From: MikeCAT <mikecat@users.noreply.github.com>
Date: Sat, 19 Dec 2015 14:43:56 +0000 (+0900)
Subject: add alignment check of virtual address to exec()
X-Git-Url: https://git.devinivas.org/?a=commitdiff_plain;h=67a7f9597e187dad3dfd9732461fec2de6edbba1;p=cs3210-lab1.git

add alignment check of virtual address to exec()
---

diff --git a/exec.c b/exec.c
index 8dbbdb6..e5d1816 100644
--- a/exec.c
+++ b/exec.c
@@ -46,6 +46,8 @@ exec(char *path, char **argv)
       goto bad;
     if((sz = allocuvm(pgdir, sz, ph.vaddr + ph.memsz)) == 0)
       goto bad;
+    if(ph.vaddr % PGSIZE != 0)
+      goto bad;
     if(loaduvm(pgdir, (char*)ph.vaddr, ip, ph.off, ph.filesz) < 0)
       goto bad;
   }