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    Subject[PATCH v5 10/27] mm/mmap: Prevent Shadow Stack VMA merges
    Date
    To prevent function call/return spills into the next shadow stack
    area, we do not merge shadow stack areas.

    Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
    ---
    mm/mmap.c | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/mm/mmap.c b/mm/mmap.c
    index 5f2b2b184c60..b85292014ec9 100644
    --- a/mm/mmap.c
    +++ b/mm/mmap.c
    @@ -1123,6 +1123,12 @@ struct vm_area_struct *vma_merge(struct mm_struct *mm,
    if (vm_flags & VM_SPECIAL)
    return NULL;

    + /*
    + * Do not merge shadow stack areas.
    + */
    + if (vm_flags & VM_SHSTK)
    + return NULL;
    +
    if (prev)
    next = prev->vm_next;
    else
    --
    2.17.1
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