fixes: 5f78e29c ("qeth: optimize IP handling in rx_mode callback")
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Reviewed-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Access card->dev only after checking whether's its valid.
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

commit b4d72c08 ("qeth: bridgeport support - basic control")
broke the support for OSM and OSN devices as follows:

As OSM and OSN are L2 only, qeth_core_probe_device() does an early
setup by loading the l2 discipline and calling qeth_l2_probe_device().
In this context, adding the l2-specific bridgeport sysfs attributes
via qeth_l2_create_device_attributes() hits a BUG_ON in fs/sysfs/group.c,
since the basic sysfs infrastructure for the device hasn't been
established yet.

Note that OSN actually has its own unique sysfs attributes
(qeth_osn_devtype), so the additional attributes shouldn't be created
at all.
For OSM, add a new qeth_l2_devtype that contains all the common
and l2-specific sysfs attributes.
When qeth_core_probe_device() does early setup for OSM or OSN, assign
the corresponding devtype so that the ccwgroup probe code creates the
full set of sysfs attributes.
This allows us to skip qeth_l2_create_device_attributes() in case
of an early setup.

Any device that can't do early setup will initially have only the
generic sysfs attributes, and when it's probed later
qeth_l2_probe_device() adds the l2-specific attributes.

If an early-setup device is removed (by calling ccwgroup_ungroup()),
device_unregister() will - using the devtype - delete the
l2-specific attributes before qeth_l2_remove_device() is called.
So make sure to not remove them twice.

What complicates the issue is that qeth_l2_probe_device() and
qeth_l2_remove_device() is also called on a device when its
layer2 attribute changes (ie. its layer mode is switched).
For early-setup devices this wouldn't work properly - we wouldn't
remove the l2-specific attributes when switching to L3.
But switching the layer mode doesn't actually make any sense;
we already decided that the device can only operate in L2!
So just refuse to switch the layer mode on such devices. Note that
OSN doesn't have a layer2 attribute, so we only need to special-case
OSM.

Based on an initial patch by Ursula Braun.

Fixes: b4d72c08 ("qeth: bridgeport support - basic control")
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When setting up the device from within the layer discipline's
probe routine, creating the layer-specific sysfs attributes can fail.
Report this error back to the caller, and handle it by
releasing the layer discipline.
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
[jwi: updated commit msg, moved an OSN change to a subsequent patch]
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

There is a potential unnecessary refcount decrement on error path of
put_device(&pb->mii_bus->dev), as it is possible to avoid the
of_mdio_find_bus() call if mux_bus is specified by the calling function.

The same put_device() is not called in the error path if the
devm_kzalloc of pb fails.  This caused the variable used in the
put_device() to be changed, as the pb pointer was obviously not set up.

There is an unnecessary of_node_get() on child_bus_node if the
of_mdiobus_register() is successful, as the
for_each_available_child_of_node() automatically increments this.
Thus the refcount on this node will always be +1 more than it should be.

There is no of_node_put() on child_bus_node if the of_mdiobus_register()
call fails.

Finally, it is lacking devm_kfree() of pb in the error path.  While this
might not be technically necessary, it was present in other parts of the
function.  So, I am adding it where necessary to make it uniform.
Signed-off-by: Jon Mason <jon.mason@broadcom.com>
Fixes: f20e6657 ("mdio: mux: Enhanced MDIO mux framework for integrated multiplexers")
Fixes: 0ca2997d ("netdev/of/phy: Add MDIO bus multiplexer support.")
Signed-off-by: David S. Miller <davem@davemloft.net>

Like commit 657831ff ("dccp/tcp: do not inherit mc_list from parent")
we should clear ipv6_mc_list etc. for IPv6 sockets too.

Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Currently rcode is being initialized to NX_RCODE_SUCCESS and later it
is checked to see if it is not NX_RCODE_SUCCESS which is never true. It
appears that there is an unintentional missing assignment of rcode from
the return of the call to netxen_issue_cmd() that was dropped in
an earlier fix, so add it in.

