From 68a4e0ce507ba6975d34b7a4cdf877e4ca509f89 Mon Sep 17 00:00:00 2001
From: "K. Lange" <klange@toaruos.org>
Date: Sun, 12 Aug 2018 18:16:44 +0900
Subject: [PATCH] Require exec permission to exec (finally)

---
 kernel/misc/elf.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/misc/elf.c b/kernel/misc/elf.c
index fcb79ac8..11f359f0 100644
--- a/kernel/misc/elf.c
+++ b/kernel/misc/elf.c
@@ -274,6 +274,10 @@ int exec(
 		return -ENOENT;
 	}
 
+	if (!has_permission(file, 01)) {
+		return -EACCES;
+	}
+
 	/* Read four bytes of the file */
 	unsigned char head[4];
 	read_fs(file, 0, 4, head);