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Kirill A. Shutemov d412ab7cfc x86/mm: Move LDT remap out of KASLR region on 5-level paging 
commit d52888aa27 upstream

On 5-level paging the LDT remap area is placed in the middle of the KASLR
randomization region and it can overlap with the direct mapping, the
vmalloc or the vmap area.

The LDT mapping is per mm, so it cannot be moved into the P4D page table
next to the CPU_ENTRY_AREA without complicating PGD table allocation for
5-level paging.

The 4 PGD slot gap just before the direct mapping is reserved for
hypervisors, so it cannot be used.

Move the direct mapping one slot deeper and use the resulting gap for the
LDT remap area. The resulting layout is the same for 4 and 5 level paging.

[ tglx: Massaged changelog ]

Fixes: f55f0501cb ("x86/pti: Put the LDT in its own PGD if PTI is on")
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Cc: bp@alien8.de
Cc: hpa@zytor.com
Cc: dave.hansen@linux.intel.com
Cc: peterz@infradead.org
Cc: boris.ostrovsky@oracle.com
Cc: jgross@suse.com
Cc: bhe@redhat.com
Cc: willy@infradead.org
Cc: linux-mm@kvack.org
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20181026122856.66224-2-kirill.shutemov@linux.intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2018-11-27 16:10:50 +01:00
..
ABI
x86/bugs, kvm: Introduce boot-time control of L1TF mitigations
2018-08-15 18:12:56 +02:00
accounting
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acpi
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admin-guide
x86/earlyprintk: Add a force option for pciserial device
2018-11-27 16:10:47 +01:00
aoe
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arm
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arm64
arm64: Add work around for Arm Cortex-A55 Erratum 1024718
2018-05-16 10:10:25 +02:00
auxdisplay
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backlight
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blackfin
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block
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blockdev
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bus-devices
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cdrom
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cgroup-v1
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cma
…
connector
…
console
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core-api
doc: Fix RCU's docbook options
2017-10-19 22:26:11 -04:00
cpu-freq
cpufreq: docs: Drop intel-pstate.txt from index.txt
2017-09-28 02:08:43 +02:00
cpuidle
…
cris
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crypto
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dev-tools
kmemcheck: rip it out
2018-02-22 15:42:24 +01:00
device-mapper
dm thin: fix documentation relative to low water mark threshold
2018-04-26 11:02:07 +02:00
devicetree
ARM: dts: at91: add new compatibility string for macb on sama5d3
2018-10-18 09:16:22 +02:00
dmaengine
…
doc-guide
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driver-api
PM: docs: Drop an excess character from devices.rst
2017-09-19 22:57:38 +02:00
driver-model
driver core: remove DRIVER_ATTR
2017-09-19 09:20:33 +02:00
early-userspace
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EDID
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extcon
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fault-injection
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fb
…
features
…
filesystems
ext4: correct documentation for grpid mount option
2018-02-22 15:42:26 +01:00
firmware_class
…
fmc
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fpga
…
frv
…
gpio
…
gpu
…
hid
…
hwmon
hwmon: (ina2xx) fix sysfs shunt resistor read access
2018-10-03 17:00:58 -07:00
i2c
i2c: i801: Add support for Intel Cedar Fork
2017-10-05 14:44:56 +02:00
ia64
…
ide
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iio
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infiniband
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input
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ioctl
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isdn
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kbuild
kbuild: delete INSTALL_FW_PATH from kbuild documentation
2018-07-17 11:39:30 +02:00
kdump
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kernel-hacking
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laptops
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leds
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lightnvm
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livepatch
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locking
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m68k
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md
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media
media: media colorspaces*.rst: rename AdobeRGB to opRGB
2018-11-13 11:15:12 -08:00
memory-devices
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metag
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mic
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mips
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misc-devices
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mmc
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mn10300
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mtd
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namespaces
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netlabel
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networking
inet: frags: break the 2GB limit for frags storage
2018-09-19 22:43:46 +02:00
nfc
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nios2
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nvdimm
…
nvmem
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parisc
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PCI
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pcmcia
…
perf
…
phy
…
platform
…
power
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powerpc
…
pps
drivers/pps: aesthetic tweaks to PPS-related content
2017-09-08 18:26:51 -07:00
process
kbuild: verify that $DEPMOD is installed
2018-08-17 21:01:10 +02:00
pti
…
ptp
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rapidio
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RCU
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s390
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scheduler
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scsi
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security
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serial
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sh
…
sound
…
sparc
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sphinx
Documentation/sphinx: Fix Directive import error
2018-03-15 10:54:32 +01:00
sphinx-static
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spi
…
sysctl
Merge tag 'seccomp-v4.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2017-09-22 16:16:41 -10:00
target
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thermal
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timers
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trace
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translations
kokr/memory-barriers.txt: Apply atomic_t.txt change
2017-09-08 10:10:53 -06:00
usb
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userspace-api
Documentation/spec_ctrl: Do some minor cleanups
2018-05-22 18:54:04 +02:00
virtual
KVM: x86: Add a framework for supporting MSR-based features
2018-08-15 18:12:59 +02:00
