4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Michal Hocko <mho...@suse.cz>
commit e14d7dfb41f5807a0c1c26a13f2b8ef16af24935 upstream
Jan has noticed that pte_pfn and co. resp. pfn_pte are incorrect for
CONFIG_PAE because phys_addr_t is wider than unsigned long and so the
pte_val reps. shift left would get truncated. Fix this up by using proper
types.
[dwmw2: Backport to 4.9]
Fixes: 6b28baca9b1f ("x86/speculation/l1tf: Protect PROT_NONE PTEs against
speculation")
Reported-by: Jan Beulich <jbeul...@suse.com>
Signed-off-by: Michal Hocko <mho...@suse.com>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Acked-by: Vlastimil Babka <vba...@suse.cz>
Signed-off-by: David Woodhouse <d...@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/x86/include/asm/pgtable.h | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -171,21 +171,21 @@ static inline u64 protnone_mask(u64 val)
static inline unsigned long pte_pfn(pte_t pte)
{
- unsigned long pfn = pte_val(pte);
+ phys_addr_t pfn = pte_val(pte);
pfn ^= protnone_mask(pfn);
return (pfn & PTE_PFN_MASK) >> PAGE_SHIFT;
}
static inline unsigned long pmd_pfn(pmd_t pmd)
{
- unsigned long pfn = pmd_val(pmd);
+ phys_addr_t pfn = pmd_val(pmd);
pfn ^= protnone_mask(pfn);
return (pfn & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
}
static inline unsigned long pud_pfn(pud_t pud)
{
- unsigned long pfn = pud_val(pud);
+ phys_addr_t pfn = pud_val(pud);
pfn ^= protnone_mask(pfn);
return (pfn & pud_pfn_mask(pud)) >> PAGE_SHIFT;
}
@@ -404,7 +404,7 @@ static inline pgprotval_t massage_pgprot
static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
{
- phys_addr_t pfn = page_nr << PAGE_SHIFT;
+ phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
pfn ^= protnone_mask(pgprot_val(pgprot));
pfn &= PTE_PFN_MASK;
return __pte(pfn | massage_pgprot(pgprot));
@@ -412,7 +412,7 @@ static inline pte_t pfn_pte(unsigned lon
static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
{
- phys_addr_t pfn = page_nr << PAGE_SHIFT;
+ phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
pfn ^= protnone_mask(pgprot_val(pgprot));
pfn &= PHYSICAL_PMD_PAGE_MASK;
return __pmd(pfn | massage_pgprot(pgprot));
