Pull x86 fixes from Borislav Petkov:
 "Two more urgent FPU fixes:

   - prevent unprivileged userspace from reinitializing supervisor
     states

   - prepare init_fpstate, which is the buffer used when initializing
     FPU state, properly in case the skip-writing-state-components
     XSAVE* variants are used"

* tag 'x86_urgent_for_v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/fpu: Make init_fpstate correct with optimized XSAVE
  x86/fpu: Preserve supervisor states in sanitize_restored_user_xstate()

Pull ceph fixes from Ilya Dryomov:
 "Two regression fixes from the merge window: one in the auth code
  affecting old clusters and one in the filesystem for proper
  propagation of MDS request errors.

  Also included a locking fix for async creates, marked for stable"

* tag 'ceph-for-5.13-rc8' of https://github.com/ceph/ceph-client:
  libceph: set global_id as soon as we get an auth ticket
  libceph: don't pass result into ac->ops->handle_reply()
  ceph: fix error handling in ceph_atomic_open and ceph_lookup
  ceph: must hold snap_rwsem when filling inode for async create

Pull netfs fixes from David Howells:
 "This contains patches to fix netfs_write_begin() and afs_write_end()
  in the following ways:

  (1) In netfs_write_begin(), extract the decision about whether to skip
      a page out to its own helper and have that clear around the region
      to be written, but not clear that region. This requires the
      filesystem to patch it up afterwards if the hole doesn't get
      completely filled.

  (2) Use offset_in_thp() in (1) rather than manually calculating the
      offset into the page.

  (3) Due to (1), afs_write_end() now needs to handle short data write
      into the page by generic_perform_write(). I've adopted an
      analogous approach to ceph of just returning 0 in this case and
      letting the caller go round again.

  It also adds a note that (in the future) the len parameter may extend
  beyond the page allocated. This is because the page allocation is
  deferred to write_begin() and that gets to decide what size of THP to
  allocate."

Jeff Layton points out:
 "The netfs fix in particular fixes a data corruption bug in cephfs"

* tag 'netfs-fixes-20210621' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  netfs: fix test for whether we can skip read when writing beyond EOF
  afs: Fix afs_write_end() to handle short writes

Pull gpio fixes from Bartosz Golaszewski:

 - fix wake-up interrupt support on gpio-mxc

 - zero the padding bytes in a structure passed to user-space in the
   GPIO character device

 - require HAS_IOPORT_MAP in two drivers that need it to fix a Kbuild
   issue

* tag 'gpio-fixes-for-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
  gpio: AMD8111 and TQMX86 require HAS_IOPORT_MAP
  gpiolib: cdev: zero padding during conversion to gpioline_info_changed
  gpio: mxc: Fix disabled interrupt wake-up support

Pull sound fixes from Takashi Iwai:
 "Two small changes have been cherry-picked as a last material for 5.13:
  a coverage after UMN revert action and a stale MAINTAINERS entry fix"

* tag 'sound-5.13-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  MAINTAINERS: remove Timur Tabi from Freescale SOC sound drivers
  ASoC: rt5645: Avoid upgrading static warnings to errors

Both of these drivers use ioport_map(), so they need to
depend on HAS_IOPORT_MAP. Otherwise, they cannot be built
even with COMPILE_TEST on architectures without an ioport
implementation, such as ARCH=um.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Pull drm fixes from Dave Airlie:
 "This is a bit bigger than I'd like at this stage, and I guess last
  week was extra quiet, but it's mostly one fix across three drivers to
  wait for buffer move pinning to complete.

  There was one locking change that got reverted so it's just noise.

  Otherwise the amdgpu/nouveau changes are for known regressions, and
  otherwise it's just misc changes in kmb/atmel/vc4 drivers.

