current->group_leader->exit_signal may change during copy_process() if
current->real_parent exits.

Move the assignment inside tasklist_lock to avoid the race.

Signed-off-by: Eddy Wu <eddy_wu@trendmicro.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull xfs fixes from Darrick Wong:

 - Fix an uninitialized struct problem

 - Fix an iomap problem zeroing unwritten EOF blocks

 - Fix some clumsy error handling when writeback fails on filesystems
   with blocksize < pagesize

 - Fix a retry loop not resetting loop variables properly

 - Fix scrub flagging rtinherit inodes on a non-rt fs, since the kernel
   actually does permit that combination

 - Fix excessive page cache flushing when unsharing part of a file

* tag 'xfs-5.10-fixes-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: only flush the unshared range in xfs_reflink_unshare
  xfs: fix scrub flagging rtinherit even if there is no rt device
  xfs: fix missing CoW blocks writeback conversion retry
  iomap: clean up writeback state logic on writepage error
  iomap: support partial page discard on writeback block mapping failure
  xfs: flush new eof page on truncate to avoid post-eof corruption
  xfs: set xefi_discard when creating a deferred agfl free log intent item

Merge procfs splice read fixes from Christoph Hellwig:
 "Greg reported a problem due to the fact that Android tests use procfs
  files to test splice, which stopped working with the changes for
  set_fs() removal.

  This series adds read_iter support for seq_file, and uses those for
  various proc files using seq_file to restore splice read support"

[ Side note: Christoph initially had a scripted "move everything over"
  patch, which looks fine, but I personally would prefer us to actively
  discourage splice() on random files.  So this does just the minimal
  basic core set of proc file op conversions.

  For completeness, and in case people care, that script was

     sed -i -e 's/\.proc_read\(\s*=\s*\)seq_read/\.proc_read_iter\1seq_read_iter/g'

  but I'll wait and see if somebody has a strong argument for using
  splice on random small /proc files before I'd run it on the whole
  kernel.   - Linus ]

* emailed patches from Christoph Hellwig <hch@lst.de>:
  proc "seq files": switch to ->read_iter
  proc "single files": switch to ->read_iter
  proc/stat: switch to ->read_iter
  proc/cpuinfo: switch to ->read_iter
  proc: wire up generic_file_splice_read for iter ops
  seq_file: add seq_read_iter

Pull x86 fixes from Thomas Gleixner:
 "A set of x86 fixes:

   - Use SYM_FUNC_START_WEAK in the mem* ASM functions instead of a
     combination of .weak and SYM_FUNC_START_LOCAL which makes LLVMs
     integrated assembler upset

   - Correct the mitigation selection logic which prevented the related
     prctl to work correctly

   - Make the UV5 hubless system work correctly by fixing up the
     malformed table entries and adding the missing ones"

* tag 'x86-urgent-2020-11-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/platform/uv: Recognize UV5 hubless system identifier
  x86/platform/uv: Remove spaces from OEM IDs
  x86/platform/uv: Fix missing OEM_TABLE_ID
  x86/speculation: Allow IBPB to be conditionally enabled on CPUs with always-on STIBP
  x86/lib: Change .weak to SYM_FUNC_START_WEAK for arch/x86/lib/mem*_64.S

Pull perf fix from Thomas Gleixner:
 "A single fix for the perf core plugging a memory leak in the address
  filter parser"

* tag 'perf-urgent-2020-11-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Fix a memory leak in perf_event_parse_addr_filter()

Pull futex fix from Thomas Gleixner:
 "A single fix for the futex code where an intermediate state in the
  underlying RT mutex was not handled correctly and triggering a BUG()
  instead of treating it as another variant of retry condition"

* tag 'locking-urgent-2020-11-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  futex: Handle transient "ownerless" rtmutex state correctly

Pull irq fixes from Thomas Gleixner:
 "A set of fixes for interrupt chip drivers:

   - Fix the fallout of the IPI as interrupt conversion in Kconfig and
     the BCM2836 interrupt chip driver

   - Fixes for interrupt affinity setting and the handling of
     hierarchical irq domains in the SiFive PLIC driver

   - Make the unmapped event handling in the TI SCI driver work
     correctly

   - A few minor fixes and cleanups in various chip drivers and Kconfig"

