forked from Minki/linux
d0b2c5334f
... not only when the dma-buf is freshly created. In contrived examples someone else could have exported/imported the dma-buf already and handed us the gem object with a flink name. If such on object gets reexported as a dma_buf we won't have it in the handle cache already, which breaks the guarantee that for dma-buf imports we always hand back an existing handle if there is one. This is exercised by igt/prime_self_import/with_one_bo_two_files Now if we extend the locked sections just a notch more we can also plug th racy buf/handle cache setup in handle_to_fd: If evil userspace races a concurrent gem close against a prime export operation we can end up tearing down the gem handle before the dma buf handle cache is set up. When handle_to_fd gets around to adding the handle to the cache there will be no one left to clean it up, effectily leaking the bo (and the dma-buf, since the handle cache holds a ref on the dma-buf): Thread A Thread B handle_to_fd: lookup gem object from handle creates new dma_buf gem_close on the same handle obj->dma_buf is set, but file priv buf handle cache has no entry obj->handle_count drops to 0 drm_prime_add_buf_handle sets up the handle cache -> We have a dma-buf reference in the handle cache, but since the handle_count of the gem object already dropped to 0 no on will clean it up. When closing the drm device fd we'll hit the WARN_ON in drm_prime_destroy_file_private. The important change is to extend the critical section of the filp->prime.lock to cover the gem handle lookup. This serializes with a concurrent gem handle close. This leak is exercised by igt/prime_self_import/export-vs-gem_close-race Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Dave Airlie <airlied@redhat.com>
695 lines
18 KiB
C
695 lines
18 KiB
C
/*
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* Copyright © 2012 Red Hat
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Dave Airlie <airlied@redhat.com>
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* Rob Clark <rob.clark@linaro.org>
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*
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*/
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#include <linux/export.h>
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#include <linux/dma-buf.h>
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#include <drm/drmP.h>
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/*
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* DMA-BUF/GEM Object references and lifetime overview:
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*
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* On the export the dma_buf holds a reference to the exporting GEM
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* object. It takes this reference in handle_to_fd_ioctl, when it
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* first calls .prime_export and stores the exporting GEM object in
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* the dma_buf priv. This reference is released when the dma_buf
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* object goes away in the driver .release function.
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*
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* On the import the importing GEM object holds a reference to the
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* dma_buf (which in turn holds a ref to the exporting GEM object).
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* It takes that reference in the fd_to_handle ioctl.
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* It calls dma_buf_get, creates an attachment to it and stores the
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* attachment in the GEM object. When this attachment is destroyed
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* when the imported object is destroyed, we remove the attachment
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* and drop the reference to the dma_buf.
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*
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* Thus the chain of references always flows in one direction
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* (avoiding loops): importing_gem -> dmabuf -> exporting_gem
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*
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* Self-importing: if userspace is using PRIME as a replacement for flink
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* then it will get a fd->handle request for a GEM object that it created.
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* Drivers should detect this situation and return back the gem object
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* from the dma-buf private. Prime will do this automatically for drivers that
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* use the drm_gem_prime_{import,export} helpers.
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*/
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struct drm_prime_member {
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struct list_head entry;
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struct dma_buf *dma_buf;
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uint32_t handle;
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};
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struct drm_prime_attachment {
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struct sg_table *sgt;
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enum dma_data_direction dir;
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};
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static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t handle)
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{
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struct drm_prime_member *member;
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member = kmalloc(sizeof(*member), GFP_KERNEL);
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if (!member)
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return -ENOMEM;
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get_dma_buf(dma_buf);
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member->dma_buf = dma_buf;
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member->handle = handle;
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list_add(&member->entry, &prime_fpriv->head);
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return 0;
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}
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static struct dma_buf *drm_prime_lookup_buf_by_handle(struct drm_prime_file_private *prime_fpriv,
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uint32_t handle)
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{
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struct drm_prime_member *member;
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list_for_each_entry(member, &prime_fpriv->head, entry) {
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if (member->handle == handle)
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return member->dma_buf;
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}
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return NULL;
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}
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static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpriv,
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struct dma_buf *dma_buf,
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uint32_t *handle)
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{
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struct drm_prime_member *member;
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list_for_each_entry(member, &prime_fpriv->head, entry) {
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if (member->dma_buf == dma_buf) {
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*handle = member->handle;
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return 0;
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}
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}
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return -ENOENT;
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}
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static int drm_gem_map_attach(struct dma_buf *dma_buf,
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struct device *target_dev,
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struct dma_buf_attachment *attach)
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{
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struct drm_prime_attachment *prime_attach;
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struct drm_gem_object *obj = dma_buf->priv;
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struct drm_device *dev = obj->dev;
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prime_attach = kzalloc(sizeof(*prime_attach), GFP_KERNEL);
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if (!prime_attach)
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return -ENOMEM;
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prime_attach->dir = DMA_NONE;
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attach->priv = prime_attach;
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if (!dev->driver->gem_prime_pin)
