Currently, __note_gp_changes() checks to see if the rcu_node structure's
->gp_seq_needed is greater than or equal to that of the rcu_data
structure, and if so, updates the rcu_data structure's ->gp_seq_needed
field. This results in a useless store in the case where the two fields
are equal.
This commit therefore carries out this store only in the case where the
rcu_node structure's ->gp_seq_needed is strictly greater than that of
the rcu_data structure.
Signed-off-by: "Zhang, Jun" <jun.zhang@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Link: https://lkml.kernel.org/r/88DC34334CA3444C85D647DBFA962C2735AD5F77@SHSMSX104.ccr.corp.intel.com
The rcu_gp_kthread_wake() function is invoked when it might be necessary
to wake the RCU grace-period kthread. Because self-wakeups are normally
a useless waste of CPU cycles, if rcu_gp_kthread_wake() is invoked from
this kthread, it naturally refuses to do the wakeup.
Unfortunately, natural though it might be, this heuristic fails when
rcu_gp_kthread_wake() is invoked from an interrupt or softirq handler
that interrupted the grace-period kthread just after the final check of
the wait-event condition but just before the schedule() call. In this
case, a wakeup is required, even though the call to rcu_gp_kthread_wake()
is within the RCU grace-period kthread's context. Failing to provide
this wakeup can result in grace periods failing to start, which in turn
results in out-of-memory conditions.
This race window is quite narrow, but it actually did happen during real
testing. It would of course need to be fixed even if it was strictly
theoretical in nature.
This patch does not Cc stable because it does not apply cleanly to
earlier kernel versions.
Fixes: 48a7639ce8 ("rcu: Make callers awaken grace-period kthread")
Reported-by: "He, Bo" <bo.he@intel.com>
Co-developed-by: "Zhang, Jun" <jun.zhang@intel.com>
Co-developed-by: "He, Bo" <bo.he@intel.com>
Co-developed-by: "xiao, jin" <jin.xiao@intel.com>
Co-developed-by: Bai, Jie A <jie.a.bai@intel.com>
Signed-off: "Zhang, Jun" <jun.zhang@intel.com>
Signed-off: "He, Bo" <bo.he@intel.com>
Signed-off: "xiao, jin" <jin.xiao@intel.com>
Signed-off: Bai, Jie A <jie.a.bai@intel.com>
Signed-off-by: "Zhang, Jun" <jun.zhang@intel.com>
[ paulmck: Switch from !in_softirq() to "!in_interrupt() &&
!in_serving_softirq() to avoid redundant wakeups and to also handle the
interrupt-handler scenario as well as the softirq-handler scenario that
actually occurred in testing. ]
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Link: https://lkml.kernel.org/r/CD6925E8781EFD4D8E11882D20FC406D52A11F61@SHSMSX104.ccr.corp.intel.com
Life is hard if RCU manages to get stuck without triggering RCU CPU
stall warnings or triggering the rcu_check_gp_start_stall() checks
for failing to start a grace period. This commit therefore adds a
boot-time-selectable sysrq key (commandeering "y") that allows manually
dumping Tree RCU state. The new rcutree.sysrq_rcu kernel boot parameter
must be set for this sysrq to be available.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
The rcu_check_gp_kthread_starvation() function can be invoked without
holding locks, so the access to the rcu_state structure's ->gp_flags
field must be protected with READ_ONCE(). This commit therefore adds
this protection.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
If a grace period fails to start (for example, because you commented
out the last two lines of rcu_accelerate_cbs_unlocked()), rcu_core()
will invoke rcu_check_gp_start_stall(), which will notice and complain.
However, this complaint is lacking crucial debugging information such
as when the last wakeup executed and what the value of ->gp_seq was at
that time. This commit therefore removes the current pr_alert() from
rcu_check_gp_start_stall(), instead invoking show_rcu_gp_kthreads(),
which has been updated to print the needed information, which is collected
by rcu_gp_kthread_wake().
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
The rcu_cpu_kthread_cpu used to provide debugfs information, but is no
longer used. This commit therefore removes it.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Given that RCU has a perfectly good per-CPU rcu_data structure, most
per-CPU quantities should be stored there.
