Fixes: b77eb79acca3 ("mfd: da9061: Fix to remove BBAT_CONT register from chip model") Reported-by: Steve Twiss <[email protected]> Reviewed-by: Steve Twiss <[email protected]> Signed-off-by: Lee Jones <[email protected]>
Dave Airlie [Tue, 22 Aug 2017 06:53:32 +0000 (16:53 +1000)]
Merge tag 'drm-misc-fixes-2017-08-18' of git://anongit.freedesktop.org/git/drm-misc into drm-fixes
Core Changes:
- Fix framebuffer leak in setplane error condition (Nikil)
- Prevent BUG in atomic_ioctl by properly resetting state on EDEADLK (Maarten)
- Add missing return in atomic_check_only if atomic_check fails (Maarten)
Driver Changes:
- rockchip: Don't try to suspend if device not initialized (Jeffy)
Cc: Jeffy Chen <[email protected]> Cc: Nikhil Mahale <[email protected]> Cc: Maarten Lankhorst <[email protected]>
* tag 'drm-misc-fixes-2017-08-18' of git://anongit.freedesktop.org/git/drm-misc:
drm/atomic: If the atomic check fails, return its value first
drm/atomic: Handle -EDEADLK with out-fences correctly
drm: Fix framebuffer leak
drm/rockchip: Fix suspend crash when drm is not bound
Dave Airlie [Tue, 22 Aug 2017 06:52:36 +0000 (16:52 +1000)]
Merge tag 'imx-drm-fixes-2017-08-18' of git://git.pengutronix.de/git/pza/linux into drm-fixes
drm/imx: fix YUV primary plane and IPUv3 build corner case
- Enable color space conversion on the primary plane when the framebuffer
format is a YUV format.
- The IPUv3 base driver now uses drm_format_info in the PRE/PRG code. The
PRE/PRG parts are already disabled if DRM is not available. Enforce that
if DRM is built as a module, IPUv3 must be built as a module, too.
* tag 'imx-drm-fixes-2017-08-18' of git://git.pengutronix.de/git/pza/linux:
drm/imx: ipuv3-plane: fix YUV framebuffer scanout on the base plane
gpu: ipu-v3: add DRM dependency
Dave Airlie [Tue, 22 Aug 2017 06:50:07 +0000 (16:50 +1000)]
Merge tag 'sunxi-drm-fixes-for-4.13' of https://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux into drm-fixes
Allwinner DRM fixes for 4.13
A single commit to restore the framebuffer console when there's no DRM
users left.
* tag 'sunxi-drm-fixes-for-4.13' of https://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux:
drm/sun4i: Implement drm_driver lastclose to restore fbdev console
Thomas Petazzoni [Sun, 13 Aug 2017 21:14:58 +0000 (23:14 +0200)]
sparc: kernel/pcic: silence gcc 7.x warning in pcibios_fixup_bus()
When building the kernel for Sparc using gcc 7.x, the build fails
with:
arch/sparc/kernel/pcic.c: In function ‘pcibios_fixup_bus’:
arch/sparc/kernel/pcic.c:647:8: error: ‘cmd’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
cmd |= PCI_COMMAND_IO;
^~
I.e, the code assumes that pcic_read_config() will always initialize
cmd. But it's not the case. Looking at pcic_read_config(), if
bus->number is != 0 or if the size is not one of 1, 2 or 4, *val will
not be initialized.
As a simple fix, we initialize cmd to zero at the beginning of
pcibios_fixup_bus.
Linus Torvalds [Mon, 21 Aug 2017 20:30:36 +0000 (13:30 -0700)]
Merge tag 'arc-4.13-rc7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
Pull ARC fixes from Vineet Gupta:
- PAE40 related updates
- SLC errata for region ops
- intc line masking by default
* tag 'arc-4.13-rc7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
arc: Mask individual IRQ lines during core INTC init
ARCv2: PAE40: set MSB even if !CONFIG_ARC_HAS_PAE40 but PAE exists in SoC
ARCv2: PAE40: Explicitly set MSB counterpart of SLC region ops addresses
ARC: dma: implement dma_unmap_page and sg variant
ARCv2: SLC: Make sure busy bit is set properly for region ops
ARC: [plat-sim] Include this platform unconditionally
ARC: [plat-axs10x]: prepare dts files for enabling PAE40 on axs103
ARC: defconfig: Cleanup from old Kconfig options
2) Fix timer access to freed object in dccp, from Eric Dumazet.
3) Use kmalloc_array() in ptr_ring to avoid overflow cases which are
triggerable by userspace. Also from Eric Dumazet.
4) Fix infinite loop in unmapping cleanup of nfp driver, from Colin Ian
King.
5) Correct datagram peek handling of empty SKBs, from Matthew Dawson.
6) Fix use after free in TIPC, from Eric Dumazet.
7) When replacing a route in ipv6 we need to reset the round robin
pointer, from Wei Wang.
8) Fix bug in pci_find_pcie_root_port() which was unearthed by the
relaxed ordering changes, from Thierry Redding. I made sure to get
an explicit ACK from Bjorn this time around :-)
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (27 commits)
ipv6: repair fib6 tree in failure case
net_sched: fix order of queue length updates in qdisc_replace()
tools lib bpf: improve warning
switchdev: documentation: minor typo fixes
bpf, doc: also add s390x as arch to sysctl description
net: sched: fix NULL pointer dereference when action calls some targets
rxrpc: Fix oops when discarding a preallocated service call
irda: do not leak initialized list.dev to userspace
net/mlx4_core: Enable 4K UAR if SRIOV module parameter is not enabled
PCI: Allow PCI express root ports to find themselves
tcp: when rearming RTO, if RTO time is in past then fire RTO ASAP
net: check and errout if res->fi is NULL when RTM_F_FIB_MATCH is set
ipv6: reset fn->rr_ptr when replacing route
sctp: fully initialize the IPv6 address in sctp_v6_to_addr()
tipc: fix use-after-free
tun: handle register_netdevice() failures properly
datagram: When peeking datagrams with offset < 0 don't skip empty skbs
bpf, doc: improve sysctl knob description
netxen: fix incorrect loop counter decrement
nfp: fix infinite loop on umapping cleanup
...
Oleg Nesterov [Mon, 21 Aug 2017 15:35:02 +0000 (17:35 +0200)]
pids: make task_tgid_nr_ns() safe
This was reported many times, and this was even mentioned in commit 52ee2dfdd4f5 ("pids: refactor vnr/nr_ns helpers to make them safe") but
somehow nobody bothered to fix the obvious problem: task_tgid_nr_ns() is
not safe because task->group_leader points to nowhere after the exiting
task passes exit_notify(), rcu_read_lock() can not help.
We really need to change __unhash_process() to nullify group_leader,
parent, and real_parent, but this needs some cleanups. Until then we
can turn task_tgid_nr_ns() into another user of __task_pid_nr_ns() and
fix the problem.
sthyi should only generate a specification exception if the function
code is zero and the response buffer is not on a 4k boundary.
The current code would also test for unknown function codes if the
response buffer, that is currently only defined for function code 0,
is not on a 4k boundary and incorrectly inject a specification
exception instead of returning with condition code 3 and return code 4
(unsupported function code).
Heiko Carstens [Thu, 3 Aug 2017 11:05:11 +0000 (13:05 +0200)]
KVM: s390: sthyi: fix sthyi inline assembly
The sthyi inline assembly misses register r3 within the clobber
list. The sthyi instruction will always write a return code to
register "R2+1", which in this case would be r3. Due to that we may
have register corruption and see host crashes or data corruption
depending on how gcc decided to allocate and use registers during
compile time.
