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render/drm_dumb_allocator: check for DRM master 

If we aren't the DRM master, allocating dumb buffers will fail with
EPERM.
This commit is contained in:
Simon Ser 2021-05-31 21:39:37 +02:00 committed by Simon Zeni
parent 6605d7c390
commit 5c30cf3d94
1 changed files with 5 additions and 0 deletions
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5
render/drm_dumb_allocator.c
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@ -195,6 +195,11 @@ static const struct wlr_allocator_interface allocator_impl = {
}; };
struct wlr_allocator *wlr_drm_dumb_allocator_create(int fd) { struct wlr_allocator *wlr_drm_dumb_allocator_create(int fd) {
if (!drmIsMaster(fd)) {
wlr_log(WLR_ERROR, "Cannot use DRM dumb buffers with non-master DRM FD");
return NULL;
}
/* Re-open the DRM node to avoid GEM handle ref'counting issues. See: /* Re-open the DRM node to avoid GEM handle ref'counting issues. See:
* https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/110 * https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/110
* TODO: don't assume we have the permission to just open the DRM node, * TODO: don't assume we have the permission to just open the DRM node,