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  1. Jun 26, 2020
    • Junxiao Bi's avatar
      ocfs2: fix value of OCFS2_INVALID_SLOT · 9277f833
      Junxiao Bi authored 
      In the ocfs2 disk layout, slot number is 16 bits, but in ocfs2
implementation, slot number is 32 bits.  Usually this will not cause any
issue, because slot number is converted from u16 to u32, but
OCFS2_INVALID_SLOT was defined as -1, when an invalid slot number from
disk was obtained, its value was (u16)-1, and it was converted to u32.
Then the following checking in get_local_system_inode will be always
skipped:

 static struct inode **get_local_system_inode(struct ocfs2_super *osb,
                                               int type,
                                               u32 slot)
 {
 	BUG_ON(slot == OCFS2_INVALID_SLOT);
	...
 }

Link: http://lkml.kernel.org/r/20200616183829.87211-5-junxiao.bi@oracle.com


Signed-off-by: default avatarJunxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: default avatarJoseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9277f833
    • Junxiao Bi's avatar
      ocfs2: fix panic on nfs server over ocfs2 · e5a15e17
      Junxiao Bi authored 
      The following kernel panic was captured when running nfs server over
ocfs2, at that time ocfs2_test_inode_bit() was checking whether one
inode locating at "blkno" 5 was valid, that is ocfs2 root inode, its
"suballoc_slot" was OCFS2_INVALID_SLOT(65535) and it was allocted from
//global_inode_alloc, but here it wrongly assumed that it was got from per
slot inode alloctor which would cause array overflow and trigger kernel
panic.

  BUG: unable to handle kernel paging request at 0000000000001088
  IP: [<ffffffff816f6898>] _raw_spin_lock+0x18/0xf0
  PGD 1e06ba067 PUD 1e9e7d067 PMD 0
  Oops: 0002 [#1] SMP
  CPU: 6 PID: 24873 Comm: nfsd Not tainted 4.1.12-124.36.1.el6uek.x86_64 #2
  Hardware name: Huawei CH121 V3/IT11SGCA1, BIOS 3.87 02/02/2018
  RIP: _raw_spin_lock+0x18/0xf0
  RSP: e02b:ffff88005ae97908  EFLAGS: 00010206
  RAX: ffff88005ae98000 RBX: 0000000000001088 RCX: 0000000000000000
  RDX: 0000000000020000 RSI: 0000000000000009 RDI: 0000000000001088
  RBP: ffff88005ae97928 R08: 0000000000000000 R09: ffff880212878e00
  R10: 0000000000007ff0 R11: 0000000000000000 R12: 0000000000001088
  R13: ffff8800063c0aa8 R14: ffff8800650c27d0 R15: 000000000000ffff
  FS:  0000000000000000(0000) GS:ffff880218180000(0000) knlGS:ffff880218180000
  CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000000001088 CR3: 00000002033d0000 CR4: 0000000000042660
  Call Trace:
    igrab+0x1e/0x60
    ocfs2_get_system_file_inode+0x63/0x3a0 [ocfs2]
    ocfs2_test_inode_bit+0x328/0xa00 [ocfs2]
    ocfs2_get_parent+0xba/0x3e0 [ocfs2]
    reconnect_path+0xb5/0x300
    exportfs_decode_fh+0xf6/0x2b0
    fh_verify+0x350/0x660 [nfsd]
    nfsd4_putfh+0x4d/0x60 [nfsd]
    nfsd4_proc_compound+0x3d3/0x6f0 [nfsd]
    nfsd_dispatch+0xe0/0x290 [nfsd]
    svc_process_common+0x412/0x6a0 [sunrpc]
    svc_process+0x123/0x210 [sunrpc]
    nfsd+0xff/0x170 [nfsd]
    kthread+0xcb/0xf0
    ret_from_fork+0x61/0x90
  Code: 83 c2 02 0f b7 f2 e8 18 dc 91 ff 66 90 eb bf 0f 1f 40 00 55 48 89 e5 41 56 41 55 41 54 53 0f 1f 44 00 00 48 89 fb ba 00 00 02 00 <f0> 0f c1 17 89 d0 45 31 e4 45 31 ed c1 e8 10 66 39 d0 41 89 c6
  RIP   _raw_spin_lock+0x18/0xf0
  CR2: 0000000000001088
  ---[ end trace 7264463cd1aac8f9 ]---
  Kernel panic - not syncing: Fatal exception

