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  1. Apr 07, 2022
    • Alexander Aring's avatar
      dlm: use __le types for options header · d9efd005
      Alexander Aring authored 
      

This patch changes to use __le types directly in the dlm option headers
structures which are casted at the right dlm message buffer positions.

Currently only midcomms.c using those headers which already was calling
endian conversions on-the-fly without using in/out functionality like
other endianness handling in dlm. Using __le types now will hopefully get
useful warnings in future if we do comparison against host byte order
values.

Signed-off-by: default avatarAlexander Aring <aahringo@redhat.com>
Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
      d9efd005
    • Alexander Aring's avatar
      dlm: add __CHECKER__ for false positives · a8449f23
      Alexander Aring authored 
      

This patch will adds #ifndef __CHECKER__ for false positives warnings
about an imbalance lock/unlock srcu handling. Which are shown by running
sparse checks:

fs/dlm/midcomms.c:1065:20: warning: context imbalance in 'dlm_midcomms_get_mhandle' - wrong count at exit

Using __CHECKER__ will tell sparse to ignore these sections.

Those imbalances are false positive because from upper layer it is
always required to call a function in sequence, e.g. if
dlm_midcomms_get_mhandle() is successful there must be a
dlm_midcomms_commit_mhandle() call afterwards.

Signed-off-by: default avatarAlexander Aring <aahringo@redhat.com>
Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
      a8449f23
    • Alexander Aring's avatar
      dlm: move global to static inits · 314a5540
      Alexander Aring authored 
      

Instead of init global module at module loading time we can move the
initialization of those global variables at memory initialization of the
module loader.

Signed-off-by: default avatarAlexander Aring <aahringo@redhat.com>
Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
      314a5540
    • Alexander Aring's avatar
      dlm: remove unnecessary INIT_LIST_HEAD() · 16d58904
      Alexander Aring authored 
      

There is no need to call INIT_LIST_HEAD() when it's set directly
afterwards by list_add_tail().

Reported-by: default avatarAndreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: default avatarAlexander Aring <aahringo@redhat.com>
Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
      16d58904
    • Alexander Aring's avatar
      dlm: improve plock logging if interrupted · bcfad426
      Alexander Aring authored 
      

This patch changes the log level if a plock is removed when interrupted
from debug to info. Additional it signals now that the plock entity was
removed to let the user know what's happening.

If on a dev_write() a pending plock cannot be find it will signal that
it might have been removed because wait interruption.

Before this patch there might be a "dev_write no op ..." info message
and the users can only guess that the plock was removed before because
the wait interruption. To be sure that is the case we log both messages
on the same log level.

Let both message be logged on info layer because it should not happened
a lot and if it happens it should be clear why the op was not found.

Signed-off-by: default avatarAlexander Aring <aahringo@redhat.com>
Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
      bcfad426
    • Alexander Aring's avatar
      dlm: rearrange async condition return · a800ba77
      Alexander Aring authored 
      

This patch moves the return of FILE_LOCK_DEFERRED a little bit earlier
than checking afterwards again if the request was an asynchronous request.

Signed-off-by: default avatarAlexander Aring <aahringo@redhat.com>
Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
      a800ba77
    • Alexander Aring's avatar
      dlm: cleanup plock_op vs plock_xop · bcbb4ba6
      Alexander Aring authored 
      

Lately the different casting between plock_op and plock_xop and list
holders which was involved showed some issues which were hard to see.
This patch removes the "plock_xop" structure and introduces a
"struct plock_async_data". This structure will be set in "struct plock_op"
in case of asynchronous lock handling as the original "plock_xop" was
made for. There is no need anymore to cast pointers around for
additional fields in case of asynchronous lock handling.  As disadvantage
another allocation was introduces but only needed in the asynchronous
case which is currently only used in combination with nfs lockd.

Signed-off-by: default avatarAlexander Aring <aahringo@redhat.com>
Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
      bcbb4ba6
    • Alexander Aring's avatar
      dlm: replace sanity checks with WARN_ON · a559790c
      Alexander Aring authored 
      

There are several sanity checks and recover handling if they occur in
the dlm plock handling. From my understanding those operation can't run
in parallel with any list manipulation which involved setting the list
holder of plock_op, if so we have a bug which this sanity check will
warn about. Previously if such sanity check occurred the dlm plock
handling was trying to recover from it by deleting the plock_op from a
list which the holder was set to. However there is a bug in the dlm
plock handling if this case ever happens. To make such bugs are more
visible for further investigations we add a WARN_ON() on those sanity
checks and remove the recovering handling because other possible side
effects.

