From: Keir Fraser <keir.fraser@citrix.com>
Date: Mon, 12 May 2008 09:10:45 +0000 (+0100)
Subject: minios: clear FB content since _xmalloc may return non-zeroed memory
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14215^2~34
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=a58e7325d68a0b6fc156ef849ab8174d1978ca2d;p=xen.git

minios: clear FB content since _xmalloc may return non-zeroed memory
(in debug mode, notably).

Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
---

diff --git a/extras/mini-os/kernel.c b/extras/mini-os/kernel.c
index 662acb0b00..ea92adca6a 100644
--- a/extras/mini-os/kernel.c
+++ b/extras/mini-os/kernel.c
@@ -303,13 +303,10 @@ static void fbfront_thread(void *p)
 
     memsize = n * PAGE_SIZE;
     fb = _xmalloc(memsize, PAGE_SIZE);
+    memset(fb, 0, memsize);
     mfns = xmalloc_array(unsigned long, n);
-    for (i = 0; i < n; i++) {
-        /* trigger CoW */
-        ((char *) fb) [i * PAGE_SIZE] = 0;
-        barrier();
+    for (i = 0; i < n; i++)
         mfns[i] = virtual_to_mfn((char *) fb + i * PAGE_SIZE);
-    }
     fb_dev = init_fbfront(NULL, mfns, WIDTH, HEIGHT, DEPTH, line_length, n);
     xfree(mfns);
     if (!fb_dev) {