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Commit 4656dfb6 authored by Andi Kleen's avatar Andi Kleen Committed by Greg Kroah-Hartman
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x86/speculation/l1tf: Invert all not present mappings 



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: default avatarAndi Kleen <ak@linux.intel.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarDavid Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c504b9fc

arch/x86/include/asm/pgtable-invert.h

+1 −1
Original line number Diff line number Diff line
@@ -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. */