linux-kernel - [PATCH 4/4] iommu/vt-d: Do access checks before calling handle_mm

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Message-Id: <1447162006-20672-5-git-send-email-joro@8bytes.org>
Date:	Tue, 10 Nov 2015 14:26:46 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	iommu@...ts.linux-foundation.org
Cc:	Oded Gabbay <oded.gabbay@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 4/4] iommu/vt-d: Do access checks before calling handle_mm_fault()

From: Joerg Roedel <jroedel@...e.de>

Not doing so is a bug and might trigger a BUG_ON in
handle_mm_fault(). So add the proper permission checks
before calling into mm code.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/intel-svm.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index c69e3f9..4ebf097 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -484,6 +484,14 @@ struct page_req_dsc {
 };
 
 #define PRQ_RING_MASK ((0x1000 << PRQ_ORDER) - 0x10)
+
+static bool access_error(struct vm_area_struct *vma, struct page_req_dsc *req)
+{
+	return !((req->rd_req  && (vma->vm_flags & VM_READ))  ||
+		 (req->wr_req  && (vma->vm_flags & VM_WRITE)) ||
+		 (req->exe_req && (vma->vm_flags & VM_EXEC)));
+}
+
 static irqreturn_t prq_event_thread(int irq, void *d)
 {
 	struct intel_iommu *iommu = d;
@@ -539,6 +547,9 @@ static irqreturn_t prq_event_thread(int irq, void *d)
 		if (!vma || address < vma->vm_start)
 			goto invalid;
 
+		if (access_error(vma, req))
+			goto invalid;
+
 		ret = handle_mm_fault(svm->mm, vma, address,
 				      req->wr_req ? FAULT_FLAG_WRITE : 0);
 		if (ret & VM_FAULT_ERROR)
-- 
1.9.1

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