rune/libenclave/skeleton: Support OOT driver in PAL API V2

Signed-off-by: NYilin Li <YiLin.Li@linux.alibaba.com>

rune/libenclave/internal/runtime/pal/skeleton/liberpal-skeleton-v2.c

@@ -13,11 +13,6 @@ int pal_get_version(void)
 
 int pal_init(pal_attr_t *attr)
 {
-	if (is_oot_driver) {
-		fprintf(stderr, "Skeleton PAL API v2 doesn't support SGX OOT driver!\n");
-		return -1;
-	}
-
 	return __pal_init(attr);
 }
 

rune/libenclave/internal/runtime/pal/skeleton/liberpal-skeleton.c

@@ -35,6 +35,7 @@
 static struct sgx_secs secs;
 static pal_stdio_fds pal_stdio;
 static bool initialized = false;
+static int exit_code;
 static char *sgx_dev_path;
 static bool no_sgx_flc = false;
 static bool enclave_debug = true;
@@ -486,6 +487,13 @@ int __pal_create_process(pal_create_process_args *args)
 		return -1;
 	}
 
+	/* SGX out-of-tree driver disallows the creation of shared enclave mapping
+	 * between parent and child process, so simply launching __pal_exec() directly here.
+	 */
+	if (is_oot_driver) {
+		return __pal_exec(args->path, args->argv, args->stdio, &exit_code);
+	}
+
 	FILE *fp = fdopen(args->stdio->stderr, "w");
 	if (!fp)
 		return -1;
@@ -524,6 +532,11 @@ int wait4child(pal_exec_args *attr)
 		return -1;
 	}
 
+	if (is_oot_driver) {
+		*attr->exit_value = exit_code;
+		return exit_code;
+	}
+
 	waitpid(attr->pid, &status, 0);
 
 	if (WIFEXITED(status) || WIFSIGNALED(status))