Detected by CoverityScan, CID#401900 ("Logically dead code")

Fixes: 2dcd5d95 ("netxen_nic: fix cdrp race condition")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The qca_spi driver causes alignment issues on ARM devices.
So fix this by using netdev_alloc_skb_ip_align().
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Fixes: 291ab06e ("net: qualcomm: new Ethernet over SPI driver for QCA7000")
Signed-off-by: David S. Miller <davem@davemloft.net>

The current codes only deal with the case that the skb is dropped, it
may meet one use-after-free issue when NF_HOOK returns 0 that means
the skb is stolen by one netfilter rule or hook.

When one netfilter rule or hook stoles the skb and return NF_STOLEN,
it means the skb is taken by the rule, and other modules should not
touch this skb ever. Maybe the skb is queued or freed directly by the
rule.

Now uses the nf_hook instead of NF_HOOK to get the result of netfilter,
and check the return value of nf_hook. Only when its value equals 1, it
means the skb could go ahead. Or reset the skb as NULL.

BTW, because vrf_rcv_finish is empty function, so needn't invoke it
even though nf_hook returns 1. But we need to modify vrf_rcv_finish
to deal with the NF_STOLEN case.

There are two cases when skb is stolen.
1. The skb is stolen and freed directly.
   There is nothing we need to do, and vrf_rcv_finish isn't invoked.
2. The skb is queued and reinjected again.
   The vrf_rcv_finish would be invoked as okfn, so need to free the
   skb in it.
Signed-off-by: Gao Feng <gfree.wind@vip.163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pull IDE updates from David Miller:
 "Two small cleanups in the IDE layer"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide:
  ide: don't call memcpy with the same source and destination
  ide: use setup_timer

Pull sparc updates from David Miller:
 "sparc changes, including a bug fix for handling exceptions during
  bzero on some sparc64 cpus"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  sparc64: fix fault handling in NGbzero.S and GENbzero.S
  sparc: use memdup_user_nul in sun4m LED driver
  sparc: Remove redundant tests in boot_flags_init().

Pull networking fixes from David Miller:

 1) Fix multiqueue in stmmac driver on PCI, from Andy Shevchenko.

 2) cdc_ncm doesn't actually fully zero out the padding area is
    allocates on TX, from Jim Baxter.

 3) Don't leak map addresses in BPF verifier, from Daniel Borkmann.

 4) If we randomize TCP timestamps, we have to do it everywhere
    including SYN cookies. From Eric Dumazet.

 5) Fix "ethtool -S" crash in aquantia driver, from Pavel Belous.

 6) Fix allocation size for ntp filter bitmap in bnxt_en driver, from
    Dan Carpenter.

 7) Add missing memory allocation return value check to DSA loop driver,
    from Christophe Jaillet.

 8) Fix XDP leak on driver unload in qed driver, from Suddarsana Reddy
    Kalluru.

 9) Don't inherit MC list from parent inet connection sockets, another
    syzkaller spotted gem. Fix from Eric Dumazet.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (43 commits)
  dccp/tcp: do not inherit mc_list from parent
  qede: Split PF/VF ndos.
  qed: Correct doorbell configuration for !4Kb pages
  qed: Tell QM the number of tasks
  qed: Fix VF removal sequence
  qede: Fix XDP memory leak on unload
  net/mlx4_core: Reduce harmless SRIOV error message to debug level
  net/mlx4_en: Avoid adding steering rules with invalid ring
  net/mlx4_en: Change the error print to debug print
  drivers: net: wimax: i2400m: i2400m-usb: Use time_after for time comparison
  DECnet: Use container_of() for embedded struct
  Revert "ipv4: restore rt->fi for reference counting"
  net: mdio-mux: bcm-iproc: call mdiobus_free() in error path
  net: ethernet: ti: cpsw: adjust cpsw fifos depth for fullduplex flow control
  ipv6: reorder ip6_route_dev_notifier after ipv6_dev_notf
  net: cdc_ncm: Fix TX zero padding
  stmmac: pci: split out common_default_data() helper
  stmmac: pci: RX queue routing configuration
  stmmac: pci: TX and RX queue priority configuration
  stmmac: pci: set default number of rx and tx queues
  ...