* tag 'irq-urgent-2020-11-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  dt-bindings: irqchip: ti, sci-inta: Fix diagram indentation for unmapped events
  irqchip/ti-sci-inta: Add support for unmapped event handling
  dt-bindings: irqchip: ti, sci-inta: Update for unmapped event handling
  irqchip/renesas-intc-irqpin: Merge irlm_bit and needs_irlm
  irqchip/sifive-plic: Fix chip_data access within a hierarchy
  irqchip/sifive-plic: Fix broken irq_set_affinity() callback
  irqchip/stm32-exti: Add all LP timer exti direct events support
  irqchip/bcm2836: Fix missing __init annotation
  irqchip/mips: Drop selection of IRQ_DOMAIN_HIERARCHY
  irqchip/mst: Make mst_intc_of_init static
  irqchip/mst: MST_IRQ should depend on ARCH_MEDIATEK or ARCH_MSTARV7
  genirq: Let GENERIC_IRQ_IPI select IRQ_DOMAIN_HIERARCHY

Pull entry code fix from Thomas Gleixner:
 "A single fix for the generic entry code to correct the wrong
  assumption that the lockdep interrupt state needs not to be
  established before calling the RCU check"

* tag 'core-urgent-2020-11-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  entry: Fix the incorrect ordering of lockdep and RCU check

Pull powerpc fixes from Michael Ellerman:

 - fix miscompilation with GCC 4.9 by using asm_goto_volatile for put_user()

 - fix for an RCU splat at boot caused by a recent lockdep change

 - fix for a possible deadlock in our EEH debugfs code

 - several fixes for handling of _PAGE_ACCESSED on 32-bit platforms

 - build fix when CONFIG_NUMA=n

Thanks to Andreas Schwab, Christophe Leroy, Oliver O'Halloran, Qian Cai,
and Scott Cheloha.

* tag 'powerpc-5.10-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/numa: Fix build when CONFIG_NUMA=n
  powerpc/8xx: Manage _PAGE_ACCESSED through APG bits in L1 entry
  powerpc/8xx: Always fault when _PAGE_ACCESSED is not set
  powerpc/40x: Always fault when _PAGE_ACCESSED is not set
  powerpc/603: Always fault when _PAGE_ACCESSED is not set
  powerpc: Use asm_goto_volatile for put_user()
  powerpc/smp: Call rcu_cpu_starting() earlier
  powerpc/eeh_cache: Fix a possible debugfs deadlock

Pull block fixes from Jens Axboe:

 - NVMe pull request from Christoph:
    - revert a nvme_queue size optimization (Keith Bush)
    - fabrics timeout races fixes (Chao Leng and Sagi Grimberg)"

 - null_blk zone locking fix (Damien)

* tag 'block-5.10-2020-11-07' of git://git.kernel.dk/linux-block:
  null_blk: Fix scheduling in atomic with zoned mode
  nvme-tcp: avoid repeated request completion
  nvme-rdma: avoid repeated request completion
  nvme-tcp: avoid race between time out and tear down
  nvme-rdma: avoid race between time out and tear down
  nvme: introduce nvme_sync_io_queues
  Revert "nvme-pci: remove last_sq_tail"

Pull io_uring fixes from Jens Axboe:
 "A set of fixes for io_uring:

   - SQPOLL cancelation fixes

   - Two fixes for the io_identity COW

   - Cancelation overflow fix (Pavel)

   - Drain request cancelation fix (Pavel)

   - Link timeout race fix (Pavel)"

* tag 'io_uring-5.10-2020-11-07' of git://git.kernel.dk/linux-block:
  io_uring: fix link lookup racing with link timeout
  io_uring: use correct pointer for io_uring_show_cred()
  io_uring: don't forget to task-cancel drained reqs
  io_uring: fix overflowed cancel w/ linked ->files
  io_uring: drop req/tctx io_identity separately
  io_uring: ensure consistent view of original task ->mm from SQPOLL
  io_uring: properly handle SQPOLL request cancelations
  io-wq: cancel request if it's asking for files and we don't have them

Gratian managed to trigger the BUG_ON(!newowner) in fixup_pi_state_owner().
This is one possible chain of events leading to this:

Task Prio       Operation
T1   120	lock(F)
T2   120	lock(F)   -> blocks (top waiter)
T3   50 (RT)	lock(F)   -> boosts T1 and blocks (new top waiter)
XX   		timeout/  -> wakes T2
		signal
T1   50		unlock(F) -> wakes T3 (rtmutex->owner == NULL, waiter bit is set)
T2   120	cleanup   -> try_to_take_mutex() fails because T3 is the top waiter
     			     and the lower priority T2 cannot steal the lock.
     			  -> fixup_pi_state_owner() sees newowner == NULL -> BUG_ON()

The comment states that this is invalid and rt_mutex_real_owner() must
return a non NULL owner when the trylock failed, but in case of a queued
and woken up waiter rt_mutex_real_owner() == NULL is a valid transient
state. The higher priority waiter has simply not yet managed to take over
the rtmutex.

