linux-2.6-microblaze.git
3 years agoMerge tag 'icc-5.12-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/djakov...
Greg Kroah-Hartman [Sat, 27 Mar 2021 11:39:18 +0000 (12:39 +0100)]
Merge tag 'icc-5.12-rc5' of git://git./linux/kernel/git/djakov/icc into char-misc-linus

Georgi writes:

interconnect fixes for v5.12

This contains a few tiny drivers and core fixes that have been
reported during this cycle.

- msm8939: Remove rpm-ids from non-RPM nodes
- core: Fix error return code of icc_link_destroy()
- core: Fix kerneldoc warning

Signed-off-by: Georgi Djakov <djakov@kernel.org>
* tag 'icc-5.12-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/djakov/icc:
  interconnect: Fix kerneldoc warning
  interconnect: core: fix error return code of icc_link_destroy()
  interconnect: qcom: msm8939: remove rpm-ids from non-RPM nodes

3 years agoMerge tag 'fpga-fixes-for-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git...
Greg Kroah-Hartman [Sat, 27 Mar 2021 11:38:19 +0000 (12:38 +0100)]
Merge tag 'fpga-fixes-for-5.12' of git://git./linux/kernel/git/mdf/linux-fpga into char-misc-linus

Moritz writes:

FPGA Manager fixes for 5.12

Richard's fix addresses an errornously flipped flag.

All patches have been reviewed on the mailing list, and have been in the
last few linux-next releases (as part of my fixes branch) without issues.

Signed-off-by: Moritz Fischer <mdf@kernel.org>
* tag 'fpga-fixes-for-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/mdf/linux-fpga:
  firmware: stratix10-svc: reset COMMAND_RECONFIG_FLAG_PARTIAL to 0

3 years agodrivers: video: fbcon: fix NULL dereference in fbcon_cursor()
Du Cheng [Fri, 12 Mar 2021 08:14:21 +0000 (16:14 +0800)]
drivers: video: fbcon: fix NULL dereference in fbcon_cursor()

add null-check on function pointer before dereference on ops->cursor

Reported-by: syzbot+b67aaae8d3a927f68d20@syzkaller.appspotmail.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Du Cheng <ducheng2@gmail.com>
Link: https://lore.kernel.org/r/20210312081421.452405-1-ducheng2@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agomei: allow map and unmap of client dma buffer only for disconnected client
Tomas Winkler [Thu, 18 Mar 2021 05:59:59 +0000 (07:59 +0200)]
mei: allow map and unmap of client dma buffer only for disconnected client

Allow map and unmap of the client dma buffer only when the client is not
connected. The functions return -EPROTO if the client is already connected.
This is to fix the race when traffic may start or stop when buffer
is not available.

Cc: <stable@vger.kernel.org> #v5.11+
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20210318055959.305627-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agoMAINTAINERS: Add linux-phy list and patchwork
Vinod Koul [Fri, 26 Feb 2021 11:12:33 +0000 (16:42 +0530)]
MAINTAINERS: Add linux-phy list and patchwork

Linux-phy subsystem gained mailing list and a patchwork instance. Add the
details to MAINTAINERS file

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20210226111233.2601369-1-vkoul@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agointerconnect: Fix kerneldoc warning
Georgi Djakov [Thu, 18 Mar 2021 16:34:15 +0000 (18:34 +0200)]
interconnect: Fix kerneldoc warning

Fix the following warning:
drivers/interconnect/bulk.c:63: warning: expecting prototype for
icc_bulk_set(). Prototype was for icc_bulk_set_bw() instead

Link: https://lore.kernel.org/r/20210318163415.30941-1-georgi.djakov@linaro.org
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
3 years agofirmware: stratix10-svc: reset COMMAND_RECONFIG_FLAG_PARTIAL to 0
Richard Gong [Tue, 9 Feb 2021 22:20:27 +0000 (16:20 -0600)]
firmware: stratix10-svc: reset COMMAND_RECONFIG_FLAG_PARTIAL to 0

Clean up COMMAND_RECONFIG_FLAG_PARTIAL flag by resetting it to 0, which
aligns with the firmware settings.

Fixes: 36847f9e3e56 ("firmware: stratix10-svc: correct reconfig flag and timeout values")
Signed-off-by: Richard Gong <richard.gong@intel.com>
Reviewed-by: Tom Rix <trix@redhat.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
3 years agoMerge tag 'extcon-fixes-for-5.12-rc4' of git://git.kernel.org/pub/scm/linux/kernel...
Greg Kroah-Hartman [Mon, 15 Mar 2021 08:36:55 +0000 (09:36 +0100)]
Merge tag 'extcon-fixes-for-5.12-rc4' of git://git./linux/kernel/git/chanwoo/extcon into char-misc-next

Chanwoo writes:

Update extcon for v5.12-rc4

Detailed update of this pull request as following:
1. Add stubs of extcon_register_notifier_all() function for when
CONFIG_EXTCON is disabled.

2. Fix exception handling in extcon_dev_register() when failed to
initialize the extcon device.

* tag 'extcon-fixes-for-5.12-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon:
  extcon: Fix error handling in extcon_dev_register
  extcon: Add stubs for extcon_register_notifier_all() functions

3 years agoextcon: Fix error handling in extcon_dev_register
Dinghao Liu [Tue, 19 Jan 2021 08:10:55 +0000 (16:10 +0800)]
extcon: Fix error handling in extcon_dev_register

When devm_kcalloc() fails, we should execute device_unregister()
to unregister edev->dev from system.

Fixes: 046050f6e623e ("extcon: Update the prototype of extcon_register_notifier() with enum extcon")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
3 years agoextcon: Add stubs for extcon_register_notifier_all() functions
Krzysztof Kozlowski [Thu, 31 Dec 2020 08:52:52 +0000 (09:52 +0100)]
extcon: Add stubs for extcon_register_notifier_all() functions

Add stubs for extcon_register_notifier_all() function for !CONFIG_EXTCON
case.  This is useful for compile testing and for drivers which use
EXTCON but do not require it (therefore do not depend on CONFIG_EXTCON).

Fixes: 815429b39d94 ("extcon: Add new extcon_register_notifier_all() to monitor all external connectors")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
3 years agoLinux 5.12-rc3
Linus Torvalds [Sun, 14 Mar 2021 21:41:02 +0000 (14:41 -0700)]
Linux 5.12-rc3

3 years agoprctl: fix PR_SET_MM_AUXV kernel stack leak
Alexey Dobriyan [Sun, 14 Mar 2021 20:51:14 +0000 (23:51 +0300)]
prctl: fix PR_SET_MM_AUXV kernel stack leak

Doing a

prctl(PR_SET_MM, PR_SET_MM_AUXV, addr, 1);

will copy 1 byte from userspace to (quite big) on-stack array
and then stash everything to mm->saved_auxv.
AT_NULL terminator will be inserted at the very end.

/proc/*/auxv handler will find that AT_NULL terminator
and copy original stack contents to userspace.

This devious scheme requires CAP_SYS_RESOURCE.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agoMerge tag 'irq-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 14 Mar 2021 20:33:33 +0000 (13:33 -0700)]
Merge tag 'irq-urgent-2021-03-14' of git://git./linux/kernel/git/tip/tip

Pull irq fixes from Thomas Gleixner:
 "A set of irqchip updates:

   - Make the GENERIC_IRQ_MULTI_HANDLER configuration correct

   - Add a missing DT compatible string for the Ingenic driver

   - Remove the pointless debugfs_file pointer from struct irqdomain"

* tag 'irq-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/ingenic: Add support for the JZ4760
  dt-bindings/irq: Add compatible string for the JZ4760B
  irqchip: Do not blindly select CONFIG_GENERIC_IRQ_MULTI_HANDLER
  ARM: ep93xx: Select GENERIC_IRQ_MULTI_HANDLER directly
  irqdomain: Remove debugfs_file from struct irq_domain

3 years agoMerge tag 'timers-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 14 Mar 2021 20:29:38 +0000 (13:29 -0700)]
Merge tag 'timers-urgent-2021-03-14' of git://git./linux/kernel/git/tip/tip

Pull timer fix from Thomas Gleixner:
 "A single fix in for hrtimers to prevent an interrupt storm caused by
  the lack of reevaluation of the timers which expire in softirq context
  under certain circumstances, e.g. when the clock was set"

* tag 'timers-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  hrtimer: Update softirq_expires_next correctly after __hrtimer_get_next_event()

3 years agoMerge tag 'sched-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 14 Mar 2021 20:27:06 +0000 (13:27 -0700)]
Merge tag 'sched-urgent-2021-03-14' of git://git./linux/kernel/git/tip/tip

Pull scheduler fixes from Thomas Gleixner:
 "A set of scheduler updates:

   - Prevent a NULL pointer dereference in the migration_stop_cpu()
     mechanims

   - Prevent self concurrency of affine_move_task()

   - Small fixes and cleanups related to task migration/affinity setting

   - Ensure that sync_runqueues_membarrier_state() is invoked on the
     current CPU when it is in the cpu mask"

* tag 'sched-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/membarrier: fix missing local execution of ipi_sync_rq_state()
  sched: Simplify set_affinity_pending refcounts
  sched: Fix affine_move_task() self-concurrency
  sched: Optimize migration_cpu_stop()
  sched: Collate affine_move_task() stoppers
  sched: Simplify migration_cpu_stop()
  sched: Fix migration_cpu_stop() requeueing

3 years agoMerge tag 'objtool-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 14 Mar 2021 20:15:55 +0000 (13:15 -0700)]
Merge tag 'objtool-urgent-2021-03-14' of git://git./linux/kernel/git/tip/tip

Pull objtool fix from Thomas Gleixner:
 "A single objtool fix to handle the PUSHF/POPF validation correctly for
  the paravirt changes which modified arch_local_irq_restore not to use
  popf"

* tag 'objtool-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  objtool,x86: Fix uaccess PUSHF/POPF validation

3 years agoMerge tag 'locking-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 14 Mar 2021 20:03:21 +0000 (13:03 -0700)]
Merge tag 'locking-urgent-2021-03-14' of git://git./linux/kernel/git/tip/tip

Pull locking fixes from Thomas Gleixner:
 "A couple of locking fixes:

   - A fix for the static_call mechanism so it handles unaligned
     addresses correctly.

   - Make u64_stats_init() a macro so every instance gets a seperate
     lockdep key.

   - Make seqcount_latch_init() a macro as well to preserve the static
     variable which is used for the lockdep key"

* tag 'locking-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  seqlock,lockdep: Fix seqcount_latch_init()
  u64_stats,lockdep: Fix u64_stats_init() vs lockdep
  static_call: Fix the module key fixup

3 years agoMerge tag 'perf_urgent_for_v5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 14 Mar 2021 19:57:17 +0000 (12:57 -0700)]
Merge tag 'perf_urgent_for_v5.12-rc3' of git://git./linux/kernel/git/tip/tip

Pull perf fixes from Borislav Petkov:

 - Make sure PMU internal buffers are flushed for per-CPU events too and
   properly handle PID/TID for large PEBS.

 - Handle the case properly when there's no PMU and therefore return an
   empty list of perf MSRs for VMX to switch instead of reading random
   garbage from the stack.

* tag 'perf_urgent_for_v5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/perf: Use RET0 as default for guest_get_msrs to handle "no PMU" case
  perf/x86/intel: Set PERF_ATTACH_SCHED_CB for large PEBS and LBR
  perf/core: Flush PMU internal buffers for per-CPU events

3 years agoMerge tag 'efi-urgent-for-v5.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 14 Mar 2021 19:54:56 +0000 (12:54 -0700)]
Merge tag 'efi-urgent-for-v5.12-rc2' of git://git./linux/kernel/git/tip/tip

Pull EFI fix from Ard Biesheuvel via Borislav Petkov:
 "Fix an oversight in the handling of EFI_RT_PROPERTIES_TABLE, which was
  added v5.10, but failed to take the SetVirtualAddressMap() RT service
  into account"

* tag 'efi-urgent-for-v5.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi: stub: omit SetVirtualAddressMap() if marked unsupported in RT_PROP table

3 years agoMerge tag 'x86_urgent_for_v5.12_rc3' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 14 Mar 2021 19:48:10 +0000 (12:48 -0700)]
Merge tag 'x86_urgent_for_v5.12_rc3' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Borislav Petkov:

 - A couple of SEV-ES fixes and robustifications: verify usermode stack
   pointer in NMI is not coming from the syscall gap, correctly track
   IRQ states in the #VC handler and access user insn bytes atomically
   in same handler as latter cannot sleep.

 - Balance 32-bit fast syscall exit path to do the proper work on exit
   and thus not confuse audit and ptrace frameworks.

 - Two fixes for the ORC unwinder going "off the rails" into KASAN
   redzones and when ORC data is missing.

* tag 'x86_urgent_for_v5.12_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/sev-es: Use __copy_from_user_inatomic()
  x86/sev-es: Correctly track IRQ states in runtime #VC handler
  x86/sev-es: Check regs->sp is trusted before adjusting #VC IST stack
  x86/sev-es: Introduce ip_within_syscall_gap() helper
  x86/entry: Fix entry/exit mismatch on failed fast 32-bit syscalls
  x86/unwind/orc: Silence warnings caused by missing ORC data
  x86/unwind/orc: Disable KASAN checking in the ORC unwinder, part 2

3 years agoMerge tag 'powerpc-5.12-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
Linus Torvalds [Sun, 14 Mar 2021 19:37:43 +0000 (12:37 -0700)]
Merge tag 'powerpc-5.12-3' of git://git./linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "Some more powerpc fixes for 5.12:

   - Fix wrong instruction encoding for lis in ppc_function_entry(),
     which could potentially lead to missed kprobes.

