513 lines
12 KiB
C
513 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2015-2017, 2019-2021 Linaro Limited
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*/
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#include <linux/anon_inodes.h>
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#include <linux/device.h>
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#include <linux/idr.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/tee_drv.h>
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#include <linux/uaccess.h>
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#include <linux/uio.h>
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#include <linux/highmem.h>
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#include "tee_private.h"
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static void shm_put_kernel_pages(struct page **pages, size_t page_count)
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{
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size_t n;
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for (n = 0; n < page_count; n++)
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put_page(pages[n]);
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}
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static int shm_get_kernel_pages(unsigned long start, size_t page_count,
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struct page **pages)
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{
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struct page *page;
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size_t n;
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if (WARN_ON_ONCE(is_vmalloc_addr((void *)start) ||
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is_kmap_addr((void *)start)))
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return -EINVAL;
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page = virt_to_page((void *)start);
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for (n = 0; n < page_count; n++) {
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pages[n] = page + n;
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get_page(pages[n]);
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}
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return page_count;
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}
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static void release_registered_pages(struct tee_shm *shm)
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{
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if (shm->pages) {
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if (shm->flags & TEE_SHM_USER_MAPPED)
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unpin_user_pages(shm->pages, shm->num_pages);
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else
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shm_put_kernel_pages(shm->pages, shm->num_pages);
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kfree(shm->pages);
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}
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}
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static void tee_shm_release(struct tee_device *teedev, struct tee_shm *shm)
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{
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if (shm->flags & TEE_SHM_POOL) {
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teedev->pool->ops->free(teedev->pool, shm);
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} else if (shm->flags & TEE_SHM_DYNAMIC) {
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int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
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if (rc)
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dev_err(teedev->dev.parent,
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"unregister shm %p failed: %d", shm, rc);
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release_registered_pages(shm);
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}
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teedev_ctx_put(shm->ctx);
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kfree(shm);
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tee_device_put(teedev);
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}
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static struct tee_shm *shm_alloc_helper(struct tee_context *ctx, size_t size,
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size_t align, u32 flags, int id)
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{
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struct tee_device *teedev = ctx->teedev;
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struct tee_shm *shm;
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void *ret;
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int rc;
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if (!tee_device_get(teedev))
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return ERR_PTR(-EINVAL);
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if (!teedev->pool) {
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/* teedev has been detached from driver */
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ret = ERR_PTR(-EINVAL);
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goto err_dev_put;
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}
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shm = kzalloc(sizeof(*shm), GFP_KERNEL);
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if (!shm) {
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ret = ERR_PTR(-ENOMEM);
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goto err_dev_put;
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}
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refcount_set(&shm->refcount, 1);
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shm->flags = flags;
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shm->id = id;
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/*
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* We're assigning this as it is needed if the shm is to be
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* registered. If this function returns OK then the caller expected
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* to call teedev_ctx_get() or clear shm->ctx in case it's not
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* needed any longer.
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*/
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shm->ctx = ctx;
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rc = teedev->pool->ops->alloc(teedev->pool, shm, size, align);
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if (rc) {
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ret = ERR_PTR(rc);
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goto err_kfree;
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}
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teedev_ctx_get(ctx);
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return shm;
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err_kfree:
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kfree(shm);
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err_dev_put:
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tee_device_put(teedev);
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return ret;
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}
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/**
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* tee_shm_alloc_user_buf() - Allocate shared memory for user space
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* @ctx: Context that allocates the shared memory
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* @size: Requested size of shared memory
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*
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* Memory allocated as user space shared memory is automatically freed when
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* the TEE file pointer is closed. The primary usage of this function is
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* when the TEE driver doesn't support registering ordinary user space
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* memory.
