Merge "ion: Ensure non-HLOS memory cannot be mapped by CPU"

drivers/staging/android/ion/ion_cma_heap.c

@@ -313,14 +313,37 @@ err:
 	return ret;
 }
 
+static void *ion_secure_cma_map_kernel(struct ion_heap *heap,
+				       struct ion_buffer *buffer)
+{
+	if (!is_buffer_hlos_assigned(buffer)) {
+		pr_info("%s: Mapping non-HLOS accessible buffer disallowed\n",
+			__func__);
+		return NULL;
+	}
+	return ion_cma_map_kernel(heap, buffer);
+}
+
+static int ion_secure_cma_map_user(struct ion_heap *mapper,
+				   struct ion_buffer *buffer,
+				   struct vm_area_struct *vma)
+{
+	if (!is_buffer_hlos_assigned(buffer)) {
+		pr_info("%s: Mapping non-HLOS accessible buffer disallowed\n",
+			__func__);
+		return -EINVAL;
+	}
+	return ion_cma_mmap(mapper, buffer, vma);
+}
+
 static struct ion_heap_ops ion_secure_cma_ops = {
 	.allocate = ion_secure_cma_allocate,
 	.free = ion_secure_cma_free,
 	.map_dma = ion_cma_heap_map_dma,
 	.unmap_dma = ion_cma_heap_unmap_dma,
 	.phys = ion_cma_phys,
-	.map_user = ion_cma_mmap,
+	.map_user = ion_secure_cma_map_user,
-	.map_kernel = ion_cma_map_kernel,
+	.map_kernel = ion_secure_cma_map_kernel,
 	.unmap_kernel = ion_cma_unmap_kernel,
 	.print_debug = ion_cma_print_debug,
 };

drivers/staging/android/ion/ion_system_heap.c

@@ -99,6 +99,11 @@ size_t ion_system_heap_secure_page_pool_total(struct ion_heap *heap,
 	return total << PAGE_SHIFT;
 }
 
+static int ion_heap_is_system_heap_type(enum ion_heap_type type)
+{
+	return type == ((enum ion_heap_type)ION_HEAP_TYPE_SYSTEM);
+}
+
 static struct page *alloc_buffer_page(struct ion_system_heap *heap,
 				      struct ion_buffer *buffer,
 				      unsigned long order,
@@ -352,6 +357,13 @@ static int ion_system_heap_allocate(struct ion_heap *heap,
 	int vmid = get_secure_vmid(buffer->flags);
 	struct device *dev = heap->priv;
 
+	if (ion_heap_is_system_heap_type(buffer->heap->type) &&
+	    is_secure_vmid_valid(vmid)) {
+		pr_info("%s: System heap doesn't support secure allocations\n",
+			__func__);
+		return -EINVAL;
+	}
+
 	if (align > PAGE_SIZE)
 		return -EINVAL;
 

drivers/staging/android/ion/ion_system_secure_heap.c

@@ -1,6 +1,6 @@
 /*
  *
- * Copyright (c) 2014-2017, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2014-2018 The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -170,14 +170,15 @@ out:
 	sys_heap->ops->free(&buffer);
 }
 
-static void process_one_shrink(struct ion_heap *sys_heap,
+static void process_one_shrink(struct ion_system_secure_heap *secure_heap,
+			       struct ion_heap *sys_heap,
 			       struct prefetch_info *info)
 {
 	struct ion_buffer buffer;
 	size_t pool_size, size;
 	int ret;
 
-	buffer.heap = sys_heap;
+	buffer.heap = &secure_heap->heap;
 	buffer.flags = info->vmid;
 
 	pool_size = ion_system_heap_secure_page_pool_total(sys_heap,
@@ -192,6 +193,7 @@ static void process_one_shrink(struct ion_heap *sys_heap,
 	}
 
 	buffer.private_flags = ION_PRIV_FLAG_SHRINKER_FREE;
+	buffer.heap = sys_heap;
 	sys_heap->ops->free(&buffer);
 }
 
@@ -211,7 +213,7 @@ static void ion_system_secure_heap_prefetch_work(struct work_struct *work)
 		spin_unlock_irqrestore(&secure_heap->work_lock, flags);
 
 		if (info->shrink)
-			process_one_shrink(sys_heap, info);
+			process_one_shrink(secure_heap, sys_heap, info);
 		else
 			process_one_prefetch(sys_heap, info);
 

drivers/staging/android/ion/msm/msm_ion.c

@@ -678,6 +678,21 @@ int get_secure_vmid(unsigned long flags)
 		return VMID_CP_SPSS_SP_SHARED;
 	return -EINVAL;
 }
+
+bool is_buffer_hlos_assigned(struct ion_buffer *buffer)
+{
+	bool is_hlos = false;
+
+	if (buffer->heap->type == (enum ion_heap_type)ION_HEAP_TYPE_HYP_CMA &&
+	    (buffer->flags & ION_FLAG_CP_HLOS))
+		is_hlos = true;
+
+	if (get_secure_vmid(buffer->flags) <= 0)
+		is_hlos = true;
+
+	return is_hlos;
+}
+
 /* fix up the cases where the ioctl direction bits are incorrect */
 static unsigned int msm_ion_ioctl_dir(unsigned int cmd)
 {

drivers/staging/android/ion/msm/msm_ion.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2016, 2018, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -175,6 +175,8 @@ int msm_ion_do_cache_offset_op(
 		void *vaddr, unsigned int offset, unsigned long len,
 		unsigned int cmd);
 
+bool is_buffer_hlos_assigned(struct ion_buffer *buffer);
+
 #else
 static inline struct ion_client *msm_ion_client_create(const char *name)
 {
@@ -202,6 +204,11 @@ int msm_ion_do_cache_offset_op(
 	return -ENODEV;
 }
 
+static bool is_buffer_hlos_assigned(struct ion_buffer *buffer)
+{
+	return true;
+}
+
 #endif /* CONFIG_ION */
 
 #endif