[PATCH 2/6] x86/mm/pageattr: Do not strip pte flags from cpa->pfn

Matt Fleming
2015-11-12T15:40:32Z

Removing the PAGE_NX bit from cpa->pfn will corrupt the page frame
number address rather than removing PAGE_NX as the code intends. This
is unlikley to be a problem in practice because _PAGE_BIT_NX is bit 63
and most machines do not have page frame numbers that reach that high.

Still, pte flags are never stored in cpa->pfn so we can safely delete
the code.

Cc: Borislav Petkov <bp@alien8.de>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
---
arch/x86/mm/pageattr.c | 5 -----
1 file changed, 5 deletions(-)

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 893921b12272..d5240be55915 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -885,11 +885,6 @@ static void populate_pte(struct cpa_data *cpa,
pte = pte_offset_kernel(pmd, start);

while (num_pages-- && start < end) {
-
- /* deal with the NX bit */
- if (!(pgprot_val(pgprot) & _PAGE_NX))
- cpa->pfn &= ~_PAGE_NX;
-
set_pte(pte, pfn_pte(cpa->pfn, pgprot));

start += PAGE_SIZE;
--
2.6.2