Shawn Lin [Fri, 18 Aug 2017 01:16:08 +0000 (09:16 +0800)]
mmc: block: prevent propagating R1_OUT_OF_RANGE for open-ending mode
We to some extent should tolerate R1_OUT_OF_RANGE for open-ending
mode as it is expected behaviour and most of the backup partition
tables should be located near some of the last blocks which will
always make open-ending read exceed the capacity of cards.
Fixes: 9820a5b11101 ("mmc: core: for data errors, take response of stop cmd into account") Fixes: a04e6bae9e6f ("mmc: core: check also R1 response for stop commands") Signed-off-by: Shawn Lin <[email protected]> Reviewed-by: Wolfram Sang <[email protected]> Tested-by: Shawn Guo <[email protected]> Signed-off-by: Ulf Hansson <[email protected]>
Current max_register setting breaks reading nvram on certain chips and
also reading the standard registers on RX8130 where register map starts
at 0x10.
Chris Wilson [Mon, 7 Aug 2017 12:19:19 +0000 (13:19 +0100)]
drm/i915: Clear lost context-switch interrupts across reset
During a global reset, we disable the irq. As we disable the irq, the
hardware may be raising a GT interrupt that we then ignore, leaving it
pending in the GTIIR. After the reset, we then re-enable the irq,
triggering the pending interrupt. However, that interrupt was for the
stale state from before the reset, and the contents of the CSB buffer
are now invalid.
v2: Add a comment to make it clear that the double clear is purely my
paranoia.
Andy Shevchenko [Thu, 17 Aug 2017 10:55:41 +0000 (13:55 +0300)]
drm/i915/bxt: use NULL for GPIO connection ID
The commit 213e08ad60ba
("drm/i915/bxt: add bxt dsi gpio element support")
enables GPIO support for Broxton based platforms.
While using that API we might get into troubles in the future, because
we can't rely on label name in the driver since vendor firmware might
provide any GPIO pin there, e.g. "reset", and even mark it in _DSD (in
which case the request will fail).
To avoid inconsistency and potential issues we have two options:
a) generate GPIO ACPI mapping table and supply it via
acpi_dev_add_driver_gpios(), or
b) just pass NULL as connection ID.
The b) approach is much simpler and would work since the driver relies
on GPIO indices only. Moreover, the _CRS fallback mechanism, when
requesting GPIO, has been made stricter, and supplying non-NULL
connection ID when neither _DSD, nor GPIO ACPI mapping is present, is
making request fail.
soc: ti: knav: Add a NULL pointer check for kdev in knav_pool_create
knav_pool_create is an exported function. In the event of a call
before knav_queue_probe, we encounter a NULL pointer dereference
in the following line. Hence return -EPROBE_DEFER to the caller till
the kdev pointer is non-NULL.
Wei Wang [Sat, 19 Aug 2017 00:14:49 +0000 (17:14 -0700)]
ipv6: repair fib6 tree in failure case
In fib6_add(), it is possible that fib6_add_1() picks an intermediate
node and sets the node's fn->leaf to NULL in order to add this new
route. However, if fib6_add_rt2node() fails to add the new
route for some reason, fn->leaf will be left as NULL and could
potentially cause crash when fn->leaf is accessed in fib6_locate().
This patch makes sure fib6_repair_tree() is called to properly repair
fn->leaf in the above failure case.
net_sched: fix order of queue length updates in qdisc_replace()
This important to call qdisc_tree_reduce_backlog() after changing queue
length. Parent qdisc should deactivate class in ->qlen_notify() called from
qdisc_tree_reduce_backlog() but this happens only if qdisc->q.qlen in zero.
Missed class deactivations leads to crashes/warnings at picking packets
from empty qdisc and corrupting state at reactivating this class in future.
Signed-off-by: Konstantin Khlebnikov <[email protected]> Fixes: 86a7996cc8a0 ("net_sched: introduce qdisc_replace() helper") Acked-by: Cong Wang <[email protected]> Signed-off-by: David S. Miller <[email protected]>
Daniel Borkmann [Sun, 20 Aug 2017 22:26:03 +0000 (00:26 +0200)]
bpf, doc: also add s390x as arch to sysctl description
Looks like this was accidentally missed, so still add s390x
as supported eBPF JIT arch to bpf_jit_enable.
Fixes: 014cd0a368dc ("bpf: Update sysctl documentation to list all supported architectures") Signed-off-by: Daniel Borkmann <[email protected]> Acked-by: Alexei Starovoitov <[email protected]> Signed-off-by: David S. Miller <[email protected]>
Ben Hutchings [Sat, 19 Aug 2017 21:30:02 +0000 (22:30 +0100)]
kbuild: Do not use hyphen in exported variable name
This definition in Makefile.dtbinst:
export dtbinst-root ?= $(obj)
should define and export dtbinst-root when handling the root dts
directory, and do nothing in the subdirectories. However some shells,
including dash, will not pass through environment variables whose name
includes a hyphen. Usually GNU make does not use a shell to recurse,
but if e.g. $(srctree) contains '~' it will use a shell here.
Rename the variable to dtbinst_root.
References: https://bugs.debian.org/833561 Fixes: 323a028d39cdi ("dts, kbuild: Implement support for dtb vendor subdirs") Signed-off-by: Ben Hutchings <[email protected]> Signed-off-by: Masahiro Yamada <[email protected]>
Commit 971a69db7dc0 ("Xen: don't warn about 2-byte wchar_t in efi")
added the --no-wchar-size-warning to the Makefile to avoid this
harmless warning:
arm-linux-gnueabi-ld: warning: drivers/xen/efi.o uses 2-byte wchar_t yet the output is to use 4-byte wchar_t; use of wchar_t values across objects may fail
Changing kbuild to use thin archives instead of recursive linking
unfortunately brings the same warning back during the final link.
The kernel does not use wchar_t string literals at this point, and
xen does not use wchar_t at all (only efi_char16_t), so the flag
has no effect, but as pointed out by Jan Beulich, adding a wchar_t
string literal would be bad here.
Since wchar_t is always defined as u16, independent of the toolchain
default, always passing -fshort-wchar is correct and lets us
remove the Xen specific hack along with fixing the warning.
Linus Torvalds [Sun, 20 Aug 2017 20:26:27 +0000 (13:26 -0700)]
Sanitize 'move_pages()' permission checks
The 'move_paghes()' system call was introduced long long ago with the
same permission checks as for sending a signal (except using
CAP_SYS_NICE instead of CAP_SYS_KILL for the overriding capability).
That turns out to not be a great choice - while the system call really
only moves physical page allocations around (and you need other
capabilities to do a lot of it), you can check the return value to map
out some the virtual address choices and defeat ASLR of a binary that
still shares your uid.
So change the access checks to the more common 'ptrace_may_access()'
model instead.
This tightens the access checks for the uid, and also effectively
changes the CAP_SYS_NICE check to CAP_SYS_PTRACE, but it's unlikely that
anybody really _uses_ this legacy system call any more (we hav ebetter
NUMA placement models these days), so I expect nobody to notice.
Merge tag 'fixes-for-4.13b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-linus
Jonathan writes:
Second set of IIO fixes for the 4.13 cycle.
Given the late stage of this series, some more involved fixes have been
held back for the upcoming merge window.
The hid-sensor issue has been causing problems for a long time so it
is great to have that one finally fixed! No more bug reports for the
userspace guys (well about that anyway).