   - Fix SET_FULL_REGS on 32-bit and 64e, which prevented ptrace of
     non-volatile GPRs immediately after exec.

   - Clean up a missed SRR specifier in the recent interrupt rework.

   - Don't treat unrecoverable_exception() as an interrupt handler, it's
     called from other handlers so shouldn't do the interrupt entry/exit
     accounting itself.

   - Fix build errors caused by missing declarations for
     [en/dis]able_kernel_vsx().

  Thanks to Christophe Leroy, Daniel Axtens, Geert Uytterhoeven, Jiri
  Olsa, Naveen N. Rao, and Nicholas Piggin"

* tag 'powerpc-5.12-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/traps: unrecoverable_exception() is not an interrupt handler
  powerpc: Fix missing declaration of [en/dis]able_kernel_vsx()
  powerpc/64s/exception: Clean up a missed SRR specifier
  powerpc: Fix inverted SET_FULL_REGS bitop
  powerpc/64s: Use symbolic macros for function entry encoding
  powerpc/64s: Fix instruction encoding for lis in ppc_function_entry()

3 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Sun, 14 Mar 2021 19:35:02 +0000 (12:35 -0700)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull KVM fixes from Paolo Bonzini:
 "More fixes for ARM and x86"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: LAPIC: Advancing the timer expiration on guest initiated write
  KVM: x86/mmu: Skip !MMU-present SPTEs when removing SP in exclusive mode
  KVM: kvmclock: Fix vCPUs > 64 can't be online/hotpluged
  kvm: x86: annotate RCU pointers
  KVM: arm64: Fix exclusive limit for IPA size
  KVM: arm64: Reject VM creation when the default IPA size is unsupported
  KVM: arm64: Ensure I-cache isolation between vcpus of a same VM
  KVM: arm64: Don't use cbz/adr with external symbols
  KVM: arm64: Fix range alignment when walking page tables
  KVM: arm64: Workaround firmware wrongly advertising GICv2-on-v3 compatibility
  KVM: arm64: Rename __vgic_v3_get_ich_vtr_el2() to __vgic_v3_get_gic_config()
  KVM: arm64: Don't access PMSELR_EL0/PMUSERENR_EL0 when no PMU is available
  KVM: arm64: Turn kvm_arm_support_pmu_v3() into a static key
  KVM: arm64: Fix nVHE hyp panic host context restore
  KVM: arm64: Avoid corrupting vCPU context register in guest exit
  KVM: arm64: nvhe: Save the SPE context early
  kvm: x86: use NULL instead of using plain integer as pointer
  KVM: SVM: Connect 'npt' module param to KVM's internal 'npt_enabled'
  KVM: x86: Ensure deadline timer has truly expired before posting its IRQ

3 years agoMerge branch 'akpm' (patches from Andrew)
Linus Torvalds [Sun, 14 Mar 2021 19:23:34 +0000 (12:23 -0700)]
Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:
 "28 patches.

  Subsystems affected by this series: mm (memblock, pagealloc, hugetlb,
  highmem, kfence, oom-kill, madvise, kasan, userfaultfd, memcg, and
  zram), core-kernel, kconfig, fork, binfmt, MAINTAINERS, kbuild, and
  ia64"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (28 commits)
  zram: fix broken page writeback
  zram: fix return value on writeback_store
  mm/memcg: set memcg when splitting page
  mm/memcg: rename mem_cgroup_split_huge_fixup to split_page_memcg and add nr_pages argument
  ia64: fix ptrace(PTRACE_SYSCALL_INFO_EXIT) sign
  ia64: fix ia64_syscall_get_set_arguments() for break-based syscalls
  mm/userfaultfd: fix memory corruption due to writeprotect
  kasan: fix KASAN_STACK dependency for HW_TAGS
  kasan, mm: fix crash with HW_TAGS and DEBUG_PAGEALLOC
  mm/madvise: replace ptrace attach requirement for process_madvise
  include/linux/sched/mm.h: use rcu_dereference in in_vfork()
  kfence: fix reports if constant function prefixes exist
  kfence, slab: fix cache_alloc_debugcheck_after() for bulk allocations
  kfence: fix printk format for ptrdiff_t
  linux/compiler-clang.h: define HAVE_BUILTIN_BSWAP*
  MAINTAINERS: exclude uapi directories in API/ABI section
  binfmt_misc: fix possible deadlock in bm_register_write
  mm/highmem.c: fix zero_user_segments() with start > end
  hugetlb: do early cow when page pinned on src mm
  mm: use is_cow_mapping() across tree where proper
  ...

3 years agoMerge tag 'irqchip-fixes-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git...
Thomas Gleixner [Sun, 14 Mar 2021 15:34:35 +0000 (16:34 +0100)]
Merge tag 'irqchip-fixes-5.12-1' of git://git./linux/kernel/git/maz/arm-platforms into irq/urgent

Pull irqchip fixes from Marc Zyngier:

  - More compatible strings for the Ingenic irqchip (introducing the
    JZ4760B SoC)
  - Select GENERIC_IRQ_MULTI_HANDLER on the ARM ep93xx platform
  - Drop all GENERIC_IRQ_MULTI_HANDLER selections from the irqchip
    Kconfig, now relying on the architecture to get it right
  - Drop the debugfs_file field from struct irq_domain, now that
    debugfs can track things on its own

3 years agoMerge tag 'char-misc-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregk...
Linus Torvalds [Sat, 13 Mar 2021 20:38:44 +0000 (12:38 -0800)]
Merge tag 'char-misc-5.12-rc3' of git://git./linux/kernel/git/gregkh/char-misc

Pull char/misc driver fixes from Greg KH:
 "Here are some small misc/char driver fixes to resolve some reported
  problems:

   - habanalabs driver fixes

   - Acrn build fixes (reported many times)

   - pvpanic module table export fix

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'char-misc-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  misc/pvpanic: Export module FDT device table
  misc: fastrpc: restrict user apps from sending kernel RPC messages
  virt: acrn: Correct type casting of argument of copy_from_user()
  virt: acrn: Use EPOLLIN instead of POLLIN
  virt: acrn: Use vfs_poll() instead of f_op->poll()
  virt: acrn: Make remove_cpu sysfs invisible with !CONFIG_HOTPLUG_CPU
  cpu/hotplug: Fix build error of using {add,remove}_cpu() with !CONFIG_SMP
  habanalabs: fix debugfs address translation
  habanalabs: Disable file operations after device is removed
  habanalabs: Call put_pid() when releasing control device
  drivers: habanalabs: remove unused dentry pointer for debugfs files
  habanalabs: mark hl_eq_inc_ptr() as static

3 years agoMerge tag 'staging-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Sat, 13 Mar 2021 20:36:53 +0000 (12:36 -0800)]
Merge tag 'staging-5.12-rc3' of git://git./linux/kernel/git/gregkh/staging

Pull staging driver fixes from Greg KH:
 "Here are some small staging driver fixes for reported problems. They
  include:

   - wfx header file cleanup patch reverted as it could cause problems

   - comedi driver endian fixes

   - buffer overflow problems for staging wifi drivers

   - build dependency issue for rtl8192e driver

  All have been in linux-next for a while with no reported problems"

* tag 'staging-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (23 commits)
  Revert "staging: wfx: remove unused included header files"
  staging: rtl8188eu: prevent ->ssid overflow in rtw_wx_set_scan()
  staging: rtl8188eu: fix potential memory corruption in rtw_check_beacon_data()
  staging: rtl8192u: fix ->ssid overflow in r8192_wx_set_scan()
  staging: comedi: pcl726: Use 16-bit 0 for interrupt data
  staging: comedi: ni_65xx: Use 16-bit 0 for interrupt data
  staging: comedi: ni_6527: Use 16-bit 0 for interrupt data
  staging: comedi: comedi_parport: Use 16-bit 0 for interrupt data
  staging: comedi: amplc_pc236_common: Use 16-bit 0 for interrupt data
  staging: comedi: pcl818: Fix endian problem for AI command data
  staging: comedi: pcl711: Fix endian problem for AI command data
  staging: comedi: me4000: Fix endian problem for AI command data
  staging: comedi: dmm32at: Fix endian problem for AI command data
  staging: comedi: das800: Fix endian problem for AI command data
  staging: comedi: das6402: Fix endian problem for AI command data
  staging: comedi: adv_pci1710: Fix endian problem for AI command data
  staging: comedi: addi_apci_1500: Fix endian problem for command sample
  staging: comedi: addi_apci_1032: Fix endian problem for COS sample
  staging: ks7010: prevent buffer overflow in ks_wlan_set_scan()
  staging: rtl8712: Fix possible buffer overflow in r8712_sitesurvey_cmd
  ...

3 years agoMerge tag 'tty-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Linus Torvalds [Sat, 13 Mar 2021 20:34:29 +0000 (12:34 -0800)]
Merge tag 'tty-5.12-rc3' of git://git./linux/kernel/git/gregkh/tty

Pull tty/serial fixes from Greg KH:
 "Here are some small tty and serial driver fixes to resolve some
  reported problems:

   - led tty trigger fixes based on review and were acked by the led
     maintainer

   - revert a max310x serial driver patch as it was causing problems

   - revert a pty change as it was also causing problems

  All of these have been in linux-next for a while with no reported
  problems"

* tag 'tty-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  Revert "drivers:tty:pty: Fix a race causing data loss on close"
  Revert "serial: max310x: rework RX interrupt handling"
  leds: trigger/tty: Use led_set_brightness_sync() from workqueue
  leds: trigger: Fix error path to not unlock the unlocked mutex

3 years agoMerge tag 'usb-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Linus Torvalds [Sat, 13 Mar 2021 20:32:57 +0000 (12:32 -0800)]
Merge tag 'usb-5.12-rc3' of git://git./linux/kernel/git/gregkh/usb

Pull USB fixes from Greg KH:
 "Here are a small number of USB fixes for 5.12-rc3 to resolve a bunch
  of reported issues:

   - usbip fixups for issues found by syzbot

   - xhci driver fixes and quirk additions

   - gadget driver fixes

   - dwc3 QCOM driver fix

   - usb-serial new ids and fixes

   - usblp fix for a long-time issue

   - cdc-acm quirk addition

   - other tiny fixes for reported problems

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'usb-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (25 commits)
  xhci: Fix repeated xhci wake after suspend due to uncleared internal wake state
  usb: xhci: Fix ASMedia ASM1042A and ASM3242 DMA addressing
  xhci: Improve detection of device initiated wake signal.
  usb: xhci: do not perform Soft Retry for some xHCI hosts
  usbip: fix vudc usbip_sockfd_store races leading to gpf
  usbip: fix vhci_hcd attach_store() races leading to gpf
  usbip: fix stub_dev usbip_sockfd_store() races leading to gpf
  usbip: fix vudc to check for stream socket
  usbip: fix vhci_hcd to check for stream socket
  usbip: fix stub_dev to check for stream socket
  usb: dwc3: qcom: Add missing DWC3 OF node refcount decrement
  USB: usblp: fix a hang in poll() if disconnected
  USB: gadget: udc: s3c2410_udc: fix return value check in s3c2410_udc_probe()
  usb: renesas_usbhs: Clear PIPECFG for re-enabling pipe with other EPNUM
  usb: dwc3: qcom: Honor wakeup enabled/disabled state
  usb: gadget: f_uac1: stop playback on function disable
  usb: gadget: f_uac2: always increase endpoint max_packet_size by one audio slot
  USB: gadget: u_ether: Fix a configfs return code
  usb: dwc3: qcom: add ACPI device id for sc8180x
  Goodix Fingerprint device is not a modem
  ...

3 years agoMerge tag 'erofs-for-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang...
Linus Torvalds [Sat, 13 Mar 2021 20:26:22 +0000 (12:26 -0800)]
Merge tag 'erofs-for-5.12-rc3' of git://git./linux/kernel/git/xiang/erofs

Pull erofs fix from Gao Xiang:
 "Fix an urgent regression introduced by commit baa2c7c97153 ("block:
  set .bi_max_vecs as actual allocated vector number"), which could
  cause unexpected hung since linux 5.12-rc1.

  Resolve it by avoiding using bio->bi_max_vecs completely"

* tag 'erofs-for-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
  erofs: fix bio->bi_max_vecs behavior change

3 years agoMerge tag 'kbuild-fixes-v5.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 13 Mar 2021 20:18:59 +0000 (12:18 -0800)]
Merge tag 'kbuild-fixes-v5.12-2' of git://git./linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - avoid 'make image_name' invoking syncconfig

 - fix a couple of bugs in scripts/dummy-tools

 - fix LLD_VENDOR and locale issues in scripts/ld-version.sh

 - rebuild GCC plugins when the compiler is upgraded

 - allow LTO to be enabled with KASAN_HW_TAGS

 - allow LTO to be enabled without LLVM=1

* tag 'kbuild-fixes-v5.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kbuild: fix ld-version.sh to not be affected by locale
  kbuild: remove meaningless parameter to $(call if_changed_rule,dtc)
  kbuild: remove LLVM=1 test from HAS_LTO_CLANG
  kbuild: remove unneeded -O option to dtc
  kbuild: dummy-tools: adjust to scripts/cc-version.sh
  kbuild: Allow LTO to be selected with KASAN_HW_TAGS
  kbuild: dummy-tools: support MPROFILE_KERNEL checks for ppc
  kbuild: rebuild GCC plugins when the compiler is upgraded
  kbuild: Fix ld-version.sh script if LLD was built with LLD_VENDOR
  kbuild: dummy-tools: fix inverted tests for gcc
  kbuild: add image_name to no-sync-config-targets

3 years agozram: fix broken page writeback
Minchan Kim [Sat, 13 Mar 2021 05:08:41 +0000 (21:08 -0800)]
zram: fix broken page writeback

commit 0d8359620d9b ("zram: support page writeback") introduced two
problems.  It overwrites writeback_store's return value as kstrtol's
return value, which makes return value zero so user could see zero as
return value of write syscall even though it wrote data successfully.

