From b1d41d678888fd1a51e4844ab583f7c47f9fb218 Mon Sep 17 00:00:00 2001
From: Austin Clements <amdragon@mit.edu>
Date: Wed, 1 Sep 2010 16:46:37 -0400
Subject: Remove the stack guard page.  Processes are now contiguous from 0 to
 proc->sz, which means our syscall argument validation is correct.  Add a
 pointer validation test and remove the stack test, which tested for the guard
 page.

---
 exec.c | 1 -
 1 file changed, 1 deletion(-)

(limited to 'exec.c')

diff --git a/exec.c b/exec.c
index 39530aa..c518c04 100644
--- a/exec.c
+++ b/exec.c
@@ -52,7 +52,6 @@ exec(char *path, char **argv)
 
   // Allocate and initialize stack at sz
   sz = PGROUNDUP(sz);
-  sz += PGSIZE; // leave an invalid page
   if(!allocuvm(pgdir, (char *)sz, PGSIZE))
     goto bad;
   mem = uva2ka(pgdir, (char *)sz);
-- 
cgit v1.2.3