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x86/speculation/l1tf: Invert all not present mappings

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commit f22cc87f6c1f771b57c407555cfefd811cdd9507 upstream

For kernel mappings PAGE_PROTNONE is not necessarily set for a non present
mapping, but the inversion logic explicitely checks for !PRESENT and
PROT_NONE.

Remove the PROT_NONE check and make the inversion unconditional for all not
present mappings.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andi Kleen 2018-08-07 15:09:36 -07:00 • committed by Greg Kroah-Hartman
parent 09049f022a
commit 0aae5fe841
1 changed files with 1 additions and 1 deletions
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2
arch/x86/include/asm/pgtable-invert.h
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@ -6,7 +6,7 @@
static inline bool __pte_needs_invert(u64 val) static inline bool __pte_needs_invert(u64 val)
{ {
return (val & (_PAGE_PRESENT|_PAGE_PROTNONE)) == _PAGE_PROTNONE; return !(val & _PAGE_PRESENT);
} }
/* Get a mask to xor with the page table entry to get the correct pfn. */ /* Get a mask to xor with the page table entry to get the correct pfn. */