mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-18 02:04:05 +08:00
78063a9dd9
This patch is a part of a series that extends kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. tee_shm_register()->optee_shm_unregister()->check_mem_type() uses provided user pointers for vma lookups (via __check_mem_type()), which can only by done with untagged pointers. Untag user pointers in this function. Link: http://lkml.kernel.org/r/4b993f33196b3566ac81285ff8453219e2079b45.1563904656.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Jens Wiklander <jens.wiklander@linaro.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Eric Auger <eric.auger@redhat.com> Cc: Felix Kuehling <Felix.Kuehling@amd.com> Cc: Khalid Aziz <khalid.aziz@oracle.com> Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
498 lines
12 KiB
C
498 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (c) 2015-2016, Linaro Limited
|
|
*/
|
|
#include <linux/device.h>
|
|
#include <linux/dma-buf.h>
|
|
#include <linux/fdtable.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/tee_drv.h>
|
|
#include "tee_private.h"
|
|
|
|
static void tee_shm_release(struct tee_shm *shm)
|
|
{
|
|
struct tee_device *teedev = shm->teedev;
|
|
|
|
mutex_lock(&teedev->mutex);
|
|
idr_remove(&teedev->idr, shm->id);
|
|
if (shm->ctx)
|
|
list_del(&shm->link);
|
|
mutex_unlock(&teedev->mutex);
|
|
|
|
if (shm->flags & TEE_SHM_POOL) {
|
|
struct tee_shm_pool_mgr *poolm;
|
|
|
|
if (shm->flags & TEE_SHM_DMA_BUF)
|
|
poolm = teedev->pool->dma_buf_mgr;
|
|
else
|
|
poolm = teedev->pool->private_mgr;
|
|
|
|
poolm->ops->free(poolm, shm);
|
|
} else if (shm->flags & TEE_SHM_REGISTER) {
|
|
size_t n;
|
|
int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
|
|
|
|
if (rc)
|
|
dev_err(teedev->dev.parent,
|
|
"unregister shm %p failed: %d", shm, rc);
|
|
|
|
for (n = 0; n < shm->num_pages; n++)
|
|
put_page(shm->pages[n]);
|
|
|
|
kfree(shm->pages);
|
|
}
|
|
|
|
if (shm->ctx)
|
|
teedev_ctx_put(shm->ctx);
|
|
|
|
kfree(shm);
|
|
|
|
tee_device_put(teedev);
|
|
}
|
|
|
|
static struct sg_table *tee_shm_op_map_dma_buf(struct dma_buf_attachment
|
|
*attach, enum dma_data_direction dir)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static void tee_shm_op_unmap_dma_buf(struct dma_buf_attachment *attach,
|
|
struct sg_table *table,
|
|
enum dma_data_direction dir)
|
|
{
|
|
}
|
|
|
|
static void tee_shm_op_release(struct dma_buf *dmabuf)
|
|
{
|
|
struct tee_shm *shm = dmabuf->priv;
|
|
|
|
tee_shm_release(shm);
|
|
}
|
|
|
|
static void *tee_shm_op_map(struct dma_buf *dmabuf, unsigned long pgnum)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static int tee_shm_op_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
|
|
{
|
|
struct tee_shm *shm = dmabuf->priv;
|
|
size_t size = vma->vm_end - vma->vm_start;
|
|
|
|
/* Refuse sharing shared memory provided by application */
|
|
if (shm->flags & TEE_SHM_REGISTER)
|
|
return -EINVAL;
|
|
|
|
return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT,
|
|
size, vma->vm_page_prot);
|
|
}
|
|
|
|
static const struct dma_buf_ops tee_shm_dma_buf_ops = {
|
|
.map_dma_buf = tee_shm_op_map_dma_buf,
|
|