This commit therefore moves the rcu_cpu_has_work per-CPU variable to
the rcu_data structure. This also makes this variable unconditionally
present, which should be acceptable given the memory reduction due to the
RCU flavor consolidation and also due to simplifications this will enable.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
The rcu_cpu_kthread_loops variable used to provide debugfs information,
but is no longer used. This commit therefore removes it.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Given that RCU has a perfectly good per-CPU rcu_data structure, most
per-CPU quantities should be stored there.
This commit therefore moves the rcu_cpu_kthread_status per-CPU variable
to the rcu_data structure. This also makes this variable unconditionally
present, which should be acceptable given the memory reduction due to the
RCU flavor consolidation and also due to simplifications this will enable.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Given that RCU has a perfectly good per-CPU rcu_data structure, most
per-CPU quantities should be stored there.
This commit therefore moves the rcu_cpu_kthread_task per-CPU variable to
the rcu_data structure. This also makes this variable unconditionally
present, which should be acceptable given the memory reduction due to the
RCU flavor consolidation and also due to simplifications this will enable.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
It is perfectly fine to set the rcutree.jiffies_till_first_fqs boot
parameter to zero, in fact, this can be useful on specialty systems that
usually have at least one idle CPU and that need fast grace periods.
This is because this setting causes the RCU grace-period kthread to
scan for idle threads immediately after grace-period initialization,
as opposed to waiting several jiffies to do so.
It is also perfectly fine to set the rcutree.rcu_kick_kthreads kernel
parameter, which gives the RCU grace-period kthread an extra wakeup
if it doesn't make progress for a period of three times the setting of
the rcutree.jiffies_till_first_fqs boot parameter. This is of course
problematic when the value of this parameter is zero, as it can result
in unnecessary wakeup IPIs along with unnecessary WARN_ONCE() invocations.
This commit therefore defers kthread kicking for at least two jiffies,
regardless of the setting of rcutree.jiffies_till_first_fqs.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
The https://github.com/paulmckrcu/litmus repository contains a large
number of C-language litmus tests that include "Result:" comments
predicting the verification result. This commit adds a number of scripts
that run tests on these litmus tests:
checkghlitmus.sh:
Runs all litmus tests in the https://github.com/paulmckrcu/litmus
archive that are C-language and that have "Result:" comment lines
documenting expected results, comparing the actual results to
those expected. Clones the repository if it has not already
been cloned into the "tools/memory-model/litmus" directory.
initlitmushist.sh
Run all litmus tests having no more than the specified number
of processes given a specified timeout, recording the results in
.litmus.out files. Clones the repository if it has not already
been cloned into the "tools/memory-model/litmus" directory.
newlitmushist.sh
For all new or updated litmus tests having no more than the
specified number of processes given a specified timeout, run
and record the results in .litmus.out files.
checklitmushist.sh
Run all litmus tests having .litmus.out files from previous
initlitmushist.sh or newlitmushist.sh runs, comparing the
herd output to that of the original runs.
The above scripts will run litmus tests concurrently, by default with
one job per available CPU. Giving any of these scripts the --help
argument will cause them to print usage information.
This commit also adds a number of helper scripts that are not intended
to be invoked from the command line:
cmplitmushist.sh: Compare the output of two different runs of the same
litmus test.
judgelitmus.sh: Compare the output of a litmus test to its "Result:"
comment line.
parseargs.sh: Parse command-line arguments.
runlitmushist.sh: Run the litmus tests whose pathnames are provided one
per line on standard input.
While in the area, this commit also makes the existing checklitmus.sh
and checkalllitmus.sh scripts use parseargs.sh in order to provide a
bit of uniformity. In addition, per-litmus-test status output is directed
to stdout, while end-of-test summary information is directed to stderr.
Finally, the error flag standardizes on "!!!" to assist those familiar
with rcutorture output.
