ARM: 7963/1: mm: report both sections from PMD

On 2-level page table systems, the PMD has 2 section entries. Report
these, otherwise ARM_PTDUMP will miss reporting permission changes on
odd section boundaries.

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Steve Capper <steve.capper@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mm/dump.c b/arch/arm/mm/dump.c
index 2b3a564..ef69152 100644 (file)
--- a/arch/arm/mm/dump.c
+++ b/arch/arm/mm/dump.c
@@ -264,6 +264,9 @@ static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
                        note_page(st, addr, 3, pmd_val(*pmd));
                else
                        walk_pte(st, pmd, addr);
+
+               if (SECTION_SIZE < PMD_SIZE && pmd_large(pmd[1]))
+                       note_page(st, addr + SECTION_SIZE, 3, pmd_val(pmd[1]));
        }
 }