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linux/arch/arm64/mm
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Anshuman Khandual 58284a901b arm64/mm: Validate hotplug range before creating linear mapping 
During memory hotplug process, the linear mapping should not be created for
a given memory range if that would fall outside the maximum allowed linear
range. Else it might cause memory corruption in the kernel virtual space.

Maximum linear mapping region is [PAGE_OFFSET..(PAGE_END -1)] accommodating
both its ends but excluding PAGE_END. Max physical range that can be mapped
inside this linear mapping range, must also be derived from its end points.

This ensures that arch_add_memory() validates memory hot add range for its
potential linear mapping requirements, before creating it with
__create_pgd_mapping().

Fixes: 4ab2150615 ("arm64: Add memory hotplug support")
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Steven Price <steven.price@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Link: https://lore.kernel.org/r/1605252614-761-1-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
2020-11-13 09:45:08 +00:00
..
cache.S arm64: mm: Use modern annotations for assembly functions 2020-01-08 12:23:38 +00:00
context.c arm64: mm: Pin down ASIDs for sharing mm with devices 2020-09-28 22:15:38 +01:00
copypage.c arm64: Avoid unnecessary clear_user_page() indirection 2020-09-04 12:46:06 +01:00
dma-mapping.c dma-mapping: merge <linux/dma-noncoherent.h> into <linux/dma-map-ops.h> 2020-10-06 07:07:06 +02:00
extable.c arm64: Improve diagnostics when trapping BRK with FAULT_BRK_IMM 2020-09-18 16:35:54 +01:00
fault.c arm64: Add workaround for Arm Cortex-A77 erratum 1508412 2020-10-29 12:56:01 +00:00
flush.c mm: introduce page_size() 2019-09-24 15:54:08 -07:00
hugetlbpage.c mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
init.c More arm64 updates for 5.10 2020-10-23 09:46:16 -07:00
ioremap.c mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
kasan_init.c arch, drivers: replace for_each_membock() with for_each_mem_range() 2020-10-13 18:38:35 -07:00
Makefile Merge branch 'for-next/mte' into for-next/core 2020-10-02 12:16:11 +01:00
mmap.c arm64, mm: move generic mmap layout functions to mm 2019-09-24 15:54:11 -07:00
mmu.c arm64/mm: Validate hotplug range before creating linear mapping 2020-11-13 09:45:08 +00:00
mteswap.c arm64: mte: Enable swap of tagged pages 2020-09-04 12:46:07 +01:00
numa.c memblock: use separate iterators for memory and reserved regions 2020-10-13 18:38:35 -07:00
pageattr.c arm64: mm: Fix missing-prototypes in pageattr.c 2020-09-18 14:33:46 +01:00
pgd.c mm: consolidate pgtable_cache_init() and pgd_cache_init() 2019-09-24 15:54:09 -07:00
physaddr.c
proc.S arm64: mte: CPU feature detection and initial sysreg configuration 2020-09-03 17:26:32 +01:00
ptdump.c Merge branch 'for-next/mte' into for-next/core 2020-10-02 12:16:11 +01:00
ptdump_debugfs.c arm64/mm: Hold memory hotplug lock while walking for kernel page table dump 2020-03-04 15:35:22 +00:00