linux-kernel - [PATCH] x86/mm: fix dump pagetables for 4 levels of page tables

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Date:   Wed, 12 Apr 2017 16:36:34 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     mingo@...hat.com, hpa@...or.com, tglx@...utronix.de,
        kirill.shutemov@...ux.intel.com, Juergen Gross <jgross@...e.com>
Subject: [PATCH] x86/mm: fix dump pagetables for 4 levels of page tables

Commit fdd3d8ce0ea62 ("x86/dump_pagetables: Add support for 5-level
paging") introduced an error for dumping with only 4 levels by setting
PGD_LEVEL_MULT to a wrong value.

This is leading to e.g. addresses printed as "(null)" for ranges:

x86/mm: Found insecure W+X mapping at address (null)/(null)

Signed-off-by: Juergen Gross <jgross@...e.com>
---
 arch/x86/mm/dump_pagetables.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index 9f305be71a72..bce6990b1d81 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -111,7 +111,7 @@ static struct addr_marker address_markers[] = {
 #define PMD_LEVEL_MULT (PTRS_PER_PTE * PTE_LEVEL_MULT)
 #define PUD_LEVEL_MULT (PTRS_PER_PMD * PMD_LEVEL_MULT)
 #define P4D_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
-#define PGD_LEVEL_MULT (PTRS_PER_PUD * P4D_LEVEL_MULT)
+#define PGD_LEVEL_MULT (PTRS_PER_P4D * P4D_LEVEL_MULT)
 
 #define pt_dump_seq_printf(m, to_dmesg, fmt, args...)		\
 ({								\
-- 
2.12.0