Pull dmaengine updates from Vinod Koul:
 "This time again a smaller update consisting of:

   - support for TI DA8xx dma controller and updates to the cppi driver

   - updates on bunch of drivers like xilinx, pl08x, stm32-dma, mv_xor,
     ioat, dmatest"

* tag 'dmaengine-4.12-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (35 commits)
  dmaengine: pl08x: remove lock documentation
  dmaengine: pl08x: fix pl08x_dma_chan_state documentation
  dmaengine: pl08x: Use the BIT() macro consistently
  dmaengine: pl080: Fix some missing kerneldoc
  dmaengine: pl080: Cut some unused defines
  dmaengine: dmatest: Add check for supported buffer count (sg_buffers)
  dmaengine: dmatest: Select DMA_ENGINE_RAID as its needed for the slave_sg test
  dmaengine: virt-dma: Convert to use list_for_each_entry_safe()
  dma-debug: use offset_in_page() macro
  dmaengine: mv_xor: use offset_in_page() macro
  dmaengine: dmatest: use offset_in_page() macro
  dmaengine: sun4i: fix invalid argument
  dmaengine: ioat: use setup_timer
  dmaengine: cppi41: Fix an Oops happening in cppi41_dma_probe()
  dmaengine: pl330: remove pdata based initialization
  dmaengine: cppi: fix build error due to bad variable
  dmaengine: imx-sdma: add 1ms delay to ensure SDMA channel is stopped
  dmaengine: cppi41: use managed functions devm_*()
  dmaengine: cppi41: fix cppi41_dma_tx_status() logic
  dmaengine: qcom_hidma: pause the channel on shutdown
  ...

Merge tag 'pwm/for-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm updates from Thierry Reding:
 "Adds a new driver for the PWM controller found on MediaTek SoCs and
  extends support for the Atmel PWM controller to include the SAMA5D2.

  Some existing drivers have been migrated to the atomic API and a few
  others see miscellaneous improvements"

* tag 'pwm/for-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
  pwm: tegra: Read PWM clock source rate in driver init
  pwm: pca9685: Fix GPIO-only operation
  pwm: mediatek: Don't explicitly set .owner
  pwm: tegra: Avoid potential overflow for short periods
  pwm: tegra: Add support to configure pin state in suspends/resume
  pwm: tegra: Add DT binding details to configure pin in suspends/resume
  pwm: tegra: Increase precision in PWM rate calculation
  pwm: tegra: Use DIV_ROUND_CLOSEST_ULL() instead of local implementation
  pwm: Add MediaTek PWM support
  dt-bindings: pwm: Add MediaTek PWM bindings
  pwm: atmel: Enable PWM on sama5d2
  pwm: atmel: Switch to atomic PWM
  pwm: atmel-hlcdc: Implement the suspend/resume hooks
  pwm: atmel-hlcdc: Convert to the atomic PWM API

Pull IOMMU updates from Joerg Roedel:

 - code optimizations for the Intel VT-d driver

 - ability to switch off a previously enabled Intel IOMMU

 - support for 'struct iommu_device' for OMAP, Rockchip and Mediatek
   IOMMUs

 - header optimizations for IOMMU core code headers and a few fixes that
   became necessary in other parts of the kernel because of that

 - ACPI/IORT updates and fixes

 - Exynos IOMMU optimizations

 - updates for the IOMMU dma-api code to bring it closer to use per-cpu
   iova caches

 - new command-line option to set default domain type allocated by the
   iommu core code

 - another command line option to allow the Intel IOMMU switched off in
   a tboot environment

 - ARM/SMMU: TLB sync optimisations for SMMUv2, Support for using an
   IDENTITY domain in conjunction with DMA ops, Support for SMR masking,
   Support for 16-bit ASIDs (was previously broken)

 - various other small fixes and improvements

* tag 'iommu-updates-v4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (63 commits)
  soc/qbman: Move dma-mapping.h include to qman_priv.h
  soc/qbman: Fix implicit header dependency now causing build fails
  iommu: Remove trace-events include from iommu.h
  iommu: Remove pci.h include from trace/events/iommu.h
  arm: dma-mapping: Don't override dma_ops in arch_setup_dma_ops()
  ACPI/IORT: Fix CONFIG_IOMMU_API dependency
  iommu/vt-d: Don't print the failure message when booting non-kdump kernel
  iommu: Move report_iommu_fault() to iommu.c
  iommu: Include device.h in iommu.h
  x86, iommu/vt-d: Add an option to disable Intel IOMMU force on
  iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is bypassed
  iommu/arm-smmu: Correct sid to mask
  iommu/amd: Fix incorrect error handling in amd_iommu_bind_pasid()
  iommu: Make iommu_bus_notifier return NOTIFY_DONE rather than error code
  omap3isp: Remove iommu_group related code
  iommu/omap: Add iommu-group support
  iommu/omap: Make use of 'struct iommu_device'
  iommu/omap: Store iommu_dev pointer in arch_data
  iommu/omap: Move data structures to omap-iommu.h
  iommu/omap: Drop legacy-style device support
  ...