The defaults for the parseargs.sh arguments may be overridden by using
environment variables: LKMM_DESTDIR for --destdir, LKMM_HERD_OPTIONS
for --herdoptions, LKMM_JOBS for --jobs, LKMM_PROCS for --procs, and
LKMM_TIMEOUT for --timeout.
[ paulmck: History-check summary-line changes per Alan Stern feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: akiyks@gmail.com
Cc: boqun.feng@gmail.com
Cc: dhowells@redhat.com
Cc: j.alglave@ucl.ac.uk
Cc: linux-arch@vger.kernel.org
Cc: luc.maranget@inria.fr
Cc: npiggin@gmail.com
Cc: parri.andrea@gmail.com
Cc: stern@rowland.harvard.edu
Cc: will.deacon@arm.com
Link: http://lkml.kernel.org/r/20181203230451.28921-2-paulmck@linux.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
The kernel documents smp_mb__after_unlock_lock() the following way:
"Place this after a lock-acquisition primitive to guarantee that
an UNLOCK+LOCK pair acts as a full barrier. This guarantee applies
if the UNLOCK and LOCK are executed by the same CPU or if the
UNLOCK and LOCK operate on the same lock variable."
Formalize in LKMM the above guarantee by defining (new) mb-links according
to the law:
([M] ; po ; [UL] ; (co | po) ; [LKW] ;
fencerel(After-unlock-lock) ; [M])
where the component ([UL] ; co ; [LKW]) identifies "UNLOCK+LOCK pairs on
the same lock variable" and the component ([UL] ; po ; [LKW]) identifies
"UNLOCK+LOCK pairs executed by the same CPU".
In particular, the LKMM forbids the following two behaviors (the second
litmus test below is based on:
Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.html
c.f., Section "Tree RCU Grace Period Memory Ordering Building Blocks"):
C after-unlock-lock-same-cpu
(*
* Result: Never
*)
{}
P0(spinlock_t *s, spinlock_t *t, int *x, int *y)
{
int r0;
spin_lock(s);
WRITE_ONCE(*x, 1);
spin_unlock(s);
spin_lock(t);
smp_mb__after_unlock_lock();
r0 = READ_ONCE(*y);
spin_unlock(t);
}
P1(int *x, int *y)
{
int r0;
WRITE_ONCE(*y, 1);
smp_mb();
r0 = READ_ONCE(*x);
}
exists (0:r0=0 /\ 1:r0=0)
C after-unlock-lock-same-lock-variable
(*
* Result: Never
*)
{}
P0(spinlock_t *s, int *x, int *y)
{
int r0;
spin_lock(s);
WRITE_ONCE(*x, 1);
r0 = READ_ONCE(*y);
spin_unlock(s);
}
P1(spinlock_t *s, int *y, int *z)
{
int r0;
spin_lock(s);
smp_mb__after_unlock_lock();
WRITE_ONCE(*y, 1);
r0 = READ_ONCE(*z);
spin_unlock(s);
}
P2(int *z, int *x)
{
int r0;
WRITE_ONCE(*z, 1);
smp_mb();
r0 = READ_ONCE(*x);
}
exists (0:r0=0 /\ 1:r0=0 /\ 2:r0=0)
Signed-off-by: Andrea Parri <andrea.parri@amarulasolutions.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Akira Yokosawa <akiyks@gmail.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Daniel Lustig <dlustig@nvidia.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Jade Alglave <j.alglave@ucl.ac.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luc Maranget <luc.maranget@inria.fr>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arch@vger.kernel.org
Cc: parri.andrea@gmail.com
Link: http://lkml.kernel.org/r/20181203230451.28921-1-paulmck@linux.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Not much so far, but I'm feeling like the 2nd PR -rc will be larger than
this. We have the usual batch of bugs and two fixes to code merged this cycle.
