As more support is added for multiple VIFs, there is a need
to protect the wil6210_vif structure from access while it is
deleted (mainly from del_virtual_intf operation).
Instead of adding another mutex, use p2p_wdev_mutex and rename
it to vif_mutex to reflect the added role. Its existing roles
are similar so it extends nicely (for example it protects the
scan_request member which is also a member of wil6210_vif).
Signed-off-by: Lior David <liord@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Add support for multiple VIFs in the cfg80211 operations start_ap,
stop_ap and change_beacon. This change allows starting multiple APs
using virtual interfaces.
The data path and most other operations are still working only
on the main interface.
Signed-off-by: Lior David <liord@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Add generic support in cfg80211 operations add_virtual_intf
and del_virtual_intf for adding/removing VIFs of any
interface type, and fix change_virtual_intf to allow changing
the interface type of a VIF. Previously these operations
only worked for the P2P_DEVICE interface which is not a real
VIF(it is management-only and shares radio with the main
interface).
Currently the interface combination is validated, the VIF is
added/removed in the firmware and the appropriate net/wireless
device is also added/removed.
Added minimal support for proper interface up/down and module
unload but most operations still work only on the main interface.
Signed-off-by: Lior David <liord@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Simple infrastructure changes for supporting multiple
virtual interfaces (multiple VIFs).
It is still not possible to add new VIFs so the only VIF
belongs to the main interface.
Main changes:
1. Add MAC ID(mid) argument to wmi_send and wmi_call to
allow invoking WMI commands on different VIFs.
2. Similarly, in WMI event handler look at the mid reported
by FW and extract VIF structure (currently only for main
interface). All WMI event handlers operate on wil6210_vif
structure so they know on which VIF they were called.
3. Trivial changes to use wil6210_vif structure and MID
throughout the code.
4. Various changes to logging to report MID.

More complete multiple VIFs support will be added gradually
in next patches.
Signed-off-by: Lior David <liord@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

New FW which supports multiple virtual interfaces, reports
its allowed interface combinations using a special comment
record in the FW file. The format of the interface combinations
is similar to the kernel wiphy->iface_combinations.
When parsing FW file during module initialization, also parse
and validate the concurrency record, and initialize
wiphy->n_iface_combinations and wiphy->iface_combinations
accordingly.
Signed-off-by: Lior David <liord@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

For supporting multiple virtual interfaces in the future,
introduce a wil6210_vif structure which will hold per-VIF
data. Change the module initialization so wil6210_vif will
be part of net_device structure, and wireless_dev will be
embedded inside the wil6210_vif structure. This will allow
us to find the appropriate wil6210_vif structure when we
only have access to wireless_dev or net_device.
Signed-off-by: Lior David <liord@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

The wcn36xx_cancel_hw_scan method stops the hw scan and notify the
scan completion via ieee80211_scan_completed.
However, on scan offload cancellation, firmware sends a scan complete
indication, triggering a new call to ieee80211_scan_completed.
This leads to kernel warn since the scan has already been completed.
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Ack timing generation has to be adapted for 5/10 MHz channels.
Do it by properly initializing ack shift field in TXSIFS
register. Ack shift assumes channel width of 2.5 Mhz so
value zero means 2.5 MHz, 1 is 5 MHz and so on.
Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@neratec.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

The bitrate value for airtime calculation is specified for
full rates. We need to divide it for 5 and 10MHz channels to
get correct result.
Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@neratec.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Pointer tq is initialized with &ah->ah_txq[queue] and then a few
lines later is re-assigned the same value, hence this duplicate
assignment is redundant and can be removed.

Cleans up clang warning:
drivers/net/wireless/ath/ath5k/qcu.c:326:25: warning: Value stored
to 'tq' during its initialization is never read
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Preparation for a new QCA9377 firmware release. The new firmware release
requires more IRAM banks, hence update that on ath10k.

The IRAM banks promotion won't break any backwards compatibility, as those IRAM
banks were not getting used in previous firmware releases.
Signed-off-by: Ryan Hsu <ryanhsu@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

HIF power-on failure is applicable to each underlying
bus type. Fix log message for hif power on failure.
Signed-off-by: Govind Singh <govinds@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Trivial fix to spelling mistake in debug error message text.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Whenever ath10k firmware discards a packet (HTT_TX_COMPL_STATE_DISCARD
flag), the skb is freed and mac80211 does not get feedback through
ieee80211_tx_status().