syzkaller found a way to trigger double frees from ip_mc_drop_socket()

It turns out that leave a copy of parent mc_list at accept() time,
which is very bad.

Very similar to commit 8b485ce6 ("tcp: do not inherit
fastopen_req from parent")

Initial report from Pray3r, completed by Andrey one.
Thanks a lot to them !
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Pray3r <pray3r.z@gmail.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When any of the functions contained in NGbzero.S and GENbzero.S
vector through *bzero_from_clear_user, we may end up taking a
fault when executing one of the store alternate address space
instructions. If this happens, the exception handler does not
restore the %asi register.

This commit fixes the issue by introducing a new exception
handler that ensures the %asi register is restored when
a fault is handled.

Orabug: 25577560
Signed-off-by: Dave Aldridge <david.j.aldridge@oracle.com>
Reviewed-by: Rob Gardner <rob.gardner@oracle.com>
Reviewed-by: Babu Moger <babu.moger@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use memdup_user_nul() helper instead of open-coding to simplify the code.
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pull ARC updates from Vineet Gupta:

 - AXS10x platform clk updates for I2S, PGU

 - add region based cache flush operation for ARCv2 cores

 - enforce PAE40 dependency on HIGHMEM

 - ptrace support for additional regs in ARCv2 cores

 - fix build failure in linux-next dut to a header include ordering
   change

* tag 'arc-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  Revert "ARCv2: Allow enabling PAE40 w/o HIGHMEM"
  ARC: mm: fix build failure in linux-next for UP builds
  ARCv2: ptrace: provide regset for accumulator/r30 regs
  elf: Add ARCv2 specific core note section
  ARCv2: mm: micro-optimize region flush generated code
  ARCv2: mm: Merge 2 updates to DC_CTRL for region flush
  ARCv2: mm: Implement cache region flush operations
  ARC: mm: Move full_page computation into cache version agnostic wrapper
  arc: axs10x: Fix ARC PGU default clock frequency
  arc: axs10x: Add DT bindings for I2S audio playback

Pull ARM 64-bit DT updates from Olof Johansson:
 "Device-tree updates for arm64 platforms. Just as with 32-bit, a bunch
  of smaller changes, but also some new platforms that are worth
  mentioning:

   - Rockchip RK3399 platforms for Chromebooks, including Samsung
     Chromebook Plus (Kevin)

   - Orange Pi PC2 (Allwinner H5)

   - Freescale LS2088A and LS1088A SoCs

   - Expanded support for Nvidia Tegra186 (and Jetson TX2)"

* tag 'armsoc-dt64' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (180 commits)
  arm64: dts: Add basic DT to support Spreadtrum's SP9860G
  arm64: dts: exynos: Use - instead of @ for DT OPP entries
  arm64: dts: exynos: Add support for s6e3hf2 panel device on TM2e board
  arm64: dts: juno: add information about L1 and L2 caches
  arm64: dts: juno: fix few unit address format warnings
  arm64: marvell: dts: enable the crypto engine on the Armada 8040 DB
  arm64: marvell: dts: enable the crypto engine on the Armada 7040 DB
  arm64: marvell: dts: add crypto engine description for 7k/8k
  arm64: dts: marvell: add sdhci support for Armada 7K/8K
  arm64: dts: marvell: add eMMC support for Armada 37xx
  arm64: dts: hisi: add pinctrl dtsi file for HiKey960 development board
  arm64: dts: hisi: add drive strength levels of the pins for Hi3660 SoC
  arm64: dts: hisi: enable the NIC and SAS for the hip07-d05 board
  arm64: dts: hisi: add SAS nodes for the hip07 SoC
  arm64: dts: hisi: add RoCE nodes for the hip07 SoC
  arm64: dts: hisi: add network related nodes for the hip07 SoC
  arm64: dts: hisi: add mbigen nodes for the hip07 SoC
  arm64: dts: rockchip: fix the memory size of PX5 Evaluation board
  arm64: dts: hisilicon: add dts files for hi3798cv200-poplar board
  dt-bindings: arm: hisilicon: add bindings for hi3798cv200 SoC and Poplar board
  ...