  Summary:

  core:
   - auth locking change + brown paper bag revert

  radeon/nouveau/amdgpu/ttm:
   - wait for BO to be pinned after moving it (same fix in three
     drivers)

  amdgpu:
   - Revert GFX9/10 doorbell fixes, we just end up trading one bug for
     another
   - Potential memory corruption fix in framebuffer handling

  nouveau:
   - fix regression checking dma addresses

  kmb:
   - error return fix

  atmel-hlcdc:
   - fix kernel warnings at boot
   - enable async flips

  vc4:
   - fix CPU hang due to power management"

* tag 'drm-fixes-2021-06-25' of git://anongit.freedesktop.org/drm/drm:
  drm/nouveau: fix dma_address check for CPU/GPU sync
  drm/kmb: Fix error return code in kmb_hw_init()
  drm/amdgpu: wait for moving fence after pinning
  drm/radeon: wait for moving fence after pinning
  drm/nouveau: wait for moving fence after pinning v2
  Revert "drm: add a locked version of drm_is_current_master"
  Revert "drm/amdgpu/gfx9: fix the doorbell missing when in CGPG issue."
  Revert "drm/amdgpu/gfx10: enlarge CP_MEC_DOORBELL_RANGE_UPPER to cover full doorbell."
  drm/amdgpu: Call drm_framebuffer_init last for framebuffer init
  drm: add a locked version of drm_is_current_master
  drm/atmel-hlcdc: Allow async page flips
  drm/panel: ld9040: reference spi_device_id table
  drm: atmel_hlcdc: Enable the crtc vblank prior to crtc usage.
  drm/vc4: hdmi: Make sure the controller is powered in detect
  drm/vc4: hdmi: Move the HSM clock enable to runtime_pm

A DMA address check for nouveau, an error code return fix for kmb, fixes
to wait for a moving fence after pinning the BO for amdgpu, nouveau and
radeon, a crtc and async page flip fix for atmel-hlcdc and a cpu hang
fix for vc4.
Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210624190353.wyizoil3wqrrxz5d@gilmour

Commit 61ca49a9 ("libceph: don't set global_id until we get an
auth ticket") delayed the setting of global_id too much.  It is set
only after all tickets are received, but in pre-nautilus clusters an
auth ticket and the service tickets are obtained in separate steps
(for a total of three MAuth replies).  When the service tickets are
requested, global_id is used to build an authorizer; if global_id is
still 0 we never get them and fail to establish the session.

Moving the setting of global_id into protocol implementations.  This
way global_id can be set exactly when an auth ticket is received, not
sooner nor later.

Fixes: 61ca49a9 ("libceph: don't set global_id until we get an auth ticket")
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>

There is no result to pass in msgr2 case because authentication
failures are reported through auth_bad_method frame and in MAuth
case an error is returned immediately.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>

Pull MMC fix from Ulf Hansson:
 "Use memcpy_to/fromio for dram-access-quirk in the meson-gx host
  driver"

* tag 'mmc-v5.13-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
  mmc: meson-gx: use memcpy_to/fromio for dram-access-quirk

Pull sigqueue cache fix from Ingo Molnar:
 "Fix a memory leak in the recently introduced sigqueue cache"

* tag 'core-urgent-2021-06-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  signal: Prevent sigqueue caching after task got released

Pull scheduler fix from Ingo Molnar:
 "A last minute cgroup bandwidth scheduling fix for a recently
  introduced logic fail which triggered a kernel warning by LTP's
  cfs_bandwidth01 test"

* tag 'sched-urgent-2021-06-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/fair: Ensure that the CFS parent is added after unthrottling

Pull x86 perf fix from Ingo Molnar:
 "An LBR buffer fix for code that probably only worked accidentally"

* tag 'perf-urgent-2021-06-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel/lbr: Zero the xstate buffer on allocation

Pull objtool fixes from Ingo Molnar:
 "Address a number of objtool warnings that got reported.

  No change in behavior intended, but code generation might be impacted
  by commit 1f008d46 ("x86: Always inline task_size_max()")"

* tag 'objtool-urgent-2021-06-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  locking/lockdep: Improve noinstr vs errors
  x86: Always inline task_size_max()
  x86/xen: Fix noinstr fail in exc_xen_unknown_trap()
  x86/xen: Fix noinstr fail in xen_pv_evtchn_do_upcall()
  x86/entry: Fix noinstr fail in __do_fast_syscall_32()
  objtool/x86: Ignore __x86_indirect_alt_* symbols

AGP for example doesn't have a dma_address array.
Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210614110517.1624-1-christian.koenig@amd.com

I haven't touched these drivers in seven years, and none of the
patches sent to me these days affect code that I wrote.  The
other maintainers are doing a very good job without me.
Signed-off-by: Timur Tabi <timur@kernel.org>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20210620160135.28651-1-timur@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 50b1ce61)
Signed-off-by: Takashi Iwai <tiwai@suse.de>

One of the fixes reverted as part of the UMN fallout was actually fine,
however rather than undoing the revert the process that handled all this
stuff resulted in a patch which attempted to add extra error checks
instead.  Unfortunately this new change wasn't really based on a good
understanding of the subsystem APIs and bypassed the usual patch flow
without ensuring it was reviewed by people with subsystem knowledge and
was merged as a fix rather than during the merge window.