Instead, make sure that the IEEE80211_TX_STAT_ACK flag is disabled and
let the packet go through, like ath9k does.
Signed-off-by: Ignacio Nunez Hernanz <nacho.nunez@aoifes.com>
[kvalo@codeaurora.org: rebase patch manually]
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Pull networking fixes from David Miller:

 1) Fix TTL offset calculation in mac80211 mesh code, from Peter Oh.

 2) Fix races with procfs in ipt_CLUSTERIP, from Cong Wang.

 3) Memory leak fix in lpm_trie BPF map code, from Yonghong Song.

 4) Need to use GFP_ATOMIC in BPF cpumap allocations, from Jason Wang.

 5) Fix potential deadlocks in netfilter getsockopt() code paths, from
    Paolo Abeni.

 6) Netfilter stackpointer size checks really are needed to validate
    user input, from Florian Westphal.

 7) Missing timer init in x_tables, from Paolo Abeni.

 8) Don't use WQ_MEM_RECLAIM in mac80211 hwsim, from Johannes Berg.

 9) When an ibmvnic device is brought down then back up again, it can be
    sent queue entries from a previous session, handle this properly
    instead of crashing. From Thomas Falcon.

10) Fix TCP checksum on LRO buffers in mlx5e, from Gal Pressman.

11) When we are dumping filters in cls_api, the output SKB is empty, and
    the filter we are dumping is too large for the space in the SKB, we
    should return -EMSGSIZE like other netlink dump operations do.
    Otherwise userland has no signal that is needs to increase the size
    of its read buffer. From Roman Kapl.

12) Several XDP fixes for virtio_net, from Jesper Dangaard Brouer.

13) Module refcount leak in netlink when a dump start fails, from Jason
    Donenfeld.

14) Handle sub-optimal GSO sizes better in TCP BBR congestion control,
    from Eric Dumazet.

15) Releasing bpf per-cpu arraymaps can take a long time, add a
    condtional scheduling point. From Eric Dumazet.

16) Implement retpolines for tail calls in x64 and arm64 bpf JITs. From
    Daniel Borkmann.

17) Fix page leak in gianfar driver, from Andy Spencer.

18) Missed clearing of estimator scratch buffer, from Eric Dumazet.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (76 commits)
  net_sched: gen_estimator: fix broken estimators based on percpu stats
  gianfar: simplify FCS handling and fix memory leak
  ipv6 sit: work around bogus gcc-8 -Wrestrict warning
  macvlan: fix use-after-free in macvlan_common_newlink()
  bpf, arm64: fix out of bounds access in tail call
  bpf, x64: implement retpoline for tail call
  rxrpc: Fix send in rxrpc_send_data_packet()
  net: aquantia: Fix error handling in aq_pci_probe()
  bpf: fix rcu lockdep warning for lpm_trie map_free callback
  bpf: add schedule points in percpu arrays management
  regulatory: add NUL to request alpha2
  ibmvnic: Fix early release of login buffer
  net/smc9194: Remove bogus CONFIG_MAC reference
  net: ipv4: Set addr_type in hash_keys for forwarded case
  tcp_bbr: better deal with suboptimal GSO
  smsc75xx: fix smsc75xx_set_features()
  netlink: put module reference if dump start fails
  selftests/bpf/test_maps: exit child process without error in ENOMEM case
  selftests/bpf: update gitignore with test_libbpf_open
  selftests/bpf: tcpbpf_kern: use in6_* macros from glibc
  ..

Merge branch 'fixes-v4.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull security subsystem fixes from James Morris:

 - keys fixes via David Howells:
      "A collection of fixes for Linux keyrings, mostly thanks to Eric
       Biggers:

        - Fix some PKCS#7 verification issues.

        - Fix handling of unsupported crypto in X.509.