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return 0;
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return dev->driver->gem_prime_pin(obj);
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}
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static void drm_gem_map_detach(struct dma_buf *dma_buf,
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struct dma_buf_attachment *attach)
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{
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struct drm_prime_attachment *prime_attach = attach->priv;
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struct drm_gem_object *obj = dma_buf->priv;
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struct drm_device *dev = obj->dev;
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struct sg_table *sgt;
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if (dev->driver->gem_prime_unpin)
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dev->driver->gem_prime_unpin(obj);
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if (!prime_attach)
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return;
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sgt = prime_attach->sgt;
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if (sgt) {
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if (prime_attach->dir != DMA_NONE)
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dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents,
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prime_attach->dir);
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sg_free_table(sgt);
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}
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kfree(sgt);
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kfree(prime_attach);
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attach->priv = NULL;
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}
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void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv,
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struct dma_buf *dma_buf)
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{
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struct drm_prime_member *member, *safe;
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list_for_each_entry_safe(member, safe, &prime_fpriv->head, entry) {
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if (member->dma_buf == dma_buf) {
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dma_buf_put(dma_buf);
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list_del(&member->entry);
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kfree(member);
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}
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}
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}
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static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
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enum dma_data_direction dir)
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{
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struct drm_prime_attachment *prime_attach = attach->priv;
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struct drm_gem_object *obj = attach->dmabuf->priv;
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struct sg_table *sgt;
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if (WARN_ON(dir == DMA_NONE || !prime_attach))
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return ERR_PTR(-EINVAL);
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/* return the cached mapping when possible */
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if (prime_attach->dir == dir)
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return prime_attach->sgt;
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/*
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* two mappings with different directions for the same attachment are
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* not allowed
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*/
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if (WARN_ON(prime_attach->dir != DMA_NONE))
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return ERR_PTR(-EBUSY);
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sgt = obj->dev->driver->gem_prime_get_sg_table(obj);
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if (!IS_ERR(sgt)) {
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if (!dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir)) {
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sg_free_table(sgt);
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kfree(sgt);
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sgt = ERR_PTR(-ENOMEM);
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} else {
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prime_attach->sgt = sgt;
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prime_attach->dir = dir;
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}
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}
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return sgt;
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}
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static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
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struct sg_table *sgt, enum dma_data_direction dir)
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{
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/* nothing to be done here */
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}
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void drm_gem_dmabuf_release(struct dma_buf *dma_buf)
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{
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struct drm_gem_object *obj = dma_buf->priv;
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/* drop the reference on the export fd holds */
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drm_gem_object_unreference_unlocked(obj);
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}
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EXPORT_SYMBOL(drm_gem_dmabuf_release);
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static void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf)
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{
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struct drm_gem_object *obj = dma_buf->priv;
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struct drm_device *dev = obj->dev;
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return dev->driver->gem_prime_vmap(obj);
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}
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static void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
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{
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struct drm_gem_object *obj = dma_buf->priv;
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struct drm_device *dev = obj->dev;
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dev->driver->gem_prime_vunmap(obj, vaddr);
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}
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static void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
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unsigned long page_num)
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{
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return NULL;
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}
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static void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
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unsigned long page_num, void *addr)
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{
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}
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static void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf,
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unsigned long page_num)
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{
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return NULL;
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}
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static void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf,
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unsigned long page_num, void *addr)
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{
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}
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static int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf,
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struct vm_area_struct *vma)
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{
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struct drm_gem_object *obj = dma_buf->priv;
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struct drm_device *dev = obj->dev;
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if (!dev->driver->gem_prime_mmap)
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return -ENOSYS;
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return dev->driver->gem_prime_mmap(obj, vma);
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}
