Messages in this thread Patch in this message |  | | Date | Thu, 13 Feb 2014 11:52:30 -0800 | From | Kees Cook <> | Subject | [PATCH v3] ARM: mm: report both sections from PMD |
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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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