        - Fix too-large allocation in big_key"

 - Seccomp updates via Kees Cook:
      "These are fixes for the get_metadata interface that landed during
       -rc1. While the new selftest is strictly not a bug fix, I think
       it's in the same spirit of avoiding bugs"

 - an IMA build fix from Randy Dunlap

* 'fixes-v4.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
  integrity/security: fix digsig.c build error with header file
  KEYS: Use individual pages in big_key for crypto buffers
  X.509: fix NULL dereference when restricting key with unsupported_sig
  X.509: fix BUG_ON() when hash algorithm is unsupported
  PKCS#7: fix direct verification of SignerInfo signature
  PKCS#7: fix certificate blacklisting
  PKCS#7: fix certificate chain verification
  seccomp: add a selftest for get_metadata
  ptrace, seccomp: tweak get_metadata behavior slightly
  seccomp, ptrace: switch get_metadata types to arch independent

Pull arm64 fixes from Catalin Marinas:
 "arm64 and perf fixes:

   - build error when accessing MPIDR_HWID_BITMASK from .S

   - fix CTR_EL0 field definitions

   - remove/disable some kernel messages on user faults (unhandled
     signals, unimplemented syscalls)

   - fix kernel page fault in unwind_frame() with function graph tracing

   - fix perf sleeping while atomic errors when booting with ACPI"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: fix unwind_frame() for filtered out fn for function graph tracing
  arm64: Enforce BBM for huge IO/VMAP mappings
  arm64: perf: correct PMUVer probing
  arm_pmu: acpi: request IRQs up-front
  arm_pmu: note IRQs and PMUs per-cpu
  arm_pmu: explicitly enable/disable SPIs at hotplug
  arm_pmu: acpi: check for mismatched PPIs
  arm_pmu: add armpmu_alloc_atomic()
  arm_pmu: fold platform helpers into platform code
  arm_pmu: kill arm_pmu_platdata
  ARM: ux500: remove PMU IRQ bouncer
  arm64: __show_regs: Only resolve kernel symbols when running at EL1
  arm64: Remove unimplemented syscall log message
  arm64: Disable unhandled signal log messages by default
  arm64: cpufeature: Fix CTR_EL0 field definitions
  arm64: uaccess: Formalise types for access_ok()
  arm64: Fix compilation error while accessing MPIDR_HWID_BITMASK from .S files

Pull MIPS fix from James Hogan:
 "A single MIPS fix for mismatching struct compat_flock, resulting in
  bus errors starting Firefox on Debian 8 since 4.13"

* tag 'mips_fixes_4.16_3' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/mips:
  MIPS: Drop spurious __unused in struct compat_flock

Pull printk fixlet from Petr Mladek:
 "People expect to see the real pointer value for %px.

  Let's substitute '(null)' only for the other %p? format modifiers that
  need to deference the pointer"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk:
  vsprintf: avoid misleading "(null)" for %px

Pull i2c fixes from Wolfram Sang:
 "Two bugfixes, one v4.16 regression fix, and two documentation fixes"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: designware: Consider SCL GPIO optional
  i2c: busses: i2c-sirf: Fix spelling: "formular" -> "formula".
  i2c: bcm2835: Set up the rising/falling edge delays
  i2c: i801: Add missing documentation entries for Braswell and Kaby Lake
  i2c: designware: must wait for enable

Pull SCSI fixes from James Bottomley:
 "These are mostly fixes for problems with merge window code.

  In addition we have one doc update (alua) and two dead code removals
  (aiclib and octogon) a spurious assignment removal (csiostor) and a
  performance improvement for storvsc involving better interrupt
  spreading and increasing the command per lun handling"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: qla4xxx: skip error recovery in case of register disconnect.
  scsi: aacraid: fix shutdown crash when init fails
  scsi: qedi: Cleanup local str variable
  scsi: qedi: Fix truncation of CHAP name and secret
  scsi: qla2xxx: Fix incorrect handle for abort IOCB
  scsi: qla2xxx: Fix double free bug after firmware timeout
  scsi: storvsc: Increase cmd_per_lun for higher speed devices
  scsi: qla2xxx: Fix a locking imbalance in qlt_24xx_handle_els()
  scsi: scsi_dh: Document alua_rtpg_queue() arguments
  scsi: Remove Makefile entry for oktagon files
  scsi: aic7xxx: remove aiclib.c
  scsi: qla2xxx: Avoid triggering undefined behavior in qla2x00_mbx_completion()
  scsi: mptfusion: Add bounds check in mptctl_hp_targetinfo()
  scsi: sym53c8xx_2: iterator underflow in sym_getsync()
  scsi: bnx2fc: Fix check in SCSI completion handler for timed out request
  scsi: csiostor: remove redundant assignment to pointer 'ln'
  scsi: ufs: Enable quirk to ignore sending WRITE_SAME command
  scsi: ibmvfc: fix misdefined reserved field in ibmvfc_fcp_rsp_info
  scsi: qla2xxx: Fix memory corruption during hba reset test
  scsi: mpt3sas: fix an out of bound write

For ages iproute2 has used `struct rtmsg` as the ancillary header for
FIB rules and in the process set the protocol value to RTPROT_BOOT.
Until ca56209a66 ("net: Allow a rule to track originating protocol")
the kernel rules code ignored the protocol value sent from userspace
and always returned 0 in notifications. To avoid incompatibility with
existing iproute2, send the protocol as a new attribute.

