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| author | Thomas Hellstrom <thellstrom@vmware.com> | 2015-08-27 20:06:24 +0300 |
|---|---|---|
| committer | Thomas Hellstrom <thellstrom@vmware.com> | 2015-09-01 12:06:02 +0300 |
| commit | aa3469ce7afd86a670d22375a64f1b5a06707725 (patch) | |
| tree | f36aae88ccb3d764e8ecd4e1e168fcd00ff0e43b /drivers/gpu/drm/vmwgfx | |
| parent | 36d4e87b497d9cb3bf8e1bb2f803c7aa41dfb463 (diff) | |
| download | linux-aa3469ce7afd86a670d22375a64f1b5a06707725.tar.xz | |
drm/vmwgfx: Allow dropped masters render-node like access on legacy nodes v2
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>
Diffstat (limited to 'drivers/gpu/drm/vmwgfx')
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 7 | ||||
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 6 |
2 files changed, 12 insertions, 1 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c index 03854d606d58..e13b20bd9908 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c @@ -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); diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c index 5b8595b78429..3361769842f4 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c @@ -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; } |