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Message-Id: <20170809200755.11234-7-tycho@docker.com>
Date: Wed, 9 Aug 2017 14:07:51 -0600
From: Tycho Andersen <tycho@...ker.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
kernel-hardening@...ts.openwall.com,
Marco Benatto <marco.antonio.780@...il.com>,
Juerg Haefliger <juerg.haefliger@...onical.com>,
Juerg Haefliger <juerg.haefliger@....com>
Subject: [PATCH v5 06/10] arm64/mm: Disable section mappings if XPFO is enabled
From: Juerg Haefliger <juerg.haefliger@....com>
XPFO (eXclusive Page Frame Ownership) doesn't support section mappings
yet, so disable it if XPFO is turned on.
Signed-off-by: Juerg Haefliger <juerg.haefliger@...onical.com>
Tested-by: Tycho Andersen <tycho@...ker.com>
---
arch/arm64/mm/mmu.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index f1eb15e0e864..38026b3ccb46 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -176,6 +176,18 @@ static void alloc_init_cont_pte(pmd_t *pmd, unsigned long addr,
} while (addr = next, addr != end);
}
+static inline bool use_section_mapping(unsigned long addr, unsigned long next,
+ unsigned long phys)
+{
+ if (IS_ENABLED(CONFIG_XPFO))
+ return false;
+
+ if (((addr | next | phys) & ~SECTION_MASK) != 0)
+ return false;
+
+ return true;
+}
+
static void init_pmd(pud_t *pud, unsigned long addr, unsigned long end,
phys_addr_t phys, pgprot_t prot,
phys_addr_t (*pgtable_alloc)(void), int flags)
@@ -190,7 +202,7 @@ static void init_pmd(pud_t *pud, unsigned long addr, unsigned long end,
next = pmd_addr_end(addr, end);
/* try section mapping first */
- if (((addr | next | phys) & ~SECTION_MASK) == 0 &&
+ if (use_section_mapping(addr, next, phys) &&
(flags & NO_BLOCK_MAPPINGS) == 0) {
pmd_set_huge(pmd, phys, prot);
--
2.11.0
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