Signed-off-by: default avatarAlexander Aring <aahringo@redhat.com>
Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
      a559790c
    • Alexander Aring's avatar
      dlm: fix plock invalid read · 42252d0d
      Alexander Aring authored 
      This patch fixes an invalid read showed by KASAN. A unlock will allocate a
"struct plock_op" and a followed send_op() will append it to a global
send_list data structure. In some cases a followed dev_read() moves it
to recv_list and dev_write() will cast it to "struct plock_xop" and access
fields which are only available in those structures. At this point an
invalid read happens by accessing those fields.

To fix this issue the "callback" field is moved to "struct plock_op" to
indicate that a cast to "plock_xop" is allowed and does the additional
"plock_xop" handling if set.

Example of the KASAN output which showed the invalid read:

[ 2064.296453] ==================================================================
[ 2064.304852] BUG: KASAN: slab-out-of-bounds in dev_write+0x52b/0x5a0 [dlm]
[ 2064.306491] Read of size 8 at addr ffff88800ef227d8 by task dlm_controld/7484
[ 2064.308168]
[ 2064.308575] CPU: 0 PID: 7484 Comm: dlm_controld Kdump: loaded Not tainted 5.14.0+ #9
[ 2064.310292] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[ 2064.311618] Call Trace:
[ 2064.312218]  dump_stack_lvl+0x56/0x7b
[ 2064.313150]  print_address_description.constprop.8+0x21/0x150
[ 2064.314578]  ? dev_write+0x52b/0x5a0 [dlm]
[ 2064.315610]  ? dev_write+0x52b/0x5a0 [dlm]
[ 2064.316595]  kasan_report.cold.14+0x7f/0x11b
[ 2064.317674]  ? dev_write+0x52b/0x5a0 [dlm]
[ 2064.318687]  dev_write+0x52b/0x5a0 [dlm]
[ 2064.319629]  ? dev_read+0x4a0/0x4a0 [dlm]
[ 2064.320713]  ? bpf_lsm_kernfs_init_security+0x10/0x10
[ 2064.321926]  vfs_write+0x17e/0x930
[ 2064.322769]  ? __fget_light+0x1aa/0x220
[ 2064.323753]  ksys_write+0xf1/0x1c0
[ 2064.324548]  ? __ia32_sys_read+0xb0/0xb0
[ 2064.325464]  do_syscall_64+0x3a/0x80
[ 2064.326387]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 2064.327606] RIP: 0033:0x7f807e4ba96f
[ 2064.328470] Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 39 87 f8 ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 7c 87 f8 ff 48
[ 2064.332902] RSP: 002b:00007ffd50cfe6e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
[ 2064.334658] RAX: ffffffffffffffda RBX: 000055cc3886eb30 RCX: 00007f807e4ba96f
[ 2064.336275] RDX: 0000000000000040 RSI: 00007ffd50cfe7e0 RDI: 0000000000000010
[ 2064.337980] RBP: 00007ffd50cfe7e0 R08: 0000000000000000 R09: 0000000000000001
[ 2064.339560] R10: 000055cc3886eb30 R11: 0000000000000293 R12: 000055cc3886eb80
[ 2064.341237] R13: 000055cc3886eb00 R14: 000055cc3886f590 R15: 0000000000000001
[ 2064.342857]
[ 2064.343226] Allocated by task 12438:
[ 2064.344057]  kasan_save_stack+0x1c/0x40
[ 2064.345079]  __kasan_kmalloc+0x84/0xa0
[ 2064.345933]  kmem_cache_alloc_trace+0x13b/0x220
[ 2064.346953]  dlm_posix_unlock+0xec/0x720 [dlm]
[ 2064.348811]  do_lock_file_wait.part.32+0xca/0x1d0
[ 2064.351070]  fcntl_setlk+0x281/0xbc0
[ 2064.352879]  do_fcntl+0x5e4/0xfe0
[ 2064.354657]  __x64_sys_fcntl+0x11f/0x170
[ 2064.356550]  do_syscall_64+0x3a/0x80
[ 2064.358259]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 2064.360745]
[ 2064.361511] Last potentially related work creation:
[ 2064.363957]  kasan_save_stack+0x1c/0x40
[ 2064.365811]  __kasan_record_aux_stack+0xaf/0xc0
[ 2064.368100]  call_rcu+0x11b/0xf70
[ 2064.369785]  dlm_process_incoming_buffer+0x47d/0xfd0 [dlm]
[ 2064.372404]  receive_from_sock+0x290/0x770 [dlm]
[ 2064.374607]  process_recv_sockets+0x32/0x40 [dlm]
[ 2064.377290]  process_one_work+0x9a8/0x16e0
[ 2064.379357]  worker_thread+0x87/0xbf0
[ 2064.381188]  kthread+0x3ac/0x490
[ 2064.383460]  ret_from_fork+0x22/0x30
[ 2064.385588]
[ 2064.386518] Second to last potentially related work creation:
[ 2064.389219]  kasan_save_stack+0x1c/0x40
[ 2064.391043]  __kasan_record_aux_stack+0xaf/0xc0
[ 2064.393303]  call_rcu+0x11b/0xf70
[ 2064.394885]  dlm_process_incoming_buffer+0x47d/0xfd0 [dlm]
[ 2064.397694]  receive_from_sock+0x290/0x770 [dlm]
[ 2064.399932]  process_recv_sockets+0x32/0x40 [dlm]
[ 2064.402180]  process_one_work+0x9a8/0x16e0
[ 2064.404388]  worker_thread+0x87/0xbf0
[ 2064.406124]  kthread+0x3ac/0x490
[ 2064.408021]  ret_from_fork+0x22/0x30
[ 2064.409834]
[ 2064.410599] The buggy address belongs to the object at ffff88800ef22780
[ 2064.410599]  which belongs to the cache kmalloc-96 of size 96
[ 2064.416495] The buggy address is located 88 bytes inside of
[ 2064.416495]  96-byte region [ffff88800ef22780, ffff88800ef227e0)
[ 2064.422045] The buggy address belongs to the page:
[ 2064.424635] page:00000000b6bef8bc refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xef22
[ 2064.428970] flags: 0xfffffc0000200(slab|node=0|zone=1|lastcpupid=0x1fffff)
[ 2064.432515] raw: 000fffffc0000200 ffffea0000d68b80 0000001400000014 ffff888001041780
[ 2064.436110] raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000
[ 2064.439813] page dumped because: kasan: bad access detected
[ 2064.442548]
[ 2064.443310] Memory state around the buggy address:
[ 2064.445988]  ffff88800ef22680: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
[ 2064.449444]  ffff88800ef22700: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
[ 2064.452941] >ffff88800ef22780: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
[ 2064.456383]                                                     ^
[ 2064.459386]  ffff88800ef22800: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
[ 2064.462788]  ffff88800ef22880: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
[ 2064.466239] ==================================================================

