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// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2016-20 Intel Corporation. */
#include <linux/acpi.h>
#include <linux/miscdevice.h>
#include <linux/mman.h>
#include <linux/security.h>
#include <linux/suspend.h>
#include <asm/traps.h>
#include "driver.h"
#include "encl.h"
static int sgx_open(struct inode *inode, struct file *file)
{
struct sgx_encl *encl;
encl = kzalloc(sizeof(*encl), GFP_KERNEL);
if (!encl)
return -ENOMEM;
xa_init(&encl->page_array);
mutex_init(&encl->lock);
file->private_data = encl;
return 0;
}
static int sgx_release(struct inode *inode, struct file *file)
{
struct sgx_encl *encl = file->private_data;
struct sgx_encl_page *entry;
unsigned long index;
xa_for_each(&encl->page_array, index, entry) {
if (entry->epc_page) {
sgx_free_epc_page(entry->epc_page);
encl->secs_child_cnt--;
entry->epc_page = NULL;
}
kfree(entry);
}
xa_destroy(&encl->page_array);
if (!encl->secs_child_cnt && encl->secs.epc_page) {
sgx_free_epc_page(encl->secs.epc_page);
encl->secs.epc_page = NULL;
}
/* Detect EPC page leaks. */
WARN_ON_ONCE(encl->secs_child_cnt);
WARN_ON_ONCE(encl->secs.epc_page);
kfree(encl);
return 0;
}
static int sgx_mmap(struct file *file, struct vm_area_struct *vma)
{
struct sgx_encl *encl = file->private_data;
int ret;
ret = sgx_encl_may_map(encl, vma->vm_start, vma->vm_end, vma->vm_flags);
if (ret)
return ret;
vma->vm_ops = &sgx_vm_ops;
vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP | VM_IO;
vma->vm_private_data = encl;
return 0;
}
static unsigned long sgx_get_unmapped_area(struct file *file,
unsigned long addr,
unsigned long len,
unsigned long pgoff,
unsigned long flags)
{
if ((flags & MAP_TYPE) == MAP_PRIVATE)
return -EINVAL;
if (flags & MAP_FIXED)
return addr;
return current->mm->get_unmapped_area(file, addr, len, pgoff, flags);
}
#ifdef CONFIG_COMPAT
static long sgx_compat_ioctl(struct file *filep, unsigned int cmd,
unsigned long arg)
{
return sgx_ioctl(filep, cmd, arg);
}
#endif
static const struct file_operations sgx_encl_fops = {
.owner = THIS_MODULE,
.open = sgx_open,
.release = sgx_release,
.unlocked_ioctl = sgx_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = sgx_compat_ioctl,
#endif
.mmap = sgx_mmap,
.get_unmapped_area = sgx_get_unmapped_area,
};
static struct miscdevice sgx_dev_enclave = {
.minor = MISC_DYNAMIC_MINOR,
.name = "sgx_enclave",
.nodename = "sgx_enclave",
.fops = &sgx_encl_fops,
};
int __init sgx_drv_init(void)
{
if (!cpu_feature_enabled(X86_FEATURE_SGX_LC))
return -ENODEV;
return misc_register(&sgx_dev_enclave);
}
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