.unmap_dma_buf = tee_shm_op_unmap_dma_buf,
|
|
.release = tee_shm_op_release,
|
|
.map = tee_shm_op_map,
|
|
.mmap = tee_shm_op_mmap,
|
|
};
|
|
|
|
static struct tee_shm *__tee_shm_alloc(struct tee_context *ctx,
|
|
struct tee_device *teedev,
|
|
size_t size, u32 flags)
|
|
{
|
|
struct tee_shm_pool_mgr *poolm = NULL;
|
|
struct tee_shm *shm;
|
|
void *ret;
|
|
int rc;
|
|
|
|
if (ctx && ctx->teedev != teedev) {
|
|
dev_err(teedev->dev.parent, "ctx and teedev mismatch\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
if (!(flags & TEE_SHM_MAPPED)) {
|
|
dev_err(teedev->dev.parent,
|
|
"only mapped allocations supported\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
if ((flags & ~(TEE_SHM_MAPPED | TEE_SHM_DMA_BUF))) {
|
|
dev_err(teedev->dev.parent, "invalid shm flags 0x%x", flags);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
if (!tee_device_get(teedev))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (!teedev->pool) {
|
|
/* teedev has been detached from driver */
|
|
ret = ERR_PTR(-EINVAL);
|
|
goto err_dev_put;
|
|
}
|
|
|
|
shm = kzalloc(sizeof(*shm), GFP_KERNEL);
|
|
if (!shm) {
|
|
ret = ERR_PTR(-ENOMEM);
|
|
goto err_dev_put;
|
|
}
|
|
|
|
shm->flags = flags | TEE_SHM_POOL;
|
|
shm->teedev = teedev;
|
|
shm->ctx = ctx;
|
|
if (flags & TEE_SHM_DMA_BUF)
|
|
poolm = teedev->pool->dma_buf_mgr;
|
|
else
|
|
poolm = teedev->pool->private_mgr;
|
|
|
|
rc = poolm->ops->alloc(poolm, shm, size);
|
|
if (rc) {
|
|
ret = ERR_PTR(rc);
|
|
goto err_kfree;
|
|
}
|
|
|
|
mutex_lock(&teedev->mutex);
|
|
shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
|
|
mutex_unlock(&teedev->mutex);
|
|
if (shm->id < 0) {
|
|
ret = ERR_PTR(shm->id);
|
|
goto err_pool_free;
|
|
}
|
|
|
|
if (flags & TEE_SHM_DMA_BUF) {
|
|
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
|
|
|
|
exp_info.ops = &tee_shm_dma_buf_ops;
|
|
exp_info.size = shm->size;
|
|
exp_info.flags = O_RDWR;
|
|
exp_info.priv = shm;
|
|
|
|
shm->dmabuf = dma_buf_export(&exp_info);
|
|
if (IS_ERR(shm->dmabuf)) {
|
|
ret = ERR_CAST(shm->dmabuf);
|
|
goto err_rem;
|
|
}
|
|
}
|
|
|
|
if (ctx) {
|
|
teedev_ctx_get(ctx);
|
|
mutex_lock(&teedev->mutex);
|
|
list_add_tail(&shm->link, &ctx->list_shm);
|
|
mutex_unlock(&teedev->mutex);
|
|
}
|
|
|
|
return shm;
|
|
err_rem:
|
|
mutex_lock(&teedev->mutex);
|
|
idr_remove(&teedev->idr, shm->id);
|
|
mutex_unlock(&teedev->mutex);
|
|
err_pool_free:
|
|
poolm->ops->free(poolm, shm);
|
|
err_kfree:
|
|
kfree(shm);
|
|
err_dev_put:
|
|
tee_device_put(teedev);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* tee_shm_alloc() - Allocate shared memory
|
|
* @ctx: Context that allocates the shared memory
|
|
* @size: Requested size of shared memory
|
|
* @flags: Flags setting properties for the requested shared memory.
|
|
*
|
|
* Memory allocated as global shared memory is automatically freed when the
|
|
* TEE file pointer is closed. The @flags field uses the bits defined by
|
|
* TEE_SHM_* in <linux/tee_drv.h>. TEE_SHM_MAPPED must currently always be
|
|
* set. If TEE_SHM_DMA_BUF global shared memory will be allocated and
|
|
* associated with a dma-buf handle, else driver private memory.
