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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2013-02-04 14:28:42 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-05 20:38:46 +1100 |
| commit | 85facf2570698ca6082326df4d63edebc9c9d96e (patch) | |
| tree | e70ca5a10d99ceb08afbbf3d7db754a5ffbaf8ab | |
| parent | a9bae189542e71f91e61a4428adf6e5a7dfe8063 (diff) | |
| download | op-kernel-dev-85facf2570698ca6082326df4d63edebc9c9d96e.zip op-kernel-dev-85facf2570698ca6082326df4d63edebc9c9d96e.tar.gz | |
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>
| -rw-r--r-- | mm/huge_memory.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 6001ee6..b5783d8 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1257,6 +1257,10 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, if (flags & FOLL_WRITE && !pmd_write(*pmd)) goto out; + /* Avoid dumping huge zero page */ + if ((flags & FOLL_DUMP) && is_huge_zero_pmd(*pmd)) + return ERR_PTR(-EFAULT); + page = pmd_page(*pmd); VM_BUG_ON(!PageHead(page)); if (flags & FOLL_TOUCH) { |
