[PATCH v3 5/8] selinux: Restrict cross-cgroup dma-buf charging

@@ -2204,6 +2204,12 @@ static int selinux_capable(const struct cred *cred, struct user_namespace *ns,
 	return cred_has_capability(cred, cap, opts, ns == &init_user_ns);
 }
 
+static int selinux_dma_buf_charge_task(const struct cred *from, const struct cred *to)
+{
+	return avc_has_perm(cred_sid(from), cred_sid(to),
+			    SECCLASS_DMA_BUF, DMA_BUF__CHARGE_TASK, NULL);
+}
+
 static int selinux_quotactl(int cmds, int type, int id, const struct super_block *sb)
 {
 	const struct cred *cred = current_cred();

@@ -7674,6 +7680,7 @@ static struct security_hook_list selinux_hooks[] __ro_after_init = {
 	LSM_HOOK_INIT(capget, selinux_capget),
 	LSM_HOOK_INIT(capset, selinux_capset),
 	LSM_HOOK_INIT(capable, selinux_capable),
+	LSM_HOOK_INIT(dma_buf_charge_task, selinux_dma_buf_charge_task),
 	LSM_HOOK_INIT(quotactl, selinux_quotactl),
 	LSM_HOOK_INIT(quota_on, selinux_quota_on),
 	LSM_HOOK_INIT(syslog, selinux_syslog),

@@ -181,6 +181,7 @@ const struct security_class_mapping secclass_map[] = {
 	{ "user_namespace", { "create", NULL } },
 	{ "memfd_file",
 	  { COMMON_FILE_PERMS, "execute_no_trans", "entrypoint", NULL } },
+	{ "dma_buf", { "charge_task", NULL } },
 	/* last one */ { NULL, {} }
 };