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Message-Id: <20180626142245.82850-2-kirill.shutemov@linux.intel.com>
Date: Tue, 26 Jun 2018 17:22:28 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Tom Lendacky <thomas.lendacky@....com>
Cc: Dave Hansen <dave.hansen@...el.com>,
Kai Huang <kai.huang@...ux.intel.com>,
Jacob Pan <jacob.jun.pan@...ux.intel.com>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv4 01/18] mm: Do no merge VMAs with different encryption KeyIDs
VMAs with different KeyID do not mix together. Only VMAs with the same
KeyID are compatible.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.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 a0fbb9ffe380..ebf4bd8bd0bf 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1541,6 +1541,13 @@ 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 d1eb87ef4b1a..7823eb264cc0 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);
}
/*
--
2.18.0
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