Link: http://lkml.kernel.org/r/20200616183829.87211-4-junxiao.bi@oracle.com


Signed-off-by: default avatarJunxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: default avatarJoseph Qi <joseph.qi@linux.alibaba.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e5a15e17
    • Junxiao Bi's avatar
      ocfs2: load global_inode_alloc · 7569d3c7
      Junxiao Bi authored 
      Set global_inode_alloc as OCFS2_FIRST_ONLINE_SYSTEM_INODE, that will
make it load during mount.  It can be used to test whether some
global/system inodes are valid.  One use case is that nfsd will test
whether root inode is valid.

Link: http://lkml.kernel.org/r/20200616183829.87211-3-junxiao.bi@oracle.com


Signed-off-by: default avatarJunxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: default avatarJoseph Qi <joseph.qi@linux.alibaba.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7569d3c7
    • Junxiao Bi's avatar
      ocfs2: avoid inode removal while nfsd is accessing it · 4cd9973f
      Junxiao Bi authored 
      Patch series "ocfs2: fix nfsd over ocfs2 issues", v2.

This is a series of patches to fix issues on nfsd over ocfs2.  patch 1
is to avoid inode removed while nfsd access it patch 2 & 3 is to fix a
panic issue.

This patch (of 4):

When nfsd is getting file dentry using handle or parent dentry of some
dentry, one cluster lock is used to avoid inode removed from other node,
but it still could be removed from local node, so use a rw lock to avoid
this.

Link: http://lkml.kernel.org/r/20200616183829.87211-1-junxiao.bi@oracle.com
Link: http://lkml.kernel.org/r/20200616183829.87211-2-junxiao.bi@oracle.com


Signed-off-by: default avatarJunxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: default avatarJoseph Qi <joseph.qi@linux.alibaba.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4cd9973f
    • Lianbo Jiang's avatar
      kexec: do not verify the signature without the lockdown or mandatory signature · fd7af71b
      Lianbo Jiang authored 
      Signature verification is an important security feature, to protect
system from being attacked with a kernel of unknown origin.  Kexec
rebooting is a way to replace the running kernel, hence need be secured
carefully.

In the current code of handling signature verification of kexec kernel,
the logic is very twisted.  It mixes signature verification, IMA
signature appraising and kexec lockdown.

If there is no KEXEC_SIG_FORCE, kexec kernel image doesn't have one of
signature, the supported crypto, and key, we don't think this is wrong,
Unless kexec lockdown is executed.  IMA is considered as another kind of
signature appraising method.

If kexec kernel image has signature/crypto/key, it has to go through the
signature verification and pass.  Otherwise it's seen as verification
failure, and won't be loaded.

Seems kexec kernel image with an unqualified signature is even worse
than those w/o signature at all, this sounds very unreasonable.  E.g.
If people get a unsigned kernel to load, or a kernel signed with expired
key, which one is more dangerous?

So, here, let's simplify the logic to improve code readability.  If the
KEXEC_SIG_FORCE enabled or kexec lockdown enabled, signature
verification is mandated.  Otherwise, we lift the bar for any kernel
image.

