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From f583672221b8451d03f739bc96428e97809d021a Mon Sep 17 00:00:00 2001
From: Damian Hobson-Garcia <dhobsong@igel.co.jp>
Date: Tue, 5 Apr 2022 18:09:02 +0900
Subject: [PATCH] Workaround: Disable DRM_AUTH check on wayland protocols
DRM authentication does not work via a DRM Leases because the client
can only authenticate against a lease owner (primary node), since
the lease does not have a corresponding device file in the filesystem
for clients to open.
The wl_drm protocol needs authentication to import/export prime fds
on kernel versions < 5.6. For newer kernel versions, prime
import/export no longer requires DRM_AUTH, so processing can proceed
even if DRM authentication fails.
A proper implementation would check if the device is actually a
DRM lease and/or whether the import/export can succeed without
authentication. For now, just try to authenticate and ignore
any failures.
---
src/egl/drivers/dri2/platform_drm.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/egl/drivers/dri2/platform_drm.c b/src/egl/drivers/dri2/platform_drm.c
index d0ab172..260a2c6 100644
--- a/src/egl/drivers/dri2/platform_drm.c
+++ b/src/egl/drivers/dri2/platform_drm.c
@@ -508,7 +508,10 @@ dri2_drm_authenticate(_EGLDisplay *disp, uint32_t id)
{
struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
- return drmAuthMagic(dri2_dpy->fd, id);
+ /* WORKAROUND: Ignore DRM_AUTH failures. Ideally should only be done for
+ clienits coming through a DRM lease, but just make it global for now */
+ drmAuthMagic(dri2_dpy->fd, id);
+ return 0;
}
static void
--
2.17.1
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