It also breaks index value in the loop in that it doesn't increase the
index any longer.  It means it can write only first starting block index
so user couldn't write all idle pages in the zram so lose memory saving
chance.

This patch fixes those issues.

Link: https://lkml.kernel.org/r/20210312173949.2197662-2-minchan@kernel.org
Fixes: 0d8359620d9b("zram: support page writeback")
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reported-by: Amos Bianchi <amosbianchi@google.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: John Dias <joaodias@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agozram: fix return value on writeback_store
Minchan Kim [Sat, 13 Mar 2021 05:08:38 +0000 (21:08 -0800)]
zram: fix return value on writeback_store

writeback_store's return value is overwritten by submit_bio_wait's return
value.  Thus, writeback_store will return zero since there was no IO
error.  In the end, write syscall from userspace will see the zero as
return value, which could make the process stall to keep trying the write
until it will succeed.

Link: https://lkml.kernel.org/r/20210312173949.2197662-1-minchan@kernel.org
Fixes: 3b82a051c101("drivers/block/zram/zram_drv.c: fix error return codes not being returned in writeback_store")
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: John Dias <joaodias@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agomm/memcg: set memcg when splitting page
Zhou Guanghui [Sat, 13 Mar 2021 05:08:33 +0000 (21:08 -0800)]
mm/memcg: set memcg when splitting page

As described in the split_page() comment, for the non-compound high order
page, the sub-pages must be freed individually.  If the memcg of the first
page is valid, the tail pages cannot be uncharged when be freed.

For example, when alloc_pages_exact is used to allocate 1MB continuous
physical memory, 2MB is charged(kmemcg is enabled and __GFP_ACCOUNT is
set).  When make_alloc_exact free the unused 1MB and free_pages_exact free
the applied 1MB, actually, only 4KB(one page) is uncharged.

Therefore, the memcg of the tail page needs to be set when splitting a
page.

Michel:

There are at least two explicit users of __GFP_ACCOUNT with
alloc_exact_pages added recently.  See 7efe8ef274024 ("KVM: arm64:
Allocate stage-2 pgd pages with GFP_KERNEL_ACCOUNT") and c419621873713
("KVM: s390: Add memcg accounting to KVM allocations"), so this is not
just a theoretical issue.

Link: https://lkml.kernel.org/r/20210304074053.65527-3-zhouguanghui1@huawei.com
Signed-off-by: Zhou Guanghui <zhouguanghui1@huawei.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Hanjun Guo <guohanjun@huawei.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Rui Xiang <rui.xiang@huawei.com>
Cc: Tianhong Ding <dingtianhong@huawei.com>
Cc: Weilong Chen <chenweilong@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agomm/memcg: rename mem_cgroup_split_huge_fixup to split_page_memcg and add nr_pages...
Zhou Guanghui [Sat, 13 Mar 2021 05:08:30 +0000 (21:08 -0800)]
mm/memcg: rename mem_cgroup_split_huge_fixup to split_page_memcg and add nr_pages argument

Rename mem_cgroup_split_huge_fixup to split_page_memcg and explicitly pass
in page number argument.

In this way, the interface name is more common and can be used by
potential users.  In addition, the complete info(memcg and flag) of the
memcg needs to be set to the tail pages.

Link: https://lkml.kernel.org/r/20210304074053.65527-2-zhouguanghui1@huawei.com
Signed-off-by: Zhou Guanghui <zhouguanghui1@huawei.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Hanjun Guo <guohanjun@huawei.com>
Cc: Tianhong Ding <dingtianhong@huawei.com>
Cc: Weilong Chen <chenweilong@huawei.com>
Cc: Rui Xiang <rui.xiang@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agoia64: fix ptrace(PTRACE_SYSCALL_INFO_EXIT) sign
Sergei Trofimovich [Sat, 13 Mar 2021 05:08:27 +0000 (21:08 -0800)]
ia64: fix ptrace(PTRACE_SYSCALL_INFO_EXIT) sign

In https://bugs.gentoo.org/769614 Dmitry noticed that
`ptrace(PTRACE_GET_SYSCALL_INFO)` does not return error sign properly.

The bug is in mismatch between get/set errors:

static inline long syscall_get_error(struct task_struct *task,
                                     struct pt_regs *regs)
{
        return regs->r10 == -1 ? regs->r8:0;
}

static inline long syscall_get_return_value(struct task_struct *task,
                                            struct pt_regs *regs)
{
        return regs->r8;
}

static inline void syscall_set_return_value(struct task_struct *task,
                                            struct pt_regs *regs,
                                            int error, long val)
{
        if (error) {
                /* error < 0, but ia64 uses > 0 return value */
                regs->r8 = -error;
                regs->r10 = -1;
        } else {
                regs->r8 = val;
                regs->r10 = 0;
        }
}

Tested on v5.10 on rx3600 machine (ia64 9040 CPU).

Link: https://lkml.kernel.org/r/20210221002554.333076-2-slyfox@gentoo.org
Link: https://bugs.gentoo.org/769614
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Reported-by: Dmitry V. Levin <ldv@altlinux.org>
Reviewed-by: Dmitry V. Levin <ldv@altlinux.org>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agoia64: fix ia64_syscall_get_set_arguments() for break-based syscalls
Sergei Trofimovich [Sat, 13 Mar 2021 05:08:23 +0000 (21:08 -0800)]
ia64: fix ia64_syscall_get_set_arguments() for break-based syscalls

In https://bugs.gentoo.org/769614 Dmitry noticed that
`ptrace(PTRACE_GET_SYSCALL_INFO)` does not work for syscalls called via
glibc's syscall() wrapper.

ia64 has two ways to call syscalls from userspace: via `break` and via
`eps` instructions.

The difference is in stack layout:

1. `eps` creates simple stack frame: no locals, in{0..7} == out{0..8}
2. `break` uses userspace stack frame: may be locals (glibc provides
   one), in{0..7} == out{0..8}.

Both work fine in syscall handling cde itself.

But `ptrace(PTRACE_GET_SYSCALL_INFO)` uses unwind mechanism to
re-extract syscall arguments but it does not account for locals.

The change always skips locals registers. It should not change `eps`
path as kernel's handler already enforces locals=0 and fixes `break`.

Tested on v5.10 on rx3600 machine (ia64 9040 CPU).

Link: https://lkml.kernel.org/r/20210221002554.333076-1-slyfox@gentoo.org
Link: https://bugs.gentoo.org/769614
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Reported-by: Dmitry V. Levin <ldv@altlinux.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agomm/userfaultfd: fix memory corruption due to writeprotect
Nadav Amit [Sat, 13 Mar 2021 05:08:17 +0000 (21:08 -0800)]
mm/userfaultfd: fix memory corruption due to writeprotect

Userfaultfd self-test fails occasionally, indicating a memory corruption.

Analyzing this problem indicates that there is a real bug since mmap_lock
is only taken for read in mwriteprotect_range() and defers flushes, and
since there is insufficient consideration of concurrent deferred TLB
flushes in wp_page_copy().  Although the PTE is flushed from the TLBs in
wp_page_copy(), this flush takes place after the copy has already been
performed, and therefore changes of the page are possible between the time
of the copy and the time in which the PTE is flushed.

To make matters worse, memory-unprotection using userfaultfd also poses a
problem.  Although memory unprotection is logically a promotion of PTE
permissions, and therefore should not require a TLB flush, the current
userrfaultfd code might actually cause a demotion of the architectural PTE
permission: when userfaultfd_writeprotect() unprotects memory region, it
unintentionally *clears* the RW-bit if it was already set.  Note that this
unprotecting a PTE that is not write-protected is a valid use-case: the
userfaultfd monitor might ask to unprotect a region that holds both
write-protected and write-unprotected PTEs.

The scenario that happens in selftests/vm/userfaultfd is as follows:

cpu0 cpu1 cpu2
---- ---- ----
[ Writable PTE
  cached in TLB ]
userfaultfd_writeprotect()
[ write-*unprotect* ]
mwriteprotect_range()
mmap_read_lock()
change_protection()

change_protection_range()
...
change_pte_range()
[ *clear* “write”-bit ]
[ defer TLB flushes ]
[ page-fault ]
...
wp_page_copy()
 cow_user_page()
  [ copy page ]
[ write to old
  page ]
...
 set_pte_at_notify()

A similar scenario can happen:

cpu0 cpu1 cpu2 cpu3
---- ---- ---- ----
[ Writable PTE
     cached in TLB ]
userfaultfd_writeprotect()
[ write-protect ]
[ deferred TLB flush ]
userfaultfd_writeprotect()
[ write-unprotect ]
[ deferred TLB flush]
[ page-fault ]
wp_page_copy()
 cow_user_page()
 [ copy page ]
 ... [ write to page ]
set_pte_at_notify()

This race exists since commit 292924b26024 ("userfaultfd: wp: apply
_PAGE_UFFD_WP bit").  Yet, as Yu Zhao pointed, these races became apparent
since commit 09854ba94c6a ("mm: do_wp_page() simplification") which made
wp_page_copy() more likely to take place, specifically if page_count(page)
> 1.

To resolve the aforementioned races, check whether there are pending
flushes on uffd-write-protected VMAs, and if there are, perform a flush
before doing the COW.

Further optimizations will follow to avoid during uffd-write-unprotect
unnecassary PTE write-protection and TLB flushes.

Link: https://lkml.kernel.org/r/20210304095423.3825684-1-namit@vmware.com
Fixes: 09854ba94c6a ("mm: do_wp_page() simplification")
Signed-off-by: Nadav Amit <namit@vmware.com>
Suggested-by: Yu Zhao <yuzhao@google.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Tested-by: Peter Xu <peterx@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: <stable@vger.kernel.org> [5.9+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agokasan: fix KASAN_STACK dependency for HW_TAGS
Andrey Konovalov [Sat, 13 Mar 2021 05:08:13 +0000 (21:08 -0800)]
kasan: fix KASAN_STACK dependency for HW_TAGS

There's a runtime failure when running HW_TAGS-enabled kernel built with
GCC on hardware that doesn't support MTE.  GCC-built kernels always have
CONFIG_KASAN_STACK enabled, even though stack instrumentation isn't
supported by HW_TAGS.  Having that config enabled causes KASAN to issue
MTE-only instructions to unpoison kernel stacks, which causes the failure.

Fix the issue by disallowing CONFIG_KASAN_STACK when HW_TAGS is used.

(The commit that introduced CONFIG_KASAN_HW_TAGS specified proper
 dependency for CONFIG_KASAN_STACK_ENABLE but not for CONFIG_KASAN_STACK.)

Link: https://lkml.kernel.org/r/59e75426241dbb5611277758c8d4d6f5f9298dac.1615215441.git.andreyknvl@google.com
Fixes: 6a63a63ff1ac ("kasan: introduce CONFIG_KASAN_HW_TAGS")
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: <stable@vger.kernel.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agokasan, mm: fix crash with HW_TAGS and DEBUG_PAGEALLOC
Andrey Konovalov [Sat, 13 Mar 2021 05:08:10 +0000 (21:08 -0800)]
kasan, mm: fix crash with HW_TAGS and DEBUG_PAGEALLOC

Currently, kasan_free_nondeferred_pages()->kasan_free_pages() is called
after debug_pagealloc_unmap_pages(). This causes a crash when
debug_pagealloc is enabled, as HW_TAGS KASAN can't set tags on an
unmapped page.

This patch puts kasan_free_nondeferred_pages() before
debug_pagealloc_unmap_pages() and arch_free_page(), which can also make
the page unavailable.

Link: https://lkml.kernel.org/r/24cd7db274090f0e5bc3adcdc7399243668e3171.1614987311.git.andreyknvl@google.com
Fixes: 94ab5b61ee16 ("kasan, arm64: enable CONFIG_KASAN_HW_TAGS")
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agomm/madvise: replace ptrace attach requirement for process_madvise
Suren Baghdasaryan [Sat, 13 Mar 2021 05:08:06 +0000 (21:08 -0800)]
mm/madvise: replace ptrace attach requirement for process_madvise

process_madvise currently requires ptrace attach capability.
PTRACE_MODE_ATTACH gives one process complete control over another
process.  It effectively removes the security boundary between the two
processes (in one direction).  Granting ptrace attach capability even to a
system process is considered dangerous since it creates an attack surface.
This severely limits the usage of this API.

The operations process_madvise can perform do not affect the correctness
of the operation of the target process; they only affect where the data is
physically located (and therefore, how fast it can be accessed).  What we
want is the ability for one process to influence another process in order
to optimize performance across the entire system while leaving the
security boundary intact.

Replace PTRACE_MODE_ATTACH with a combination of PTRACE_MODE_READ and
CAP_SYS_NICE.  PTRACE_MODE_READ to prevent leaking ASLR metadata and
CAP_SYS_NICE for influencing process performance.

Link: https://lkml.kernel.org/r/20210303185807.2160264-1-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Minchan Kim <minchan@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Jeff Vander Stoep <jeffv@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Tim Murray <timmurray@google.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: James Morris <jmorris@namei.org>
Cc: <stable@vger.kernel.org> [5.10+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agoinclude/linux/sched/mm.h: use rcu_dereference in in_vfork()
Matthew Wilcox (Oracle) [Sat, 13 Mar 2021 05:08:03 +0000 (21:08 -0800)]
include/linux/sched/mm.h: use rcu_dereference in in_vfork()

Fix a sparse warning by using rcu_dereference().  Technically this is a
bug and a sufficiently aggressive compiler could reload the `real_parent'
pointer outside the protection of the rcu lock (and access freed memory),
but I think it's pretty unlikely to happen.