Pull ARM SoC 64-bit changes from Olof Johansson:
 "Changes to platform code for 64-bit ARM platforms.

  Most of these are small changes to the one defconfig we use on arm64
  (no per-platform configs there), to enable new drivers.

  There are also a few other changes. Broadcom sold off their 'Vulcan'
  design to Cavium, where it is now called ThunderX2. While we normally
  don't rename stuff based on marketing's whims, it seemed appropriate
  to bring in renames on a few things such as MAINTAINERS, etc"

* tag 'armsoc-arm64' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
  arm64: sunxi: always enable reset controller
  arm64: defconfig: enable the Safexcel crypto engine as a module
  arm64: configs: enable SDHCI driver for Xenon
  MAINTAINERS: Broadcom Vulcan is now Cavium ThunderX2
  arm64: defconfig: add Allwinner USB PHY
  arm64: defconfig: enable MVPP2
  arm64: defconfig: Enable video, DRM and LPASS drivers for Exynos5433 and Exynos7
  arm64: exynos: Enable Exynos PMU and PM domains drivers
  arm64: only select PINCTRL for Allwinner platforms
  arm64: set CONFIG_MMC_BCM2835=y in defconfig
  arm64: defconfig: enable I2C_PXA
  arm64: defconfig: enable MVNETA
  ARM64: defconfig: enable the leds-pwm driver and default-on trigger
  arm64: defconfig: Enable SH Mobile I2C controller

Pull ARM SoC driver updates from Olof Johansson:
 "Driver updates for ARM SoCs:

  Reset subsystem, merged through arm-soc by tradition:
   - Make bool drivers explicitly non-modular
   - New support for i.MX7 and Arria10 reset controllers

  PATA driver for Palmchip BK371 (acked by Tejun)

  Power domain drivers for i.MX (GPC, GPCv2)
   - Moved out of mach-imx for GPC
   - Bunch of tweaks, fixes, etc

  PMC support for Tegra186

  SoC detection support for Renesas RZ/G1H and RZ/G1N

  Move Tegra flow controller driver from mach directory to drivers/soc
   - (Power management / CPU power driver)

  Misc smaller tweaks for other platforms"

* tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (60 commits)
  soc: pm-domain: Fix the mangled urls
  soc: renesas: rcar-sysc: Add support for R-Car H3 ES2.0
  soc: renesas: rcar-sysc: Add support for fixing up power area tables
  soc: renesas: Register SoC device early
  soc: imx: gpc: add workaround for i.MX6QP to the GPC PD driver
  dt-bindings: imx-gpc: add i.MX6 QuadPlus compatible
  soc: imx: gpc: add defines for domain index
  soc: imx: Add GPCv2 power gating driver
  dt-bindings: Add GPCv2 power gating driver
  ARM/clk: move the ICST library to drivers/clk
  ARM: plat-versatile: remove stale clock header
  ARM: keystone: Drop PM domain support for k2g
  soc: ti: Add ti_sci_pm_domains driver
  dt-bindings: Add TI SCI PM Domains
  PM / Domains: Do not check if simple providers have phandle cells
  PM / Domains: Add generic data pointer to genpd data struct
  soc/tegra: Add initial flowctrl support for Tegra132/210
  soc/tegra: flowctrl: Add basic platform driver
  soc/tegra: Move Tegra flowctrl driver
  ARM: tegra: Remove unnecessary inclusion of flowctrl header
  ...

Pull ARM: SoC defconfig updates from Olof Johansson:
 "We've traditionally kept defconfig updates in a separate branch, often
  to encourage submaintainers to handle those patches separately to
  avoid conflicts on the shared files. The amount of changes seem to be
  decreasing though, so we might rethink how we handle this going
  forward.

