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Subject[PATCH v9 17/51] powerpc: check key protection for user page access
Date
Make sure that the kernel does not access user pages without
checking their key-protection.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
---
arch/powerpc/include/asm/book3s/64/pgtable.h | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index c277a63..5ecb846 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -464,6 +464,19 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,

#ifdef CONFIG_PPC_MEM_KEYS
extern bool arch_pte_access_permitted(u64 pte, bool write, bool execute);
+
+#define pte_access_permitted(pte, write) \
+ (pte_present(pte) && \
+ ((!(write) || pte_write(pte)) && \
+ arch_pte_access_permitted(pte_val(pte), !!write, 0)))
+
+/*
+ * We store key in pmd for huge tlb pages. So need to check for key protection.
+ */
+#define pmd_access_permitted(pmd, write) \
+ (pmd_present(pmd) && \
+ ((!(write) || pmd_write(pmd)) && \
+ arch_pte_access_permitted(pmd_val(pmd), !!write, 0)))
#endif /* CONFIG_PPC_MEM_KEYS */

#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
--
1.7.1
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