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authorDan Williams <dan.j.williams@intel.com>2017-11-30 03:10:21 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-30 05:40:42 +0300
commit5c9d2d5c269c498aa9a546e8d2158a3e4142a1a2 (patch)
treeb8454bda3e8830a40159b89b2d8cdf3412d0ac25 /mm/hmm.c
parentc7da82b894e9eef60a04a15f065a8502341bf13b (diff)
downloadlinux-5c9d2d5c269c498aa9a546e8d2158a3e4142a1a2.tar.xz
mm: replace pte_write with pte_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 pte_write is must be referencing user-memory. Link: http://lkml.kernel.org/r/151043111604.2842.8051684481794973100.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/hmm.c')
-rw-r--r--mm/hmm.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/hmm.c b/mm/hmm.c
index 93718a391611..3a5c172af560 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -456,11 +456,11 @@ again:
continue;
}
- if (write_fault && !pte_write(pte))
+ if (!pte_access_permitted(pte, write_fault))
goto fault;
pfns[i] = hmm_pfn_t_from_pfn(pte_pfn(pte)) | flag;
- pfns[i] |= pte_write(pte) ? HMM_PFN_WRITE : 0;
+ pfns[i] |= pte_access_permitted(pte, WRITE) ? HMM_PFN_WRITE : 0;
continue;
fault: