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linux-stable/arch/s390/include/asm
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Gerald Schaefer 63098a9306 s390/mm: fix dynamic pagetable upgrade for hugetlbfs 
commit 5f490a520b upstream.

Commit ee71d16d22 ("s390/mm: make TASK_SIZE independent from the number
of page table levels") changed the logic of TASK_SIZE and also removed the
arch_mmap_check() implementation for s390. This combination has a subtle
effect on how get_unmapped_area() for hugetlbfs pages works. It is now
possible that a user process establishes a hugetlbfs mapping at an address
above 4 TB, without triggering a dynamic pagetable upgrade from 3 to 4
levels.

This is because hugetlbfs mappings will not use mm->get_unmapped_area, but
rather file->f_op->get_unmapped_area, which currently is the generic
implementation of hugetlb_get_unmapped_area() that does not know about s390
dynamic pagetable upgrades, but with the new definition of TASK_SIZE, it
will now allow mappings above 4 TB.

Subsequent access to such a mapped address above 4 TB will result in a page
fault loop, because the CPU cannot translate such a large address with 3
pagetable levels. The fault handler will try to map in a hugepage at the
address, but due to the folded pagetable logic it will end up with creating
entries in the 3 level pagetable, possibly overwriting existing mappings,
and then it all repeats when the access is retried.

Apart from the page fault loop, this can have various nasty effects, e.g.
kernel panic from one of the BUG_ON() checks in memory management code,
or even data loss if an existing mapping gets overwritten.

Fix this by implementing HAVE_ARCH_HUGETLB_UNMAPPED_AREA support for s390,
providing an s390 version for hugetlb_get_unmapped_area() with pagetable
upgrade support similar to arch_get_unmapped_area(), which will then be
used instead of the generic version.

