From: David van Moolenbroek <david@minix3.org>
Date: Fri, 4 Sep 2015 01:19:59 +0000 (+0200)
Subject: VM: align frame buffer
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/static/doc/zpipe.c?a=commitdiff_plain;h=65c4b82f0262b0bf819c385fc9d0b36740f674ea;p=minix.git

VM: align frame buffer

Lack of alignment causes minix_stack_fill to produce an incorrect
frame layout, subsequently resulting in a crash of the started
process.  For now, we assume that the other callers of
minix_stack_fill do get an aligned buffer through sbrk(3), but this
may have to be changed later as well.

Change-Id: I1575bd62b050749d1a1aae7417310c91713462c3
---

diff --git a/minix/servers/vm/main.c b/minix/servers/vm/main.c
index 884fb43e1..9f939da8c 100644
--- a/minix/servers/vm/main.c
+++ b/minix/servers/vm/main.c
@@ -346,7 +346,7 @@ static void exec_bootproc(struct vmproc *vmp, struct boot_image *ip)
 	char *argv[] = { ip->proc_name, NULL };
 	char *envp[] = { NULL };
 	char *path = ip->proc_name;
-	char frame[VM_PAGE_SIZE];
+	char frame[VM_PAGE_SIZE] __aligned(sizeof(void *));
 
 	memset(&vmexeci, 0, sizeof(vmexeci));