* documentation
- some warning fixes due to missing colons in kernel-doc.
* adis16480
- fix accel scale factor.
* bmp280
- properly initialize the device for humidity readings - without this
the humidity readings may be skipped and a magic value of 0x8000 returned.
* hid-sensor-strigger
- fix a race with user space when powering up the sensor.
* ina291
- Avoid an underflow for the sleeping time as a result of supporting the
fastest rates.
* st-magnetometer
- Fix the status register address for hte LSM303AGR,
- Remove the ihl property for LSM303AGR as the sensor doesn't support
active low for the dataready line.
* stm32-adc
- Fix use of a common clock rate.
* stm32-timer
- fix the quadrature mode get routine to account for the magic 0 value.
set on boot.
- fix the return value of write_raw,
- fix the get/set down count direction as the enum value was not being
converted to the relevant bit field,
- add an enable attribute to actually turn it on when in encoder mode,
- missing mask when reading the trigger mode.
Linus Torvalds [Sun, 20 Aug 2017 16:36:52 +0000 (09:36 -0700)]
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Thomas Gleixner:
"Another pile of small fixes and updates for x86:
- Plug a hole in the SMAP implementation which misses to clear AC on
NMI entry
- Fix the norandmaps/ADDR_NO_RANDOMIZE logic so the command line
parameter works correctly again
- Use the proper accessor in the startup64 code for next_early_pgt to
prevent accessing of invalid addresses and faulting in the early
boot code.
- Prevent CPU hotplug lock recursion in the MTRR code
- Unbreak CPU0 hotplugging
- Rename overly long CPUID bits which got introduced in this cycle
- Two commits which mark data 'const' and restrict the scope of data
and functions to file scope by making them 'static'"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86: Constify attribute_group structures
x86/boot/64/clang: Use fixup_pointer() to access 'next_early_pgt'
x86/elf: Remove the unnecessary ADDR_NO_RANDOMIZE checks
x86: Fix norandmaps/ADDR_NO_RANDOMIZE
x86/mtrr: Prevent CPU hotplug lock recursion
x86: Mark various structures and functions as 'static'
x86/cpufeature, kvm/svm: Rename (shorten) the new "virtualized VMSAVE/VMLOAD" CPUID flag
x86/smpboot: Unbreak CPU0 hotplug
x86/asm/64: Clear AC on NMI entries
Linus Torvalds [Sun, 20 Aug 2017 16:20:57 +0000 (09:20 -0700)]
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Thomas Gleixner:
"Two fixes for the perf subsystem:
- Fix an inconsistency of RDPMC mm struct tagging across exec() which
causes RDPMC to fault.
- Correct the timestamp mechanics across IOC_DISABLE/ENABLE which
causes incorrect timestamps and total time calculations"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/core: Fix time on IOC_ENABLE
perf/x86: Fix RDPMC vs. mm_struct tracking
Linus Torvalds [Sun, 20 Aug 2017 16:07:56 +0000 (09:07 -0700)]
Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq fixes from Thomas Gleixner:
"A pile of smallish changes all over the place:
- Add a missing ISB in the GIC V1 driver
- Remove an ACPI version check in the GIC V3 ITS driver
- Add the missing irq_pm_shutdown function for BRCMSTB-L2 to avoid
spurious wakeups
- Remove the artifical limitation of ITS instances to the number of
NUMA nodes which prevents utilizing the ITS hardware correctly
- Prevent a infinite parsing loop in the GIC-V3 ITS/MSI code
- Honour the force affinity argument in the GIC-V3 driver which is
required to make perf work correctly
- Correctly report allocation failures in GIC-V2/V3 to avoid using
half allocated and initialized interrupts.
- Fixup checks against nr_cpu_ids in the generic IPI code"
* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
genirq/ipi: Fixup checks against nr_cpu_ids
genirq: Restore trigger settings in irq_modify_status()
MAINTAINERS: Remove Jason Cooper's irqchip git tree
irqchip/gic-v3-its-platform-msi: Fix msi-parent parsing loop
irqchip/gic-v3-its: Allow GIC ITS number more than MAX_NUMNODES
irqchip: brcmstb-l2: Define an irq_pm_shutdown function
irqchip/gic: Ensure we have an ISB between ack and ->handle_irq
irqchip/gic-v3-its: Remove ACPICA version check for ACPI NUMA
irqchip/gic-v3: Honor forced affinity setting
irqchip/gic-v3: Report failures in gic_irq_domain_alloc
irqchip/gic-v2: Report failures in gic_irq_domain_alloc
irqchip/atmel-aic: Remove root argument from ->fixup() prototype
irqchip/atmel-aic: Fix unbalanced refcount in aic_common_rtc_irq_fixup()
irqchip/atmel-aic: Fix unbalanced of_node_put() in aic_common_irq_fixup()
Linus Torvalds [Sun, 20 Aug 2017 15:54:30 +0000 (08:54 -0700)]
Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull watchdog fix from Thomas Gleixner:
"A fix for the hardlockup watchdog to prevent false positives with
extreme Turbo-Modes which make the perf/NMI watchdog fire faster than
the hrtimer which is used to verify.
Slightly larger than the minimal fix, which just would increase the
hrtimer frequency, but comes with extra overhead of more watchdog
timer interrupts and thread wakeups for all users.
With this change we restrict the overhead to the extreme Turbo-Mode
systems"
* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
kernel/watchdog: Prevent false positives with turbo modes
iio: hid-sensor-trigger: Fix the race with user space powering up sensors
It has been reported for a while that with iio-sensor-proxy service the
rotation only works after one suspend/resume cycle. This required a wait
in the systemd unit file to avoid race. I found a Yoga 900 where I could
reproduce this.
The problem scenerio is:
- During sensor driver init, enable run time PM and also set a
auto-suspend for 3 seconds.
This result in one runtime resume. But there is a check to avoid
a powerup in this sequence, but rpm is active
- User space iio-sensor-proxy tries to power up the sensor. Since rpm is
active it will simply return. But sensors were not actually
powered up in the prior sequence, so actaully the sensors will not work
- After 3 seconds the auto suspend kicks
If we add a wait in systemd service file to fire iio-sensor-proxy after
3 seconds, then now everything will work as the runtime resume will
actually powerup the sensor as this is a user request.
To avoid this:
- Remove the check to match user requested state, this will cause a
brief powerup, but if the iio-sensor-proxy starts immediately it will
still work as the sensors are ON.
- Also move the autosuspend delay to place when user requested turn off
of sensors, like after user finished raw read or buffer disable
Jonathan Corbet [Sun, 30 Jul 2017 22:14:42 +0000 (16:14 -0600)]
PATCH] iio: Fix some documentation warnings
The kerneldoc description for the trig_readonly field of struct iio_dev
lacked a colon, leading to this doc build warning:
./include/linux/iio/iio.h:603: warning: No description found for parameter 'trig_readonly'
A similar issue for iio_trigger_set_immutable() in trigger.h yielded:
./include/linux/iio/trigger.h:151: warning: No description found for parameter 'indio_dev'
./include/linux/iio/trigger.h:151: warning: No description found for parameter 'trig'
Takashi Sakamoto [Sun, 20 Aug 2017 06:54:26 +0000 (15:54 +0900)]
ALSA: firewire: fix NULL pointer dereference when releasing uninitialized data of iso-resource
When calling 'iso_resource_free()' for uninitialized data, this function
causes NULL pointer dereference due to its 'unit' member. This occurs when
unplugging audio and music units on IEEE 1394 bus at failure of card
registration.
