x86/mm: Use WRITE_ONCE() when setting PTEs

commit 9bc4f28af75a91aea0ae383f50b0a430c4509303 upstream.

When page-table entries are set, the compiler might optimize their
assignment by using multiple instructions to set the PTE. This might
turn into a security hazard if the user somehow manages to use the
interim PTE. L1TF does not make our lives easier, making even an interim
non-present PTE a security hazard.

Using WRITE_ONCE() to set PTEs and friends should prevent this potential
security hazard.

I skimmed the differences in the binary with and without this patch. The
differences are (obviously) greater when CONFIG_PARAVIRT=n as more
code optimizations are possible. For better and worse, the impact on the
binary with this patch is pretty small. Skimming the code did not cause
anything to jump out as a security hazard, but it seems that at least
move_soft_dirty_pte() caused set_pte_at() to use multiple writes.

Signed-off-by: Nadav Amit <namit@vmware.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20180902181451.80520-1-namit@vmware.com
[bwh: Backported to 4.14:
 - Drop changes in pmdp_establish()
 - 5-level paging is a compile-time option
 - Update both cases in native_set_pgd()
 - Adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index ef938583147ea4d7775c23427f8b13e77ae1a21a..3a33de4133d114c64ecfa3ff84c81db5ce6c9f22 100644 (file)
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -56,15 +56,15 @@ struct mm_struct;
 void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte);
 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
 
-static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
-                                   pte_t *ptep)
+static inline void native_set_pte(pte_t *ptep, pte_t pte)
 {
-       *ptep = native_make_pte(0);
+       WRITE_ONCE(*ptep, pte);
 }
 
-static inline void native_set_pte(pte_t *ptep, pte_t pte)
+static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
+                                   pte_t *ptep)
 {
-       *ptep = pte;
+       native_set_pte(ptep, native_make_pte(0));
 }
 
 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
@@ -74,7 +74,7 @@ static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
 
 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
 {
-       *pmdp = pmd;
+       WRITE_ONCE(*pmdp, pmd);
 }
 
 static inline void native_pmd_clear(pmd_t *pmd)
@@ -110,7 +110,7 @@ static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
 
 static inline void native_set_pud(pud_t *pudp, pud_t pud)
 {
-       *pudp = pud;
+       WRITE_ONCE(*pudp, pud);
 }
 
 static inline void native_pud_clear(pud_t *pud)
@@ -220,9 +220,9 @@ static inline pgd_t pti_set_user_pgd(pgd_t *pgdp, pgd_t pgd)
 static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
 {
 #if defined(CONFIG_PAGE_TABLE_ISOLATION) && !defined(CONFIG_X86_5LEVEL)
-       p4dp->pgd = pti_set_user_pgd(&p4dp->pgd, p4d.pgd);
+       WRITE_ONCE(p4dp->pgd, pti_set_user_pgd(&p4dp->pgd, p4d.pgd));
 #else
-       *p4dp = p4d;
+       WRITE_ONCE(*p4dp, p4d);
 #endif
 }
 
@@ -238,9 +238,9 @@ static inline void native_p4d_clear(p4d_t *p4d)
 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 {
 #ifdef CONFIG_PAGE_TABLE_ISOLATION
-       *pgdp = pti_set_user_pgd(pgdp, pgd);
+       WRITE_ONCE(*pgdp, pti_set_user_pgd(pgdp, pgd));
 #else
-       *pgdp = pgd;
+       WRITE_ONCE(*pgdp, pgd);
 #endif
 }
 

diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index aafd4edfa2ac6416b4332fa171658dcf4428d85b..b4fd36271f906083635c20b421a2889116a88796 100644 (file)
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -260,7 +260,7 @@ static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp)
                if (pgd_val(pgd) != 0) {
                        pmd_t *pmd = (pmd_t *)pgd_page_vaddr(pgd);
 
-                       pgdp[i] = native_make_pgd(0);
+                       pgd_clear(&pgdp[i]);
 
                        paravirt_release_pmd(pgd_val(pgd) >> PAGE_SHIFT);
                        pmd_free(mm, pmd);
@@ -430,7 +430,7 @@ int ptep_set_access_flags(struct vm_area_struct *vma,
        int changed = !pte_same(*ptep, entry);
 
        if (changed && dirty)
-               *ptep = entry;
+               set_pte(ptep, entry);
 
        return changed;
 }
@@ -445,7 +445,7 @@ int pmdp_set_access_flags(struct vm_area_struct *vma,
        VM_BUG_ON(address & ~HPAGE_PMD_MASK);
 
        if (changed && dirty) {
-               *pmdp = entry;
+               set_pmd(pmdp, entry);
                /*
                 * We had a write-protection fault here and changed the pmd
                 * to to more permissive. No need to flush the TLB for that,
@@ -465,7 +465,7 @@ int pudp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
        VM_BUG_ON(address & ~HPAGE_PUD_MASK);
 
        if (changed && dirty) {
-               *pudp = entry;
+               set_pud(pudp, entry);
                /*
                 * We had a write-protection fault here and changed the pud
                 * to to more permissive. No need to flush the TLB for that,