linux-kernel - [PATCH v3 1/1] arm64: mm: correct the inside linear map range during hotplug check

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Message-Id: <20210216150351.129018-2-pasha.tatashin@soleen.com>
Date:   Tue, 16 Feb 2021 10:03:51 -0500
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     pasha.tatashin@...een.com, tyhicks@...ux.microsoft.com,
        jmorris@...ei.org, catalin.marinas@....com, will@...nel.org,
        akpm@...ux-foundation.org, anshuman.khandual@....com,
        rppt@...nel.org, logang@...tatee.com, ardb@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        mhocko@...e.com, linux-mm@...ck.org
Subject: [PATCH v3 1/1] arm64: mm: correct the inside linear map range during hotplug check

Memory hotplug may fail on systems with CONFIG_RANDOMIZE_BASE because the
linear map range is not checked correctly.

The start physical address that linear map covers can be actually at the
end of the range because of randomization. Check that and if so reduce it
to 0.

This can be verified on QEMU with setting kaslr-seed to ~0ul:

memstart_offset_seed = 0xffff
START: __pa(_PAGE_OFFSET(vabits_actual)) = ffff9000c0000000
END:   __pa(PAGE_END - 1) =  1000bfffffff

Signed-off-by: Pavel Tatashin <pasha.tatashin@...een.com>
Fixes: 58284a901b42 ("arm64/mm: Validate hotplug range before creating linear mapping")
Tested-by: Tyler Hicks <tyhicks@...ux.microsoft.com>
---
 arch/arm64/mm/mmu.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index ef7698c4e2f0..0d9c115e427f 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1447,6 +1447,22 @@ static void __remove_pgd_mapping(pgd_t *pgdir, unsigned long start, u64 size)
 struct range arch_get_mappable_range(void)
 {
 	struct range mhp_range;
+	u64 start_linear_pa = __pa(_PAGE_OFFSET(vabits_actual));
+	u64 end_linear_pa = __pa(PAGE_END - 1);
+
+	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
+		/*
+		 * Check for a wrap, it is possible because of randomized linear
+		 * mapping the start physical address is actually bigger than
+		 * the end physical address. In this case set start to zero
+		 * because [0, end_linear_pa] range must still be able to cover
+		 * all addressable physical addresses.
+		 */
+		if (start_linear_pa > end_linear_pa)
+			start_linear_pa = 0;
+	}
+
+	WARN_ON(start_linear_pa > end_linear_pa);
 
 	/*
 	 * Linear mapping region is the range [PAGE_OFFSET..(PAGE_END - 1)]
@@ -1454,8 +1470,9 @@ struct range arch_get_mappable_range(void)
 	 * range which can be mapped inside this linear mapping range, must
 	 * also be derived from its end points.
 	 */
-	mhp_range.start = __pa(_PAGE_OFFSET(vabits_actual));
-	mhp_range.end =  __pa(PAGE_END - 1);
+	mhp_range.start = start_linear_pa;
+	mhp_range.end =  end_linear_pa;
+
 	return mhp_range;
 }
 
-- 
2.25.1