- Restore valgrind support for the ioctl verbs interface merged this window,
and fix a missed error code on an error path from that conversion
- A user reported crash on obsolete mthca hardware
- pvrdma was using the wrong command opcode toward the hypervisor
- NULL pointer crash regression when dumping rdma-cm over netlink
- Be conservative about exposing the global rkey
-----BEGIN PGP SIGNATURE-----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=ymZq
-----END PGP SIGNATURE-----
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
Pull rdma fixes frfom Jason Gunthorpe:
"Not much so far. We have the usual batch of bugs and two fixes to code
merged this cycle:
- Restore valgrind support for the ioctl verbs interface merged this
window, and fix a missed error code on an error path from that
conversion
- A user reported crash on obsolete mthca hardware
- pvrdma was using the wrong command opcode toward the hypervisor
- NULL pointer crash regression when dumping rdma-cm over netlink
- Be conservative about exposing the global rkey"
* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
RDMA/uverbs: Mark ioctl responses with UVERBS_ATTR_F_VALID_OUTPUT
RDMA/mthca: Clear QP objects during their allocation
RDMA/vmw_pvrdma: Return the correct opcode when creating WR
RDMA/cma: Add cm_id restrack resource based on kernel or user cm_id type
RDMA/nldev: Don't expose unsafe global rkey to regular user
RDMA/uverbs: Fix post send success return value in case of error
-----BEGIN PGP SIGNATURE-----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=hgg/
-----END PGP SIGNATURE-----
Merge tag 'drm-fixes-2019-01-18' of git://anongit.freedesktop.org/drm/drm
Pull drm fixes from Dave Airlie:
"The rc3 fixes are a bit scattered:
- meson, sun4i and rockchip all had missing of_node_put.
- qxl and virtio both were advertising dma-buf to userspace when they
really shouldn't have.
Otherwise:
meson:
- modesetting regression fix
i915 GVT:
- one cmd parser failure fix
- region cleanup fix in vGPU destroy
amdgpu:
- KFD fixes for arm64 mixed APU/DGPU
- vega12 powerplay fix
- raven DC fixes
- freesync fix"
* tag 'drm-fixes-2019-01-18' of git://anongit.freedesktop.org/drm/drm:
drm/amd/display: Detach backlight from stream
drm/sun4i: backend: add missing of_node_puts
Revert "drm/amdgpu: validate user pitch alignment"
Revert "drm/amdgpu: validate user GEM object size"
drm/meson: Fix atomic mode switching regression
drm/i915/gvt: Fix mmap range check
drm/i915/gvt: free VFIO region space in vgpu detach
drm/amd/display: Fix disabled cursor on top screen edge
drm/amd/display: fix warning on raven hotplug
drm/amd/display: fix PME notification not working in RV desktop
drm/amd/display: Only get the connector state for VRR when toggled
drm/amd/display: Pack DMCU iRAM alignment
drm/amd/powerplay: run acg btc for Vega12
drm/amdkfd: Don't assign dGPUs to APU topology devices
drm/amdkfd: Allow building KFD on ARM64 (v2)
drm/meson: add missing of_node_put
drm/virtio: drop prime import/export callbacks
drm/qxl: drop prime import/export callbacks
drm/i915/gvt: Allow F_CMD_ACCESS on mmio 0x21f0
drm/rockchip: add missing of_node_put
-----BEGIN PGP SIGNATURE-----
iHUEABYIAB0WIQQUwxxKyE5l/npt8ARiEGxRG/Sl2wUCXED1agAKCRBiEGxRG/Sl
2125AP4+hSXiVYvxgQg4zeAHzd00GKAIcYTudrzZ/iX5E19UlQD7B3h7HiTgvNIo
QOvU+0PChsk/qwg1+Ztw8Gw3WZxl/wM=
=I9ym
-----END PGP SIGNATURE-----
Merge tag 'led-fix-for-5.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds
Pull LED fix from Jacek Anaszewski.
* tag 'led-fix-for-5.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds:
leds: lp5523: fix a missing check of return value of lp55xx_read
Minor fixes/regressions.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1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=kzWH
-----END PGP SIGNATURE-----
Merge tag 'hwmon-for-v5.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
Pull hwmon fixes from Guenter Roeck:
"Minor fixes/regressions"
* tag 'hwmon-for-v5.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
hwmon: (tmp421) Correct the misspelling of the tmp442 compatible attribute in OF device ID table
hwmon: (occ) Fix potential integer overflow
hwmon: (lm80) Fix missing unlock on error in set_fan_div()
hwmon: (nct6775) Enable IO mapping for NCT6797D and NCT6798D
hwmon: (nct6775) Fix chip ID for NCT6798D
- Add missing calls to of_node_put to sun4i, meson, and rockchip.
