As stated in the original commit for pidfd_send_signal() we don't allow
to signal processes through O_PATH file descriptors since it is
semantically equivalent to a write on the pidfd.

We already correctly error out right now and return EBADF if an O_PATH
fd is passed.  This is because we use file->f_op to detect whether a
pidfd is passed and O_PATH fds have their file->f_op set to empty_fops
in do_dentry_open() and thus fail the test.

Thus, there is no regression.  It's just semantically correct to use
fdget() and return an error right from there instead of taking a
reference and returning an error later.
Signed-off-by: Christian Brauner <christian@brauner.io>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jann Horn <jann@thejh.net>
Cc: David Howells <dhowells@redhat.com>
Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
Cc: Andy Lutomirsky <luto@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Aleksa Sarai <cyphar@cyphar.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull s390 bug fixes from Martin Schwidefsky:

 - Fix overwrite of the initial ramdisk due to misuse of IS_ENABLED

 - Fix integer overflow in the dasd driver resulting in incorrect number
   of blocks for large devices

 - Fix a lockdep false positive in the 3270 driver

 - Fix a deadlock in the zcrypt driver

 - Fix incorrect debug feature entries in the pkey api

 - Fix inline assembly constraints fallout with CONFIG_KASAN=y

* tag 's390-5.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390: correct some inline assembly constraints
  s390/pkey: add one more argument space for debug feature entry
  s390/zcrypt: fix possible deadlock situation on ap queue remove
  s390/3270: fix lockdep false positive on view->lock
  s390/dasd: Fix capacity calculation for large volumes
  s390/mem_detect: Use IS_ENABLED(CONFIG_BLK_DEV_INITRD)

Pull AFS fixes from David Howells:

 - Stop using the deprecated get_seconds().

 - Don't make tracepoint strings const as the section they go in isn't
   read-only.

 - Differentiate failure due to unmarshalling from other failure cases.
   We shouldn't abort with RXGEN_CC/SS_UNMARSHAL if it's not due to
   unmarshalling.

 - Add a missing unlock_page().

 - Fix the interaction between receiving a notification from a server
   that it has invalidated all outstanding callback promises and a
   client call that we're in the middle of making that will get a new
   promise.

* tag 'afs-fixes-20190413' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  afs: Fix in-progess ops to ignore server-level callback invalidation
  afs: Unlock pages for __pagevec_release()
  afs: Differentiate abort due to unmarshalling from other errors
  afs: Avoid section confusion in CM_NAME
  afs: avoid deprecated get_seconds()

Pull crypto fix from Herbert Xu:
 "Fix a bug in the implementation of the x86 accelerated version of
  poly1305"

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: x86/poly1305 - fix overflow during partial reduction

Pull drm fixes from Dave Airlie:
 "Since Easter is looming for me, I'm just pushing whatever is in my
  tree, I'll see what else turns up and maybe I'll send another pull
  early next week if there is anything.

  tegra:
   - stream id programming fix
   - avoid divide by 0 for bad hdmi audio setup code

  ttm:
   - Hugepages fix
   - refcount imbalance in error path fix

  amdgpu:
   - GPU VM fixes for Vega/RV
   - DC AUX fix for active DP-DVI dongles
   - DC fix for multihead regression"

* tag 'drm-fixes-2019-04-18' of git://anongit.freedesktop.org/drm/drm:
  drm/tegra: hdmi: Setup audio only if configured
  drm/amd/display: If one stream full updates, full update all planes
  drm/amdgpu/gmc9: fix VM_L2_CNTL3 programming
  drm/amdgpu: shadow in shadow_list without tbo.mem.start cause page fault in sriov TDR
  gpu: host1x: Program stream ID to bypass without SMMU
  drm/amd/display: extending AUX SW Timeout
  drm/ttm: fix dma_fence refcount imbalance on error path
  drm/ttm: fix incrementing the page pointer for huge pages
  drm/ttm: fix start page for huge page check in ttm_put_pages()
  drm/ttm: fix out-of-bounds read in ttm_put_pages() v2