This commit fixes the bug. The bug exists since kernel v4.5.
Fixes: 324540c4e05c ('ALSA: fireface: postpone sound card registration') at v4.12 Fixes: 8865a31e0fd8 ('ALSA: firewire-motu: postpone sound card registration') at v4.12 Fixes: b610386c8afb ('ALSA: firewire-tascam: deleyed registration of sound card') at v4.7 Fixes: 86c8dd7f4da3 ('ALSA: firewire-digi00x: delayed registration of sound card') at v4.7 Fixes: 6c29230e2a5f ('ALSA: oxfw: delayed registration of sound card') at v4.7 Fixes: 7d3c1d5901aa ('ALSA: fireworks: delayed registration of sound card') at v4.7 Fixes: 04a2c73c97eb ('ALSA: bebob: delayed registration of sound card') at v4.7 Fixes: b59fb1900b4f ('ALSA: dice: postpone card registration') at v4.5 Cc: <[email protected]> # v4.5+ Signed-off-by: Takashi Sakamoto <[email protected]> Signed-off-by: Takashi Iwai <[email protected]>
Xin Long [Fri, 18 Aug 2017 03:01:36 +0000 (11:01 +0800)]
net: sched: fix NULL pointer dereference when action calls some targets
As we know in some target's checkentry it may dereference par.entryinfo
to check entry stuff inside. But when sched action calls xt_check_target,
par.entryinfo is set with NULL. It would cause kernel panic when calling
some targets.
It can be reproduce with:
# tc qd add dev eth1 ingress handle ffff:
# tc filter add dev eth1 parent ffff: u32 match u32 0 0 action xt \
-j ECN --ecn-tcp-remove
It could also crash kernel when using target CLUSTERIP or TPROXY.
By now there's no proper value for par.entryinfo in ipt_init_target,
but it can not be set with NULL. This patch is to void all these
panics by setting it with an ipt_entry obj with all members = 0.
Note that this issue has been there since the very beginning.
David Howells [Thu, 17 Aug 2017 23:19:42 +0000 (00:19 +0100)]
rxrpc: Fix oops when discarding a preallocated service call
rxrpc_service_prealloc_one() doesn't set the socket pointer on any new call
it preallocates, but does add it to the rxrpc net namespace call list.
This, however, causes rxrpc_put_call() to oops when the call is discarded
when the socket is closed. rxrpc_put_call() needs the socket to be able to
reach the namespace so that it can use a lock held therein.
Fix this by setting a call's socket pointer immediately before discarding
it.
This can be triggered by unloading the kafs module, resulting in an oops
like the following:
Fixes: 2baec2c3f854 ("rxrpc: Support network namespacing") Signed-off-by: David Howells <[email protected]> Signed-off-by: David S. Miller <[email protected]>
Colin Ian King [Thu, 17 Aug 2017 22:14:58 +0000 (23:14 +0100)]
irda: do not leak initialized list.dev to userspace
list.dev has not been initialized and so the copy_to_user is copying
data from the stack back to user space which is a potential
information leak. Fix this ensuring all of list is initialized to
zero.
Detected by CoverityScan, CID#1357894 ("Uninitialized scalar variable")
Huy Nguyen [Thu, 17 Aug 2017 15:29:52 +0000 (18:29 +0300)]
net/mlx4_core: Enable 4K UAR if SRIOV module parameter is not enabled
enable_4k_uar module parameter was added in patch cited below to
address the backward compatibility issue in SRIOV when the VM has
system's PAGE_SIZE uar implementation and the Hypervisor has 4k uar
implementation.
The above compatibility issue does not exist in the non SRIOV case.
In this patch, we always enable 4k uar implementation if SRIOV
is not enabled on mlx4's supported cards.
Thierry Reding [Thu, 17 Aug 2017 11:06:14 +0000 (13:06 +0200)]
PCI: Allow PCI express root ports to find themselves
If the pci_find_pcie_root_port() function is called on a root port
itself, return the root port rather than NULL.
This effectively reverts commit 0e405232871d6 ("PCI: fix oops when
try to find Root Port for a PCI device") which added an extra check
that would now be redundant.
Fixes: a99b646afa8a ("PCI: Disable PCIe Relaxed Ordering if unsupported") Fixes: c56d4450eb68 ("PCI: Turn off Request Attributes to avoid Chelsio T5 Completion erratum") Signed-off-by: Thierry Reding <[email protected]> Acked-by: Bjorn Helgaas <[email protected]> Tested-by: Shawn Lin <[email protected]> Tested-by: Michael Ellerman <[email protected]> Signed-off-by: David S. Miller <[email protected]>
Neal Cardwell [Wed, 16 Aug 2017 21:53:36 +0000 (17:53 -0400)]
tcp: when rearming RTO, if RTO time is in past then fire RTO ASAP
In some situations tcp_send_loss_probe() can realize that it's unable
to send a loss probe (TLP), and falls back to calling tcp_rearm_rto()
to schedule an RTO timer. In such cases, sometimes tcp_rearm_rto()
realizes that the RTO was eligible to fire immediately or at some
point in the past (delta_us <= 0). Previously in such cases
tcp_rearm_rto() was scheduling such "overdue" RTOs to happen at now +
icsk_rto, which caused needless delays of hundreds of milliseconds
(and non-linear behavior that made reproducible testing
difficult). This commit changes the logic to schedule "overdue" RTOs
ASAP, rather than at now + icsk_rto.
Linus Torvalds [Fri, 18 Aug 2017 23:06:33 +0000 (16:06 -0700)]
Merge branch 'akpm' (patches from Andrew)
Merge misc fixes from Andrew Morton:
"14 fixes"
* emailed patches from Andrew Morton <[email protected]>:
mm: revert x86_64 and arm64 ELF_ET_DYN_BASE base changes
mm/vmalloc.c: don't unconditonally use __GFP_HIGHMEM
mm/mempolicy: fix use after free when calling get_mempolicy
mm/cma_debug.c: fix stack corruption due to sprintf usage
signal: don't remove SIGNAL_UNKILLABLE for traced tasks.