The BUG_ON() is therefore wrong and this is just another retry condition in
fixup_pi_state_owner().

Drop the locks, so that T3 can make progress, and then try the fixup again.

Gratian provided a great analysis, traces and a reproducer. The analysis is
to the point, but it confused the hell out of that tglx dude who had to
page in all the futex horrors again. Condensed version is above.

[ tglx: Wrote comment and changelog ]

Fixes: c1e2f0ea

 ("futex: Avoid violating the 10th rule of futex")
Reported-by: Gratian Crisan <gratian.crisan@ni.com>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/87a6w6x7bb.fsf@ni.com
Link: https://lore.kernel.org/r/87sg9pkvf7.fsf@nanos.tec.linutronix.de

Pull i2c fixes from Wolfram Sang:
 "Driver bugfixes for I2C.

  Most of them are for the new mlxbf driver which got more exposure
  after rc1. The sh_mobile patch should already have reached you during
  the merge window, but I accidently dropped it. However, since it fixes
  a problem with rebooting, it is still fine for rc3"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: designware: slave should do WRITE_REQUESTED before WRITE_RECEIVED
  i2c: designware: call i2c_dw_read_clear_intrbits_slave() once
  i2c: mlxbf: I2C_MLXBF should depend on MELLANOX_PLATFORM
  i2c: mlxbf: Update author and maintainer email info
  i2c: mlxbf: Update reference clock frequency
  i2c: mlxbf: Remove unecessary wrapper functions
  i2c: mlxbf: Fix resrticted cast warning of sparse
  i2c: mlxbf: Add CONFIG_ACPI to guard ACPI function call
  i2c: sh_mobile: implement atomic transfers
  i2c: mediatek: move dma reset before i2c reset

Pull RISC-V fixes from Palmer Dabbelt:

 - SPDX comment style fix

 - ignore memory that is unusable

 - avoid setting a kernel text offset for the !MMU kernels, where
   skipping the first page of memory is both unnecessary and costly

 - avoid passing the flag bits in satp to pfn_to_virt()

 - fix __put_kernel_nofault, where we had the arguments to
   __put_user_nocheck reversed

 - workaround for a bug in the FU540 to avoid triggering PMP issues
   during early boot

 - change to how we pull symbols out of the vDSO. The old mechanism was
   removed from binutils-2.35 (and has been backported to Debian's 2.34)

* tag 'riscv-for-linus-5.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  RISC-V: Fix the VDSO symbol generaton for binutils-2.35+
  RISC-V: Use non-PGD mappings for early DTB access
  riscv: uaccess: fix __put_kernel_nofault()
  riscv: fix pfn_to_virt err in do_page_fault().
  riscv: Set text_offset correctly for M-Mode
  RISC-V: Remove any memblock representing unusable memory area
  risc-v: kernel: ftrace: Fixes improper SPDX comment style

As shown through runtime testing, the "filename" allocation is not
always freed in perf_event_parse_addr_filter().

There are three possible ways that this could happen:

 - It could be allocated twice on subsequent iterations through the loop,
 - or leaked on the success path,
 - or on the failure path.

Clean up the code flow to make it obvious that 'filename' is always
freed in the reallocation path and in the two return paths as well.

We rely on the fact that kfree(NULL) is NOP and filename is initialized
with NULL.

This fixes the leak. No other side effects expected.

[ Dan Carpenter: cleaned up the code flow & added a changelog. ]
[ Ingo Molnar: updated the changelog some more. ]

Fixes: 375637bc

 ("perf/core: Introduce address range filtering")
Signed-off-by: "kiyin(尹亮)" <kiyin@tencent.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: "Srivatsa S. Bhat" <srivatsa@csail.mit.edu>
Cc: Anthony Liguori <aliguori@amazon.com>
--
 kernel/events/core.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

Testing shows a problem in that UV5 hubless systems were not being
recognized.  Add them to the list of OEM IDs checked.