Fixes: cac56209 ("net: Allow a rule to track originating protocol")
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pull drm fixes from Dave Airlie:
 "A bunch of fixes for rc3:

  Exynos:
   - fixes for using monotonic timestamps
   - register definitions
   - removal of unused file

  ipu-v3L
   - minor changes
   - make some register arrays const+static
   - fix some leaks

  meson:
   - fix for vsync

  atomic:
   - fix for memory leak

  EDID parser:
   - add quirks for some more non-desktop devices
   - 6-bit panel fix.

  drm_mm:
   - fix a bug in the core drm mm hole handling

  cirrus:
   - fix lut loading regression

  Lastly there is a deadlock fix around runtime suspend for secondary
  GPUs.

  There was a deadlock between one thread trying to wait for a workqueue
  job to finish in the runtime suspend path, and the workqueue job it
  was waiting for in turn waiting for a runtime_get_sync to return.

  The fixes avoids it by not doing the runtime sync in the workqueue as
  then we always wait for all those tasks to complete before we runtime
  suspend"

* tag 'drm-fixes-for-v4.16-rc3' of git://people.freedesktop.org/~airlied/linux: (25 commits)
  drm/tve200: fix kernel-doc documentation comment include
  drm/edid: quirk Sony PlayStation VR headset as non-desktop
  drm/edid: quirk Windows Mixed Reality headsets as non-desktop
  drm/edid: quirk Oculus Rift headsets as non-desktop
  drm/meson: fix vsync buffer update
  drm: Handle unexpected holes in color-eviction
  drm: exynos: Use proper macro definition for HDMI_I2S_PIN_SEL_1
  drm/exynos: remove exynos_drm_rotator.h
  drm/exynos: g2d: Delete an error message for a failed memory allocation in two functions
  drm/exynos: fix comparison to bitshift when dealing with a mask
  drm/exynos: g2d: use monotonic timestamps
  drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA
  gpu: ipu-csi: add 10/12-bit grayscale support to mbus_code_to_bus_cfg
  gpu: ipu-cpmem: add 16-bit grayscale support to ipu_cpmem_set_image
  gpu: ipu-v3: prg: fix device node leak in ipu_prg_lookup_by_phandle
  gpu: ipu-v3: pre: fix device node leak in ipu_pre_lookup_by_phandle
  drm/amdgpu: Fix deadlock on runtime suspend
  drm/radeon: Fix deadlock on runtime suspend
  drm/nouveau: Fix deadlock on runtime suspend
  drm: Allow determining if current task is output poll worker
  ...

The packet fanout test generates UDP traffic and reads this with
a pair of packet sockets, testing the various fanout algorithms.

Avoid non-determinism from reading unrelated background traffic.
Fanout decisions are made before unrelated packets can be dropped with
a filter, so that is an insufficient strategy [*]. Run the packet
socket tests in a network namespace, similar to msg_zerocopy.

It it still good practice to install a filter on a packet socket
before accepting traffic. Because this is example code, demonstrate
that pattern. Open the socket initially bound to no protocol, install
a filter, and only then bind to ETH_P_IP.

Another source of non-determinism is hash collisions in FANOUT_HASH.
The hash function used to select a socket in the fanout group includes
the pseudorandom number hashrnd, which is not visible from userspace.
To work around this, the test tries to find a pair of UDP source ports
that do not collide. It gives up too soon (5 times, every 32 runs) and
output is confusing. Increase tries to 20 and revise the error msg.

[*] another approach would be to add a third socket to the fanout
    group and direct all unexpected traffic here. This is possible
    only when reimplementing methods like RR or HASH alongside this
    extra catch-all bucket, using the BPF fanout method.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Zero is being bit-wise or'd in a calculation twice; these are redundant
and can be removed.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

pfifo_fast got percpu stats lately, uncovering a bug I introduced last
year in linux-4.10.

