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58284a901b
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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
..
boot ARM: Devicetree updates 2020-10-24 10:44:18 -07:00
configs ARM: SoC defconfig updates 2020-10-24 10:53:04 -07:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2020-10-13 08:50:16 -07:00
include arm64: errata: Fix handling of 1418040 with late CPU onlining 2020-11-10 13:09:39 +00:00
kernel arm64: smp: Tell RCU about CPUs that fail to come online 2020-11-10 13:11:44 +00:00
kvm arm64: Add workaround for Arm Cortex-A77 erratum 1508412 2020-10-29 12:56:01 +00:00
lib arm64: Change .weak to SYM_FUNC_START_WEAK_PI for arch/arm64/lib/mem*.S 2020-10-30 08:32:31 +00:00
mm arm64/mm: Validate hotplug range before creating linear mapping 2020-11-13 09:45:08 +00:00
net arm64: bpf: Fix branch offset in JIT 2020-09-17 12:05:36 +01:00
xen arm64: xen: Use modern annotations for assembly functions 2020-01-09 16:09:42 +00:00
Kbuild
Kconfig arm64: NUMA: Kconfig: Increase NODES_SHIFT to 4 2020-11-03 09:31:53 +00:00
Kconfig.debug arm64: remove TEXT_OFFSET randomization 2020-06-15 13:10:59 +01:00
Kconfig.platforms ARM: Devicetree updates 2020-10-24 10:44:18 -07:00
Makefile More arm64 updates for 5.10 2020-10-23 09:46:16 -07:00