Fixes: 6c779442

 ("Add UV5 direct references")
Signed-off-by: Mike Travis <mike.travis@hpe.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201105222741.157029-4-mike.travis@hpe.com

Testing shows that trailing spaces caused problems with the OEM_ID and
the OEM_TABLE_ID.  One being that the OEM_ID would not string compare
correctly.  Another the OEM_ID and OEM_TABLE_ID would be concatenated
in the printout.  Remove any trailing spaces.

Fixes: 1e61f5a9

 ("Add and decode Arch Type in UVsystab")
Signed-off-by: Mike Travis <mike.travis@hpe.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201105222741.157029-3-mike.travis@hpe.com

Testing shows a problem in that the OEM_TABLE_ID was missing for
hubless systems.  This is used to determine the APIC type (legacy or
extended).  Add the OEM_TABLE_ID to the early hubless processing.

Fixes: 1e61f5a9

 ("Add and decode Arch Type in UVsystab")
Signed-off-by: Mike Travis <mike.travis@hpe.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201105222741.157029-2-mike.travis@hpe.com

Pull ceph fix from Ilya Dryomov:
 "A fix for a potential stall on umount caused by the MDS dropping our
  REQUEST_CLOSE message. The code that handled this case was
  inadvertently disabled in 5.9, this patch removes it entirely and
  fixes the problem in a way that is consistent with ceph-fuse"

* tag 'ceph-for-5.10-rc3' of git://github.com/ceph/ceph-client:
  ceph: check session state after bumping session->s_seq

Merge tag 'linux-kselftest-fixes-5.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull Kselftest fixes from Shuah Khan:
 "Fixes to the ftrace test and several fixes from Tommi Rantala for
  various other tests"

* tag 'linux-kselftest-fixes-5.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
  selftests: binderfs: use SKIP instead of XFAIL
  selftests: clone3: use SKIP instead of XFAIL
  selftests: core: use SKIP instead of XFAIL in close_range_test.c
  selftests: proc: fix warning: _GNU_SOURCE redefined
  selftests: pidfd: drop needless linux/kcmp.h inclusion in pidfd_setns_test.c
  selftests: pidfd: add CONFIG_CHECKPOINT_RESTORE=y to config
  selftests: pidfd: skip test on kcmp() ENOSYS
  selftests: pidfd: use ksft_test_result_skip() when skipping test
  selftests/harness: prettify SKIP message whitespace again
  selftests: pidfd: fix compilation errors due to wait.h
  selftests: filter kselftest headers from command in lib.mk
  selftests/ftrace: check for do_sys_openat2 in user-memory test
  selftests/ftrace: Use $FUNCTION_FORK to reference kernel fork function

Pull SCSI fixes from James Bottomley:
 "Three driver fixes. Two (alua and hpsa) are in hard to trigger
  attach/detach situations but the mp3sas one involves a polled to
  interrupt switch over that could trigger in any high IOPS situation"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: mpt3sas: Fix timeouts observed while reenabling IRQ
  scsi: scsi_dh_alua: Avoid crash during alua_bus_detach()
  scsi: hpsa: Fix memory leak in hpsa_init_one()

Pull mtd fixes from Miquel Raynal.

* 'mtd/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux:
  mtd: rawnand: stm32_fmc2: fix broken ECC
  mtd: spi-nor: Fix address width on flash chips > 16MB
  mtd: spi-nor: Don't copy self-pointing struct around
  mtd: rawnand: ifc: Move the ECC engine initialization to the right place
  mtd: rawnand: mxc: Move the ECC engine initialization to the right place

Pull spi fix from Mark Brown:
 "This is an additional fix on top of 5e31ba0c ('spi: bcm2835: fix
  gpio cs level inversion') - when sending my prior pull request I had
  misremembred the status of that patch, apologies for the noise here"

* tag 'spi-fix-v5.10-rc2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi: bcm2835: remove use of uninitialized gpio flags variable

Pull sound fixes from Takashi Iwai:
 "Quite a bunch of small fixes that have been gathered since the last
  pull, including changes like below:

   - HD-audio runtime PM fixes and refactoring

   - HD-audio and USB-audio quirks

   - SOF warning fix

   - Various ASoC device-specific fixes for Intel, Qualcomm, etc"

