x86/mm/pageattr: Always dump the right page table in an oops

Now that we have EFI-specific page tables we need to lookup the pgd when
dumping those page tables, rather than assuming that swapper_pgdir is
the current pgdir.

Remove the double underscore prefix, which is usually reserved for
static functions.

Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 6dea040cc3a1..6055a2001b27 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -584,8 +584,13 @@ show_fault_oops(struct pt_regs *regs, unsigned long error_code,
 
         if (error_code & PF_INSTR) {
                 unsigned int level;
+                pgd_t *pgd;
+                pte_t *pte;
 
-                pte_t *pte = lookup_address(address, &level);
+                pgd = __va(read_cr3() & PHYSICAL_PAGE_MASK);
+                pgd += pgd_index(address);
+
+                pte = lookup_address_in_pgd(pgd, address, &level);
 
                 if (pte && pte_present(*pte) && !pte_exec(*pte))
                         printk(nx_warning, from_kuid(&init_user_ns, current_uid()));