vm
hmm: heterogeneous memory management documentation
2017-09-08 18:26:45 -07:00
w1
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watchdog
watchdog: Revert "iTCO_wdt: all versions count down twice"
2017-09-09 17:41:24 +02:00
wimax
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x86
x86/mm: Move LDT remap out of KASLR region on 5-level paging
2018-11-27 16:10:50 +01:00
xtensa
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.gitignore
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00-INDEX
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atomic_bitops.txt
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atomic_t.txt
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bcache.txt
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bt8xxgpio.txt
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btmrvl.txt
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bus-virt-phys-mapping.txt
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cachetlb.txt
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cgroup-v2.txt
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Changes
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circular-buffers.txt
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clk.txt
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CodingStyle
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conf.py
docs-rst: don't require adjustbox anymore
2017-09-08 10:02:55 -06:00
cpu-load.txt
…
cputopology.txt
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crc32.txt
…
dcdbas.txt
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debugging-modules.txt
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debugging-via-ohci1394.txt
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dell_rbu.txt
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digsig.txt
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DMA-API-HOWTO.txt
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DMA-API.txt
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DMA-attributes.txt
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DMA-ISA-LPC.txt
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docutils.conf
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dontdiff
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efi-stub.txt
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eisa.txt
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errseq.rst
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flexible-arrays.txt
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futex-requeue-pi.txt
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gcc-plugins.txt
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highuid.txt
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hw_random.txt
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hwspinlock.txt
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index.rst
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intel_txt.txt
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Intel-IOMMU.txt
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io_ordering.txt
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io-mapping.txt
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iostats.txt
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IPMI.txt
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IRQ-affinity.txt
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IRQ-domain.txt
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IRQ.txt
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irqflags-tracing.txt
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isa.txt
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isapnp.txt
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kernel-doc-nano-HOWTO.txt
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kernel-per-CPU-kthreads.txt
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kobject.txt
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kprobes.txt
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kref.txt
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ldm.txt
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lockup-watchdogs.txt
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logo.gif
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logo.txt
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lsm.txt
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lzo.txt
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mailbox.txt
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Makefile
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memory-barriers.txt
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memory-hotplug.txt
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men-chameleon-bus.txt
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nommu-mmap.txt
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ntb.txt
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numastat.txt
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padata.txt
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parport-lowlevel.txt
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percpu-rw-semaphore.txt
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phy.txt
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pi-futex.txt
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pnp.txt
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preempt-locking.txt
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printk-formats.txt
lib/vsprintf: Remove atomic-unsafe support for %pCr
2018-07-03 11:24:48 +02:00
pwm.txt
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rbtree.txt
rbtree: cache leftmost node internally
2017-09-08 18:26:48 -07:00
remoteproc.txt
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rfkill.txt
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robust-futex-ABI.txt
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robust-futexes.txt
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rpmsg.txt
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rtc.txt
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SAK.txt
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sgi-ioc4.txt
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siphash.txt
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SM501.txt
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smsc_ece1099.txt
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speculation.txt
Documentation: Document array_index_nospec
2018-02-07 11:12:22 -08:00
static-keys.txt
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SubmittingPatches
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svga.txt
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switchtec.txt
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sync_file.txt
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tee.txt
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this_cpu_ops.txt
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unaligned-memory-access.txt
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vfio-mediated-device.txt
vfio/mdev: Check globally for duplicate devices
2018-08-03 07:50:22 +02:00
vfio.txt
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video-output.txt
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xillybus.txt
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xz.txt
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zorro.txt
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