* tag 'sound-5.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (26 commits)
  ALSA: usb-audio: Add implicit feedback quirk for Qu-16
  ASoC: mchp-spdiftx: Do not set Validity bit(s)
  ALSA: usb-audio: Add implicit feedback quirk for MODX
  ALSA: usb-audio: add usb vendor id as DSD-capable for Khadas devices
  ALSA: hda/realtek - Enable headphone for ASUS TM420
  ALSA: hda: prevent undefined shift in snd_hdac_ext_bus_get_link()
  ASoC: qcom: lpass-cpu: Fix clock disable failure
  ASoC: qcom: lpass-sc7180: Fix MI2S bitwidth field bit positions
  ASoC: codecs: wcd9335: Set digital gain range correctly
  ASoC: codecs: wcd934x: Set digital gain range correctly
  ALSA: hda: Reinstate runtime_allow() for all hda controllers
  ALSA: hda: Separate runtime and system suspend
  ALSA: hda: Refactor codec PM to use direct-complete optimization
  ALSA: hda/realtek - Fixed HP headset Mic can't be detected
  ALSA: usb-audio: Add implicit feedback quirk for Zoom UAC-2
  ALSA: make snd_kcontrol_new name a normal string
  ALSA: fix kernel-doc markups
  ASoC: SOF: loader: handle all SOF_IPC_EXT types
  ASoC: cs42l51: manage mclk shutdown delay
  ASoC: qcom: sdm845: set driver name correctly
  ...

Pull drm fixes from Dave Airlie:
 "It's Friday here so that means another installment of drm fixes to
  distract you from the counting process.

  Changes all over the place, the amdgpu changes contain support for a
  new GPU that is close to current one already in the tree (Green
  Sardine) so it shouldn't have much side effects.

  Otherwise imx has a few cleanup patches and fixes, amdgpu and i915
  have around the usual smattering of fixes, fonts got constified, and
  vc4/panfrost has some minor fixes. All in all a fairly regular rc3.

  We have an outstanding nouveau regression, but the author is looking
  into the fix, so should be here next week.

  I now return you to counting.

  fonts:
   - constify font structures.

  MAINTAINERS:
   - Fix path for amdgpu power management

  amdgpu:
   - Add support for more navi1x SKUs
   - Fix for suspend on CI dGPUs
   - VCN DPG fix for Picasso
   - Sienna Cichlid fixes
   - Polaris DPM fix
   - Add support for Green Sardine

  amdkfd:
   - Fix an allocation failure check

  i915:
   - Fix set domain's cache coherency
   - Fixes around breadcrumbs
   - Fix encoder lookup during PSR atomic
   - Hold onto an explicit ref to i915_vma_work.pinned
   - gvt: HWSP reset handling fix
   - gvt: flush workaround
   - gvt: vGPU context pin/unpin
   - gvt: mmio cmd access fix for bxt/apl

  imx:
   - drop unused functions and callbacks
   - reuse imx_drm_encoder_parse_of
   - spinlock rework
   - memory leak fix
   - minor cleanups

  vc4:
   - resource cleanup fix

  panfrost:
   - madvise/shrinker fix"

* tag 'drm-fixes-2020-11-06-1' of git://anongit.freedesktop.org/drm/drm: (55 commits)
  drm/amdgpu/display: remove DRM_AMD_DC_GREEN_SARDINE
  drm/amd/display: Add green_sardine support to DM
  drm/amd/display: Add green_sardine support to DC
  drm/amdgpu: enable vcn support for green_sardine (v2)
  drm/amdgpu: enable green_sardine_asd.bin loading (v2)
  drm/amdgpu/sdma: add sdma engine support for green_sardine (v2)
  drm/amdgpu: add gfx support for green_sardine (v2)
  drm/amdgpu: add soc15 common ip block support for green_sardine (v3)
  drm/amdgpu: add green_sardine support for gpu_info and ip block setting (v2)
  drm/amdgpu: add Green_Sardine APU flag
  drm/amdgpu: resolved ASD loading issue on sienna
  amdkfd: Check kvmalloc return before memcpy
  drm/amdgpu: update golden setting for sienna_cichlid
  amd/amdgpu: Disable VCN DPG mode for Picasso
  drm/amdgpu/swsmu: remove duplicate call to smu_set_default_dpm_table
  drm/i915: Hold onto an explicit ref to i915_vma_work.pinned
  drm/i915/gt: Flush xcs before tgl breadcrumbs
  drm/i915/gt: Expose more parameters for emitting writes into the ring
  drm/i915: Fix encoder lookup during PSR atomic check
  drm/i915/gt: Use the local HWSP offset during submission
  ...