mm, oom: fix potential data corruption when oom_reaper races with writer
mm: fix double mmap_sem unlock on MMF_UNSTABLE enforced SIGBUS
slub: fix per memcg cache leak on css offline
mm: discard memblock data later
test_kmod: fix description for -s -and -c parameters
kmod: fix wait on recursive loop
wait: add wait_event_killable_timeout()
kernel/watchdog: fix Kconfig constraints for perf hardlockup watchdog
mm: memcontrol: fix NULL pointer crash in test_clear_page_writeback()
Wei Wang [Wed, 16 Aug 2017 18:18:09 +0000 (11:18 -0700)]
ipv6: reset fn->rr_ptr when replacing route
syzcaller reported the following use-after-free issue in rt6_select():
BUG: KASAN: use-after-free in rt6_select net/ipv6/route.c:755 [inline] at addr ffff8800bc6994e8
BUG: KASAN: use-after-free in ip6_pol_route.isra.46+0x1429/0x1470 net/ipv6/route.c:1084 at addr ffff8800bc6994e8
Read of size 4 by task syz-executor1/439628
CPU: 0 PID: 439628 Comm: syz-executor1 Not tainted 4.3.5+ #8
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000ffff88018fe435b0ffffffff81ca384dffff8801d3588c00 ffff8800bc699380ffff8800bc699500dffffc0000000000ffff8801d40a47c0 ffff88018fe435d8ffffffff81735751ffff88018fe43660ffff8800bc699380
Call Trace:
[<ffffffff81ca384d>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81ca384d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
sctp: [Deprecated]: syz-executor0 (pid 439615) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
[<ffffffff81735751>] kasan_object_err+0x21/0x70 mm/kasan/report.c:158
[<ffffffff817359c4>] print_address_description mm/kasan/report.c:196 [inline]
[<ffffffff817359c4>] kasan_report_error+0x1b4/0x4a0 mm/kasan/report.c:285
[<ffffffff81735d93>] kasan_report mm/kasan/report.c:305 [inline]
[<ffffffff81735d93>] __asan_report_load4_noabort+0x43/0x50 mm/kasan/report.c:325
[<ffffffff82a28e39>] rt6_select net/ipv6/route.c:755 [inline]
[<ffffffff82a28e39>] ip6_pol_route.isra.46+0x1429/0x1470 net/ipv6/route.c:1084
[<ffffffff82a28fb1>] ip6_pol_route_output+0x81/0xb0 net/ipv6/route.c:1203
[<ffffffff82ab0a50>] fib6_rule_action+0x1f0/0x680 net/ipv6/fib6_rules.c:95
[<ffffffff8265cbb6>] fib_rules_lookup+0x2a6/0x7a0 net/core/fib_rules.c:223
[<ffffffff82ab1430>] fib6_rule_lookup+0xd0/0x250 net/ipv6/fib6_rules.c:41
[<ffffffff82a22006>] ip6_route_output+0x1d6/0x2c0 net/ipv6/route.c:1224
[<ffffffff829e83d2>] ip6_dst_lookup_tail+0x4d2/0x890 net/ipv6/ip6_output.c:943
[<ffffffff829e889a>] ip6_dst_lookup_flow+0x9a/0x250 net/ipv6/ip6_output.c:1079
[<ffffffff82a9f7d8>] ip6_datagram_dst_update+0x538/0xd40 net/ipv6/datagram.c:91
[<ffffffff82aa0978>] __ip6_datagram_connect net/ipv6/datagram.c:251 [inline]
[<ffffffff82aa0978>] ip6_datagram_connect+0x518/0xe50 net/ipv6/datagram.c:272
[<ffffffff82aa1313>] ip6_datagram_connect_v6_only+0x63/0x90 net/ipv6/datagram.c:284
[<ffffffff8292f790>] inet_dgram_connect+0x170/0x1f0 net/ipv4/af_inet.c:564
[<ffffffff82565547>] SYSC_connect+0x1a7/0x2f0 net/socket.c:1582
[<ffffffff8256a649>] SyS_connect+0x29/0x30 net/socket.c:1563
[<ffffffff82c72032>] entry_SYSCALL_64_fastpath+0x12/0x17
Object at ffff8800bc699380, in cache ip6_dst_cache size: 384
The root cause of it is that in fib6_add_rt2node(), when it replaces an
existing route with the new one, it does not update fn->rr_ptr.
This commit resets fn->rr_ptr to NULL when it points to a route which is
replaced in fib6_add_rt2node().
sctp: fully initialize the IPv6 address in sctp_v6_to_addr()
KMSAN reported use of uninitialized sctp_addr->v4.sin_addr.s_addr and
sctp_addr->v6.sin6_scope_id in sctp_v6_cmp_addr() (see below).
Make sure all fields of an IPv6 address are initialized, which
guarantees that the IPv4 fields are also initialized.
Eric Dumazet [Wed, 16 Aug 2017 16:41:54 +0000 (09:41 -0700)]
tipc: fix use-after-free
syszkaller reported use-after-free in tipc [1]
When msg->rep skb is freed, set the pointer to NULL,
so that caller does not free it again.
[1]
==================================================================
BUG: KASAN: use-after-free in skb_push+0xd4/0xe0 net/core/skbuff.c:1466
Read of size 8 at addr ffff8801c6e71e90 by task syz-executor5/4115
Memory state around the buggy address: ffff8801c6e71d80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8801c6e71e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801c6e71e80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
^ ffff8801c6e71f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801c6e71f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
Memory state around the buggy address: ffff8801d2843a00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801d2843a80: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801d2843b00: 00 00 00 00 fc fc fc fc fb fb fb fb fc fc fc fc
^ ffff8801d2843b80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801d2843c00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
Fixes: cf124db566e6 ("net: Fix inconsistent teardown and release of private netdev state.") Signed-off-by: Eric Dumazet <[email protected]> Signed-off-by: David S. Miller <[email protected]>
Kees Cook [Fri, 18 Aug 2017 22:16:31 +0000 (15:16 -0700)]
mm: revert x86_64 and arm64 ELF_ET_DYN_BASE base changes
Moving the x86_64 and arm64 PIE base from 0x555555554000 to 0x000100000000
broke AddressSanitizer. This is a partial revert of:
eab09532d400 ("binfmt_elf: use ELF_ET_DYN_BASE only for PIE") 02445990a96e ("arm64: move ELF_ET_DYN_BASE to 4GB / 4MB")
The AddressSanitizer tool has hard-coded expectations about where
executable mappings are loaded.
The motivation for changing the PIE base in the above commits was to
avoid the Stack-Clash CVEs that allowed executable mappings to get too
close to heap and stack. This was mainly a problem on 32-bit, but the
64-bit bases were moved too, in an effort to proactively protect those
systems (proofs of concept do exist that show 64-bit collisions, but
other recent changes to fix stack accounting and setuid behaviors will
minimize the impact).
The new 32-bit PIE base is fine for ASan (since it matches the ET_EXEC
base), so only the 64-bit PIE base needs to be reverted to let x86 and
arm64 ASan binaries run again. Future changes to the 64-bit PIE base on
these architectures can be made optional once a more dynamic method for
dealing with AddressSanitizer is found. (e.g. always loading PIE into
the mmap region for marked binaries.)
Laura Abbott [Fri, 18 Aug 2017 22:16:27 +0000 (15:16 -0700)]
mm/vmalloc.c: don't unconditonally use __GFP_HIGHMEM
Commit 19809c2da28a ("mm, vmalloc: use __GFP_HIGHMEM implicitly") added
use of __GFP_HIGHMEM for allocations. vmalloc_32 may use
GFP_DMA/GFP_DMA32 which does not play nice with __GFP_HIGHMEM and will
trigger a BUG in gfp_zone.
Only add __GFP_HIGHMEM if we aren't using GFP_DMA/GFP_DMA32.
Bytes b4 ffff8801f582d750: ae 01 ff ff 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a ........ZZZZZZZZ
Object ffff8801f582d760: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff8801f582d770: 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkk.
Redzone ffff8801f582d778: bb bb bb bb bb bb bb bb ........
Padding ffff8801f582d8b8: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
Memory state around the buggy address: ffff8801f582d600: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801f582d680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801f582d700: fc fc fc fc fc fc fc fc fc fc fc fc fb fb fb fc
!shared memory policy is not protected against parallel removal by other
thread which is normally protected by the mmap_sem. do_get_mempolicy,
however, drops the lock midway while we can still access it later.
Early premature up_read is a historical artifact from times when
put_user was called in this path see https://lwn.net/Articles/124754/
but that is gone since 8bccd85ffbaf ("[PATCH] Implement sys_* do_*
layering in the memory policy layer."). but when we have the the
current mempolicy ref count model. The issue was introduced
accordingly.