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*
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* @returns a pointer to 'struct tee_shm'
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*/
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struct tee_shm *tee_shm_alloc_user_buf(struct tee_context *ctx, size_t size)
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{
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u32 flags = TEE_SHM_DYNAMIC | TEE_SHM_POOL;
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struct tee_device *teedev = ctx->teedev;
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struct tee_shm *shm;
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void *ret;
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int id;
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mutex_lock(&teedev->mutex);
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id = idr_alloc(&teedev->idr, NULL, 1, 0, GFP_KERNEL);
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mutex_unlock(&teedev->mutex);
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if (id < 0)
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return ERR_PTR(id);
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shm = shm_alloc_helper(ctx, size, PAGE_SIZE, flags, id);
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if (IS_ERR(shm)) {
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mutex_lock(&teedev->mutex);
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idr_remove(&teedev->idr, id);
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mutex_unlock(&teedev->mutex);
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return shm;
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}
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mutex_lock(&teedev->mutex);
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ret = idr_replace(&teedev->idr, shm, id);
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mutex_unlock(&teedev->mutex);
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if (IS_ERR(ret)) {
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tee_shm_free(shm);
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return ret;
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}
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return shm;
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}
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/**
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* tee_shm_alloc_kernel_buf() - Allocate shared memory for kernel buffer
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* @ctx: Context that allocates the shared memory
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* @size: Requested size of shared memory
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*
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* The returned memory registered in secure world and is suitable to be
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* passed as a memory buffer in parameter argument to
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* tee_client_invoke_func(). The memory allocated is later freed with a
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* call to tee_shm_free().
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*
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* @returns a pointer to 'struct tee_shm'
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*/
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struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size)
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{
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u32 flags = TEE_SHM_DYNAMIC | TEE_SHM_POOL;
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return shm_alloc_helper(ctx, size, PAGE_SIZE, flags, -1);
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}
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EXPORT_SYMBOL_GPL(tee_shm_alloc_kernel_buf);
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/**
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* tee_shm_alloc_priv_buf() - Allocate shared memory for a privately shared
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* kernel buffer
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* @ctx: Context that allocates the shared memory
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* @size: Requested size of shared memory
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*
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* This function returns similar shared memory as
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* tee_shm_alloc_kernel_buf(), but with the difference that the memory
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* might not be registered in secure world in case the driver supports
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* passing memory not registered in advance.
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*
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* This function should normally only be used internally in the TEE
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* drivers.
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*
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* @returns a pointer to 'struct tee_shm'
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*/
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struct tee_shm *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t size)
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{
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u32 flags = TEE_SHM_PRIV | TEE_SHM_POOL;
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return shm_alloc_helper(ctx, size, sizeof(long) * 2, flags, -1);
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}
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EXPORT_SYMBOL_GPL(tee_shm_alloc_priv_buf);
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static struct tee_shm *
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register_shm_helper(struct tee_context *ctx, unsigned long addr,
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size_t length, u32 flags, int id)
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{
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struct tee_device *teedev = ctx->teedev;
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struct tee_shm *shm;
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unsigned long start;
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size_t num_pages;
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void *ret;
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int rc;
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if (!tee_device_get(teedev))
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return ERR_PTR(-EINVAL);
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if (!teedev->desc->ops->shm_register ||
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!teedev->desc->ops->shm_unregister) {
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ret = ERR_PTR(-ENOTSUPP);
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goto err_dev_put;