- GPUVM fixes for vega/RV and shadow buffers
- TTM fixes for hugepages
- TTM fix for refcount imbalance in error path
- DC AUX fix for some active DP-DVI dongles
- DC fix for multihead VT switch regression
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Alex Deucher <alexdeucher@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190415051703.3377-1-alexander.deucher@amd.com

drm/tegra: Fixes for v5.1-rc6

This contains a follow-up fix for the stream ID programming and a fix
for a regression on older Tegra devices (Tegra20 and Tegra30) that are
running into a division by zero trying to enable audio over HDMI.
Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Thierry Reding <thierry.reding@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190417073525.21680-1-thierry.reding@gmail.com

Pull smb3 fixes from Steve French:
 "Five small SMB3 fixes, all also for stable - an important fix for an
  oplock (lease) bug, a handle leak, and three bugs spotted by KASAN"

* tag '5.1-rc5-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  CIFS: keep FileInfo handle live during oplock break
  cifs: fix handle leak in smb2_query_symlink()
  cifs: Fix lease buffer length error
  cifs: Fix use-after-free in SMB2_read
  cifs: Fix use-after-free in SMB2_write

Pull IPMI fixes from Corey Minyard:
 "Fixes for some bugs cause by recent changes. One crash if you feed bad
  data to the module parameters, one BUG that sometimes occurs when a
  user closes the connection, and one bug that cause the driver to not
  work if the configuration information only comes in from SMBIOS"

* tag 'for-linus-5.1-2' of git://github.com/cminyard/linux-ipmi:
  ipmi: fix sleep-in-atomic in free_user at cleanup SRCU user->release_barrier
  ipmi: ipmi_si_hardcode.c: init si_type array to fix a crash
  ipmi: Fix failure on SMBIOS specified devices

Pull networking fixes from David Miller:

 1) Handle init flow failures properly in iwlwifi driver, from Shahar S
    Matityahu.

 2) mac80211 TXQs need to be unscheduled on powersave start, from Felix
    Fietkau.

 3) SKB memory accounting fix in A-MDSU aggregation, from Felix Fietkau.

 4) Increase RCU lock hold time in mlx5 FPGA code, from Saeed Mahameed.

 5) Avoid checksum complete with XDP in mlx5, also from Saeed.

 6) Fix netdev feature clobbering in ibmvnic driver, from Thomas Falcon.

 7) Partial sent TLS record leak fix from Jakub Kicinski.

 8) Reject zero size iova range in vhost, from Jason Wang.

 9) Allow pending work to complete before clcsock release from Karsten
    Graul.

10) Fix XDP handling max MTU in thunderx, from Matteo Croce.

11) A lot of protocols look at the sa_family field of a sockaddr before
    validating it's length is large enough, from Tetsuo Handa.

12) Don't write to free'd pointer in qede ptp error path, from Colin Ian
    King.

13) Have to recompile IP options in ipv4_link_failure because it can be
    invoked from ARP, from Stephen Suryaputra.

14) Doorbell handling fixes in qed from Denis Bolotin.

15) Revert net-sysfs kobject register leak fix, it causes new problems.
    From Wang Hai.

16) Spectre v1 fix in ATM code, from Gustavo A. R. Silva.