|
|
*/
|
|
struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags)
|
|
{
|
|
return __tee_shm_alloc(ctx, ctx->teedev, size, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_shm_alloc);
|
|
|
|
struct tee_shm *tee_shm_priv_alloc(struct tee_device *teedev, size_t size)
|
|
{
|
|
return __tee_shm_alloc(NULL, teedev, size, TEE_SHM_MAPPED);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_shm_priv_alloc);
|
|
|
|
struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
|
|
size_t length, u32 flags)
|
|
{
|
|
struct tee_device *teedev = ctx->teedev;
|
|
const u32 req_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED;
|
|
struct tee_shm *shm;
|
|
void *ret;
|
|
int rc;
|
|
int num_pages;
|
|
unsigned long start;
|
|
|
|
if (flags != req_flags)
|
|
return ERR_PTR(-ENOTSUPP);
|
|
|
|
if (!tee_device_get(teedev))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (!teedev->desc->ops->shm_register ||
|
|
!teedev->desc->ops->shm_unregister) {
|
|
tee_device_put(teedev);
|
|
return ERR_PTR(-ENOTSUPP);
|
|
}
|
|
|
|
teedev_ctx_get(ctx);
|
|
|
|
shm = kzalloc(sizeof(*shm), GFP_KERNEL);
|
|
if (!shm) {
|
|
ret = ERR_PTR(-ENOMEM);
|
|
goto err;
|
|
}
|
|
|
|
shm->flags = flags | TEE_SHM_REGISTER;
|
|
shm->teedev = teedev;
|
|
shm->ctx = ctx;
|
|
shm->id = -1;
|
|
addr = untagged_addr(addr);
|
|
start = rounddown(addr, PAGE_SIZE);
|
|
shm->offset = addr - start;
|
|
shm->size = length;
|
|
num_pages = (roundup(addr + length, PAGE_SIZE) - start) / PAGE_SIZE;
|
|
shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL);
|
|
if (!shm->pages) {
|
|
ret = ERR_PTR(-ENOMEM);
|
|
goto err;
|
|
}
|
|
|
|
rc = get_user_pages_fast(start, num_pages, FOLL_WRITE, shm->pages);
|
|
if (rc > 0)
|
|
shm->num_pages = rc;
|
|
if (rc != num_pages) {
|
|
if (rc >= 0)
|
|
rc = -ENOMEM;
|
|
ret = ERR_PTR(rc);
|
|
goto err;
|
|
}
|
|
|
|
mutex_lock(&teedev->mutex);
|
|
shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
|
|
mutex_unlock(&teedev->mutex);
|
|
|
|
if (shm->id < 0) {
|
|
ret = ERR_PTR(shm->id);
|
|
goto err;
|
|
}
|
|
|
|
rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages,
|
|
shm->num_pages, start);
|
|
if (rc) {
|
|
ret = ERR_PTR(rc);
|
|
goto err;
|
|
}
|
|
|
|
if (flags & TEE_SHM_DMA_BUF) {
|
|
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
|
|
|
|
exp_info.ops = &tee_shm_dma_buf_ops;
|
|
exp_info.size = shm->size;
|
|
exp_info.flags = O_RDWR;
|
|
exp_info.priv = shm;
|
|
|
|
shm->dmabuf = dma_buf_export(&exp_info);
|
|
if (IS_ERR(shm->dmabuf)) {
|
|
ret = ERR_CAST(shm->dmabuf);
|
|
teedev->desc->ops->shm_unregister(ctx, shm);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
mutex_lock(&teedev->mutex);
|
|
list_add_tail(&shm->link, &ctx->list_shm);
|
|
mutex_unlock(&teedev->mutex);
|
|
|
|
return shm;
|
|
err:
|
|
if (shm) {
|
|
size_t n;
|
|
|
|
if (shm->id >= 0) {
|
|
mutex_lock(&teedev->mutex);
|
|
idr_remove(&teedev->idr, shm->id);
|
|
mutex_unlock(&teedev->mutex);
|
|
}
|
|
if (shm->pages) {
|
|
for (n = 0; n < shm->num_pages; n++)