- Drop unimplemented prime callbacks in virtio and qxl, so support
for prime is not advertised on those drivers.
- Fix mode switching regression in meson.
-----BEGIN PGP SIGNATURE-----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=r2rK
-----END PGP SIGNATURE-----
Merge tag 'drm-misc-fixes-2019-01-17' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes
drm-misc-fixes for v5.0-rc3:
- Add missing calls to of_node_put to sun4i, meson, and rockchip.
- Drop unimplemented prime callbacks in virtio and qxl, so support
for prime is not advertised on those drivers.
- Fix mode switching regression in meson.
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/9af07312-f435-2fda-65a2-9fe92cdf5da4@linux.intel.com
-----BEGIN PGP SIGNATURE-----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=cHcP
-----END PGP SIGNATURE-----
Merge tag 'drm-intel-fixes-2019-01-17' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes
drm/i915/gvt fixes for v5.0-rc3
"This contains one cmd parser failure fix to allow cmd access for one
register, and fix region cleanup properly in vGPU destroy, and another
fix for critical mmap size check mistake."
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/87ef9bfusc.fsf@intel.com
When lp55xx_read() fails, "status" is an uninitialized variable and thus
may contain random value; using it leads to undefined behaviors.
The fix inserts a check for the return value of lp55xx_read: if it
fails, returns with its error code.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Correct a typo in OF device ID table
The last one should be 'ti,tmp442'
Signed-off-by: Cheng-Min Ao <tony_ao@wiwynn.com>
Signed-off-by: Yu-Hsiang Chen <matt_chen@wiwynn.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
-----BEGIN PGP SIGNATURE-----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=cUrU
-----END PGP SIGNATURE-----
Merge tag 'afs-fixes-20190117' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
Pull AFS fixes from David Howells:
"Here's a set of fixes for AFS:
- Use struct_size() for kzalloc() size calculation.
- When calling YFS.CreateFile rather than AFS.CreateFile, it is
possible to create a file with a file lock already held. The
default value indicating no lock required is actually -1, not 0.
- Fix an oops in inode/vnode validation if the target inode doesn't
have a server interest assigned (ie. a server that will notify us
of changes by third parties).
- Fix refcounting of keys in file locking.
- Fix a race in refcounting asynchronous operations in the event of
an error during request transmission. The provision of a dedicated
function to get an extra ref on a call is split into a separate
commit"
* tag 'afs-fixes-20190117' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
afs: Fix race in async call refcounting
afs: Provide a function to get a ref on a call
afs: Fix key refcounting in file locking code
afs: Don't set vnode->cb_s_break in afs_validate()
afs: Set correct lock type for the yfs CreateFile
afs: Use struct_size() in kzalloc()
Pull swiotlb fix from Konrad Rzeszutek Wilk:
"A tiny fix for v5.0-rc2:
This fixes an issue with GPU cards not working anymore with the DMA
mapping work Christopher did - as the SWIOTLB is initialized first and
then free'd (as IOMMU is available) but we forgot to clear our start
and end entries which are used and BOOM"
* 'stable/for-linus-5.0' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb:
swiotlb: clear io_tlb_start and io_tlb_end in swiotlb_exit
There's a race between afs_make_call() and afs_wake_up_async_call() in the
case that an error is returned from rxrpc_kernel_send_data() after it has
queued the final packet.
afs_make_call() will try and clean up the mess, but the call state may have
been moved on thereby causing afs_process_async_call() to also try and to
delete the call.
Fix this by:
(1) Getting an extra ref for an asynchronous call for the call itself to
hold. This makes sure the call doesn't evaporate on us accidentally
and will allow the call to be retained by the caller in a future
patch. The ref is released on leaving afs_make_call() or
afs_wait_for_call_to_complete().