Fixes: ee71d16d22 ("s390/mm: make TASK_SIZE independent from the number of page table levels")
Cc: <stable@vger.kernel.org> # 4.12+
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-02-11 04:35:17 -08:00
..
fpu License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
airq.h s390/airq: use DMA memory for adapter interrupts 2019-06-15 12:25:05 +02:00
alternative-asm.h s390: add assembler macros for CPU alternatives 2018-03-28 08:38:27 +02:00
alternative.h s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
ap.h s390/zcrypt: Fix wrong dispatching for control domain CPRBs 2019-05-28 14:49:38 +02:00
appldata.h s390/appldata: pass parameter list pointer to appldata_asm 2018-10-09 11:20:50 +02:00
archrandom.h s390/archrandom: Rework arch random implementation. 2018-05-30 11:18:04 +02:00
asm-prototypes.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
atomic.h locking/atomic, s390: Use s64 for atomic64 2019-06-03 12:32:56 +02:00
atomic_ops.h s390/atomic,bitops: mark function(s) __always_inline 2019-10-04 16:37:33 +02:00
barrier.h s390: add optimized array_index_mask_nospec 2018-02-05 07:51:41 +01:00
bitops.h s390/atomic,bitops: mark function(s) __always_inline 2019-10-04 16:37:33 +02:00
boot_data.h s390/ipl: read IPL report at early boot 2019-04-26 12:34:05 +02:00
bug.h s390/bug: add entry size to the __bug_table section 2019-05-02 13:54:11 +02:00
bugs.h s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
cache.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ccwdev.h s390/cio: add basic protected virtualization support 2019-06-15 12:25:00 +02:00
ccwgroup.h s390/ccwgroup: add get_ccwgroupdev_by_busid() 2018-10-08 09:09:59 +02:00
checksum.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
chpid.h s390/cio: rename struct channel_path_desc 2018-03-26 16:13:11 +02:00
cio.h s390/cio: move struct node_descriptor to cio.h 2019-06-19 17:54:27 +02:00
clp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cmb.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cmpxchg.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat.h asm-generic: Move common compat types to asm-generic/compat.h 2018-08-29 15:42:20 +02:00
cpacf.h s390: mark __cpacf_query() as __always_inline 2019-10-04 16:37:33 +02:00
cpcmd.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cpu.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cpu_mcf.h s390/cpum_cf_diag: Add support for s390 counter facility diagnostic trace 2019-02-22 09:19:56 +01:00
cpu_mf-insn.h s390/cpu_mf: add store cpu counter multiple instruction support 2019-02-22 09:19:52 +01:00
cpu_mf.h s390/cpu_mf: mark function(s) __always_inline 2019-10-04 16:37:33 +02:00
cpufeature.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cputime.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
crw.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
css_chars.h s390/cio: sanitize css_general_characteristics definition 2018-06-12 15:14:05 +02:00
ctl_reg.h arch: replace _BITUL() in kernel-space headers with BIT() 2019-07-16 19:23:22 -07:00
current.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
debug.h docs: s390: unify and update s390dbf kdocs at debug.c 2019-07-05 13:42:22 +02:00
delay.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
diag.h s390/kernel: introduce .dma sections 2019-04-29 10:47:10 +02:00
dis.h s390/tools: generate header files in arch/s390/include/generated/ 2018-01-23 07:36:53 +01:00
dma.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dwarf.h s390/vdso: revise CFI annotations of vDSO functions 2017-12-13 10:51:36 +01:00
eadm.h s390/eadm: fix CONFIG_BLOCK include dependency 2018-02-02 10:47:14 +01:00
ebcdic.h s390: fix clang -Wpointer-sign warnigns in boot code 2019-05-03 17:17:58 +02:00
elf.h s390: report new CPU capabilities 2019-04-25 15:34:10 +02:00
exec.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
extable.h s390/kernel: introduce .dma sections 2019-04-29 10:47:10 +02:00
extmem.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
facility.h s390: fix stfle zero padding 2019-06-19 17:54:27 +02:00
fcx.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ftrace.h s390/ftrace: use HAVE_FUNCTION_GRAPH_RET_ADDR_PTR 2019-05-02 13:54:11 +02:00
futex.h s390: remove all code using the access register mode 2017-11-14 11:01:47 +01:00
gmap.h s390/mm: use refcount_t for refcount 2019-08-21 12:41:43 +02:00
hardirq.h softirq/s390: Move default mutators of overwritten softirq mask to s390 2018-05-14 11:25:28 +02:00
hugetlb.h s390/mm: fix -Wunused-but-set-variable warnings 2019-10-04 16:37:33 +02:00
hw_irq.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
idals.h s390/idal: use struct_size() in kmalloc() 2019-06-04 15:03:18 +02:00
idle.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
io.h s390/pci: provide support for MIO instructions 2019-04-29 10:47:01 +02:00
ipl.h s390/kernel: introduce .dma sections 2019-04-29 10:47:10 +02:00
irq.h s390/pci: gather statistics for floating vs directed irqs 2019-04-29 10:47:01 +02:00
irqflags.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
isc.h KVM: s390: add gib_alert_irq_handler() 2019-02-05 14:29:23 +01:00
itcw.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
jump_label.h s390/jump_label: mark function(s) __always_inline 2019-10-04 16:37:33 +02:00
kasan.h s390/kasan: add option for 4-level paging support 2018-10-09 11:21:29 +02:00
Kbuild Remove Mysterious Macro Intended to Obscure Weird Behaviours (mmiowb()) 2019-05-06 16:57:52 -07:00
kdebug.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
kexec.h s390/kernel: build a relocatable kernel 2019-04-29 10:47:10 +02:00
kprobes.h s390/kprobes: Remove jprobe implementation 2018-06-21 12:33:10 +02:00
kvm_host.h ARM: 2019-07-12 15:35:14 -07:00
kvm_para.h KVM: Introduce paravirtualization hints and KVM_HINTS_DEDICATED 2018-03-06 18:40:44 +01:00