|
|
put_page(shm->pages[n]);
|
|
kfree(shm->pages);
|
|
}
|
|
}
|
|
kfree(shm);
|
|
teedev_ctx_put(ctx);
|
|
tee_device_put(teedev);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_shm_register);
|
|
|
|
/**
|
|
* 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->flags & TEE_SHM_DMA_BUF))
|
|
return -EINVAL;
|
|
|
|
get_dma_buf(shm->dmabuf);
|
|
fd = dma_buf_fd(shm->dmabuf, O_CLOEXEC);
|
|
if (fd < 0)
|
|
dma_buf_put(shm->dmabuf);
|
|
return fd;
|
|
}
|
|
|
|
/**
|
|
* tee_shm_free() - Free shared memory
|
|
* @shm: Handle to shared memory to free
|
|
*/
|
|
void tee_shm_free(struct tee_shm *shm)
|
|
{
|
|
/*
|
|
* dma_buf_put() decreases the dmabuf reference counter and will
|
|
* call tee_shm_release() when the last reference is gone.
|
|
*
|
|
* In the case of driver private memory we call tee_shm_release
|
|
* directly instead as it doesn't have a reference counter.
|
|
*/
|
|
if (shm->flags & TEE_SHM_DMA_BUF)
|
|
dma_buf_put(shm->dmabuf);
|
|
else
|
|
tee_shm_release(shm);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_shm_free);
|
|
|
|
/**
|
|
* tee_shm_va2pa() - Get physical address of a virtual address
|
|
* @shm: Shared memory handle
|
|
* @va: Virtual address to tranlsate
|
|
* @pa: Returned physical address
|
|
* @returns 0 on success and < 0 on failure
|
|
*/
|
|
int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa)
|
|
{
|
|
if (!(shm->flags & TEE_SHM_MAPPED))
|
|
return -EINVAL;
|
|
/* Check that we're in the range of the shm */
|
|
if ((char *)va < (char *)shm->kaddr)
|
|
return -EINVAL;
|
|
if ((char *)va >= ((char *)shm->kaddr + shm->size))
|
|
return -EINVAL;
|
|
|
|
return tee_shm_get_pa(
|
|
shm, (unsigned long)va - (unsigned long)shm->kaddr, pa);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_shm_va2pa);
|
|
|
|
/**
|
|
* tee_shm_pa2va() - Get virtual address of a physical address
|
|
* @shm: Shared memory handle
|
|
* @pa: Physical address to tranlsate
|
|
* @va: Returned virtual address
|
|
* @returns 0 on success and < 0 on failure
|
|
*/
|
|
int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va)
|
|
{
|
|
if (!(shm->flags & TEE_SHM_MAPPED))
|
|
return -EINVAL;
|
|
/* Check that we're in the range of the shm */
|
|
if (pa < shm->paddr)
|
|
return -EINVAL;
|
|
if (pa >= (shm->paddr + shm->size))
|
|
return -EINVAL;
|
|
|
|
if (va) {
|
|
void *v = tee_shm_get_va(shm, pa - shm->paddr);
|
|
|
|
if (IS_ERR(v))
|
|
return PTR_ERR(v);
|
|
*va = v;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_shm_pa2va);
|
|
|
|
/**
|
|
* 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->flags & TEE_SHM_MAPPED))
|
|
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 (!shm || shm->ctx != ctx)
|
|
shm = ERR_PTR(-EINVAL);
|
|
else if (shm->flags & TEE_SHM_DMA_BUF)
|
|
get_dma_buf(shm->dmabuf);
|
|
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)
|
|
{
|
|
if (shm->flags & TEE_SHM_DMA_BUF)
|
|
dma_buf_put(shm->dmabuf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_shm_put);
|