Changes since v1 [1]: * fix arm64 compilation, add __HAVE_ARCH_PUD_WRITE * fix sparc64 compilation, add __HAVE_ARCH_PUD_WRITE * fix s390 compilation, add a pud_write() helper
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Andrew,
Here is a third version to the pud_write() fix [2], and some follow-on patches to use the '_access_permitted' helpers in fault and get_user_pages() paths where we are checking if the thread has access to write. I explicitly omit conversions for places where the kernel is checking the _PAGE_RW flag for kernel purposes, not for userspace access.
Beyond fixing the crash, this series also fixes get_user_pages() and fault paths to honor protection keys in the same manner as get_user_pages_fast(). Only the crash fix is tagged for -stable as the protection key check is done just for consistency reasons since userspace can change protection keys at will.
[1]: https://lists.01.org/pipermail/linux-nvdimm/2017-November/013249.html [2]: https://lists.01.org/pipermail/linux-nvdimm/2017-November/013237.html
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Dan Williams (4): mm: fix device-dax pud write-faults triggered by get_user_pages() mm: replace pud_write with pud_access_permitted in fault + gup paths mm: replace pmd_write with pmd_access_permitted in fault + gup paths mm: replace pte_write with pte_access_permitted in fault + gup paths
arch/arm64/include/asm/pgtable.h | 1 + arch/s390/include/asm/pgtable.h | 6 ++++++ arch/sparc/include/asm/pgtable_64.h | 1 + arch/sparc/mm/gup.c | 4 ++-- arch/x86/include/asm/pgtable.h | 6 ++++++ fs/dax.c | 3 ++- include/asm-generic/pgtable.h | 9 +++++++++ include/linux/hugetlb.h | 8 -------- mm/gup.c | 2 +- mm/hmm.c | 8 ++++---- mm/huge_memory.c | 6 +++--- mm/memory.c | 8 ++++---- 12 files changed, 39 insertions(+), 23 deletions(-)