The effect of the new fix is to upgrade what were previously warnings on
static data in the code to hard errors on that data.  If this actually
happens then it would break existing systems, if it doesn't happen then
the change has no effect so this was not a safe change to apply as a fix
to the release candidates.  Since the new code has not been tested and
doesn't in practice improve error handling revert it instead, and also
drop the original revert since the original fix was fine.  This takes
the driver back to what it was in -rc1.

Fixes: 5e70b8e2 ("ASoC: rt5645: add error checking to rt5645_probe function")
Fixes: 1e0ce842 ("Revert "ASoC: rt5645: fix a NULL pointer dereference")
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Phillip Potter <phil@philpotter.co.uk>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20210608160713.21040-1-broonie@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 916cccb5)
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Merge tag 'amd-drm-fixes-5.13-2021-06-21' of https://gitlab.freedesktop.org/agd5f/linux into drm-fixes

amd-drm-fixes-5.13-2021-06-21:

amdgpu:
- Revert GFX9, 10 doorbell fixes, we just
  end up trading one bug for another
- Potential memory corruption fix in framebuffer handling
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210621214132.4004-1-alexander.deucher@amd.com

XRSTORS requires a valid xstate buffer to work correctly. XSAVES does not
guarantee to write a fully valid buffer according to the SDM:

  "XSAVES does not write to any parts of the XSAVE header other than the
   XSTATE_BV and XCOMP_BV fields."

XRSTORS triggers a #GP:

  "If bytes 63:16 of the XSAVE header are not all zero."

It's dubious at best how this can work at all when the buffer is not zeroed
before use.

Allocate the buffers with __GFP_ZERO to prevent XRSTORS failure.

Fixes: ce711ea3 ("perf/x86/intel/lbr: Support XSAVES/XRSTORS for LBR context switch")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/87wnr0wo2z.ffs@nanos.tec.linutronix.de

Pull spi fixes from Mark Brown:
 "A couple of small, driver specific fixes that arrived in the past few
  weeks"

* tag 'spi-fix-v5.13-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi: spi-nxp-fspi: move the register operation after the clock enable
  spi: tegra20-slink: Ensure SPI controller reset is deasserted

Pull power management fix from Rafael Wysocki:
 "Revert a recent PCI power management commit that causes initialization
  issues to appear on some systems"

* tag 'pm-5.13-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  Revert "PCI: PM: Do not read power state in pci_enable_device_flags()"

Merge branch 'stable/for-linus-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb

Pull swiotlb fix from Konrad Rzeszutek Wilk:
 "A fix for the regression for the DMA operations where the offset was
  ignored and corruptions would appear.

  Going forward there will be a cleanups to make the offset and
  alignment logic more clearer and better test-cases to help with this"

* 'stable/for-linus-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb:
  swiotlb: manipulate orig_addr when tlb_addr has offset

Irrespective as to whether CONFIG_MODULE_SIG is configured, specifying
"module.sig_enforce=1" on the boot command line sets "sig_enforce".
Only allow "sig_enforce" to be set when CONFIG_MODULE_SIG is configured.

This patch makes the presence of /sys/module/module/parameters/sig_enforce
dependent on CONFIG_MODULE_SIG=y.

Fixes: fda784e5 ("module: export module signature enforcement status")
Reported-by: Nayna Jain <nayna@linux.ibm.com>
Tested-by: Mimi Zohar <zohar@linux.ibm.com>
Tested-by: Jessica Yu <jeyu@kernel.org>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Jessica Yu <jeyu@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

When the call to platform_get_irq() to obtain the IRQ of the lcd fails, the
returned error code should be propagated. However, we currently do not
explicitly assign this error code to 'ret'. As a result, 0 was incorrectly
returned.