linkage.h s390/kernel: introduce .dma sections 2019-04-29 10:47:10 +02:00
livepatch.h livepatch: Remove klp_check_compiler_support() 2019-05-10 17:53:29 -04:00
lowcore.h s390: fix clang -Wpointer-sign warnigns in boot code 2019-05-03 17:17:58 +02:00
mem_detect.h s390/mem_detect: provide single get_mem_detect_end 2019-08-26 12:51:18 +02:00
mem_encrypt.h s390/mm: Remove sev_active() function 2019-08-09 22:52:11 +10:00
mmu.h s390/vdso: avoid 64-bit vdso mapping for compat tasks 2018-09-20 13:20:29 +02:00
mmu_context.h s390/vdso: correct vdso mapping for compat tasks 2019-01-11 17:12:02 +01:00
mmzone.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
module.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nmi.h arch: replace _BITUL() in kernel-space headers with BIT() 2019-07-16 19:23:22 -07:00
nospec-branch.h s390: correct nospec auto detection init order 2018-04-11 17:46:00 +02:00
nospec-insn.h s390/nospec: rename assembler generated expoline thunks 2019-05-02 13:54:11 +02:00
numa.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
os_info.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
page-states.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
page.h s390/mm: fix dynamic pagetable upgrade for hugetlbfs 2020-02-11 04:35:17 -08:00
pci.h s390/pci: deal with devices that have no support for MIO instructions 2019-07-04 13:13:57 +02:00
pci_clp.h s390/pci: fix struct definition for set PCI function 2019-05-28 14:49:29 +02:00
pci_debug.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
pci_dma.h s390: move s390_pci_dma_ops to asm/pci_dma.h 2018-01-10 16:41:19 +01:00
pci_insn.h s390: fix setting of mio addressing control 2019-07-11 20:40:02 +02:00
pci_io.h s390/pci: move io address mapping code to pci_insn.c 2019-04-29 10:47:01 +02:00
percpu.h s390: enforce CONFIG_SMP 2019-06-07 10:09:37 +02:00
perf_event.h s390/cpum_sf: Support ioctl PERF_EVENT_IOC_PERIOD 2019-09-19 12:56:07 +02:00
pgalloc.h s390/mm: add mm_pxd_folded() checks to pxd_free() 2019-12-31 16:44:30 +01:00
pgtable.h s390/mm: properly clear _PAGE_NOEXEC bit when it is not supported 2019-12-17 19:56:16 +01:00
pkey.h s390/pkey: pkey cleanup: narrow in-kernel API, fix some variable types 2019-08-21 12:58:53 +02:00
pnet.h s390/net: move pnet constants 2019-02-07 18:06:18 -08:00
preempt.h preempt: Move PREEMPT_NEED_RESCHED definition into arch code 2018-12-07 12:35:46 +00:00
processor.h s390/base: remove unused s390_base_mcck_handler 2019-09-03 13:53:56 +02:00
ptrace.h arch: replace _BITUL() in kernel-space headers with BIT() 2019-07-16 19:23:22 -07:00
purgatory.h s390/purgatory: Remove duplicate variable definitions 2018-07-06 08:47:51 +02:00
qdio.h s390/qdio: clarify size of the QIB parm area 2019-10-01 09:41:36 +02:00
runtime_instr.h s390/runtime instrumentation: provide uapi header file 2018-02-02 10:47:15 +01:00
schid.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sclp.h s390/ipl: Fix detection of has_secure attribute 2019-07-11 20:40:02 +02:00
scsw.h s390: fix comment for scsw_cmd_is_valid_sctl 2018-02-22 15:31:24 +01:00
seccomp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sections.h locking/lockdep: check for freed initmem in static_obj() 2019-04-29 10:47:10 +02:00
serial.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
set_memory.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
setup.h s390 updates for the 5.4 merge window 2019-09-17 14:04:43 -07:00
shmparam.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
signal.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sigp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
smp.h s390: enforce CONFIG_HOTPLUG_CPU 2019-06-07 10:09:42 +02:00
sparsemem.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
spinlock.h s390: enforce CONFIG_SMP 2019-06-07 10:09:37 +02:00
spinlock_types.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
stacktrace.h s390/unwind: correct stack switching during unwind 2019-06-07 15:20:44 +02:00
stp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
string.h s390/kasan: provide uninstrumented __strlen 2019-08-21 12:58:52 +02:00
switch_to.h s390: always save and restore all registers on context switch 2017-12-05 07:51:08 +01:00
syscall.h audit/stable-5.2 PR 20190507 2019-05-07 19:06:04 -07:00
syscall_wrapper.h s390: syscall_wrapper: avoid clang warning 2019-04-11 13:36:51 +02:00
sysinfo.h s390/sysinfo: add and display licensed internal code identifier 2018-02-02 10:47:15 +01:00
termios.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
thread_info.h arch: replace _BITUL() in kernel-space headers with BIT() 2019-07-16 19:23:22 -07:00
timex.h s390/ftrace: fix endless recursion in function_graph tracer 2019-12-31 16:46:02 +01:00
tlb.h s390/tlb: Convert to generic mmu_gather 2019-04-03 10:32:57 +02:00
tlbflush.h s390: enforce CONFIG_SMP 2019-06-07 10:09:37 +02:00
topology.h s390/topology: fix compile error in file arch/s390/kernel/smp.c 2017-11-20 08:51:01 +01:00
uaccess.h s390/uaccess: avoid (false positive) compiler warnings 2019-10-11 12:27:25 +02:00
unistd.h s390: wire up clone3 system call 2019-07-23 10:45:53 +02:00
unwind.h s390/unwind: fix mixing regs and sp 2019-10-31 17:26:48 +01:00
uprobes.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
user.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
uv.h s390/uv: introduce guest side ultravisor code 2019-04-10 17:47:21 +02:00
vdso.h s390/vdso: add missing boot_vdso_data declaration 2017-11-14 22:07:49 +01:00
vga.h s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
vmlinux.lds.h s390: introduce .boot.preserved.data section 2019-04-10 17:47:09 +02:00
vtime.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vtimer.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vx-insn.h s390: add alignment hints to vector load and store 2019-02-07 11:57:10 +01:00
xor.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00