I missed the fact that we have to clear our temporary storage
before calling __gnet_stats_copy_basic() in the case of percpu stats.

Without this fix, rate estimators (tc qd replace dev xxx root est 1sec
4sec pfifo_fast) are utterly broken.

Fixes: 1c0d32fd ("net_sched: gen_estimator: complete rewrite of rate estimators")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Alexei Starovoitov says:

====================
pull-request: bpf 2018-02-22

The following pull-request contains BPF updates for your *net* tree.

The main changes are:

1) two urgent fixes for bpf_tail_call logic for x64 and arm64 JITs, from Daniel.

2) cond_resched points in percpu array alloc/free paths, from Eric.

3) lockdep and other minor fixes, from Yonghong, Arnd, Anders, Li.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

if either or both of MSG_ZEROCOPY and SOCK_ZEROCOPY have not been
specified, the rm->data.op_mmp_znotifier allocation will be skipped.
In this case, it is invalid ot pass down a cmsghdr with
RDS_CMSG_ZCOPY_COOKIE, so return EINVAL from rds_msg_zcopy for this
case.

Reported-by: syzbot+f893ae7bb2f6456dfbc3@syzkaller.appspotmail.com
Fixes: 0cebacce ("rds: zerocopy Tx support.")
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

r8168_check_dash() returns false anyway for all chip versions not
supporting dash. So we can simplify the check conditions.

In addition change the check functions to return bool instead of int,
because they actually return a bool value.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Currently, if BIOS enables WOL in the chip, settings are inconsistent
because the device isn't marked as wakeup-enabled (if not done
explicitly via userspace tools). This causes issues with suspend/
resume because mdio_bus_phy_may_suspend() checks whether device is
wakeup-enabled. In detail MDIO bus access in phy_suspend() can fail
because the MDIO bus is disabled.

In the history of the driver we find two competing approaches:
8f9d5138 "r8169: remember WOL preferences on driver load" prefers
to preserve what the BIOS may have set, whilst bde135a6
"r8169: only enable PCI wakeups when WOL is active" disabled PCI
wakeup per default to work around a bug on one platform.

Seems like nobody complained after the latter patch about non-working
WOL, what makes me think that nobody uses WOL w/o configuring it
explicitly.

My opinion:
Vast majority of users doesn't use WOL even if the BIOS enables it in
the chip. And having WOL being active keeps the PHY(s) from powering
down if being idle.
If somebody needs WOL, he can enable it during boot, e.g. by
configuring systemd.link/WakeOnLan.

Therefore, to make WOL consistent again, disable it per default.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Previously, buffer descriptors containing only the frame check sequence
(FCS) were skipped and not added to the skb. However, the page reference
count was still incremented, leading to a memory leak.

Fixing this inside gfar_add_rx_frag() is difficult due to reserved
memory handling and page reuse. Instead, move the FCS handling to
gfar_process_frame() and trim off the FCS before passing the skb up the
networking stack.
Signed-off-by: Andy Spencer <aspencer@spacex.com>
Signed-off-by: Jim Gruen <jgruen@spacex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

gcc-8 has a new warning that detects overlapping input and output arguments
in memcpy(). It triggers for sit_init_net() calling ipip6_tunnel_clone_6rd(),
which is actually correct:

net/ipv6/sit.c: In function 'sit_init_net':
net/ipv6/sit.c:192:3: error: 'memcpy' source argument is the same as destination [-Werror=restrict]

The problem here is that the logic detecting the memcpy() arguments finds them
to be the same, but the conditional that tests for the input and output of
ipip6_tunnel_clone_6rd() to be identical is not a compile-time constant.

We know that netdev_priv(t->dev) is the same as t for a tunnel device,
and comparing "dev" directly here lets the compiler figure out as well
that 'dev == sitn->fb_tunnel_dev' when called from sit_init_net(), so
it no longer warns.

This code is old, so Cc stable to make sure that we don't get the warning
for older kernels built with new gcc.