Link: http://lkml.kernel.org/r/20200602045952.27487-1-lijiang@redhat.com


Signed-off-by: default avatarLianbo Jiang <lijiang@redhat.com>
Reviewed-by: default avatarJiri Bohac <jbohac@suse.cz>
Acked-by: default avatarDave Young <dyoung@redhat.com>
Acked-by: default avatarBaoquan He <bhe@redhat.com>
Cc: James Morris <jmorris@namei.org>
Cc: Matthew Garrett <mjg59@google.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      fd7af71b
    • Vlastimil Babka's avatar
      mm, compaction: make capture control handling safe wrt interrupts · b9e20f0d
      Vlastimil Babka authored 
      Hugh reports:

 "While stressing compaction, one run oopsed on NULL capc->cc in
  __free_one_page()'s task_capc(zone): compact_zone_order() had been
  interrupted, and a page was being freed in the return from interrupt.

  Though you would not expect it from the source, both gccs I was using
  (4.8.1 and 7.5.0) had chosen to compile compact_zone_order() with the
  ".cc = &cc" implemented by mov %rbx,-0xb0(%rbp) immediately before
  callq compact_zone - long after the "current->capture_control =
  &capc". An interrupt in between those finds capc->cc NULL (zeroed by
  an earlier rep stos).

  This could presumably be fixed by a barrier() before setting
  current->capture_control in compact_zone_order(); but would also need
  more care on return from compact_zone(), in order not to risk leaking
  a page captured by interrupt just before capture_control is reset.

  Maybe that is the preferable fix, but I felt safer for task_capc() to
  exclude the rather surprising possibility of capture at interrupt
  time"

I have checked that gcc10 also behaves the same.

The advantage of fix in compact_zone_order() is that we don't add
another test in the page freeing hot path, and that it might prevent
future problems if we stop exposing pointers to uninitialized structures
in current task.

So this patch implements the suggestion for compact_zone_order() with
barrier() (and WRITE_ONCE() to prevent store tearing) for setting
current->capture_control, and prevents page leaking with
WRITE_ONCE/READ_ONCE in the proper order.

Link: http://lkml.kernel.org/r/20200616082649.27173-1-vbabka@suse.cz
Fixes: 5e1f0f09

 ("mm, compaction: capture a page under direct compaction")
Signed-off-by: default avatarVlastimil Babka <vbabka@suse.cz>
Reported-by: default avatarHugh Dickins <hughd@google.com>
Suggested-by: default avatarHugh Dickins <hughd@google.com>
Acked-by: default avatarHugh Dickins <hughd@google.com>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Li Wang <liwang@redhat.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: <stable@vger.kernel.org>	[5.1+]
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b9e20f0d
    • Michal Hocko's avatar
      mm: do_swap_page(): fix up the error code · 545b1b07
      Michal Hocko authored 
      do_swap_page() returns error codes from the VM_FAULT* space.  try_charge()
might return -ENOMEM, though, and then do_swap_page() simply returns 0
which means a success.

We almost never return ENOMEM for GFP_KERNEL single page charge.  Except
for async OOM handling (oom_disabled v1).  So this needs translation to
VM_FAULT_OOM otherwise the the page fault path will not notify the
userspace and wait for an action.

Link: http://lkml.kernel.org/r/20200617090238.GL9499@dhcp22.suse.cz
Fixes: 4c6355b2

 ("mm: memcontrol: charge swapin pages on instantiation")
Signed-off-by: default avatarMichal Hocko <mhocko@suse.com>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Roman Gushchin <guro@fb.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      545b1b07
    • Stafford Horne's avatar
      openrisc: fix boot oops when DEBUG_VM is enabled · 313a5257
      Stafford Horne authored 
      Since v5.8-rc1 OpenRISC Linux fails to boot when DEBUG_VM is enabled.
This has been bisected to commit 42fc5414 ("mmap locking API: add
mmap_assert_locked() and mmap_assert_write_locked()").

The added locking checks exposed the issue that OpenRISC was not taking
this mmap lock when during page walks for DMA operations.  This patch
locks and unlocks the mmap lock for page walking.