Link: https://lkml.kernel.org/r/20210221194207.1351703-1-willy@infradead.org
Fixes: b18dc5f291c0 ("mm, oom: skip vforked tasks from being selected")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agokfence: fix reports if constant function prefixes exist
Marco Elver [Sat, 13 Mar 2021 05:08:00 +0000 (21:08 -0800)]
kfence: fix reports if constant function prefixes exist

Some architectures prefix all functions with a constant string ('.' on
ppc64).  Add ARCH_FUNC_PREFIX, which may optionally be defined in
<asm/kfence.h>, so that get_stack_skipnr() can work properly.

Link: https://lkml.kernel.org/r/f036c53d-7e81-763c-47f4-6024c6c5f058@csgroup.eu
Link: https://lkml.kernel.org/r/20210304144000.1148590-1-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Reported-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Tested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Jann Horn <jannh@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agokfence, slab: fix cache_alloc_debugcheck_after() for bulk allocations
Marco Elver [Sat, 13 Mar 2021 05:07:53 +0000 (21:07 -0800)]
kfence, slab: fix cache_alloc_debugcheck_after() for bulk allocations

cache_alloc_debugcheck_after() performs checks on an object, including
adjusting the returned pointer.  None of this should apply to KFENCE
objects.  While for non-bulk allocations, the checks are skipped when we
allocate via KFENCE, for bulk allocations cache_alloc_debugcheck_after()
is called via cache_alloc_debugcheck_after_bulk().

Fix it by skipping cache_alloc_debugcheck_after() for KFENCE objects.

Link: https://lkml.kernel.org/r/20210304205256.2162309-1-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Jann Horn <jannh@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agokfence: fix printk format for ptrdiff_t
Marco Elver [Sat, 13 Mar 2021 05:07:50 +0000 (21:07 -0800)]
kfence: fix printk format for ptrdiff_t

Use %td for ptrdiff_t.

Link: https://lkml.kernel.org/r/3abbe4c9-16ad-c168-a90f-087978ccd8f7@csgroup.eu
Link: https://lkml.kernel.org/r/20210303121157.3430807-1-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Reported-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agolinux/compiler-clang.h: define HAVE_BUILTIN_BSWAP*
Arnd Bergmann [Sat, 13 Mar 2021 05:07:47 +0000 (21:07 -0800)]
linux/compiler-clang.h: define HAVE_BUILTIN_BSWAP*

Separating compiler-clang.h from compiler-gcc.h inadventently dropped the
definitions of the three HAVE_BUILTIN_BSWAP macros, which requires falling
back to the open-coded version and hoping that the compiler detects it.

Since all versions of clang support the __builtin_bswap interfaces, add
back the flags and have the headers pick these up automatically.

This results in a 4% improvement of compilation speed for arm defconfig.

Note: it might also be worth revisiting which architectures set
CONFIG_ARCH_USE_BUILTIN_BSWAP for one compiler or the other, today this is
set on six architectures (arm32, csky, mips, powerpc, s390, x86), while
another ten architectures define custom helpers (alpha, arc, ia64, m68k,
mips, nios2, parisc, sh, sparc, xtensa), and the rest (arm64, h8300,
hexagon, microblaze, nds32, openrisc, riscv) just get the unoptimized
version and rely on the compiler to detect it.

A long time ago, the compiler builtins were architecture specific, but
nowadays, all compilers that are able to build the kernel have correct
implementations of them, though some may not be as optimized as the inline
asm versions.

The patch that dropped the optimization landed in v4.19, so as discussed
it would be fairly safe to backport this revert to stable kernels to the
4.19/5.4/5.10 stable kernels, but there is a remaining risk for
regressions, and it has no known side-effects besides compile speed.

Link: https://lkml.kernel.org/r/20210226161151.2629097-1-arnd@kernel.org
Link: https://lore.kernel.org/lkml/20210225164513.3667778-1-arnd@kernel.org/
Fixes: 815f0ddb346c ("include/linux/compiler*.h: make compiler-*.h mutually exclusive")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Guo Ren <guoren@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Sami Tolvanen <samitolvanen@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Arvind Sankar <nivedita@alum.mit.edu>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agoMAINTAINERS: exclude uapi directories in API/ABI section
Vlastimil Babka [Sat, 13 Mar 2021 05:07:44 +0000 (21:07 -0800)]
MAINTAINERS: exclude uapi directories in API/ABI section

Commit 7b4693e644cb ("MAINTAINERS: add uapi directories to API/ABI
section") added include/uapi/ and arch/*/include/uapi/ so that patches
modifying them CC linux-api.  However that was already done in the past
and resulted in too much noise and thus later removed, as explained in
b14fd334ff3d ("MAINTAINERS: trim the file triggers for ABI/API")

To prevent another round of addition and removal in the future, change the
entries to X: (explicit exclusion) for documentation purposes, although
they are not subdirectories of broader included directories, as there is
apparently no defined way to add plain comments in subsystem sections.

Link: https://lkml.kernel.org/r/20210301100255.25229-1-vbabka@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reported-by: Michael Kerrisk (man-pages) <mtk.manpages@gmail.com>
Acked-by: Michael Kerrisk (man-pages) <mtk.manpages@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agobinfmt_misc: fix possible deadlock in bm_register_write
Lior Ribak [Sat, 13 Mar 2021 05:07:41 +0000 (21:07 -0800)]
binfmt_misc: fix possible deadlock in bm_register_write

There is a deadlock in bm_register_write:

First, in the begining of the function, a lock is taken on the binfmt_misc
root inode with inode_lock(d_inode(root)).

Then, if the user used the MISC_FMT_OPEN_FILE flag, the function will call
open_exec on the user-provided interpreter.

open_exec will call a path lookup, and if the path lookup process includes
the root of binfmt_misc, it will try to take a shared lock on its inode
again, but it is already locked, and the code will get stuck in a deadlock

To reproduce the bug:
$ echo ":iiiii:E::ii::/proc/sys/fs/binfmt_misc/bla:F" > /proc/sys/fs/binfmt_misc/register

backtrace of where the lock occurs (#5):
0  schedule () at ./arch/x86/include/asm/current.h:15
1  0xffffffff81b51237 in rwsem_down_read_slowpath (sem=0xffff888003b202e0, count=<optimized out>, state=state@entry=2) at kernel/locking/rwsem.c:992
2  0xffffffff81b5150a in __down_read_common (state=2, sem=<optimized out>) at kernel/locking/rwsem.c:1213
3  __down_read (sem=<optimized out>) at kernel/locking/rwsem.c:1222
4  down_read (sem=<optimized out>) at kernel/locking/rwsem.c:1355
5  0xffffffff811ee22a in inode_lock_shared (inode=<optimized out>) at ./include/linux/fs.h:783
6  open_last_lookups (op=0xffffc9000022fe34, file=0xffff888004098600, nd=0xffffc9000022fd10) at fs/namei.c:3177
7  path_openat (nd=nd@entry=0xffffc9000022fd10, op=op@entry=0xffffc9000022fe34, flags=flags@entry=65) at fs/namei.c:3366
8  0xffffffff811efe1c in do_filp_open (dfd=<optimized out>, pathname=pathname@entry=0xffff8880031b9000, op=op@entry=0xffffc9000022fe34) at fs/namei.c:3396
9  0xffffffff811e493f in do_open_execat (fd=fd@entry=-100, name=name@entry=0xffff8880031b9000, flags=<optimized out>, flags@entry=0) at fs/exec.c:913
10 0xffffffff811e4a92 in open_exec (name=<optimized out>) at fs/exec.c:948
11 0xffffffff8124aa84 in bm_register_write (file=<optimized out>, buffer=<optimized out>, count=19, ppos=<optimized out>) at fs/binfmt_misc.c:682
12 0xffffffff811decd2 in vfs_write (file=file@entry=0xffff888004098500, buf=buf@entry=0xa758d0 ":iiiii:E::ii::i:CF
", count=count@entry=19, pos=pos@entry=0xffffc9000022ff10) at fs/read_write.c:603
13 0xffffffff811defda in ksys_write (fd=<optimized out>, buf=0xa758d0 ":iiiii:E::ii::i:CF
", count=19) at fs/read_write.c:658
14 0xffffffff81b49813 in do_syscall_64 (nr=<optimized out>, regs=0xffffc9000022ff58) at arch/x86/entry/common.c:46
15 0xffffffff81c0007c in entry_SYSCALL_64 () at arch/x86/entry/entry_64.S:120

To solve the issue, the open_exec call is moved to before the write
lock is taken by bm_register_write

Link: https://lkml.kernel.org/r/20210228224414.95962-1-liorribak@gmail.com
Fixes: 948b701a607f1 ("binfmt_misc: add persistent opened binary handler for containers")
Signed-off-by: Lior Ribak <liorribak@gmail.com>
Acked-by: Helge Deller <deller@gmx.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agomm/highmem.c: fix zero_user_segments() with start > end
OGAWA Hirofumi [Sat, 13 Mar 2021 05:07:37 +0000 (21:07 -0800)]
mm/highmem.c: fix zero_user_segments() with start > end

zero_user_segments() is used from __block_write_begin_int(), for example
like the following

zero_user_segments(page, 4096, 1024, 512, 918)

But new the zero_user_segments() implementation for for HIGHMEM +
TRANSPARENT_HUGEPAGE doesn't handle "start > end" case correctly, and hits
BUG_ON().  (we can fix __block_write_begin_int() instead though, it is the
old and multiple usage)

Also it calls kmap_atomic() unnecessarily while start == end == 0.

Link: https://lkml.kernel.org/r/87v9ab60r4.fsf@mail.parknet.co.jp
Fixes: 0060ef3b4e6d ("mm: support THPs in zero_user_segments")
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agohugetlb: do early cow when page pinned on src mm
Peter Xu [Sat, 13 Mar 2021 05:07:33 +0000 (21:07 -0800)]
hugetlb: do early cow when page pinned on src mm

This is the last missing piece of the COW-during-fork effort when there're
pinned pages found.  One can reference 70e806e4e645 ("mm: Do early cow for
pinned pages during fork() for ptes", 2020-09-27) for more information,
since we do similar things here rather than pte this time, but just for
hugetlb.

Note that after Jason's recent work on 57efa1fe5957 ("mm/gup: prevent
gup_fast from racing with COW during fork", 2020-12-15) which is safer and
easier to understand, we're safe now within the whole copy_page_range()
against gup-fast, we don't need the wr-protect trick that proposed in
70e806e4e645 anymore.

Link: https://lkml.kernel.org/r/20210217233547.93892-6-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Gal Pressman <galpress@amazon.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Kirill Shutemov <kirill@shutemov.name>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Roland Scheidegger <sroland@vmware.com>
Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Wei Zhang <wzam@amazon.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agomm: use is_cow_mapping() across tree where proper
Peter Xu [Sat, 13 Mar 2021 05:07:30 +0000 (21:07 -0800)]
mm: use is_cow_mapping() across tree where proper

After is_cow_mapping() is exported in mm.h, replace some manual checks
elsewhere throughout the tree but start to use the new helper.

Link: https://lkml.kernel.org/r/20210217233547.93892-5-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Jason Gunthorpe <jgg@ziepe.ca>
Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Roland Scheidegger <sroland@vmware.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Gal Pressman <galpress@amazon.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Kirill Shutemov <kirill@shutemov.name>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Wei Zhang <wzam@amazon.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agomm: introduce page_needs_cow_for_dma() for deciding whether cow
Peter Xu [Sat, 13 Mar 2021 05:07:26 +0000 (21:07 -0800)]
mm: introduce page_needs_cow_for_dma() for deciding whether cow

We've got quite a few places (pte, pmd, pud) that explicitly checked
against whether we should break the cow right now during fork().  It's
easier to provide a helper, especially before we work the same thing on
hugetlbfs.

Since we'll reference is_cow_mapping() in mm.h, move it there too.
Actually it suites mm.h more since internal.h is mm/ only, but mm.h is
exported to the whole kernel.  With that we should expect another patch to
use is_cow_mapping() whenever we can across the kernel since we do use it
quite a lot but it's always done with raw code against VM_* flags.

Link: https://lkml.kernel.org/r/20210217233547.93892-4-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Gal Pressman <galpress@amazon.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Kirill Shutemov <kirill@shutemov.name>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Roland Scheidegger <sroland@vmware.com>
Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Wei Zhang <wzam@amazon.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agohugetlb: break earlier in add_reservation_in_range() when we can
Peter Xu [Sat, 13 Mar 2021 05:07:22 +0000 (21:07 -0800)]
hugetlb: break earlier in add_reservation_in_range() when we can

All the regions maintained in hugetlb reserved map is inclusive on "from"
but exclusive on "to".  We can break earlier even if rg->from==t because
it already means no possible intersection.

This does not need a Fixes in all cases because when it happens
(rg->from==t) we'll not break out of the loop while we should, however the
next thing we'd do is still add the last file_region we'd need and quit
the loop in the next round.  So this change is not a bugfix (since the old
code should still run okay iiuc), but we'd better still touch it up to
make it logically sane.

Link: https://lkml.kernel.org/r/20210217233547.93892-3-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Gal Pressman <galpress@amazon.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Kirill Shutemov <kirill@shutemov.name>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Roland Scheidegger <sroland@vmware.com>
Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Wei Zhang <wzam@amazon.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agohugetlb: dedup the code to add a new file_region
Peter Xu [Sat, 13 Mar 2021 05:07:18 +0000 (21:07 -0800)]
hugetlb: dedup the code to add a new file_region

Patch series "mm/hugetlb: Early cow on fork, and a few cleanups", v5.

