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drm/ttm, drm/vmwgfx: Relax permission checking when opening surfaces

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Previously, when a surface was opened using a legacy (non prime) handle,
it was verified to have been created by a client in the same master realm.
Relax this so that opening is also allowed recursively if the client
already has the surface open.

This works around a regression in svga mesa where opening of a shared
surface is used recursively to obtain surface information.

Cc: <stable@vger.kernel.org>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
This commit is contained in:
Thomas Hellstrom 2017-03-27 11:21:25 +02:00
parent 63774069d9
commit fe25deb773
5 changed files with 24 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/gpu/drm/ttm/ttm_object.c
View File

@ -179,7 +179,7 @@ int ttm_base_object_init(struct ttm_object_file *tfile,
if (unlikely(ret != 0))
goto out_err0;
ret = ttm_ref_object_add(tfile, base, TTM_REF_USAGE, NULL);
ret = ttm_ref_object_add(tfile, base, TTM_REF_USAGE, NULL, false);
if (unlikely(ret != 0))
goto out_err1;
@ -318,7 +318,8 @@ EXPORT_SYMBOL(ttm_ref_object_exists);
int ttm_ref_object_add(struct ttm_object_file *tfile,
struct ttm_base_object *base,
enum ttm_ref_type ref_type, bool *existed)
enum ttm_ref_type ref_type, bool *existed,
bool require_existed)
{
struct drm_open_hash *ht = &tfile->ref_hash[ref_type];
struct ttm_ref_object *ref;
@ -345,6 +346,9 @@ int ttm_ref_object_add(struct ttm_object_file *tfile,
}
rcu_read_unlock();
if (require_existed)
return -EPERM;
ret = ttm_mem_global_alloc(mem_glob, sizeof(*ref),
false, false);
if (unlikely(ret != 0))
@ -635,7 +639,7 @@ int ttm_prime_fd_to_handle(struct ttm_object_file *tfile,
prime = (struct ttm_prime_object *) dma_buf->priv;
base = &prime->base;
*handle = base->hash.key;
ret = ttm_ref_object_add(tfile, base, TTM_REF_USAGE, NULL);
ret = ttm_ref_object_add(tfile, base, TTM_REF_USAGE, NULL, false);
dma_buf_put(dma_buf);

6
drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
View File

@ -1075,10 +1075,8 @@ int vmw_fence_event_ioctl(struct drm_device *dev, void *data,
(void) vmw_fence_obj_reference(fence);
if (user_fence_rep != NULL) {
bool existed;
ret = ttm_ref_object_add(tfile, base,
TTM_REF_USAGE, &existed);
ret = ttm_ref_object_add(vmw_fp->tfile, base,
TTM_REF_USAGE, NULL, false);
if (unlikely(ret != 0)) {
DRM_ERROR("Failed to reference a fence "
"object.\n");

4
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
View File

@ -589,7 +589,7 @@ static int vmw_user_dmabuf_synccpu_grab(struct vmw_user_dma_buffer *user_bo,
return ret;
ret = ttm_ref_object_add(tfile, &user_bo->prime.base,
TTM_REF_SYNCCPU_WRITE, &existed);
TTM_REF_SYNCCPU_WRITE, &existed, false);
if (ret != 0 || existed)
ttm_bo_synccpu_write_release(&user_bo->dma.base);
@ -773,7 +773,7 @@ int vmw_user_dmabuf_reference(struct ttm_object_file *tfile,
*handle = user_bo->prime.base.hash.key;
return ttm_ref_object_add(tfile, &user_bo->prime.base,
TTM_REF_USAGE, NULL);
TTM_REF_USAGE, NULL, false);
}
/*

22
drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
View File

@ -891,17 +891,16 @@ vmw_surface_handle_reference(struct vmw_private *dev_priv,
uint32_t handle;
struct ttm_base_object *base;
int ret;
bool require_exist = false;
if (handle_type == DRM_VMW_HANDLE_PRIME) {
ret = ttm_prime_fd_to_handle(tfile, u_handle, &handle);
if (unlikely(ret != 0))
return ret;
} else {
if (unlikely(drm_is_render_client(file_priv))) {
DRM_ERROR("Render client refused legacy "
"surface reference.\n");
return -EACCES;
}
if (unlikely(drm_is_render_client(file_priv)))
require_exist = true;
if (ACCESS_ONCE(vmw_fpriv(file_priv)->locked_master)) {
DRM_ERROR("Locked master refused legacy "
"surface reference.\n");
@ -929,17 +928,14 @@ vmw_surface_handle_reference(struct vmw_private *dev_priv,
/*
* Make sure the surface creator has the same
* authenticating master.
* authenticating master, or is already registered with us.
*/
if (drm_is_primary_client(file_priv) &&
user_srf->master != file_priv->master) {
DRM_ERROR("Trying to reference surface outside of"
" master domain.\n");
ret = -EACCES;
goto out_bad_resource;
}
user_srf->master != file_priv->master)
require_exist = true;
ret = ttm_ref_object_add(tfile, base, TTM_REF_USAGE, NULL);
ret = ttm_ref_object_add(tfile, base, TTM_REF_USAGE, NULL,
require_exist);
if (unlikely(ret != 0)) {
DRM_ERROR("Could not add a reference to a surface.\n");
goto out_bad_resource;

5
include/drm/ttm/ttm_object.h
View File

@ -229,6 +229,8 @@ extern void ttm_base_object_unref(struct ttm_base_object **p_base);
* @ref_type: The type of reference.
* @existed: Upon completion, indicates that an identical reference object
* already existed, and the refcount was upped on that object instead.
* @require_existed: Fail with -EPERM if an identical ref object didn't
* already exist.
*
* Checks that the base object is shareable and adds a ref object to it.
*
@ -243,7 +245,8 @@ extern void ttm_base_object_unref(struct ttm_base_object **p_base);
*/
extern int ttm_ref_object_add(struct ttm_object_file *tfile,
struct ttm_base_object *base,
enum ttm_ref_type ref_type, bool *existed);
enum ttm_ref_type ref_type, bool *existed,
bool require_existed);
extern bool ttm_ref_object_exists(struct ttm_object_file *tfile,
struct ttm_base_object *base);