(2) In the event of an error from rxrpc_kernel_send_data():
(a) Don't set the call state to AFS_CALL_COMPLETE until *after* the
call has been aborted and ended. This prevents
afs_deliver_to_call() from doing anything with any notifications
it gets.
(b) Explicitly end the call immediately to prevent further callbacks.
(c) Cancel any queued async_work and wait for the work if it's
executing. This allows us to be sure the race won't recur when we
change the state. We put the work queue's ref on the call if we
managed to cancel it.
(d) Put the call's ref that we got in (1). This belongs to us as long
as the call is in state AFS_CALL_CL_REQUESTING.
Fixes: 341f741f04 ("afs: Refcount the afs_call struct")
Signed-off-by: David Howells <dhowells@redhat.com>
Fix the refcounting of the authentication keys in the file locking code.
The vnode->lock_key member points to a key on which it expects to be
holding a ref, but it isn't always given an extra ref, however.
Fixes: 0fafdc9f88 ("afs: Fix file locking")
Signed-off-by: David Howells <dhowells@redhat.com>
A cb_interest record is not necessarily attached to the vnode on entry to
afs_validate(), which can cause an oops when we try to bring the vnode's
cb_s_break up to date in the default case (ie. no current callback promise
and the vnode has not been deleted).
Fix this by simply removing the line, as vnode->cb_s_break will be set when
needed by afs_register_server_cb_interest() when we next get a callback
promise from RPC call.
The oops looks something like:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
...
RIP: 0010:afs_validate+0x66/0x250 [kafs]
...
Call Trace:
afs_d_revalidate+0x8d/0x340 [kafs]
? __d_lookup+0x61/0x150
lookup_dcache+0x44/0x70
? lookup_dcache+0x44/0x70
__lookup_hash+0x24/0xa0
do_unlinkat+0x11d/0x2c0
__x64_sys_unlink+0x23/0x30
do_syscall_64+0x4d/0xf0
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Fixes: ae3b7361dc ("afs: Fix validation/callback interaction")
Signed-off-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Commit c3ff2a5193 ("powerpc/32: add stack protector support")
caused kernel panic on PowerPC when an external module is used with
CONFIG_STACKPROTECTOR because the 'prepare' target was not executed
for the external module build.
Commit e07db28eea ("kbuild: fix single target build for external
module") turned it into a build error because the 'prepare' target is
now executed but the 'prepare0' target is missing for the external
module build.
External module on arm/arm64 with CONFIG_STACKPROTECTOR_PER_TASK is
also broken in the same way.
Move 'PHONY += prepare0' to the common place. GNU Make is fine with
missing rule for phony targets. I also removed the comment which is
wrong irrespective of this commit.
I minimize the change so it can be easily backported to 4.20.x
To fix v4.20, please backport e07db28eea ("kbuild: fix single target
build for external module"), and then this commit.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=201891
Fixes: e07db28eea ("kbuild: fix single target build for external module")
Fixes: c3ff2a5193 ("powerpc/32: add stack protector support")
Fixes: 189af46571 ("ARM: smp: add support for per-task stack canaries")
Fixes: 0a1213fa74 ("arm64: enable per-task stack canaries")
Cc: linux-stable <stable@vger.kernel.org> # v4.20
Reported-by: Samuel Holland <samuel@sholland.org>
Reported-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
- LDFLAGS_vmlinux is cleared by the top Makefile
- 'all: vmlinux' is specified by the top Makefile
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
- scripts/Kbuild.include already defined 'comma'
- The top Makefile has 'PHONY += FORCE'
- include/asm-*/ was moved to arch/*/include/asm/ a decade ago
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Pull security subsystem fixes from James Morris:
"Fixes for the security subsystem.
The first (by Casey actually - it's misattributed) fixes a regression
introduced with the LSM stacking changes"
* 'fixes-v5.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
LSM: Check for NULL cred-security on free
Yama: Check for pid death before checking ancestry
seccomp: fix UAF in user-trap code
From: Casey Schaufler <casey@schaufler-ca.com>
Check that the cred security blob has been set before trying
to clean it up. There is a case during credential initialization
that could result in this.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Acked-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <james.morris@microsoft.com>
Reported-by: syzbot+69ca07954461f189e808@syzkaller.appspotmail.com
[Why]
Backlight is conceptually a property of links, not streams.