Cc: Martin Sebor <msebor@gmail.com>
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83456Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

The following use-after-free was reported by KASan when running
LTP macvtap01 test on 4.16-rc2:

[10642.528443] BUG: KASAN: use-after-free in
               macvlan_common_newlink+0x12ef/0x14a0 [macvlan]
[10642.626607] Read of size 8 at addr ffff880ba49f2100 by task ip/18450
...
[10642.963873] Call Trace:
[10642.994352]  dump_stack+0x5c/0x7c
[10643.035325]  print_address_description+0x75/0x290
[10643.092938]  kasan_report+0x28d/0x390
[10643.137971]  ? macvlan_common_newlink+0x12ef/0x14a0 [macvlan]
[10643.207963]  macvlan_common_newlink+0x12ef/0x14a0 [macvlan]
[10643.275978]  macvtap_newlink+0x171/0x260 [macvtap]
[10643.334532]  rtnl_newlink+0xd4f/0x1300
...
[10646.256176] Allocated by task 18450:
[10646.299964]  kasan_kmalloc+0xa6/0xd0
[10646.343746]  kmem_cache_alloc_trace+0xf1/0x210
[10646.397826]  macvlan_common_newlink+0x6de/0x14a0 [macvlan]
[10646.464386]  macvtap_newlink+0x171/0x260 [macvtap]
[10646.522728]  rtnl_newlink+0xd4f/0x1300
...
[10647.022028] Freed by task 18450:
[10647.061549]  __kasan_slab_free+0x138/0x180
[10647.111468]  kfree+0x9e/0x1c0
[10647.147869]  macvlan_port_destroy+0x3db/0x650 [macvlan]
[10647.211411]  rollback_registered_many+0x5b9/0xb10
[10647.268715]  rollback_registered+0xd9/0x190
[10647.319675]  register_netdevice+0x8eb/0xc70
[10647.370635]  macvlan_common_newlink+0xe58/0x14a0 [macvlan]
[10647.437195]  macvtap_newlink+0x171/0x260 [macvtap]

Commit d02fd6e7 ("macvlan: Fix one possible double free") handles
the case when register_netdevice() invokes ndo_uninit() on error and
as a result free the port. But 'macvlan_port_get_rtnl(dev))' check
(returns dev->rx_handler_data), which was added by this commit in order
to prevent double free, is not quite correct:

* for macvlan it always returns NULL because 'lowerdev' is the one that
  was used to register rx handler (port) in macvlan_port_create() as
  well as to unregister it in macvlan_port_destroy().
* for macvtap it always returns a valid pointer because macvtap registers
  its own rx handler before macvlan_common_newlink().

Fixes: d02fd6e7 ("macvlan: Fix one possible double free")
Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

do_task_stat() calls get_wchan(), which further does unwind_frame().
unwind_frame() restores frame->pc to original value in case function
graph tracer has modified a return address (LR) in a stack frame to hook
a function return. However, if function graph tracer has hit a filtered
function, then we can't unwind it as ftrace_push_return_trace() has
biased the index(frame->graph) with a 'huge negative'
offset(-FTRACE_NOTRACE_DEPTH).

Moreover, arm64 stack walker defines index(frame->graph) as unsigned
int, which can not compare a -ve number.

Similar problem we can have with calling of walk_stackframe() from
save_stack_trace_tsk() or dump_backtrace().

This patch fixes unwind_frame() to test the index for -ve value and
restore index accordingly before we can restore frame->pc.

Reproducer:

cd /sys/kernel/debug/tracing/
echo schedule > set_graph_notrace
echo 1 > options/display-graph
echo wakeup > current_tracer
ps -ef | grep -i agent

Above commands result in:
Unable to handle kernel paging request at virtual address ffff801bd3d1e000
pgd = ffff8003cbe97c00
[ffff801bd3d1e000] *pgd=0000000000000000, *pud=0000000000000000
Internal error: Oops: 96000006 [#1] SMP
[...]
CPU: 5 PID: 11696 Comm: ps Not tainted 4.11.0+ #33
[...]
task: ffff8003c21ba000 task.stack: ffff8003cc6c0000
PC is at unwind_frame+0x12c/0x180
LR is at get_wchan+0xd4/0x134
pc : [<ffff00000808892c>] lr : [<ffff0000080860b8>] pstate: 60000145
sp : ffff8003cc6c3ab0
x29: ffff8003cc6c3ab0 x28: 0000000000000001
x27: 0000000000000026 x26: 0000000000000026
x25: 00000000000012d8 x24: 0000000000000000
x23: ffff8003c1c04000 x22: ffff000008c83000
x21: ffff8003c1c00000 x20: 000000000000000f
x19: ffff8003c1bc0000 x18: 0000fffffc593690
x17: 0000000000000000 x16: 0000000000000001
x15: 0000b855670e2b60 x14: 0003e97f22cf1d0f
x13: 0000000000000001 x12: 0000000000000000
x11: 00000000e8f4883e x10: 0000000154f47ec8
x9 : 0000000070f367c0 x8 : 0000000000000000
x7 : 00008003f7290000 x6 : 0000000000000018
x5 : 0000000000000000 x4 : ffff8003c1c03cb0
x3 : ffff8003c1c03ca0 x2 : 00000017ffe80000
x1 : ffff8003cc6c3af8 x0 : ffff8003d3e9e000

