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x86/speculation/l1tf: Invert all not present mappings

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commit f22cc87f6c 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: 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 9eb0a3cce0
commit a5f284feeb
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)
{
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. */