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    Subject[PATCH v3] ARM: 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>
    ---
    v3:
    - re-reorganize, drop use of pmd_sect; suggested by Catalin Marinas.
    v2:
    - reorganize, suggested by Catalin Marinas.
    ---
    arch/arm/mm/dump.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/arch/arm/mm/dump.c b/arch/arm/mm/dump.c
    index 2b342177f5de..61cc78ae9f21 100644
    --- 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]));
    }
    }

    --
    1.7.9.5

    --
    Kees Cook
    Chrome OS Security


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