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| author |   Dan Williams <dan.j.williams@intel.com> | 2017-11-29 16:10:18 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-29 18:40:42 -0800 |
| commit | c7da82b894e9eef60a04a15f065a8502341bf13b (patch) | |
| tree | c59fd3cca98b6247bcd36f2cea370c3ce746b4e2 /mm/gup.c | |
| parent | mm: replace pud_write with pud_access_permitted in fault + gup paths (diff) | |
| download | linux-dev-c7da82b894e9eef60a04a15f065a8502341bf13b.tar.xz linux-dev-c7da82b894e9eef60a04a15f065a8502341bf13b.zip | |
mm: replace pmd_write with pmd_access_permitted in fault + gup paths
The 'access_permitted' helper is used in the gup-fast path and goes
beyond the simple _PAGE_RW check to also:
- validate that the mapping is writable from a protection keys
standpoint
- validate that the pte has _PAGE_USER set since all fault paths where
pmd_write is must be referencing user-memory.
Link: http://lkml.kernel.org/r/151043111049.2842.15241454964150083466.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/gup.c')
0 files changed, 0 insertions, 0 deletions