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authorAndi Kleen <ak@linux.intel.com>2018-08-07 15:09:37 -0700
committerThomas Gleixner <tglx@linutronix.de>2018-08-08 09:23:44 +0200
commit0768f91530ff46683e0b372df14fd79fe8d156e5 (patch)
tree07971e6c9631db7d4afd93ff1f0234c4313ff050 /arch/x86/include/asm/pgtable.h
parentx86/speculation/l1tf: Invert all not present mappings (diff)
downloadlinux-dev-0768f91530ff46683e0b372df14fd79fe8d156e5.tar.xz
linux-dev-0768f91530ff46683e0b372df14fd79fe8d156e5.zip
x86/speculation/l1tf: Make pmd/pud_mknotpresent() invert
Some cases in THP like: - MADV_FREE - mprotect - split mark the PMD non present for temporarily to prevent races. The window for an L1TF attack in these contexts is very small, but it wants to be fixed for correctness sake. Use the proper low level functions for pmd/pud_mknotpresent() to address this. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/include/asm/pgtable.h')
-rw-r--r--arch/x86/include/asm/pgtable.h22
1 files changed, 12 insertions, 10 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index df58cdbad841..13125aad804c 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -410,11 +410,6 @@ static inline pmd_t pmd_mkwrite(pmd_t pmd)
return pmd_set_flags(pmd, _PAGE_RW);
}
-static inline pmd_t pmd_mknotpresent(pmd_t pmd)
-{
- return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
-}
-
static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
{
pudval_t v = native_pud_val(pud);
@@ -469,11 +464,6 @@ static inline pud_t pud_mkwrite(pud_t pud)
return pud_set_flags(pud, _PAGE_RW);
}
-static inline pud_t pud_mknotpresent(pud_t pud)
-{
- return pud_clear_flags(pud, _PAGE_PRESENT | _PAGE_PROTNONE);
-}
-
#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
static inline int pte_soft_dirty(pte_t pte)
{
@@ -577,6 +567,18 @@ static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
return __pud(pfn | check_pgprot(pgprot));
}
+static inline pmd_t pmd_mknotpresent(pmd_t pmd)
+{
+ return pfn_pmd(pmd_pfn(pmd),
+ __pgprot(pmd_flags(pmd) & ~(_PAGE_PRESENT|_PAGE_PROTNONE)));
+}
+
+static inline pud_t pud_mknotpresent(pud_t pud)
+{
+ return pfn_pud(pud_pfn(pud),
+ __pgprot(pud_flags(pud) & ~(_PAGE_PRESENT|_PAGE_PROTNONE)));
+}
+
static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask);
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)