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static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = {
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.attach = drm_gem_map_attach,
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.detach = drm_gem_map_detach,
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.map_dma_buf = drm_gem_map_dma_buf,
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.unmap_dma_buf = drm_gem_unmap_dma_buf,
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.release = drm_gem_dmabuf_release,
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.kmap = drm_gem_dmabuf_kmap,
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.kmap_atomic = drm_gem_dmabuf_kmap_atomic,
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.kunmap = drm_gem_dmabuf_kunmap,
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.kunmap_atomic = drm_gem_dmabuf_kunmap_atomic,
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.mmap = drm_gem_dmabuf_mmap,
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.vmap = drm_gem_dmabuf_vmap,
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.vunmap = drm_gem_dmabuf_vunmap,
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};
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/**
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* DOC: PRIME Helpers
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*
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* Drivers can implement @gem_prime_export and @gem_prime_import in terms of
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* simpler APIs by using the helper functions @drm_gem_prime_export and
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* @drm_gem_prime_import. These functions implement dma-buf support in terms of
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* five lower-level driver callbacks:
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*
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* Export callbacks:
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*
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* - @gem_prime_pin (optional): prepare a GEM object for exporting
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*
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* - @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages
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*
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* - @gem_prime_vmap: vmap a buffer exported by your driver
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*
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* - @gem_prime_vunmap: vunmap a buffer exported by your driver
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*
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* Import callback:
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*
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* - @gem_prime_import_sg_table (import): produce a GEM object from another
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* driver's scatter/gather table
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*/
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struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
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struct drm_gem_object *obj, int flags)
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{
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return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size, flags);
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}
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EXPORT_SYMBOL(drm_gem_prime_export);
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static struct dma_buf *export_and_register_object(struct drm_device *dev,
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struct drm_gem_object *obj,
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uint32_t flags)
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{
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struct dma_buf *dmabuf;
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/* prevent races with concurrent gem_close. */
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if (obj->handle_count == 0) {
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dmabuf = ERR_PTR(-ENOENT);
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return dmabuf;
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}
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dmabuf = dev->driver->gem_prime_export(dev, obj, flags);
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if (IS_ERR(dmabuf)) {
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/* normally the created dma-buf takes ownership of the ref,
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* but if that fails then drop the ref
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*/
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return dmabuf;
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}
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/*
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* Note that callers do not need to clean up the export cache
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* since the check for obj->handle_count guarantees that someone
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* will clean it up.
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*/
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obj->dma_buf = dmabuf;
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get_dma_buf(obj->dma_buf);
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/* Grab a new ref since the callers is now used by the dma-buf */
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drm_gem_object_reference(obj);
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return dmabuf;
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}
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int drm_gem_prime_handle_to_fd(struct drm_device *dev,
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struct drm_file *file_priv, uint32_t handle, uint32_t flags,
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int *prime_fd)
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{
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struct drm_gem_object *obj;
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int ret = 0;
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struct dma_buf *dmabuf;
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mutex_lock(&file_priv->prime.lock);
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obj = drm_gem_object_lookup(dev, file_priv, handle);
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if (!obj) {
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ret = -ENOENT;
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goto out_unlock;
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}
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dmabuf = drm_prime_lookup_buf_by_handle(&file_priv->prime, handle);
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if (dmabuf) {
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get_dma_buf(dmabuf);
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goto out_have_handle;
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}
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mutex_lock(&dev->object_name_lock);
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/* re-export the original imported object */
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if (obj->import_attach) {
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dmabuf = obj->import_attach->dmabuf;
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get_dma_buf(dmabuf);
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goto out_have_obj;
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}
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if (obj->dma_buf) {
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get_dma_buf(obj->dma_buf);
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dmabuf = obj->dma_buf;
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goto out_have_obj;
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}
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dmabuf = export_and_register_object(dev, obj, flags);
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if (IS_ERR(dmabuf)) {
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/* normally the created dma-buf takes ownership of the ref,
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* but if that fails then drop the ref
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*/
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ret = PTR_ERR(dmabuf);
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mutex_unlock(&dev->object_name_lock);
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goto out;
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}
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out_have_obj:
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/*
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* If we've exported this buffer then cheat and add it to the import list
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* so we get the correct handle back. We must do this under the
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* protection of dev->object_name_lock to ensure that a racing gem close
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* ioctl doesn't miss to remove this buffer handle from the cache.
