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a0e6e0831c516860fc7f9be1db6c081fe902ebcf
android_kernel_xiaomi_sm8450/arch/x86/kernel
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Kirill A. Shutemov a0e6e0831c x86/ldt: Unmap PTEs for the slot before freeing LDT pages 
modify_ldt(2) leaves the old LDT mapped after switching over to the new
one. The old LDT gets freed and the pages can be re-used.

Leaving the mapping in place can have security implications. The mapping is
present in the userspace page tables and Meltdown-like attacks can read
these freed and possibly reused pages.

It's relatively simple to fix: unmap the old LDT and flush TLB before
freeing the old LDT memory.

This further allows to avoid flushing the TLB in map_ldt_struct() as the
slot is unmapped and flushed by unmap_ldt_struct() or has never been mapped
at all.

[ tglx: Massaged changelog and removed the needless line breaks ]

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>
Cc: bp@alien8.de
Cc: hpa@zytor.com
Cc: dave.hansen@linux.intel.com
Cc: luto@kernel.org
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/20181026122856.66224-3-kirill.shutemov@linux.intel.com
2018-11-06 21:35:11 +01:00
..
acpi
memblock: stop using implicit alignment to SMP_CACHE_BYTES
2018-10-31 08:54:16 -07:00
apic
memblock: stop using implicit alignment to SMP_CACHE_BYTES
2018-10-31 08:54:16 -07:00
cpu
acpi/nfit, x86/mce: Validate a MCE's address before using it
2018-11-06 19:13:26 +01:00
fpu
x86/fpu: Remove second definition of fpu in __fpu__restore_sig()
2018-10-17 12:30:31 +02:00
kprobes
Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-10-23 18:43:04 +01:00
.gitignore
…
alternative.c
Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-10-23 17:54:58 +01:00
amd_gart_64.c
dma-mapping: merge direct and noncoherent ops
2018-09-20 09:01:15 +02:00
amd_nb.c
x86/pci, x86/amd_nb: Add Hygon Dhyana support to PCI and northbridge
2018-09-27 18:28:58 +02:00
apb_timer.c
…
aperture_64.c
x86/gart: Exclude GART aperture from vmcore
2018-01-11 15:09:24 +01:00
apm_32.c
x86/APM: Fix build warning when PROC_FS is not enabled
2018-09-15 10:16:25 +02:00
asm-offsets_32.c
x86/entry/32: Load task stack from x86_tss.sp1 in SYSENTER handler
2018-07-20 01:11:36 +02:00
asm-offsets_64.c
x86/paravirt: Move the pv_irq_ops under the PARAVIRT_XXL umbrella
2018-09-03 16:50:36 +02:00
asm-offsets.c
Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-10-23 18:43:04 +01:00
audit_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bootflag.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
check.c
x86/corruption-check: Use pr_*() instead of printk()
2018-09-10 14:47:33 +02:00
cpuid.c
x86/cpuid: Allow cpuid_read() to schedule
2018-03-27 12:01:48 +02:00
crash_dump_32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
crash_dump_64.c
kdump, proc/vmcore: Enable kdumping encrypted memory with SME enabled
2018-10-06 12:09:26 +02:00
crash.c
kexec_file, x86: move re-factored code to generic side
2018-04-13 17:10:27 -07:00
devicetree.c
x86: DT: use for_each_of_cpu_node iterator
2018-09-28 14:25:58 -05:00
doublefault.c
x86/entry: Fix assumptions that the HW TSS is at the beginning of cpu_tss
2017-12-17 13:59:55 +01:00
dumpstack_32.c
x86/dumpstack: Unify show_regs()
2018-03-08 12:04:59 +01:00
dumpstack_64.c
x86/dumpstack: Unify show_regs()
2018-03-08 12:04:59 +01:00
dumpstack.c
x86/process: Don't mix user/kernel regs in 64bit __show_regs()
2018-09-06 14:33:12 +02:00
e820.c
memblock: stop using implicit alignment to SMP_CACHE_BYTES
2018-10-31 08:54:16 -07:00
early_printk.c
x86/earlyprintk: Add a force option for pciserial device
2018-10-02 21:02:47 +02:00
early-quirks.c
Merge tag 'drm-intel-next-2018-07-19' of git://anongit.freedesktop.org/drm/drm-intel into drm-next
2018-07-20 12:29:24 +10:00
ebda.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
eisa.c
x86/EISA: Don't probe EISA bus for Xen PV guests
2018-09-11 23:36:50 +02:00
espfix_64.c
x86/espfix: Document use of _PAGE_GLOBAL
