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Commit cca0f22c authored by Shrenuj Bansal's avatar Shrenuj Bansal
Browse files

ion: Set the page private bit on secure buffers 



Set the private page bit on each sg of secure buffers to inform
other entities, which import these buffers as an fd, that this
memory is secure.

Change-Id: I767c26fa1feca7505bbb3293cfdb4e09520496a6
Signed-off-by: default avatarShrenuj Bansal <shrenujb@codeaurora.org>
parent 6dd22195

drivers/staging/android/ion/ion_system_secure_heap.c

+15 −0
Original line number Diff line number Diff line
@@ -52,9 +52,12 @@ static int get_secure_vmid(unsigned long flags) 
static void ion_system_secure_heap_free(struct ion_buffer *buffer)

{

	int ret = 0;

	int i;

	u32 source_vm;

	int dest_vmid;

	int dest_perms;

	struct sg_table *sgt;

	struct scatterlist *sg;

	struct ion_heap *heap = buffer->heap;

	struct ion_system_secure_heap *secure_heap = container_of(heap,

						struct ion_system_secure_heap,
@@ -76,6 +79,10 @@ static void ion_system_secure_heap_free(struct ion_buffer *buffer) 
		return;

	}



	sgt = buffer->priv_virt;

	for_each_sg(sgt->sgl, sg, sgt->nents, i)

		ClearPagePrivate(sg_page(sg));



	buffer->heap = secure_heap->sys_heap;

	secure_heap->sys_heap->ops->free(buffer);

}
@@ -86,9 +93,12 @@ static int ion_system_secure_heap_allocate(struct ion_heap *heap, 
					unsigned long flags)

{

	int ret = 0;

	int i;

	u32 source_vm;

	int dest_vmid;

	int dest_perms;

	struct sg_table *sgt;

	struct scatterlist *sg;

	struct ion_system_secure_heap *secure_heap = container_of(heap,

						struct ion_system_secure_heap,

						heap);
@@ -123,6 +133,11 @@ static int ion_system_secure_heap_allocate(struct ion_heap *heap, 
		pr_err("%s: Assign call failed\n", __func__);

		goto err;

	}



	sgt = buffer->priv_virt;

	for_each_sg(sgt->sgl, sg, sgt->nents, i)

		SetPagePrivate(sg_page(sg));



	return ret;



err: