[PATCHv3 01/17] mm: Do no merge VMAs with different encryption KeyIDs

Kirill A. Shutemov
2018-06-12T14:40:33Z

VMAs with different KeyID do not mix together. Only VMAs with the same
KeyID are compatible.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/mm.h | 7 +++++++
mm/mmap.c | 3 ++-
2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 02a616e2f17d..1c3c15f37ed6 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1492,6 +1492,13 @@ static inline bool vma_is_anonymous(struct vm_area_struct *vma)
return !vma->vm_ops;
}

+#ifndef vma_keyid
+static inline int vma_keyid(struct vm_area_struct *vma)
+{
+ return 0;
+}
+#endif
+
#ifdef CONFIG_SHMEM
/*
* The vma_is_shmem is not inline because it is used only by slow
diff --git a/mm/mmap.c b/mm/mmap.c
index d817764a9974..3ff89fc1752b 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1217,7 +1217,8 @@ static int anon_vma_compatible(struct vm_area_struct *a, struct vm_area_struct *
mpol_equal(vma_policy(a), vma_policy(b)) &&
a->vm_file == b->vm_file &&
!((a->vm_flags ^ b->vm_flags) & ~(VM_READ|VM_WRITE|VM_EXEC|VM_SOFTDIRTY)) &&
- b->vm_pgoff == a->vm_pgoff + ((b->vm_start - a->vm_start) >> PAGE_SHIFT);
+ b->vm_pgoff == a->vm_pgoff + ((b->vm_start - a->vm_start) >> PAGE_SHIFT) &&
+ vma_keyid(a) == vma_keyid(b);
}

/*
--
2.17.1