2018-04-09 18:27:33 +02:00
ftrace_32.S
x86/retpoline/ftrace: Convert ftrace assembler indirect jumps
2018-01-12 00:14:30 +01:00
ftrace_64.S
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-01-28 12:19:23 -08:00
ftrace.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
head32.c
x86/boot: Add ACPI RSDP address to setup_header
2018-10-10 10:44:22 +02:00
head64.c
x86: Clean up 'sizeof x' => 'sizeof(x)'
2018-10-29 07:13:28 +01:00
head_32.S
x86/pgtable/32: Allocate 8k page-tables when PTI is enabled
2018-07-20 01:11:41 +02:00
head_64.S
Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-10-23 17:54:58 +01:00
hpet.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
hw_breakpoint.c
perf/arch/x86: Implement hw_breakpoint_arch_parse()
2018-06-26 09:07:55 +02:00
i8237.c
x86/i8237: Register device based on FADT legacy boot flag
2018-04-27 16:44:29 +02:00
i8253.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
i8259.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
idt.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
io_delay.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ioport.c
x86/ioport: add ksys_ioperm() helper; remove in-kernel calls to sys_ioperm()
2018-04-02 20:16:12 +02:00
irq_32.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
irq_64.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
irq_work.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
irq.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
irqflags.S
x86/paravirt: Make native_save_fl() extern inline
2018-07-03 10:56:27 +02:00
irqinit.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
itmt.c
x86/headers: Remove duplicate #includes
2017-12-12 11:32:24 +01:00
jailhouse.c
x86: Convert x86_platform_ops to timespec64
2018-05-19 14:03:14 +02:00
jump_label.c
x86/jump_label: Switch to jump_entry accessors
2018-09-27 17:56:48 +02:00
kdebugfs.c
x86, mpparse, x86/acpi, x86/PCI, x86/dmi, SFI: Use memremap() for RAM mappings
2017-07-18 11:37:58 +02:00
kexec-bzimage64.c
Fix kexec forbidding kernels signed with keys in the secondary keyring to boot
2018-08-16 09:57:20 -07:00
kgdb.c
…
ksysfs.c
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
kvm.c
x86/paravirt: Use a single ops structure
2018-09-03 16:50:35 +02:00
kvmclock.c
Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-10-23 17:54:58 +01:00
ldt.c
x86/ldt: Unmap PTEs for the slot before freeing LDT pages
2018-11-06 21:35:11 +01:00
livepatch.c
…
machine_kexec_32.c
x86/kexec: Allocate 8k PGDs for PTI
2018-07-30 13:53:48 +02:00
machine_kexec_64.c
x86/mm: Stop pretending pgtable_l5_enabled is a variable
2018-05-19 11:56:57 +02:00
macros.S
x86/jump-labels: Macrofy inline assembly code to work around GCC inlining bugs
2018-10-06 15:52:17 +02:00
Makefile
x86/paravirt: Make native_save_fl() extern inline
2018-07-03 10:56:27 +02:00
mmconf-fam10h_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
module.c
x86: Add support for 64-bit place relative relocations
2018-09-27 17:56:47 +02:00
mpparse.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
msr.c
x86: Clean up 'sizeof x' => 'sizeof(x)'
2018-10-29 07:13:28 +01:00
nmi_selftest.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nmi.c
locking/atomics: COCCINELLE/treewide: Convert trivial ACCESS_ONCE() patterns to READ_ONCE()/WRITE_ONCE()
2017-10-25 11:01:08 +02:00
paravirt_patch_32.c
x86/paravirt: Remove unused _paravirt_ident_32
2018-10-30 09:55:31 +01:00
paravirt_patch_64.c
x86/paravirt: Remove unused _paravirt_ident_32
2018-10-30 09:55:31 +01:00
paravirt-spinlocks.c
x86/paravirt: Use a single ops structure
2018-09-03 16:50:35 +02:00
paravirt.c
x86/paravirt: Remove unused _paravirt_ident_32
2018-10-30 09:55:31 +01:00
pci-calgary_64.c
x86/dma: Remove dma_alloc_coherent_gfp_flags()
2018-03-20 10:01:58 +01:00
pci-dma.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
pci-iommu_table.c
x86/iommu: Use NULL instead of 0
2018-08-02 14:33:19 +02:00
pci-swiotlb.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
pcspeaker.c