reproducer in python:

import argparse
import struct
import fcntl
import os

parser = argparse.ArgumentParser()

parser.add_argument('-f', '--file',
		    help='file to use fcntl, must be on dlm lock filesystem e.g. gfs2')

args = parser.parse_args()

f = open(args.file, 'wb+')

lockdata = struct.pack('hhllhh', fcntl.F_WRLCK,0,0,0,0,0)
fcntl.fcntl(f, fcntl.F_SETLK, lockdata)
lockdata = struct.pack('hhllhh', fcntl.F_UNLCK,0,0,0,0,0)
fcntl.fcntl(f, fcntl.F_SETLK, lockdata)

Fixes: 586759f0

 ("gfs2: nfs lock support for gfs2")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarAndreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: default avatarAlexander Aring <aahringo@redhat.com>
Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
      42252d0d
    • Alexander Aring's avatar
      dlm: fix missing check in validate_lock_args · 67e4d8c5
      Alexander Aring authored 
      

This patch adds a additional check if lkb->lkb_wait_count is non zero as
it is done in validate_unlock_args() to check if any operation is in
progress. While on it add a comment taken from validate_unlock_args() to
signal what the check is doing.

There might be no changes because if lkb->lkb_wait_type is non zero
implies that lkb->lkb_wait_count is non zero. However we should add the
check as it does validate_unlock_args().

Signed-off-by: default avatarAlexander Aring <aahringo@redhat.com>
Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
      67e4d8c5
    • Dan Carpenter's avatar
      dlm: uninitialized variable on error in dlm_listen_for_all() · 1f4f1084
      Dan Carpenter authored 
      The "sock" variable is not initialized on this error path.

Cc: stable@vger.kernel.org
Fixes: 2dc6b115

 ("fs: dlm: introduce generic listen")
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarAlexander Aring <aahringo@redhat.com>
Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
      1f4f1084
  3. Apr 04, 2022
    • Linus Torvalds's avatar
      Linux 5.18-rc1 · 31231092
      Linus Torvalds authored
      31231092
    • Linus Torvalds's avatar
      Merge tag 'trace-v5.18-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace · 09bb8856
      Linus Torvalds authored 
      Pull more tracing updates from Steven Rostedt:

 - Rename the staging files to give them some meaning. Just
   stage1,stag2,etc, does not show what they are for

 - Check for NULL from allocation in bootconfig

 - Hold event mutex for dyn_event call in user events

 - Mark user events to broken (to work on the API)

 - Remove eBPF updates from user events

 - Remove user events from uapi header to keep it from being installed.

 - Move ftrace_graph_is_dead() into inline as it is called from hot
   paths and also convert it into a static branch.

