4.4-stable review patch. If anyone has any objections, please let me know.
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From: Michal Hocko mhocko@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.
[Just one chunk, again, needed here. Thanks to Ben and Guenter for finding and fixing this. - gregkh]
Fixes: 6b28baca9b1f ("x86/speculation/l1tf: Protect PROT_NONE PTEs against speculation") Reported-by: Jan Beulich JBeulich@suse.com Signed-off-by: Michal Hocko mhocko@suse.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Acked-by: Vlastimil Babka vbabka@suse.cz Cc: Guenter Roeck linux@roeck-us.net Cc: Ben Hutchings ben.hutchings@codethink.co.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/include/asm/pgtable.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -385,7 +385,7 @@ static inline pmd_t pfn_pmd(unsigned lon
static inline pud_t pfn_pud(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_PUD_PAGE_MASK; return __pud(pfn | massage_pgprot(pgprot));