Merge tag 'tpmdd-next-v5.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd

Pull tpm fixes from Jarkko Sakkinen:
 "Two critical tpm driver bug fixes"

* tag 'tpmdd-next-v5.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd:
  tpm: efi: Don't create binary_bios_measurements file for an empty log
  tpm_tis: Disable interrupts on ThinkPad T490s

Pull iommu fixes from Joerg Roedel:

 - Fix a NULL-ptr dereference in the Intel VT-d driver

 - Two fixes for Intel SVM support

 - Increase IRQ remapping table size in the AMD IOMMU driver. The old
   number of 128 turned out to be too low for some recent devices.

 - Fix a mask check in generic IOMMU code

* tag 'iommu-fixes-v5.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu: Fix a check in iommu_check_bind_data()
  iommu/vt-d: Fix a bug for PDP check in prq_event_thread
  iommu/vt-d: Fix sid not set issue in intel_svm_bind_gpasid()
  iommu/vt-d: Fix kernel NULL pointer dereference in find_domain()
  iommu/amd: Increase interrupt remapping table limit to 512 entries

Pull VFIO fixes from Alex Williamson:

 - Remove code by using existing helper (Zenghui Yu)

 - fsl-mc copy-user return and underflow fixes (Dan Carpenter)

 - fsl-mc static function declaration (Diana Craciun)

 - Fix ioeventfd sleeping under spinlock (Alex Williamson)

 - Fix pm reference count leak in vfio-platform (Zhang Qilong)

 - Allow opening IGD device w/o OpRegion support (Fred Gao)

* tag 'vfio-v5.10-rc3' of git://github.com/awilliam/linux-vfio:
  vfio/pci: Bypass IGD init in case of -ENODEV
  vfio: platform: fix reference leak in vfio_platform_open
  vfio/pci: Implement ioeventfd thread handler for contended memory lock
  vfio/fsl-mc: Make vfio_fsl_mc_irqs_allocate static
  vfio/fsl-mc: prevent underflow in vfio_fsl_mc_mmap()
  vfio/fsl-mc: return -EFAULT if copy_to_user() fails
  vfio/type1: Use the new helper to find vfio_group

Pull arm64 fixes from Will Deacon:
 "Here's the weekly batch of fixes for arm64. Not an awful lot here, but
  there are still a few unresolved issues relating to CPU hotplug, RCU
  and IRQ tracing that I hope to queue fixes for next week.

  Summary:

   - Fix early use of kprobes

   - Fix kernel placement in kexec_file_load()

   - Bump maximum number of NUMA nodes"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: kexec_file: try more regions if loading segments fails
  arm64: kprobes: Use BRK instead of single-step when executing instructions out-of-line
  arm64: NUMA: Kconfig: Increase NODES_SHIFT to 4

Pull ARC fixes from Vineet Gupta:

 - Unbork HSDKv1 platform (won't boot) due to memory map issue

 - Prevent stack unwinder from infinite looping

* tag 'arc-5.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: [plat-hsdk] Remap CCMs super early in asm boot trampoline
  ARC: stack unwinding: avoid indefinite looping

Pull s390 fixes from Heiko Carstens:

 - fix reference counting for ap devices

 - fix paes selftest

 - fix pmd_deref()/pud_deref() so they can also handle large pages

 - remove unused vdso file and defines

 - update defconfigs

 - call rcu_cpu_starting() early in smp init code to avoid lockdep
   warnings

 - fix hotplug of PCI function missing bus

* tag 's390-5.10-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/pci: fix hot-plug of PCI function missing bus
  s390/smp: move rcu_cpu_starting() earlier
  s390/pkey: fix paes selftest failure with paes and pkey static build
  s390: update defconfigs
  s390/vdso: remove unused constants
  s390/vdso: remove empty unused file
  s390/mm: make pmd/pud_deref() large page aware
  s390/ap: fix ap devices reference counting

Pull networking fixes from Jakub Kicinski:
 "Networking fixes for 5.10-rc3, including fixes from wireless, can, and
  netfilter subtrees.