As reported by Gal [1], we still miss the code clip to handle early cow
for hugetlb case, which is true.  Again, it still feels odd to fork()
after using a few huge pages, especially if they're privately mapped to
me..  However I do agree with Gal and Jason in that we should still have
that since that'll complete the early cow on fork effort at least, and
it'll still fix issues where buffers are not well under control and not
easy to apply MADV_DONTFORK.

The first two patches (1-2) are some cleanups I noticed when reading into
the hugetlb reserve map code.  I think it's good to have but they're not
necessary for fixing the fork issue.

The last two patches (3-4) are the real fix.

I tested this with a fork() after some vfio-pci assignment, so I'm pretty
sure the page copy path could trigger well (page will be accounted right
after the fork()), but I didn't do data check since the card I assigned is
some random nic.

  https://github.com/xzpeter/linux/tree/fork-cow-pin-huge

[1] https://lore.kernel.org/lkml/27564187-4a08-f187-5a84-3df50009f6ca@amazon.com/

Introduce hugetlb_resv_map_add() helper to add a new file_region rather
than duplication the similar code twice in add_reservation_in_range().

Link: https://lkml.kernel.org/r/20210217233547.93892-1-peterx@redhat.com
Link: https://lkml.kernel.org/r/20210217233547.93892-2-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Gal Pressman <galpress@amazon.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Wei Zhang <wzam@amazon.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jann Horn <jannh@google.com>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Kirill Shutemov <kirill@shutemov.name>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Cc: Roland Scheidegger <sroland@vmware.com>
Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agomm/fork: clear PASID for new mm
Fenghua Yu [Sat, 13 Mar 2021 05:07:15 +0000 (21:07 -0800)]
mm/fork: clear PASID for new mm

When a new mm is created, its PASID should be cleared, i.e.  the PASID is
initialized to its init state 0 on both ARM and X86.

This patch was part of the series introducing mm->pasid, but got lost
along the way [1].  It still makes sense to have it, because each address
space has a different PASID.  And the IOMMU code in
iommu_sva_alloc_pasid() expects the pasid field of a new mm struct to be
cleared.

[1] https://lore.kernel.org/linux-iommu/YDgh53AcQHT+T3L0@otcwcpicx3.sc.intel.com/

Link: https://lkml.kernel.org/r/20210302103837.2562625-1-jean-philippe@linaro.org
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Cc: Jacob Pan <jacob.jun.pan@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agomm/page_alloc.c: refactor initialization of struct page for holes in memory layout
Mike Rapoport [Sat, 13 Mar 2021 05:07:12 +0000 (21:07 -0800)]
mm/page_alloc.c: refactor initialization of struct page for holes in memory layout

There could be struct pages that are not backed by actual physical memory.
This can happen when the actual memory bank is not a multiple of
SECTION_SIZE or when an architecture does not register memory holes
reserved by the firmware as memblock.memory.

Such pages are currently initialized using init_unavailable_mem() function
that iterates through PFNs in holes in memblock.memory and if there is a
struct page corresponding to a PFN, the fields of this page are set to
default values and it is marked as Reserved.

init_unavailable_mem() does not take into account zone and node the page
belongs to and sets both zone and node links in struct page to zero.

Before commit 73a6e474cb37 ("mm: memmap_init: iterate over memblock
regions rather that check each PFN") the holes inside a zone were
re-initialized during memmap_init() and got their zone/node links right.
However, after that commit nothing updates the struct pages representing
such holes.

On a system that has firmware reserved holes in a zone above ZONE_DMA, for
instance in a configuration below:

# grep -A1 E820 /proc/iomem
7a17b000-7a216fff : Unknown E820 type
7a217000-7bffffff : System RAM

unset zone link in struct page will trigger

VM_BUG_ON_PAGE(!zone_spans_pfn(page_zone(page), pfn), page);

in set_pfnblock_flags_mask() when called with a struct page from a range
other than E820_TYPE_RAM because there are pages in the range of
ZONE_DMA32 but the unset zone link in struct page makes them appear as a
part of ZONE_DMA.

Interleave initialization of the unavailable pages with the normal
initialization of memory map, so that zone and node information will be
properly set on struct pages that are not backed by the actual memory.

With this change the pages for holes inside a zone will get proper
zone/node links and the pages that are not spanned by any node will get
links to the adjacent zone/node.  The holes between nodes will be
prepended to the zone/node above the hole and the trailing pages in the
last section that will be appended to the zone/node below.

[akpm@linux-foundation.org: don't initialize static to zero, use %llu for u64]

Link: https://lkml.kernel.org/r/20210225224351.7356-2-rppt@kernel.org
Fixes: 73a6e474cb37 ("mm: memmap_init: iterate over memblock regions rather that check each PFN")
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Reported-by: Qian Cai <cai@lca.pw>
Reported-by: Andrea Arcangeli <aarcange@redhat.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Łukasz Majczak <lma@semihalf.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: "Sarvela, Tomi P" <tomi.p.sarvela@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agoinit/Kconfig: make COMPILE_TEST depend on HAS_IOMEM
Masahiro Yamada [Sat, 13 Mar 2021 05:07:08 +0000 (21:07 -0800)]
init/Kconfig: make COMPILE_TEST depend on HAS_IOMEM

I read the commit log of the following two:

bc083a64b6c0 ("init/Kconfig: make COMPILE_TEST depend on !UML")
334ef6ed06fa ("init/Kconfig: make COMPILE_TEST depend on !S390")

Both are talking about HAS_IOMEM dependency missing in many drivers.

So, 'depends on HAS_IOMEM' seems the direct, sensible solution to me.

This does not change the behavior of UML. UML still cannot enable
COMPILE_TEST because it does not provide HAS_IOMEM.

The current dependency for S390 is too strong. Under the condition of
CONFIG_PCI=y, S390 provides HAS_IOMEM, hence can enable COMPILE_TEST.

I also removed the meaningless 'default n'.

Link: https://lkml.kernel.org/r/20210224140809.1067582-1-masahiroy@kernel.org
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Arnd Bergmann <arnd@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KP Singh <kpsingh@google.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Terrell <terrelln@fb.com>
Cc: Quentin Perret <qperret@google.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: "Enrico Weigelt, metux IT consult" <lkml@metux.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agostop_machine: mark helpers __always_inline
Arnd Bergmann [Sat, 13 Mar 2021 05:07:04 +0000 (21:07 -0800)]
stop_machine: mark helpers __always_inline

With clang-13, some functions only get partially inlined, with a
specialized version referring to a global variable.  This triggers a
harmless build-time check for the intel-rng driver:

WARNING: modpost: drivers/char/hw_random/intel-rng.o(.text+0xe): Section mismatch in reference from the function stop_machine() to the function .init.text:intel_rng_hw_init()
The function stop_machine() references
the function __init intel_rng_hw_init().
This is often because stop_machine lacks a __init
annotation or the annotation of intel_rng_hw_init is wrong.

In this instance, an easy workaround is to force the stop_machine()
function to be inline, along with related interfaces that did not show the
same behavior at the moment, but theoretically could.

The combination of the two patches listed below triggers the behavior in
clang-13, but individually these commits are correct.

Link: https://lkml.kernel.org/r/20210225130153.1956990-1-arnd@kernel.org
Fixes: fe5595c07400 ("stop_machine: Provide stop_machine_cpuslocked()")
Fixes: ee527cd3a20c ("Use stop_machine_run in the Intel RNG driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agomemblock: fix section mismatch warning
Arnd Bergmann [Sat, 13 Mar 2021 05:07:01 +0000 (21:07 -0800)]
memblock: fix section mismatch warning

The inlining logic in clang-13 is rewritten to often not inline some
functions that were inlined by all earlier compilers.

In case of the memblock interfaces, this exposed a harmless bug of a
missing __init annotation:

WARNING: modpost: vmlinux.o(.text+0x507c0a): Section mismatch in reference from the function memblock_bottom_up() to the variable .meminit.data:memblock
The function memblock_bottom_up() references
the variable __meminitdata memblock.
This is often because memblock_bottom_up lacks a __meminitdata
annotation or the annotation of memblock is wrong.

Interestingly, these annotations were present originally, but got removed
with the explanation that the __init annotation prevents the function from
getting inlined.  I checked this again and found that while this is the
case with clang, gcc (version 7 through 10, did not test others) does
inline the functions regardless.

As the previous change was apparently intended to help the clang builds,
reverting it to help the newer clang versions seems appropriate as well.
gcc builds don't seem to care either way.

Link: https://lkml.kernel.org/r/20210225133808.2188581-1-arnd@kernel.org
Fixes: 5bdba520c1b3 ("mm: memblock: drop __init from memblock functions to make it inline")
Reference: 2cfb3665e864 ("include/linux/memblock.h: add __init to memblock_set_bottom_up()")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Faiyaz Mohammed <faiyazm@codeaurora.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Aslan Bakirov <aslan@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agokbuild: fix ld-version.sh to not be affected by locale
Masahiro Yamada [Fri, 12 Mar 2021 19:38:14 +0000 (04:38 +0900)]
kbuild: fix ld-version.sh to not be affected by locale

ld-version.sh checks the output from $(LD) --version, but it has a
problem on some locales.

For example, in Italian:

  $ LC_MESSAGES=it_IT.UTF-8 ld --version | head -n 1
  ld di GNU (GNU Binutils for Debian) 2.35.2

This makes ld-version.sh fail because it expects "GNU ld" for the
BFD linker case.

Add LC_ALL=C to override the user's locale.

BTW, setting LC_MESSAGES=C (or LANG=C) is not enough because it is
ineffective if LC_ALL is set on the user's environment.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=212105
Reported-by: Marco Scardovi
Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Recensito-da: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
3 years agoMerge tag 'nfs-for-5.12-2' of git://git.linux-nfs.org/projects/anna/linux-nfs
Linus Torvalds [Fri, 12 Mar 2021 22:19:35 +0000 (14:19 -0800)]
Merge tag 'nfs-for-5.12-2' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull NFS client bugfixes from Anna Schumaker:
 "These are mostly fixes for issues discovered at the recent NFS
  bakeathon:

   - Fix PNFS_FLEXFILE_LAYOUT kconfig so it is possible to build
     into the kernel

   - Correct size calculationn for create reply length

   - Set memalloc_nofs_save() for sync tasks to prevent deadlocks

   - Don't revalidate directory permissions on lookup failure

   - Don't clear inode cache when lookup fails

   - Change functions to use nfs_set_cache_invalid() for proper
     delegation handling

   - Fix return value of _nfs4_get_security_label()

   - Return an error when attempting to remove system.nfs4_acl"

* tag 'nfs-for-5.12-2' of git://git.linux-nfs.org/projects/anna/linux-nfs:
  nfs: we don't support removing system.nfs4_acl
  NFSv4.2: fix return value of _nfs4_get_security_label()
  NFS: Fix open coded versions of nfs_set_cache_invalid() in NFSv4
  NFS: Fix open coded versions of nfs_set_cache_invalid()
  NFS: Clean up function nfs_mark_dir_for_revalidate()
  NFS: Don't gratuitously clear the inode cache when lookup failed
  NFS: Don't revalidate the directory permissions on a lookup failure
  SUNRPC: Set memalloc_nofs_save() for sync tasks
  NFS: Correct size calculation for create reply length
  nfs: fix PNFS_FLEXFILE_LAYOUT Kconfig default

3 years agoMerge branch 'for-v5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/ebieder...
Linus Torvalds [Fri, 12 Mar 2021 21:58:04 +0000 (13:58 -0800)]
Merge branch 'for-v5.12-rc3' of git://git./linux/kernel/git/ebiederm/user-namespace

Pull userns fix from Eric Biederman:
 "Removing the ambiguity broke userspace so this reverts the change"

* 'for-v5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  Revert 95ebabde382c ("capabilities: Don't allow writing ambiguous v3 file capabilities")

3 years agoMerge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Linus Torvalds [Fri, 12 Mar 2021 21:37:18 +0000 (13:37 -0800)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "Ten updates: one non code maintainer update for vmw_pvscsi, five code
  updates for ibmvfc and four for UFS.

  All are either trivial patches or bug fixes"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: vmw_pvscsi: MAINTAINERS: Update maintainer
  scsi: ufs: Convert sysfs sprintf/snprintf family to sysfs_emit
  scsi: ufs: Remove redundant checks of !hba in suspend/resume callbacks
  scsi: ufs: ufs-qcom: Disable interrupt in reset path
  scsi: ufs: Minor adjustments to error handling
  scsi: ibmvfc: Reinitialize sub-CRQs and perform channel enquiry after LPM
  scsi: ibmvfc: Store return code of H_FREE_SUB_CRQ during cleanup
  scsi: ibmvfc: Treat H_CLOSED as success during sub-CRQ registration
  scsi: ibmvfc: Fix invalid sub-CRQ handles after hard reset
  scsi: ibmvfc: Simplify handling of sub-CRQ initialization

3 years agoRevert 95ebabde382c ("capabilities: Don't allow writing ambiguous v3 file capabilities")
Eric W. Biederman [Fri, 12 Mar 2021 21:07:09 +0000 (15:07 -0600)]
Revert 95ebabde382c ("capabilities: Don't allow writing ambiguous v3 file capabilities")

It turns out that there are in fact userspace implementations that
care and this recent change caused a regression.

https://github.com/containers/buildah/issues/3071

As the motivation for the original change was future development,
and the impact is existing real world code just revert this change
and allow the ambiguity in v3 file caps.