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}
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teedev_ctx_get(ctx);
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shm = kzalloc(sizeof(*shm), GFP_KERNEL);
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if (!shm) {
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ret = ERR_PTR(-ENOMEM);
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goto err_ctx_put;
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}
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refcount_set(&shm->refcount, 1);
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shm->flags = flags;
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shm->ctx = ctx;
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shm->id = id;
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addr = untagged_addr(addr);
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start = rounddown(addr, PAGE_SIZE);
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shm->offset = addr - start;
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shm->size = length;
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num_pages = (roundup(addr + length, PAGE_SIZE) - start) / PAGE_SIZE;
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shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL);
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if (!shm->pages) {
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ret = ERR_PTR(-ENOMEM);
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goto err_free_shm;
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}
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if (flags & TEE_SHM_USER_MAPPED)
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rc = pin_user_pages_fast(start, num_pages, FOLL_WRITE,
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shm->pages);
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else
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rc = shm_get_kernel_pages(start, num_pages, shm->pages);
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if (rc > 0)
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shm->num_pages = rc;
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if (rc != num_pages) {
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if (rc >= 0)
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rc = -ENOMEM;
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ret = ERR_PTR(rc);
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goto err_put_shm_pages;
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}
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rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages,
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shm->num_pages, start);
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if (rc) {
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ret = ERR_PTR(rc);
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goto err_put_shm_pages;
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}
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return shm;
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err_put_shm_pages:
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if (flags & TEE_SHM_USER_MAPPED)
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unpin_user_pages(shm->pages, shm->num_pages);
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else
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shm_put_kernel_pages(shm->pages, shm->num_pages);
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kfree(shm->pages);
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err_free_shm:
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kfree(shm);
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err_ctx_put:
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teedev_ctx_put(ctx);
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err_dev_put:
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tee_device_put(teedev);
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return ret;
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}
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/**
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* tee_shm_register_user_buf() - Register a userspace shared memory buffer
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* @ctx: Context that registers the shared memory
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* @addr: The userspace address of the shared buffer
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* @length: Length of the shared buffer
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*
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* @returns a pointer to 'struct tee_shm'
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*/
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struct tee_shm *tee_shm_register_user_buf(struct tee_context *ctx,
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unsigned long addr, size_t length)
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{
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u32 flags = TEE_SHM_USER_MAPPED | TEE_SHM_DYNAMIC;
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struct tee_device *teedev = ctx->teedev;
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struct tee_shm *shm;
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void *ret;
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int id;
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if (!access_ok((void __user *)addr, length))
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return ERR_PTR(-EFAULT);
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mutex_lock(&teedev->mutex);
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id = idr_alloc(&teedev->idr, NULL, 1, 0, GFP_KERNEL);
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mutex_unlock(&teedev->mutex);
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if (id < 0)
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return ERR_PTR(id);
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shm = register_shm_helper(ctx, addr, length, flags, id);
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if (IS_ERR(shm)) {
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mutex_lock(&teedev->mutex);
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idr_remove(&teedev->idr, id);
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mutex_unlock(&teedev->mutex);
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return shm;
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}
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mutex_lock(&teedev->mutex);
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ret = idr_replace(&teedev->idr, shm, id);
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mutex_unlock(&teedev->mutex);
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if (IS_ERR(ret)) {
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tee_shm_free(shm);
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return ret;
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}
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return shm;