Fixes: 7f7b96a8 ("drm/kmb: Add support for KeemBay Display")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Anitha Chrisanthus <anitha.chrisanthus@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210513134639.6541-1-thunder.leizhen@huawei.com

Revert commit 4514d991 ("PCI: PM: Do not read power state in
pci_enable_device_flags()") that is reported to cause PCI device
initialization issues on some systems.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=213481
Link: https://lore.kernel.org/linux-acpi/YNDoGICcg0V8HhpQ@eldamar.lanReported-by: Michael <phyre@rogers.com>
Reported-by: Salvatore Bonaccorso <carnil@debian.org>
Fixes: 4514d991 ("PCI: PM: Do not read power state in pci_enable_device_flags()")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

syzbot reported a memory leak related to sigqueue caching.

The assumption that a task cannot cache a sigqueue after the signal handler
has been dropped and exit_task_sigqueue_cache() has been invoked turns out
to be wrong.

Such a task can still invoke release_task(other_task), which cleans up the
signals of 'other_task' and ends up in sigqueue_cache_or_free(), which in
turn will cache the signal because task->sigqueue_cache is NULL. That's
obviously bogus because nothing will free the cached signal of that task
anymore, so the cached item is leaked.

This happens when e.g. the last non-leader thread exits and reaps the
zombie leader.

Prevent this by setting tsk::sigqueue_cache to an error pointer value in
exit_task_sigqueue_cache() which forces any subsequent invocation of
sigqueue_cache_or_free() from that task to hand the sigqueue back to the
kmemcache.

Add comments to all relevant places.

Fixes: 4bad58eb ("signal: Allow tasks to cache one sigqueue struct")
Reported-by: syzbot+0bac5fec63d4f399ba98@syzkaller.appspotmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/878s32g6j5.ffs@nanos.tec.linutronix.de

We actually need to wait for the moving fence after pinning
the BO to make sure that the pin is completed.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
References: https://lore.kernel.org/dri-devel/20210621151758.2347474-1-daniel.vetter@ffwll.ch/
CC: stable@kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20210622114506.106349-3-christian.koenig@amd.com

We actually need to wait for the moving fence after pinning
the BO to make sure that the pin is completed.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
References: https://lore.kernel.org/dri-devel/20210621151758.2347474-1-daniel.vetter@ffwll.ch/
CC: stable@kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20210622114506.106349-2-christian.koenig@amd.com

We actually need to wait for the moving fence after pinning
the BO to make sure that the pin is completed.

v2: grab the lock while waiting
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
References: https://lore.kernel.org/dri-devel/20210621151758.2347474-1-daniel.vetter@ffwll.ch/
CC: stable@kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20210622114506.106349-1-christian.koenig@amd.com

Ensure that a CFS parent will be in the list whenever one of its children is also
in the list.

A warning on rq->tmp_alone_branch != &rq->leaf_cfs_rq_list has been
reported while running LTP test cfs_bandwidth01.

Odin Ugedal found the root cause:

	$ tree /sys/fs/cgroup/ltp/ -d --charset=ascii
	/sys/fs/cgroup/ltp/
	|-- drain
	`-- test-6851
	    `-- level2
		|-- level3a
		|   |-- worker1
		|   `-- worker2
		`-- level3b
		    `-- worker3

Timeline (ish):
- worker3 gets throttled
- level3b is decayed, since it has no more load
- level2 get throttled
- worker3 get unthrottled
- level2 get unthrottled
  - worker3 is added to list
  - level3b is not added to list, since nr_running==0 and is decayed

 [ Vincent Guittot: Rebased and updated to fix for the reported warning. ]

Fixes: a7b359fc ("sched/fair: Correctly insert cfs_rq's to list on unthrottle")
Reported-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Suggested-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Rik van Riel <riel@surriel.com>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Acked-by: Odin Ugedal <odin@uged.al>
Link: https://lore.kernel.org/r/20210621174330.11258-1-vincent.guittot@linaro.org

Better handle the failure paths.