Link: http://lkml.kernel.org/r/20200617090247.1680188-1-shorne@gmail.com
Fixes: 42fc5414

 ("mmap locking API: add mmap_assert_locked() and mmap_assert_write_locked()"
Signed-off-by: default avatarStafford Horne <shorne@gmail.com>
Reviewed-by: default avatarMichel Lespinasse <walken@google.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Steven Price <steven.price@arm.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      313a5257
    • Linus Torvalds's avatar
      Merge tag 's390-5.8-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux · 908f7d12
      Linus Torvalds authored 
      Pull s390 fixes from Heiko Carstens:

 - Fix kernel crash on system call single stepping.

 - Make sure early program check handler is executed with DAT on to
   avoid an endless program check loop.

 - Add __GFP_NOWARN flag to debug feature to avoid user triggerable
   allocation failure messages.

* tag 's390-5.8-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/debug: avoid kernel warning on too large number of pages
  s390/kasan: fix early pgm check handler execution
  s390: fix system call single stepping
      908f7d12
    • Linus Torvalds's avatar
      Merge tag 'sound-5.8-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound · a4d3712b
      Linus Torvalds authored 
      Pull sound fixes from Takashi Iwai:
 "A collection of small fixes gathered in the last two weeks.

  The major changes here are fixes for the recent DPCM regressions found
  on i.MX and Qualcomm platforms and fixes for resource leaks in ASoC
  DAI registrations.

  Other than those are mostly device-specific fixes including the usual
  USB- and HD-audio quirks, and a fix for syzkaller case and ID updates
  for new Intel platforms"

* tag 'sound-5.8-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (32 commits)
  ALSA: usb-audio: Fix OOB access of mixer element list
  ALSA: usb-audio: add quirk for Samsung USBC Headset (AKG)
  ALSA: usb-audio: Add registration quirk for Kingston HyperX Cloud Flight S
  ASoC: rockchip: Fix a reference count leak.
  ASoC: amd: closing specific instance.
  ALSA: hda: Intel: add missing PCI IDs for ICL-H, TGL-H and EKL
  ASoC: hdac_hda: fix memleak with regmap not freed on remove
  ASoC: SOF: Intel: add PCI IDs for ICL-H and TGL-H
  ASoC: SOF: Intel: add PCI ID for CometLake-S
  ASoC: Intel: SOF: merge COMETLAKE_LP and COMETLAKE_H
  ALSA: hda/realtek: Add mute LED and micmute LED support for HP systems
  ALSA: usb-audio: Fix potential use-after-free of streams
  ALSA: hda/realtek - Add quirk for MSI GE63 laptop
  ASoC: fsl_ssi: Fix bclk calculation for mono channel
  ASoC: SOF: Intel: hda: Clear RIRB status before reading WP
  ASoC: rt1015: Update rt1015 default register value according to spec modification.
  ASoC: qcom: common: set correct directions for dailinks
  ASoc: q6afe: add support to get port direction
  ASoC: soc-pcm: fix checks for multi-cpu FE dailinks
  ASoC: rt5682: Let dai clks be registered whether mclk exists or not
  ...
      a4d3712b
  3. Jun 25, 2020
  5. Jun 24, 2020
    • Takashi Iwai's avatar
      ALSA: usb-audio: Fix OOB access of mixer element list · 220345e9
      Takashi Iwai authored 
      

The USB-audio mixer code holds a linked list of usb_mixer_elem_list,
and several operations are performed for each mixer element.  A few of
them (snd_usb_mixer_notify_id() and snd_usb_mixer_interrupt_v2())
assume each mixer element being a usb_mixer_elem_info object that is a
subclass of usb_mixer_elem_list, cast via container_of() and access it
members.  This may result in an out-of-bound access when a
non-standard list element has been added, as spotted by syzkaller
recently.

This patch adds a new field, is_std_info, in usb_mixer_elem_list to
indicate that the element is the usb_mixer_elem_info type or not, and
skip the access to such an element if needed.

