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authorDan Williams <dan.j.williams@intel.com>2017-11-30 03:10:14 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-30 05:40:42 +0300
commite7fe7b5cae90cf85bb6fed5ec5d4c5cf311a4fe9 (patch)
tree8019ca6ee6cd5adbe2bea8f7313c5601a2f87c7f /mm
parente4e40e0263ea6a3bfefbfd15d1b6ff5c03f2b95e (diff)
downloadlinux-e7fe7b5cae90cf85bb6fed5ec5d4c5cf311a4fe9.tar.xz
mm: replace pud_write with pud_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 pud_write is must be referencing user-memory. [dan.j.williams@intel.com: fix powerpc compile error] Link: http://lkml.kernel.org/r/151129127237.37405.16073414520854722485.stgit@dwillia2-desk3.amr.corp.intel.com Link: http://lkml.kernel.org/r/151043110453.2842.2166049702068628177.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: "David S. Miller" <davem@davemloft.net> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/huge_memory.c2
-rw-r--r--mm/memory.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index f22401fd83b5..4fe2491056a0 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1019,7 +1019,7 @@ struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
assert_spin_locked(pud_lockptr(mm, pud));
- if (flags & FOLL_WRITE && !pud_write(*pud))
+ if (!pud_access_permitted(*pud, flags & FOLL_WRITE))
return NULL;
if (pud_present(*pud) && pud_devmap(*pud))
diff --git a/mm/memory.c b/mm/memory.c
index b10c1d26f675..25d283d46ea3 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4013,7 +4013,7 @@ static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
/* NUMA case for anonymous PUDs would go here */
- if (dirty && !pud_write(orig_pud)) {
+ if (dirty && !pud_access_permitted(orig_pud, WRITE)) {
ret = wp_huge_pud(&vmf, orig_pud);
if (!(ret & VM_FAULT_FALLBACK))
return ret;