17) Fix put of BROPT_VLAN_STATS_PER_PORT in bridging code, from Nikolay
    Aleksandrov.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (111 commits)
  socket: fix compat SO_RCVTIMEO_NEW/SO_SNDTIMEO_NEW
  tcp: tcp_grow_window() needs to respect tcp_space()
  ocelot: Clean up stats update deferred work
  ocelot: Don't sleep in atomic context (irqs_disabled())
  net: bridge: fix netlink export of vlan_stats_per_port option
  qed: fix spelling mistake "faspath" -> "fastpath"
  tipc: set sysctl_tipc_rmem and named_timeout right range
  tipc: fix link established but not in session
  net: Fix missing meta data in skb with vlan packet
  net: atm: Fix potential Spectre v1 vulnerabilities
  net/core: work around section mismatch warning for ptp_classifier
  net: bridge: fix per-port af_packet sockets
  bnx2x: fix spelling mistake "dicline" -> "decline"
  route: Avoid crash from dereferencing NULL rt->from
  MAINTAINERS: normalize Woojung Huh's email address
  bonding: fix event handling for stacked bonds
  Revert "net-sysfs: Fix memory leak in netdev_register_kobject"
  rtnetlink: fix rtnl_valid_stats_req() nlmsg_len check
  qed: Fix the DORQ's attentions handling
  qed: Fix missing DORQ attentions
  ...

free_user() could be called in atomic context.

This patch pushed the free operation off into a workqueue.

Example:

 BUG: sleeping function called from invalid context at kernel/workqueue.c:2856
 in_atomic(): 1, irqs_disabled(): 0, pid: 177, name: ksoftirqd/27
 CPU: 27 PID: 177 Comm: ksoftirqd/27 Not tainted 4.19.25-3 #1
 Hardware name: AIC 1S-HV26-08/MB-DPSB04-06, BIOS IVYBV060 10/21/2015
 Call Trace:
  dump_stack+0x5c/0x7b
  ___might_sleep+0xec/0x110
  __flush_work+0x48/0x1f0
  ? try_to_del_timer_sync+0x4d/0x80
  _cleanup_srcu_struct+0x104/0x140
  free_user+0x18/0x30 [ipmi_msghandler]
  ipmi_free_recv_msg+0x3a/0x50 [ipmi_msghandler]
  deliver_response+0xbd/0xd0 [ipmi_msghandler]
  deliver_local_response+0xe/0x30 [ipmi_msghandler]
  handle_one_recv_msg+0x163/0xc80 [ipmi_msghandler]
  ? dequeue_entity+0xa0/0x960
  handle_new_recv_msgs+0x15c/0x1f0 [ipmi_msghandler]
  tasklet_action_common.isra.22+0x103/0x120
  __do_softirq+0xf8/0x2d7
  run_ksoftirqd+0x26/0x50
  smpboot_thread_fn+0x11d/0x1e0
  kthread+0x103/0x140
  ? sort_range+0x20/0x20
  ? kthread_destroy_worker+0x40/0x40
  ret_from_fork+0x1f/0x40

Fixes: 77f82696 ("ipmi: fix use-after-free of user->release_barrier.rda")
Reported-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: stable@vger.kernel.org # 5.0
Cc: Yang Yingliang <yangyingliang@huawei.com>

Inline assembly code changed in this patch should really use "Q"
constraint "Memory reference without index register and with short
displacement". The kernel build with kasan instrumentation enabled
might occasionally break otherwise (due to stack instrumentation).
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

The audio configuration is only valid if the HDMI codec has been
properly set up. Do not attempt to set up audio before that happens
because it causes a division by zero.

Note that this is only problematic on Tegra20 and Tegra30. Later chips
implement the division instructions which return zero when dividing by
zero and don't throw an exception.

Fixes: db5adf4d ("drm/tegra: hdmi: Fix audio to work with any pixel clock rate")
Reported-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

It looks like the new socket options only work correctly
for native execution, but in case of compat mode fall back
to the old behavior as we ignore the 'old_timeval' flag.

Rework so we treat SO_RCVTIMEO_NEW/SO_SNDTIMEO_NEW the
same way in compat and native 32-bit mode.

Cc: Deepa Dinamani <deepa.kernel@gmail.com>
Fixes: a9beb86a ("sock: Add SO_RCVTIMEO_NEW and SO_SNDTIMEO_NEW")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Deepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

For some reason, tcp_grow_window() correctly tests if enough room
is present before attempting to increase tp->rcv_ssthresh,
but does not prevent it to grow past tcp_space()

This is causing hard to debug issues, like failing
the (__tcp_select_window(sk) >= tp->rcv_wnd) test
in __tcp_ack_snd_check(), causing ACK delays and possibly
slow flows.

Depending on tcp_rmem[2], MTU, skb->len/skb->truesize ratio,
we can see the problem happening on "netperf -t TCP_RR -- -r 2000,2000"
after about 60 round trips, when the active side no longer sends
immediate acks.

This bug predates git history.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Wei Wang <weiwan@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This is preventive cleanup that may save troubles later.
No need to cancel repeateadly queued work if code is properly
refactored.
Don't let the ethtool -s process interfere with the stat workqueue
scheduling.
Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Preemption disabled at:
 [<ffff000008cabd54>] dev_set_rx_mode+0x1c/0x38
 Call trace:
 [<ffff00000808a5c0>] dump_backtrace+0x0/0x3d0
 [<ffff00000808a9a4>] show_stack+0x14/0x20
 [<ffff000008e6c0c0>] dump_stack+0xac/0xe4
 [<ffff0000080fe76c>] ___might_sleep+0x164/0x238
 [<ffff0000080fe890>] __might_sleep+0x50/0x88
 [<ffff0000082261e4>] kmem_cache_alloc+0x17c/0x1d0
 [<ffff000000ea0ae8>] ocelot_set_rx_mode+0x108/0x188 [mscc_ocelot_common]
 [<ffff000008cabcf0>] __dev_set_rx_mode+0x58/0xa0
 [<ffff000008cabd5c>] dev_set_rx_mode+0x24/0x38

Fixes: a556c76a ("net: mscc: Add initial Ocelot switch support")
Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Since the introduction of the vlan_stats_per_port option the netlink
export of it has been broken since I made a typo and used the ifla
attribute instead of the bridge option to retrieve its state.
Sysfs export is fine, only netlink export has been affected.

Fixes: 9163a0fc ("net: bridge: add support for per-port vlan stats")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

There is a spelling mistake in a DP_INFO message, fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

We find that sysctl_tipc_rmem and named_timeout do not have the right minimum
setting. sysctl_tipc_rmem should be larger than zero, like sysctl_tcp_rmem.
And named_timeout as a timeout setting should be not less than zero.

Fixes: cc79dd1b ("tipc: change socket buffer overflow control to respect sk_rcvbuf")
Fixes: a5325ae5 ("tipc: add name distributor resiliency queue")
Signed-off-by: Jie Liu <liujie165@huawei.com>
Reported-by: Qiang Ning <ningqiang1@huawei.com>
Reviewed-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

According to the link FSM, when a link endpoint got RESET_MSG (- a
traditional one without the stopping bit) from its peer, it moves to
PEER_RESET state and raises a LINK_DOWN event which then resets the
link itself. Its state will become ESTABLISHING after the reset event
and the link will be re-established soon after this endpoint starts to
send ACTIVATE_MSG to the peer.

There is no problem with this mechanism, however the link resetting has
cleared the link 'in_session' flag (along with the other important link
data such as: the link 'mtu') that was correctly set up at the 1st step
(i.e. when this endpoint received the peer RESET_MSG). As a result, the
link will become ESTABLISHED, but the 'in_session' flag is not set, and
all STATE_MSG from its peer will be dropped at the link_validate_msg().
It means the link not synced and will sooner or later face a failure.

Since the link reset action is obviously needed for a new link session
(this is also true in the other situations), the problem here is that
the link is re-established a bit too early when the link endpoints are
not really in-sync yet. The commit forces a resync as already done in
the previous commit 91986ee1 ("tipc: fix link session and
re-establish issues") by simply varying the link 'peer_session' value
at the link_reset().
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Tuong Lien <tuong.t.lien@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

skb_reorder_vlan_header() should move XDP meta data with ethernet header
if XDP meta data exists.