  vmlinux.o: warning: objtool: debug_locks_off()+0x23: call to console_verbose() leaves .noinstr.text section
  vmlinux.o: warning: objtool: debug_locks_off()+0x19: call to __kasan_check_write() leaves .noinstr.text section

  debug_locks_off+0x19/0x40:
  instrument_atomic_write at include/linux/instrumented.h:86
  (inlined by) __debug_locks_off at include/linux/debug_locks.h:17
  (inlined by) debug_locks_off at lib/debug_locks.c:41

Fixes: 6eebad1a ("lockdep: __always_inline more for noinstr")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210621120120.784404944@infradead.org

Fix:

  vmlinux.o: warning: objtool: handle_bug()+0x10: call to task_size_max() leaves .noinstr.text section

When #UD isn't a BUG, we shouldn't violate noinstr (we'll still
probably die, but that's another story).

Fixes: 025768a9 ("x86/cpu: Use alternative to generate the TASK_SIZE_MAX constant")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210621120120.682468274@infradead.org

Fix:

  vmlinux.o: warning: objtool: exc_xen_unknown_trap()+0x7: call to printk() leaves .noinstr.text section

Fixes: 2e924936 ("x86/xen: avoid warning in Xen pv guest with CONFIG_AMD_MEM_ENCRYPT enabled")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210621120120.606560778@infradead.org

Fix:

  vmlinux.o: warning: objtool: xen_pv_evtchn_do_upcall()+0x23: call to irq_enter_rcu() leaves .noinstr.text section

Fixes: 359f01d1 ("x86/entry: Use run_sysvec_on_irqstack_cond() for XEN upcall")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210621120120.532960208@infradead.org

Fix:

  vmlinux.o: warning: objtool: __do_fast_syscall_32()+0xf5: call to trace_hardirqs_off() leaves .noinstr.text section

Fixes: 5d5675df ("x86/entry: Fix entry/exit mismatch on failed fast 32-bit syscalls")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210621120120.467898710@infradead.org

Commit aa60cfc3 broke the error handling in these functions such
that they don't handle non-ENOENT errors from ceph_mdsc_do_request
properly.

Move the checking of -ENOENT out of ceph_handle_snapdir and into the
callers, and if we get a different error, return it immediately.

Fixes: aa60cfc3 ("ceph: don't use d_add in ceph_handle_snapdir")
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

...and add a lockdep assertion for it to ceph_fill_inode().

Cc: stable@vger.kernel.org # v5.7+
Fixes: 9a8d03ca ("ceph: attempt to do async create when possible")
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

The XSAVE init code initializes all enabled and supported components with
XRSTOR(S) to init state. Then it XSAVEs the state of the components back
into init_fpstate which is used in several places to fill in the init state
of components.

This works correctly with XSAVE, but not with XSAVEOPT and XSAVES because
those use the init optimization and skip writing state of components which
are in init state. So init_fpstate.xsave still contains all zeroes after
this operation.

There are two ways to solve that:

   1) Use XSAVE unconditionally, but that requires to reshuffle the buffer when
      XSAVES is enabled because XSAVES uses compacted format.

   2) Save the components which are known to have a non-zero init state by other
      means.

Looking deeper, #2 is the right thing to do because all components the
kernel supports have all-zeroes init state except the legacy features (FP,
SSE). Those cannot be hard coded because the states are not identical on all
CPUs, but they can be saved with FXSAVE which avoids all conditionals.

Use FXSAVE to save the legacy FP/SSE components in init_fpstate along with
a BUILD_BUG_ON() which reminds developers to validate that a newly added
component has all zeroes init state. As a bonus remove the now unused
copy_xregs_to_kernel_booting() crutch.

The XSAVE and reshuffle method can still be implemented in the unlikely
case that components are added which have a non-zero init state and no
other means to save them. For now, FXSAVE is just simple and good enough.

  [ bp: Fix a typo or two in the text. ]

Fixes: 6bad06b7 ("x86, xsave: Use xsaveopt in context-switch path when supported")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20210618143444.587311343@linutronix.de

sanitize_restored_user_xstate() preserves the supervisor states only
when the fx_only argument is zero, which allows unprivileged user space
to put supervisor states back into init state.

Preserve them unconditionally.

 [ bp: Fix a typo or two in the text. ]

Fixes: 5d6b6a6f ("x86/fpu/xstate: Update sanitize_restored_xstate() for supervisor xstates")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20210618143444.438635017@linutronix.de