Prakash Gupta [Fri, 18 Aug 2017 22:16:21 +0000 (15:16 -0700)]
mm/cma_debug.c: fix stack corruption due to sprintf usage
name[] in cma_debugfs_add_one() can only accommodate 16 chars including
NULL to store sprintf output. It's common for cma device name to be
larger than 15 chars. This can cause stack corrpution. If the gcc
stack protector is turned on, this can cause a panic due to stack
corruption.
Jamie Iles [Fri, 18 Aug 2017 22:16:18 +0000 (15:16 -0700)]
signal: don't remove SIGNAL_UNKILLABLE for traced tasks.
When forcing a signal, SIGNAL_UNKILLABLE is removed to prevent recursive
faults, but this is undesirable when tracing. For example, debugging an
init process (whether global or namespace), hitting a breakpoint and
SIGTRAP will force SIGTRAP and then remove SIGNAL_UNKILLABLE.
Everything continues fine, but then once debugging has finished, the
init process is left killable which is unlikely what the user expects,
resulting in either an accidentally killed init or an init that stops
reaping zombies.
Michal Hocko [Fri, 18 Aug 2017 22:16:15 +0000 (15:16 -0700)]
mm, oom: fix potential data corruption when oom_reaper races with writer
Wenwei Tao has noticed that our current assumption that the oom victim
is dying and never doing any visible changes after it dies, and so the
oom_reaper can tear it down, is not entirely true.
__task_will_free_mem consider a task dying when SIGNAL_GROUP_EXIT is set
but do_group_exit sends SIGKILL to all threads _after_ the flag is set.
So there is a race window when some threads won't have
fatal_signal_pending while the oom_reaper could start unmapping the
address space. Moreover some paths might not check for fatal signals
before each PF/g-u-p/copy_from_user.
We already have a protection for oom_reaper vs. PF races by checking
MMF_UNSTABLE. This has been, however, checked only for kernel threads
(use_mm users) which can outlive the oom victim. A simple fix would be
to extend the current check in handle_mm_fault for all tasks but that
wouldn't be sufficient because the current check assumes that a kernel
thread would bail out after EFAULT from get_user*/copy_from_user and
never re-read the same address which would succeed because the PF path
has established page tables already. This seems to be the case for the
only existing use_mm user currently (virtio driver) but it is rather
fragile in general.
This is even more fragile in general for more complex paths such as
generic_perform_write which can re-read the same address more times
(e.g. iov_iter_copy_from_user_atomic to fail and then
iov_iter_fault_in_readable on retry).
Therefore we have to implement MMF_UNSTABLE protection in a robust way
and never make a potentially corrupted content visible. That requires
to hook deeper into the PF path and check for the flag _every time_
before a pte for anonymous memory is established (that means all
!VM_SHARED mappings).
The corruption can be triggered artificially
(http://lkml.kernel.org/r/201708040646[email protected])
but there doesn't seem to be any real life bug report. The race window
should be quite tight to trigger most of the time.
Michal Hocko [Fri, 18 Aug 2017 22:16:12 +0000 (15:16 -0700)]
mm: fix double mmap_sem unlock on MMF_UNSTABLE enforced SIGBUS
Tetsuo Handa has noticed that MMF_UNSTABLE SIGBUS path in
handle_mm_fault causes a lockdep splat
Out of memory: Kill process 1056 (a.out) score 603 or sacrifice child
Killed process 1056 (a.out) total-vm:4268108kB, anon-rss:2246048kB, file-rss:0kB, shmem-rss:0kB
a.out (1169) used greatest stack depth: 11664 bytes left
DEBUG_LOCKS_WARN_ON(depth <= 0)
------------[ cut here ]------------
WARNING: CPU: 6 PID: 1339 at kernel/locking/lockdep.c:3617 lock_release+0x172/0x1e0
CPU: 6 PID: 1339 Comm: a.out Not tainted 4.13.0-rc3-next-20170803+ #142
Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/02/2015
RIP: 0010:lock_release+0x172/0x1e0
Call Trace:
up_read+0x1a/0x40
__do_page_fault+0x28e/0x4c0
do_page_fault+0x30/0x80
page_fault+0x28/0x30
The reason is that the page fault path might have dropped the mmap_sem
and returned with VM_FAULT_RETRY. MMF_UNSTABLE check however rewrites
the error path to VM_FAULT_SIGBUS and we always expect mmap_sem taken in
that path. Fix this by taking mmap_sem when VM_FAULT_RETRY is held in
the MMF_UNSTABLE path.
We cannot simply add VM_FAULT_SIGBUS to the existing error code because
all arch specific page fault handlers and g-u-p would have to learn a
new error code combination.
Vladimir Davydov [Fri, 18 Aug 2017 22:16:08 +0000 (15:16 -0700)]
slub: fix per memcg cache leak on css offline
To avoid a possible deadlock, sysfs_slab_remove() schedules an
asynchronous work to delete sysfs entries corresponding to the kmem
cache. To ensure the cache isn't freed before the work function is
called, it takes a reference to the cache kobject. The reference is
supposed to be released by the work function.
However, the work function (sysfs_slab_remove_workfn()) does nothing in
case the cache sysfs entry has already been deleted, leaking the kobject
and the corresponding cache.
This may happen on a per memcg cache destruction, because sysfs entries
of a per memcg cache are deleted on memcg offline if the cache is empty
(see __kmemcg_cache_deactivate()).
Pavel Tatashin [Fri, 18 Aug 2017 22:16:05 +0000 (15:16 -0700)]
mm: discard memblock data later
There is existing use after free bug when deferred struct pages are
enabled:
The memblock_add() allocates memory for the memory array if more than
128 entries are needed. See comment in e820__memblock_setup():
* The bootstrap memblock region count maximum is 128 entries
* (INIT_MEMBLOCK_REGIONS), but EFI might pass us more E820 entries
* than that - so allow memblock resizing.
This memblock memory is freed here:
free_low_memory_core_early()
We access the freed memblock.memory later in boot when deferred pages
are initialized in this path:
deferred_init_memmap()
for_each_mem_pfn_range()
__next_mem_pfn_range()
type = &memblock.memory;
One possible explanation for why this use-after-free hasn't been hit
before is that the limit of INIT_MEMBLOCK_REGIONS has never been
exceeded at least on systems where deferred struct pages were enabled.
Tested by reducing INIT_MEMBLOCK_REGIONS down to 4 from the current 128,
and verifying in qemu that this code is getting excuted and that the
freed pages are sane.
Recursive loops with module loading were previously handled in kmod by
restricting the number of modprobe calls to 50 and if that limit was
breached request_module() would return an error and a user would see the
following on their kernel dmesg:
request_module: runaway loop modprobe binfmt-464c
Starting init:/sbin/init exists but couldn't execute it (error -8)
This issue could happen for instance when a 64-bit kernel boots a 32-bit
userspace on some architectures and has no 32-bit binary format
hanlders. This is visible, for instance, when a CONFIG_MODULES enabled
64-bit MIPS kernel boots a into o32 root filesystem and the binfmt
handler for o32 binaries is not built-in.
After commit 6d7964a722af ("kmod: throttle kmod thread limit") we now
don't have any visible signs of an error and the kernel just waits for
the loop to end somehow.
Although this *particular* recursive loop could also be addressed by
doing a sanity check on search_binary_handler() and disallowing a
modular binfmt to be required for modprobe, a generic solution for any
recursive kernel kmod issues is still needed.
This should catch these loops. We can investigate each loop and address
each one separately as they come in, this however puts a stop gap for
them as before.