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*/
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ret = drm_prime_add_buf_handle(&file_priv->prime,
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dmabuf, handle);
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mutex_unlock(&dev->object_name_lock);
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if (ret)
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goto fail_put_dmabuf;
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out_have_handle:
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ret = dma_buf_fd(dmabuf, flags);
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/*
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* We must _not_ remove the buffer from the handle cache since the newly
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* created dma buf is already linked in the global obj->dma_buf pointer,
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* and that is invariant as long as a userspace gem handle exists.
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* Closing the handle will clean out the cache anyway, so we don't leak.
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*/
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if (ret < 0) {
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goto fail_put_dmabuf;
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} else {
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*prime_fd = ret;
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ret = 0;
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}
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goto out;
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fail_put_dmabuf:
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dma_buf_put(dmabuf);
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out:
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drm_gem_object_unreference_unlocked(obj);
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out_unlock:
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mutex_unlock(&file_priv->prime.lock);
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return ret;
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}
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EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
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struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
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struct dma_buf *dma_buf)
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{
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struct dma_buf_attachment *attach;
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struct sg_table *sgt;
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struct drm_gem_object *obj;
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int ret;
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|
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if (!dev->driver->gem_prime_import_sg_table)
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return ERR_PTR(-EINVAL);
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|
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if (dma_buf->ops == &drm_gem_prime_dmabuf_ops) {
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obj = dma_buf->priv;
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if (obj->dev == dev) {
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/*
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* Importing dmabuf exported from out own gem increases
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* refcount on gem itself instead of f_count of dmabuf.
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*/
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drm_gem_object_reference(obj);
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return obj;
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}
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}
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|
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attach = dma_buf_attach(dma_buf, dev->dev);
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if (IS_ERR(attach))
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return ERR_CAST(attach);
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|
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get_dma_buf(dma_buf);
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sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
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if (IS_ERR_OR_NULL(sgt)) {
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ret = PTR_ERR(sgt);
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goto fail_detach;
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}
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obj = dev->driver->gem_prime_import_sg_table(dev, dma_buf->size, sgt);
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if (IS_ERR(obj)) {
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ret = PTR_ERR(obj);
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goto fail_unmap;
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}
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|
|
obj->import_attach = attach;
|
|
|
|
return obj;
|
|
|
|
fail_unmap:
|
|
dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
|
|
fail_detach:
|
|
dma_buf_detach(dma_buf, attach);
|
|
dma_buf_put(dma_buf);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_prime_import);
|
|
|
|
int drm_gem_prime_fd_to_handle(struct drm_device *dev,
|
|
struct drm_file *file_priv, int prime_fd, uint32_t *handle)
|
|
{
|
|
struct dma_buf *dma_buf;
|
|
struct drm_gem_object *obj;
|
|
int ret;
|
|
|
|
dma_buf = dma_buf_get(prime_fd);
|
|
if (IS_ERR(dma_buf))
|
|
return PTR_ERR(dma_buf);
|
|
|
|
mutex_lock(&file_priv->prime.lock);
|
|
|
|
ret = drm_prime_lookup_buf_handle(&file_priv->prime,
|
|
dma_buf, handle);
|
|
if (ret == 0)
|
|
goto out_put;
|
|
|
|
/* never seen this one, need to import */
|
|
mutex_lock(&dev->object_name_lock);
|
|
obj = dev->driver->gem_prime_import(dev, dma_buf);
|
|
if (IS_ERR(obj)) {
|
|
ret = PTR_ERR(obj);
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (obj->dma_buf) {
|
|
WARN_ON(obj->dma_buf != dma_buf);
|
|
} else {
|
|
obj->dma_buf = dma_buf;
|
|
get_dma_buf(dma_buf);
|
|
}
|
|
|
|
/* drm_gem_handle_create_tail unlocks dev->object_name_lock. */
|
|
ret = drm_gem_handle_create_tail(file_priv, obj, handle);
|
|
drm_gem_object_unreference_unlocked(obj);
|
|
if (ret)
|
|
goto out_put;
|
|
|
|
ret = drm_prime_add_buf_handle(&file_priv->prime,
|
|
dma_buf, *handle);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
mutex_unlock(&file_priv->prime.lock);
|
|
|
|
dma_buf_put(dma_buf);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
/* hmm, if driver attached, we are relying on the free-object path
|
|
* to detach.. which seems ok..
