[RFC v6 28/62] powerpc: check key protection for user page access
From: Ram Pai <hidden>
Date: 2017-07-16 04:08:36
Also in:
linux-arch, linux-mm, lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
Make sure that the kernel does not access user pages without checking their key-protection. Signed-off-by: Ram Pai <redacted> --- arch/powerpc/include/asm/book3s/64/pgtable.h | 14 ++++++++++++++ 1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 0056e58..425d98b 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h@@ -474,6 +474,20 @@ static inline void write_uamor(u64 value) #ifdef CONFIG_PPC64_MEMORY_PROTECTION_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_PPC64_MEMORY_PROTECTION_KEYS */ #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
--
1.7.1