Fixes: de8f3a83 ("bpf: add meta pointer for direct access")
Signed-off-by: Yuya Kusakabe <yuya.kusakabe@gmail.com>
Signed-off-by: Takeru Hayasaka <taketarou2@gmail.com>
Co-developed-by: Takeru Hayasaka <taketarou2@gmail.com>
Reviewed-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

arg is controlled by user-space, hence leading to a potential
exploitation of the Spectre variant 1 vulnerability.

This issue was detected with the help of Smatch:

net/atm/lec.c:715 lec_mcast_attach() warn: potential spectre issue 'dev_lec' [r] (local cap)

Fix this by sanitizing arg before using it to index dev_lec.

Notice that given that speculation windows are large, the policy is
to kill the speculation on the first load and not worry if it can be
completed with a dependent load/store [1].

[1] https://lore.kernel.org/lkml/20180423164740.GY17484@dhcp22.suse.cz/Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The routine ptp_classifier_init() uses an initializer for an
automatic struct type variable which refers to an __initdata
symbol. This is perfectly legal, but may trigger a section
mismatch warning when running the compiler in -fpic mode, due
to the fact that the initializer may be emitted into an anonymous
.data section thats lack the __init annotation. So work around it
by using assignments instead.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When the commit below was introduced it changed two visible things:
 - the skb was no longer passed through the protocol handlers with the
   original device
 - the skb was passed up the stack with skb->dev = bridge

The first change broke af_packet sockets on bridge ports. For example we
use them for hostapd which listens for ETH_P_PAE packets on the ports.
We discussed two possible fixes:
 - create a clone and pass it through NF_HOOK(), act on the original skb
   based on the result
 - somehow signal to the caller from the okfn() that it was called,
   meaning the skb is ok to be passed, which this patch is trying to
   implement via returning 1 from the bridge link-local okfn()

Note that we rely on the fact that NF_QUEUE/STOLEN would return 0 and
drop/error would return < 0 thus the okfn() is called only when the
return was 1, so we signal to the caller that it was called by preserving
the return value from nf_hook().

Fixes: 8626c56c ("bridge: fix potential use-after-free when hook returns QUEUE or STOLEN verdict")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The intended behavior of function ipmi_hardcode_init_one() is to default
to kcs interface when no type argument is presented when initializing
ipmi with hard coded addresses.

However, the array of char pointers allocated on the stack by function
ipmi_hardcode_init() was not inited to zeroes, so it contained stack
debris.

Consequently, passing the cruft stored in this array to function
ipmi_hardcode_init_one() caused a crash when it was unable to detect
that the char * being passed was nonsense and tried to access the
address specified by the bogus pointer.

The fix is simply to initialize the si_type array to zeroes, so if
there were no type argument given to at the command line, function
ipmi_hardcode_init_one() could properly default to the kcs interface.
Signed-off-by: Tony Camuso <tcamuso@redhat.com>
Message-Id: <1554837603-40299-1-git-send-email-tcamuso@redhat.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

An extra memset was put into a place that cleared the interface
type.
Reported-by: Tony Camuso <tcamuso@redhat.com>
Fixes: 3cd83bac ("ipmi: Consolidate the adding of platform devices")
Signed-off-by: Corey Minyard <cminyard@mvista.com>

Merge tag 'riscv-for-linus-5.1-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux

Pull RISC-V fixes from Palmer Dabbelt:
 "This contains an assortment of RISC-V-related fixups that we found
  after rc4. They're all really unrelated:

   - The addition of a 32-bit defconfig, to emphasize testing the 32-bit
     port.

   - A device tree bindings patch, which is pre-work for some patches
     that target 5.2.

   - A fix to support booting on systems with more physical memory than
     the maximum supported by the kernel"

* tag 'riscv-for-linus-5.1-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux:
  RISC-V: Fix Maximum Physical Memory 2GiB option for 64bit systems
  dt-bindings: clock: sifive: add FU540-C000 PRCI clock constants
  RISC-V: Add separate defconfig for 32bit systems

Pull KVM fixes from Paolo Bonzini:
 "5.1 keeps its reputation as a big bugfix release for KVM x86.