  There really isn't much to write about here. The bulk of changes here
  are enabling drivers for whatever platforms the hardware is found on
  (and multi-configs)"

* tag 'armsoc-defconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (30 commits)
  multi_v7_defconfig: make Rockchip usb2-phy built-in
  ARM: omap2plus_defconfig: Enable droid 4 devices
  ARM: omap2plus_defconfig: Add QMI, ACM and PPP as loadable modules
  ARM: configs: aspeed: Add new drivers
  ARM: configs: aspeed: Update configs for BMC systems
  ARM: omap2plus_defconfig: Enable TI Ethernet PHY
  ARM: configs: Add new config fragment to change RAM start point
  ARM: configs: stm32: Add I2C support
  multi_v7_defconfig: make Rockchip DRM drivers built-in
  ARM: configs: stm32: Set CPU_V7M_NUM_IRQ to max value
  ARM: imx_v6_v7_defconfig: Select SMSC_PHY
  ARM: davinci_all_defconfig: convert to use libata PATA
  ARM: qcom_defconfig: Enable Qualcomm remoteproc and related drivers
  ARM: omap2plus_defconfig: enable ahci-dm816 module
  arm: set CONFIG_MMC_BCM2835=y in bcm2835_defconfig and multi_v7_defconfig
  ARM: bcm2835: Enable missing CMA settings for VC4 driver
  ARM: socfpga: updates for socfpga_defconfig
  ARM: imx_v6_v7_defconfig: Select hid-multitouchdriver
  ARM: imx_v6_v7_defconfig: Select max11801_ts touchscreen driver
  ARM: exynos_defconfig: Increase CONFIG_CMA_SIZE_MBYTES to 96
  ...

Pull ARM Device-tree updates from Olof Johansson:
 "Device-tree continues to see lots of updates. The majority of patches
  here are smaller changes for new hardware on existing platforms, and
  there are a few larger changes worth pointing out.

  Major new platforms:

   - Gemini has been ported to DT, so a handful of "new" platforms moved
     over from board files

   - Rockchip RK3288 support for Tinkerboard and Phytec phyCORE-RK3288
     SoM and RDK

   - A bunch of embedded platforms, several Linksys platforms, Synology
     DS116,

   - Motorola Droid4 (really old OMAP-based phone) support is added.

  Some refactorings, i.e. Allwinner H3/H5 support is commonalized.

  And lots of smaller changes, cleanups, etc. See shortlog for more
  description

  We're adding ability to cross-include DT files between arm and arm64,
  by creating appropriate links in the dt-include directory, and using
  arm/ and arm64/ as include prefixes. This will avoid other local hacks
  such as per-file links between the two arch trees (this broke for
  external mirroring of DT contents). Now they can just provide their
  own appropriate dt-include hierarcy per platform"

* tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (349 commits)
  ARM: dts: exynos: Use - instead of @ for DT OPP entries
  arm: spear6xx: add DT description of the ADC on SPEAr600
  arm: spear6xx: remove unneeded pinctrl properties in spear600-evb
  arm: spear6xx: switch spear600-evb to the new flash partition DT binding
  arm: spear6xx: fix spaces in spear600-evb.dts
  arm: spear6xx: use node labels in spear600-evb.dts
  arm: spear6xx: add labels to various nodes in spear600.dtsi
  ARM: dts: vexpress: fix few unit address format warnings
  ARM: dts: at91: sama5d3_xplained: not all ADC channels are available
  ARM: dts: at91: sama5d3_xplained: fix ADC vref
  ARM: dts: at91: add envelope detector mux to the Axentia TSE-850
  ARM: dts: armada-38x: label USB and SATA nodes
  ARM: dts: imx6q-utilite-pro: add hpd gpio
  ARM: dts: imx6qp-sabresd: Set reg_arm regulator supply
  ARM: dts: imx6qdl-sabresd: Set LDO regulator supply
  ARM: dts: imx: add Gateworks Ventana GW5903 support
  ARM: dts: i.MX25: add AIPS control registers
  ARM: dts: imx7-colibri: add Carrier Board 3.3V/5V regulators
  ARM: dts: imx7-colibri: remove 1.8V fixed regulator
  ARM: dts: imx7-colibri: allow to disable Ethernet rail
  ...