  Current merge window - bugs in new features:

   - can: isotp: isotp_rcv_cf(): enable RX timeout handling in
     listen-only mode

  Previous releases - regressions:

   - mac80211:
      - don't require VHT elements for HE on 2.4 GHz
      - fix regression where EAPOL frames were sent in plaintext

   - netfilter:
      - ipset: Update byte and packet counters regardless of whether
        they match

   - ip_tunnel: fix over-mtu packet send by allowing fragmenting even if
     inner packet has IP_DF (don't fragment) set in its header (when
     TUNNEL_DONT_FRAGMENT flag is not set on the tunnel dev)

   - net: fec: fix MDIO probing for some FEC hardware blocks

   - ip6_tunnel: set inner ipproto before ip6_tnl_encap to un-break gso
     support

   - sctp: Fix COMM_LOST/CANT_STR_ASSOC err reporting on big-endian
     platforms, sparse-related fix used the wrong integer size

  Previous releases - always broken:

   - netfilter: use actual socket sk rather than skb sk when routing
     harder

   - r8169: work around short packet hw bug on RTL8125 by padding frames

   - net: ethernet: ti: cpsw: disable PTPv1 hw timestamping
     advertisement, the hardware does not support it

   - chelsio/chtls: fix always leaking ctrl_skb and another leak caused
     by a race condition

   - fix drivers incorrectly writing into skbs on TX:
      - cadence: force nonlinear buffers to be cloned
      - gianfar: Account for Tx PTP timestamp in the skb headroom
      - gianfar: Replace skb_realloc_headroom with skb_cow_head for PTP

   - can: flexcan:
      - remove FLEXCAN_QUIRK_DISABLE_MECR quirk for LS1021A
      - add ECC initialization for VF610 and LX2160A
      - flexcan_remove(): disable wakeup completely

   - can: fix packet echo functionality:
      - peak_canfd: fix echo management when loopback is on
      - make sure skbs are not freed in IRQ context in case they need to
        be dropped
      - always clone the skbs to make sure they have a reference on the
        socket, and prevent it from disappearing
      - fix real payload length return value for RTR frames

   - can: j1939: return failure on bind if netdev is down, rather than
     waiting indefinitely

  Misc:

   - IPv6: reply ICMP error if the first fragment don't include all
     headers to improve compliance with RFC 8200"

* tag 'net-5.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (66 commits)
  ionic: check port ptr before use
  r8169: work around short packet hw bug on RTL8125
  net: openvswitch: silence suspicious RCU usage warning
  chelsio/chtls: fix always leaking ctrl_skb
  chelsio/chtls: fix memory leaks caused by a race
  can: flexcan: flexcan_remove(): disable wakeup completely
  can: flexcan: add ECC initialization for VF610
  can: flexcan: add ECC initialization for LX2160A
  can: flexcan: remove FLEXCAN_QUIRK_DISABLE_MECR quirk for LS1021A
  can: mcp251xfd: remove unneeded break
  can: mcp251xfd: mcp251xfd_regmap_nocrc_read(): fix semicolon.cocci warnings
  can: mcp251xfd: mcp251xfd_regmap_crc_read(): increase severity of CRC read error messages
  can: peak_canfd: pucan_handle_can_rx(): fix echo management when loopback is on
  can: peak_usb: peak_usb_get_ts_time(): fix timestamp wrapping
  can: peak_usb: add range checking in decode operations
  can: xilinx_can: handle failure cases of pm_runtime_get_sync
  can: ti_hecc: ti_hecc_probe(): add missed clk_disable_unprepare() in error path
  can: isotp: padlen(): make const array static, makes object smaller
  can: isotp: isotp_rcv_cf(): enable RX timeout handling in listen-only mode
  can: isotp: Explain PDU in CAN_ISOTP help text
  ...

Implement ->read_iter for all proc "seq files" so that splice works on
them.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Implement ->read_iter for all proc "single files" so that more bionic
tests cases can pass when they call splice() on other fun files like
/proc/version

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Implement ->read_iter so that splice can be used on this file.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Implement ->read_iter so that the Android bionic test suite can use
this random proc file for its splice test case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Wire up generic_file_splice_read for the iter based proxy ops, so
that splice reads from them work.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

iov_iter based variant for reading a seq_file.  seq_read is
reimplemented on top of the iter variant.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Commit aa1c09cb ("null_blk: Fix locking in zoned mode") changed
zone locking to using the potentially sleeping wait_on_bit_io()
function. This is acceptable when memory backing is enabled as the
device queue is in that case marked as blocking, but this triggers a
scheduling while in atomic context with memory backing disabled.