* tag 'trace-v5.18-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Move user_events.h temporarily out of include/uapi
  ftrace: Make ftrace_graph_is_dead() a static branch
  tracing: Set user_events to BROKEN
  tracing/user_events: Remove eBPF interfaces
  tracing/user_events: Hold event_mutex during dyn_event_add
  proc: bootconfig: Add null pointer check
  tracing: Rename the staging files for trace_events
      09bb8856
    • Linus Torvalds's avatar
      Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux · 34a53ff9
      Linus Torvalds authored 
      Pull clk fix from Stephen Boyd:
 "A single revert to fix a boot regression seen when clk_put() started
  dropping rate range requests. It's best to keep various systems
  booting so we'll kick this out and try again next time"

* tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux:
  Revert "clk: Drop the rate range on clk_put()"
      34a53ff9
    • Linus Torvalds's avatar
      Merge tag 'x86-urgent-2022-04-03' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 8b5656bc
      Linus Torvalds authored 
      Pull x86 fixes from Thomas Gleixner:
 "A set of x86 fixes and updates:

   - Make the prctl() for enabling dynamic XSTATE components correct so
     it adds the newly requested feature to the permission bitmap
     instead of overwriting it. Add a selftest which validates that.

   - Unroll string MMIO for encrypted SEV guests as the hypervisor
     cannot emulate it.

   - Handle supervisor states correctly in the FPU/XSTATE code so it
     takes the feature set of the fpstate buffer into account. The
     feature sets can differ between host and guest buffers. Guest
     buffers do not contain supervisor states. So far this was not an
     issue, but with enabling PASID it needs to be handled in the buffer
     offset calculation and in the permission bitmaps.

   - Avoid a gazillion of repeated CPUID invocations in by caching the
     values early in the FPU/XSTATE code.

   - Enable CONFIG_WERROR in x86 defconfig.

   - Make the X86 defconfigs more useful by adapting them to Y2022
     reality"

* tag 'x86-urgent-2022-04-03' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/fpu/xstate: Consolidate size calculations
  x86/fpu/xstate: Handle supervisor states in XSTATE permissions
  x86/fpu/xsave: Handle compacted offsets correctly with supervisor states
  x86/fpu: Cache xfeature flags from CPUID
  x86/fpu/xsave: Initialize offset/size cache early
  x86/fpu: Remove unused supervisor only offsets
  x86/fpu: Remove redundant XCOMP_BV initialization
  x86/sev: Unroll string mmio with CC_ATTR_GUEST_UNROLL_STRING_IO
  x86/config: Make the x86 defconfigs a bit more usable
  x86/defconfig: Enable WERROR
  selftests/x86/amx: Update the ARCH_REQ_XCOMP_PERM test
  x86/fpu/xstate: Fix the ARCH_REQ_XCOMP_PERM implementation
      8b5656bc
    • Linus Torvalds's avatar
      Merge tag 'core-urgent-2022-04-03' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · e235f419
      Linus Torvalds authored 
      Pull RT signal fix from Thomas Gleixner:
 "Revert the RT related signal changes. They need to be reworked and
  generalized"

* tag 'core-urgent-2022-04-03' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Revert "signal, x86: Delay calling signals in atomic on RT enabled kernels"
      e235f419
    • Linus Torvalds's avatar
      Merge tag 'dma-mapping-5.18-1' of git://git.infradead.org/users/hch/dma-mapping · 63d12cc3
      Linus Torvalds authored 
      Pull more dma-mapping updates from Christoph Hellwig:

 - fix a regression in dma remap handling vs AMD memory encryption (me)

 - finally kill off the legacy PCI DMA API (Christophe JAILLET)

* tag 'dma-mapping-5.18-1' of git://git.infradead.org/users/hch/dma-mapping:
  dma-mapping: move pgprot_decrypted out of dma_pgprot
  PCI/doc: cleanup references to the legacy PCI DMA API
  PCI: Remove the deprecated "pci-dma-compat.h" API
      63d12cc3
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm · 5dee8721
      Linus Torvalds authored 
      Pull ARM fixes from Russell King:

 - avoid unnecessary rebuilds for library objects

 - fix return value of __setup handlers

 - fix invalid input check for "crashkernel=" kernel option

 - silence KASAN warnings in unwind_frame

* tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 9191/1: arm/stacktrace, kasan: Silence KASAN warnings in unwind_frame()
  ARM: 9190/1: kdump: add invalid input check for 'crashkernel=0'
  ARM: 9187/1: JIVE: fix return value of __setup handler
  ARM: 9189/1: decompressor: fix unneeded rebuilds of library objects
      5dee8721
  5. Apr 03, 2022
  7. Apr 02, 2022