All backlight programming is done on links, but there is a
stream property bl_pwm_level that is used to restore backlight
on dpms on and s3 resume. This is unnecessary, as backlight
is already restored by hardware with no driver intervention.
[How]
Remove bl_pwm_level, and the stream argument to set_backlight
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=109375
Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 923fe49512)
It's possible that a pid has died before we take the rcu lock, in which
case we can't walk the ancestry list as it may be detached. Instead, check
for death first before doing the walk.
Reported-by: syzbot+a9ac39bf55329e206219@syzkaller.appspotmail.com
Fixes: 2d514487fa ("security: Yama LSM")
Cc: stable@vger.kernel.org
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.morris@microsoft.com>
As reported, the SPDX license id is not placed correctly and the variant
of the BSD License used should be specified.
Fixes: c16292578f ("dt-bindings: reset: Add bindings for the Meson-AXG SoC Reset Controller")
Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Rob Herring <robh@kernel.org>
The cp110-system-controller0.txt file was renamed to
cp110-system-controller.txt.
Fixes: 4aa5496980 ("dt-bindings: cp110: rename cp110 syscon file")
Signed-off-by: Otto Sabart <ottosabart@seberm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Add an of_node_put when the result of of_graph_get_remote_port_parent is
not available.
The semantic match that finds this problem is as follows
(http://coccinelle.lip6.fr):
// <smpl>
@r exists@
local idexpression e;
expression x;
@@
e = of_graph_get_remote_port_parent(...);
... when != x = e
when != true e == NULL
when != of_node_put(e)
when != of_fwnode_handle(e)
(
return e;
|
*return ...;
)
// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: stable@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Otherwise is_swiotlb_buffer will return false positives when
we first initialize a swiotlb buffer, but then free it because
we have an IOMMU available.
Fixes: 55897af630 ("dma-direct: merge swiotlb_dma_ops into the dma_direct code")
Reported-by: Sibren Vasse <sibren@sibrenvasse.nl>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Sibren Vasse <sibren@sibrenvasse.nl>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
-----BEGIN PGP SIGNATURE-----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=hMwM
-----END PGP SIGNATURE-----
Merge tag 'selinux-pr-20190115' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux
Pull SELinux fix from Paul Moore:
"One small patch to fix a potential NULL dereference on a failed
SELinux policy load"
* tag 'selinux-pr-20190115' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
selinux: fix GPF on invalid policy
The device node iterators perform an of_node_get on each
iteration, so a jump out of the loop requires an of_node_put.
Remote and port also have augmented reference counts, so drop them
on each iteration and at the end of the function, respectively.
Remote is only used for the address it contains, not for the
contents of that address, so the reference count can be dropped
immediately.
The semantic patch that fixes the first part of this problem is
as follows (http://coccinelle.lip6.fr):
// <smpl>
@@
expression root,e;
local idexpression child;
iterator name for_each_child_of_node;
@@
for_each_available_child_of_node(root, child) {
... when != of_node_put(child)
when != e = child
+ of_node_put(child);
? break;
...
}
... when != child
// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1547369264-24831-5-git-send-email-Julia.Lawall@lip6.fr
On the failure path, we do an fput() of the listener fd if the filter fails
to install (e.g. because of a TSYNC race that's lost, or if the thread is
killed, etc.). fput() doesn't actually release the fd, it just ads it to a
work queue. Then the thread proceeds to free the filter, even though the
listener struct file has a reference to it.
To fix this, on the failure path let's set the private data to null, so we
know in ->release() to ignore the filter.
Reported-by: syzbot+981c26489b2d1c6316ba@syzkaller.appspotmail.com
Fixes: 6a21cc50f0 ("seccomp: add a return code to trap to userspace")
Signed-off-by: Tycho Andersen <tycho@tycho.ws>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.morris@microsoft.com>
Zhang, Jun