These are the few pending fixes I have queued up for v4.13-final. One
is a a generic regression fix for recursive loops on kmod and the other
one is a trivial print out correction.
During the v4.13 development we assumed that recursive kmod loops were
no longer possible. Clearly that is not true. The regression fix makes
use of a new killable wait. We use a killable wait to be paranoid in
how signals might be sent to modprobe and only accept a proper SIGKILL.
The signal will only be available to userspace to issue *iff* a thread
has already entered a wait state, and that happens only if we've already
throttled after 50 kmod threads have been hit.
Note that although it may seem excessive to trigger a failure afer 5
seconds if all kmod thread remain busy, prior to the series of changes
that went into v4.13 we would actually *always* fatally fail any request
which came in if the limit was already reached. The new waiting
implemented in v4.13 actually gives us *more* breathing room -- the wait
for 5 seconds is a wait for *any* kmod thread to finish. We give up and
fail *iff* no kmod thread has finished and they're *all* running
straight for 5 consecutive seconds. If 50 kmod threads are running
consecutively for 5 seconds something else must be really bad.
Recursive loops with kmod are bad but they're also hard to implement
properly as a selftest without currently fooling current userspace tools
like kmod [1]. For instance kmod will complain when you run depmod if
it finds a recursive loop with symbol dependency between modules as such
this type of recursive loop cannot go upstream as the modules_install
target will fail after running depmod.
These tests already exist on userspace kmod upstream though (refer to
the testsuite/module-playground/mod-loop-*.c files). The same is not
true if request_module() is used though, or worst if aliases are used.
Likewise the issue with 64-bit kernels booting 32-bit userspace without
a binfmt handler built-in is also currently not detected and proactively
avoided by userspace kmod tools, or kconfig for all architectures.
Although we could complain in the kernel when some of these individual
recursive issues creep up, proactively avoiding these situations in
userspace at build time is what we should keep striving for.
Lastly, since recursive loops could happen with kmod it may mean
recursive loops may also be possible with other kernel usermode helpers,
this should be investigated and long term if we can come up with a more
sensible generic solution even better!
Nicholas Piggin [Fri, 18 Aug 2017 22:15:51 +0000 (15:15 -0700)]
kernel/watchdog: fix Kconfig constraints for perf hardlockup watchdog
Commit 05a4a9527931 ("kernel/watchdog: split up config options") lost
the perf-based hardlockup detector's dependency on PERF_EVENTS, which
can result in broken builds with some powerpc configurations.
Restore the dependency. Add it in for x86 too, despite x86 always
selecting PERF_EVENTS it seems reasonable to make the dependency
explicit.
(gdb) l *(test_clear_page_writeback+0x12e)
0xffffffff811bae3e is in test_clear_page_writeback (./include/linux/memcontrol.h:619).
614 mod_node_page_state(page_pgdat(page), idx, val);
615 if (mem_cgroup_disabled() || !page->mem_cgroup)
616 return;
617 mod_memcg_state(page->mem_cgroup, idx, val);
618 pn = page->mem_cgroup->nodeinfo[page_to_nid(page)];
619 this_cpu_add(pn->lruvec_stat->count[idx], val);
620 }
621
622 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
623 gfp_t gfp_mask,
The issue is that writeback doesn't hold a page reference and the page
might get freed after PG_writeback is cleared (and the mapping is
unlocked) in test_clear_page_writeback(). The stat functions looking up
the page's node or zone are safe, as those attributes are static across
allocation and free cycles. But page->mem_cgroup is not, and it will
get cleared if we race with truncation or migration.
It appears this race window has been around for a while, but less likely
to trigger when the memcg stats were updated first thing after
PG_writeback is cleared. Recent changes reshuffled this code to update
the global node stats before the memcg ones, though, stretching the race
window out to an extent where people can reproduce the problem.
Update test_clear_page_writeback() to look up and pin page->mem_cgroup
before clearing PG_writeback, then not use that pointer afterward. It
is a partial revert of 62cccb8c8e7a ("mm: simplify lock_page_memcg()")
but leaves the pageref-holding callsites that aren't affected alone.
Matthew Dawson [Fri, 18 Aug 2017 19:04:54 +0000 (15:04 -0400)]
datagram: When peeking datagrams with offset < 0 don't skip empty skbs
Due to commit e6afc8ace6dd5cef5e812f26c72579da8806f5ac ("udp: remove
headers from UDP packets before queueing"), when udp packets are being
peeked the requested extra offset is always 0 as there is no need to skip
the udp header. However, when the offset is 0 and the next skb is
of length 0, it is only returned once. The behaviour can be seen with
the following python script:
Where the expected output should be the empty string twice.
Instead, make sk_peek_offset return negative values, and pass those values
to __skb_try_recv_datagram/__skb_try_recv_from_queue. If the passed offset
to __skb_try_recv_from_queue is negative, the checked skb is never skipped.
__skb_try_recv_from_queue will then ensure the offset is reset back to 0
if a peek is requested without an offset, unless no packets are found.
Also simplify the if condition in __skb_try_recv_from_queue. If _off is
greater then 0, and off is greater then or equal to skb->len, then
(_off || skb->len) must always be true assuming skb->len >= 0 is always
true.
Also remove a redundant check around a call to sk_peek_offset in af_unix.c,
as it double checked if MSG_PEEK was set in the flags.
V2:
- Moved the negative fixup into __skb_try_recv_from_queue, and remove now
redundant checks
- Fix peeking in udp{,v6}_recvmsg to report the right value when the
offset is 0
V3:
- Marked new branch in __skb_try_recv_from_queue as unlikely.
Linus Torvalds [Fri, 18 Aug 2017 21:12:39 +0000 (14:12 -0700)]
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe:
"A small set of fixes that should go into this release. This contains:
- An NVMe pull request from Christoph, with a few select fixes.
One of them fix a polling regression in this series, in which it's
trivial to cause the kernel to disable most of the hardware queue
interrupts.
- Fixup for a blk-mq queue usage imbalance on request allocation,
from Keith.
- A xen block pull request from Konrad, fixing two issues with
xen/xen-blkfront"
* 'for-linus' of git://git.kernel.dk/linux-block:
blk-mq-pci: add a fallback when pci_irq_get_affinity returns NULL
nvme-pci: set cqe_seen on polled completions
nvme-fabrics: fix reporting of unrecognized options
nvmet-fc: eliminate incorrect static markers on local variables
nvmet-fc: correct use after free on list teardown
nvmet: don't overwrite identify sn/fr with 0-bytes
xen-blkfront: use a right index when checking requests
xen: fix bio vec merging
blk-mq: Fix queue usage on failed request allocation
Linus Torvalds [Fri, 18 Aug 2017 19:35:22 +0000 (12:35 -0700)]
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma
Pull rdma fixes from Doug Ledford:
"Fourth set of -rc fixes for 4.13 cycle. This is all of the -rc fixes
that we know of. I suspect this will be the last rc pull request, but
you never know, I could be wrong.