Reported-by: default avatar <syzbot+fb14314433463ad51625@syzkaller.appspotmail.com>
Reported-by: default avatar <syzbot+2405ca3401e943c538b5@syzkaller.appspotmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200624122340.9615-1-tiwai@suse.de


Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      220345e9
    • Gao Xiang's avatar
      erofs: fix partially uninitialized misuse in z_erofs_onlinepage_fixup · 3c597282
      Gao Xiang authored 
      

Hongyu reported "id != index" in z_erofs_onlinepage_fixup() with
specific aarch64 environment easily, which wasn't shown before.

After digging into that, I found that high 32 bits of page->private
was set to 0xaaaaaaaa rather than 0 (due to z_erofs_onlinepage_init
behavior with specific compiler options). Actually we only use low
32 bits to keep the page information since page->private is only 4
bytes on most 32-bit platforms. However z_erofs_onlinepage_fixup()
uses the upper 32 bits by mistake.

Let's fix it now.

Reported-and-tested-by: default avatarHongyu Jin <hongyu.jin@unisoc.com>
Fixes: 3883a79a

 ("staging: erofs: introduce VLE decompression support")
Cc: <stable@vger.kernel.org> # 4.19+
Reviewed-by: default avatarChao Yu <yuchao0@huawei.com>
Link: https://lore.kernel.org/r/20200618234349.22553-1-hsiangkao@aol.com


Signed-off-by: default avatarGao Xiang <hsiangkao@redhat.com>
      3c597282
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm · 26e122e9
      Linus Torvalds authored 
      Pull kvm fixes from Paolo Bonzini:
 "All bugfixes except for a couple cleanup patches"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: VMX: Remove vcpu_vmx's defunct copy of host_pkru
  KVM: x86: allow TSC to differ by NTP correction bounds without TSC scaling
  KVM: X86: Fix MSR range of APIC registers in X2APIC mode
  KVM: VMX: Stop context switching MSR_IA32_UMWAIT_CONTROL
  KVM: nVMX: Plumb L2 GPA through to PML emulation
  KVM: x86/mmu: Avoid mixing gpa_t with gfn_t in walk_addr_generic()
  KVM: LAPIC: ensure APIC map is up to date on concurrent update requests
  kvm: lapic: fix broken vcpu hotplug
  Revert "KVM: VMX: Micro-optimize vmexit time when not exposing PMU"
  KVM: VMX: Add helpers to identify interrupt type from intr_info
  kvm/svm: disable KCSAN for svm_vcpu_run()
  KVM: MIPS: Fix a build error for !CPU_LOONGSON64
      26e122e9
    • Linus Torvalds's avatar
      Merge tag 'for-5.8-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux · 3e08a952
      Linus Torvalds authored 
      Pull btrfs fixes from David Sterba:
 "A number of fixes, located in two areas, one performance fix and one
  fixup for better integration with another patchset.

   - bug fixes in nowait aio:
       - fix snapshot creation hang after nowait-aio was used
       - fix failure to write to prealloc extent past EOF
       - don't block when extent range is locked

   - block group fixes:
       - relocation failure when scrub runs in parallel
       - refcount fix when removing fails
       - fix race between removal and creation
       - space accounting fixes

   - reinstante fast path check for log tree at unlink time, fixes
     performance drop up to 30% in REAIM

   - kzfree/kfree fixup to ease treewide patchset renaming kzfree"

* tag 'for-5.8-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: use kfree() in btrfs_ioctl_get_subvol_info()
  btrfs: fix RWF_NOWAIT writes blocking on extent locks and waiting for IO
  btrfs: fix RWF_NOWAIT write not failling when we need to cow
  btrfs: fix failure of RWF_NOWAIT write into prealloc extent beyond eof
  btrfs: fix hang on snapshot creation after RWF_NOWAIT write
  btrfs: check if a log root exists before locking the log_mutex on unlink
  btrfs: fix bytes_may_use underflow when running balance and scrub in parallel
  btrfs: fix data block group relocation failure due to concurrent scrub
  btrfs: fix race between block group removal and block group creation
  btrfs: fix a block group ref counter leak after failure to remove block group
      3e08a952
  7. Jun 23, 2020