Cc: stable@vger.kernel.org
Fixes: 95ebabde382c ("capabilities: Don't allow writing ambiguous v3 file capabilities")
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
3 years agoMerge tag 'block-5.12-2021-03-12-v2' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 12 Mar 2021 21:25:49 +0000 (13:25 -0800)]
Merge tag 'block-5.12-2021-03-12-v2' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "Mostly just random fixes all over the map.

  The only odd-one-out change is finally getting the rename of
  BIO_MAX_PAGES to BIO_MAX_VECS done. This should've been done with the
  multipage bvec change, but it's been left.

  Do it now to avoid hassles around changes piling up for the next merge
  window.

  Summary:

   - NVMe pull request:
      - one more quirk (Dmitry Monakhov)
      - fix max_zone_append_sectors initialization (Chaitanya Kulkarni)
      - nvme-fc reset/create race fix (James Smart)
      - fix status code on aborts/resets (Hannes Reinecke)
      - fix the CSS check for ZNS namespaces (Chaitanya Kulkarni)
      - fix a use after free in a debug printk in nvme-rdma (Lv Yunlong)

   - Follow-up NVMe error fix for NULL 'id' (Christoph)

   - Fixup for the bd_size_lock being IRQ safe, now that the offending
     driver has been dropped (Damien).

   - rsxx probe failure error return (Jia-Ju)

   - umem probe failure error return (Wei)

   - s390/dasd unbind fixes (Stefan)

   - blk-cgroup stats summing fix (Xunlei)

   - zone reset handling fix (Damien)

   - Rename BIO_MAX_PAGES to BIO_MAX_VECS (Christoph)

   - Suppress uevent trigger for hidden devices (Daniel)

   - Fix handling of discard on busy device (Jan)

   - Fix stale cache issue with zone reset (Shin'ichiro)"

* tag 'block-5.12-2021-03-12-v2' of git://git.kernel.dk/linux-block:
  nvme: fix the nsid value to print in nvme_validate_or_alloc_ns
  block: Discard page cache of zone reset target range
  block: Suppress uevent for hidden device when removed
  block: rename BIO_MAX_PAGES to BIO_MAX_VECS
  nvme-pci: add the DISABLE_WRITE_ZEROES quirk for a Samsung PM1725a
  nvme-rdma: Fix a use after free in nvmet_rdma_write_data_done
  nvme-core: check ctrl css before setting up zns
  nvme-fc: fix racing controller reset and create association
  nvme-fc: return NVME_SC_HOST_ABORTED_CMD when a command has been aborted
  nvme-fc: set NVME_REQ_CANCELLED in nvme_fc_terminate_exchange()
  nvme: add NVME_REQ_CANCELLED flag in nvme_cancel_request()
  nvme: simplify error logic in nvme_validate_ns()
  nvme: set max_zone_append_sectors nvme_revalidate_zones
  block: rsxx: fix error return code of rsxx_pci_probe()
  block: Fix REQ_OP_ZONE_RESET_ALL handling
  umem: fix error return code in mm_pci_probe()
  blk-cgroup: Fix the recursive blkg rwstat
  s390/dasd: fix hanging IO request during DASD driver unbind
  s390/dasd: fix hanging DASD driver unbind
  block: Try to handle busy underlying device on discard

3 years agoMerge tag 'io_uring-5.12-2021-03-12' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 12 Mar 2021 21:13:57 +0000 (13:13 -0800)]
Merge tag 'io_uring-5.12-2021-03-12' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:
 "Not quite as small this week as I had hoped, but at least this should
  be the end of it. All the little known issues have been ironed out -
  most of it little stuff, but cancelations being the bigger part. Only
  minor tweaks and/or regular fixes expected beyond this point.

   - Fix the creds tracking for async (io-wq and SQPOLL)

   - Various SQPOLL fixes related to parking, sharing, forking, IOPOLL,
     completions, and life times. Much simpler now.

   - Make IO threads unfreezable by default, on account of a bug report
     that had them spinning on resume. Honestly not quite sure why
     thawing leaves us with a perpetual signal pending (causing the
     spin), but for now make them unfreezable like there were in 5.11
     and prior.

   - Move personality_idr to xarray, solving a use-after-free related to
     removing an entry from the iterator callback. Buffer idr needs the
     same treatment.

   - Re-org around and task vs context tracking, enabling the fixing of
     cancelations, and then cancelation fixes on top.

   - Various little bits of cleanups and hardening, and removal of now
     dead parts"

* tag 'io_uring-5.12-2021-03-12' of git://git.kernel.dk/linux-block: (34 commits)
  io_uring: fix OP_ASYNC_CANCEL across tasks
  io_uring: cancel sqpoll via task_work
  io_uring: prevent racy sqd->thread checks
  io_uring: remove useless ->startup completion
  io_uring: cancel deferred requests in try_cancel
  io_uring: perform IOPOLL reaping if canceler is thread itself
  io_uring: force creation of separate context for ATTACH_WQ and non-threads
  io_uring: remove indirect ctx into sqo injection
  io_uring: fix invalid ctx->sq_thread_idle
  kernel: make IO threads unfreezable by default
  io_uring: always wait for sqd exited when stopping SQPOLL thread
  io_uring: remove unneeded variable 'ret'
  io_uring: move all io_kiocb init early in io_init_req()
  io-wq: fix ref leak for req in case of exit cancelations
  io_uring: fix complete_post races for linked req
  io_uring: add io_disarm_next() helper
  io_uring: fix io_sq_offload_create error handling
  io-wq: remove unused 'user' member of io_wq
  io_uring: Convert personality_idr to XArray
  io_uring: clean R_DISABLED startup mess
  ...

3 years agoMerge tag 'devprop-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
Linus Torvalds [Fri, 12 Mar 2021 21:09:29 +0000 (13:09 -0800)]
Merge tag 'devprop-5.12-rc3' of git://git./linux/kernel/git/rafael/linux-pm

Pull device properties framework fixes from Rafael Wysocki:
 "Prevent software nodes from being registered before their parents and
  fix a recent mistake causing already registered software nodes to be
  registered again in some cases (Heikki Krogerus)"

* tag 'devprop-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  software node: Fix device_add_software_node()
  software node: Fix node registration

3 years agoMerge tag 'pm-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Linus Torvalds [Fri, 12 Mar 2021 20:28:03 +0000 (12:28 -0800)]
Merge tag 'pm-5.12-rc3' of git://git./linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix an operating performance point (OPP) reference counting
  issue and three issues in ARM cpufreq drivers.

  Specifics:

   - Add a flag to mark OPPs that are not referenced by he OPP core any
     more to prevent OPPs from being freed prematurely by mistake (Beata
     Michalska).

   - Add ARM Vexpress platforms to the cpufreq-dt-platdev blacklist
     since the actual scaling of them is handled elsewhere (Sudeep
     Holla).

   - Fix a function return value check and a possible use-after-free in
     the qcom-hw cpufreq driver (Shawn Guo, Wei Yongjun)"

* tag 'pm-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  opp: Don't drop extra references to OPPs accidentally
  cpufreq: blacklist Arm Vexpress platforms in cpufreq-dt-platdev
  cpufreq: qcom-hw: Fix return value check in qcom_cpufreq_hw_cpu_init()
  cpufreq: qcom-hw: fix dereferencing freed memory 'data'

3 years agonvme: fix the nsid value to print in nvme_validate_or_alloc_ns
Christoph Hellwig [Fri, 12 Mar 2021 19:55:36 +0000 (20:55 +0100)]
nvme: fix the nsid value to print in nvme_validate_or_alloc_ns

ns can be NULL at this point, and my move of the check from
the original patch by Chaitanya broke this.

Fixes: 0ec84df4953b ("nvme-core: check ctrl css before setting up zns")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoMerge tag 'sound-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
Linus Torvalds [Fri, 12 Mar 2021 20:01:26 +0000 (12:01 -0800)]
Merge tag 'sound-5.12-rc3' of git://git./linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "No surprise here, only a collection of device-specific fixes for
  USB-audio and HD-audio at this time"

* tag 'sound-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda/hdmi: Cancel pending works before suspend
  ALSA: hda: Avoid spurious unsol event handling during S3/S4
  ALSA: hda: Flush pending unsolicited events before suspend
  ALSA: usb-audio: fix use after free in usb_audio_disconnect
  ALSA: usb-audio: fix NULL ptr dereference in usb_audio_probe
  ALSA: hda/ca0132: Add Sound BlasterX AE-5 Plus support
  ALSA: hda: Drop the BATCH workaround for AMD controllers
  ALSA: hda/conexant: Add quirk for mute LED control on HP ZBook G5
  ALSA: usb-audio: Apply the control quirk to Plantronics headsets
  ALSA: usb-audio: Fix "cannot get freq eq" errors on Dell AE515 sound bar
  ALSA: hda: ignore invalid NHLT table
  ALSA: usb-audio: Disable USB autosuspend properly in setup_disable_autosuspend()
  ALSA: usb: Add Plantronics C320-M USB ctrl msg delay quirk

3 years agoMerge tag 'mmc-v5.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
Linus Torvalds [Fri, 12 Mar 2021 19:58:33 +0000 (11:58 -0800)]
Merge tag 'mmc-v5.12-rc2' of git://git./linux/kernel/git/ulfh/mmc

Pull MMC fixes from Ulf Hansson:
 "MMC core:

   - Fix partition switch time for eMMC

  MMC host:

   - mmci: Enforce R1B response to fix busy detection for
     the stm32 variants

   - cqhci: Fix crash when removing mmc module/card"

* tag 'mmc-v5.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
  mmc: cqhci: Fix random crash when remove mmc module/card
  mmc: core: Fix partition switch time for eMMC
  mmc: mmci: Add MMC_CAP_NEED_RSP_BUSY for the stm32 variants

3 years agoMerge tag 'regulator-fix-v5.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 12 Mar 2021 19:55:58 +0000 (11:55 -0800)]
Merge tag 'regulator-fix-v5.12-rc2' of git://git./linux/kernel/git/broonie/regulator

Pull regulator fixes from Mark Brown:
 "A small collection fo driver specific fixes that have arrived since
  the merge window"

* tag 'regulator-fix-v5.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator:
  regulator: mt6315: Fix off-by-one for .n_voltages
  regulator: rt4831: Fix return value check in rt4831_regulator_probe()
  regulator: pca9450: Clear PRESET_EN bit to fix BUCK1/2/3 voltage setting
  regulator: qcom-rpmh: Use correct buck for S1C regulator
  regulator: qcom-rpmh: Correct the pmic5_hfsmps515 buck
  regulator: pca9450: Fix return value when failing to get sd-vsel GPIO
  regulator: mt6315: Return REGULATOR_MODE_INVALID for invalid mode

3 years agoMerge tag 'configfs-for-5.12' of git://git.infradead.org/users/hch/configfs
Linus Torvalds [Fri, 12 Mar 2021 19:48:14 +0000 (11:48 -0800)]
Merge tag 'configfs-for-5.12' of git://git.infradead.org/users/hch/configfs

Pull configfs fix from Christoph Hellwig:

 - fix a use-after-free in __configfs_open_file (Daiyue Zhang)

* tag 'configfs-for-5.12' of git://git.infradead.org/users/hch/configfs:
  configfs: fix a use-after-free in __configfs_open_file

3 years agoMerge tag 'gfs2-v5.12-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Fri, 12 Mar 2021 19:46:09 +0000 (11:46 -0800)]
Merge tag 'gfs2-v5.12-rc2-fixes' of git://git./linux/kernel/git/gfs2/linux-gfs2

Pull gfs2 fixes from Andreas Gruenbacher:
 "Various gfs2 fixes"

* tag 'gfs2-v5.12-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: bypass log flush if the journal is not live
  gfs2: bypass signal_our_withdraw if no journal
  gfs2: fix use-after-free in trans_drain
  gfs2: make function gfs2_make_fs_ro() to void type

3 years agoMerge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Linus Torvalds [Fri, 12 Mar 2021 19:39:53 +0000 (11:39 -0800)]
Merge tag 'arm64-fixes' of git://git./linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
 "We've got a smattering of changes all over the place which we've
  acrued since -rc1. To my knowledge, there aren't any pending issues at
  the moment, but there's still plenty of time for something else to
  crop up...