   - Fix for a memory leak introduced during the merge window

   - Fixes for nested VMX with ept=0

   - Fixes for AMD (APIC virtualization, NMI injection)

   - Fixes for Hyper-V under KVM and KVM under Hyper-V

   - Fixes for 32-bit SMM and tests for SMM virtualization

   - More array_index_nospec peppering"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (21 commits)
  KVM: x86: avoid misreporting level-triggered irqs as edge-triggered in tracing
  KVM: fix spectrev1 gadgets
  KVM: x86: fix warning Using plain integer as NULL pointer
  selftests: kvm: add a selftest for SMM
  selftests: kvm: fix for compilers that do not support -no-pie
  selftests: kvm/evmcs_test: complete I/O before migrating guest state
  KVM: x86: Always use 32-bit SMRAM save state for 32-bit kernels
  KVM: x86: Don't clear EFER during SMM transitions for 32-bit vCPU
  KVM: x86: clear SMM flags before loading state while leaving SMM
  KVM: x86: Open code kvm_set_hflags
  KVM: x86: Load SMRAM in a single shot when leaving SMM
  KVM: nVMX: Expose RDPMC-exiting only when guest supports PMU
  KVM: x86: Raise #GP when guest vCPU do not support PMU
  x86/kvm: move kvm_load/put_guest_xcr0 into atomic context
  KVM: x86: svm: make sure NMI is injected after nmi_singlestep
  svm/avic: Fix invalidate logical APIC id entry
  Revert "svm: Fix AVIC incomplete IPI emulation"
  kvm: mmu: Fix overflow on kvm mmu page limit calculation
  KVM: nVMX: always use early vmcs check when EPT is disabled
  KVM: nVMX: allow tests to use bad virtual-APIC page address
  ...

In the oplock break handler, writing pending changes from pages puts
the FileInfo handle. If the refcount reaches zero it closes the handle
and waits for any oplock break handler to return, thus causing a deadlock.

To prevent this situation:

* We add a wait flag to cifsFileInfo_put() to decide whether we should
  wait for running/pending oplock break handlers

* We keep an additionnal reference of the SMB FileInfo handle so that
  for the rest of the handler putting the handle won't close it.
  - The ref is bumped everytime we queue the handler via the
    cifs_queue_oplock_break() helper.
  - The ref is decremented at the end of the handler

This bug was triggered by xfstest 464.

Also important fix to address the various reports of
oops in smb2_push_mandatory_locks
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
CC: Stable <stable@vger.kernel.org>

If we enter smb2_query_symlink() for something that is not a symlink
and where the SMB2_open() would succeed we would never end up
closing this handle and would thus leak a handle on the server.

Fix this by immediately calling SMB2_close() on successfull open.
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>

There is a KASAN slab-out-of-bounds:
BUG: KASAN: slab-out-of-bounds in _copy_from_iter_full+0x783/0xaa0
Read of size 80 at addr ffff88810c35e180 by task mount.cifs/539

CPU: 1 PID: 539 Comm: mount.cifs Not tainted 4.19 #10
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
            rel-1.12.0-0-ga698c8995f-prebuilt.qemu.org 04/01/2014
Call Trace:
 dump_stack+0xdd/0x12a
 print_address_description+0xa7/0x540
 kasan_report+0x1ff/0x550
 check_memory_region+0x2f1/0x310
 memcpy+0x2f/0x80
 _copy_from_iter_full+0x783/0xaa0
 tcp_sendmsg_locked+0x1840/0x4140
 tcp_sendmsg+0x37/0x60
 inet_sendmsg+0x18c/0x490
 sock_sendmsg+0xae/0x130
 smb_send_kvec+0x29c/0x520
 __smb_send_rqst+0x3ef/0xc60
 smb_send_rqst+0x25a/0x2e0
 compound_send_recv+0x9e8/0x2af0
 cifs_send_recv+0x24/0x30
 SMB2_open+0x35e/0x1620
 open_shroot+0x27b/0x490
 smb2_open_op_close+0x4e1/0x590
 smb2_query_path_info+0x2ac/0x650
 cifs_get_inode_info+0x1058/0x28f0
 cifs_root_iget+0x3bb/0xf80
 cifs_smb3_do_mount+0xe00/0x14c0
 cifs_do_mount+0x15/0x20
 mount_fs+0x5e/0x290
 vfs_kern_mount+0x88/0x460
 do_mount+0x398/0x31e0
 ksys_mount+0xc6/0x150
 __x64_sys_mount+0xea/0x190
 do_syscall_64+0x122/0x590
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