Pull ARM SoC platform updates from Olof Johansson:
 "SoC platform changes (arch/arm/mach-*). This merge window, the bulk is
  for a few platforms:

  Gemini:
   - Legacy platform that Linus Walleij has converted to multiplatform
     and DT, so a handful of various tweaks there, removal of some old
     stale support, etc.

  Atmel AT91:
   - Fixup of various power management related pieces
   - Move of SoC detection to a drivers/soc driver instead

  ST Micro STM32:
   - New SoC support: STM32H743

  TI platforms:
   - More driver support for Davinci (SATA in particular)
   - Removal of some old stale hwmod files (linkspace platform)

  Misc:
   - A couple of smaller patches for i.MX, sunxi, hisi"

* tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (57 commits)
  ARM: davinci: Add clock for CPPI 4.1 DMA engine
  ARM: mxs: add support for I2SE Duckbill 2 boards
  MAINTAINERS: Update the Allwinner sunXi entry
  ARM: i.MX25: globally disable supervisor protect
  ARM: at91: move SoC detection to its own driver
  ARM: at91: pm: correct typo
  ARM: at91: pm: Remove at91_pm_set_standby
  ARM: at91: pm: Merge all at91sam9*_pm_init
  ARM: at91: pm: Tie the USB clock mask to the pmc
  ARM: at91: pm: Tie the memory controller type to the ramc id
  ARM: at91: pm: Workaround DDRSDRC self-refresh bug with LPDDR1 memories.
  ARM: at91: pm: Simplify at91rm9200_standby
  ARM: at91: pm: Use struct at91_pm_data in pm_suspend.S
  ARM: at91: pm: Move global variables into at91_pm_data
  ARM: at91: pm: Move at91_ramc_read/write to pm.c
  ARM: at91: pm: Cleanup headers
  MAINTAINERS: Add memory drivers to AT91 entry
  MAINTAINERS: Update AT91 entry
  ARM: davinci: add pata_bk3710 libata driver support
  ARM: OMAP2+: mark omap_init_rng as __init
  ...

Pull misc ARM SoC fixes from Olof Johansson:
 "ARM SoC non-urgent fixes for merge window

  Smaller patches that didn't seem to find a home in other branches, and
  low-priority fixes from late in the merge window. A number of these
  are MAINTAINER updates, it seems.

  Highlights:

   * Maintainers:
     - Remove Alexandre Courbot and Stephen Warren from Tegra
       maintainership, add Jon Hunter
     - Remove Stephen Warren and add Stefan Wahren to bcm2835
     - Tweaks for file flagging for Marvell Dove

   * Fixes:
     - For two non-common-clk platform, handle clk_disable with NULL arg
     - Remove redundant Kconfig select for Oxnas"

* tag 'armsoc-fixes-nc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
  ARM: mmp: let clk_disable() return immediately if clk is NULL
  ARM: w90x900: let clk_disable() return immediately if clk is NULL
  MAINTAINERS: Add file patterns for dove device tree bindings
  ARM: oxnas: remove redundant select CPU_V6K
  MAINTAINERS: tegra: Remove self as maintainer
  MAINTAINERS: tegra: Replace Stephen with Jon
  MAINTAINERS: Add Stefan Wahren to bcm2835.
  MAINTAINERS: remove swarren from bcm2835
  MAINTAINERS: Add Jon Mason to BCM5301X maintainers

Pull misc vfs updates from Al Viro:
 "Assorted bits and pieces from various people. No common topic in this
  pile, sorry"

* 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  fs/affs: add rename exchange
  fs/affs: add rename2 to prepare multiple methods
  Make stat/lstat/fstatat pass AT_NO_AUTOMOUNT to vfs_statx()
  fs: don't set *REFERENCED on single use objects
  fs: compat: Remove warning from COMPATIBLE_IOCTL
  remove pointless extern of atime_need_update_rcu()
  fs: completely ignore unknown open flags
  fs: add a VALID_OPEN_FLAGS
  fs: remove _submit_bh()
  fs: constify tree_descr arrays passed to simple_fill_super()
  fs: drop duplicate header percpu-rwsem.h
  fs/affs: bugfix: Write files greater than page size on OFS
  fs/affs: bugfix: enable writes on OFS disks
  fs/affs: remove node generation check
  fs/affs: import amigaffs.h
  fs/affs: bugfix: make symbolic links work again