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drm/vmwgfx: Allow dropped masters render-node like access on legacy nodes v2

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Applications like gnome-shell may try to render after dropping master
privileges. Since the driver should now be safe against this scenario,
allow those applications to use their legacy node like a render node.

v2: Add missing return statement.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
This commit is contained in:
Thomas Hellstrom 2015-08-27 10:06:24 -07:00
parent 36d4e87b49
commit aa3469ce7a
2 changed files with 12 additions and 1 deletions
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7
drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
View file

@ -1052,10 +1052,15 @@ static struct vmw_master *vmw_master_check(struct drm_device *dev,
}
/*
* Check if we were previously master, but now dropped.
* Check if we were previously master, but now dropped. In that
* case, allow at least render node functionality.
*/
if (vmw_fp->locked_master) {
mutex_unlock(&dev->master_mutex);
if (flags & DRM_RENDER_ALLOW)
return NULL;
DRM_ERROR("Dropped master trying to access ioctl that "
"requires authentication.\n");
return ERR_PTR(-EACCES);

6
drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
View file

@ -911,6 +911,12 @@ vmw_surface_handle_reference(struct vmw_private *dev_priv,
"surface reference.\n");
return -EACCES;
}
if (ACCESS_ONCE(vmw_fpriv(file_priv)->locked_master)) {
DRM_ERROR("Locked master refused legacy "
"surface reference.\n");
return -EACCES;
}
handle = u_handle;
}