Process ps (pid: 11696, stack limit = 0xffff8003cc6c0000)
Stack: (0xffff8003cc6c3ab0 to 0xffff8003cc6c4000)
[...]
[<ffff00000808892c>] unwind_frame+0x12c/0x180
[<ffff000008305008>] do_task_stat+0x864/0x870
[<ffff000008305c44>] proc_tgid_stat+0x3c/0x48
[<ffff0000082fde0c>] proc_single_show+0x5c/0xb8
[<ffff0000082b27e0>] seq_read+0x160/0x414
[<ffff000008289e6c>] __vfs_read+0x58/0x164
[<ffff00000828b164>] vfs_read+0x88/0x144
[<ffff00000828c2e8>] SyS_read+0x60/0xc0
[<ffff0000080834a0>] __sys_trace_return+0x0/0x4

Fixes: 20380bb3 (arm64: ftrace: fix a stack tracer's output under function graph tracer)
Signed-off-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
[catalin.marinas@arm.com: replace WARN_ON with WARN_ON_ONCE]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

security/integrity/digsig.c has build errors on some $ARCH due to a
missing header file, so add it.

  security/integrity/digsig.c:146:2: error: implicit declaration of function 'vfree' [-Werror=implicit-function-declaration]
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: linux-integrity@vger.kernel.org
Link: http://kisskb.ellerman.id.au/kisskb/head/13396/Signed-off-by: James Morris <james.morris@microsoft.com>

Merge tag 'keys-fixes-20180222-2' of https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs into fixes-v4.16-rc3

Keyrings fixes.

drm/imx: ipu-v3 fixups and grayscale support

- Make const interrupt register arrays static, reduces object size.
- Fix device_node leaks in PRE/PRG phandle lookup functions.
- Add 8-bit and 16-bit grayscale buffer support to ipu_cpmem_set_image,
- add 10-bit and 12-bit grayscale media bus support to ipu-csi,
  to be used by the imx-media driver.

* tag 'imx-drm-next-2018-02-22' of git://git.pengutronix.de/git/pza/linux:
  gpu: ipu-csi: add 10/12-bit grayscale support to mbus_code_to_bus_cfg
  gpu: ipu-cpmem: add 16-bit grayscale support to ipu_cpmem_set_image
  gpu: ipu-v3: prg: fix device node leak in ipu_prg_lookup_by_phandle
  gpu: ipu-v3: pre: fix device node leak in ipu_pre_lookup_by_phandle
  gpu: ipu-cpmem: add 8-bit grayscale support to ipu_cpmem_set_image
  gpu: ipu-v3: make const arrays int_reg static, shrinks object size

The MIPS %.its.S compiler command did not define __ASSEMBLY__, which meant
when compiler_types.h was added to kconfig.h, unexpected things appeared
(e.g. struct declarations) which should not have been present. As done in
the general %.S compiler command, __ASSEMBLY__ is now included here too.

The failure was:

    Error: arch/mips/boot/vmlinux.gz.its:201.1-2 syntax error
    FATAL ERROR: Unable to parse input tree
    /usr/bin/mkimage: Can't read arch/mips/boot/vmlinux.gz.itb.tmp: Invalid argument
    /usr/bin/mkimage Can't add hashes to FIT blob
Reported-by: kbuild test robot <lkp@intel.com>
Fixes: 28128c61 ("kconfig.h: Include compiler types to avoid missed struct attributes")
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

Pull siginfo fix from Eric Biederman:
 "This fixes a build error that only shows up on blackfin"

* 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  fs/signalfd: fix build error for BUS_MCEERR_AR