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thp: avoid dumping huge zero page
No reason to preserve the huge zero page in core dumps. Reported-by: Michel Lespinasse <walken@google.com> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reviewed-by: Michel Lespinasse <walken@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1257,6 +1257,10 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
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if (flags & FOLL_WRITE && !pmd_write(*pmd))
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goto out;
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/* Avoid dumping huge zero page */
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if ((flags & FOLL_DUMP) && is_huge_zero_pmd(*pmd))
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return ERR_PTR(-EFAULT);
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page = pmd_page(*pmd);
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VM_BUG_ON(!PageHead(page));
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if (flags & FOLL_TOUCH) {
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