Fix this by relying solely on the device zone spinlock for zone
information protection without temporarily releasing this lock around
null_process_cmd() execution in null_zone_write(). This is OK to do
since when memory backing is disabled, command processing does not
block and the memory backing lock nullb->lock is unused. This solution
avoids the overhead of having to mark a zoned null_blk device queue as
blocking when memory backing is unused.

This patch also adds comments to the zone locking code to explain the
unusual locking scheme.

Fixes: aa1c09cb

 ("null_blk: Fix locking in zoned mode")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Mimic the pre-existing ACPI and Device Tree event log behavior by not
creating the binary_bios_measurements file when the EFI TPM event log is
empty.

This fixes the following NULL pointer dereference that can occur when
reading /sys/kernel/security/tpm0/binary_bios_measurements after the
kernel received an empty event log from the firmware:

 BUG: kernel NULL pointer dereference, address: 000000000000002c
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 0 P4D 0
 Oops: 0000 [#1] SMP PTI
 CPU: 2 PID: 3932 Comm: fwupdtpmevlog Not tainted 5.9.0-00003-g629990edad62 #17
 Hardware name: LENOVO 20LCS03L00/20LCS03L00, BIOS N27ET38W (1.24 ) 11/28/2019
 RIP: 0010:tpm2_bios_measurements_start+0x3a/0x550
 Code: 54 53 48 83 ec 68 48 8b 57 70 48 8b 1e 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 48 8b 82 c0 06 00 00 48 8b 8a c8 06 00 00 <44> 8b 60 1c 48 89 4d a0 4c 89 e2 49 83 c4 20 48 83 fb 00 75 2a 49
 RSP: 0018:ffffa9c901203db0 EFLAGS: 00010246
 RAX: 0000000000000010 RBX: 0000000000000000 RCX: 0000000000000010
 RDX: ffff8ba1eb99c000 RSI: ffff8ba1e4ce8280 RDI: ffff8ba1e4ce8258
 RBP: ffffa9c901203e40 R08: ffffa9c901203dd8 R09: ffff8ba1ec443300
 R10: ffffa9c901203e50 R11: 0000000000000000 R12: ffff8ba1e4ce8280
 R13: ffffa9c901203ef0 R14: ffffa9c901203ef0 R15: ffff8ba1e4ce8258
 FS:  00007f6595460880(0000) GS:ffff8ba1ef880000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 000000000000002c CR3: 00000007d8d18003 CR4: 00000000003706e0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 Call Trace:
  ? __kmalloc_node+0x113/0x320
  ? kvmalloc_node+0x31/0x80
  seq_read+0x94/0x420
  vfs_read+0xa7/0x190
  ksys_read+0xa7/0xe0
  __x64_sys_read+0x1a/0x20
  do_syscall_64+0x37/0x80
  entry_SYSCALL_64_after_hwframe+0x44/0xa9

In this situation, the bios_event_log pointer in the tpm_bios_log struct
was not NULL but was equal to the ZERO_SIZE_PTR (0x10) value. This was
due to the following kmemdup() in tpm_read_log_efi():

int tpm_read_log_efi(struct tpm_chip *chip)
{
...
	/* malloc EventLog space */
	log->bios_event_log = kmemdup(log_tbl->log, log_size, GFP_KERNEL);
	if (!log->bios_event_log) {
		ret = -ENOMEM;
		goto out;
	}
...
}

When log_size is zero, due to an empty event log from firmware,
ZERO_SIZE_PTR is returned from kmemdup(). Upon a read of the
binary_bios_measurements file, the tpm2_bios_measurements_start()
function does not perform a ZERO_OR_NULL_PTR() check on the
bios_event_log pointer before dereferencing it.

Rather than add a ZERO_OR_NULL_PTR() check in functions that make use of
the bios_event_log pointer, simply avoid creating the
binary_bios_measurements_file as is done in other event log retrieval
backends.

Explicitly ignore all of the events in the final event log when the main
event log is empty. The list of events in the final event log cannot be
accurately parsed without referring to the first event in the main event
log (the event log header) so the final event log is useless in such a
situation.

Fixes: 58cc1e4f ("tpm: parse TPM event logs based on EFI table")
Link: https://lore.kernel.org/linux-integrity/E1FDCCCB-CA51-4AEE-AC83-9CDE995EAE52@canonical.com/


Reported-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Reported-by: Kenneth R. Crudup <kenny@panix.com>
Reported-by: Mimi Zohar <zohar@linux.ibm.com>
Cc: Thiébaud Weksteen <tweek@google.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>