|
|
*/
|
|
drm_gem_handle_delete(file_priv, *handle);
|
|
out_unlock:
|
|
mutex_lock(&dev->object_name_lock);
|
|
out_put:
|
|
dma_buf_put(dma_buf);
|
|
mutex_unlock(&file_priv->prime.lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_prime_fd_to_handle);
|
|
|
|
int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_prime_handle *args = data;
|
|
uint32_t flags;
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_PRIME))
|
|
return -EINVAL;
|
|
|
|
if (!dev->driver->prime_handle_to_fd)
|
|
return -ENOSYS;
|
|
|
|
/* check flags are valid */
|
|
if (args->flags & ~DRM_CLOEXEC)
|
|
return -EINVAL;
|
|
|
|
/* we only want to pass DRM_CLOEXEC which is == O_CLOEXEC */
|
|
flags = args->flags & DRM_CLOEXEC;
|
|
|
|
return dev->driver->prime_handle_to_fd(dev, file_priv,
|
|
args->handle, flags, &args->fd);
|
|
}
|
|
|
|
int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data,
|
|
struct drm_file *file_priv)
|
|
{
|
|
struct drm_prime_handle *args = data;
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_PRIME))
|
|
return -EINVAL;
|
|
|
|
if (!dev->driver->prime_fd_to_handle)
|
|
return -ENOSYS;
|
|
|
|
return dev->driver->prime_fd_to_handle(dev, file_priv,
|
|
args->fd, &args->handle);
|
|
}
|
|
|
|
/*
|
|
* drm_prime_pages_to_sg
|
|
*
|
|
* this helper creates an sg table object from a set of pages
|
|
* the driver is responsible for mapping the pages into the
|
|
* importers address space
|
|
*/
|
|
struct sg_table *drm_prime_pages_to_sg(struct page **pages, int nr_pages)
|
|
{
|
|
struct sg_table *sg = NULL;
|
|
int ret;
|
|
|
|
sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
|
|
if (!sg) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ret = sg_alloc_table_from_pages(sg, pages, nr_pages, 0,
|
|
nr_pages << PAGE_SHIFT, GFP_KERNEL);
|
|
if (ret)
|
|
goto out;
|
|
|
|
return sg;
|
|
out:
|
|
kfree(sg);
|
|
return ERR_PTR(ret);
|
|
}
|
|
EXPORT_SYMBOL(drm_prime_pages_to_sg);
|
|
|
|
/* export an sg table into an array of pages and addresses
|
|
this is currently required by the TTM driver in order to do correct fault
|
|
handling */
|
|
int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
|
|
dma_addr_t *addrs, int max_pages)
|
|
{
|
|
unsigned count;
|
|
struct scatterlist *sg;
|
|
struct page *page;
|
|
u32 len, offset;
|
|
int pg_index;
|
|
dma_addr_t addr;
|
|
|
|
pg_index = 0;
|
|
for_each_sg(sgt->sgl, sg, sgt->nents, count) {
|
|
len = sg->length;
|
|
offset = sg->offset;
|
|
page = sg_page(sg);
|
|
addr = sg_dma_address(sg);
|
|
|
|
while (len > 0) {
|
|
if (WARN_ON(pg_index >= max_pages))
|
|
return -1;
|
|
pages[pg_index] = page;
|
|
if (addrs)
|
|
addrs[pg_index] = addr;
|
|
|
|
page++;
|
|
addr += PAGE_SIZE;
|
|
len -= PAGE_SIZE;
|
|
pg_index++;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays);
|
|
/* helper function to cleanup a GEM/prime object */
|
|
void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg)
|
|
{
|
|
struct dma_buf_attachment *attach;
|
|
struct dma_buf *dma_buf;
|
|
attach = obj->import_attach;
|
|
if (sg)
|
|
dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
|
|
dma_buf = attach->dmabuf;
|
|
dma_buf_detach(attach->dmabuf, attach);
|
|
/* remove the reference */
|
|
dma_buf_put(dma_buf);
|
|
}
|
|
EXPORT_SYMBOL(drm_prime_gem_destroy);
|
|
|
|
void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv)
|
|
{
|
|
INIT_LIST_HEAD(&prime_fpriv->head);
|
|
mutex_init(&prime_fpriv->lock);
|
|
}
|
|
EXPORT_SYMBOL(drm_prime_init_file_private);
|
|
|
|
void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv)
|
|
{
|
|
/* by now drm_gem_release should've made sure the list is empty */
|
|
WARN_ON(!list_empty(&prime_fpriv->head));
|
|
}
|
|
EXPORT_SYMBOL(drm_prime_destroy_file_private);
|