1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/exec.c b/kernel/exec.c
index b21afbb..c25dfb0 100644
--- a/kernel/exec.c
+++ b/kernel/exec.c
@@ -68,6 +68,7 @@ exec(char *path, char **argv)
   sz = PGROUNDUP(sz);
   if((sz = uvmalloc(pagetable, sz, sz + 2*PGSIZE)) == 0)
     goto bad;
+  clearpteu(pagetable, sz-2*PGSIZE);
   sp = sz;
   stackbase = sp - PGSIZE;