  Summary:

   - Fix booting a 52-bit-VA-aware kernel on Qualcomm Amberwing

   - Fix pfn_valid() not to reject all ZONE_DEVICE memory

   - Fix memory tagging setup for hotplugged memory regions

   - Fix KASAN tagging in page_alloc() when DEBUG_VIRTUAL is enabled

   - Fix accidental truncation of CPU PMU event counters

   - Fix error code initialisation when failing probe of DMC620 PMU

   - Fix return value initialisation for sve-ptrace selftest

   - Drop broken support for CMDLINE_EXTEND"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  perf/arm_dmc620_pmu: Fix error return code in dmc620_pmu_device_probe()
  arm64: mm: remove unused __cpu_uses_extended_idmap[_level()]
  arm64: mm: use a 48-bit ID map when possible on 52-bit VA builds
  arm64: perf: Fix 64-bit event counter read truncation
  arm64/mm: Fix __enable_mmu() for new TGRAN range values
  kselftest: arm64: Fix exit code of sve-ptrace
  arm64: mte: Map hotplugged memory as Normal Tagged
  arm64: kasan: fix page_alloc tagging with DEBUG_VIRTUAL
  arm64/mm: Reorganize pfn_valid()
  arm64/mm: Fix pfn_valid() for ZONE_DEVICE based memory
  arm64/mm: Drop THP conditionality from FORCE_MAX_ZONEORDER
  arm64/mm: Drop redundant ARCH_WANT_HUGE_PMD_SHARE
  arm64: Drop support for CMDLINE_EXTEND
  arm64: cpufeatures: Fix handling of CONFIG_CMDLINE for idreg overrides

3 years agoMerge tag 'for-linus-5.12b-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 12 Mar 2021 19:34:36 +0000 (11:34 -0800)]
Merge tag 'for-linus-5.12b-rc3-tag' of git://git./linux/kernel/git/xen/tip

Pull xen fixes from Juergen Gross:
 "Two fix series and a single cleanup:

   - a small cleanup patch to remove unneeded symbol exports

   - a series to cleanup Xen grant handling (avoiding allocations in
     some cases, and using common defines for "invalid" values)

   - a series to address a race issue in Xen event channel handling"

* tag 'for-linus-5.12b-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  Xen/gntdev: don't needlessly use kvcalloc()
  Xen/gnttab: introduce common INVALID_GRANT_{HANDLE,REF}
  Xen/gntdev: don't needlessly allocate k{,un}map_ops[]
  Xen: drop exports of {set,clear}_foreign_p2m_mapping()
  xen/events: avoid handling the same event on two cpus at the same time
  xen/events: don't unmask an event channel when an eoi is pending
  xen/events: reset affinity of 2-level event when tearing it down

3 years agoKVM: LAPIC: Advancing the timer expiration on guest initiated write
Wanpeng Li [Thu, 4 Mar 2021 00:35:18 +0000 (08:35 +0800)]
KVM: LAPIC: Advancing the timer expiration on guest initiated write

Advancing the timer expiration should only be necessary on guest initiated
writes. When we cancel the timer and clear .pending during state restore,
clear expired_tscdeadline as well.

Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1614818118-965-1-git-send-email-wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
3 years agoKVM: x86/mmu: Skip !MMU-present SPTEs when removing SP in exclusive mode
Sean Christopherson [Wed, 10 Mar 2021 00:30:29 +0000 (16:30 -0800)]
KVM: x86/mmu: Skip !MMU-present SPTEs when removing SP in exclusive mode

If mmu_lock is held for write, don't bother setting !PRESENT SPTEs to
REMOVED_SPTE when recursively zapping SPTEs as part of shadow page
removal.  The concurrent write protections provided by REMOVED_SPTE are
not needed, there are no backing page side effects to record, and MMIO
SPTEs can be left as is since they are protected by the memslot
generation, not by ensuring that the MMIO SPTE is unreachable (which
is racy with respect to lockless walks regardless of zapping behavior).

Skipping !PRESENT drastically reduces the number of updates needed to
tear down sparsely populated MMUs, e.g. when tearing down a 6gb VM that
didn't touch much memory, 6929/7168 (~96.6%) of SPTEs were '0' and could
be skipped.

Avoiding the write itself is likely close to a wash, but avoiding
__handle_changed_spte() is a clear-cut win as that involves saving and
restoring all non-volatile GPRs (it's a subtly big function), as well as
several conditional branches before bailing out.

Cc: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210310003029.1250571-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
3 years agoKVM: kvmclock: Fix vCPUs > 64 can't be online/hotpluged
Wanpeng Li [Wed, 24 Feb 2021 01:37:29 +0000 (09:37 +0800)]
KVM: kvmclock: Fix vCPUs > 64 can't be online/hotpluged

# lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                88
On-line CPU(s) list:   0-63
Off-line CPU(s) list:  64-87

# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-5.10.0-rc3-tlinux2-0050+ root=/dev/mapper/cl-root ro
rd.lvm.lv=cl/root rhgb quiet console=ttyS0 LANG=en_US .UTF-8 no-kvmclock-vsyscall

# echo 1 > /sys/devices/system/cpu/cpu76/online
-bash: echo: write error: Cannot allocate memory

The per-cpu vsyscall pvclock data pointer assigns either an element of the
static array hv_clock_boot (#vCPU <= 64) or dynamically allocated memory
hvclock_mem (vCPU > 64), the dynamically memory will not be allocated if
kvmclock vsyscall is disabled, this can result in cpu hotpluged fails in
kvmclock_setup_percpu() which returns -ENOMEM. It's broken for no-vsyscall
and sometimes you end up with vsyscall disabled if the host does something
strange. This patch fixes it by allocating this dynamically memory
unconditionally even if vsyscall is disabled.

Fixes: 6a1cac56f4 ("x86/kvm: Use __bss_decrypted attribute in shared variables")
Reported-by: Zelin Deng <zelin.deng@linux.alibaba.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: stable@vger.kernel.org#v4.19-rc5+
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1614130683-24137-1-git-send-email-wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
3 years agokvm: x86: annotate RCU pointers
Muhammad Usama Anjum [Fri, 5 Mar 2021 19:11:23 +0000 (00:11 +0500)]
kvm: x86: annotate RCU pointers

This patch adds the annotation to fix the following sparse errors:
arch/x86/kvm//x86.c:8147:15: error: incompatible types in comparison expression (different address spaces):
arch/x86/kvm//x86.c:8147:15:    struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm//x86.c:8147:15:    struct kvm_apic_map *
arch/x86/kvm//x86.c:10628:16: error: incompatible types in comparison expression (different address spaces):
arch/x86/kvm//x86.c:10628:16:    struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm//x86.c:10628:16:    struct kvm_apic_map *
arch/x86/kvm//x86.c:10629:15: error: incompatible types in comparison expression (different address spaces):
arch/x86/kvm//x86.c:10629:15:    struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm//x86.c:10629:15:    struct kvm_pmu_event_filter *
arch/x86/kvm//lapic.c:267:15: error: incompatible types in comparison expression (different address spaces):
arch/x86/kvm//lapic.c:267:15:    struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm//lapic.c:267:15:    struct kvm_apic_map *
arch/x86/kvm//lapic.c:269:9: error: incompatible types in comparison expression (different address spaces):
arch/x86/kvm//lapic.c:269:9:    struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm//lapic.c:269:9:    struct kvm_apic_map *
arch/x86/kvm//lapic.c:637:15: error: incompatible types in comparison expression (different address spaces):
arch/x86/kvm//lapic.c:637:15:    struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm//lapic.c:637:15:    struct kvm_apic_map *
arch/x86/kvm//lapic.c:994:15: error: incompatible types in comparison expression (different address spaces):
arch/x86/kvm//lapic.c:994:15:    struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm//lapic.c:994:15:    struct kvm_apic_map *
arch/x86/kvm//lapic.c:1036:15: error: incompatible types in comparison expression (different address spaces):
arch/x86/kvm//lapic.c:1036:15:    struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm//lapic.c:1036:15:    struct kvm_apic_map *
arch/x86/kvm//lapic.c:1173:15: error: incompatible types in comparison expression (different address spaces):
arch/x86/kvm//lapic.c:1173:15:    struct kvm_apic_map [noderef] __rcu *
arch/x86/kvm//lapic.c:1173:15:    struct kvm_apic_map *
arch/x86/kvm//pmu.c:190:18: error: incompatible types in comparison expression (different address spaces):
arch/x86/kvm//pmu.c:190:18:    struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm//pmu.c:190:18:    struct kvm_pmu_event_filter *
arch/x86/kvm//pmu.c:251:18: error: incompatible types in comparison expression (different address spaces):
arch/x86/kvm//pmu.c:251:18:    struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm//pmu.c:251:18:    struct kvm_pmu_event_filter *
arch/x86/kvm//pmu.c:522:18: error: incompatible types in comparison expression (different address spaces):
arch/x86/kvm//pmu.c:522:18:    struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm//pmu.c:522:18:    struct kvm_pmu_event_filter *
arch/x86/kvm//pmu.c:522:18: error: incompatible types in comparison expression (different address spaces):
arch/x86/kvm//pmu.c:522:18:    struct kvm_pmu_event_filter [noderef] __rcu *
arch/x86/kvm//pmu.c:522:18:    struct kvm_pmu_event_filter *

Signed-off-by: Muhammad Usama Anjum <musamaanjum@gmail.com>
Message-Id: <20210305191123.GA497469@LEGION>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
3 years agoMerge branch 'pm-opp'
Rafael J. Wysocki [Fri, 12 Mar 2021 17:47:22 +0000 (18:47 +0100)]
Merge branch 'pm-opp'

* pm-opp:
  opp: Don't drop extra references to OPPs accidentally

3 years agoMerge branch 'opp/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm
Rafael J. Wysocki [Fri, 12 Mar 2021 17:45:44 +0000 (18:45 +0100)]
Merge branch 'opp/linux-next' of git://git./linux/kernel/git/vireshk/pm

Pull an operating performance points (OPP) framework fix for 5.12
from Viresh Kumar:

"Fix OPP refcount issue noticed by Beata."

* 'opp/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm:
  opp: Don't drop extra references to OPPs accidentally

3 years agoio_uring: fix OP_ASYNC_CANCEL across tasks
Pavel Begunkov [Fri, 12 Mar 2021 16:25:55 +0000 (16:25 +0000)]
io_uring: fix OP_ASYNC_CANCEL across tasks

IORING_OP_ASYNC_CANCEL tries io-wq cancellation only for current task.
If it fails go over tctx_list and try it out for every single tctx.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoio_uring: cancel sqpoll via task_work
Pavel Begunkov [Thu, 11 Mar 2021 23:29:38 +0000 (23:29 +0000)]
io_uring: cancel sqpoll via task_work

1) The first problem is io_uring_cancel_sqpoll() ->
io_uring_cancel_task_requests() basically doing park(); park(); and so
hanging.

2) Another one is more subtle, when the master task is doing cancellations,
but SQPOLL task submits in-between the end of the cancellation but
before finish() requests taking a ref to the ctx, and so eternally
locking it up.

3) Yet another is a dying SQPOLL task doing io_uring_cancel_sqpoll() and
same io_uring_cancel_sqpoll() from the owner task, they race for
tctx->wait events. And there probably more of them.

Instead do SQPOLL cancellations from within SQPOLL task context via
task_work, see io_sqpoll_cancel_sync(). With that we don't need temporal
park()/unpark() during cancellation, which is ugly, subtle and anyway
doesn't allow to do io_run_task_work() properly.

io_uring_cancel_sqpoll() is called only from SQPOLL task context and
under sqd locking, so all parking is removed from there. And so,
io_sq_thread_[un]park() and io_sq_thread_stop() are not used now by
SQPOLL task, and that spare us from some headache.

Also remove ctx->sqd_list early to avoid 2). And kill tctx->sqpoll,
which is not used anymore.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoio_uring: prevent racy sqd->thread checks
Pavel Begunkov [Thu, 11 Mar 2021 23:29:37 +0000 (23:29 +0000)]
io_uring: prevent racy sqd->thread checks

SQPOLL thread to which we're trying to attach may be going away, it's
not nice but a more serious problem is if io_sq_offload_create() sees
sqd->thread==NULL, and tries to init it with a new thread. There are
tons of ways it can be exploited or fail.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoKVM: arm64: Fix exclusive limit for IPA size
Marc Zyngier [Thu, 11 Mar 2021 10:00:16 +0000 (10:00 +0000)]
KVM: arm64: Fix exclusive limit for IPA size

When registering a memslot, we check the size and location of that
memslot against the IPA size to ensure that we can provide guest
access to the whole of the memory.

Unfortunately, this check rejects memslot that end-up at the exact
limit of the addressing capability for a given IPA size. For example,
it refuses the creation of a 2GB memslot at 0x8000000 with a 32bit
IPA space.

Fix it by relaxing the check to accept a memslot reaching the
limit of the IPA space.

Fixes: c3058d5da222 ("arm/arm64: KVM: Ensure memslots are within KVM_PHYS_SIZE")
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Reviewed-by: Andrew Jones <drjones@redhat.com>
Link: https://lore.kernel.org/r/20210311100016.3830038-3-maz@kernel.org
3 years agoKVM: arm64: Reject VM creation when the default IPA size is unsupported
Marc Zyngier [Thu, 11 Mar 2021 10:00:15 +0000 (10:00 +0000)]
KVM: arm64: Reject VM creation when the default IPA size is unsupported

KVM/arm64 has forever used a 40bit default IPA space, partially
due to its 32bit heritage (where the only choice is 40bit).

However, there are implementations in the wild that have a *cough*
much smaller *cough* IPA space, which leads to a misprogramming of
VTCR_EL2, and a guest that is stuck on its first memory access
if userspace dares to ask for the default IPA setting (which most
VMMs do).

Instead, blundly reject the creation of such VM, as we can't
satisfy the requirements from userspace (with a one-off warning).
Also clarify the boot warning, and document that the VM creation
will fail when an unsupported IPA size is provided.

Although this is an ABI change, it doesn't really change much
for userspace:

- the guest couldn't run before this change, but no error was
  returned. At least userspace knows what is happening.

- a memory slot that was accepted because it did fit the default
  IPA space now doesn't even get a chance to be registered.

The other thing that is left doing is to convince userspace to
actually use the IPA space setting instead of relying on the
antiquated default.

Fixes: 233a7cb23531 ("kvm: arm64: Allow tuning the physical address size for VM")
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20210311100016.3830038-2-maz@kernel.org
3 years agogfs2: bypass log flush if the journal is not live
Bob Peterson [Fri, 12 Mar 2021 13:47:47 +0000 (08:47 -0500)]
gfs2: bypass log flush if the journal is not live

Patch fe3e397668775 ("gfs2: Rework the log space allocation logic")
changed gfs2_log_flush to reserve a set of journal blocks in case no
transaction is active.  However, gfs2_log_flush also gets called in
cases where we don't have an active journal, for example, for spectator
mounts.  In that case, trying to reserve blocks would sleep forever, but
we want gfs2_log_flush to be a no-op instead.