It can be reproduced by the following step:
  1. samba configured with: server max protocol = SMB2_10
  2. mount -o vers=default

When parse the mount version parameter, the 'ops' and 'vals'
was setted to smb30,  if negotiate result is smb21, just
update the 'ops' to smb21, but the 'vals' is still smb30.
When add lease context, the iov_base is allocated with smb21
ops, but the iov_len is initiallited with the smb30. Because
the iov_len is longer than iov_base, when send the message,
copy array out of bounds.

we need to keep the 'ops' and 'vals' consistent.

Fixes: 9764c02f ("SMB3: Add support for multidialect negotiate (SMB2.1 and later)")
Fixes: d5c7076b ("smb3: add smb3.1.1 to default dialect list")
Signed-off-by: ZhangXiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>

There is a KASAN use-after-free:
BUG: KASAN: use-after-free in SMB2_read+0x1136/0x1190
Read of size 8 at addr ffff8880b4e45e50 by task ln/1009

Should not release the 'req' because it will use in the trace.

Fixes: eccb4422 ("smb3: Add ftrace tracepoints for improved SMB3 debugging")
Signed-off-by: ZhangXiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org> 4.18+
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>

There is a KASAN use-after-free:
BUG: KASAN: use-after-free in SMB2_write+0x1342/0x1580
Read of size 8 at addr ffff8880b6a8e450 by task ln/4196

Should not release the 'req' because it will use in the trace.

Fixes: eccb4422 ("smb3: Add ftrace tracepoints for improved SMB3 debugging")
Signed-off-by: ZhangXiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org> 4.18+
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>

In __apic_accept_irq() interface trig_mode is int and actually on some code
paths it is set above u8:

kvm_apic_set_irq() extracts it from 'struct kvm_lapic_irq' where trig_mode
is u16. This is done on purpose as e.g. kvm_set_msi_irq() sets it to
(1 << 15) & e->msi.data

kvm_apic_local_deliver sets it to reg & (1 << 15).

Fix the immediate issue by making 'tm' into u16. We may also want to adjust
__apic_accept_irq() interface and use proper sizes for vector, level,
trig_mode but this is not urgent.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

These were found with smatch, and then generalized when applicable.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Changed passing argument as "0 to NULL" which resolves below sparse warning

arch/x86/kvm/x86.c:3096:61: warning: Using plain integer as NULL pointer
Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Add a simple test for SMM, based on VMX.  The test implements its own
sync between the guest and the host as using our ucall library seems to
be too cumbersome: SMI handler is happening in real-address mode.

This patch also fixes KVM_SET_NESTED_STATE to happen after
KVM_SET_VCPU_EVENTS, in fact it places it last.  This is because
KVM needs to know whether the processor is in SMM or not.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

-no-pie was added to GCC at the same time as their configuration option
--enable-default-pie.  Compilers that were built before do not have
-no-pie, but they also do not need it.  Detect the option at build
time.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Starting state migration after an IO exit without first completing IO
may result in test failures.  We already have two tests that need this
(this patch in fact fixes evmcs_test, similar to what was fixed for
state_test in commit 0f73bbc8, "KVM: selftests: complete IO before
migrating guest state", 2019-03-13) and a third is coming.  So, move the
code to vcpu_save_state, and while at it do not access register state
until after I/O is complete.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>