module: Call security_kernel_post_load_data()

Now that there is an API for checking loaded contents for modules
loaded without a file, call into the LSM hooks.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: KP Singh <kpsingh@google.com>
Acked-by: Jessica Yu <jeyu@kernel.org>
Link: https://lore.kernel.org/r/20201002173828.2099543-11-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: kees

kernel/module.c

@@ -3014,7 +3014,7 @@ static int copy_module_from_user(const void __user *umod, unsigned long len,
 	if (info->len < sizeof(*(info->hdr)))
 		return -ENOEXEC;
 
-	err = security_kernel_load_data(LOADING_MODULE, false);
+	err = security_kernel_load_data(LOADING_MODULE, true);
 	if (err)
 		return err;
 
@@ -3024,11 +3024,17 @@ static int copy_module_from_user(const void __user *umod, unsigned long len,
 		return -ENOMEM;
 
 	if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) {
-		vfree(info->hdr);
-		return -EFAULT;
+		err = -EFAULT;
+		goto out;
 	}
 
-	return 0;
+	err = security_kernel_post_load_data((char *)info->hdr, info->len,
+					     LOADING_MODULE, "init_module");
+out:
+	if (err)
+		vfree(info->hdr);
+
+	return err;
 }
 
 static void free_copy(struct load_info *info)