Fixes: fe3e397668775 ("gfs2: Rework the log space allocation logic")
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
3 years agoio_uring: remove useless ->startup completion
Pavel Begunkov [Thu, 11 Mar 2021 23:29:36 +0000 (23:29 +0000)]
io_uring: remove useless ->startup completion

We always do complete(&sqd->startup) almost right after sqd->thread
creation, either in the success path or in io_sq_thread_finish(). It's
specifically created not started for us to be able to set some stuff
like sqd->thread and io_uring_alloc_task_context() before following
right after wake_up_new_task().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoio_uring: cancel deferred requests in try_cancel
Pavel Begunkov [Thu, 11 Mar 2021 23:29:35 +0000 (23:29 +0000)]
io_uring: cancel deferred requests in try_cancel

As io_uring_cancel_files() and others let SQO to run between
io_uring_try_cancel_requests(), SQO may generate new deferred requests,
so it's safer to try to cancel them in it.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoMerge tag 'nvme-5.12-2021-03-12' of git://git.infradead.org/nvme into block-5.12
Jens Axboe [Fri, 12 Mar 2021 14:21:15 +0000 (07:21 -0700)]
Merge tag 'nvme-5.12-2021-03-12' of git://git.infradead.org/nvme into block-5.12

Pull NVMe fixes from Christoph:

"nvme fixes for 5.12:

 - one more quirk (Dmitry Monakhov)
 - fix max_zone_append_sectors initialization (Chaitanya Kulkarni)
 - nvme-fc reset/create race fix (James Smart)
 - fix status code on aborts/resets (Hannes Reinecke)
 - fix the CSS check for ZNS namespaces (Chaitanya Kulkarni)
 - fix a use after free in a debug printk in nvme-rdma (Lv Yunlong)"

* tag 'nvme-5.12-2021-03-12' of git://git.infradead.org/nvme:
  nvme-pci: add the DISABLE_WRITE_ZEROES quirk for a Samsung PM1725a
  nvme-rdma: Fix a use after free in nvmet_rdma_write_data_done
  nvme-core: check ctrl css before setting up zns
  nvme-fc: fix racing controller reset and create association
  nvme-fc: return NVME_SC_HOST_ABORTED_CMD when a command has been aborted
  nvme-fc: set NVME_REQ_CANCELLED in nvme_fc_terminate_exchange()
  nvme: add NVME_REQ_CANCELLED flag in nvme_cancel_request()
  nvme: simplify error logic in nvme_validate_ns()
  nvme: set max_zone_append_sectors nvme_revalidate_zones

3 years agogfs2: bypass signal_our_withdraw if no journal
Bob Peterson [Fri, 12 Mar 2021 12:58:54 +0000 (07:58 -0500)]
gfs2: bypass signal_our_withdraw if no journal

Before this patch, function signal_our_withdraw referenced the journal
inode immediately. But corrupt file systems may have some invalid
journals, in which case our attempt to read it in will withdraw and the
resulting signal_our_withdraw would dereference the NULL value.

This patch adds a check to signal_our_withdraw so that if the journal
has not yet been initialized, it simply returns and does the old-style
withdraw.

Thanks, Andy Price, for his analysis.

Reported-by: syzbot+50a8a9cf8127f2c6f5df@syzkaller.appspotmail.com
Fixes: 601ef0d52e96 ("gfs2: Force withdraw to replay journals and wait for it to finish")
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
3 years agoperf/arm_dmc620_pmu: Fix error return code in dmc620_pmu_device_probe()
Wei Yongjun [Fri, 12 Mar 2021 08:04:21 +0000 (08:04 +0000)]
perf/arm_dmc620_pmu: Fix error return code in dmc620_pmu_device_probe()

Fix to return negative error code -ENOMEM from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: 53c218da220c ("driver/perf: Add PMU driver for the ARM DMC-620 memory controller")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Link: https://lore.kernel.org/r/20210312080421.277562-1-weiyongjun1@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
3 years agoobjtool,x86: Fix uaccess PUSHF/POPF validation
Peter Zijlstra [Mon, 8 Mar 2021 14:46:04 +0000 (15:46 +0100)]
objtool,x86: Fix uaccess PUSHF/POPF validation

Commit ab234a260b1f ("x86/pv: Rework arch_local_irq_restore() to not
use popf") replaced "push %reg; popf" with something like: "test
$0x200, %reg; jz 1f; sti; 1:", which breaks the pushf/popf symmetry
that commit ea24213d8088 ("objtool: Add UACCESS validation") relies
on.

The result is:

  drivers/gpu/drm/amd/amdgpu/si.o: warning: objtool: si_common_hw_init()+0xf36: PUSHF stack exhausted

Meanwhile, commit c9c324dc22aa ("objtool: Support stack layout changes
in alternatives") makes that we can actually use stack-ops in
alternatives, which means we can revert 1ff865e343c2 ("x86,smap: Fix
smap_{save,restore}() alternatives").

That in turn means we can limit the PUSHF/POPF handling of
ea24213d8088 to those instructions that are in alternatives.

Fixes: ab234a260b1f ("x86/pv: Rework arch_local_irq_restore() to not use popf")
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/YEY4rIbQYa5fnnEp@hirez.programming.kicks-ass.net
3 years agoopp: Don't drop extra references to OPPs accidentally
Beata Michalska [Thu, 4 Mar 2021 15:07:34 +0000 (15:07 +0000)]
opp: Don't drop extra references to OPPs accidentally

We are required to call dev_pm_opp_put() from outside of the
opp_table->lock as debugfs removal needs to happen lock-less to avoid
circular dependency issues.

commit cf1fac943c63 ("opp: Reduce the size of critical section in
_opp_kref_release()") tried to fix that introducing a new routine
_opp_get_next() which keeps returning OPPs that can be freed by the
callers and this routine shall be called without holding the
opp_table->lock.

Though the commit overlooked the fact that the OPPs can be referenced by
other users as well and this routine will end up dropping references
which were taken by other users and hence freeing the OPPs prematurely.

In effect, other users of the OPPs will end up having invalid pointers
at hand. We didn't see any crash reports earlier as the exact situation
never happened, though it is certainly possible.

We need a way to mark which OPPs are no longer referenced by the OPP
core, so we don't drop extra references to them accidentally.

This commit adds another OPP flag, "removed", which is used to track
this. And now we should never end up dropping extra references to the
OPPs.

Cc: v5.11+ <stable@vger.kernel.org> # v5.11+
Fixes: cf1fac943c63 ("opp: Reduce the size of critical section in _opp_kref_release()")
Signed-off-by: Beata Michalska <beata.michalska@arm.com>
[ Viresh: Almost rewrote entire patch, added new "removed" field,
  rewrote commit log and added the correct Fixes tag. ]
Co-developed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
3 years agoMerge tag 'drm-fixes-2021-03-12-1' of git://anongit.freedesktop.org/drm/drm
Linus Torvalds [Fri, 12 Mar 2021 01:38:49 +0000 (17:38 -0800)]
Merge tag 'drm-fixes-2021-03-12-1' of git://anongit.freedesktop.org/drm/drm

Pull drm fixes from Dave Airlie:
 "Regular fixes for rc3. The i915 pull was based on the rc1 tag so I
  just cherry-picked the single fix from there to avoid it. The misc and
  amd trees seem to be on okay bases.

  It's a bunch of fixes across the tree, amdgpu has most of them a few
  ttm fixes around qxl, and nouveau.

  core:
   - Clear holes when converting compat ioctl's between 32-bits and
     64-bits.

  docs:
   - Use gitlab for drm bugzilla now.

  ttm:
   - Fix ttm page pool accounting.

  fbdev:
   - Fix oops in drm_fbdev_cleanup()

  shmem:
   - Assorted fixes for shmem helpers.

  qxl:
   - unpin qxl bos created as pinned when freeing them, and make ttm
     only warn once on this behavior.
   - Zero head.surface_id correctly in qxl.

  atyfb:
   - Use LCD management for atyfb on PPC_MAC.

  meson:
   - Shutdown kms poll helper in meson correctly.

  nouveau:
   - fix regression in bo syncing

  i915:
   - Wedge the GPU if command parser setup fails

  amdgpu:
   - Fix aux backlight control
   - Add a backlight override parameter
   - Various display fixes
   - PCIe DPM fix for vega
   - Polaris watermark fixes
   - Additional S0ix fix

  radeon:
   - Fix GEM regression
   - Fix AGP dependency handling"

* tag 'drm-fixes-2021-03-12-1' of git://anongit.freedesktop.org/drm/drm: (33 commits)
  drm/nouveau: fix dma syncing for loops (v2)
  drm/i915: Wedge the GPU if command parser setup fails
  drm/compat: Clear bounce structures
  drm/shmem-helpers: vunmap: Don't put pages for dma-buf
  drm: meson_drv add shutdown function
  drm/shmem-helper: Don't remove the offset in vm_area_struct pgoff
  drm/shmem-helper: Check for purged buffers in fault handler
  qxl: Fix uninitialised struct field head.surface_id
  drm/ttm: Fix TTM page pool accounting
  drm/ttm: soften TTM warnings
  drm: Use USB controller's DMA mask when importing dmabufs
  MAINTAINERS: update drm bug reporting URL
  fbdev: atyfb: use LCD management functions for PPC_PMAC also
  fbdev: atyfb: always declare aty_{ld,st}_lcd()
  drm/qxl: fix lockdep issue in qxl_alloc_release_reserved
  drm/qxl: unpin release objects
  drm/fb-helper: only unmap if buffer not null
  drm/amdgpu: fix S0ix handling when the CONFIG_AMD_PMC=m
  drm/radeon: fix AGP dependency
  drm/radeon: also init GEM funcs in radeon_gem_prime_import_sg_table
  ...

3 years agodrm/nouveau: fix dma syncing for loops (v2)
Dave Airlie [Thu, 11 Mar 2021 04:35:27 +0000 (14:35 +1000)]
drm/nouveau: fix dma syncing for loops (v2)

The index variable should only be increased in one place.

Noticed this while trying to track down another oops.

v2: use while loop.

Fixes: f295c8cfec83 ("drm/nouveau: fix dma syncing warning with debugging on.")
Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210311043527.5376-1-airlied@gmail.com
3 years agodrm/i915: Wedge the GPU if command parser setup fails
Tvrtko Ursulin [Tue, 2 Mar 2021 11:42:13 +0000 (11:42 +0000)]
drm/i915: Wedge the GPU if command parser setup fails

Commit 311a50e76a33 ("drm/i915: Add support for mandatory cmdparsing")
introduced mandatory command parsing but setup failures were not
translated into wedging the GPU which was probably the intent.

Possible errors come in two categories. Either the sanity check on
internal tables has failed, which should be caught in CI unless an
affected platform would be missed in testing; or memory allocation failure
happened during driver load, which should be extremely unlikely but for
correctness should still be handled.

v2:
 * Tidy coding style. (Chris)

[airlied: cherry-picked to avoid rc1 base]
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: 311a50e76a33 ("drm/i915: Add support for mandatory cmdparsing")
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris.p.wilson@intel.com>
Reviewed-by: Chris Wilson <chris.p.wilson@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210302114213.1102223-1-tvrtko.ursulin@linux.intel.com
(cherry picked from commit 5a1a659762d35a6dc51047c9127c011303c77b7f)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
3 years agoMerge tag 'amd-drm-fixes-5.12-2021-03-10' of https://gitlab.freedesktop.org/agd5f...
Dave Airlie [Fri, 12 Mar 2021 01:20:02 +0000 (11:20 +1000)]
Merge tag 'amd-drm-fixes-5.12-2021-03-10' of https://gitlab.freedesktop.org/agd5f/linux into drm-fixes

amd-drm-fixes-5.12-2021-03-10:

amdgpu:
- Fix aux backlight control
- Add a backlight override parameter
- Various display fixes
- PCIe DPM fix for vega
- Polaris watermark fixes
- Additional S0ix fix

radeon:
- Fix GEM regression
- Fix AGP dependency handling

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210310221141.3974-1-alexander.deucher@amd.com
3 years agoMerge tag 'drm-misc-fixes-2021-03-11' of git://anongit.freedesktop.org/drm/drm-misc...
Dave Airlie [Fri, 12 Mar 2021 00:19:55 +0000 (10:19 +1000)]
Merge tag 'drm-misc-fixes-2021-03-11' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes

drm-misc-fixes for rc3, rebased on rc2:
- Fix oops in drm_fbdev_cleanup()
- unpin qxl bos created as pinned when freeing them,
  and make ttm only warn once on this behavior.
- Use LCD management for atyfb on PPC_MAC.
- Use gitlab for drm bugzilla now.
- Fix ttm page pool accounting.
- Zero head.surface_id correctly in qxl.
- Assorted fixes for shmem helpers.
- Shutdown kms poll helper in meson correctly.
- Clear holes when converting compat ioctl's between 32-bits and 64-bits.

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/4606f08e-d0e8-c543-5e96-cee2fd728a41@linux.intel.com
3 years agopowerpc/traps: unrecoverable_exception() is not an interrupt handler
Christophe Leroy [Tue, 9 Mar 2021 12:09:26 +0000 (12:09 +0000)]
powerpc/traps: unrecoverable_exception() is not an interrupt handler

unrecoverable_exception() is called from interrupt handlers or
after an interrupt handler has failed.

Make it a standard function to avoid doubling the actions
performed on interrupt entry (e.g.: user time accounting).

Fixes: 3a96570ffceb ("powerpc: convert interrupt handlers to use wrappers")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ae96c59fa2cb7f24a8929c58cfa2c909cb8ff1f1.1615291471.git.christophe.leroy@csgroup.eu