x86/platform/pcspeaker: Use PTR_ERR_OR_ZERO() to fix ptr_ret.cocci warning
2018-07-24 09:46:42 +02:00
perf_regs.c
perf/x86: Store user space frame-pointer value on a sample
2018-05-25 08:11:12 +02:00
platform-quirks.c
x86/i8237: Register device based on FADT legacy boot flag
2018-04-27 16:44:29 +02:00
pmem.c
resource: Provide resource struct in resource walk callback
2017-11-07 15:35:57 +01:00
probe_roms.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
process_32.c
x86/process: Don't mix user/kernel regs in 64bit __show_regs()
2018-09-06 14:33:12 +02:00
process_64.c
x86/compat: Adjust in_compat_syscall() to generic code under !COMPAT
2018-11-01 12:59:25 +01:00
process.c
x86/entry/32: Enter the kernel via trampoline stack
2018-07-20 01:11:37 +02:00
ptrace.c
Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2018-10-24 11:22:39 +01:00
pvclock.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
quirks.c
x86/mce: Check for alternate indication of machine check recovery on Skylake
2018-06-07 22:22:12 +02:00
reboot_fixups_32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
reboot.c
x86/apic: Fix restoring boot IRQ mode in reboot and kexec/kdump
2018-02-17 11:47:45 +01:00
relocate_kernel_32.S
…
relocate_kernel_64.S
x86/kexec: Make kexec (mostly) work in 5-level paging mode
2018-01-31 08:39:40 +01:00
resource.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
rtc.c
x86: Convert x86_platform_ops to timespec64
2018-05-19 14:03:14 +02:00
setup_percpu.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
setup.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
signal_compat.c
signal: Add TRAP_UNK si_code for undiagnosted trap exceptions
2018-04-25 10:40:56 -05:00
signal.c
rseq: Avoid infinite recursion when delivering SIGSEGV
2018-06-22 19:04:22 +02:00
smp.c
x86/irq: Let interrupt handlers set kvm_cpu_l1tf_flush_l1d
2018-08-05 09:53:13 +02:00
smpboot.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
stacktrace.c
x86/stacktrace: Do not fail for ORC with regs on stack
2018-06-21 16:34:56 +02:00
step.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sys_x86_64.c
x86/compat: Adjust in_compat_syscall() to generic code under !COMPAT
2018-11-01 12:59:25 +01:00
sysfb_efi.c
…
sysfb_simplefb.c
…
sysfb.c
…
tboot.c
x86/pti: Make unpoison of pgd for trusted boot work for real
2018-01-11 23:36:59 +01:00
tce_64.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
time.c
Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-10-23 19:07:25 +01:00
tls.c
x86/ldt: Make the LDT mapping RO
2017-12-23 21:13:01 +01:00
tls.h
…
topology.c
x86/xen: Disable CPU0 hotplug for Xen PV
2018-09-12 21:15:02 +02:00
trace_clock.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
tracepoint.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
traps.c
x86/traps: Use format string with panic() call
2018-10-29 07:19:26 +01:00
tsc_msr.c
x86/cpu: Sanitize FAM6_ATOM naming
2018-10-02 10:14:32 +02:00
tsc_sync.c
Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-11-13 19:07:38 -08:00
tsc.c
Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-10-23 17:54:58 +01:00
umip.c
signal/x86: Use force_sig_fault where appropriate
2018-09-21 15:30:54 +02:00
unwind_frame.c
x86/unwind: Disable unwinder warnings on 32-bit
2017-10-10 12:49:49 +02:00
unwind_guess.c
x86/unwind: Add the ORC unwinder
2017-07-26 13:18:20 +02:00
unwind_orc.c
x86/unwind/orc: Detect the end of the stack
2018-06-21 16:34:56 +02:00
uprobes.c
signal: Properly deliver SIGSEGV from x86 uprobes
2018-09-11 21:18:53 +02:00
verify_cpu.S
x86/boot: Annotate verify_cpu() as a callable function
2017-09-28 09:39:03 +02:00
vm86_32.c
x86/mm/tlb: Add freed_tables argument to flush_tlb_mm_range
2018-10-09 16:51:12 +02:00
vmlinux.lds.S
Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-10-23 18:43:04 +01:00
vsmp_64.c
x86/paravirt: Move the pv_irq_ops under the PARAVIRT_XXL umbrella
2018-09-03 16:50:36 +02:00
x86_init.c
x86/acpi, x86/boot: Take RSDP address for boot params if available
2018-10-10 10:44:22 +02:00