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    Subject[PATCH 5.10 152/167] nds32: fix up stack guard gap
    Date
    From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    commit c453db6cd96418c79702eaf38259002755ab23ff upstream.

    Commit 1be7107fbe18 ("mm: larger stack guard gap, between vmas") fixed
    up all architectures to deal with the stack guard gap. But when nds32
    was added to the tree, it forgot to do the same thing.

    Resolve this by properly fixing up the nsd32's version of
    arch_get_unmapped_area()

    Cc: Nick Hu <nickhu@andestech.com>
    Cc: Greentime Hu <green.hu@gmail.com>
    Cc: Vincent Chen <deanbo422@gmail.com>
    Cc: Michal Hocko <mhocko@suse.com>
    Cc: Hugh Dickins <hughd@google.com>
    Cc: Qiang Liu <cyruscyliu@gmail.com>
    Cc: stable <stable@vger.kernel.org>
    Reported-by: iLifetruth <yixiaonn@gmail.com>
    Acked-by: Hugh Dickins <hughd@google.com>
    Link: https://lore.kernel.org/r/20210629104024.2293615-1-gregkh@linuxfoundation.org
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/nds32/mm/mmap.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/nds32/mm/mmap.c
    +++ b/arch/nds32/mm/mmap.c
    @@ -59,7 +59,7 @@ arch_get_unmapped_area(struct file *filp

    vma = find_vma(mm, addr);
    if (TASK_SIZE - len >= addr &&
    - (!vma || addr + len <= vma->vm_start))
    + (!vma || addr + len <= vm_start_gap(vma)))
    return addr;
    }


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