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}
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/**
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* tee_shm_register_kernel_buf() - Register kernel memory to be shared with
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* secure world
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* @ctx: Context that registers the shared memory
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* @addr: The buffer
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* @length: Length of the buffer
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*
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* @returns a pointer to 'struct tee_shm'
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*/
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struct tee_shm *tee_shm_register_kernel_buf(struct tee_context *ctx,
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void *addr, size_t length)
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{
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u32 flags = TEE_SHM_DYNAMIC;
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return register_shm_helper(ctx, (unsigned long)addr, length, flags, -1);
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}
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EXPORT_SYMBOL_GPL(tee_shm_register_kernel_buf);
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static int tee_shm_fop_release(struct inode *inode, struct file *filp)
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{
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tee_shm_put(filp->private_data);
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return 0;
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}
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static int tee_shm_fop_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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struct tee_shm *shm = filp->private_data;
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size_t size = vma->vm_end - vma->vm_start;
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/* Refuse sharing shared memory provided by application */
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if (shm->flags & TEE_SHM_USER_MAPPED)
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return -EINVAL;
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|
|
|
||
|
|
/* check for overflowing the buffer's size */
|
||
|
|
if (vma->vm_pgoff + vma_pages(vma) > shm->size >> PAGE_SHIFT)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT,
|
||
|
|
size, vma->vm_page_prot);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct file_operations tee_shm_fops = {
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.release = tee_shm_fop_release,
|
||
|
|
.mmap = tee_shm_fop_mmap,
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tee_shm_get_fd() - Increase reference count and return file descriptor
|
||
|
|
* @shm: Shared memory handle
|
||
|
|
* @returns user space file descriptor to shared memory
|
||
|
|
*/
|
||
|
|
int tee_shm_get_fd(struct tee_shm *shm)
|
||
|
|
{
|
||
|
|
int fd;
|
||
|
|
|
||
|
|
if (shm->id < 0)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
/* matched by tee_shm_put() in tee_shm_op_release() */
|
||
|
|
refcount_inc(&shm->refcount);
|
||
|
|
fd = anon_inode_getfd("tee_shm", &tee_shm_fops, shm, O_RDWR);
|
||
|
|
if (fd < 0)
|
||
|
|
tee_shm_put(shm);
|
||
|
|
return fd;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tee_shm_free() - Free shared memory
|
||
|
|
* @shm: Handle to shared memory to free
|
||
|
|
*/
|
||
|
|
void tee_shm_free(struct tee_shm *shm)
|
||
|
|
{
|
||
|
|
tee_shm_put(shm);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(tee_shm_free);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tee_shm_get_va() - Get virtual address of a shared memory plus an offset
|
||
|
|
* @shm: Shared memory handle
|
||
|
|
* @offs: Offset from start of this shared memory
|
||
|
|
* @returns virtual address of the shared memory + offs if offs is within
|
||
|
|
* the bounds of this shared memory, else an ERR_PTR
|
||
|
|
*/
|
||
|
|
void *tee_shm_get_va(struct tee_shm *shm, size_t offs)
|
||
|
|
{
|
||
|
|
if (!shm->kaddr)
|
||
|
|
return ERR_PTR(-EINVAL);
|
||
|
|
if (offs >= shm->size)
|
||
|
|
return ERR_PTR(-EINVAL);
|
||
|
|
return (char *)shm->kaddr + offs;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(tee_shm_get_va);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tee_shm_get_pa() - Get physical address of a shared memory plus an offset
|
||
|
|
* @shm: Shared memory handle
|
||
|
|
* @offs: Offset from start of this shared memory
|
||
|
|
* @pa: Physical address to return
|
||
|
|
* @returns 0 if offs is within the bounds of this shared memory, else an
|
||
|
|
* error code.
|
||
|
|
*/
|
||
|
|
int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa)
|
||
|
|
{
|
||
|
|
if (offs >= shm->size)
|
||
|
|
return -EINVAL;
|
||
|
|
if (pa)
|
||
|
|
*pa = shm->paddr + offs;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(tee_shm_get_pa);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tee_shm_get_from_id() - Find shared memory object and increase reference
|
||
|
|
* count
|
||
|
|
* @ctx: Context owning the shared memory
|
||
|
|
* @id: Id of shared memory object
|
||
|
|
* @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
|
||
|
|
*/
|
||
|
|
struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id)
|
||
|
|
{
|
||
|
|
struct tee_device *teedev;
|
||
|
|
struct tee_shm *shm;
|
||
|
|
|
||
|
|
if (!ctx)
|
||
|
|
return ERR_PTR(-EINVAL);
|
||
|
|
|
||
|
|
teedev = ctx->teedev;
|
||
|
|
mutex_lock(&teedev->mutex);
|
||
|
|
shm = idr_find(&teedev->idr, id);
|
||
|
|
/*
|
||
|
|
* If the tee_shm was found in the IDR it must have a refcount
|
||
|
|
* larger than 0 due to the guarantee in tee_shm_put() below. So
|
||
|
|
* it's safe to use refcount_inc().
|
||
|
|
*/
|
||
|
|
if (!shm || shm->ctx != ctx)
|
||
|
|
shm = ERR_PTR(-EINVAL);
|
||
|
|
else
|
||
|
|
refcount_inc(&shm->refcount);
|
||
|
|
mutex_unlock(&teedev->mutex);
|
||
|
|
return shm;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(tee_shm_get_from_id);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tee_shm_put() - Decrease reference count on a shared memory handle
|
||
|
|
* @shm: Shared memory handle
|
||
|
|
*/
|
||
|
|
void tee_shm_put(struct tee_shm *shm)
|
||
|
|
{
|
||
|
|
struct tee_device *teedev = shm->ctx->teedev;
|
||
|
|
bool do_release = false;
|
||
|
|
|
||
|
|
mutex_lock(&teedev->mutex);
|
||
|
|
if (refcount_dec_and_test(&shm->refcount)) {
|
||
|
|
/*
|
||
|
|
* refcount has reached 0, we must now remove it from the
|
||
|
|
* IDR before releasing the mutex. This will guarantee that
|
||
|
|
* the refcount_inc() in tee_shm_get_from_id() never starts
|
||
|
|
* from 0.
|
||
|
|
*/
|
||
|
|
if (shm->id >= 0)
|
||
|
|
idr_remove(&teedev->idr, shm->id);
|
||
|
|
do_release = true;
|
||
|
|
}
|
||
|
|
mutex_unlock(&teedev->mutex);
|
||
|
|
|
||
|
|
if (do_release)
|
||
|
|
tee_shm_release(teedev, shm);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(tee_shm_put);
|