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    Subject[ 009/123] arm64: Make !dirty ptes read-only
    Date
    3.7-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Catalin Marinas <catalin.marinas@arm.com>

    commit 33eaa58f854770dc9c98411a356c98e3a53edfda upstream.

    The AArch64 Linux port relies on the mm code to wrprotect clean ptes.
    This however is not the case with newly created ptes and
    PAGE_SHARED(_EXEC) is writable but !dirty.

    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/arm64/include/asm/pgtable.h | 2 ++
    1 file changed, 2 insertions(+)

    --- a/arch/arm64/include/asm/pgtable.h
    +++ b/arch/arm64/include/asm/pgtable.h
    @@ -159,6 +159,8 @@ static inline void set_pte_at(struct mm_
    {
    if (pte_present_exec_user(pte))
    __sync_icache_dcache(pte, addr);
    + if (!pte_dirty(pte))
    + pte = pte_wrprotect(pte);
    set_pte(ptep, pte);
    }




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