Nothing major here. There are the i40iw patches I mentioned in my last
pull request minus one that I pulled out because it wasn't a fix and
not appropriate for the rc cycle. Then a few other items trickled in
and were added to the pull request. It's fairly small aside from those
five i40iw patches
- Set of five i40iw fixes (the first of these is rather large by line
count consideration, but I decided to send it because if fixes a
legitimate issue and the line count is because it does so by
creating a new function and using it where needed instead of just
patching up a few lines...a smaller fix could probably be done, but
the larger fix is the better code solution)
- One vmw_pvrdma fix
- One hns_roce fix (this silences a checker warning, but can't
actually happen, I expect a patch to remove this from all drivers
that share this same check in for-next)
- One iw_cxgb4 fix
- Two IB core fixes"
* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma:
IB/uverbs: Fix NULL pointer dereference during device removal
IB/core: Protect sysfs entry on ib_unregister_device
iw_cxgb4: fix misuse of integer variable
IB/hns: fix memory leak on ah on error return path
i40iw: Fix potential fcn_id_array out of bounds
i40iw: Use correct alignment for CQ0 memory
i40iw: Fix typecast of tcp_seq_num
i40iw: Correct variable names
i40iw: Fix parsing of query/commit FPM buffers
RDMA/vmw_pvrdma: Report CQ missed events
Linus Torvalds [Fri, 18 Aug 2017 18:11:03 +0000 (11:11 -0700)]
Merge tag 'powerpc-4.13-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Michael Ellerman:
"A bug in the VSX register saving that could cause userspace FP/VMX
register corruption.
Never seen to happen (that we know of), was found by code inspection,
but still tagged for stable given the consequences"
* tag 'powerpc-4.13-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc: Fix VSX enabling/flushing to also test MSR_FP and MSR_VEC
Linus Torvalds [Fri, 18 Aug 2017 18:02:49 +0000 (11:02 -0700)]
Merge tag 'sound-4.13-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"A collection of small fixes, mostly for regression fixes (sequencer
kconfig and emu10k1 probe) and device-specific quirks (three for USB
and one for HD-audio).
One significant change is a fix for races in ALSA sequencer core,
which covers over the previous incomplete fix"
* tag 'sound-4.13-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
ALSA: emu10k1: Fix forgotten user-copy conversion in init code
ALSA: usb-audio: add DSD support for new Amanero PID
ALSA: usb-audio: Add mute TLV for playback volumes on C-Media devices
ALSA: usb-audio: Apply sample rate quirk to Sennheiser headset
ALSA: seq: 2nd attempt at fixing race creating a queue
ALSA: hda/realtek - Fix pincfg for Dell XPS 13 9370
ALSA: seq: Fix CONFIG_SND_SEQ_MIDI dependency
Colin Ian King [Fri, 18 Aug 2017 13:12:06 +0000 (14:12 +0100)]
netxen: fix incorrect loop counter decrement
The loop counter k is currently being decremented from zero which
is incorrect. Fix this by incrementing k instead
Detected by CoverityScan, CID#401847 ("Infinite loop")
Fixes: 83f18a557c6d ("netxen_nic: fw dump support") Signed-off-by: Colin Ian King <[email protected]> Signed-off-by: David S. Miller <[email protected]>
Colin Ian King [Fri, 18 Aug 2017 11:11:50 +0000 (12:11 +0100)]
nfp: fix infinite loop on umapping cleanup
The while loop that performs the dma page unmapping never decrements
index counter f and hence loops forever. Fix this with a pre-decrement
on f.
Detected by CoverityScan, CID#1357309 ("Infinite loop")
Fixes: 4c3523623dc0 ("net: add driver for Netronome NFP4000/NFP6000 NIC VFs") Signed-off-by: Colin Ian King <[email protected]> Acked-by: Jakub Kicinski <[email protected]> Signed-off-by: David S. Miller <[email protected]>
Jiri Pirko [Fri, 18 Aug 2017 08:10:43 +0000 (10:10 +0200)]
net: sched: fix p_filter_chain check in tcf_chain_flush
The dereference before check is wrong and leads to an oops when
p_filter_chain is NULL. The check needs to be done on the pointer to
prevent NULL dereference.
blk-mq-pci: add a fallback when pci_irq_get_affinity returns NULL
While pci_irq_get_affinity should never fail for SMP kernel that
implement the affinity mapping, it will always return NULL in the
UP case, so provide a fallback mapping of all queues to CPU 0 in
that case.
Thomas Gleixner [Tue, 15 Aug 2017 07:50:13 +0000 (09:50 +0200)]
kernel/watchdog: Prevent false positives with turbo modes
The hardlockup detector on x86 uses a performance counter based on unhalted
CPU cycles and a periodic hrtimer. The hrtimer period is about 2/5 of the
performance counter period, so the hrtimer should fire 2-3 times before the
performance counter NMI fires. The NMI code checks whether the hrtimer
fired since the last invocation. If not, it assumess a hard lockup.
The calculation of those periods is based on the nominal CPU
frequency. Turbo modes increase the CPU clock frequency and therefore
shorten the period of the perf/NMI watchdog. With extreme Turbo-modes (3x
nominal frequency) the perf/NMI period is shorter than the hrtimer period
which leads to false positives.
A simple fix would be to shorten the hrtimer period, but that comes with
the side effect of more frequent hrtimer and softlockup thread wakeups,
which is not desired.
Implement a low pass filter, which checks the perf/NMI period against
kernel time. If the perf/NMI fires before 4/5 of the watchdog period has
elapsed then the event is ignored and postponed to the next perf/NMI.
That solves the problem and avoids the overhead of shorter hrtimer periods
and more frequent softlockup thread wakeups.
Marc Zyngier [Fri, 18 Aug 2017 09:53:45 +0000 (10:53 +0100)]
genirq: Restore trigger settings in irq_modify_status()
irq_modify_status starts by clearing the trigger settings from
irq_data before applying the new settings, but doesn't restore them,
leaving them to IRQ_TYPE_NONE.
That's pretty confusing to the potential request_irq() that could
follow. Instead, snapshot the settings before clearing them, and restore
them if the irq_modify_status() invocation was not changing the trigger.
Dave Gerlach [Fri, 28 Jul 2017 16:51:34 +0000 (09:51 -0700)]
soc: ti: ti_sci_pm_domains: Populate name for genpd
Commit b6a1d093f96b ("PM / Domains: Extend generic power domain
debugfs") now creates a debugfs directory for each genpd based on the
name of the genpd. Currently no name is given to the genpd created by
ti_sci_pm_domains driver so because of this we see a NULL pointer
dereferences when it is accessed on boot when the debugfs entry creation
is attempted.
Give the genpd a name before registering it to avoid this.
MAINTAINERS: Remove Jason Cooper's irqchip git tree
Jason's irqchip tree does not seem to have been updated for many months
now, remove it from the list of trees to avoid any possible confusion.
Jason says:
"Unfortunately, when I have time for irqchip, I don't always have the
time to properly follow up with pull-requests. So, for the time being,
I'll stick to reviewing as I can."
Takashi Iwai [Fri, 18 Aug 2017 08:55:10 +0000 (10:55 +0200)]
ALSA: emu10k1: Fix forgotten user-copy conversion in init code
The commit d42fe63d5839 ("ALSA: emu10k1: Get rid of set_fs() usage")
converted the user-space copy hack with set_fs() to the direct
memcpy(), but one place was forgotten. This resulted in the error
from snd_emu10k1_init_efx(), eventually failed to load the driver.
Fix the missing piece.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=196687 Fixes: d42fe63d5839 ("ALSA: emu10k1: Get rid of set_fs() usage") Signed-off-by: Takashi Iwai <[email protected]>
There is no guarantee that the various isync's involved with
the context switch will order the update of the CPU mask with
the first TLB entry for the new context being loaded by the HW.
Be safe here and add a memory barrier to order any subsequent
load/store which may bring entries into the TLB.
The corresponding barrier on the other side already exists as
pte updates use pte_xchg() which uses __cmpxchg_u64 which has
a sync after the atomic operation.
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