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render/allocator: use legacy authentication for primary nodes 

Closes: https://github.com/swaywm/wlroots/issues/3156
This commit is contained in:
Simon Ser 2021-09-03 10:03:27 +02:00 committed by Simon Zeni
parent 00c2bae1d3
commit 7df2ae88fa
1 changed files with 23 additions and 0 deletions
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23
render/allocator/allocator.c
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@ -35,8 +35,31 @@ static int reopen_drm_node(int drm_fd) {
int new_fd = open(name, O_RDWR | O_CLOEXEC);
if (new_fd < 0) {
wlr_log_errno(WLR_ERROR, "Failed to open DRM node '%s'", name);
free(name);
return -1;
}
free(name);
// If we're using a DRM primary node (e.g. because we're running under the
// DRM backend, or because we're on split render/display machine), we need
// to use the legacy DRM authentication mechanism to have the permission to
// manipulate buffers.
if (drmGetNodeTypeFromFd(new_fd) == DRM_NODE_PRIMARY) {
drm_magic_t magic;
if (drmGetMagic(new_fd, &magic) < 0) {
wlr_log_errno(WLR_ERROR, "drmGetMagic failed");
close(new_fd);
return -1;
}
if (drmAuthMagic(drm_fd, magic) < 0) {
wlr_log_errno(WLR_ERROR, "drmAuthMagic failed");
close(new_fd);
return -1;
}
}
return new_fd;
}