From: Takashi Iwai <tiwai@suse.de>
Subject: nouveau: Suppress sysfs bind
Patch-mainline: Never, SLE-specific workaround
References: CVE-2020-27820 bsc#1179599

As of this kernel branch, the dynamic bind/unbind of Nouveau DRM
driver may lead to use-after-free.  Although the upstream kernel
papered over the bug, it's pretty much difficult to backport the fixes
to the old kernels, especially without breaking kABI.

As an alternative workaround, this patch just disables the dynamic
bind/unbind via sysfs for nouveau driver, instead.  The feature
shouldn't be used for this driver on the supported products, in
anyway.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/nouveau/nouveau_drm.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -1064,6 +1064,7 @@ nouveau_drm_pci_driver = {
 	.probe = nouveau_drm_probe,
 	.remove = nouveau_drm_remove,
 	.driver.pm = &nouveau_pm_ops,
+	.driver.suppress_bind_attrs = true,
 };
 
 struct drm_device *